Datasheet

AD7684
Rev. A | Page 7 of 16
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
04302-006
REF 1
+IN 2
–IN 3
GND 4
VDD 8
DCLOCK 7
D
OUT
6
CS 5
AD7684
TOP VIEW
(Not to Scale)
Figure 6. 8-Lead MSOP Pin Configuration
Table 7. Pin Function Descriptions
Pin No. Mnemonic Type
1
Description
1 REF AI
Reference Input Voltage. The REF range is from 0.5 V to VDD. This pin is referred to the GND pin and
should be decoupled closely to the GND pin with a ceramic capacitor of a few μF.
2 +IN AI
Differential Positive Analog Input. Referenced to −IN. The input range for +IN is between 0 V and V
REF
,
centered about V
REF
/2 and must be driven 180° out of phase with −IN.
3 –IN AI
Differential Negative Analog Input. Referenced to +IN. The input range for −IN is between V
REF
and 0 V,
centered about V
REF
/2 and must be driven 180° out of phase with +IN.
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 complete. 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.