LTC1665CGN#TRPBF

Reference Type:	External
Base Part Number:	LTC1665
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C
Architecture:	Oversampling Interpolating DAC
INL/DNL (LSB):	±0.2, ±0.1
Voltage - Supply, Digital:	2.7 V ~ 5.5 V
Voltage - Supply, Analog:	2.7 V ~ 5.5 V
Series:	--
Data Interface:	SPI
Differential Output:	No
Output Type:	Voltage - Unbuffered
Settling Time:	30µs (Typ)
Number of D/A Converters:	8
Number of Bits:	8
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction
This article is about the LTC1665CGN#TRPBF Application Field andWorking Principle. This type of device is a Digital to AnalogConverter (DAC) and is widely used in applications such asautomotive, industrial and instrumentation. This kind of DACcan convert digital input information, usually up to 16bitresolution, into an analog output voltage or current. It is a high-performance and high-precision device that can provide veryaccurate, low output noise, and fast settling characteristicsas required by many applications. The LTC1665CGN#TRPBF is aspecial variant of LTC1665 and it has very low powerconsumption and also supports split-supply operation which canbe optionally enabled.
Application Field
The LTC1665CGN#TRPBF was specially designed for applicationswhich require high performance, high precision, and low power-consumption. It is widely used in automotive electronics,industrial systems, instrumentation, and medical devices. It canalso be found in applications where precise control of analogoutputs such as control of motor speeds and positions, controlof digital-to-analog conversion systems, and control ofscanning and monitoring systems, is required. It can also beused for digital-to-analog conversion in audio applications,such as for producing pure tones for hearing testing and audiologic monitoring. Furthermore, it can be used for digital to analog conversion in data acquisition and avionics applications.
Working Principle
The working principle behind the LTC1665CGN#TRPBF is basedon a potentiometric principle. This type of device consists of aDigital to Analog components and associated circuits. Theresponse time of the device depends on the number of bits it isconfigured to receive, and on the resistance of the potentiometers. Depending on the type of DAC, it can also relies onanalog switches, linearization networks, or a resistor string toproduce the desired output. The input to the DAC is a digital data stream that isdecoded by an internal microprocessor to determine the outputvalue. The microprocessor then apply the data to the outputcircuit. The output can be a single ended unipolar voltage, asingle ended bipolar voltage, or a current sink. The digital datainput is typically between 8 and 16-bit in resolution. Dependingon the device type, certain features may also be available such astwo-channel operations, 12-bit to 20-bit resolution, and datasheet compliant operation.The device utilizes a low impedance circuit toproduce highly accurate outputs with fast settling. This lowimpedance circuit primarily consists of a transistor, resistors, and a capacitor that generate a bypass current during theoutput settling time. The bypass current decreases the settlingtime and increases the accuracy of the output by decreasingerror due to charge injection.The overall accuracy of the device is also determined by thequantity and quality of the data inputs and the internalprecision of the DAC. The accuracy of the output isimproved by utilizing multiplexing and high-quality parts. TheDAC also utilizes a typical resolution rate of 8 to 16-bits, withsome models having a resolution rate as high as 20 bits.The DAC also includes many features that improvestability and performance. These include soft-start, low-voltagelockout, power-down detection, temperature compensation,anti-aliasing, and digital noise cancellation. Furthermore, thedevice has temperature sensors to detect temperatures andinfrared sensors for temperature compensation and low-noiseperformance.Conclusion
In conclusion, the LTC1665CGN#TRPBF is a high-performance andhigh-precision Digital to Analog Converter (DAC) suitable fora variety of automotive, industrial, and instrumentationsystems. This type of device is capable of providing fastsettling, low output noise, and highly accurate outputs witha typical resolution rate of 8 to 16-bits. The various featuresincluded in the device provide temperature compensation,low-voltage lockout, and digital noise cancellation, therebyimproving the overall accuracy, stability, and performance ofthe LTC1665CGN#TRPBF.

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