Datasheet
TLV320AIC3110
SLAS647B –DECEMBER 2009–REVISED MAY 2012
www.ti.com
# Noise threshold should be set at higher level if noisy background is present in application
w 30 57 FE # AGC maximum gain= 40 dB
# Higher Max gain is a trade off between gaining up a low sensitivity MIC, and the background
# acoustic noise
# Microphone bias voltage (MICBIAS) level can be used to change the Microphone Sensitivity
w 30 58 50
# Attack time=864/Fs w 30 59 68
# Decay time=22016/Fs
w 30 5A A8
# Noise debounce 0 ms
# Noise debounce time can be increased if needed
w 30 5B 00
# Signal debounce 0 ms
# Signal debounce time can be increased if needed
w 30 5C 00
######################## END of AGC SET UP #################################
5.4.3 Delta-Sigma ADC
The analog-to-digital converter has a delta-sigma modulator with an oversampling ratio (AOSR) up to 128.
The ADC can support a maximum output rate of 192 kHz.
ADC power up is controlled by writing to page 0 / register 81, bit D7. An ADC power-up condition can be
verified by reading page 0 / register 36, bit D6.
5.4.4 ADC Decimation Filtering and Signal Processing
The TLV320AIC3110 ADC channel includes built-in digital decimation filters to process the oversampled
data from the delta-sigma modulator to generate digital data at the Nyquist sampling rate with high
dynamic range. The decimation filter can be chosen from three different types, depending on the required
frequency response, group delay, and sampling rate.
5.4.4.1 ADC Processing Blocks
The TLV320AIC3110 offers a range of processing blocks which implement various signal processing
capabilities along with decimation filtering. These processing blocks give users the choice of how much
and what type of signal processing they may use and which decimation filter is applied.
The choices among these processing blocks allow the system designer to balance power conservation
and signal-processing flexibility. Less signal-processing capability reduces the power consumed by the
device. Table 5-17 gives an overview of the available processing blocks of the ADC channel and their
properties. The resource-class (RC) column gives an approximate indication of power consumption.
The signal processing blocks available are:
• First-order IIR
• Scalable number of biquad filters
• Variable-tap FIR filter
• AGC
The processing blocks are tuned for common cases and can achieve high anti-alias filtering or low group
delay in combination with various signal-processing effects such as audio effects and frequency shaping.
The available first-order IIR, biquad, and FIR filters have fully user-programmable coefficients.
Table 5-17. ADC Processing Blocks
Processing Decimation First-Order Number of Required Resource
Channel FIR
Blocks Filter IIR Available Biquads AOSR Value Class
PRB_R4 Mono A Yes 0 No 128, 64 3
PRB_R5 Mono A Yes 5 No 128, 64 4
PRB_R6 Mono A Yes 0 25-tap 128, 64 4
PRB_R10 Mono B Yes 0 No 64 2
PRB_R11 Mono B Yes 3 No 64 2
28 APPLICATION INFORMATION Copyright © 2009–2012, Texas Instruments Incorporated
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