參數(shù)資料
型號(hào): EVAL-CN0194-SDPZ
廠商: Analog Devices Inc
文件頁數(shù): 6/28頁
文件大小: 0K
描述: BOARD CFTL AD7685
設(shè)計(jì)資源: CN-0194 CFTL Eval/Design Support
標(biāo)準(zhǔn)包裝: 1
系列: Circuits from the Lab™
主要目的: 參考設(shè)計(jì),隔離式數(shù)據(jù)采集系統(tǒng)
嵌入式:
已用 IC / 零件: AD7685,AD8615,ADuM1402
已供物品:
AD7685
Rev. C | Page 14 of 28
Transfer Functions
The ideal transfer characteristic for the AD7685 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
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
02
96
8-
0
24
Figure 26. ADC Ideal Transfer Function
TYPICAL CONNECTION DIAGRAM
Figure 27 shows an example of the recommended connection
diagram for the AD7685 when multiple supplies are available.
AD7685
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
8-
02
5
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2. CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
3. SEE DRIVER AMPLIFIER CHOICE SECTION.
4. OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
5. SEE DIGITAL INTERFACE FOR MOST CONVENIENT INTERFACE MODE.
Figure 27. Typical Application Diagram with Multiple Supplies
Table 8. Output Codes and Ideal Input Voltages
Description
Analog Input VREF = 5 V
Digital Output Code Hexa
FSR – 1 LSB
4.999924 V
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
1 This is also the code for an overranged analog input (VIN+ VIN above VREF VGND).
2 This is also the code for an underranged analog input (VIN+ VIN below VGND).
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