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PCM1870 Datasheet(PDF) 42 Page - Texas Instruments

Part # PCM1870
Description  16-Bit Low-Power Stereo Audio ADC With Microphone Bias and Microphone Amplifier
PDF  52 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCM1870 Datasheet(HTML) 42 Page - Texas Instruments

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f
S + Sampling frequency [Hz]
f
C + Center frequency [Hz]
a
1 + * 1 ) a2 cos
2pf
C
f
S
a
2 +
1
* tan
2pf
b
f
S
2
1
) tan
2pf
b
f
S
2
f
b + Bandwidth [Hz]
PCM1870
SLAS544A – MAY 2007 – REVISED SEPTEMBER 2007
Calculating Filter Coefficients
The PCM1870 provides a dual-stage notch filter at the digital output of the ADC. The filter characteristics of each
filter stage can be programmed. The characteristics are determined by calculating coefficients for three
parameters, sampling frequency, center frequency and bandwidth, as shown in the following equations. All
coefficients must be written as 2s-complement binary data into registers 97, 98, 99, 100, 101, 102, 103, and 104.
Register 124
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 124
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RSV
RSV
RSV
RSV
RSV
RSV
G12R
G12L
IDX[6:0]: 111 1100b (7Ch) Register 124
G12R: 12-dB Boost for PG2 (Gain Amplifier for AIN1R and AIN2R)
G12L: 12-dB Boost for PG1 (Gain Amplifier for AIN1L and AIN2L)
Default value: 0
These bits are used to boost the microphone signal when the analog input is small. See Register 90 for the
detailed settings.
42
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): PCM1870



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