參數(shù)資料
型號(hào): AD8270ACPZ-R7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 10/20頁(yè)
文件大?。?/td> 0K
描述: IC AMP DIFF 20MHZ DUAL 16LFCSP
標(biāo)準(zhǔn)包裝: 1,500
放大器類型: 差分
電路數(shù): 2
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 30 V/µs
增益帶寬積: 20MHz
電流 - 輸入偏壓: 500pA
電壓 - 輸入偏移: 450µV
電流 - 電源: 2.3mA
電流 - 輸出 / 通道: 100mA
電壓 - 電源,單路/雙路(±): 5 V ~ 36 V,±2.5 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN 裸露焊盤(pán),CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP-VQ
包裝: 帶卷 (TR)
AD8270
Rev. 0 | Page 18 of 20
DRIVING AN ADC
The AD270 high slew rate and drive capability, combined with
its dc accuracy, make it a good ADC driver. The AD8270 can
drive both single-ended and differential input ADCs. Many
converters require the output to be buffered with a small value
resistor combined with a high quality ceramic capacitor. See the
converter data sheet for more details. Figure 51 shows the AD8270
in differential configuration, driving the AD7688 ADC. The
AD8270 divides down the 5 V reference voltage from the ADR435,
so that the common-mode output voltage is 2.5 V, which is
precisely where the AD7688 needs it.
DRIVING CABLING
All cables have a certain capacitance per unit length, which varies
widely with cable type. The capacitive load from the cable may
cause peaking or instability in output response, especially when the
AD8270 is operating in a gain of 0.5.
To reduce the peaking, use a resistor between the AD8270 and the
cable. Because cable capacitance and desired output response vary
widely, this resistor is best determined empirically. A good starting
point is 20 Ω.
06
97
9-
0
6
0
AD8270
(DIFF OUT)
AD8270
(SINGLE OUT)
Figure 50. Driving Cabling
10k
20k
10k
0.1F
5V_REF
AD8270
2
3
4
5
6
7
8
9
10
11
1
15
12
–IN
+IN
–IN
+IN
16
13
+12V –12V
33
2.7nF
COG
33
2.7nF
COG
14
3
4 –IN
+IN
1
REF
AD7688
0.1F
ADR435
2
4
5
GND
VIN
VOUT
+12V
10F
5V_REF
NOTE:
POWER SUPPLY DECOUPLING
NOT SHOWN.
06
97
9-
0
37
Figure 51. Driving an ADC
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