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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： | 51/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
51kW
100kW
47nF
51kW
100kW
47nF
4-Bit
DAC
Skin,
ElectrodeContact
Model
Patient
Protection
Resistor
AVDD
LOFF_SENSP
VLEAD_OFF_EN
AND
AVSS
LOFF_SENSN
VLEAD_OFF_EN
AND
LOFF_SENSP
VLEAD_OFF_EN
AND
LOFF_SENSN
VLEAD_OFF_EN
AND
RLDOUT
FLEAD_OFF[1:0]
Vx
3.3MW
Anti-AliasingFilter
<512kHz
FLEAD_OFF[0:1]
AVDD
AVSS
ToADC
LOFF_STATP
LOFF_STATN
COMP_TH[2:0]
V
INP
V
INN
(AVDD+AVSS)/2
7MW
10pF
PGA
EMI
Filter
12pF
Patient
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
AC Lead-Off
In this method, an out-of-band ac signal is used for excitation. The ac signal is generated by alternatively
providing pull-up resistors and pull-down resistors at the input with a fixed frequency. The ac signal is passed
through an anti-aliasing filter to avoid aliasing. The frequency can be chosen by the FLEAD_OFF[1:0] bits in the
LOFF register. The excitation frequency is a function of the output data rate and can be chosen to be either fDR/2
or fDR/4. This out-of-band excitation signal is passed through the channel and measured at the output.
Sensing of the ac signal is done by passing the signal through the channel to digitize it and measure at the
output. The ac excitation signals are introduced at a frequency that is above the band of interest, generating an
out-of-band differential signal that can be filtered out separately and processed. By measuring the magnitude of
the excitation signal at the output spectrum, the lead-off status can be calculated. Therefore, the ac lead-off
detection can be accomplished simultaneously with the ECG signal acquisition.
Figure 40. Lead-Off Detection
Copyright 2010, Texas Instruments Incorporated
55
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