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AD7686BRMZ 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
AD转换器
封装:
MSOP-10
描述:
ANALOG DEVICES AD7686BRMZ 模数转换器, SAR, 16 bit, 500 kSPS, 单, 1.8 V, 5.8 V, MSOP
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AD7686BRMZ数据手册
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Data Sheet AD7686
Transfer Functions
The ideal transfer characteristic for the AD7686 is shown in
Figure 25 and Table 7.
000...000
000...001
000...010
111...101
111...110
111...
11
1
ADC CODE (STRAIGHT BINARY)
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
02969-025
Figure 25. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
V
REF
= 5 V
Digital Output Code
Hexadecimal
FSR – 1 LSB 4.999924 V FFFF
1
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 0000
2
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 (V
IN+
− V
IN−
above V
REF
− V
GND
).
2
This is also the code for an underranged analog input (V
IN+
− V
IN−
below V
GND
).
AD7686
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE INTER
FACE
5
100nF
100nF
5V
10µF
2
≥
7V
≥7V
≤–2V
1.8V T
O VDD
REF
1
0 TO VREF
33Ω
2.7nF
3
4
02969-026
1
SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2
C
REF
IS USUALLY A 10
µ
F CERAMIC CAPACIT
OR (X5R).
3
SEE DRIVER AMPLIFIER CHOICE SECTION.
4
OPTIONA
L FIL
TER. SEE ANALOG INPUT SECTION.
5
SEE DIGIT
AL
INTERF
ACE SECTION FOR MOST CONVENIENT INTERF
ACE MODE.
Figure 26. Typical Application Diagram with Multiple Supplies
Rev. C | Page 13 of 28
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