MAX1258 Maxim Integrated Products, MAX1258 Datasheet - Page 26

• Manufacturer Part Number: MAX1258
• Description: Multichannel ADCs/DACs
• Manufacturer: Maxim Integrated Products

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Table 5c. Clock Mode 11
Table 5d. Differential Select Modes
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
The ADC reference is always on if any of the following
conditions are true:
1)The FBGON bit is set to one in the reset register.
2)At least one DAC output is powered up and
26
REFSEL1 REFSEL0
DIFFSEL1 DIFFSEL0
REFSEL[1:0] (in the setup register) = 00.
0
0
1
1
______________________________________________________________________________________
0
0
1
1
0
1
0
1
0
1
0
1
External single-
(ADC), external
REF2 for ADC)
No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged.
No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged.
1 byte of data follows the command setup byte and is written to the unipolar-mode register.
1 byte of data follows the command setup byte and is written to the bipolar-mode register.
Internal (ADC)
REFERENCE
Internal (DAC
ended (REF1
for DAC and
and external
REF1 (DAC)
REF1 (DAC)
VOLTAGE
differential
and ADC)
External
CONDITIONS
Temperature
Temperature
Temperature
Tem p er atur e
OVERRIDE
AIN
AIN
AIN
AIN
Inter nal r efer ence tur ns off after scan i s com p l ete. If
i nter nal r efer ence i s tur ned off, ther e i s a p r og r am m ed
d el ay of 218 exter nal conver si on cl ock cycl es.
Inter nal r efer ence r eq ui r ed . Ther e i s a p r og r am m ed
d el ay of 244 exter nal conver si on cl ock cycl es for the
i nter nal r efer ence. Tem p er atur e- sensor outp ut ap p ear s
at D OU T after 188 fur ther exter nal cl ock cycl es.
Internal reference not used.
Inter nal r efer ence r eq ui r ed . Ther e i s a p r og r am m ed
d el ay of 244 exter nal conver si on cl ock cycl es for the
i nter nal r efer ence. Tem p er atur e- sensor outp ut ap p ear s
at D OU T after 188 fur ther exter nal cl ock cycl es.
Default reference mode. Internal reference turns off
after scan is complete. If internal reference is turned
off, there is a programmed delay of 218 external
conversion clock cycles.
Inter nal r efer ence r eq ui r ed . Ther e i s a p r og r am m ed
d el ay of 244 exter nal conver si on cl ock cycl es for the
i nter nal r efer ence. Tem p er atur e- sensor outp ut ap p ear s
at D OU T after 188 fur ther exter nal cl ock cycl es.
Internal reference not used.
Inter nal r efer ence r eq ui r ed . Ther e i s a p r og r am m ed
d el ay of 244 exter nal conver si on cl ock cycl es for the
i nter nal r efer ence. Tem p er atur e- sensor outp ut ap p ear s
at D OU T after 188 fur ther exter nal cl ock cycl es.
3)At least one DAC is powered down through the
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.
100kΩ to V
FUNCTION
AUTOSHUTDOWN
REF
and REFSEL[1:0] = 00.
CONFIGURATION
AIN14/AIN10/AIN6
AIN14/AIN10/AIN6
REF2
REF2
REF2