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TDA6503

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

Philips Electronics 

Philips Semiconductors

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

Product specification

TDA6502; TDA6502A;

TDA6503; TDA6503A

1 FEATURES

• Single-chip 5 V mixer/oscillator and synthesizer for

cable TV and VCR tuners

• Pin-to-pin compatible with TDA6402, TDA6402A,

TDA6403 and TDA6403A

• 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 PMOS buffer for UHF band selection (25 mA)

• 3 PMOS 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 analog-to-digital converter (3 bits in I2C-bus

mode)

• 15-bit programmable divider

• Programmable reference divider ratio (64, 80 or 128)

• Programmable charge pump current (60 or 280 µA)

• Varicap drive disable

• 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 able to drive loads from 75 Ω upwards

• Low power

• Low radiation

• Small size

• The TDA6502A and TDA6503A differ from the TDA6502

and TDA6503 by the UHF port protocol in the I2C-bus

mode (see Tables 3 and 4).

2 APPLICATIONS

• Cable tuners for TV and VCR (switched concept for

VHF).

3 GENERAL DESCRIPTION

The TDA6502, TDA6502A, TDA6503 and TDA6503A are

programmable 2-band mixers/oscillators and synthesizers

intended for VHF/UHF TV and VCR tuners (see Fig.1).

Partitioning of the bands is up to the customer as long as

VHF is below 500 MHz and UHF is below 900 MHz.

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.

The port register provides four PMOS ports. Band

selection is provided by port register UHF. When port

register UHF is ‘on’, the UHF mixer-oscillator is active and

the VHF band is switched off. When port register UHF is

‘off’, the VHF mixer-oscillator is active and the UHF band

is off. Port registers VHFL and VHFH are used to select

the VHF sub-bands. Port register FMST is a general

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

When the ports are used, the sum of the drain currents has

to be limited to 30 mA.

The synthesizer consists of a 15-bit programmable divider,

a crystal oscillator and its programmable reference divider

and a phase comparator (phase/frequency detector)

combined with a charge pump which drives the tuning

amplifier, including the 33 V output at pin VT. Depending

on the reference divider ratio (64, 80 or 128), the phase

comparator operates at 62.5, 50 or 31.25 kHz with a

4 MHz crystal.

2001 Aug 22

3

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