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AD7653ACPZ 数据表(PDF) 17 Page - Analog Devices

部件名 AD7653ACPZ
功能描述  16-Bit 1 MSPS PulSAR Unipolar ADC with Reference
PDF  27 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7653ACPZ 数据表(HTML) 17 Page - Analog Devices

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AD7653
Data Sheet
Rev. C | Page 16 of 26
Transfer Functions
Using the OB/2C digital input, the AD7653 offers two output
codings: straight binary and twos complement. The LSB size is
VREF/65536, which is about 38.15 µV. The AD7653’s ideal
transfer characteristic is shown in Figure 21 and Table 7.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
VREF – 1.5 LSB
VREF – 1 LSB
1 LSB
0V
0.5 LSB
1 LSB = VREF/65536
02966-0-003
Figure 21. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Digital Output Code (Hex)
Description
Analog
Input
Straight
Binary
Twos
Complement
FSR – 1 LSB
2.499962 V
FFFF1
7FFF1
FSR – 2 LSB
2.499923 V
FFFE
7FFE
Midscale + 1 LSB
1.250038 V
8001
0001
Midscale
1.25 V
8000
0000
Midscale – 1 LSB
1.249962 V
7FFF
FFFF
–FSR + 1 LSB
38 µV
0001
8001
–FSR
0 V
00002
80002
1
This is also the code for overrange analog input (VIN – VINGND above
VREF – VREFGND).
2
This is also the code for underrange analog input (VIN below VINGND).
NOTES
1THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE AND INTERNAL BUFFER.
2THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
3OPTIONAL LOW JITTER.
4A 10µF CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (e.g., PANASONIC ECJ3YB0J106M).
SEE VOLTAGE REFERENCE INPUT SECTION.
AD7653
D3
CLOCK
µ
C/µP/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
DVDD
100nF
+
10µF
100nF
+
10µF
20Ω
100nF
+
10µF
ANALOG
SUPPLY
(5V)
2.7nF
CC
15Ω
ANALOG INPUT
(0VTO 2.5V)
PD
RESET
IMPULSE
WARP
SER/PAR
OB/2C
BUSY
SDOUT
SCLK
INGND
IN
REFGND
REF
GND
AVDD
DGND DVDD
OVDD
OGND
02966-A-004
U12
PDREF
PDBUF
RD
CS
BYTESWAP
CNVST
REFBUFIN1
100nF
CR4
Figure 22. Typical Connection Diagram



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