Datasheet

MAX11634–MAX11637
12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
16 ______________________________________________________________________________________
Table 3. Setup Register*
BIT NAME BIT FUNCTION
— 7 (MSB) Set to 0 to select setup register
— 6 Set to 1 to select setup register
CKSEL1 5 Clock mode and CNVST configuration. Resets to 1 at power-up.
CKSEL0 4 Clock mode and CNVST configuration
REFSEL1 3 Reference mode configuration
REFSEL0 2 Reference mode configuration
DIFFSEL1 1 Unipolar/bipolar mode register configuration for differential mode
DIFFSEL0 0 (LSB) Unipolar/bipolar mode register configuration for differential mode
CKSEL1 CKSEL0 CONVERSION CLOCK ACQUISITION/SAMPLING CNVST CONFIGURATION
0 0 Internal Internally timed CNVST
0 1 Internal Externally timed through CNVST CNVST
1 0 Internal Internally timed AIN7*
1 1 External (4.8MHz max) Externally timed through SCLK AIN7*
REFSEL1 REFSEL0 VOLTAGE REFERENCE AutoShutdown REF- CONFIGURATION
0 0 Internal
Reference off after scan; need
wake-up delay
AIN6
0 1 External single-ended Reference off; no wake-up delay AIN6
1 0 Internal
Reference always on; no wake-
up delay
AIN6
1 1 External differential Reference off; no wake-up delay REF-*
DIFFSEL1 DIFFSEL0 FUNCTION
0 0 No data follows the setup byte. Unipolar mode and bipolar mode registers remain unchanged.
0 1 No data follows the setup byte. Unipolar mode and bipolar mode registers remain unchanged.
1 0 1 byte of data follows the setup byte and is written to the unipolar mode register.
1 1 1 byte of data follows the setup byte and is written to the bipolar mode register.
* See below for bit details.
* The MAX11634/MAX11635 have a dedicated CNVST pin.
* The MAX11634/MAX11635 have a dedicated REF- pin.