参数资料
型号: ADS1298RIZXGT
厂商: TEXAS INSTRUMENTS INC
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PBGA64
封装: 8 X 8 MM, LEAD FREE, PLASTIC, NFBGA-64
文件页数: 18/87页
文件大小: 1430K
代理商: ADS1298RIZXGT
PgaP
R
50kW
2
R
20k
(forGain=6)
W
1
R
50kW
2
FromMuxP
PgaN
FromMuxN
ToADC
SBAS459H
– JANUARY 2010 – REVISED MAY 2011
PGA SETTINGS AND INPUT RANGE
The PGA is a differential input/differential output amplifier, as shown in Figure 28. It has seven gain settings (1,
2, 3, 4, 6, 8, and 12) that can be set by writing to the CHnSET register (see the CHnSET: Individual Channel
Settings subsection of the Register Map section for details). The ADS129x have CMOS inputs and hence have
negligible current noise. Table 6 shows the typical values of bandwidths for various gain settings. Note that
Table 6 shows the small-signal bandwidth. For large signals, the performance is limited by the slew rate of the
PGA.
Figure 28. PGA Implementation
Table 6. PGA Gain versus Small-Signal Bandwidth
NOMINAL BANDWIDTH AT ROOM
GAIN
TEMPERATURE (kHz)
1
237
2
146
3
127
4
96
6
64
8
48
12
32
The resistor string of the PGA that implements the gain has 120k
of resistance for a gain of 6. This resistance
provides a current path across the outputs of the PGA in the presence of a differential input signal. This current
is in addition to the quiescent current specified for the device in the presence of a differential signal at the input.
Copyright
2010–2011, Texas Instruments Incorporated
25
相关PDF资料
PDF描述
ADSP-1401TN/883B 16-BIT, MICROPROGRAM SEQUENCER, PDIP48
ADSP-21160NCB-100 64-BIT, 50 MHz, OTHER DSP, PBGA400
ADSP-21365YSWZ-2BA 16-BIT, 55.55 MHz, OTHER DSP, PQFP144
ADSP-2181BS-160 24-BIT, 20 MHz, OTHER DSP, PQFP128
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