參數(shù)資料
型號(hào): TLC320AD50IPT
廠商: Texas Instruments, Inc.
英文描述: SIGMA-DELTA ANALOG INTERFACE CIRCUITS WITH MASTER-SLAVE FUNCTION
中文描述: sigma - delta模擬接口,具有大師電路,從功能
文件頁(yè)數(shù): 19/84頁(yè)
文件大小: 447K
代理商: TLC320AD50IPT
2–4
2.3
Table 2–1 describes the function of the master/slave (M/S) input. The only difference between master and
slave operations in the TLC320AC02 is that SCLK and FS are outputs when M/S is high and inputs when
M/S is low.
Master-Slave Terminal Function
Table 2–1. Master-Slave Selection
MODE
M/S
FS
SCLK
Master and Stand Alone
H
Output
Output
Slave and Codec Emulation
When the stand-alone mode is desired or when the device is
permanently in the master mode, M/S must be high.
L
Input
Input
2.4
To produce excellent common-mode rejection of unwanted signals, the analog signal is processed
differentially until it is converted to digital data. The signal is amplified by the input amplifier at one of three
software-selectable gains (typically 0 dB, 6 dB, or 12 dB). A squelch mode can also be programmed for the
input amplifier.
ADC Signal Channel
The amplifier output is filtered and applied to the ADC input. The ADC converts the signal into discrete digital
words in 2s-complement format corresponding to the analog-signal value at the sampling time. These 16-bit
digital words, representing sampled values of the analog input signal, are clocked out of the serial port
(DOUT), one word for each primary communication interval. During secondary communications, the data
previously programmed into the registers can be read out with the appropriate register address and with the
read bit set to 1. When a register read is not requested, all 16 bits are 0.
2.5
DIN receives the 16-bit serial data word (2s complement) from the host during the primary communications
interval and latches the data on the seventeenth rising edge of SCLK. The data are converted to an analog
voltage by the DAC with a sample and hold and then through a (sin x)/x correction circuit and a smoothing
filter. An output buffer with three software-programmable gains (0 dB, –6 dB, and –12 dB), as shown in
register 4, drives the differential outputs OUT+ and OUT–. A squelch mode can also be programmed for
the output buffer. During secondary communications, the configuration program data are read into the
device control registers.
DAC Signal Channel
2.6
The digital serial interface consists of the shift clock, the frame-synchronization signal, the ADC-channel
data output, and the DAC-channel data input. During the primary 16-bit frame-synchronization interval, the
SCLK transfers the ADC channel results from DOUT and transfers 16-bit DAC data into DIN.
Serial Interface
During the secondary frame-synchronization interval, the SCLK transfers the register read data from DOUT
when the read bit is set to a 1. In addition, the SCLK transfers control and device parameter information into
DIN. The functional sequence is shown in Figure 2–1.
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TLC320AD50(中文) Sigma-Delta Analog Interface Circuit With Master-Slave Function(Sigma-Delta 模擬接口具主從功能)
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