TDA6402 datasheet(2/40 Pages) PHILIPS

2 / 40 page

2000 Jan 24

Philips Semiconductors

Product speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6402; TDA6402A;

TDA6403; TDA6403A

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)

– Extra protocol for 27-bit transmission (test modes 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

• The TDA6402A and TDA6403A differ from the TDA6402

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

programmable 2-band mixers/oscillators and 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 and the VHF band is switched off.

When PUHF is ‘OFF’, the VHF mixer-oscillator is active

and the UHF band is ‘OFF’. PVHFL and PVHFH are used

to select the VHF sub-bands. FMST is a general purpose

port, that can be used to switch an FM sound trap. When

it is used, the sum of the collector currents has to be limited

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.

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