Pin description – Rainbow Electronics MAX1111 User Manual
Page 7
MAX1110/MAX1111
+2.7V, Low-Power, Multichannel,
Serial 8-Bit ADCs
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7
______________________________________________________________Pin Description
16
SSTRB
Serial-Strobe Output. In internal clock mode, SSTRB goes low when the MAX1110/
MAX1111 begin the A/D conversion and goes high when the conversion is done.
In external clock mode, SSTRB pulses high for two clock periods before the MSB is
shifted out. High impedance when CS is high (external clock mode only).
20
V
DD
Positive Supply Voltage, +2.7V to +5.5V
18
CS
Active-Low Chip Select. Data is not clocked into DIN unless CS is low. When CS is
high, DOUT is high impedance. The voltage at CS may exceed V
DD
(up to 5.5V).
19
SCLK
Serial-Clock Input. Clocks data in and out of serial interface. In external clock mode,
SCLK also sets the conversion speed (duty cycle must be 45% to 55%). The voltage at
SCLK may exceed V
DD
(up to 5.5V).
17
DIN
Serial-Data Input. Data is clocked in at SCLK’s rising edge. The voltage at DIN may
exceed V
DD
(up to 5.5V).
12
REFOUT
Internal Reference Generator Output. Bypass with a 1µF capacitor to AGND.
14
DGND
Digital Ground
15
DOUT
Serial-Data Output. Data is clocked out on SCLK’s falling edge. High impedance when
CS is high.
13
AGND
Analog Ground
10
SHDN
Three-Level Shutdown Input. Normally floats. Pulling SHDN low shuts the MAX1110/
MAX1111 down to 10µA (max) supply current; otherwise, the devices are fully opera-
tional. Pulling SHDN high shuts down the internal reference.
11
REFIN
Reference Voltage Input for Analog-to-Digital Conversion. Connect to REFOUT to use
the internal reference.
5–8
CH4–CH7
Sampling Analog Inputs
1–4
CH0–CH3
Sampling Analog Inputs
+3V
3k
C
LOAD
DGND
DOUT
C
LOAD
DGND
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
Figure 1. Load Circuits for Enable Time
+3V
3k
C
LOAD
DGND
DOUT
C
LOAD
DGND
3k
DOUT
a) V
OH
to High-Z
b) V
OL
to High-Z
Figure 2. Load Circuits for Disable Time
12
16
14
15
13
8
10
11
9
6
7
—
1–4
5
9
COM
Ground Reference for Analog Inputs. Sets zero-code voltage in single-ended mode.
Must be stable to ±0.5LSB.
PIN
MAX1111
NAME
FUNCTION
MAX1110