参数资料
型号: AD7625BCPZ
厂商: Analog Devices Inc
文件页数: 8/24页
文件大小: 0K
描述: IC ADC 16BIT 6MSPS SAR 32LFCSP
设计资源: High Speed, Precision, Differential AC-Coupled Drive Circuit for AD7625 (CN0080)
特色产品: AD7625: 16-Bit, 6MSPS PulSAR Differential ADC
标准包装: 1
系列: PulSAR®
位数: 16
采样率(每秒): 6M
数据接口: 串行
转换器数目: 1
功率耗散(最大): 190mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 托盘
输入数目和类型: 1 个差分,双极
AD7625
Data Sheet
Rev. A | Page 16 of 24
DRIVING THE AD7625
Differential Analog Input Source
Figure 24 shows an ADA4899-1 driving each differential input
to the AD7625.
Single-Ended-to-Differential Driver
For applications using unipolar analog signals, a single-ended-
to-differential driver, as shown in Figure 23, allows for a differ-
ential input into the part. This configuration, when provided
with an input signal of 0 V to 4.096 V, produces a differential
±4.096 V with midscale at 2.048 V. The one-pole filter using
R = 33 Ω and C = 56 pF provides a corner frequency of 86 MHz.
The VCM output of the AD7625 can be buffered and then used
to provide the required 2.048 V common-mode voltage.
56pF
33
50
IN+
IN–
AD7625
VCM
V–
V+
AD8031, AD8032
07652-
033
U2
U1
ADA4899-1
56pF
100nF
590
ANALOG INPUT
(UNIPOLAR 0V TO 4.096V)
Figure 23. Single-Ended-to-Differential Driver Circuit
56pF
33
–VS
0V TO VREF
+VS
56pF
33
–VS
VREF TO 0V
+VS
CREF
10F2
REF1
REF
GND
IN+
IN–
AD7625
ADA4899-1
1SEE THE VOLTAGE REFERENCE OPTIONS SECTION. CONNECTION TO EXTERNAL REFERENCE SIGNALS
IS DEPENDENT ON THE EN1 AND EN0 SETTINGS.
2CREF IS USUALLY A 10F CERAMIC CAPACITOR WITH LOW ESL AND ESR.
THE REF AND REFIN PINS ARE DECOUPLED REGARDLESS OF EN1 AND EN0 SETTINGS.
VCM
–VS
+VS
BUFFERED VCM PIN OUTPUT
GIVES THE REQUIRED 2.048V
COMMON-MODE SUPPLY FOR
ANALOG INPUTS.
VCM
2.048V
AD8031, AD8032
ADA4899-1
REFIN
REF1
CREF
10F2
07652-
025
0.1F
Figure 24. Driving the AD7625 from a Differential Analog Source
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