MAX11600 Datasheet, PDF (19/23 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/8-/12-Channel 2-Wire Serial 8-Bit ADCs

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/8-/12-Channel 2-Wire Serial 8-Bit ADCs
Table 5. Scanning Configuration
SCAN1
0
0
SCAN0
0
1
SCANNING CONFIGURATION
Scans up from AIN0 to the input selected by CS3–CS0 (default setting).
Converts the input selected by CS3–CS0 eight times.*
MAX11600/MAX11601: Scans upper half of channels.
Scans up from AIN2 to the input selected by CS1 and CS0. When CS1 and CS0 are set for AIN0, AIN1, and
AIN2, the scanning stops at AIN2 (MAX11600/MAX11601).
MAX11602/MAX11603: Scans upper quartile of channels.
1
0
Scans up from AIN6 to the input selected by CS3–CS0. When CS3–CS0 is set for AIN0–AIN6, the scanning
stops at AIN6 (MAX11602/MAX11603).
MAX11604/MAX11605: Scans upper half of channels.
Scans up from AIN6 to the input selected by CS3–CS0. When CS3–CS0 is set for AIN0–AIN6, the scanning
stops at AIN6 (MAX11604/MAX11605).
1
1
Converts the channel selected by CS3–CS0.*
*When operating in external clock mode, there is no difference between SCAN[1:0] = 01 and SCAN[1:0] = 11 and converting continues
until a not acknowledge occurs.
Table 6. Reference Voltage, AIN_/REF, and REF Format
SEL2 SEL1 SEL0
REFERENCE
VOLTAGE
0
0
X
V_DD
0
1
X
External reference
1
0
0
Internal reference
1
0
1
Internal reference
1
1
X
Internal reference
X = Don’t care.
AIN_/REF
(MAX11600/
MAX11601/
MAX11604/
MAX11605)
Analog input
Reference input
Analog input
Analog input
Reference output
REF
(MAX11602/
MAX11603)
Not connected
Reference input
Not connected
Not connected
Reference output
INTERNAL
REFERENCE STATE
Always off
Always off
AutoShutdown
Always on
Always on
External Reference
The external reference can range from 1.0V to V_DD. For
maximum conversion accuracy, the reference must be
able to deliver up to 30µA and have an output impedance
of 1kΩ or less. If the reference has a higher output imped-
ance or is noisy, bypass it to GND as close as possible to
AIN_/REF (MAX11600/MAX11601/MAX11604/MAX11605)
or REF (MAX11602/MAX11603) with a 0.1µF capacitor.
Transfer Functions
Output data coding for the MAX11600–MAX11605 is
binary in unipolar mode and two’s complement binary in
bipolar mode with 1 LSB = V_REF/2^N where N is the num-
ber of bits (8). Code transitions occur halfway between
successive-integer LSB values. Figures 12 and 13 show
the input/output (I/O) transfer functions for unipolar and
bipolar operations, respectively.
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