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AD7984 데이터시트(PDF) 7 Page - Analog Devices

부품명 AD7984
상세설명  18-Bit, 1.33 MSPS PulSAR 10.5 mW ADC in MSOP/LFCSP
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AD7984 데이터시트(HTML) 7 Page - Analog Devices

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Data Sheet
AD7984
Rev. B | Page 7 of 24
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 4. 10-Lead MSOP Pin Configuration
Figure 5. 10-Lead LFCSP Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1
REF
AI
Reference Input Voltage. The REF range is 2.9 V to 5.1 V. This pin is referred to the GND pin and
should be decoupled closely to the GND pin with a 10 μF capacitor.
2
VDD
P
Power Supply.
3
IN+
AI
Differential Positive Analog Input.
4
IN−
AI
Differential Negative Analog Input.
5
GND
P
Power Supply Ground.
6
CNV
DI
Convert Input. This input has multiple functions. On its rising edge, it initiates the conversions
and selects the interface mode of the part: chain mode or CS mode. In CS mode, the SDO pin is
enabled when CNV is low. In chain mode, the data should be read 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 part 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 18 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. Nominally at the same supply as the host interface
(1.8 V, 2.5 V, 3 V, or 5 V).
1 AI = analog input, DI = digital input, DO = digital output, and P = power.
REF 1
VDD 2
IN+ 3
IN– 4
GND 5
VIO
10
SDI
9
SCK
8
SDO
7
CNV
6
AD7984
TOP VIEW
(Not to Scale)
REF
VDD
IN+
IN–
GND
VIO
SDI
SCK
SDO
CNV
1
2
3
4
10
9
8
7
5
6
*EXPOSED PADDLE CAN BE CONNECTED
TO GROUND.
AD7984
(EXPOSED
PAD)*


유사한 부품 번호 - AD7984_15

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