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| 型號： | AD8275BRMZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF R-R LDRIFT 8MSOP |
| 產(chǎn)品培訓模塊： | Power Line Monitoring |
| 標準包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 25 V/µs |
| -3db帶寬： | 15MHz |
| 電壓 - 輸入偏移： | 150µV |
| 電流 - 電源： | 1.9mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 3.3 V ~ 15 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 766 (CN2011-ZH PDF) |
| 其它名稱： | AD8275BRMZ-R7DKR |
AD8275
Rev. A | Page 14 of 16
APPLICATIONS INFORMATION
DRIVING A SINGLE-ENDED ADC
The AD8275 provides the common-mode rejection that SAR
ADCs often lack. In addition, it enables designers to use cost-
effective, precision, 16-bit ADCs such as the AD7685, yet still
condition ±10 V signals.
One important factor in selecting an ADC driver is its ability to
settle within the acquisition window of the ADC. The AD8275
is able to drive medium speed SAR ADCs.
In Figure 38, the 2.7 nF capacitor serves to store and deliver
necessary charge to the switched capacitor input of the ADC.
The 33 Ω series resistor reduces the burden of the 2.7 nF load
from the amplifier and isolates it from the kickback current
injected from the switched capacitor input of the AD7685. The
output impedance of the amplifier can affect the THD of the
ADC. In this case, the combined impedance of the 33 Ω resistor
and the output impedance of the AD8275 provides extremely
low THD of 112 dB. Figure 39 shows the ac response of the
AD8275 driving the AD7685.
07546-
034
VREF
(ADR444,
ADR445)
AD8275
7
4
5
6
8
2
50k
0.1F
50k
20k
20k
33
10k
3
+IN
–IN
VIN
REF2
REF1
–VS
+VS
+5V
OUT
SENSE
0.1F
2.7nF
10F
1
AD7685
VDD
GND
REF
IN+
IN–
Figure 38. Driving a Single-Ended ADC
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
–170
0
1
4
7
10
07546-
139
ADC
F
UL
L
S
CAL
E
(
d
B)
FREQUENCY (kHz)
2
5
8
3
6
9
Figure 39. FFT of AD8275 Directly Driving the AD7685 Using the 5 V
Reference of the Evaluation Board (Input = 20 V p-p, 1 kHz, THD = 112 dB)
The AD8275 can condition signals for higher resolution ADCs
such as 18-bit SAR converters, provided that a narrower
bandwidth is sampled to limit noise.
DIFFERENTIAL OUTPUTS
In certain applications, it is necessary to create a differential signal.
For example, high resolution ADCs often require a differential
input. In other cases, transmission over a long distance can require
differential signals for better immunity to interference.
Figure 40 shows how to configure the AD8275 to output a
differential signal. The AD8655 op amp is used in an inverting
topology to create a differential voltage. VREF sets the output
midpoint. Errors from the op amp are common to both outputs
and are thus common mode. Likewise, errors from using
mismatched resistors cause a common-mode dc offset error.
Such errors are rejected in differential signal processing by
differential input ADCs or by instrumentation amplifiers.
When using this circuit to drive a differential ADC, VREF can be
set using a resistor divider from the ADC reference to make the
output ratiometric with the ADC.
07546-
035
AD8275
7
4
5
6
8
2
50k
0.1F
8.2F
50k
20k
20k
2k
2k
10k
3
+IN
–IN
REF2
REF1
–VS
+VS
+5V
+10V
–10V
+5V
OUT
SENSE
1
AD8655
VREF = 2.5V
+VOUT
–VOUT
+3.5V
+1.5V
+2.5V
+3.5V
+1.5V
+2.5V
Figure 40. AD8275 Configured for Differential Output (for Driving a Differential ADC)
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