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| 型号： | AD8228BRZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LDRIFT LN 8SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 2.5 V/µs |
| -3db带宽： | 650kHz |
| 电流 - 输入偏压： | 400pA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 850µA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
AD8228
Rev. 0 | Page 19 of 24
APPLICATIONS INFORMATION
DIFFERENTIAL DRIVE
Figure 48 shows how to configure the AD8228 for differential
output. The advantage of this circuit is that the dc differential
accuracy depends on the AD8228 and not on the op amp or the
resistors. This circuit takes advantage of the precise control the
AD8228 has of its output voltage relative to the reference voltage.
The ideal equation for the differential output is as follows:
VDIFF_OUT = VOUT+ VOUT = Gain × (VIN+ VIN)
Op amp dc performance and resistor matching determine the
dc common-mode output accuracy. However, because common-
mode errors are likely to be rejected by the next device in the
signal chain, these errors typically have little effect on overall
system accuracy. The ideal equation for the common-mode
output is as follows:
VCM_OUT =
2
+ +
OUT
V
= VREF
For best ac performance, an op amp with at least 3 MHz gain
bandwidth product and 2 V/μs slew rate is recommended.
+IN
–IN
REF
AD8228
VREF
10k
+
–
AD8641
+OUT
–OUT
07
03
5-
0
17
10k
Figure 48. Differential Output Using an Op Amp
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8228
make it an excellent candidate for bridge measurements. As shown
in Figure 49, the bridge can be connected directly to the inputs
of the amplifier.
5V
2.5V
07
03
5-
0
1
10F
0.1F
AD8228
+IN
–IN
350
+
–
Figure 49. Precision Strain Gage
DRIVING A DIFFERENTIAL ADC
Figure 50 shows how the AD8228 can be used to drive a
differential ADC. The AD8228 is configured with an op amp and
two resistors for differential drive. The 510 Ω resistors and 2200
pF capacitors isolate the instrumentation amplifier from the
switching transients produced by the switched capacitor front
end of a typical SAR converter. These components between the
ADC and the amplifier also create a filter at 142 kHz, which
provides antialiasing and noise filtering. The advantage of this
configuration is that it uses less power than a dedicated ADC
driver: the AD8641 typically consumes 200 μA, and the current
through the two 10 kΩ resistors is 250 μA at full output voltage.
With the AD7688, this configuration gives excellent dc perform-
ance and a THD of 71 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.
07
03
5-
03
2
IN+
VDD
REF
GND
AD7688
IN–
0.1F
+5V
ADR435
GND
VIN
VOUT
0.1F
+8V
0.1F
10F
X5R
10k
0.1F
510
0.1F
510
0.1F
AD8228
+IN
–IN
REF
+8V
–8V
0.1F
–8V
+8V
AD8641
10k
Figure 50. Driving a Differential ADC
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