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参数资料
型号： TLV320AIC3111IRHBT
厂商： TEXAS INSTRUMENTS INC
元件分类： 音频／视频放大
英文描述： AUDIO AMPLIFIER, PQCC32
封装： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件页数： 92/156页
文件大小： 1701K
代理商： TLV320AIC3111IRHBT
Mono ADC
CIC Filter
Signal
Processing
Blocks
MISO
SDIN
ADC_MOD_CLK
D
IG_MIC_IN
DOUT
D S
-
ADC
MonoData
NoData
MonoData
NoData
MonoData
NoData
ADC_MOD_CLK
DIG_MIC_IN
TLV320AIC3111
SLAS644B – JULY 2009 – REVISED OCTOBER 2009
www.ti.com
Figure 5-17. Digital Microphone in the TLV320AIC3111
The TLV320AIC3111 outputs internal clock ADC_MOD_CLK on the GPIO1 pin (page 0 / register 51,
bits D5–D2 = 1010). This clock can be connected to the external digital microphone device. The single-bit
output of the external digital microphone device can be connected to the DIN pin. Internally, the
TLV320AIC3111 latches the steady value of the mono ADC data on the rising edge of ADC_MOD_CLK.
Figure 5-18. Timing Diagram for Digital Microphone Interface
When the digital microphone mode is enabled, the analog section of the ADC can be powered down and
bypassed for power efficiency. The AOSR value for the ADC channel must be configured to select the
desired decimation ratio to be achieved, based on the external digital microphone properties.
5.5.7
DC Measurement
The TLV320AIC3111 supports a highly flexible dc-measurement mode using the high-resolution
oversampling and noise-shaping ADC. This mode can be used when the ADC channel is not used for the
voice/audio record function. This mode can be enabled by programming page 0 / register 102, bit D7. The
converted data is 24 bits, using the 2.22 numbering format. The value of the converted data for the ADC
channel can be read back from page 0 / register 104 through page 1 / register 106. Before reading back
the converted data, page 0 / register 103, bit D6 must be programmed to 1 in order to latch the converted
data into the read-back registers. After the converted data is read back, page 0 / register 103, bit D6 must
be immediately reset to 0. In dc-measurement mode, two measurement modes are supported.
Mode A
In dc-measurement mode A, a variable-length averaging filter is used. The length of averaging filter D can
be programmed from 1 to 20 by programming page 0 / register 102, bits D4–D0. To choose mode A,
page 0 / register 102, bit D5 must be programmed to 0.
40
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
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Product Folder Link(s): TLV320AIC3111
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