TDA6509ATT datasheet(3/42 Pages) PHILIPS

3 / 42 page

2005 Mar 25

Philips Semiconductors

Product speciﬁcation

3-band mixer/oscillator and PLL for

terrestrial tuners

TDA6508; TDA6508A;

TDA6509; TDA6509A

FEATURES

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

VCR tuners, DVD-R and PC TV.

• I2C bus protocol compatible with 3.3 V and 5 V

microcontrollers

– Address with 4 data bytes transmission (I2C-bus

‘write’ mode)

– Address with 1 status byte (I2C-bus ‘read’ mode)

– 4 independent I2C-bus addresses.

• 5 Positive-channel Metal Oxide Semiconductor (PMOS)

output ports

– 3 buffers for band selection (20 mA)

– 2 buffers for general purpose, e.g. FM sound trap

(5 mA).

• 33 V tuning voltage output

• In-lock flag

• 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 (20 or 100 µA)

• Balanced mixer with a common emitter input for LOW

band (single input)

• Balanced mixer with a common emitter input for MID

band (balanced input)

• Balanced mixer with a common base input for HIGH

band (balanced input)

• 2-pin asymmetrical oscillator for LOW band

• 2-pin symmetrical oscillator for MID band

• 2-pin symmetrical oscillator for HIGH band

• External 4-pin IF filter between mixer output (medium

impedance) and IF amplifier input (high impedance)

• Weak signal booster (I2C controlled switchable gain

amplifier)

• Low power

• Low radiation

• Small size

• TDA6508; TDA6509: symmetrical IF amplifier output to

drive a SAW filter (1.25 k

Ω)

• TDA6508A; TDA6509A: single-ended IF amplifier to

drive low ohmic load (75

Ω).

APPLICATIONS

• 3-band tuner for terrestrial TV, DVD-R, VCR and PC TV.

GENERAL DESCRIPTION

This device is a programmable 3-band mixer oscillator and

synthesizer intended for LOW, MID and HIGH band TV

and VCR tuners. It has three double balanced mixers and

three oscillators for the LOW, MID and HIGH band

respectively, a PLL synthesizer, and an IF amplifier. There

are four package variants: TDA6508, TDA6509,

TDA6508A and TDA6509A. Versions TDA6508; TDA6509

have a symmetrical IF amplifier; versions TDA6508A;

TDA6509A have an asymmetrical IF amplifier, (see Fig.1).

The common output of all three mixers can be connected,

via two output pins, to an external IF filter to enable

shunted IF bandpass and/or serial filtering for improved

signal handling. Two input pins are available for

connecting the output of the external filter to the input of

the IF amplifier. The mixer output has an impedance

of 300

Ω. The IF amplifier input has an impedance

of 2.5 k

Ω (5 pF).

The overall gain of the tuner can be increased at low signal

amplitude conditions to improve TV reception by activating

a weak signal booster via the I2C-bus.

There are five open-drain PMOS output ports; each port

has a different drive capability. I2C-bus bit P0 enables

port P0 (20 mA drain current) and the LOW band mixer

oscillator. Bit P1 enables port P1 (20 mA drain current)

and the MID band mixer oscillator. When ports P0 and P1

are both disabled, the HIGH band mixer oscillator is

enabled. Bit P2 enables port P2 (20 mA drain current).

Bit P3 enables port P3 (5 mA drain current) for general

use, and bit P4 enables port P4 (5 mA drain current) for

general use, and is also combined with the ADC input.

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

must be limited to 30 mA.

The PLL synthesizer comprises a 15-bit programmable

divider, a crystal oscillator, programmable reference

divider, phase comparator (phase/frequency detector)

combined with a charge-pump which drives an internal

tuning amplifier and an output at pin CP. The CP signal

current can be integrated by connecting an external RC

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