参数资料
型号: AD8295BCPZ-WP
厂商: Analog Devices Inc
文件页数: 18/28页
文件大小: 0K
描述: IC IN AMP PREC FE +/-18V 16LFCSP
标准包装: 64
放大器类型: 仪表
电路数: 3
转换速率: 2 V/µs
增益带宽积: 1MHz
-3db带宽: 1.2MHz
电流 - 输入偏压: 200pA
电压 - 输入偏移: 60µV
电流 - 电源: 2mA
电流 - 输出 / 通道: 18mA
电压 - 电源,单路/双路(±): 4.6 V ~ 36 V,±2.3 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-VQFN,CSP
供应商设备封装: 16-LFCSP(4x4)
包装: 托盘 - 晶粒
AD8295
Rev. A | Page 25 of 2
8
If the application requires a lower frequency antialiasing filter
than the one shown, increasing the capacitor values produces
much better distortion results than increasing the resistor values.
DRIVING DIFFERENTIAL ADCs
Figure 71 shows how to configure the AD8295 to drive a differ-
ential ADC. The circuit shown uses very little board space and
consumes little power. With the AD7690, this configuration
gives excellent dc performance and a THD of 83 dB (10 kHz
input). For applications that need better distortion performance,
a dedicated ADC driver, such as the ADA4941-1 or ADA4922-1
is recommended.
The 500 Ω resistors also protect the ADC against overvoltage.
Because the AD8295 runs on wider supply voltages than a typ-
ical ADC, there is a possibility of overdriving some converters.
This is not an issue with a PulSAR ADC, such as the AD7690,
because its input can handle a 130 mA overdrive, which is much
higher than the short-circuit limit of the AD8295. However,
other converters have less robust inputs and may benefit from
the resistive protection.
The 500 Ω resistors and the 2.2 nF capacitors form a low-pass,
antialiasing filter at 144 kHz. The four elements of the filter also
prevent the switching transients produced by a typical SAR ADC
from destabilizing the AD8295. The capacitors provide charge to
the switched-capacitor front end of the ADC, and the resistors
shield the AD8295 from driving any sharp current changes.
+7V
A1
OUT
A1
R2
A2
+IN
A2
–IN
–INPUT
+INPUT
0.1F
–VS
–7V
REF
+IN
IN– GND
REF
RG
+VS
+7V
OUT
RG
VDD
IN+
1
2
3
4
8
7
6
5
13
14
15
16
A1
IA
A2
R1
20k
R2
20k
A2
OUT
AD8295
ADR435
A1
+IN
+2.5V
+OUT
500
10k
2.2nF
A1
R1
+5V
+
AD7690
10F
500
2.2nF
–OUT
A1
–IN
12
11
10
9
0.1F
+5V
0.1F
+5V
0.1F
07
34
3-
0
14
Figure 71. Driving a Differential ADC
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