參數(shù)資料
型號(hào): AD7982BRMZRL7
廠商: Analog Devices Inc
文件頁數(shù): 5/24頁
文件大?。?/td> 0K
描述: IC ADC 18BIT 7.0MW 1MSPS 10-MSOP
產(chǎn)品培訓(xùn)模塊: Motor Control
設(shè)計(jì)資源: Converting a Single-Ended Signal with AD7982 Differential PulSAR ADC (CN0032)
Precision Single-Supply Differential ADC Driver for Industrial-Level Signals (CN0180)
標(biāo)準(zhǔn)包裝: 1,000
系列: PulSAR®
位數(shù): 18
采樣率(每秒): 1M
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 8.6mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個(gè)差分,單極
Data Sheet
AD7982
Rev. B | Page 13 of 24
Transfer Functions
The ideal transfer characteristic for the AD7982 is shown in
100...000
100...001
100...010
011...101
011...110
011...111
ADC
CO
DE
(T
W
O
S
CO
M
P
L
E
M
E
NT
)
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
06
51
3-
0
12
Figure 22. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 5 V
Digital Output
Code (Hex)
FSR – 1 LSB
+4.999962 V
Midscale + 1 LSB
+38.15 μV
0x00001
Midscale
0 V
0x00000
Midscale – 1 LSB
38.15 μV
0x3FFFF
–FSR + 1 LSB
4.999962 V
0x20001
–FSR
5 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 23 shows an example of the recommended connection
diagram for the AD7982 when multiple supplies are available.
2.7nF
20
V–
0 TO VREF
V+
4
2.7nF
20
V–
VREF TO 0
V+
4
10F2
REF1
REF
VDD
VIO
GND
IN+
IN–
SDI
SCK
SDO
CNV
AD7982
100nF
3-WIRE INTERFACE
2.5V
1.8V TO 5V
V+
ADA48412, 3
NOTES
1SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
SEE RECOMMENDED LAYOUT FIGURE 41 AND FIGURE 42.
3SEE DRIVER AMPLIFIER CHOICE SECTION.
4OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
06
51
3-
01
3
Figure 23. Typical Application Diagram with Multiple Supplies
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