参数资料
型号: TLV320AIC11CPFB
厂商: TEXAS INSTRUMENTS INC
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP48
封装: GREEN, PLASTIC, TQFP-48
文件页数: 20/55页
文件大小: 263K
代理商: TLV320AIC11CPFB
2–13
2.8
Multiplexed Analog Input and Output
The two differential analog inputs (INP and INM, or AUXP and AUXM) are multiplexed into the sigma-delta modulator.
The performance of the AUX channel is similar to the normal-input channel. The gain of the input amplifiers is set
through control register 4.
2.8.1
Multiplexed Analog Input
To produce excellent common-mode rejection of unwanted-signal performance, the analog signal is processed
differentially until it is converted to digital data. The signal applied to the INM and INP terminals should be differential
to preserve the device specifications. The signal source driving the analog inputs (INP and INM, or AUXP and AUXM)
should have a low source impedance to attain the lowest noise performance and accuracy. To obtain maximum
dynamic range, the signal should be ac-coupled to the input terminal. The analog input signal is self-biased to the
midsupply. Bit D4 of control register 1 selects these input sources. The default condition self-biases the input, since
the register default value selects INP and INM as the sources for the ADC.
TLV320AIC11
INP
VINP
2.5 V
INM
VINM
(or ) 1.5 V
Figure 2–17. INP and INM Internal Self-Biased Circuit (2.5 V for 5-V Operation and 1.5 V for 3-V Operation)
2.8.2
Analog Output
OUTP and OUTM are differential outputs that can typically drive a 600-ohm load directly. Figure 2–18 shows the
circuit when the load is ground-referenced.
OUTM
+
10 k
10 k
10 k
Load
10 k
+5 V
–5 V
TLE2062
OUTP
Figure 2–18. Differential Output Drive (Ground-Referenced
)
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