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AD7981HFZ датащи(PDF) 7 Page - Analog Devices

номер детали AD7981HFZ
подробное описание детали  High Temperature, 16-Bit, 600 kSPS PulSAR ADC
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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Data Sheet
AD7981
Rev. B | Page 7 of 26
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 4. 10-Lead MSOP Pin Configuration
Figure 5. 10-Lead FLATPACK Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1
REF
AI
Reference Input Voltage. The REF range, VREF, is from 2.4 V to 5.1 V. VREF is referred to the GND pin.
Decouple REF with a 10 μF capacitor as close as possible to the pin.
2
VDD
P
Power Supply.
3
IN+
AI
Analog Input. This pin is referred to IN−. The voltage range, for example, the difference between IN+ and
IN−, is 0 V to VREF.
4
IN−
AI
Analog Input Ground Sense. Connect this pin to the analog ground plane or to a remote sense ground.
5
GND
P
Power Supply Ground.
6
CNV
DI
Conversion Input. This input has multiple functions. On its leading edge, it initiates the conversions and
selects the interface mode of the device: chain or CS mode. In CS mode, it enables the SDO pin when low.
In chain mode, read the data when CNV is high.
7
SDO
DO
Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.
8
SCK
DI
Serial Data Clock Input. When the device is selected, the conversion result is shifted out by this clock.
9
SDI
DI
Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as follows:
Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data input
to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data level on
SDI is output on SDO with a delay of 16 SCK cycles.
CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable
the serial output signals when low. If SDI or CNV is low when the conversion is complete, the busy
indicator feature is enabled.
10
VIO
P
Input/Output Interface Digital Power. VIO is nominally at the same supply as the host interface (1.8 V,
2.5 V, 3 V, or 5 V).
1AI is the analog input, P is the power, DI is the digital input, and DO is the digital output.
REF 1
VDD 2
IN+ 3
IN– 4
GND 5
VIO
10
SDI
9
SCK
8
SDO
7
CNV
6
AD7981
TOP VIEW
(Not to Scale)
REF 1
VDD 2
IN+ 3
IN– 4
VIO
10
SDI
9
SCK
8
SDO
7
GND 5
CNV
6
AD7981
TOP VIEW
(Not to Scale)


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