GC2011A datasheet(38/50 Pages) TI

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Texas Instruments Incorporated

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GC2011A 3.3V DIGITAL FILTER CHIP

SLWS129A

This document contains information which may be changed at any time without notice

6.6

OUTPUT MODE REGISTER

The output mode register controls the output formatting.

ADDRESS 7:

OUTPUT_REG

BIT

TYPE

NAME

DESCRIPTION

0,1 (LSBs)

R/W

NEG_OUT

This two bit field controls the output sample negation as follows:

NEG_OUT

DESCRIPTION

don’t negate

negate full rate output samples

negate half rate output samples

negate quarter rate output samples

When negation is enabled the circuit will negate the even time A-Path

outputs and the odd time B-path outputs where the definition of even and

odd time samples is shown in Figure 8. If the user desires to negate the

odd time A-path outputs, or negate the even time B-path outputs, then

the NEG_IN control should be used to negate the path’s input.

R/W

24BIT_MODE

Enables the 24 bit mode. PATH_ADD and 24BIT_OUT must also be set

in this register. A-path and B-path must be configured the same except

for:

B-path must be in the unsigned mode,

A-path CIN must be zero,

A-path AB_SEL is 1, and

B-path AB_SEL is 0.

R/W

24BIT_OUT

Enables the 24 bit output mode. The 24 bit B-path output samples are

output on the A-out and B-out pins as follows: The upper 16 bits are

output on the A-out pins, the lower 8 bits are output on the upper 8 bits

of the B-out pins.

4,5

R/W

MUX_MODE

In the MUX_MODE the A-path and B-path outputs are multiplexed

together on the A-out pins. The B-out pins are cleared. The MUX_MODE

settings are:

MUX_MODE

DESCRIPTION

mux mode is off,

mux half rate outputs,

mux quarter rate outputs

The multiplexed half rate outputs will generate a full rate output stream,

the multiplexed quarter rate outputs will generate a half rate stream. The

A-path sample is output first, followed by the B-path sample.

R/W

PATH_ADD

Adds the A-path and B-path results. The result is output on the B-out pins

unless the 24BIT_OUT control is enabled.

R/W

DAV_POLARITY

Invert the polarity of the data valid (DAV) strobe. Figure 8 shows

DAV with DAV_POLARITY = 0.

8-15

R/W

unused

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