MAX1112 Datasheet, PDF (17/20 Pages) Maxim Integrated Products – 5V, Low-Power, Multi-Channel, Serial 8-Bit ADCs Internal 4.096V Reference

+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
CLOCK
MODE
SHDN
DIN
INTERNAL
SETS EXTERNAL
CLOCK MODE
SXXXXX11
DOUT
DATA VALID
MODE
POWERED UP
EXTERNAL
SETS POWER-
DOWN MODE
SXXXXX0 1
SETS EXTERNAL
CLOCK MODE
SXX XXX1 1
DATA VALID
POWER-
DOWN
POWERED UP
EXTERNAL
DATA
INVALID
POWER-
DOWN
POWERED
UP
Figure 14a. Power-Down Modes, External Clock Timing Diagram
DIN
DOUT
SSTRB
MODE
SETS INTERNAL
CLOCK MODE
SXXXXX10
INTERNAL CLOCK MODE
SETS POWER-DOWN MODE
SXXXXX0 0
DATA VALID
DATA VALID
CONVERSION
POWERED UP
CONVERSION
POWER-DOWN
S
POWERED
UP
Figure 14b. Power-Down Modes, Internal Clock Timing Diagram
Internal Reference
To use the MAX1112/MAX1113 with the internal refer-
ence, connect REFIN to REFOUT. The full-scale range
of the MAX1112/MAX1113 with the internal reference is
typically 4.096V with unipolar inputs, and ±2.048V with
bipolar inputs. The internal reference should be
bypassed to AGND with a 1µF capacitor placed as
close to the REFIN pin as possible.
Transfer Function
Table 4 shows the full-scale voltage ranges for unipolar
and bipolar modes. Figure 15 depicts the nominal,
unipolar I/O transfer function, and Figure 16 shows the
bipolar I/O transfer function when using a 4.096V refer-
ence. Code transitions occur at integer LSB values.
Output coding is binary, with 1 LSB = 16mV
(4.096V/256) for unipolar operation and 1 LSB = 16mV
[(4.096V/2 - -4.096V/2)/256] for bipolar operation.
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