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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： | 52/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
51k
W
100k
W
47nF
Skin,
ElectrodeContact
Model
Patient
Protection
Resistor
AVDD
RLD_SENS AND
VLEAD_OFF_EN
AVSS
RLD_STAT
Patient
RLD_SENS AND
VLEAD_OFF_EN
ToADCinput(throughV
connectiontoanyofthechannels).
REF
ILGND_OFF[1:0]
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
www.ti.com
RLD Lead-Off
The ADS1294/6/8 provide two modes for determining whether the RLD is correctly connected:
RLD lead-off detection during normal operation
RLD lead-off detection during power-up
The following sections provide details of the two modes of operation.
RLD Lead-Off Detection During Normal Operation
During normal operation, the ADS1294/6/8 RLD lead-off at power-up function cannot be used because it is
necessary to power off the RLD amplifier.
RLD Lead Off Detection At Power-Up
This feature is included in the ADS1294/6/8 for use in determining whether the right leg electrode is suitably
connected. At power-up, the ADS1294/6/8 provide two measurement procedures to determine the RLD electrode
connection status using either a current or a voltage pull-down resistor, as shown in Figure 41. The reference
level of the comparator is set to determine the acceptable RLD impedance threshold.
Figure 41. RLD Lead-Off Detection at Power-Up
When the RLD amplifier is powered on, the current source has no function. Only the comparator can be used to
sense the voltage at the output of the RLD amplifier. The comparator thresholds are set by the same LOFF[7:5]
bits used to set the thresholds for other negative inputs.
56
Copyright 2010, Texas Instruments Incorporated
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