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參數(shù)資料
| 型號： | AD8235ACBZ-P7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR RRIO 23KHZ 11WLCSP |
| 產(chǎn)品變化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 特色產(chǎn)品： | AD8235 Instrumentation Amplifier |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.011 V/µs |
| -3db帶寬： | 23kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 2500µV |
| 電流 - 電源： | 30µA |
| 電流 - 輸出 / 通道： | 55mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 11-WFBGA，WLCSP |
| 供應(yīng)商設(shè)備封裝： | 11-WLCSP（1.57x2.04） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
| 其它名稱： | AD8235ACBZ-P7DKR |
AD8235
Rev. 0 | Page 19 of 20
APPLICATIONS INFORMATION
AC-COUPLED INSTRUMENTATION AMPLIFIER
An integrator can be tied to the AD8235 in feedback to create a
high-pass filter, as shown in Figure 43. This circuit can be used
to reject dc voltages and offsets. At low frequencies, the impedance
of the capacitor, C, is high. Therefore, the gain of the integrator
is high. DC voltage at the output of the AD8235 is inverted and
gained by the integrator. The inverted signal is injected back into
the REF pin, nulling the output. In contrast, at high frequencies,
the integrator has low gain because the impedance of C is low.
Voltage changes at high frequencies are inverted but at a low
gain. The signal is injected into the REF pins, but it is not enough to
null the output. At very high frequencies, the capacitor appears as
a short. The op amp is at unity gain. High frequency signals are,
therefore, allowed to pass.
When a signal exceeds fHIGH-PASS, the AD8235 outputs the high-
pass filtered input signal.
AD8235
AD8603
R
+VS
+IN
–IN
0.1F
10F
REF
C
+VS
VREF
1
2πRC
fHIGH-PASS =
08
21
1-
0
41
SDN
Figure 43. AC-Coupled Circuit
LOW POWER HEART RATE MONITOR
The low power and small size of the AD8235 make it an excellent
choice for heart rate monitors. As shown in Figure 44, the
AD8235 measures the biopotential signals from the body. It
rejects common-mode signals and serves as the primary gain
stage set at G = 5. The 4.7 μF capacitor and the 100 kΩ resistor
set the 3 dB cutoff of the high-pass filter that follows the
instrumentation amplifier. It rejects any differential dc offsets
that may develop from the half-cell overpotential of the electrode.
A secondary gain stage, set at G = 403, amplifies the ECG signal,
which is then sent into a second-order, low-pass, Bessel filter
with 3 dB cutoff at 48 Hz. The 324 Ω resistor and 1 μF capacitor
serve as an antialiasing filter. The 1 μF capacitor also serves as a
charge reservoir for the ADC switched capacitor input stage.
This circuit was designed and tested using the AD8609, low
power, quad op amp. The fourth op amp is configured as a Schmitt
trigger to indicate if the right arm or left arm electrodes fall off
the body. Used in conjunction with the 953 kΩ resistors at the
inputs of the AD8235, the resistors pull the inputs apart when
the electrodes fall off the body. The Schmitt trigger sends an
active low signal to indicate a leads off condition.
The reference electrode (right leg) is set tied to ground. Likewise,
the shield of the electrode cable is also tied to ground. Some
portable heart rate monitors do not have a third electrode. In
such cases, the negative input of the AD8235 can be tied to GND.
Note that this circuit is shown, solely, to demonstrate the capability
of the AD8235. Additional effort must be made to ensure
compliance with medical safety guidelines.
+2.5V
–2.5V
+2.5V
–2.5V
+2.5V
–2.5V
0.1F
+2.5V
AD8609
AD8235
IN-AMP
AD8609
LEADS OFF DETECTION
INTERRUPT
LEADS OFF
402k
1k
24.9k
324
1F
220nF
4.7F
100k
953k
RA
LA
RL
953k
1k
20k
5k
680nF
4.02k
MCU + ADC
10-BIT ADC
0.1F
SDN
08
21
1-
0
42
Figure 44. Example Low Power Heart Rate Monitor Schematic
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