參數(shù)資料
型號(hào)： ADA4941-1YRZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 16/25頁(yè)
文件大小： 0K
描述： IC DIFF ADC DVR 18BIT 8-SOIC
設(shè)計(jì)資源： Converting a Single-Ended Signal with AD7982 Differential PulSAR ADC (CN0032)
Converting a Single-Ended Signal with AD7984 Differential PulSAR ADC (CN0033)
標(biāo)準(zhǔn)包裝： 98
類型： ADC 驅(qū)動(dòng)器
應(yīng)用： 數(shù)據(jù)采集
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 管件
產(chǎn)品目錄頁(yè)面： 768 (CN2011-ZH PDF)
ADA4941-1
Rev. C | Page 22 of 24
DRIVING THE AD7687 ADC
The ADA4941-1 is an excellent driver for high resolution
ADCs, such as the AD7687, as shown in Figure 56. The Sallen-
Key, low-pass filter shown in Figure 54 is included in this
example but is not required. The circuit shown in Figure 56
accepts single-ended input signals that swing between 0 V and 3 V.
The ADR443 provides a stable, low noise, 3 V reference that is
buffered by one of the AD8032 amplifiers and applied to the
AD7687 REF input, providing a differential input full-scale level
of 6 V. The reference voltage is also divided by two and buffered
to supply the midsupply REF level of 1.5 V for the ADA4941-1.
GAIN OF 2 CONFIGURATION
The ADA4941-1 can be operated in a configuration referred
to as gain of 2. Clearly, a gain of 2 can be achieved by
simply swapping the outputs of a gain of +2 circuit, but the
configuration described here is different. The configuration is
referred to as having negative gain to emphasize that the input
amplifier, A1, is operated as an inverting amplifier instead of in
its usual noninverting mode. As implied in its name, the voltage
gain from VIN to VO, dm is 2 V/V. See Figure 57 for the gain
of 2 configuration on ±5 V supplies.
The gain of 2 configuration is most useful in applications that
have wide input swings because the input common-mode
voltages are held at constant levels. The signal size is therefore
constrained by the output swing limits. The gain of 2 has a low
input resistance that is equal to RG.
1k
1k
GND
500
A2
A1
ADA4941-1
REF
IN
IN+
IN–
2
8
4
2.7nF
5
FB
+5V
–5V
560pF
VS+
VS–
OUT+
1
3
OUT–
VIN
VIN
0V TO 3V
VOUT
562
562
562
1.69k
33
33
6
05704-
060
0.1F
10F
2.7nF
3.9nF
10nF
1/2
AD8032
ADR443
4
8
1
4
0.1F
3
4
2
6
2
1/2
AD8032
AD7687
7
5
6
+5V
1k
1k
10F
0.1F
VDD
GND
5
REF
1
2
Figure 56. ADA4941-1 Driving the AD7687 ADC
1k
1k
RF
1k
RG
1k
500
500
A2
A1
REF
IN
2
8
4
5
FB
+5V
–5V
VS+
VS–
OUT+
1
3
6
OUT–
VIN
05704-
061
+
–
VO, dm
Figure 57. Gain of 2 Configuration
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ADA4941-1YRZ-RL 功能描述:IC DIFF ADC DRIVER 18BIT 8SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤
ADA4950-1 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
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ADA4950-1YCPZ-R2 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single ±5.5V/11V 16-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:FIXED GAIN 1,2&3 DIFF ADC DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single }5.5V/11V 16-Pin LFCSP EP
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