MAX1111CE Datasheet, PDF (17/20 Pages) Maxim Integrated Products – 2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs

+2.7V, Low-Power, Multichannel,
Serial 8-Bit ADCs
CLOCK
MODE
INTERNAL
SHDN
SETS EXTERNAL
CLOCK MODE
DIN
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
Figure 14a. Power-Down Modes, External Clock Timing Diagram
EXTERNAL
DATA
INVALID
POWER-
DOWN
POWERED
UP
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 MAX1110/MAX1111 with the internal refer-
ence, connect REFIN to REFOUT. The full-scale range
of the MAX1110/MAX1111 with the internal reference is
typically 2.048V with unipolar inputs, and ±1.024V 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, unipo-
lar I/O transfer function, and Figure 16 shows the bipolar
I/O transfer function when using a 2.048V reference.
Code transitions occur at integer LSB values. Output cod-
ing is binary, with 1 LSB = 8mV (2.048V/256) for unipolar
operation and 1 LSB = 8mV [(2.048V/2 - -2.048V/2)/256]
for bipolar operation.
______________________________________________________________________________________ 17