Philips tda6402, tda6403 a DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA6402; TDA6402A; TDA6403; TDA6403A

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Product speciﬁcation Supersedes data of 1998 Jul 28 File under Integrated Circuits, IC02

2000 Jan 24

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

FEATURES

• Single-chip 5 V mixer/oscillator and synthesizer for cable TV and VCR tuners

• Synthesizer function compatible with existing TSA5526

• Universal bus protocol (I2C-bus or 3-wire bus)

– Bus protocol for 18 or 19-bit transmission (3-wire

bus)

– Extraprotocolfor 27-bit transmission(testmodes and

features for 3-wire bus)

– Address + 4 data bytes transmission (I2C-bus ‘write’

mode) – Address + 1 status byte (I2C-bus ‘read’ mode) – 4 independent I2C-bus addresses.

• 1 PNP buffer for UHF band selection (25 mA)

• 3 PNP buffers for general purpose, e.g. 2 VHF

sub-bands, FM sound trap (25 mA)

• 33 V tuning voltage output

• In-lock detector

• 5-step A/D converter (3 bits in I2C-bus mode)

• 15-bit programmable divider

• Programmable reference divider ratio (512, 640 or

1024)

• Programmable charge pump current (60 or 280 µA)

• Programmable automatic charge pump current switch

• Varicap drive disable

• Mixer/oscillator function compatible with existing

TDA5732

• Balanced mixer with a common emitter input for VHF (single input)

• Balanced mixer with a common base input for UHF (balanced input)

• 2-pin common emitter oscillator for VHF

• 4-pin common emitter oscillator for UHF

• IF preamplifier with asymmetrical 75 Ω output impedance to drive a low-ohmic impedance (75 Ω)

• Low power

• Low radiation

• Small size

• TheTDA6402A andTDA6403Adifferfrom theTDA6402

and TDA6403 by the UHF port protocol in the I2C-bus mode (see Tables 3 and 4).

APPLICATIONS

• Cable tuners for TV and VCR (switched concept for VHF)

• Recommended RF bands for the USA:

55.25 to 133.25 MHz, 139.25 to 361.25 MHz and

367.25 to 801.25 MHz.

GENERAL DESCRIPTION

The TDA6402, TDA6402A, TDA6403 and TDA6403A are programmable2-band mixers/oscillatorsand synthesizers intended for VHF/UHF cable tuners (see Fig.1).

The devices include two double balanced mixers and two oscillators for the VHF and UHF band respectively, an IF amplifier and a PLL synthesizer. The VHF band can be split-up into two sub-bands using a proper oscillator application and a switchable inductor. Two pins are available between the mixer output and the IF amplifier input to enable IF filtering for improved signal handling. Four PNP ports are provided. Band selection is provided by using pin PUHF. When PUHF is ‘ON’, the UHF mixer-oscillator is active andthe VHFband isswitched off. When PUHF is ‘OFF’, the VHF mixer-oscillator is active and the UHF band is ‘OFF’. PVHFL and PVHFH areused to select the VHF sub-bands. FMST is a general purpose port, that can be used to switch an FM sound trap. When itis used,thesum ofthe collector currentshas tobelimited to 30 mA.

The synthesizer consists of a divide-by-eight prescaler, a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and a phase/frequency detector combined with a charge pump which drives the tuning amplifier, including 33 V output (V33) at pin VT.

Depending on the reference divider ratio (512, 640 or

1024), the phase comparator operates at 7.8125 kHz,

6.25 kHz or 3.90625 kHz with a 4 MHz crystal.

TDA6402; TDA6402A;

TDA6403; TDA6403A

2000 Jan 24 2

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

The device can be controlled according to the I2C-bus format or 3-wire bus format depending on the voltage applied to pin SW (see Table 2). In the 3-wire bus mode (SW = HIGH), pin LOCK/ADC is the LOCK output. The LOCK output is LOW when the PLL loop is locked. In the I2C-bus mode(SW = LOW), the lockdetector bit FL is set tologic 1 when the loop is locked and is read on the SDA line (Status Byte; SB) during a READ operation in I2C-bus mode only. The Analog-to-Digital Converter (ADC) input isavailable on pin LOCK/ADC for digitalAFC control in the I2C-bus mode only. The ADC code is read during a READ operation on the I2C-bus (see Table 11). In test mode,pin LOCK/ADC isused as aTEST outputfor f

and1⁄2f

REF

(see Table 7). When the automatic charge pump current switch mode is

activated and when the loop is phase-locked, the charge pumpcurrent valueisautomatically switchedto LOW.This action is taken to improve the carrier-to-noise ratio. The status of this feature can be read in the ACPS flag during a READ operation on the I2C-bus (see Table 9).

,in bothI2C-busmode and3-wirebus mode

DIV

TDA6402; TDA6402A;

TDA6403; TDA6403A

C-bus mode (SW = GND)

Five serial bytes (including address byte) are required to address the device, select the VCO frequency, program the four ports, set the charge pump current and set the reference divider ratio. The device has four independent I2C-bus addresses which can be selected by applying a specific voltage on input CE (see Table 6).

3-wire bus mode (SW = OPEN or VCC)

Data is transmitted to the devices during a HIGH-level on inputCE (enableline). The deviceis compatiblewith 18-bit and19-bit dataformats,as showninFigs 4 and 5. Thefirst four bits are used to program the PNP ports and the remaining bits control the programmable divider. A 27-bit data format may also be used to set the charge pump current, the reference divider ratio and for test purposes (see Fig.6).

It is not allowed to address the devices with words whose length is different from 18, 19 or 27 bits.

Table 1 Data word length for 3-wire bus

(1)

TYPE NUMBER DATA WORD REFERENCE DIVIDER

TDA6402; TDA6402A; TDA6403; TDA6403A 18-bit 512 62.50 kHz TDA6402; TDA6402A; TDA6403; TDA6403A 19-bit 1024 31.25 kHz TDA6402; TDA6402A; TDA6403; TDA6403A 27-bit programmable programmable

Note

1. The selectionof the referencedivider is givenby an automaticidentification of thedata word length.When the 27-bit format is used, the reference divider is controlled by RSA and RSB bits (see Table 8). More details are given in Chapter “PLL functional description”, Section “3-wire bus mode (SW = OPEN or V

)”.

FREQUENCY STEP

2000 Jan 24 3

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

TDA6402; TDA6402A;

TDA6403; TDA6403A

QUICK REFERENCE DATA

Measured over full voltage and temperature ranges; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

XTAL

o(PNP)

tot

stg

amb

supply voltage operating 4.5 5 5.5 V supply current all PNP ports are ‘OFF’ − 71 − mA crystal oscillator input frequency 3.2 4.0 4.48 MHz PNP port output current note 1 −−30 mA total power dissipation note 2 −−490 mW IC storage temperature −40 − +150 °C ambient temperature −20 − +85 °C RF frequency VHF band 55.25 − 361.25 MHz

UHF band 367.25 − 801.25 MHz

voltage gain VHF band − 19 − dB

UHF band − 29 − dB

NF noise ﬁgure VHF band − 8.5 − dB

UHF band − 9 − dB

output voltage causing 1% cross modulation in channel

VHF band − 108 − dBµV UHF band − 108 − dBµV

Notes

1. One buffer ‘ON’, Io= 25 mA; two buffers ‘ON’, maximum sum of Io= 30 mA.

2. The power dissipation is calculated as follows:

tot

CCICCIo

–()V

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA6402M;

SSOP28 plastic shrink small outline package; 28 leads; body width 5.3 mm SOT341-1

TDA6402AM TDA6403M;

SSOP28 plastic shrink small outline package; 28 leads; body width 5.3 mm SOT341-1

TDA6403AM

CE(sat PNP)Io



V33

-- -



+×+×=

----------------------22 kΩ

2000 Jan 24 4

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

BLOCK DIAGRAM

handbook, full pagewidth

VHFIN

RFGND

UHFIN1

UHFIN2

3 (26)

4 (25)

1 (28) 2 (27)

RF INPUT

VHF

TDA6402

TDA6402A

TDA6403

TDA6403A

RF INPUT

UHF

IFFIL1 IFFIL2

5 (24)

6 (23)

BSBS

VHF

MIXER

UHF

MIXER

19 (10)

TDA6402; TDA6402A;

TDA6403; TDA6403A

(5) 24

VHF

OSCILLATOR

PREAMPLIFIER

UHF

OSCILLATOR

(7) 22 (6) 23

(9) 20

(1) 28 (2) 27 (3) 26 (4) 25

VHFOSCOC

VHFOSCIB OSCGND

IFOUT

UHFOSCIB2 UHFOSCOC2 UHFOSCOC1 UHFOSCIB1

XTAL

CE/AS

18 (11)

14 (15) 13 (16) 11 (18)

12 (17)

XTAL

OSCILLATOR

4 MHz

PRESCALER DIVIDE BY 8

POWER-DOWN

DETECTOR

SCL

SDA

C / 3-WIRE BUS TRANSCEIVER

CE/AS

3-BIT A/D

CONVERTER

PRESCALER

DIVIDE BY

512, 640, 1024

RSA RSB

15-BIT

PROGRAMMABLE

DIVIDER

15-BIT

FREQUENCY

REF

COMPARATOR

DIV

IN LOCK

DETECTOR

REF

1/2f

GATE

15 (14)

LOCK/ADC

PHASE

DIV

T0, T1, T2

CHARGE

PUMP

T0, T1, T2 CP

CP T2 T1 T0 RSA RSB OS

UHF VHFH VHFL FMST

9 (20)

PUHF

CONTROL

PORT

8 (21)

PVHFH

OPAMP

7 (22)

PVHFL

FMST

10 (19)

(13) 16

(12) 17

(8) 21

MGE692

GND

The pin numbers in parenthesis represent the TDA6403 and TDA6403A.

Fig.1 Block diagram.

2000 Jan 24 5

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

PINNING

SYMBOL

UHFIN1 1 28 UHF RF input 1 UHFIN2 2 27 UHF RF input 2 VHFIN 3 26 VHF RF input RFGND 4 25 RF ground IFFIL1 5 24 IF ﬁlter output 1 IFFIL2 6 23 IF ﬁlter output 2 PVHFL 7 22 PNP port output, general purpose (e.g. VHF low sub-band) PVHFH 8 21 PNP port output, general purpose (e.g. VHF high sub-band) PUHF 9 20 PNP port output, UHF band FMST 10 19 PNP port output, general purpose (e.g. FM sound trap) SW 11 18 bus mode selection input (I CE/AS 12 17 Chip Enable/Address Selection input DA 13 16 serial data input/output CL 14 15 serial clock input LOCK/ADC 15 14 lock detector output (3-wire bus)/ADC input (I CP 16 13 charge pump output VT 17 12 tuning voltage output XTAL 18 11 crystal oscillator input V

IFOUT 20 9 IF output GND 21 8 digital ground VHFOSCIB 22 7 VHF oscillator input base OSCGND 23 6 oscillator ground VHFOSCOC 24 5 VHF oscillator output collector UHFOSCIB1 25 4 UHF oscillator input base 1 UHFOSCOC1 26 3 UHF oscillator output collector 1 UHFOSCOC2 27 2 UHF oscillator output collector 2 UHFOSCIB2 28 1 UHF oscillator input base 2

TDA6402;

TDA6402A

19 10 supply voltage

TDA6403;

TDA6403A

TDA6402; TDA6402A;

TDA6403; TDA6403A

DESCRIPTION

C-bus/3-wire bus)

C-bus)

2000 Jan 24 6

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

handbook, halfpage

UHFIN1 UHFIN2

VHFIN

RFGND

IFFIL1 IFFIL2

PVHFL

PVHFH

PUHF FMST

CE/AS

DA CL

1 2 3 4 5 6 7

TDA6402A

9 10 11 12 13

TDA6402

MGE690

UHFOSCIB2

UHFOSCOC2

UHFOSCOC1

UHFOSCIB1

VHFOSCOC

24 23

OSCGND VHFOSCIB

22 21

GND IFOUT

XTAL

16 1514

LOCK/ADC

handbook, halfpage

UHFOSCIB2 UHFOSCOC2 UHFOSCOC1

UHFOSCIB1

VHFOSCOC

VHFOSCIB

LOCK/ADC

OSCGND

GND

IFOUT

XTAL

TDA6402; TDA6402A;

TDA6403; TDA6403A

1 2 3 4 5 6 7

TDA6403A

9 10 11 12 13

TDA6403

MGE691

28 27 26 25 24 23 22 21

20 19 18 17 16 1514

UHFIN1 UHFIN2 VHFIN RFGND IFFIL1 IFFIL2 PVHFL PVHFH PUHF FMST SW CE/AS DA CL

Fig.2 Pin configurationfor TDA6402 and

TDA6402A.

PLL FUNCTIONAL DESCRIPTION

The device is controlled via the I2C-bus or the 3-wire bus, depending on the voltage applied on the SW input. A HIGH-level on the SW input enables the 3-wire bus;

and clock inputs respectively. A LOW-level on SW input enables the I2C-bus; the CE/AS, DA and CL inputs are used as address selection (AS), SDA and SCL input respectively (see Table 2).

Fig.3 Pin configurationfor TDA6403 and

TDA6403A.

CE/AS, DA and CL inputs are used as enable (CE), data

Table 2 Bus mode selection

SYMBOL

TDA6402;

TDA6402A

TDA6403;

TDA6403A

3-WIRE BUS MODE I2C-BUS MODE

SW 11 18 HIGH-level or OPEN LOW-level or GND CE/AS 12 17 enable input address selection input DA 13 16 data input serial data input CL 14 15 clock input serial clock input LOCK/ADC 15 14 LOCK/TEST output ADC input/TEST output

2000 Jan 24 7

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

I2C-bus mode (SW = GND)

WRITE MODE; R/W = 0 (see Tables 3 and 4) Data bytes can be sent to the device after the address

transmission (first byte). Four data bytes are needed to fully program the device. The bus transceiver has an auto-increment facility which permits the programming of the device within one single transmission (address + 4 data bytes).

The device can also be partially programmed providing that the first data byte following the address is divider byte 1 (DB1) or control byte (CB). The bits in the data bytes aredefined inTables 3 and 4. The firstbit ofthe first data byte transmitted indicates whether frequency data (first bit = 0) or control and band-switch data (first bit = 1) will follow.Until an I2C-bus STOPcommand is sent by the

Table 3 I2C-bus data format, ‘write’ mode for the TDA6402 and TDA6403

NAME BYTE

MSB LSB

Address byte ADB 11000MA1MA0R/W=0A Divider byte 1 DB1 0 N14 N13 N12 N11 N10 N9 N8 A Divider byte 2 DB2 N7 N6 N5 N4 N3 N2 N1 N0 A Control byte CB 1 CP T2 T1 T0 RSA RSB OS A Band-switch byte BB XXXXFMST PUHF PVHFH PVHFL A

controller,additional databytes canbe entered withoutthe need to re-address the device. The frequency register is loaded after the8th clock pulse of thesecond divider byte (DB2), the control register is loaded after the 8th clock pulse ofthe controlbyte (CB)and theband-switch register is loaded after the 8th clock pulse of the band switch byte (BB).

I2C-BUS ADDRESS SELECTION The moduleaddress contains programmableaddress bits

(MA1 and MA0) which offer the possibility of having several synthesizers(up to 4) inone system byapplying a specific voltageon theCE input.The relationshipbetween MA1 and MA0 and the input voltage applied to the CE input is given in Table 6.

BITS

TDA6402; TDA6402A;

TDA6403; TDA6403A

ACK

Table 4 I

2000 Jan 24 8

C-bus data format, ‘write’ mode for the TDA6402A and TDA6403A

NAME BYTE

MSB LSB

BITS

ACK

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Table 5 Description of symbols used in Tables 3 and 4

SYMBOL DESCRIPTION

A acknowledge MA1, MA0 programmable address bits (see Table 6) N14 to N0 programmable divider bits; N = N14 × 2 CP charge pump current:

CP=0=60µA

CP = 1 = 280 µA (default) T2, T1,T0 test bits (see Table 7) RSA, RSB reference divider ratio select bits (see Table 8) OS tuning ampliﬁer control bit:

OS = 0; normal operation; tuning voltage is ‘ON’ (default)

OS = 1; tuning voltage is ‘OFF’ (high-impedance) PVHFL, PVHFH, PUHF, FMST PNP ports control bits:

bit = 0; buffer n is ‘OFF’ (default)

bit = 1; buffer n is ‘ON’ X don’t care

+ N13 × 213+ ... + N1 × 21+N0

TDA6402; TDA6402A;

TDA6403; TDA6403A

Table 6 Address selection (I

C-bus mode)

MA1 MA0 VOLTAGE APPLIED ON CE INPUT (SW = GND)

0 0 0Vto0.1×V 0 1 open or 0.2 × VCCto 0.3 × V 1 0 0.4 × VCCto 0.6 × V 1 1 0.9 × VCCto 1.0 × V

CC CC CC

Table 7 Test modes

T2 T1 T0 TEST MODES

0 0 0 automatic charge pump switched off 0 0 1 automatic charge pump switched on (note 1) 0 1 X charge pump is ‘OFF’ 1 1 0 charge pump is sinking current 1 1 1 charge pump is sourcing current 100f 101

is available on pin LOCK/ADC (note 2)

REF

⁄

is available on pin LOCK/ADC (note 2)

DIV

Notes

1. This is the default mode at power-on reset.

2. The ADCinput cannot beused when these testmodes are active;see Section “Read mode;R/W = 1 (see Table 9)” for more information.

2000 Jan 24 9

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Table 8 Reference divider ratio select bits

RSA RSB REFERENCE DIVIDER RATIO FREQUENCY STEP (kHz)

(1)

0 1 1024 3.90625 1 1 512 7.8125

Note

1. X = don’t care.

READ MODE; R/W = 1 (see Table 9) Data canbe read from the device by settingthe R/W bit to

logic 1. After the slave address has been recognized, the device generates an acknowledge pulse and the first data byte (status byte) is transferred on the SDA line (MSB first). Data is valid on the SDA line during a HIGH-level of theSCL clocksignal. Asecond databyte canbe readfrom the device if the microcontroller generates an acknowledge on the SDA line (master acknowledge). End of transmission will occur if no master acknowledge occurs. The device will then release the data line to allow the microcontroller to generate a STOP condition. The PORflag isset to logic 1at power-on.Theflag isreset when an end-of-data is detected by the device (end of a

0 640 6.25

TDA6402; TDA6402A;

TDA6403; TDA6403A

READ sequence). Control of the loop is made possible with the in-lock flag FL which indicates when the loop is locked (FL = 1).

The automatic charge pump switch flag (ACPS) is LOW when theautomatic chargepump switchmode is ‘ON’ and the loop is locked. In other conditions, ACPS = 1. When ACPS = 0, thecharge pump currentis forced to the LOW value.

A built-in ADC is available on LOCK/ADC pin (I2C-bus mode only). This converter can be used to apply AFC informationto themicrocontroller fromthe IFsection ofthe television.The relationshipbetween thebitsA2, A1andA0 is given in Table 11.

Table 9 Read data format

NAME BYTE

Address byte ADB 11000MA1MA0R/W=1A Status byte SB POR FL ACPS 1 1 A2 A1 A0 −

Note

1. MSB is transmitted first.

Table 10 Description of symbols used in Table 9

SYMBOL DESCRIPTION

A acknowledge POR power-on reset ﬂag (POR = 1 at power-on) FL in-lock ﬂag (FL = 1 when the loop is locked) ACPS automatic charge pump switch ﬂag:

ACPS = 0; active ACPS = 1; not active

A2, A1, A0 digital outputs of the 5-level ADC

MSB

(1)

BITS

ACK

LSB

2000 Jan 24 10

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Table 11 A to D converter levels (note 1)

A2 A1 A0 VOLTAGE APPLIED ON ADC INPUT

1 0 0 0.60 × VCCto 1.00 × V 0 1 1 0.45 × VCCto 0.60 × V 0 1 0 0.30 × VCCto 0.45 × V 0 0 1 0.15 × VCCto 0.30 × V 0 0 0 0 to 0.15 × V

Note

1. Accuracy is ±0.03 × V

POWER-ON RESET

Table 12 Default bits at power-on reset

NAME BYTE

Address byte ADB 1 1 0 0 0 MA1 MA0 X Divider byte 1 DB1 0 XXXXXXX Divider byte 2 DB2 XXXXXXXX Control byte CB 1 1 0 0 1 X 1 1 Band switch byte BB XXXX0000

MSB LSB

BITS

TDA6402; TDA6402A;

TDA6403; TDA6403A

CC CC CC CC

The power-on detection threshold voltage V VCC= 2 V at room temperature. Below this threshold, the device is reset to the power-on state.

At power-on state, the charge pump current is set to 280 µA, the tuning voltage outputis disabled, the test bits T2, T1 and T0 are set to ‘001’ (automatic charge pump switch ‘ON’) and RSB is set to logic 1.

PUHF is ‘OFF’, which means that the UHF oscillator and the UHF mixer are switched off. Consequently, the VHF oscillator andthe VHF mixer areswitched on. PVHFL and PVHFH are ‘OFF’, which means that the VHF tank circuit is working in the VHF I sub-band. The tuning amplifier is switched off until the first transmission. In that case, the tank circuit in VHF I is supplied with the maximum tuning voltage. The oscillator is therefore working at the end of the VHF I sub-band.

3-wire bus mode (SW = OPEN or VCC)

Duringa HIGH-levelon theCEinput (enableline), thedata is clocked into the data register at the HIGH-to-LOW transition of the clock. The first four bits control the PNP ports and areloaded into the internal band switchregister on the 5th rising edge of the clock pulse. The frequency

POR

is set to

bits are loaded into the frequency register at the HIGH-to-LOW transition of the chip enable line when an 18-bit or 19-bit data word is transmitted(see Figs 4 and 5).

When a27-bit data word istransmitted, the frequency bits are loaded into the frequency register on the 20th rising edge of the clock pulse and the control bits at the HIGH-to-LOWtransition ofthechip enableline (seeFig.6). Inthis mode,the referencedivider isgiven bythe RSA and RSB bits (see Table 8). The test bits T2, T1 and T0, the charge pump bit CP, the ratio select bit RSB and the OS bit can only be selected or changed with a 27-bit transmission. They remain programmed if an 18-bit or 19-bit transmission occurs. Only RSA is controlled by the transmission length when the 18-bit or 19-bit format is used. When an 18-bit data word is transmitted, the most significant bit of the divider N14 is internally set to logic 0 and the RSA bit is set to logic 1. When a 19-bit data word is transmitted, the RSA bit is set to logic 0.

A data word of less than 18 bits will not affect the frequency register of the device. The definition of the bits is unchanged compared to I2C-bus mode.

It is not allowed to address the devices with words whose length is different from 18, 19 or 27 bits.

2000 Jan 24 11

Philips Semiconductors Product speciﬁcation

5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

POWER-ON RESET The power-on detection threshold voltage V

VCC= 2 V at room temperature. Below this threshold, the device is reset to the power-on state.

PUHF is ‘OFF’, which means that the UHF oscillator and the UHF mixer are switched off. Consequently, the VHF oscillator andthe VHF mixer areswitched on. PVHFL and

handbook, full pagewidth

INVALID

DATA

BAND SWITCH

DATA

FMST

PUHF

PVHFL

PVHFH

N13 N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1 N0

POR

is set to

TDA6402; TDA6402A;

TDA6403; TDA6403A

PVHFH are ‘OFF’, which means that the VHF tank circuit is working in the VHF I sub-band. The tuning amplifier is switched off until the first transmission. In that case, the tank circuit in VHF I is supplied with the maximum tuning voltage. The oscillator is therefore working at the end of the VHF I sub-band.

If the first sequence transmitted to the device has 18 or 19 bits, the reference divider ratio is set to 512 or 1024, depending on the sequence length. If the sequence has 27 bits, the reference divider ratio is fixed by RSA and RSB bits (see Table 8).

FREQUENCY

DATA

INVALID

DATA

145 18

LOAD BAND SWITCH

LOAD FREQUENCY

Fig.4 Normal mode; 18-bit data format (RSA = 1).

MGE693

2000 Jan 24 12

+ 28 hidden pages