TLC320AD56 datasheet(11/42 Pages) TI1

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1–5

1.5

Terminal Functions

TERMINALS

NAME

NUMBER

I/O

DESCRIPTION

NAME

ALT DATA

Signals on this terminal are routed to DOUT during secondary communication

if phone mode is enabled.

AUXM

Inverting input to auxiliary analog input. AUXM requires an external RC antialias

filter.

AUXP

Noninverting input to auxiliary analog input. Requires an external RC antialias

filter.

AVDD

Analog ADC path supply (5 V only)

DIN

Data input. DIN receives the DAC input data and command information from the

DSP and is synchronized to SCLK.

DOUT

Data output. DOUT transmits the ADC output bits and is synchronized to SCLK.

This terminal is at high-Z when FS is not activated.

DVDD

Digital power supply (5 V or 3 V)

DVSS

Digital ground

Function code. FC is sampled and latched on the rising edge of FS for the primary

serial communication. Refer to the Serial Communications section for more

details.

FLAG 0

Output flag 0. During phone mode, FLAG 0 contains the value set in Control 2

FLAG 1

Output flag 1. During phone mode, FLAG 1 contains the value set in Control 2

FILT

Bandgap filter. FILT is provided for decoupling of the bandgap reference, and

provides 2.5 V to which the analog inputs or outputs can be referenced. The

optimal capacitor value is 0.1

µF (ceramic). This voltage node should be loaded

only with a high-impedance dc load.

Frame sync. When FS goes low, the serial communication port is activated. In

all serial transmission modes, FS is held low during bit transmission. Refer to

section 3 Serial Communications for detailed description.

INM

Inverting input to analog modulator. INM requires an external RC antialias filter.

INP

Noninverting input to analog modulator. INP requires an external RC antialias

filter.

IGAIN

Current gain reference scaling. IGAIN is provided for decoupling of the current

gain reference and provides a 1.35-V reference. The optimal load is a

27-K resistor.

MCLK

Master clock. The master clock derives the internal clocks of the sigma-delta

analog interface circuit.

MONOUT

Monitor output. MONOUT allows for monitoring of the analog input and is a

high-impedance output. The gain or mute is selected using Control 2 register.

OUTM

Inverting current output of the DAC. OUTM is functionally identical with and

complementary to OUTP. OUTM and OUTP current outputs can be loaded with

5 k

Ω differentially or single-ended. This signal can also be used alone for

single-ended operation.

NOTE 1: All digital inputs and outputs are TTL-compatible, unless otherwise noted for DVDD = 5 V.

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