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AD7944BCPZ датащи(PDF) 14 Page - Analog Devices

номер детали AD7944BCPZ
подробное описание детали  14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP
PDF  28 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD7944BCPZ датащи(HTML) 14 Page - Analog Devices

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AD7944
Rev. 0 | Page 14 of 28
Transfer Functions
The ideal transfer characteristic for the AD7944 is shown in
Figure 22 and Table 7.
000 ... 000
000 ... 001
000 ... 010
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
111 ... 101
111 ... 110
111 ... 111
Figure 22. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input,
VREF = 4.096 V
Digital Output
Code (Hex)
FSR − 1 LSB
4.09575 V
0x3FFF1
Midscale + 1 LSB
2.04825 V
0x2001
Midscale
2.048 V
0x2000
Midscale − 1 LSB
2.04775 V
0x1FFF
−FSR + 1 LSB
250 μV
0x0001
−FSR
0 V
0x00002
1 This is also the code for an overranged analog input (VIN+ − VIN− above
VREF − REFGND).
2 This is also the code for an underranged analog input (VIN+ − VIN− below
REFGND).
TYPICAL CONNECTION DIAGRAM
Figure 23 shows an example of the recommended connection
diagram for the AD7944 when multiple supplies are available.
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
AD7944
GND
REF
AVDD,
DVDD
VIO
BVDD
5V
2.5V
1.8V
TO
2.7V
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE
INTERFACE:
SPI, CS,
DAISY CHAIN
(TURBO = LOW)
TURBO
10µF
IN+
IN–
2.7nF
15
Ω
V–
0V TO VREF
V+
Figure 23. Typical Application Diagram with Multiple Supplies



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