EVAL-SDP-CB1Z 데이터 시트보기 (PDF) - Analog Devices
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EVAL-SDP-CB1Z Datasheet PDF : 26 Pages
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Data Sheet
AD7687
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
REF 1
VDD 2
IN+ 3
IN– 4
GND 5
10 VIO
AD7687
TOP VIEW
(Not to Scale)
9 SDI
8 SCK
7 SDO
6 CNV
REF 1
VDD 2
IN+ 3
IN– 4
GND 5
AD7687
TOP VIEW
(Not to Scale)
10 VIO
9 SDI
8 SCK
7 SDO
6 CNV
Figure 4. 10-Lead MSOP Pin Configuration
NOTES
1. FOR THE LFCSP ONLY, THE EXPOSED
PADDLE MUST BE CONNECTED TO GND.
Figure 5. 10-Lead LFCSP Pin Configuration
Table 8. Pin Function Descriptions
Pin No. Mnemonic Type1 Function
1
REF
AI
Reference Input Voltage. The REF range is from 0.5 V to VDD, referred to the GND pin. Place a 10 μF
decoupling capacitor as close to the pin as possible.
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 leading edge, it initiates a conversion and selects
the interface mode: chain or CS (depending on the state of SDI). In CS mode, CNV enables the SDO pin
when low. In chain mode, the data is read while CNV is high.
7
SDO
DO Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK. SDO also acts as
the BUSY indicator if the feature is enabled.
8
SCK
DI
Serial Data Clock Input. This input primarily shifts data out on SDO when data is valid. In chain mode, the
state of SCK determines if the BUSY indicator feature is enabled. If SCK is low during the CNV rising edge,
the BUSY feature is disabled. If it is high during the CNV rising edge, the BUSY feature is enabled.
9
SDI
DI
Serial Data Input. This input serves multiple functions. 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, and 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).
EPAD
N/A For the LFCSP only, the exposed paddle must be connected to GND.
1AI means analog input, DI means digital input, DO means digital output, P means power, and N/A means not applicable.
Rev. E | Page 9 of 26
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