參數(shù)資料
型號: AD7986BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 6/28頁
文件大?。?/td> 0K
描述: IC ADC 18BIT 2MSPS SAR 20LFCSP
產(chǎn)品培訓(xùn)模塊: Motor Control
標(biāo)準(zhǔn)包裝: 1
位數(shù): 18
采樣率(每秒): 2M
數(shù)據(jù)接口: MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 34mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 20-LFCSP-VQ
包裝: 托盤
輸入數(shù)目和類型: 1 個差分,雙極
產(chǎn)品目錄頁面: 780 (CN2011-ZH PDF)
AD7986
Rev. B | Page 14 of 28
Transfer Functions
The ideal transfer characteristic for the AD7986 is shown in
100 ... 000
100 ... 001
100 ... 010
011 ... 101
011 ... 110
011 ... 111
A
D
C
O
D
E
(T
W
O
S
C
O
MPL
EMEN
T
)
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
07956-
012
Figure 22. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
V
REF = 5 V
Digital Output
Code (Hex)
FSR 1 LSB
+4.095969 V
Midscale + 1 LSB
+31.25 V
0x00001
Midscale
0 V
0x00000
Midscale 1 LSB
31.25 V
0x3FFFF
FSR + 1 LSB
4.095969 V
0x20001
FSR
4.096 V
0x200002
1 This is also the code for an overranged analog input (V
IN+ VIN above VREF
REFGND).
2 This is also the code for an underranged analog input (V
IN+ VIN below REFGND).
TYPICAL CONNECTION DIAGRAM
Figure 23 shows an example of the recommended connection
diagram for the AD7986 when multiple supplies are available.
2.7nF
15
V–
0V TO VREF
V+
2.7nF
15
V–
V+
IN–
AD7986
IN+
REF
AVDD,
DVDD
DD
VIO
BVDD
5V
2.5V
1.8V TO 2.7V
VIO
SDI
SCLK
SDO
CNV
TURBO
10F
VREF TO 0V
GND1
07956-
016
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
3- OR 4-WIRE
INTERFACE:
SPI, CS
DAISY CHAIN (TURBO = LOW)
Figure 23. Typical Application Diagram with Multiple Supplies
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