参数资料
| 型号： | AD8231ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST R-R 7MHZ 16LFCSP |
| 产品培训模块： | Pulse Oximetry Solutions Top Five Instrumentation Amplifier Problems Instrumentation Amplifiers Performance |
| 标准包装： | 1 |
| 放大器类型： | 仪表 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1.1 V/µs |
| 增益带宽积： | 7MHz |
| 电流 - 输入偏压： | 250pA |
| 电压 - 输入偏移： | 4µV |
| 电流 - 电源： | 4mA |
| 电流 - 输出 / 通道： | 70mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 6 V，±1.5 V ~ 3 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ EP（4x4） |
| 包装： | 标准包装 |
| 产品目录页面： | 771 (CN2011-ZH PDF) |
| 配用： | AD8231-EVALZ-ND - BOARD EVAL FOR AD8231 |
| 其它名称： | AD8231ACPZ-R7DKR |
AD8231
Rev. B | Page 20 of 24
If more common-mode range is required, the simplest solution is
to apply less gain in the instrumentation amplifier. The extra op
amp can be used to provide another gain stage after the in-amp.
Because the AD8231 has good offset and noise performance at low
gains, applying less gain in the instrumentation amplifier generally
has a limited impact on the overall system performance.
RF INTERFERENCE
RF rectification is often a problem when amplifiers are used in
applications where there are strong RF signals. The disturbance
can appear as a small dc offset voltage. High frequency signals
can be filtered with a low-pass, RC network placed at the
input of the instrumentation amplifier, as shown in Figure 52.
The filter limits the input signal bandwidth according to the
following relationship
REDUCING NOISE
Because the AD8231 has no 1/f noise, reducing the bandwidth
corresponds directly to less noise. Table 8 shows the AD8231
performance at a gain of 1 at different bandwidths, assuming a
2-pole Butterworth filter roll off.
Table 8. AD8231 noise at various bandwidths
)
(2
2
1
C
D
Diff
C
R
FilterFreq
+
π
=
C
CM
RC
FilterFreq
π
=
2
1
SNR
Single-Ended1
SNR Differential
Output2
where CD ≥ 10CC.
Bandwidth
(Hz)
Noise
(μV rms)
R
AD8231
+VS
+INA
–INA
0.1F
10F
0.1F
REF
VOUT
–VS
CD
10nF
CC
1nF
CC
1nF
4.02k
06
58
6-
0
34
dB
Bits
dB
Bits
1
0.07
148.3
24.3
154.3
25.3
3.2
0.12
143.2
23.5
149.2
24.5
10
0.21
138.3
22.7
144.3
23.7
32
0.37
133.2
21.8
139.2
22.8
100
0.66
128.3
21.0
137.63
22.0
320
1.17
123.2
20.2
129.2
21.2
1 k
2.07
118.3
19.3
124.3
20.3
3.2 k
3.71
113.2
18.5
119.2
19.5
10 k
6.55
108.3
17.7
117.3
18.7
32 k
11.73
103.2
16.9
109.2
17.9
1 SNR for single-ended output configuration calculated with output signal of
4.8 V p-p, which corresponds to 1.697 V rms.
Figure 52. RFI Suppression
2 SNR for differential output configuration calculated with output signal of
9.6 V p-p, which corresponds to 3.397 V rms.
Figure 52 shows an example where the differential filter frequency
is approximately 2 kHz, and the common-mode filter frequency
is approximately 40 kHz.
The AD8231 has two clocks: an auto-zero clock at 3.4 kHz and
a commutating clock at 54 kHz. While the auto-zero clock has
negligible energy and can generally be ignored, the commutating
clock has enough energy to significantly affect the noise of the
part. Therefore, in applications where low noise is critical, limiting
the bandwidth of the system below 54 kHz is recommended.
Values of R and CC should be chosen to minimize RFI. Mismatch
between the R × CC at the positive input and the R × CC at the
negative input degrades the CMRR of the AD8231. By using a
value of CD that is ten times larger than the value of CC, the
effect of the mismatch is reduced and performance is improved.
COMMON-MODE INPUT VOLTAGE RANGE
The 3-op amp architecture of the AD8231 applies gain and then
removes the common-mode voltage. Therefore, internal nodes
in the AD8231 experience a combination of both the gained
signal and the common-mode signal. This combined signal can
be limited by the voltage supplies even when the individual input
and output signals are not. To determine whether the signal could
following formula
V
04
.
0
2
V
04
.
0
+
<
×
±
<
+
S
DIFF
CM
S
V
Gain
V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8231ACPZ-R7 | 制造商:Analog Devices 功能描述:INSTR-AMPLIFIER, 7MHZ, 120DB, LFCSP-16 |
| AD8231ACPZ-RL | 功能描述:IC AMP INST R-R 7MHZ 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8231ACPZ-WP | 功能描述:IC AMP INST R-R 7MHZ 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| AD8231-EVALZ | 功能描述:BOARD EVAL FOR AD8231 RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| AD8231TCPZ-EP-R7 | 功能描述:IC INSTR AMP PROGR ENH 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:150 系列:- 放大器类型:音频 电路数:2 输出类型:- 转换速率:5 V/µs 增益带宽积:12MHz -3db带宽:- 电流 - 输入偏压:100nA 电压 - 输入偏移:500µV 电流 - 电源:6mA 电流 - 输出 / 通道:50mA 电压 - 电源，单路/双路(±):4 V ~ 32 V，±2 V ~ 16 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
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