MAX11634 Datasheet, PDF (16/24 Pages) Maxim Integrated Products – 12-Bit, 300ksps ADCs with Differential

12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
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
CKSEL0
5
Clock mode and CNVST configuration. Resets to 1 at power-up.
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
*See below for bit details.
CKSEL1 CKSEL0
CONVERSION CLOCK
0
0
Internal
0
1
Internal
1
0
Internal
1
1
External (4.8MHz max)
*The MAX11634/MAX11635 have a dedicated CNVST pin.
ACQUISITION/SAMPLING
Internally timed
Externally timed through CNVST
Internally timed
Externally timed through SCLK
CNVST CONFIGURATION
CNVST
CNVST
AIN7*
AIN7*
REFSEL1 REFSEL0
VOLTAGE REFERENCE
0
0
Internal
0
1
External single-ended
1
0
Internal
1
1
External differential
*The MAX11634/MAX11635 have a dedicated REF- pin.
AutoShutdown
Reference off after scan; need
wake-up delay
Reference off; no wake-up delay
Reference always on; no wake-
up delay
Reference off; no wake-up delay
REF- CONFIGURATION
AIN6
AIN6
AIN6
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.
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