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| 型号： | PADS1298CZXGT |
| 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： | 55/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
200k
W
200k
W
RLD
Amp
(AVDD+AVSS)/2
CH8N
CH1P
RLDREF_INT
RLD_REF
RLD_OUT
RLD_INV
RLD
ADS129x
WCT_TO_RLD
FromWCTAmplifiers
RLD_REF
FromPGA
WCT
RLDINV
RLD
OUT
RLD
REF
RLDIN
VA1-8
Device2
VA1-8
RLDINV
RLD
OUT
RLD
REF
RLDIN
VA1-8
DeviceN
VA1-8
Power-Down
RLDINV
RLD
OUT
RLD
REF
RLDIN
VA1-8
Device1
VA1-8
ToInputMUX
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
WCT as RLD
In certain applications, the right leg drive is derived as the average of RA, LA, and LL. This level is the same as
the WCT voltage. The WCT amplifier has limited drive strength and thus should be used only to drive very high
impedances directly. The ADS1294/6/8 provide an option to internally buffer the WCT signal by setting the
WCT_TO_RLD bit in the CONFIG4 register. The RLD_OUT and RLD_INV pins should be shorted external to the
device. Note that before the RLD_OUT signal is connected to the RLD electrode, an external amplifier should be
used to invert the phase of the signal for negative feedback.
Figure 43. Using the WCT as the Right Leg Drive
RLD Configuration with Multiple Devices
Figure 44 shows multiple devices connected to an RLD.
Figure 44. RLD Connection for Multiple Devices
Copyright 2010, Texas Instruments Incorporated
59
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