AD7837BN

Reference Type:	External
Base Part Number:	AD7837
Supplier Device Package:	24-PDIP
Package / Case:	24-DIP (0.300", 7.62mm)
Operating Temperature:	-40°C ~ 85°C
Architecture:	R-2R
INL/DNL (LSB):	±0.5 (Max), ±1 (Max)
Voltage - Supply, Digital:	--
Voltage - Supply, Analog:	±14.25 V ~ 15.75 V
Series:	--
Data Interface:	Parallel
Differential Output:	No
Output Type:	Voltage - Buffered
Settling Time:	5µs
Number of D/A Converters:	2
Number of Bits:	12
Part Status:	Obsolete
Packaging:	Tube

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Introduction

Data Acquisition - Digital to Analog Converters (DAC) is essential in various fields of engineering and technology-related research, especially if some kind of analog measurement is required. This article will focus on the application field and working principle of AD7837BN, a voltage output, rail-to-rail input, 10-bit DAC with 10-bit accuracy and no internal reference, and discuss the application of such DACs in data acquisition.

AD7837BN DAC Description

AD7837BN is an ultra-high linearity, fast settling 10-bit Digital-to-Analog Converter. It is an ideal solution for demanding applications which require excellent accuracy and speed. Powered from a single +5V supply, this DAC gives full scale output of 4.096V at a 10-bit resolution with a frequency range of 10Hz to 10MHz. The AD7837BN has a Rail-to-Rail input, meaning that the duty cycle is designed to reduce the voltage range by half. This makes the DAC suitable for use with low-voltage systems, as it is able to accommodate small voltage signals. The AD7837BN has an integrated charge pump that provides a negative power supply voltage, which allows for a maximum output voltage of -2.048V to +2.048V. This helps achieve improved linearity and settles down to an overall accuracy of 0.5LSB. The AD7837BN has a built-in pre-biased operational amplifier which can be used to increase the output voltage to twice the value of the logic input, allowing for a larger output dynamic range. Additionally, this DAC provides pop-and-click free power-up and power-down on the output stage. The DAC operates over a temperature range of -40°C to +105°C, with a maximum power dissipation of 1.2W.The AD7837BN has a typical power consumption of 6mW. This A/D DAC is available in a 16-pin PQFN package or a 16-pin HVQFN package.

Application Fields

The AD7837BN is well suited for a wide range of applications, such as industrial, automotive, medical and communications, making it an important tool for designing any application where precision and accuracy are required. In industrial applications, the AD7837BN can provide high accuracy for linear motor control, and can also be used for stepper motor control as well as temperature stabilization loops.In automotive applications, the AD7837BN can be used for motor speed control, fuel injection and regeneration braking.In communications, this DAC is ideal for signal stabilization in down-converters, in power control circuits, and in high-end communications systems.In the medical field, the AD7837BN can be used in various machinery such as In Vitro Diagnostics (IVD) machines, fetal health monitors, and cardiac monitoring equipment.

Working Principle

The AD7837BN is a voltage output digital-to-analog converter (DAC) which converts a digital signal into an analog one. The AD7837BN is a 10-bit DAC which provides 10-bit accuracy and a maximum linear output voltage of 4.096V. The data input is serial and is processed by an internal serial-to-parallel interface. The digital word is then processed by a 10-bit DAC. The internal voltage reference is used to convert the input digital code into a corresponding output voltage. The output voltage is formed by the combination of discrete input signals. The value of each signal is stored in the device’s internal registers. The output voltage is then buffered and amplified by an integrated operational amplifier. With the internal reference voltage set at 2.048V, the output voltage is available from -2.048V to +2.048V with a 10-bit accuracy of 0.5LSB. The output stage of the AD7837BN is internally regulated, making it suitable for single-supply operation.The power-up and power-down states are also pop-and-click free, making it suitable for applications which require high-speed settling. The AD7837BN is temperature compensated and specified over a temperature range of -40°C to +105°C.

Conclusion

The AD7837BN is a robust, precise and accurate digital-to-analog converter which provides a rail-to-rail input and 10-bit accuracy. The DAC is designed for low-voltage operation and can be used in a wide range of applications including industrial, automotive, medical and communications. With a built-in pre-biased operational amplifier and a pop-and-click free power up and power down, the AD7837BN is a great choice for precise and precise analog signal conversion.

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