MAX1414CAI+ Maxim Integrated Products, MAX1414CAI+ Datasheet - Page 40

• Manufacturer Part Number: MAX1414CAI+
• Description: IC DAS 16BIT LP 28-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Data Acquisition System (DAS)r

Specifications of MAX1414CAI+

• Resolution (bits): 16 b
• Sampling Rate (per Second): 60
• Data Interface: Serial
• Voltage Supply Source: Analog and Digital
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Number Of Converters: 1
• Resolution: 16 bit
• Interface Type: Serial (4-Wire, SPI, QSPI, Microwire)
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Power Dissipation: 762 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
(BIP = 0). To initiate an ADC conversion: 1) Enter Run
mode by addressing the Run register 2) Select the
desired channels for conversion by writing to the MUX
register, (e.g., 94h selects IN1 for the positive channel
and IN2 for the negative channel) 3) Initiate the conver-
sion by writing to the ADC register, (e.g., 01h). The first
conversion result becomes available in 100ms. The ADC
40
Figure 16. Unipolar Output Circuit
Figure 17. Unipolar Rail-to-Rail Output Circuit
______________________________________________________________________________________
THE MAX1409 HAS ONE DAC
V
REF
THE MAX1409 HAS ONE DAC
V
REF
= 1.25V
= 1.25V
MAX1407/MAX1409/MAX1414
REF
MAX1407/MAX1409/MAX1414
REF
DAC 1
DAC 2
DAC 1
DAC 2
AGND
AGND
DGND
DGND
FB1
FB2
FB1
FB2
10kΩ
10kΩ
10kΩ
10kΩ
OUT2
OUT1
OUT2
OUT1
will keep doing conversions at a rate of 30Hz until pow-
ered down.
To perform an on-chip offset calibration on a specific
configuration, write to the ADC register with the MODE
bit and STA1 bit set to 1. The ADC will do one calibra-
tion using the inputs to the ADC specified in the MUX
register and then stop. The calibration result will be
stored in the Offset register in two’s complement form.
Subsequent ADC conversion results will have the offset
value subtracted before written to the DATA register.
The MODE bit will be reset to 0 automatically upon
completion of the calibration. The ADC is now ready for
a normal conversion.
The offset for a given ADC configuration can be stored
by the µP to avoid another ADC recalibration. Write the
stored offset back to the offset register when returning
back to that particular ADC configuration where the cal-
ibration was taken. Subsequent ADC conversion results
will have the offset value subtracted before they are
written to the DATA register.
For a unipolar output, the output voltages and the refer-
ence have the same polarity. Figure 16 shows the
MAX1407/MAX1409/MAX1414s’ unipolar output circuit,
which is also the typical operating circuit for the DACs.
Table 11 lists some unipolar input codes and their cor-
responding output voltages.
For larger output swing see Figure 17. This circuit
shows the output amplifiers configured with a closed-
loop gain of +2V/V to provide 0 to 2.5V full-scale range
with the 1.25V reference.
The MAX1407/MAX1409/MAX1414 DAC outputs can be
configured for bipolar operation using the application
circuit on Figure 18:
Figure 18. Bipolar Output Circuit
MAX1407/MAX1409/MAX1414
REF
DAC_
R1
DAC Unipolar Output
FB_
OUT_
DAC Bipolar Output
R2 = R1
+5V
-5V
R2
V
OUT