Philips tda9817, tda 9818 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA9817; TDA9818

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

Preliminary speciﬁcation File under Integrated Circuits, IC02

1997 May 12

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

FEATURES

• 5 V supply voltage

• Applicable for IFs (Intermediate Frequencies) of

38.9 MHz, 45.75 MHz and 58.75 MHz

• Gain controlled wide band Video IF (VIF)-amplifier (AC-coupled)

• True synchronous demodulation with active carrier regeneration (very linear demodulation, good intermodulation figures, reduced harmonics, excellent pulse response)

• Robustness for over-modulation better than 105% due to gated phase detector at L/L accent standard and PLL-bandwidth control at negative modulated standards

• VCO (Voltage Controlled Oscillator) frequency switchable between L and L accent (alignment external) picture carrier frequency

• VIF AGC (Automatic Gain Control) detector for gain control, operating as peak sync detector for B/G, peak white detector for L; signal controlled reaction time for L

• Tuner AGC with adjustable TakeOver Point (TOP)

• AFC (Automatic Frequency Control) detector without

extra reference circuit

TDA9817; TDA9818

• AC-coupled limiter amplifier for sound intercarrier signal

• Alignment-free FM PLL (Phase Locked Loop)

demodulator with high linearity

• SIF (Sound IF) input for single reference QSS (Quasi Split Sound) mode (PLL controlled); SIF AGC detector for gain controlled SIF amplifier; single reference QSS mixer able to operate in high performance single reference QSS mode and in intercarrier mode

• AM demodulator without extra reference circuit

• Stabilizer circuit for ripple rejection and to achieve

constant output signals

• ESD (Electrostatic Discharge) protection for all pins.

GENERAL DESCRIPTION

The TDA9817 is an integrated circuit for single standard vision IF signal processing and FM demodulation.

The TDA9818 is an integrated circuit for multistandard vision IF signal processing, sound AM and FM demodulation.

ORDERING INFORMATION

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA9817 SDIP24 plastic shrink dual in-line package; 24 leads (400 mil) SOT234-1 TDA9818 SDIP24 plastic shrink dual in-line package; 24 leads (400 mil) SOT234-1

PACKAGE

1997 May 12 2

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and

TDA9817; TDA9818

FM-PLL/AM demodulators

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

i(VIF)(rms)

o(video)(p-p)

−3

S/N

IM(1.1)

IM(3.3)

H(sup)

i(SIF)(rms)

o(rms)

THD

audio

S/N

W(audio)

supply voltage 4.5 5 5.5 V supply current 76 90 104 mA vision IF input signal voltage

−1 dB video at output − 60 100 µV

sensitivity (RMS value) video output signal voltage

0.97 1.1 1.23 V

(peak-to-peak value)

−3 dB video bandwidth on pin 16 B/G and L standard; < 20 pF; RL>1kΩ; AC load

weighted signal-to-noise ratio for

78−MHz

56 60 − dB

video intermodulation attenuation at ‘blue’ f = 1.1 MHz 58 64 − dB intermodulation attenuation at ‘blue’ f = 3.3 MHz 58 64 − dB suppression of harmonics in video

35 40 − dB

signal sound IF input signal voltage

−3 dB at intercarrier output − 50 100 µV

sensitivity (RMS value) audio output signal voltage for FM

(RMS value)

B/G standard; 27 kHz modulation (54%)

M, N standard;

0.4 0.5 0.6 V

0.36 0.45 0.54 V

25 kHz modulation

audio output signal voltage for AM

L standard; 54% modulation 0.4 0.5 0.6 V

(RMS value) total harmonic distortion audio signal 54% modulation

FM − 0.2 0.5 % AM − 0.5 1.0 %

weighted signal-to-noise ratio audio

54% modulation

signal

FM 55 60 − dB AM 47 53 − dB

1997 May 12 3

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

BLOCK DIAGRAM

video

SOUND

video

2021171819

GND

AFC

VOLTAGE

REFERENCE

AFC

VIDEO

DETECTOR

(p-p)

audio

1 V

TRAP

(p-p)

1.1 V 8

AND AMPLIFIER

DEMODULATOR

10 11 9

FM-PLL

DEMODULATOR

TDA9817; TDA9818

MHA663

DEC

de-em

mute

switch

2 × f

and adjust

L/L accent switch

PLL

VAGC

TOP

(1)

615

422

(1)

VIF

AGC

TUNER

tuner AGC

VCO

TWD

QSS MIXER

AM DEMODULATOR

INTERCARRIER MIXER

TDA9817

TDA9818

MODE SWITCH

INTERCARRIER

VIF AMPLIFIER FPLL

VIF

SAW

SIF AMPLIFIER

SIF

SAW

SIF

mode

intercarrier

AGC

5.5 MHz

handbook, full pagewidth

Fig.1 Block diagram.

(1)

switch

selection

standards

SAGC

(1) Not connected for TDA9817.

1997 May 12 4

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

PINNING

SYMBOL PIN DESCRIPTION

i VIF1

i VIF2

(1)

STD C

VAGC

SAGC

PLL

(1)

LADJ V

oAF

de-em

DEC

o QSS

iFM

TAGC 14 tuner AGC output

(1)

o(vid)

AFC 17 AFC output VCO1 18 VCO1 resonance circuit VCO2 19 VCO2 resonance circuit GND 20 ground V

TADJ 22 tuner AGC takeover point adjust V

i SIF1

i SIF2

1 VIF differential input signal voltage 1 2 VIF differential input signal voltage 2 3 standard switch 4 VIF AGC capacitor 5 SIF AGC capacitor 6 PLL loop ﬁlter 7 L/L accent switch and adjust 8 audio output

9 de-emphasis input 10 de-emphasis output 11 decoupling capacitor

single reference QSS/intercarrier

output voltage

13 sound intercarrier input voltage

15 black level detector 16 composite video output voltage

21 supply voltage

23 SIF differential input signal voltage 1 24 SIF differential input signal voltage 2

handbook, halfpage

(1) Not connected for TDA9817.

V V

C C

LADJ

V C

i VIF1 i VIF2

STD

VAGC SAGC

PLL

o AF de-em de-em

DEC

o QSS

1 2

(1)

3 4 5 6

(1)

7 8

9 10 11 12

Fig.2 Pin configuration.

TDA9817; TDA9818

i SIF2

i SIF1

TADJ

GND

VCO2

MHA664

VCO1

AFC

o(vid)

(1)

TAGC

14 13

i FM

TDA9818 TDA9817

Note

1. Not connected for TDA9817.

1997 May 12 5

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

FUNCTIONAL DESCRIPTION

The integrated circuit comprises the functional blocks as shown in Fig.1:

• Vision IF amplifier and VIF AGC detector

• Tuner AGC

• Frequency Phase Locked Loop detector (FPLL)

• VCO, Travelling Wave Divider (TWD) and AFC

• Video demodulator and amplifier

• SIF amplifier and SIF AGC

• Single reference QSS mixer

• AM demodulator

• FM-PLL demodulator

• AF (Audio Frequency) signal processing

• Internal voltage stabilizer.

Vision IF ampliﬁer and VIF AGC detector

The vision IF amplifier consists of three AC-coupled differential amplifier stages. Each differential stage comprises a feedback network controlled by emitter degeneration.

The AGC detector generates the required VIF gain control voltage for constant video output by charging/discharging the AGC capacitor. Therefore for negative video modulation the sync level and for positive video modulation the peak white level of the video signal is detected. In order to reduce the reaction time for positive modulation, where a very large time constant is needed, an additional level detector increases the discharging current of the AGC capacitor (fast mode) in the event of a decreasing VIF amplitude step. The additional level information is given by the black-level detector voltage.

Tuner AGC

The AGC capacitor voltage is converted to an internal IF control signal, and is fed to the tuner AGC to generate the tuner AGC output current at pin TAGC (open-collector output). The tuner AGC takeover point can be adjusted at pin TADJ. This allows to match the tuner to the SAW filter in order to achieve the optimum IF input level.

Frequency Phase Locked Loop detector (FPLL)

The VIF-amplifier output signal is fed into a frequency detector and into a phase detector via a limiting amplifier. During acquisition the frequency detector produces a DC current proportional to the frequency difference between the input and the VCO signal. After frequency lock-in the phase detector produces a DC current proportional to the

TDA9817; TDA9818

phase difference between the VCO and the input signal. The DC current of either frequency detector or phase detector is converted into a DC voltage via the loop filter, which controls the VCO frequency. In the event of positive modulated signals the phase detector is gated by composite sync in order to avoid signal distortion for overmodulated VIF signals.

VCO, Travelling Wave Divider (TWD) and AFC

The VCO operates with a resonance circuit (with L and C in parallel) at double the PC frequency. The VCO is controlled by two integrated variable capacitors. The control voltage required to tune the VCO from its free-running frequency to actually double the PC frequency is generated by the frequency-phase detector (FPLL) and fed via the loop filter to the first variable capacitor. This control voltage is amplified and additionally converted into a current which represents the AFC output signal. At centre frequency the AFC output current is equal to zero.

For TDA9818: the VCO centre frequency can be decreased (required for L accent standard) by activating an additional internal capacitor. This is achieved by using the L accent switch. In this event the second variable capacitor can be controlled by a variable resistor at the L accent switch for setting the VCO centre frequency to the required L accent value.

The oscillator signal is divided by 2 with a TWD which generates two differential output signals with a 90 degree phase difference independent of the frequency.

Video demodulator and ampliﬁer

The video demodulator is realized by a multiplier which is designed for low distortion and large bandwidth. The vision IF input signal is multiplied with the ‘in phase’ signal of the travelling wave divider output. In the demodulator stage the video signal polarity can be switched in accordance with the TV standard.

The demodulator output signal is fed via an integrated low-pass filter for attenuation of the carrier harmonics to the video amplifier. The video amplifier is realized by an operational amplifier with internal feedback and high bandwidth. A low-pass filter is integrated to achieve an attenuation of the carrier harmonics for B/G and L standard. The standard dependent level shift in this stage delivers the same sync level for positive and negative modulation. The video output signal at V

1.1 V (p-p) for nominal vision IF modulation, in order to achieve 1 V (p-p) at sound trap output.

o(vid)

1997 May 12 6

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators

SIF ampliﬁer and SIF AGC

The sound IF amplifier consists of two AC-coupled differential amplifier stages. Each differential stage comprises a controlled feedback network provided by emitter degeneration.

The SIF AGC detector is related to the SIF input signal (average level of AM or FM carrier) and controls the SIF amplifier to provide a constant SIF signal to the AM demodulator and single reference QSS mixer. At L standard (AM sound) the SIF AGC reaction time is set to ‘slow’ for nominal video conditions. But with a decreasing VIF amplitude step the SIF AGC is set to ‘fast’ mode controlled by the VIF AGC detector. In FM mode this reaction time is always ‘fast’.

Single reference QSS mixer

The single reference QSS mixer is realized by a multiplier. The SIF amplifier output signal is fed to the single reference QSS mixer and converted to intercarrier frequency by the regenerated picture carrier (VCO). The mixer output signal is fed via a high-pass for attenuation of the video signal components to the output pin 12. With this system a high performance hi-fi stereo sound processing can be achieved.

For a simplified application without a sound IF SAW filter the single reference QSS mixer can be switched to the intercarrier mode by connecting pin 24 to ground. In this mode the sound IF passes the vision IF SAW filter and the composite IF signal is fed to the single reference QSS mixer. This IF signal is multiplied with the 90 degree TWD output signal for converting the sound IF to intercarrier frequency. This composite intercarrier signal is fed to the output pin 12, too. By using this quadrature detection, the low frequency video signals are removed.

AM demodulator

The AM demodulator is realized by a multiplier. The modulated SIF amplifier output signal is multiplied in phase with the limited (AM is removed) SIF amplifier output signal. The demodulator output signal is fed via an integrated low-pass filter for attenuation of the carrier harmonics to the AF amplifier.

TDA9817; TDA9818

consists of 7 stages which are internally AC-coupled in order to minimize the DC offset.

Furthermore the AF output signal can be muted by connecting a resistor between the limiter input pin 13 and ground.

The FM-PLL consists of an integrated relaxation oscillator, an integrated loop filter and a phase detector. The oscillator is locked to the FM intercarrier signal, output from the limiter. As a result of locking, the oscillator frequency tracks with the modulation of the input signal and the oscillator control voltage is superimposed by the AF voltage. The FM-PLL operates as an FM demodulator.

AF signal processing

The AF amplifier consists of two parts:

1. The AF pre-amplifier for FM sound is an operational amplifier with internal feedback, high gain and high common mode rejection. The AF voltage from the PLL demodulator, by principle a small output signal, is amplified by approximately 33 dB. The low-pass characteristic of the amplifier reduces the harmonics of the intercarrier signal at the sound output terminal pin 9 at which the de-emphasis network for FM sound is applied. An additional DC control circuit is implemented to keep the DC level constant, independent of process spread.

2. The AF output amplifier (10 dB) provides the required output level by a rail-to-rail output stage. This amplifier makes use of an input selector for switching to AM, FM de-emphasis or mute state, controlled by the standard switching voltage and the mute switching voltage.

Internal voltage stabilizer

The bandgap circuit internally generates a voltage of approximately 1.25 V, independent of supply voltage and temperature. A voltage regulator circuit, connected to this voltage, produces a constant voltage of 3.6 V which is used as an internal reference voltage.

FM-PLL demodulator

The FM-PLL demodulator consists of a limiter and an FM-PLL. The limiter provides the amplification and limitation of the FM sound intercarrier signal. The result is high sensitivity and AM suppression. The amplifier

1997 May 12 7

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and

TDA9817; TDA9818

FM-PLL/AM demodulators

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

sc(max)

TAGC

stg

amb

Notes

1. I

2. Machine model class B.

supply voltage maximum chip temperature

− 5.5 V

of 110 °C; note 1

voltage at pins 1 to 6, 9 to 11, 13to15, 17

and 21 to 24 maximum short-circuit time to ground or V

− 10 s tuner automatic gain control output voltage 0 13.2 V storage temperature −25 +150 °C operating ambient temperature −20 +70 °C electrostatic handling voltage note 2 −300 +300 V

= 104 mA; T

=70°C; R

amb

th j-a

= 65 K/W.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th j-a

thermal resistance from junction to ambient in free air 65 K/W

1997 May 12 8

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and

TDA9817; TDA9818

FM-PLL/AM demodulators

CHARACTERISTICS

=5V; T

peak white level for L); IF input from 50 Ω via broadband transformer 1 : 1; video modulation DSB; residual carrier B/G: 10%; L = 3%; video signal in accordance with Fig.13; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply (pin 21)

Vision IF ampliﬁer (pins 1 and 2)

i(VIF)(rms)

i(max)(rms)

∆V

o(int)

IF(cr)

i(diff)

I(1,2)

True synchronous video demodulator; note 3 f

VCO(max)

∆f

/∆T oscillator drift as a function

osc

∆f

/∆V

osc

VCO(rms)

cr(pc)

∆f

pc(fr)

alg(L accent)

acq

=25°C; see Table 1 for input frequencies and level; input level V

amb

“CCIR, line 17”

supply voltage note 1 4.5 5 5.5 V supply current 76 90 104 mA

input signal voltage sensitivity (RMS value)

maximum input signal voltage (RMS value)

internal IF amplitude difference between picture and sound carrier

B/G standard;

−1 dB video at output B/G standard;

+1 dB video at output within AGC range;

B/G standard;

∆f = 5.5 MHz IF gain control range see Fig.3 65 70 − dB differential input resistance note 2 1.7 2.2 2.7 kΩ differential input

note 2 1.2 1.7 2.5 pF capacitance

DC input voltage note 2 − 3.4 − V

maximum oscillator

f=2f

frequency for carrier regeneration

oscillator is of temperature

free-running; I

AFC

=0;

note 4

oscillator shift as a function of supply voltage

oscillator is

free-running; note 4 oscillator voltage swing at

pins 18 and 19 (RMS value)

picture carrier capture range

B/G, M, N

and L standard

L accent standard;

= 33.9 MHz;

R7= 5.6 kΩ picture carrier frequency

(free-running) accuracy

L accent standard;

fpc= 33.9 MHz;

R7= 5.6 kΩ L accent alignment

frequency range

L accent standard;

AFC

acquisition time BL = 70 kHz; note 5 −−30 ms

i(VIF)(rms)

“NTC-7 Composite”

= 10 mV (sync-level for B/G,

; measurements taken in

− 60 100 µV

120 200 − mV

− 0.7 1 dB

125 130 − MHz

−−±20 × 10−6K

−−±1.5 × 10−3V

50 80 110 mV

±1.4 ±1.8 − MHz

±0.9 ±1.2 − MHz

−±200 ±400 kHz

±400 ±600 − kHz

−1

1997 May 12 9

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and

TDA9817; TDA9818

FM-PLL/AM demodulators

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

i(IF)(rms)

Composite video ampliﬁer (pin 16; sound carrier off)

o(video)(p-p)

V/S ratio between video

∆V

o(video)

sync(16)

clu(16)

cll(16)

o(16)

bias(16)(int)

o(sink)(16)(max)

o(source)(16)(max)

∆V

o(blBG)

∆V

o(blL)

diff

−1

−3

S/N

S/N unweighted signal-to-noise

IF input signal voltage sensitivity for PLL to be

maximum IF gain;

note 6

− 30 70 µV

locked (RMS value; pins 1 and 2)

output signal voltage

see Fig.8 0.97 1.1 1.23 V (peak-to-peak value)

1.9 2.33 3.0 (black-to-white) and sync level

output signal voltage difference

difference between B/G and L standard

−−±12 %

sync voltage level B/G and L standard 1.4 1.5 1.6 V upper video clipping

VP− 1.1 VP− 1 − V

voltage level lower video clipping voltage

− 0.7 0.9 V level

output resistance note 2 −−10 Ω internal DC bias current for

2.2 3.0 − mA emitter-follower

maximum AC and DC

1.6 −−mA output sink current

maximum AC and DC

2.9 −−mA output source current

deviation of CVBS output signal voltage at

50 dB gain control −−0.5 dB 30 dB gain control −−0.1 dB

B/G standard black level tilt in

gain variation; note 7 −−1%

B/G standard vertical black level tilt for

worst case in L standard

vision carrier modulated by test line

−−1.9 %

(VITS) only; gain

variation; note 7 differential gain differential phase

−1 dB video bandwidth B/G and L standard;

“CCIR, line 330”

− 25%

− 1 2 deg

56−MHz CL< 50 pF; RL> 1kΩ; AC load

−3 dB video bandwidth B/G and L standard;

78−MHz CL< 50 pF; RL> 1kΩ; AC load

weighted signal-to-noise

see Fig.5 and note 8 56 60 − dB

ratio

see Fig.5 and note 8 49 53 − dB

ratio

1997 May 12 10

Philips Semiconductors Preliminary speciﬁcation

Single/multistandard VIF/SIF-PLL and

TDA9817; TDA9818

FM-PLL/AM demodulators

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

IM(1.1)

IM(3.3)

∆f

unwanted(p-p)

∆ϕ robustness for modulator

c(rms)

H(sup)

H(spur)

PSRR power supply ripple

intermodulation attenuation at ‘blue’

intermodulation attenuation at ‘yellow’

intermodulation attenuation at ‘blue’

intermodulation attenuation at ‘yellow’

robustness for unwanted frequency deviation of picture carrier (peak-to-peak value)

imbalance

f = 1.1 MHz; see Fig.6 and note 9

f = 3.3 MHz; see Fig.6 and note 9

L standard; residual carrier: 3%; serration pulses: 50%; note 2

L standard; residual carrier: 0%;

58 64 − dB

60 66 − dB

58 64 − dB

59 65 − dB

−−12 kHz

−−3%

serration pulses: 50%; note 2

residual vision carrier (RMS value)

fundamental wave and harmonics; B/G and

− 25mV

L standard

suppression of video

note 10a 35 40 − dB

signal harmonics spurious elements note 10b 40 −−dB

video signal; grey

rejection at pin 16

level; see Fig.11

B/G standard 30 35 − dB L standard 26 30 − dB

VIF-AGC detector (pin 4)

charging current B/G and L standard;

note 7

additional charging current L standard in event of

missing VITS pulses and no white video content

discharging current B/G standard 15 20 25 µA

normal mode L 225 300 375 nA fast mode L 30 40 50 µA

resp

AGC response to an increasing VIF step

AGC response to a decreasing VIF step

B/G and L standard; note 11

B/G standard − 2.2 3.5 ms/dB fast mode L − 1.1 1.8 ms/dB normal mode L;

note 11

∆IF VIF amplitude step for

L standard −2 −6 −10 dB

activating fast AGC mode

1997 May 12 11

0.75 1 1.25 mA

1.9 2.5 3.1 µA

− 0.05 0.1 ms/dB

− 150 240 ms/dB

+ 25 hidden pages