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MAX1407 Datasheet, PDF (43/48 Pages) Maxim Integrated Products – Low-Power, 16-Bit Multichannel DAS with Internal Reference,10-Bit DACs, and RTC
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Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
AUX.
VOLTAGE
INPUTS
MAX1407
MAX1409
MAX1414
REF
10-BIT DAC
IN0
IN1
IN2
IN3
OUT1
IF
RF
FB1
WE
SENSOR
CE
BAND
GAP
BUF REF
4.7µF
ALL I/O AVAILABLE AS INPUTS TO ADC AND COMPARATOR.
MAX1409 HAS IN0, OUT1, FB1, AND REF ONLY.
Figure 23. Self-Biased Two Electrode Potentiostat Application
AUX.
VOLTAGE
INPUTS
MAX1407
MAX1414
REF
10-BIT DAC
IN0
IN1
IN2
IN3
REF
10-BIT DAC
OUT1
IF
RF
FB1
OUT2
WE
SENSOR
CE
FB2
BAND
GAP
REF
BUF
4.7µF
ALL I/O AVAILABLE AS INPUTS TO ADC AND COMPARATOR.
Figure 24. Driven Two Electrode Potentiostat Application
AUX.
VOLTAGE
INPUTS
MAX1407
MAX1414
REF
10-BIT DAC
IN0
IN1
IN2
IN3
REF
10-BIT DAC
OUT1
FB1
FB2
OUT2
IF
RF
WE
RE
CE
SENSOR
BAND
GAP
REF
BUF
4.7µF
ALL I/O AVAILABLE AS INPUTS TO ADC AND COMPARATOR.
Figure 25. Driven Three Electrode Potentiostat Application
counter electrode is configured as a transimpedance
amplifier to measure the current. Figure 25 shows a three
electrode potentiostat application that is driven at all the
electrodes and measured at the working electrode. With
this application, the DAC connected to the working elec-
MAX1407
MAX1414
REF
10-BIT DAC
OUT1
FB1
VBAT
LED
QB
AUX.
VOLTAGE
INPUTS
REF
10-BIT DAC
IN0
IN1 BAND
IN2 GAP
IN3
RB
OUT2
IF
RF
FB2
BUF REF
4.7µF
PHOTO-
DIODE
ALL I/O AVAILABLE AS INPUTS TO ADC AND COMPARATOR.
Figure 26. Optical Reflectometry Application
trode sets the bias voltage relative to the reference elec-
trode and also measures the current that the sensor pro-
duces. The DAC connected to the reference and counter
electrodes takes advantage of the force/sense outputs to
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