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參數(shù)資料
型號(hào): AD7679ASTRL
廠商: ANALOG DEVICES INC
元件分類(lèi): ADC
英文描述: 18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
中文描述: 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48
封裝: LOW PROFILE, MS-026BBC, LQFP-48
文件頁(yè)數(shù): 16/28頁(yè)
文件大小: 1186K
代理商: AD7679ASTRL
AD7679
Transfer Functions
Except in 18-bit interface mode, the AD7679 offers straight
binary and twos complement output coding when using OB/2C.
See Figure 24 and Table 8 for the ideal transfer characteristic.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
A
03085-0-026
Figure 24. ADC Ideal Transfer Function
Table 8. Output Codes and Ideal Input Voltages
Description
FSR –1 LSB
FSR – 2 LSB
Midscale +
1 LSB
Midscale
Midscale –
1 LSB
–FSR + 1 LSB
–FSR
Analog Input
V
REF
= 4.096 V
4.095962 V
4.095924 V
31.25 μV
Straight
Binary
(Hex)
3FFFF
1
3FFFE
20001
Twos
Complement
(Hex)
1FFFF
1
1FFFE
00001
0 V
–31.25 μV
20000
1FFFF
00000
3FFFF
-4.095962 V
-4.096 V
00001
00000
2
20001
20000
2
1
This is also the code for overrange analog input (V
IN+
– V
IN–
above V
REF
– V
REFGND
).
2
This is also the code for underrange analog input (V
IN+
– V
IN–
below –V
REF
+ V
REFGND
).
AVDD
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
2.5V REF
NOTE 1
REFBUFIN
20
D
CLOCK
AD7679
μ
C/
μ
P/DSP
SERIAL PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/2C
NOTE 6
PDBUF
DVDD
50k
100nF
1M
IN+
ANALOG INPUT+
C
C
2.7nF
U1
+
NOTE 3
NOTE 4
AD8021
30
NOTE 2
NOTE 5
ADR421
10
μ
F
100nF
+
10
μ
F
100nF
+
100nF
+
10
μ
F
IN–
ANALOG INPUT–
C
C
2.7nF
U2
+
NOTE 3
NOTE 4
AD8021
30
50
100nF
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION.
2. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
3.THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
4. SEE ANALOG INPUTS SECTION.
5. OPTION, SEE POWER SUPPLY SECTION.
6. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
47
μ
F
MODE1
MODE0
NOTE 1
C
REF
REF
REFGND
03085-0-027
Figure 25. Typical Connection Diagram (Internal Reference Buffer, Serial Interface)
Rev. 0 | Page 16 of 28
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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