参数资料
| 型号： | AD8231ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/24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 22 of 24
When operating the AD8231 on dual supplies, a level-shift is
typically needed from standard single-supply control logic. One
easy way to accomplish the level-shift is through a single-pole,
application schematic for ±2.5 V operation.
0658
6-
0
55
+2.5V
–2.5V
+2.5V
–2.5V
+2.5V
–2.5V
A0
A1
A2
EN
VDD
GND
VSS
–2.5V
GND
VDD
DIGITAL
CONTROL
(FPGA,
MICROCONTROLLER,
ETC.)
VDIGITAL
ADG633
AD8231
A0 A1 A2
+VS
–VS
SDN
CS
+2.5V
VDIGITAL IS THE DIGITAL SUPPLY VOLTAGE. IT CAN BE
ANY VOLTAGE BETWEEN 2.5V AND 9.5V.
–2.5V
Figure 55. Converting Single-Supply Control Signals to Dual Supply.
SALLEN KEY FILTER
The extra op amp in the AD8231 can be used to create a 2-pole
Sallen Key filter. Such a filter can remove excess noise or
perform antialiasing before an analog-to-digital converter.
Figure 56 shows how to create a 2-pole low-pass Butterworth
filter. Components R1, R2, C1, and C2 set the frequency of the
filter. The ratio of R3 and R4 sets the peaking of the filter. If R4
equals 10 kΩ, R3 should equal 5.9 kΩ for an optimum 2-pole
response.
Depending on the circuitry before and after the AD8231,
a 3-pole filter can be possible. If the previous stage has a small
output impedance, an additional pole can be added before the
in amp (R6, R7, and C4). If the following stage has a high input
impedance, an additional pole can be added after the op amp
(R5 and C3). Peaking from the Sallen Key stage should be
higher to compensate for the extra attenuation of the third pole;
both R3 and R4 should be 10 kΩ for optimum response.
Note that in addition to setting the peaking of the filter, the
ratio R3/R4 also sets the dc gain: G = 1 + R3/R4. If lower dc
gain is required, replace R1 with a voltage divider, where the
output resistance of the divider is equal to the required value of R1.
Figure 56 shows a bias point connected to R4 and the in-amp
reference. The filter stage amplifies the signal around this bias
point. The bias point is ypically midsupply and should be low
impedance.
Table 10. Recommended Component Values for Butterworth
Low-Pass Filter in Figure 56
Optional Poles
Sallen Key
Before In-Amp
After Op Amp
3 dB
Freq
R1, R2
(kΩ)
C1, C2
(nF)
R6, R7
(kΩ)
C4
(nF)
R5
(kΩ)
C3
(nF)
32 Hz
499
10
499
4.7
49.9
100
100 Hz
158
10
158
4.7
16
100
320 Hz
49.9
10
49.9
4.7
4.99
100
1 kHz
158
1
158
0.47
1.6
100
3.2 kHz
49.9
1
49.9
0.47
0.499
100
10 kHz
15.8
1
15.8
0.47
0.16
100
32 kHz
4.99
1
4.99
0.47
0.049
100
06
58
6-
0
56
IN-AMP
OP AMP
REF
BIAS
POINT
BIAS
POINT
R7
R1
R2
R6
R5
C4
SALLEN KEY
(TWO POLE)
OPTIONAL POLE
C3
R3
R4
C2
C1
Figure 56. Butterworth Low-Pass Filter (Dotted Sections Indicate Optional Poles)
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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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