Datasheet

TLV320AIC3100
www.ti.com SLAS667A –NOVEMBER 2009–REVISED MAY 2012
Mode B
To choose mode B, page 0 / register 102, bit D5 must be programmed to 1. In dc-measurement mode B,
a first-order IIR filter is used. The coefficients of this filter are determined by D, page 0 / register 102,
bits D4–D0. The nature of the filter is given in Table 5-24.
Table 5-24. DC Measurement Bandwidth Settings
D: Page 0 / Register 102, Bits D4–D0 –3 dB BW (Hz) –0.5 dB BW (Hz)
1 688,440 236,500
2 275,970 96,334
3 127,400 44,579
4 61,505 21,532
5 30,248 10,590
6 15,004 5,253
7 7,472 2,616
8 3,729 1,305
9 1,862 652
10 931 326
11 465 163
12 232.6 81.5
13 116.3 40.7
14 58.1 20.3
15 29.1 10.2
16 14.54 5.09
17 7.25 2.54
18 3.63 1.27
19 1.8 0.635
20 0.908 0.3165
By programming page 0 / register 103, bit D5 to 1, the averaging filter is periodically reset after 2
R
number
of ADC_MOD_CLK periods, where R is programmed in page 0 / register 103, bits D4–D0. When page 0 /
register 103, bit D5 is set to 1, then the value of D should be less than the value of R. When page 0 /
register 103, bit D5 is programmed to 0, the averaging filter is never reset.
5.5 Audio DAC and Audio Analog Outputs
Each channel of the stereo audio DAC consists of a digital audio processing block, a digital interpolation
filter, a digital delta-sigma modulator, and an analog reconstruction filter. This high oversampling ratio
(normally DOSR is between 32 and 128) exhibits good dynamic range by ensuring that the quantization
noise generated within the delta-sigma modulator stays outside of the audio frequency band. Audio analog
outputs include stereo headphone/lineouts and mono class-D speaker outputs.
5.5.1 DAC
The TLV320AIC3100 stereo audio DAC supports data rates from 8 kHz to 192 kHz. Each channel of the
stereo audio DAC consists of a signal-processing engine with fixed processing blocks, a digital
interpolation filter, multibit digital delta-sigma modulator, and an analog reconstruction filter. The DAC is
designed to provide enhanced performance at low sampling rates through increased oversampling and
image filtering, thereby keeping quantization noise generated within the delta-sigma modulator and signal
Copyright © 2009–2012, Texas Instruments Incorporated APPLICATION INFORMATION 43
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