參數(shù)資料
型號(hào)： MAX1359ACTL+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, QCC40
封裝： 6 X 6 MM, 0.80 MM HEIGHT, MO220, TQFN-40
文件頁(yè)數(shù)： 61/74頁(yè)
文件大?。?/td> 1214K
代理商： MAX1359ACTL+
MAX1358/MAX1359/MAX1360
16-Bit Data-Acquisition Systems with ADC, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
64
______________________________________________________________________________________
loop gain of +2V/V to provide 0 to 2.5V full-scale range
with the 1.25V reference.
DAC Bipolar Output
The MAX1358/MAX1359 DAC outputs can be config-
ured for bipolar operation using the application circuit
in Figure 26:
where N is the decimal value of the DAC’s binary input
code.
Table 24 shows digital codes (offset binary) and corre-
sponding output voltages for Figure 26 assuming
R1 = R2.
Optical Reflectometry Application with
Dual LED and Single Photodiode
Figure 27 illustrates the MAX1359 in a complete optical
reflectometry application with two transmitting LEDs
and one receiving photodiode. The LEDs transmit light
at a specific wavelength onto the sample strip and the
photodiode receives the reflections from the strip. Set
the DAC to provide appropriate bias currents for the
LEDs. Always keep the photodiodes reverse-biased or
zero-biased. SPDT1 and SPDT2 switch between the
two LEDs.
Electrochemical Sensor Operation
The MAX1358/MAX1359/MAX1360 family interface with
electrochemical sensors. The 10-bit DACs with the
force-sense buffers have the flexibility to connect to
many different types of sensors. Figure 28 shows how
to interface the MAX1360 in a self-biased electrochemi-
cal meter application. An external precision resistor
completes the transimpedance amplifier configuration
to convert the current generated by the sensor to a
voltage measurement using the ADC. The induced
error from this source is negligible due to FBA’s
extremely low input bias current. Internally, the ADC
can differentially measure directly across the external
transimpedance resistor, RF, eliminating any errors due
to voltages drifting over time, temperature, or supply
voltage. Figure 29 shows a traditional electrochemical
meter application.
Temperature Measurement with
Two Remote Sensors
Use two diode-connected 2N3904 transistors for exter-
nal temperature sensing in Figure 30. Select AIN1 and
AIN2 through the positive and negative mux, respec-
tively. For internal temperature sensor measurements,
set MUXP<3:0> to 0111, and set MUXN<3:0> to 0000.
The analog input signals feed through a PGA to the
ADC for conversion.
Strain-Gauge Measurement with
Remote Temperature Sensor
Figure 31 shows the MAX1360 in a strain-gauge mea-
surement application with a remote diode-connected
2N3904 transistor temperature sensor. Rs is the sense
resistor used for making temperature measurements.
See the Temperature with two Remote Sensors section
for more details.
Programmable-Gain Instrumentation
Amplifier
Use two op amps and two SPDT switches to implement
a programmable-gain instrumentation amplifier as
shown in Figure 32.
PWM Applications
The MAX1358/MAX1359/MAX1360 integrated PWM is
available for LCD bias control, sensor-bias voltage trim-
ming, buzzer drive, and duty-cycled sleep-mode
power-control schemes. Figure 33 shows the
MAX1358/MAX1359/MAX1360 performing LCD bias
control. A sensor-bias voltage trimming application is
shown in Figure 34. Figures 36 and 37 show the PWM
circuitry being used in a single-ended and differential
piezoelectric buzzer-driving application.
VV
N
OUT
REF
=
2
1024
1
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