Rainbow Electronics MAX1083 - Manual (Page 10)

MAX1082/MAX1083
300ksps/400ksps, Single-Supply, 4-Channel,
Serial 10-Bit ADCs with Internal Reference
10 ______________________________________________________________________________________
Pin Description
Positive Supply Voltage V DD2 16
Input to the Reference-Buffer Amplifier. To disable the reference-buffer amplifier, connect REFADJ to V DD1 . REFADJ 9
Serial Strobe Output. SSTRB pulses high for one clock period before the MSB decision. High imped-
ance when CS is high.
SSTRB 12
Serial-Data Input. Data is clocked in at SCLK’s rising edge. DIN 13
Active-Low Chip Select. Data will not be clocked into DIN unless CS is low. When CS is high, DOUT
and SSTRB are high impedance.
CS 14
Serial-Clock Input. Clocks data in and out of serial interface and sets the conversion speed. (Duty
cycle must be 40% to 60%.)
SCLK 15
Reference-Buffer Output/ADC Reference Input. Reference voltage for analog-to-digital conversion.
In internal reference mode, the reference buffer provides a 2.500V nominal output, externally
adjustable at REFADJ. In external reference mode, disable the internal buffer by pulling REFADJ to
V
DD1
.
REF 8
Ground GND 10
Serial-Data Output. Data is clocked out at SCLK’s rising edge. High impedance when CS is high. DOUT 11
Active-Low Shutdown Input. Pulling SHDN low shuts down the device, reducing supply current to 2µA
(typ).
SHDN 7
Ground Reference for Analog Inputs. COM sets zero-code voltage in single-ended mode. Must be
stable to ±0.5LSB.
COM 6
PIN
Positive Supply Voltage V DD1 1
FUNCTION NAME
V DD2
3k
GND
DOUT
C LOAD
20pF
C LOAD
20pF
GND
3k
DOUT
a) High-Z to V
OH
and V
OL
to V
OH b) High-Z to V
OL
and V
OH
to V
OL
V DD2
3k
GND
DOUT
C LOAD
20pF
C LOAD
20pF
GND
3k
DOUT
a) V OH to High-Z b) V OL to High-Z
Figure 1. Load Circuits for Enable Time Figure 2. Load Circuits for Disable Time
Sampling Analog Inputs CH0–CH3 2–5