TDA8295 datasheet(8/77 Pages) NXP

8 / 77 page

TDA8295_1

Product data sheet

Rev. 01 — 4 February 2008

8 of 77

NXP Semiconductors

TDA8295

Digital global standard low IF demodulator for analog TV and FM radio

7.2 Pin description

GPIO2/SDA_O

GPIO1/SCL_O

GPIO0/VSYNC

VDDDR(3V3)

VSSDR

i.c.

IF_AGC

i.c.

VDDD(ADC)(3V3)

VSSA(ADC)

Table 3.

Pin allocation table …continued

Symbol

Table 4.

Pin description

Symbol

Type[1][2]

Description

Reset

RST_N

The RST_N input is asynchronous and active LOW, and clears the TDA8295.

When RST_N goes LOW, the circuit immediately enters its Reset mode and

normal operation will resume four XIN signal falling edges later after RST_N

returns HIGH. Internal register contents are all initialized to their default values.

The minimum width of RST_N at LOW level is four XIN clock periods.

Reference

XIN

Crystal oscillator input pin. In Slave mode (typically), the XIN input simply

receives a 16 MHz clock signal from an external device (typically from the

TDA8275A or TDA1827x). In Oscillator mode, a fundamental 16 MHz (typically)

crystal is connected between pin XIN and pin XOUT.

XOUT

Crystal oscillator output pin. In Slave mode, the XOUT output is not connected.

In Oscillator mode a fundamental 16 MHz (typically) crystal is connected

between pin XIN and pin XOUT.

I2C-bus

SDA

I/O, OD

I2C-bus bidirectional serial data. SDA is an open-drain output and therefore

requires an external pull-up resistor (typically 4.7 k

Ω).

SCL

I2C-bus clock input. SCL is nominally a square wave with a maximum frequency

of 400 kHz. It is generated by the system I2C-bus master.

SADDR0

These two bits allow to select four possible I2C-bus addresses, and therefore

permits to use several TDA8295 in the same application and/or to avoid conﬂict

with other ICs. The complete I2C-bus address is: 1, 0, 0, SADDR1, 0, 1,

SADDR0 (see also Section 9.1).

SADDR1

I2C-bus feed-through switch or GPIO

GPIO2/SDA_O

I/O, OD

SDA_O is equivalent to SDA but can be 3-stated by I2C-bus programming. It is

the output of a switch controlled by I2CSW_EN parameter. SDA_O is an

open-drain output and therefore requires an external pull-up resistor

(see Section 9.3.20).

GPIO1/SCL_O

I/O, OD

SCL_O is equivalent to SCL input but can be 3-stated by I2C-bus programming.

SCL_O is an open-drain output and therefore requires an external pull-up

resistor (see Section 9.3.20). For proper functioning of the I2C-bus feed-through,

a capacitor C = 33 pF to GND must be added (see Section 13.6).

V-sync or GPIO

GPIO0/VSYNC

I/O, OD

vertical synchronization pulse needed for the NXP Silicon Tuner

(see Section 9.3.20)

Tuner IF AGC

IF_AGC

I/O, OD, T tuner IF AGC output

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