MAX1020_12 Datasheet, PDF (26/44 Pages) Maxim Integrated Products – 10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

10-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
If any of the above conditions exist, the ADC reference
is always on, but there is a 188 clock-cycle delay
before temperature-sensor measurements begin, if
requested.
Unipolar/Bipolar Registers
The final 2 bits (LSBs) of the setup register control the
unipolar-/bipolar-mode address registers. Set
DIFFSEL[1:0] = 10 to write to the unipolar-mode regis-
ter. Set bits DIFFSEL[1:0] = 11 to write to the bipolar-
mode register. In both cases, the setup command byte
Table 5c. Clock Mode 11
REFSEL1 REFSEL0
VOLTAGE
REFERENCE
OVERRIDE
CONDITIONS
AUTOSHUTDOWN
REF2
CONFIGURATION
Internal reference turns off after scan is complete. If
AIN
internal reference is turned off, there is a programmed
delay of 218 external conversion clock cycles.
0
0
Internal (DAC
and ADC)
Internal reference required. There is a programmed
AIN14/AIN10/AIN6
Temperature ^{delay of 244 external conversion clock cycles for the}
internal reference. Temperature-sensor output appears
at DOUT after 188 further external clock cycles.
AIN
Internal reference not used.
External single-
0
1
ended (REF1
for DAC and
REF2 for ADC)
Internal reference required. There is a programmed
Temperature
delay of 244 external conversion clock cycles for the
internal reference. Temperature-sensor output appears
REF2
at DOUT after 188 further external clock cycles.
Default reference mode. Internal reference turns off
AIN
after scan is complete. If internal reference is turned
off, there is a programmed delay of 218 external
Internal (ADC)
conversion clock cycles.
1
0
and external
AIN14/AIN10/AIN6
REF1 (DAC)
Internal reference required. There is a programmed
Temperature
delay of 244 external conversion clock cycles for the
internal reference. Temperature-sensor output appears
at DOUT after 188 further external clock cycles.
AIN
Internal reference not used.
External
1
1
differential
(ADC), external
REF1 (DAC)
Internal reference required. There is a programmed
Temperature
delay of 244 external conversion clock cycles for the
internal reference. Temperature-sensor output appears
REF2
at DOUT after 188 further external clock cycles.
Table 5d. Differential Select Modes
DIFFSEL1 DIFFSEL0
FUNCTION
0
0
No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged.
0
1
No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged.
1
0
1 byte of data follows the command setup byte and is written to the unipolar-mode register.
1
1
1 byte of data follows the command setup byte and is written to the bipolar-mode register.
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