參數(shù)資料
型號(hào): AD7690BRMZ
廠商: Analog Devices Inc
文件頁數(shù): 5/24頁
文件大小: 0K
描述: IC ADC 18BIT 400KSPS 10MSOP
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
位數(shù): 18
采樣率(每秒): 400k
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): 20mW
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: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 管件
輸入數(shù)目和類型: 1 個(gè)差分,雙極
產(chǎn)品目錄頁面: 778 (CN2011-ZH PDF)
AD7690
Rev. B | Page 13 of 24
Transfer Functions
The ideal transfer characteristic for the AD7690 is shown in
100...000
100...001
100...010
011...101
011...110
011...111
A
D
C
CO
DE
(T
W
O
S
CO
M
P
L
E
M
E
NT
)
ANALOG INPUT
+FSR – 1.5LSB
+FSR – 1LSB
–FSR + 1LSB
–FSR
–FSR + 0.5LSB
05
79
2-
0
07
Figure 25. 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 26 shows an example of the recommended connection
diagram for the AD7690 when multiple supplies are available.
AD7690
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE INTERFACE5
100nF
5V
10F2
V+
V–
1.8V TO VDD
REF1
0 TO VREF
15
2.7nF
4
V+
V–
VREF TO 0
15
2.7nF
ADA4841-23
4
1 SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2 CREF IS USUALLY A 10F CERAMIC CAPACITOR (X5R).
3 SEE TABLE 8 FOR ADDITIONAL RECOMMENDED AMPLIFIERS.
4 OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
5 SEE THE DIGITAL INTERFACE SECTION FOR MOST CONVENIENT INTERFACE MODE.
05
79
2-
0
08
Figure 26. Typical Application Diagram with Multiple Supplies
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