Datasheet saa7284 DATASHEETS (Philips)

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INTEGRATED CIRCUITS

DATA SH EET

SAA7284

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

Preliminary speciﬁcation File under Integrated Circuits, IC02

1996 Oct 24

Page 2

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

FEATURES

• Single-chip solution including FM and vision filters, analog demodulator and audio switching

• Dual standard with automatic selection between PAL system I and BGH

• Suitable for conventional intercarrier PLL-IF (single SAW) TV/VCR systems

• Single low-radiation crystal oscillator for improved EMC

• Stereo bitstream audio DACs

• Programmable attenuator for matching levels of NICAM

and FM audio sources at the output of the device

• Full EBU specification NICAM 728 demodulation and decoding

• Digital Audio Interface conforming with EBU/IEC 958

• Automatic mute function which switches from NICAM to

FM sound when NICAM fails

• Compatible with either single-ended or differential DQPSK input signals

• Microcomputer controlled via I2C-bus (up to 400 kHz specification).

APPLICATIONS

• Television receivers

• Video cassette recorders.

The SAA7284 takes, as input, a second IF (intercarrier) Terrestrial TV PAL signal, and performs all the Differential Quadrature Phase Shift Keying (DQPSK) demodulation, digital decoding and digital-to-analog conversion necessary to produce a complete NICAM receiver on a single integrated circuit.

The demodulator function includes integrated baseband filters for pulse shaping and unwanted signal rejection, automatic gain control, a low jitter integrated VCO, digital monostables for precise data sampling points and a multi-standard controller to enable automatic locking to either a PAL system I or PAL system BGH input signal.

The decoder function performs the descrambling, de-interleaving and reformatting operations required to recover the original data words.

The data words are processed through a stereo digital filter, digital de-emphasis network, second order noise shaper and 256 times oversampling Bitstream audio DAC.

SAA7284

GENERAL DESCRIPTION

Philips Semiconductors have pushed the boundaries of Stereo Sound further with this addition to the successful Terrestrial Digital Sound Decoder family. The SAA7284 device is an application specific version of the existing SAA7283, with guaranteed improved specification on selected parameters, enabling comparable RF performance in conventional intercarrier PLL-IF systems, to that of the SAA7283 in QSS systems.

ORDERING INFORMATION

TYPE

NUMBER

SAA7284ZP SDIP52 plastic shrink dual in-line package; 52 leads (600 mil) SOT247-1 SAA7284GP QFP64 plastic quad ﬂat package; 64 leads (lead length 1.95 mm);

1996 Oct 24 2

NAME DESCRIPTION VERSION

body 14 × 20 × 2.8 mm

PACKAGE

SOT319-2

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

clk

amb

supply voltage 4.5 5.0 5.5 V supply current − 205 − mA clock frequency − 8.192 − MHz operating ambient temperature −20 +25 +70 °C

SAA7284

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

BLOCK DIAGRAM

handbook, full pagewidth

DDF1

SSF1

COFF CEYE

DDF2

SSF2

REMO

REMVE

REF

ROF

RCF

CLKLPF

DATAOUT

DATAIN

XTAL

OSC

SSX

SDA

SCL

ADSEL

25 23

30 31

38 39

17 16

36 35

37 41

46 45

42 43

44 54

53 55

PHASE DETECTOR

AND DATA SLICERS

OSCILLATOR

DQPSK MIXREF

29 28

QUADRATURE MIXERS, BASEBAND FILTERS

AGC GAIN STAGE

COSINE

CARRIER LOOP

BITRATE

CLOCK

RECOVERY

CRYSTAL

I C

AND

SINE

AGC

CONTROLLER

CARRIER LOOP

QUADRATURE

VCO

NICAM 728 DECODER

AND

DEVICE CONTROLLER

SAA7284

SOFF

SEYE

PKDET

VCONT

VCLK

PCLK

RESET

PORT2

MUTE

PORM

PORA

DOBM

V V

SSDAC

EXTL

V V

(1) Represents controller bus.

DDD SSD

FML

DDA

SSA ROA RCA

SAA7284GP

49 48

12 13

61 62 7 63

DAI

NOISE SHAPER

(LEFT CHANNEL)

BITSTREAM DAC (LEFT CHANNEL)

OUTPUT

SWITCHES

AND

BUFFER

(LEFT CHANNEL)

11 4

OPL

DIGITAL FILTER, GAIN,

J17 DE-EMPHASIS

NOISE SHAPER

(RIGHT CHANNEL)

BITSTREAM DAC

(RIGHT CHANNEL)

(1)

OUTPUT

SWITCHES

AND

BUFFER

(RIGHT CHANNEL)

OPR

MBH216

FMR

EXTR

Fig.1 Block diagram (QFP64).

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

PINNING

SYMBOL

SDIP52 QFP64

MUTE 1 57 active LOW mute input; function deﬁned by MUTEDEF (control bit in the

DOBM 2 59 digital audio interface output that can be 3-stated via I V

DDA

SSA

RCA

EXTR 6 2 external analog input to the right audio channel FMR 7 3 FM sound input to the right audio channel OPR 8 4 analog output from the right audio channel n.c. 9 and 10 9 and 10 not connected; left open-circuit in application V

ROA

SSDAC

n.c. 13 and 14 − not connected; left open-circuit in application OPL 15 11 analog output from the left audio channel FML 16 12 FM sound input to the left audio channel EXTL 17 13 external analog input to the left audio channel PORM 18 14 active LOW power-on reset mute input; mute cleared by setting silence bit

PORA 19 15 power-on reset audio select input (internal pull-up) REMVE 20 16 carrier loop-ﬁlter connection REMO 21 17 carrier loop-ﬁlter output SEYE 22 21 sine channel eye pattern output for monitoring SOFF 23 22 sine channel offset compensator capacitor output V

SSF1

VCLK 25 24 carrier loop VCO clock output for monitoring V

DDF1

VCONT 27 27 carrier loop VCO control voltage input MIXREF 28 28 mixer voltage reference or input when using differential DQPSK signal DQPSK 29 29 DQPSK input signal COFF 30 30 cosine channel offset compensator capacitor output CEYE 31 31 cosine channel eye pattern output for monitoring PKDET 32 34 AGC peak detector storage capacitor output V

ROF

REF

RCF

DDF2

SSF2

n.c. 38 40 not connected; left open-circuit in application CLKLPF 39 41 clock loop-phase comparator output

(1)

DESCRIPTION

I2C-bus register)

C-bus 3 61 analog supply voltage for the audio channels 4 62 analog ground connection for the audio channels 5 63 internal audio reference voltage buffer (high-impedance node)

11 7 internal audio reference voltage buffer output 12 8 quiet ground connection to DACs

HIGH in I2C-bus (internal pull-up)

24 23 demodulator ground connection 1

26 25 demodulator supply voltage 1

33 35 internal demodulator reference voltage buffered output 34 36 internal demodulator reference current output 35 37 internal demodulator reference voltage unbuffered output 36 38 demodulator supply voltage 2 37 39 demodulator ground connection 2

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL

SDIP52 QFP64

XTAL 40 42 8.192 MHz crystal oscillator input OSC 41 43 8.192 MHz crystal oscillator output V

SSX

DATAIN 43 45 serial data input at 728 kbits/s to decoder V

SSD

PCLK 45 47 728 kHz output clock to DQPSK demodulator V

DDD

RESET 47 50 active LOW power-on reset input DATAOUT 48 46 serial data output at 728 kbits/s from DQPSK demodulator SCL 49 53 serial clock input for I SDA 50 54 serial data input/output for I ADSEL 51 55 input that deﬁnes I PORT2 52 56 output that is directly controlled from Port 2 bit in I

Note

1. Pins 1, 5, 6, 18, 19, 20, 26, 32, 33, 51, 52, 58, 60 and 64 are not connected; left open-circuit in application.

(1)

DESCRIPTION

42 44 crystal oscillator ground connection

44 48 digital ground connection

46 49 digital supply voltage

C-bus

C-bus address bit 0 (internal pull-up)

C-bus

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Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

handbook, halfpage

SSDAC

REMVE

MUTE

DDA

SSA

RCA

EXTR

FMR

OPR

n.c.

ROA

n.c.

13 40

n.c.

OPL

FML

EXTL

17 18

PORM PORA

19 20

SAA7284ZP

52 51 50 49 48 47 46 45 44 43 42 41

39 38 37 36 35

34 33

PORT2 ADSELDOBM SDA SCL DATAOUT RESET

DDD

PCLK V

SSD DATAIN V

SSX OSC

XTAL

CLKLPF n.c. V

SSF2 V

DDF2 V

RCF I

REF

ROF PKDETREMO

SAA7284

22 23

SSF1

DDF1

Fig.2 Pin configuration for SOT247.

1996 Oct 24 7

MBH217

30 29 28 27

CEYESEYE COFFSOFF DQPSK MIXREFVCLK VCONT

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

handbook, full pagewidth

EXTR

SSDAC

n.c.

FMR OPR

n.c. n.c.

ROA

n.c.

64 1 2 3 4 5 6 7 8 9

RCA

SSA

DDA

n.c. 60

DOBM 59

n.c.

MUTE

PORT2 56

ADSEL

SDA 54

SCL

n.c.

51 50 49 48 47 46 45 44 43

n.c.

RESET V

DDD

SSD

PCLK DATAOUT DATAIN

SSX

OSC

SAA7284

n.c. OPL FML

EXTL PORM PORA

REMVE

REMO

n.c. n.c.

10 11 12 13 14 15 16 17 18 19

n.c.

SEYE

SOFF

SSF1

SAA7284GP

DDF1

VCLK

n.c.

VCONT

DQPSK

MIXREF

COFF

CEYE

n.c.

42 41 40 39 38 37 36 35 34 33

XTAL CLKLPF n.c. V

SSF2

DDF2

RCF

REF

ROF

PKDET

n.c.

MBH218

Fig.3 Pin configuration for SOT319.

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

FUNCTIONAL DESCRIPTION DQPSK demodulation

UADRATURE MIXERS, BASEBAND FILTERS AND AUTOMATIC

GAIN CONTROL

The DQPSK signal is fed into two differential input mixers, where it is mixed with quadrature phases generated by the carrier-loop quadrature VCO. The quadrature signals modulated onto the NICAM carrier are thus recovered.

The mixers can be driven by either a single-ended or differential source. In single-ended mode, the device is driven directly from the sound IF down-converter into the DQPSK input pin, with the MIXREF pin decoupled. In differential mode, the signal is applied between the DQPSK and MIXREF pins.

The outputs from the mixers are then fed into a pulse-shaping filter, and FM/vision filter stage with improved colour rejection to allow suitable performance with SAW filters. The signal from the filtering stages is then fed into the AGC, which ensures that the phase comparator gain remains constant, irrespective of the input signal level. This is important to maintain the stability of Costas loop PLL.

AGC

CONTROLLER

The AGC controller monitors the I and Q channel signals at the input to the carrier loop-phase comparator and generates a reference voltage to set the AGC output level.

YE BUFFER

A differential to the single-ended converter provides the baseband signal as an output at the pins CEYE and SEYE for the I and Q channels respectively for eye-height monitoring.

IT RATE CLOCK RECOVERY

B The I and Q channels are processed using edge detectors

and monostables, which generate a signal with a coherent component at the data symbol rate. The outputs from the I and Q channel monostables are each compared with the clock derived from PCLK (364 kHz nominal), the resultant output is used to derive a 3-state control signal used to control two current sources at the CLKLPF output. This error signal is loop filtered and used to control the master clock oscillator. The bit rate clock, PCLK, and symbol clock are derived from the master clock.

(AGC)

SAA7284

NICAM 728 decoding

ECODING FUNCTIONS

D The device performs all decoding functions in accordance

with the EBU NICAM 728 specification. After locking to the frame alignment word, the data is de-scrambled by application of the defined pseudo random binary sequence, and the device synchronizes to the periodic frame flag bit C0.

The relevant control information and scale factor word is extracted, and with the integrated RAM the data is de-interleaved and the scale factor word is extracted, and expanded to 14 bits. Parity checking on the eleventh bit of each sample word is carried out to reveal any sound sample errors, which if detected are flagged, with the last good sample being held.

Automatic muting

Enable when AMDIS = LOW. The I registers which define an upper and lower limit for the automatic muting function. When the number of errors within a 128 ms period exceeds the number stored in the upper error limit register, then the automatic muting will switch the device output to the FM input, (dependent on the relevant control bits in the I2C-bus) and mute (set to zero) the data input to the filter (in that order). When the error count in a 128 ms period is less than the value stored in the lower error limit register then the data into the filter is uninterrupted, and the device output is switched back to the DAC (dependent on the value of the relevant control bits in the I2C-bus). During the muting operation the open-drain pin MUTE is pulled LOW and the AM bit in the status-byte is set HIGH. Figure 4 shows the dependency of the automatic muting function on error_count, RSSF, C4OV, output state and application mode. The automatic muting function, if enabled, will override user mute via the MUTE pin/bit.

When the transmission is DATA format or currently undefined format (C3 = logic 1) the device will automatically switch to the FM inputs regardless of RSSF/C4OV states, and whether the automatic muting function AMDIS is enabled or disabled.

C-bus section has two

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

User mute

The error counter is an 8-bit counter which locks at count 255. The counter is reset and its output sent to the I2C-bus every 128 ms. This enables the user to interrogate the number of errors occurring within a 128 ms period. The user can then mute the device by pulling pin MUTE LOW (this function is also provided by the MUTE bit in the I2C-bus) or setting SILENCE bit LOW in I2C-bus to switch input of audio switching buffers to analog ground.

Switching buffers

The analog switches select between the output of the DACs, the FM input and an external input (EXT). Switching is controlled by bits in the I switching function. The external analog inputs should be ≤1.1 V (RMS) at the input pin, and the output buffers have a voltage drive of 1 V (RMS).

NICAM/FM audio level matching

C-bus and internal

SAA7284

Power-on reset state

Two pins control the initial set-up of the device during power-on reset.

PORA (Power-On Reset Audio)

When pulled LOW the device will be configured with a 12 dB gain in the oversampling filter and theC4OV bit in the I2C-bus will be set HIGH. This pin when HIGH will configure the device with a 6 dB gain in the oversampling filter and will set C4OV bit in the I2C-bus LOW.

PORM (Power-On Reset Mute)

This pin when LOW will mute the output of the device at power-on by setting the SILENCE bit in the I2C-bus LOW. To put the device back into a normal mode of operation the SILENCE bit in the I2C-bus must be set HIGH.

Differing audio headroom and alignment levels occur between systems I and BGH, due to the differing systems and broadcast standards. In order to match the NICAM and FM audio output levels without requiring application changes, the device will automatically switch in 4.6 dB attenuation network in the NICAM path for system BGH (this can be disabled by setting the NICLEV bit LOW in

C-bus). A programmable attenuation network in the FM

I path only, controlled by bits in I2C-bus, provides additional flexibility for user to match FM and NICAM audio levels (see Table 9).

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

handbook, full pagewidth

MUTEB pin = HIGH

AM bit = LOW

C4ov BIT = 0

ERROR_COUNT

ERROR_MAX

YES

RSSF = 1

Output is

unchanged

YESYES

Output is

unchanged

AM bit = LOW

MUTEB pin = HIGH

SAA7284

EXT or FM INPUT

SWITCHED IN

SOUND APPLICATION

DUAL MONO

Output is switched

to FM input

AM bit = HIGH

MUTEB pin = LOW

YES

Output is

unchanged

AM bit = HIGH

MUTEB pin = LOW

DUAL MONO MODE LEFT = RIGHT = M1

SELECTED

YES

When error_count is less than error_min, the output is switched back to NICAM and AM bit = LOW, MUTEB pin = HIGH

When error_count is less than error_min, AM bit = LOW,

(1)

MUTEB pin = HIGH

Output is

unchanged

AM bit = LOW

MUTEB pin = HIGH

MGB465

(1) Indicating that a mute may occur when user returns to NICAM source.

Fig.4 Flow diagram showing SAA7284 automatic muting function.

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

I2C-BUS FORMATS

The SAA7284 contains an I2C-bus slave transceiver (up to 400 kHz) permitting a master device to:

• Read decoder status information derived from the transmitted digital audio signal

• Read an error count byte to determine the bit error rate for user mute purposes and to indicate quality of NICAM signal

• Write control codes to select PAL I or PAL BGH configurations

• Write control codes to select the available analog switching configurations

• Write upper and lower error count limits for automatic muting function

• Read additional transmitted data bits. Their purpose has yet to be defined but accessibility is provided to allow future

services to be implemented in receiver software.

C-bus slave address

An address select pin (ADSEL) is provided to allow selection of one of two different slave addresses. The logic state of the ADSEL pin is reflected in the least significant bit of the I2C-bus slave address.

Slave address = 101101X (R/W) [ADSEL = 1, address = B6 (R/W) ADSEL = 0, address = B4 (R/W)].

Table 1 SAA7284 slave address

BITS

A7 A6 A5 A4 A3 A2 A1 A0

1 0 1 1 0 1 selected by ADSEL read/write

The SAA7284 does not acknowledge the I2C-bus general call address.

Slave receiver format

The slave receiver format is shown in Table 2.

Table 2 Slave receiver format

START slave_addr ACK sub_addr ACK data_byte ACK n-bytes data_byte ACK STOP

Table 3 Explanation of Table 2

ITEM DESCRIPTION

START I Slave_addr 101101XW X logic 0 when ADSEL = 0; logic 1 when ADSEL = 1 W logic 0, I ACK I Sub_addr sub-address range 00 to 04 (HEX) Data_byte data byte transmitted to slave receiver STOP I

C-bus start condition

C-bus write to slave receiver

C-bus acknowledge condition generated by slave receiver

C-bus stop condition

The sub-address is auto-incremented by the SAA7284, for each data byte received. When the sub-address is equal to 04 (HEX), on reception of the next data byte, the sub-address will reset to 00 (HEX).

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

I2C-bus slave receiver register map Table 4 Slave receiver data byte

SUB-ADDRESS D7 D6 D5 D4 D3 D2 D1 D0

000 M1/ 001 EMAX7 EMAX6 EMAX5 EMAX4 EMAX3 EMAX2 EMAX1 EMAX0 010 EMIN7 EMIN6 EMIN5 EMIN4 EMIN3 EMIN2 EMIN1 EMIN0 011 100 ASYS BG/

M1/M2 This bit selects either mono channel M1 or M2 to be the

output on the left and right channel dependent on the transmitted control bits C1 and C2 indicating a mono transmission and the value of bit DMSEL (see Table 5). Power-on resets to logic 1.

DMSEL DMSEL is the dual mono selection bit, for transmissions

consisting of two independent mono signals. Selection is in conjunction with M1/ to logic 0.

SSWIT1, SSWIT2 These bits control the analog switching, selecting between

the FM, external, and NICAM signals. With the NICAM source the signals select whether the de-emphasis is performed and what gain is applied after the filtering and de-emphasis stage. The signal states and their meaning are listed in Table 7. Power-on resets to 010 with PORA pin HIGH, and to 011 with PORA pin LOW.

PORT2 PORT2 controls a bit out, providing direct access to a

dedicated output pin (PORT2) via the I See Table 6. Power-on resets to logic 0.

MUTEDEF This defines the operation of the user definable

orMUTE I2C-bus bit when it is pulled LOW externally or set LOW in the I2C-bus respectively.

M2 DMSEL SSWIT3 SSWIT2 SSWIT1 PORT2 MUTEDEF AMDIS

C4OV MUTE SILENCE DAIE FM3 FM2 FM1 FM0

I NICLEV STLOCK −−−−

AMDIS This bit enables and disables the automatic mute function.

Power-on resets to enabled = LOW.

M2 (see Table 5). Power on resets

AND SSWIT3

C-bus.

MUTE pin

EMAX7 This is the upper error limit register which defines the

number of errors in 128 ms period which will cause automatic mute to switch IN. User definable, but power-on resets to 50 (HEX).

EMIN7 This is the lower error limit register which defines the

number of errors in 128 ms period which will cause automatic mute to switch OUT. User definable, but power-on resets to 14 (HEX).

C4OV When set LOW this bit overrides the status of the

transmitted C4-bit when muting. When this bit is HIGH muting takes place in accordance with EBU specification. Power-on resets to HIGH when the PORA pin is held LOW during power-up, and power-on resets to LOW when PORA is HIGH.

MUTE This reflects the function of the MUTEB pin. When this bit

is set LOW the external MUTEB pin is pulled LOW and the action is dependent on the MUTEDEF bit (see Table 8). Power-on resets to HIGH.

SILENCE

TO EMAX0

TO EMIN0

When this bit is HIGH, pulling the MUTE pin/I2C-bus bit LOW will mute (set to zero) the digital data and switch the output to the FM input, depending on relevant control bits (see Table 8). When this bit is LOW, pulling the MUTE pin/I2C-bus bit LOW will only mute the digital data under the same conditions. Power-on resets to LOW.

1996 Oct 24 13

When set LOW this bit silences the outputs of the device by switching the input of the audio switching buffers to analog ground. When the power-on reset the silence bit is initialized to zero. With PORM bit HIGH the silence bit is initialized HIGH.

PORM pin is held LOW at

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

DAIE When set HIGH this bit switches in the Digital Audio

Interface output to the DOBM pin. When set LOW the DOBM output is 3-stated. Power-on resets to HIGH.

TO FM0

FM3 These bits set the level of attenuation of the FM audio

signal (see Table 9). Power-on resets 0000 = 0 dB attenuation.

ASYS When this bit is HIGH it activates the automatic standard

switch mode. When set LOW, the standard must be set by the BG/

BG/ When this bit is HIGH it switches the DQPSK demodulator

to system BGH and attenuates the digital audio level by

I bit. Power-on resets to HIGH.

SAA7284

4.6 dB (if NICLEV is set HIGH). When LOW, the DQPSK demodulator switches to system I (with no 4.6 dB attenuation). Power-on resets to HIGH.

NICLEV When this bit is set LOW it overrides the 4.6 dB NICAM

audio level compensation, irrespective of whether the device is in automatic or manual system mode. When set HIGH the 4.6 dB compensation level is applied in system BGH. Power-on resets to HIGH.

STLOCK When STLOCK is set HIGH it will stop the automatic

system switch after the device has achieved an INSYNC condition, should the demodulator lose lock at any time. This minimizes the re-acquisition time. When set LOW the device will be permitted to change system after an INSYNC condition has been reached. Power-on resets to LOW.

Table 5 Output as a function of M1/

DMSEL M1/M2 FUNCTION

0 0 selects DIGITAL; L = M2, R = M2 0 1 selects DIGITAL; L = M1, R = M1 1 0 selects DIGITAL; L = M2, R = M1 1 1 selects DIGITAL; L = M1, R = M2

Table 7 SSWIT signal states and function

SSWIT3 SSWIT2 SSWIT1 FUNCTION

0 0 0 NICAM source de-emphasis switched out, no gain 0 0 1 NICAM source de-emphasis switched in, no gain 0 1 0 NICAM source de-emphasis switched in, +6 dB gain; power-on reset when

0 1 1 NICAM source de-emphasis switched in, +12 dB gain; power-on reset when

1X 1 X 1 FM inputs switched in, no change to previous de-emphasis/gain setting

Note

1. Where X = don’t care.

(1)

0 external inputs switched in, no change to previous de-emphasis/gain setting

M2 and DMSEL

PORA = HIGH

PORA = LOW

Table 6 Port 2 control

PORT2 PIN OUTPUT STATE

0 LOW 1 HIGH

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

Table 8 Action of pulling MUTE pin/I2C-bus bit LOW

TRANSMITTED

C4 BIT (RSSF)

1 1 or 0 stereo/mono/dual mono with L and R = M1 mute digital data

1 1 or 0 dual mono with M2 selected in either L or R no action no action 0 1 all modes no action no action 0 0 all modes mute digital data

Note

1. With MUTE pin/i2C-bus bit pulled LOW. If user has manually selected FM or NICAM inputs, no switching will occur.

Table 9 FM attenuation control

FM ATTENUATION (dB) FM3 FM2 FM1 FM0

C4OV TRANSMISSION MODE

MUTEDEF = 1 MUTEDEF = 0

and switch to FM

0 0000 1 0001 2 0010 3 0011 4 0100 5 0101 6 0110 7 0111 8 1000

9 1001 10 1010 11 1011 12 1100

Not deﬁned 1 1 0 1 Not deﬁned 1 1 1 0 Not deﬁned 1 1 1 1

OUTPUT ACTION

mute digital data only

(1)

Slave transmitter format

The slave transmitter format is shown in Table 10.

Table 10 Slave transmitter format

START slave_addr ACK data_byte ACK n-bytes data_byte

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ACK STOP

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Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

Table 11 Explanation of Table 10

ITEM DESCRIPTION

START I Slave_addr 101101XR X logic 0 when ADSEL = 0; logic 1 when ADSEL = 1 R logic 1, I ACK I Data_byte data byte transmitted from slave receiver ACK master device negative acknowledge to indicate last byte STOP I

C slave transmitter register map

The bus master can perform single-byte, two-byte, three-byte, four-byte or five-byte read in the order shown in Table 12.

Table 12 Slave transmitter data byte

BYTE D7 D6 D5 D4 D3 D2 D1 D0

STATUS BYTE 1 PONRES S/ ERROR BYTE ERR7 ERR6 ERR5 ERR4 ERR3 ERR2 ERR1 ERR0 AD BYTE 0 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 AD BYTE 1 OVW SAD 0 CI1 CI2 AD10 AD9 AD8 STATUS BYTE 2 C1 C2 C3 BG/

C-bus start condition

C-bus read from slave transmitter

C-bus acknowledge condition generated by slave receiver

C-bus stop condition

MD/S VDSP RSSF OSAMCFC

I0000

PONRES When set HIGH this bit indicates that a power-on reset has

occurred. It is cleared after the status byte has been read.

S/ This bit gives the stereo or mono broadcast indication.

Set HIGH indicates stereo transmission.

D/ When HIGH this bit indicates a dual mono broadcast.

VDSP When this bit is HIGH, it indicates that the digital data

transmission is a sound source. When LOW the transmission is either data or undefined format.

RSSF This bit reflects the state of the C4 bit in the NICAM

transmission. When set LOW, the FM sound content does not match the digital transmission, and switching to FM by automatic mute or setting

MUTE LOW is prevented

(if C4OV = HIGH).

When HIGH this bit indicates that the device has both frame and C0 (16 frame) synchronization.

AM When HIGH this bit indicates that the automatic mute

function has switched from NICAM to FM. When LOW the automatic mute function has not activated a switch.

CFC When LOW this bit indicates a configuration change at the

C0 (16 frame) boundary. It is reset after reading the status byte.

TO ERR0

ERR7 These bits indicate the number of errors occurring in the

previous 128 ms period.

AD7

TO AD0

These bits contain the eight least significant additional data bits.

1996 Oct 24 16

Page 17

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

OVW This bit is set when new additional data bits are written to

the I2C-bus without the previous bits being read.

SAD This bit is set HIGH when new additional data is written

into the I data.

CI1 These are the CI bits decoded by majority logic from the

parity checks of the last ten samples in a frame.

Indicator bits

Table 13 is the truth table for the indicator bits.

Table 13 Indicator bits functional truth table

Stereo 0 0 0 1 0 1 1 M1+M2 0100111 M1 + data 1 0 0 0 0 1 1 Transparent data 1 1 0 0 0 0 1 Any currently undeﬁned combination of C1, C2 and C3 0 0 0 1 Decoder unsynchronized (

C-bus, and cleared by the action of reading the

AND CI2

TRANSMISSION C1 C2 C3 S/

OS = logic 0) 0 0 0 0

AD10, AD9 AND AD8 These are the three most significant additional data bits.

C1, C2 These are the transmitted control bits, see Table 13.

BG/ When set HIGH this bit indicates that the DQPSK

demodulator is switched to system BGH. When LOW, indicates that DQPSK demodulator is switched to system I.

AND C3

MD/S VDSP OS

1996 Oct 24 17

Page 18

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

DIGITAL AUDIO INTERFACE IEC/EBU 958 Block structure

The output is grouped into a block of 192 consecutive frames providing, for each channel the 192 channel status data bits. The start of a block is designated by a special sub-frame preamble.

Frame structure

Each frame is uniquely composed of two sub-frames. The rate of transmission of frames corresponds exactly to the source sampling frequency. In the 2-channel operation, samples taken from both channels are transmitted by time multiplexing in consecutive sub-frames. Sub-frames related to Channel 1 (left or ‘A’ channel in stereophonic operation and primary channel in monophonic operation) normally use preamble M. However the preamble is changed to preamble B once every 192 frames. This defines the block structure used to organize the channel status information. Sub-frames of Channel 2 (right or ‘B’ channel in stereophonic operation and secondary channel in monophonic operation) always use preamble W.

SAA7284

Sub-frame structure

Each frame is divided into 32 time-slots numbered 0 to 31. Time-slots 0 to 3 carry one of three permitted preambles.

These are used to affect synchronization of sub-frames, frames and blocks.

Time-slots 4 to 27 carry the audio sample word in linear two's complement representation. The most significant bit is carried by time-slot 27.

Time-slot 28 carries the validity flag associated with the audio sample word. This flag is set to logic 0 if the audio sample is reliable. If set to logic 1 then the sample is unreliable.

Time-slot 29 carries one bit of the user data channel. In this application this is not used and so is set to logic 0.

Time-slot 30 carries one bit of the channel status word associated with the audio channel transmitted in the same sub-frame.

Time-slot 31 carries a parity bit such that time-slots 4 to 31 inclusive will carry an even number of ones and an even number of zeros.

handbook, full pagewidth

M channel 1

sync

preamble

MLB156

frame 191

channel 2

channel 1

sub-frame

start of block

frame 0

channel 2

sub-frame

Fig.5 Frame format.

31112

logical 0 bits audio sample word

S B

Fig.6 Sub-frame structure.

channel 1

validity flag

user data = logic 0

channel status

parity bit

frame 1

28 3127

VUCP

channel 2

MLB155

1996 Oct 24 18

Page 19

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

Channel coding

Time-slots are encoded as biphase mark data. Each bit transmitted is represented by a symbol comprising two consecutive binary states. The first state of a symbol is always different from the second state of the previous symbol. The second state of the symbol is identical to the first if the bit being transmitted is logic 0, however it is different if the bit is logic 1 (see Table 14).

Table 14 Channel coding

PRECEDING STATE 0 1

TRANSMITTED BIT CHANNEL CODING

01100 11001

Preambles

Preambles are specific patterns providing synchronization and identification of the sub-frames and blocks.

A set of three preambles is used. These preambles are transmitted in the time allocated to four time-slots and are represented by eight successive states. The first state of the preamble is always different from the second state of the previous symbol. Depending on this state the preambles are as shown in Table 15.

SAA7284

Table 15 Preambles

PRECEDING STATE 0 1

PREAMBLE CHANNEL CODING

B 11101000 00010111 M 11100010 00011101 W 11100100 00011011

The preambles preceding each digital audio sample are used to indicate the beginning of a sample as follows:

• Preamble B indicates the start of Channel A data and the beginning of a block

• Preamble M indicates the start of Channel A data but not the beginning of a block

• Preamble W indicates the start of Channel B data.

Channel status

The channel status information is organized in 192-bit words. The first bit of each word is carried in the frame with Preamble B. The 192-bit word is organized into sections as shown in Table 16.

Table 16 Channel status codes

BIT CODE DESCRIPTION

0 0 consumer 1 0 sound data 2 1 digital copy permitted

3 and 4 00 indicates digital de-emphasis switched in

11 indicates digital de-emphasis switched out

50−

6 and 7 00 −

8 to 15 00110001 category code 16 to 19 0000 source code (don't care) 20 to 23 0000 channel number (don't care) 24 to 27 1100 sampling frequency (32 kHz)

28 and 29 00 clock accuracy (level II)

30 to 191 all 0s −

1996 Oct 24 19

Page 20

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

LIMITING VALUES

In accordance with the Absolute Maximum Rating Systems (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

, V

DDF1

, V

SSF1

I(max)

O(max)

IOK

O(max)

amb

stg

stat(HBM)

stat(MM)

Notes

1. All V

2. Electrostatic handling is equivalent to discharging a 100 pF capacitor via a 1.5 kΩ series resistor with a 15 ns rise time.

3. Electrostatic handling is equivalent to discharging a 200 pF capacitor via a 0 Ω series resistor with a 15 ns rise time.

DDF2

SSF2

, V

DDA

SSA

supply voltage (all supplies) note 1 −0.3 +6.5 V ground supply voltage V maximum input voltage (any input) 0 V maximum output voltage 0 V DC input or output diode current −±20 mA output current (each output) −±10 mA ambient operating temperature −20 +70 °C storage temperature −55 +125 °C electrostatic handling

Human Body Model note 2 −2000 +2000 V Machine Model note 3 −200 +200 V

and VSS connections must be made externally to the same power supply.

SSD

− 0.5 V

SSD DD DD

+ 0.5 V

V V

QUALITY AND RELIABILITY

This device will meet Philips Semiconductors General Quality Specification for Business group

Circuits SNW-FQ-611-Part E”

“Consumer Integrated

1996 Oct 24 20

Page 21

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYSTEM PERFORMANCE Bit Error Rate (BER)

−3

Table 17 shows input signal conditions which typically produce bit error rates of less than 10 are related to the picture carrier reference level (0 dB) and based on the output level of the set up as shown in Fig.8. All measurements are at RF and using Philips Semiconductors SAA7284 Applications Board.

Table 17 System performance

INPUT SIGNAL CONDITIONS

Picture carrier RF level (FM deviation = ±50 kHz) 35 35 35 dB NICAM level with respect to picture carrier (FM deviation = ±50 kHz) −35 −34 −32 dB FM overmodulation >120 >100 >100 kHz

Notes

1. Measurements made with colour bar at 100% modulation. a) FM level = −10 dB system I; −13 dB system BG. b) NICAM level = −20 dB (unless otherwise specified).

2. 10 dB sound shelf with extended bandwidth for NICAM signal.

3. 14 dB sound shelf with extended bandwidth for NICAM signal.

(1)

SYSTEM I SYSTEM BG

SAW A

(2)

. Signal levels given in dB

SAW B

(2)

SAW C

(3)

UNIT

Acquisition time

Maximum acquisition time = 1 s, measured from power-on to reset in-sync condition achieved.

1996 Oct 24 21

Page 22

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

CHARACTERISTICS

= 4.5 to 5.5 V; T

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Digital supplies (note 1)

V V I

DDD

DDD SSD

digital supply voltage 4.5 5.0 5.5 V digital ground supply voltage − 0 − V

digital supply current − 15 − mA Audio supplies (note 1) V

DDA

SSA

SSDAC

DDA

audio supply voltage 4.5 5.0 5.5 V

audio ground supply voltage − 0 − V

DAC ground supply voltage − 0 − V

audio supply current − 19 − mA Demodulator supplies (note 1) V

DDF1 SSF1

1st front-end supply voltage 4.5 5.0 5.5 V

1st front-end ground supply

voltage I

DDF1

DDF2

SSF2

1st front-end supply current − 46 − mA

2nd front-end supply voltage 4.5 5.0 5.5 V

2nd front-end ground supply

voltage I

DDF2

2nd front-end supply current − 125 − mA

Digital inputs

= −20 to +70 °C; unless otherwise speciﬁed.

amb

− 0 − V

DATAIN (TTL/CMOS V

LOW level input voltage 0 − 0.8 V

HIGH level input voltage 2.0 − V

input leakage current −10 − +10 µA

input capacitance −−10 pF

COMPATIBLE INPUT LEVELS)

ADSEL, PORM AND PORA (TTL/CMOS COMPATIBLE INPUT LEVELS WITH INTERNAL PULL-UP) V

i(pu)

LOW level input voltage 0 − 0.8 V

HIGH level input voltage 2.0 − V

input pull-up resistance − 50 − kΩ

input capacitance −−10 pF RESET AND SCL (CMOS/I2C-BUS INPUT LEVELS WITH SCHMITT TRIGGER) V

hys

LOW level input voltage 0 − 1.5 V

HIGH level input voltage 3.0 − V

hysteresis − 0.05V

input leakage current −10 − +10 µA

input capacitance −−10 pF

− V

1996 Oct 24 22

Page 23

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Digital input/output

SDA (I2C-BUS LEVELS WITH SCHMITT TRIGGER/OPEN-DRAIN OUTPUT) V

hys

MUTE (TTL/CMOS COMPATIBLE INPUT LEVELS/OPEN-DRAIN OUTPUT WITH INTERNAL PULL-UP) V

Digital outputs

LOW level input voltage 0 − 1.5 V

HIGH level input voltage 3.0 − V

hysteresis 0.05V

−−V

input leakage current −10 − +10 µA

input capacitance −−10 pF

LOW level output voltage IOL=+3mA 0 − 0.4 V

load capacitance

active pull-up −−400 pF passive pull-up −−200 pF

LOW level input voltage 0 − 0.8 V

HIGH level input voltage 2.0 − V

V input capacitance −−10 pF LOW level output voltage IOL=+3mA 0 − 0.4 V HIGH level output voltage IOH= −3 mA 2.4 − V load capacitance with active

−−50 pF

pull-up input impedance − 50 − kΩ

PORT2, PCLK V

AND DATAOUT (PUSH-PULL OUTPUT)

LOW level output voltage IOL=+2mA 0 − 0.4 V HIGH level output voltage IOH= −2 mA 2.4 − V load capacitance −−50 pF

DOBM (3-STATE PUSH-PULL OUTPUT) V

LOW level output voltage IOL=+2mA 0 − 0.4 V HIGH level output voltage IOH= −2 mA 2.4 − V load capacitance −−50 pF 3-state leakage current VI= 0 to V

ANALOG SECTION (measured at V Demodulator analog references

OUTPUT

RCF

V C

V V

i ROF o

OUTPUT

output signal voltage supply dependent − 0.5V input capacitance −−10 pF

output signal voltage deﬁned by V input capacitance −−10 pF

=5V; T

amb

=25°C)

RCF

−10 − +10 µA

− V

DDF2

− 0.5V

DDF2

− V

1996 Oct 24 23

Page 24

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

OUTPUT

REF

sink

Signal path analog inputs

DQPSK R

iDQPSK(rms)

iDR

iCUM(rms)

Baseband outputs

output signal voltage deﬁned by V

RCF

− 0.5V

DDF2

− V input capacitance −−10 pF output sink current with external 10 kΩ

− 250 −µA resistor from pin to V

SSF2

AND MIXREF

input resistance − 12.5 − kΩ NICAM input signal voltage V

(RMS value)

10 dB SAW sound

nom

shelf 14 dB SAW sound

− 24.5 − mV

− 15.5 − mV

shelf

AGC range with respect to

iDQPSK

; 10 dB SAW

with respect to

iDQPSK

; 14 dB SAW

cumulative input signal voltage

V note 2 −−464 mV

+10 +10 − dB

−15 −20 − dB

+10 +10 − dB

−11 −16 − dB

(RMS value) input capacitance −−10 pF

AND SEYE

CEYE V

o(p-p)

eye pattern output signal voltage (peak-to-peak value)

I/Q

channel matching 20log

COFF AND SOFF V

offset compensator DC output voltage

Baseband ﬁlters

YSTEM I

S Af

pass band cut-off attenuation fi= 6552 MHz

FMr FM rejection f

FMomr FM rejection (overmodulated FM) f

CCr colour-carrier rejection f

in-lock; system I;

− 1.25 − V note 3

in-lock; system B/G;

− 1.79 − V note 3

CEYE/VSEYE

deﬁned by V

)

RCF

−2 0 +2 dB

− 0.5V

DDF2

− V

1.9 3.1 4.6 dB + 182 kHz

= 6.0 MHz

− 65 − dB ± 50 kHz

= 6.0 MHz

45 50 − dB

± 80 kHz

= 4.43 MHz 70 78 − dB

1996 Oct 24 24

Page 25

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

SYSTEM BGH Af

pass band cut-off attenuation fi= 5850 MHz

FMr FM rejection f

FMomr FM rejection (overmodulated FM) f

CCr colour-carrier rejection f

Baseband demodulator output

REMO V

o p

offset

output voltage limits 0.2 − VDD− 0.5 V carrier loop-phase detector gain system I − 1.2 − V/rad

carrier loop pull-in frequency 4 −−kHz carrier loop-phase detector offset phase shift = 45°−4 0 +4 deg carrier loop bandwidth

(natural frequency)

+ 182 kHz

= 5.5 MHz

± 50 kHz

= 5.5 MHz

± 80 kHz

= 4.43 MHz 66 73 − dB

system B/G − 0.9 − V/rad

1.7 3.1 4.5 dB

− 50 − dB

25 30 − dB

2 − 5 kHz

Baseband remodulator ﬁlter feedback

REMVE V

carrier loop ﬁlter virtual earth

deﬁned by V

voltage

Fine frequency calibration current (on to REMVE node)

source

sink

fstep

output source current − 15 −µA output sink current − 15 −µA 3-state leakage current −0.25 0 +0.25 µA ﬁne frequency calibration step 0.8 2 8 kHz

Voltage controlled oscillator

VCONT V

VCO (MEASURED AT V f

VCO

input signal voltage 0.5 − VDD− 0.5 V input capacitance −−10 pF

PIN)

CLK

VCO frequency after DAC calibration

VCO frequency after ﬁne frequency calibration

= 6552 MHz

SYS

(system I) or f

= 5.85 MHz

SYS

(system BGH)

VCO slope system I −139 −186 −232 kHz/V

system B/G −191 −255 −319 kHz/V

DAC

STEP

VCO calibrating DAC step size −50 +30 +50 kHz

ItoQ in-phase to quadrature phase

accuracy

VCO phase jitter note 4 −−8.1 ns

1996 Oct 24 25

RCF

− 0.5V

− 75 − f

SYS

− 4 − f

SYS

DDF2

− V

+ 75 kHz

SYS

+ 4 kHz

SYS

− 90 − deg

Page 26

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Clock recovery loop and crystal oscillator

XTAL C

bias

OSC V

osc(p-p)

bias

CRYSTAL SPECIFICATION (FUNDAMENTAL MODE)

C1 series capacitance 21 −−fF C0 parallel capacitance −−5pF S pulling sensitivity determined by C

DLD

range

CLOCK RECOVERY LOOP CURRENT SOURCE (CLKLPF)

input capacitance −−10 pF DC bias voltage − 3.63 − V

oscillator voltage amplitude

− 1.4 − V

(peak to peak value) DC bias voltage − 2.33 − V small signal voltage gain − 1.0 − V/V output capacitance −−10 pF

crystal input frequency − 8.192 − MHz load capacitance − 15 − pF

−26.25 −−10−6/pF

C1 and C0

resonance resistance −−40 Ω resonance resistance; drive level

−−120 Ω

dependency ageing −−±510

−6

/year temperature range −20 +25 +70 °C adjustment tolerance −−±30 10 drift across T

3-state leakage current atπ⁄ phase shift

phase comparator transconductance

0.5 ≤ V VDD− 0.5; note 5

range

CLKLPF

≤

−−±30 10

−50 +5µA

57 63.5 70 µA/rad

−6

Analog references

OUTPUT

RCA

V C

V V

i ROA O

OUTPUT

output signal voltage supply dependent − 0.5V

DDA

− V

input capacitance −−10 pF

output signal voltage deﬁned by V

RCA

− 0.5V

DDA

− V

input capacitance −−10 pF

Digital ﬁlter

output sample frequency − 128 − kHz PR pass band ripple at 0 Hz to 15 kHz −−±0.01 dB SBA stop band attenuation at f ≥ 17 kHz 30 −−dB

1996 Oct 24 26

Page 27

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Digital de-emphasis

DEV deviation from ideal −−±0.09 dB

FM audio inputs

AND FMR (SELECTED VIA I

FML Z

input impedance 0 dB FM attenuation

G output gain programmable in

ain(rms)

output gain accuracy −0.5 0 +0.5 dB

input voltage level (RMS value) −−1.1 V S/N signal-to-noise ratio 90 95 − dB THD total harmonic distortion −−85 −70 dB

EXT audio input

AND EXTR (SELECTED VIA I

EXTL Z

input impedance − 40 − kΩ G output gain − 0 − dB G

ain(rms)

output gain accuracy − 0 − dB

input voltage level (RMS value) −−1.1 V S/N signal-to-noise ratio 90 95 − dB THD total harmonic distortion −−85 −70 dB

NICAM internal DAC (selected via I

o(rms)

NICAM output voltage level

(RMS value) THD+N total harmonic distortion plus

noise DIGS digital silence level AUDIOS audio silence level SILENCE on = 0 −80 −−dB

C-BUS CONTROL)

C-bus control)

− 40 − kΩ

set

−12 dB FM

− 160 − kΩ

attenuation set

− 0to12 − dB

1 dB steps

0 dB; V

= 2.5 V 0.94 1 1.06 V

ROA

notes 6 and 7 −−80 −75 dB

MUTE on −−80 − dB

Audio outputs

OPL AND OPR C

output load capacitance −−300 pF

output load resistance 3 −−kΩ CHM channel matching 0 dB, 1 kHz −0.5 0 +0.5 dB PSRR power supply rejection ratio − 40 − dB

1996 Oct 24 27

Page 28

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Timing (all timing values refer to V

DATAIN t

SU;DAT

HD;DAT

WITH RESPECT TO PCLK (see Fig.9)

data set-up time 100 −−ns

data hold time 250 −−ns SDA WITH RESPECT TO SCL(see Fig.10) f

SCL

BUF

HD;STA

LOW

HIGH

SU;STA

HD;DAT

SU;DAT

SU;STO

SCL clock frequency 0 − 400 kHz

bus free time 1300 −−ns

START code hold time 600 −−ns

SCL clock LOW time 1300 −−ns

SCL clock HIGH time 600 −−ns

START code set-up time 600 −−ns

data hold time note 8 0 −−ns

data set-up time note 9 100 −−ns

SDA and SCL rise time 50 − 300 ns

SDA and SCL fall time 50 − 300 ns

STOP code set-up time 600 −−ns

Notes

1. It is assumed that all supplies are externally connected at the same source, and consequently that maximum and minimum values apply simultaneously to each supply.

2. Cumulative input level based on FM at 0 dB and NICAM at −10 dB with respect to picture carrier.

3. The signal amplitude present at the SEYE and CEYE pins depends on whether the demodulator is in or out-of-lock. When out-of-lock, the signal at the pins is √2 times the in-lock situation.

4. VCO jitter is measured in System I over 100 cycles of the VCO clock.

5. With 10 kΩ resistor from I

REF

6. Audio performance is limited by the dynamic range of the NICAM 728 system. Due to compansion, the quantization noise is never lower than −62 dB with respect to the input level.

7. Measured with a −30 dB, 1 kHz NICAM 728 input signal.

8. Note that a transmitter must internally provide at least a hold time to bridge the undefined region (max. 300 ns) of the falling edge of SCL.

9. If a fast I2C-bus device is used in an up to 100 kbit/s I2C-bus system, then the requirement t fulfilled if this device cannot stretch the LOW level of the SCL signal. If a device stretches the LOW level of the SCL signal, then data to SDA must be asserted (t released to be compatible with the up to 100 kbit/s I2C-bus specification.

and VIL levels)

to V

SSF2

RD(max)+tSU;DAT

≥ 250 ns is always

SU;DAT

) = 1000 + 250 = 1250 ns before the SCL signal is

1996 Oct 24 28

Page 29

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

handbook, full pagewidth

supply

100

Ω

2.2

DDF1

100

2.2

DDF2

SAA7284

100

Ω

DDA

MBH219

Ω

DDD

Ω

100

Fig.7 VDD external circuitry.

1996 Oct 24 29

Page 30

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

audio

CVBS

external

TDA9800

VISION PLL-IF

DEMODULATOR

audio inputs

FMDQPSK

left

outputs

DAC

STEREO

BITSTREAM

DQPSK

DEMODULATOR

right

AND

SWITCHES

I C

DAI

NICAM

DECODER

I C-bus

SAA7284

DOBM

MBH224

filter

SAW

U944C

TUNER

RF

input

handbook, full pagewidth

32.9 MHz I

33.4 MHz B/G

10 dB/14 dB

1996 Oct 24 30



Vision

38.9 MHz

Nicam

33.05 MHz

32.348 MHz

Fig.8 System block diagram showing SAA7284.

Page 31

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

handbook, full pagewidth

PCLK

DATA

SU;DAT

HD;DAT

SAA7284

MLB158

handbook, full pagewidth

SDA

SCL

SDA

MBC764

BUF

HD;STA

Fig.9 Data output timing.

LOW

HD;DAT

SU;STA

HIGH

SU;DAT

SU;STO

Fig.10 I2C-bus timing.

1996 Oct 24 31

Page 32

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

APPLICATION INFORMATION

left

audio

68

SSA

Ω

Ω10 k

1 M

µF47

100

Ω2.2

10

Ω100

390 pF

DQPSK input

DDF1

Ω1 k

SSF1

V (5 V)

100

SSF2

SSF1

supply

µF

SSF1

µF

SSF1

connector

n.c.

DDF1

VCONT MIXREF

DQPSK

n.c.

PKDET

REMO

ROF

47 nF

Ω1.8 k

Ω10 k

Ω33 k

n.c.

202122242526272829303132 23

SEYE SOFF SSF1

VCLK

n.c.

COFF CEYE

n.c.

REMVE

REF

220

DDF2

PORA

RCF

100

Ω

2.2

SSA

EXTL

PORM

DDF2

100

µF

100

SSF2

FML

TEST

SSF2

220

OPL

CLKLPF

EXTL

220

n.c.

SAA7284

OSC

XTAL

100 pF

8.192 MHz

Ω22 k

330 nF

FML

SSDAC

SSX

22 nF

FMR

ROA

DATAIN

H6.8

Ω1 M

EXTR

220

SSA

100

n.c.

DATAOUT

PCLK

BB405

SSF2

SSA

OPR

SSD

100 nF

FMR

DDD

SSD

SSF2

EXTR

RESET

Ω

DDD

n.c.

audio

Ω10 k

F47

n.c.

RCA

SSA

DDA

n.c.

DOBM

n.c. MUTE

PORT2

ADSEL

SDA

SCL n.c.

BAW62

Ω680 k

right

68

646362605958575655545352 61

470 nF

SAA7284

SSA

Ω1 M

Ω10

SSA

digital

SDA

SCL

DDD

SSD

MBH225

µF

100

audio

I C bus

connector

SSA

DDA

interface

SSD

handbook, full pagewidth

Fig.11 Application diagram for QFP64.

1996 Oct 24 32

Page 33

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

PACKAGE OUTLINES

SDIP52: plastic shrink dual in-line package; 52 leads (600 mil)

seating plane

SAA7284

SOT247-1

w M

(e )

pin 1 index

DIMENSIONS (mm are the original dimensions)

UNIT b

max.

5.08 0.51 4.0

min.

max.

1.3

0.8

0.53

0.40

0 5 10 mm

scale

cEe M

0.32

0.23

(1) (1)

47.9

47.1

14.0

13.7

3.2

15.80

2.8

15.24

17.15

15.90

0.181.778 15.24

max.

1.73

(1)

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

OUTLINE

VERSION

SOT247-1

IEC JEDEC EIAJ

REFERENCES

1996 Oct 24 33

EUROPEAN

PROJECTION

ISSUE DATE

90-01-22 95-03-11

Page 34

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

QFP64: plastic quad flat package; 64 leads (lead length 1.95 mm); body 14 x 20 x 2.8 mm

51 33

SAA7284

SOT319-2

pin 1 index

w M

0.50

0.35

0 5 10 mm

(1)

(1) (1)(1)

0.25

0.14

20.1

19.9

14.1

13.9

DIMENSIONS (mm are the original dimensions)

max.

3.20

0.25

0.05

2.90

2.65

0.25

UNIT A1A2A3bpcE

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

scale

24.2

23.6

w M

v M

LLpQZywv θ

18.2

17.6

1.0

0.6

1.4

1.2

detail X

0.2 0.10.21.95

(A )

1.2

0.8

1.2

0.8

OUTLINE VERSION

SOT319-2

IEC JEDEC EIAJ

REFERENCES

1996 Oct 24 34

EUROPEAN

PROJECTION

ISSUE DATE

92-11-17 95-02-04

Page 35

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

SOLDERING Introduction

There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used.

This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in

“IC Package Databook”

our

SDIP

OLDERING BY DIPPING OR BY WA VE

S The maximum permissible temperature of the solder is

260 °C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds.

The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (T printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.

EPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds.

QFP

REFLOW SOLDERING Reflow soldering techniques are suitable for all QFP

packages. The choice of heating method may be influenced by larger

plastic QFP packages (44 leads, or more). If infrared or vapour phase heating is used and the large packages are not absolutely dry (less than 0.1% moisture content by weight), vaporization of the small amount of moisture in them can cause cracking of the plastic body. For more information, refer to the Drypack chapter in our

Reference Handbook”

(order code 9398 652 90011).

). If the

stg max

“Quality

(order code 9397 750 00192).

SAA7284

Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary from 50 to 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 °C.

Preheating is necessary to dry the paste and evaporate the binding agent. Preheat for 45 minutes at 45 °C.

AVE SOLDERING

W Wave soldering is not recommended for QFP packages.

This is because of the likelihood of solder bridging due to closely-spaced leads and the possibility of incomplete solder penetration in multi-lead devices.

If wave soldering cannot be avoided, the following conditions must be observed:

• A double-wave (a turbulent wave with high upward

pressure followed by a smooth laminar wave) soldering technique should be used.

• The footprint must be at an angle of 45° to the board

direction and must incorporate solder thieves downstream and at the side corners.

Even with these conditions, do not consider wave soldering the following packages: QFP52 (SOT379-1), QFP100 (SOT317-1), QFP100 (SOT317-2), QFP100 (SOT382-1) or QFP160 (SOT322-1).

During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 °C within 6 seconds. Typical dwell time is 4 seconds at 250 °C.

A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications.

EPAIRING SOLDERED JOINTS

R Fix the component by first soldering two diagonally-

opposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C.

1996 Oct 24 35

Page 36

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for

SAA7284

conventional intercarrier PLL-IF systems

DEFINITIONS

Data sheet status

Objective speciﬁcation This data sheet contains target or goal speciﬁcations for product development. Preliminary speciﬁcation This data sheet contains preliminary data; supplementary data may be published later. Product speciﬁcation This data sheet contains ﬁnal product speciﬁcations.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speciﬁcation is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the speciﬁcation.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.

PURCHASE OF PHILIPS I

Purchase of Philips I components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011.

C COMPONENTS

C components conveys a license under the Philips’ I2C patent to use the

1996 Oct 24 36

Page 37

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

NOTES

SAA7284

1996 Oct 24 37

Page 38

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

NOTES

SAA7284

1996 Oct 24 38

Page 39

Philips Semiconductors Preliminary speciﬁcation

Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems

NOTES

SAA7284

1996 Oct 24 39

Page 40

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Tel. +381 11 625 344, Fax.+381 11 635 777

For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.

Internet: http://www.semiconductors.philips.com

Printed in The Netherlands 537021/1200/01/pp40 Date of release: 1996 Oct 24 Document order number: 9397 750 01426