FAQs:  MAX1452 MAX1452, MAX1455 MAX1455

The MAX1452/MAX1455 are high-performance signal conditioners with analog output that have been widely accepted and used in a variety of industrial and automotive applications.

Note: In this document, the term signal conditioner refers to the MAX1452 and MAX1455. All questions, answers, and comments below apply equally to both parts, unless a specific part is referenced.

What is the difference between the MAX1452 and the MAX1455?
What is the sensor-excitation mode of these signal conditioners?
Can the MAX1452 be used in voltage-bridge-drive mode?
Can the MAX1452 be used in 4-20mA applications?
Can the MAX1455 be used in 4-20mA applications?
What is the smallest sensor output that can produce 4V of span (VDD = 5V) without requiring external amplification?
What is the largest sensor output that can produce 4V of span (VDD = 5V), without requiring an external circuit?
When operating in digital mode and the output MUX is activated for "infinite" output duration, communication is blocked for nine seconds before it is released to accept digital commands. This is unacceptable in a production environment. How can I get around the unnecessary wait after I finish reading the output from a DMM?
Do I need a pull-down resistor on the UNLOCK pin?
What are the limits for the bridge-excitation voltage?
What are the limits for the analog output voltage?
My sensor may be at a different temperature than the signal conditioner. Can I still compensate the sensor?
Do I have to use the offset TC DAC and FSOTC DAC in my compensation algorithm?
Is there any advantage in using the offset TC DAC and FSOTC DAC in addition to the lookup tables?
What are the recommended values for the offset TC DAC and FSOTC DAC, if they are not used for first-order temperature compensation?
Can the coefficients in the OFF lookup table have different signs?
Must I use the Serial.dll provided with the EV kit software to operate in digital mode?
Must I use the KEY (interface adapter) provided by Maxim to communicate with the signal conditioner?
Must I use the same power source for the signal conditioner and the KEY?
During the compensation process, can I connect the +5V of the power supply directly to the VDD of the signal conditioner?
I see a very low-frequency noise, 2Hz to 3Hz for example, on the output. What causes this?
I cannot see the internal oscillator signal at the CLK1M pin. What is the problem?
My signal conditioner does not start in analog mode. What is the problem?
What is the VDD voltage level which indicates that the signal conditioner is completely turned off?
What is the minimum startup VDD voltage for the signal conditioner?
What is the factory setting for the flash memory content?
Is the signal conditioner's default operating mode digital or analog?
What is the factory setting of the Configuration register?
The EV kit software does not allow writing to the oscillator bits in the Configuration register. How can I write to these bits?
How critical are the oscillator trim bits in the configuration register?
How do I trim the oscillator frequency to 1MHz?
What is included in the EV kit package?
I see a 1kHz ripple at the output signal. How can I eliminate it?
The current drawn by the KEY, approximately 40mA, is interfering with the 4-20mA current loop calibration. How can I fix this?
What are the voltage threshold (logic) levels for the DIO signal?
Do I have to use a Wheatstone bridge-type sensor to utilize these signal conditioners?
My sensor has very low impedance. Can I still use the MAX1452 as a signal conditioner?
My sensor has very high impedance. Can I still use the MAX1452 as a signal conditioner?
My sensor has more than 68mV/V sensitivity. Can I still use these signal conditioners?
I get the "divide by zero" error when I launch the EV kit software. What is the problem?
I have downloaded and installed the latest EV kit software from the website, but when I run the software I get the message, "missing DIPortIO.dll." What is the problem and what should I do?
Is there any software stored in flash memory?
Can the signal conditioner be operated beyond the product's operating temperature range?
Can I read the signal conditioner's output digitally?
What are the differences between the –NS and –CS EV kits?
Should the serial cable required between the PC and KEY be a null modem (straight through) or cross cable?
When I call the DLLs from Visual Basic, I get the error. What do I need to do?