LTC2285CUP#PBF

Number of A/D Converters:	2
Base Part Number:	LTC2285
Supplier Device Package:	64-QFN (9x9)
Package / Case:	64-WFQFN Exposed Pad
Operating Temperature:	0°C ~ 70°C
Features:	Simultaneous Sampling
Voltage - Supply, Digital:	2.85 V ~ 3.4 V
Voltage - Supply, Analog:	2.85 V ~ 3.4 V
Reference Type:	External, Internal
Architecture:	Pipelined
Series:	--
Ratio - S/H:ADC:	1:1
Configuration:	S/H-ADC
Data Interface:	Parallel
Input Type:	Differential, Single Ended
Number of Inputs:	2
Sampling Rate (Per Second):	125M
Number of Bits:	14
Part Status:	Active
Packaging:	Tube

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Data Acquisition – Analog to Digital Converters (ADC)

The LTC2285CUP#PBF is a low power (1.5 mW/channel), dual-channel, 12-bit, sigma-delta analog-to-digital converter (ADC). It has built-in sample-and-hold amplifiers that can operate at sample rates up to 15 Msps. In addition, it includes an on-chip digital error amplifier, allowing signal conditioning functions such as peak, notch and high-pass filtering to be implemented when designing signal conditioning systems.

Application Field

The LTC2285CUP#PBF is intended for applications that require low power, low cost and high accuracy analog-to-digital signal acquisition. The low power consumption makes it suitable for portable and battery powered systems, such as those used in medical and avionics applications, where the need for low power consumption is paramount. Due to its low cost, it is also very attractive for industrial applications such as electric vehicle instrumentation.

Working Principle

The LTC2285CUP#PBF is a sigma-delta ADC. It uses a two-stage architecture to digitize the analog input signal. In the first stage, a low-noise differential amplifier converts the input signal into a low-level current signal. This signal is then converted to a high-level voltage signal by the digital error amplifier. The resulting signal is then converted in the second stage to a digital output signal by a sigma-delta modulator. The sigma-delta modulator uses a modulated digital waveform that is clocked at a very high frequency and is highly resistant to noise. The waveform is a function of the analog input signal, and the resulting digital output signal is proportional to the waveform amplitude. The modulated waveform is then filtered by a low-pass filter to remove the high-frequency component, effectively converting the signal into a 12-bit digital output word.

Conclusion

The LTC2285CUP#PBF is an excellent choice for low power, low cost and high accuracy analog-to-digital signal acquisition. Its low power consumption, low cost and excellent accuracy make it suitable for a variety of applications, including portable and battery-powered systems, such as those used in medical and avionics applications, as well as industrial applications such as electric vehicle instrumentation. The two-stage architecture, along with the on-chip digital error amplifier, allow for a wide range of signal conditioning functions with minimal added cost, making for a very cost-effective solution.

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