Datasheet

AD7683
Rev. A | Page 7 of 16
04301-005
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
REF 1
+IN 2
VDD 8
DCLOCK 7
–IN 3
GND 4
D
OUT
6
CS
AD7683
5
TOP VIEW
(Not to Scale)
Figure 6. 8-Lead MSOP and QFN (LFCSP) Pin Configuration
Table 8. Pin Function Descriptions
Pin No. Mnemonic Type
1
Function
1 REF AI
Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin. Decouple the
REF pin closely to the GND pin with a ceramic capacitor of a few μF.
2 +IN AI
Analog Input. It is referred to Pin –IN. The voltage range, that is, the difference between +IN and –IN, is 0 V
to V
REF
.
3 –IN AI
Analog Input Ground Sense. Connect this pin to either the analog ground plane or a remote sense
ground.
4 GND P Power Supply Ground.
5
CS
DI
Chip Select Input. On its falling edge, it initiates the conversions. The part returns to shutdown mode as
soon as the conversion is completed. It also enables D
OUT
. When high, D
OUT
is high impedance.
6 D
OUT
DO Serial Data Output. The conversion result is output on this pin. It is synchronized to DCLOCK.
7 DCLOCK DI Serial Data Clock Input.
8 VDD P Power Supply.
1
AI = analog input; DI = digital input; DO = digital output; and P = power.