參數(shù)資料
型號: AD7980BRMZ
廠商: Analog Devices Inc
文件頁數(shù): 6/28頁
文件大?。?/td> 0K
描述: ADC 16BIT 1MSPS 1.25LSB 10-MSOP
標準包裝: 1
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 1M
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數(shù)目: 1
功率耗散(最大): 9mW
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 10-MSOP
包裝: 管件
輸入數(shù)目和類型: 1 個偽差分,單極
產(chǎn)品目錄頁面: 780 (CN2011-ZH PDF)
AD7980
Data Sheet
Rev. C | Page 14 of 28
Transfer Functions
The ideal transfer characteristic for the AD7980 is shown in
000 ... 000
000 ... 001
000 ... 010
111 ... 101
111 ... 110
111 ... 111
–FSR
–FSR + 1LSB
–FSR + 0.5LSB
+FSR – 1 LSB
+FSR – 1.5 LSB
06392-
012
ANALOG INPUT
ADC
CO
DE
(
S
T
RAI
G
HT
BI
NARY
)
Figure 26. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Analog Input
Description
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 V
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).
TYPICAL CONNECTION DIAGRAM
Figure 27 shows an example of the recommended connection
diagram for the AD7980 when multiple supplies are available.
06392-
013
AD7980
3- OR 4-WIRE INTERFACE
2.5V
V+
20Ω
V+
V–
0 TO VREF
1.8V TO 5V
100nF
10F2
2.7nF
4
100nF
REF
IN+
IN–
VDD
VIO
SDI
CNV
SCK
SDO
GND
REF1
1SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
3SEE THE DRIVER AMPLIFIER CHOICE SECTION.
4OPTIONAL FILTER. SEE THE ANALOG INPUT SECTION.
5SEE THE DIGITAL INTERFACE FOR THE MOST CONVENIENT INTERFACE MODE.
Figure 27. Typical Application Diagram with Multiple Supplies
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