参数资料
型号: EVAL-AD7686CBZ
厂商: Analog Devices Inc
文件页数: 5/28页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7686
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 16
采样率(每秒): 500k
数据接口: 串行
输入范围: ±VREF
在以下条件下的电源(标准): 15mW @ 500kSPS,5 V
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7686
已供物品:
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AD7686
Rev. B | Page 13 of 28
Transfer Functions
The ideal transfer characteristic for the AD7686 is shown in
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CO
DE
(
S
T
RA
IG
H
T
BI
N
A
R
Y)
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
02
96
9-
0
25
Figure 25. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 5 V
Digital Output Code
Hexadecimal
FSR – 1 LSB
4.999924 V
FFFF1
Midscale + 1 LSB
2.500076 V
8001
Midscale
2.5 V
8000
Midscale – 1 LSB
2.499924 V
7FFF
–FSR + 1 LSB
76.3 μV
0001
–FSR
0 V
00002
TYPICAL CONNECTION DIAGRAM
Figure 26 shows an example of the recommended connection
diagram for the AD7686 when multiple supplies are available.
1 This is also the code for an overranged analog input (VIN+ VIN above VREF V
).
GND
2 This is also the code for an underranged analog input (V
V
below V
).
IN+
IN
GND
AD7686
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE INTERFACE5
100nF
5V
10F2
≥7V
≤–2V
1.8V TO VDD
REF1
0 TO VREF
33
2.7nF
3
4
02
96
9-
0
26
1SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
3SEE DRIVER AMPLIFIER CHOICE SECTION.
4OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
5SEE DIGITAL INTERFACE SECTION FOR MOST CONVENIENT INTERFACE MODE.
Figure 26. Typical Application Diagram with Multiple Supplies
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