MAX1112/MAX1113
+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
______________________________________________________________________________________
17
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 1F 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.
POWERED UP
POWER-
DOWN
POWERED
UP
POWERED UP
DATA VALID
DATA
INVALID
EXTERNAL
INTERNAL
SX XXXX 11
S
0 1
XX
X
X X XXX
S1 1
POWER-
DOWN
MODE
DOUT
DIN
CLOCK
MODE
SHDN
SETS EXTERNAL
CLOCK MODE
SETS EXTERNAL
CLOCK MODE
SETS POWER-
DOWN MODE
Figure 14a. Power-Down Modes, External Clock Timing Diagram
POWER-DOWN
POWERED
UP
POWERED UP
DATA VALID
INTERNAL CLOCK MODE
SX XXXX 10
S
0 0
XX
X
S
MODE
DOUT
DIN
SETS INTERNAL
CLOCK MODE
SETS POWER-DOWN MODE
CONVERSION
SSTRB
Figure 14b. Power-Down Modes, Internal Clock Timing Diagram
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