GC2011A Datasheet, PDF (38/50 Pages) Texas Instruments – 3.3V DIGITAL FILTER CHIP

GC2011A 3.3V DIGITAL FILTER CHIP
SLWS129A
6.6 OUTPUT MODE REGISTER
The output mode register controls the output formatting.
ADDRESS 7:
BIT
0,1 (LSBs)
OUTPUT_REG
TYPE
NAME
R/W
NEG_OUT
2
R/W
24BIT_MODE
3
R/W
4,5
R/W
24BIT_OUT
MUX_MODE
6
R/W
7
R/W
8-15
R/W
PATH_ADD
DAV_POLARITY
-
DESCRIPTION
This two bit field controls the output sample negation as follows:
NEG_OUT
DESCRIPTION
0
don’t negate
1
negate full rate output samples
2
negate half rate output samples
3
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.
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.
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.
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
0
mux mode is off,
1
mux half rate outputs,
3
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.
Adds the A-path and B-path results. The result is output on the B-out pins
unless the 24BIT_OUT control is enabled.
Invert the polarity of the data valid (DAV) strobe. Figure 8 shows
DAV with DAV_POLARITY = 0.
unused
Texas Instruments Incorporated
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