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參數(shù)資料
| 型號： | AD8253ARMZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST ICMOS LDRIFT 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | iCMOS® |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 20 V/µs |
| -3db帶寬： | 10MHz |
| 電流 - 輸入偏壓： | 5nA |
| 電壓 - 輸入偏移： | 150µV |
| 電流 - 電源： | 4.6mA |
| 電流 - 輸出 / 通道： | 37mA |
| 電壓 - 電源，單路/雙路(±)： | ±5 V ~ 15 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
AD8253
Data Sheet
Rev. B | Page 20 of 24
R
AD8253
+15V
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–15V
CD
CC
0
698
3-
0
57
Figure 58. RFI Suppression
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 negative input degrades the CMRR of the AD8253.
By using a value of CD that is 10 times larger than the value of
CC, the effect of the mismatch is reduced and performance is
improved.
DRIVING AN ANALOG-TO-DIGITAL CONVERTER
An instrumentation amplifier is often used in front of an analog-
to-digital converter to provide CMRR. Usually, instrumentation
amplifiers require a buffer to drive an ADC. However, the low
output noise, low distortion, and low settle time of the AD8253
make it an excellent ADC driver.
In this example, a 1 nF capacitor and a 49.9 Ω resistor create an
antialiasing filter for the AD7612. The 1 nF capacitor also serves
to store and deliver necessary charge to the switched capacitor
input of the ADC. The 49.9 Ω series resistor reduces the burden
of the 1 nF load from the amplifier and isolates it from the kickback
current injected from the switched capacitor input of the AD7612.
Selecting too small a resistor improves the correlation between
the voltage at the output of the AD8253 and the voltage at the
input of the AD7612 but may destabilize the AD8253. A trade-
off must be made between selecting a resistor small enough to
maintain accuracy and large enough to maintain stability.
0.1μF
1nF
49.9
AD7612
ADR435
+12V
–12V
+5V
+15V
–15V
A0
A1
WR
+IN
–IN
10μF0.1F
REF
AD8253
DGND
06
98
3-
0
58
Figure 59. Driving an ADC
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