MAX12900AATJ+ by Analog Devices

Ultra-Low-Power 4-20mA Sensor Transmitter


The MAX12900 is an ultra-low-power, highly integrated 4-20mA sensor transmitter. The MAX12900 integrates ten building blocks in a small package: a wide input supply voltage LDO, two conditioner circuits for pulse-width modulated (PWM) inputs, two low-power, low-drift, general purpose operational amplifiers (op amp) one wide bandwidth, zero-offset drift operational amplifier; two diagnostic comparators, a power-up sequencer with power good output to allow for a smooth power-up, and a low-drift voltage reference. The MAX12900 converts PWM data from a microcontroller into current over a 4-20mA loop with two, three, or four wire configurations. The equivalent to an ultra-low-power, high-resolution, digital-to-analog converter is realized with the combination of two-PWM signals received from a microcontroller, the two conditioner circuits, and an active filter built with the integrated low-power op amp. The outputs of the two conditioner circuits provide a stable PWM amplitude over voltage supply and temperature variation. The wide bandwidth amplifier, in combination with a discrete transistor, converts a voltage input into a current output and allows HART and Foundation Fieldbus H1 signal modulation. The zero-offset operational amplifier and the low-drift voltage reference provide negligible error over wide temperature. The low-power operational amplifier and comparators provide building blocks for enhanced diagnostic features. Supply rail monitoring, output current readback, open circuit and failure detection are a few examples of diagnostic features. All these features, as well as ultra-low-power and high accuracy make the MAX12900 ideal for loop-powered smart sensor transmitters for industrial application. The MAX12900 is available in 5mm x 5mm 32-pin TQFN package and operates over a wide industrial temperature range of -40°C to +125°C.

Where to Buy

Prices starting from US$3.45

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from US$5.94
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Features

Wide Input Supply Range: 4.0V to 36V
Ultra-Low-Power Consumption: 170μA (typ)
High Linearity: 0.01% (Max Error)
High Resolution: Up to 16 Bit
Low Drift Voltage Reference: 10ppm/°C max
Wide Temperature Range: -40°C to +125°C
Small Package: 5mm x 5mm x 0.8mm 32-pin TQFN

Specifications

Voltage Reference Output (V) 2.5
PWMA,PWMB Supply Voltage (V) 3.0 to 5.5
OP1,OP2 Input Offset Voltage (mV) 1
OP1,OP2 GBWP (kHz) 200
Isolation Barrier -0.1 to Vcci-0.3
OP3 Input Offset Voltage (mV) 0.01
OP3 GBWP (kHz) 2200
LDO Supply Voltage (V) 4.0 to 36
LDO Output Voltage (V) 3.0 to 5.5
LDO Output Current (mA) 0 to 4
Oper. Temp. (°C) -55 to +125-40 to +85
Package/Pins TQFN HYBRID/32
Footprint (mm x mm) 5 x 5
BudgetaryPrice (See Notes) 3.22


MAX12900AATJ+ Special Function by Analog Devices

ANALOG FRONT-END SENSOR TX 16BIT TQFN

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

IC Function Analog Front End
Supply Voltage Min 4V
Supply Voltage Max 36V
IC Package Type TQFN
No. of Pins 32Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

4-20mA Analog Backend | Analog Devices
ANALOG FRONT-END, SENSOR TX, 16BIT, TQFN | Farnell
4Ma-20Ma Sensor Transmitter, Tqfn-32 | Newark Electronics

Frequently Asked Questions

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Is the MAX12900AATJ+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, Farnell and Newark Electronics have stock available or on a lead time for MAX12900AATJ+ .

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