Review:

Linear introduced a 16 bit 5msps successive approximation register (SAR) type analog-to-digital converter (ADC) ltc2311-16 with wide rail to rail input common mode range. Ltc2311-16 provides flexible differential input and can accept analog signals up to Nyquist frequency. This can achieve direct conversion of multiple signal types, maintain a good 81.6db signal-to-noise ratio (SNR) at 2.2MHz input signal, and achieve a high common mode rejection ratio (CMRR) of 85dB at the same high-speed input signal.

Instrumentation and medical applications that require channel to channel isolation often use single channel ADCs to isolate front-end circuits separately. Each ADC channel needs its own signal conditioning circuit and isolated power supply. This circuit is copied to all channels, so any simplification of the circuit will have a far-reaching impact on the complexity of the system. The flexible differential input and wide input common mode range of ltc2311-16 can simplify the input signal conditioning design, so as to significantly reduce the number of components required, reduce the system cost and power consumption, and reduce the required circuit board space.

Ltc2311-16 leads a pin compatible 16 bit, 14 bit and 12 bit SAR ADC series with sampling rates of 5msps and 2msps. These devices integrate a precise internal reference with low drift to ensure a maximum temperature coefficient of 20ppm / ° C, thus simplifying the system design. This series can be powered by 3.3V or 5V power supply. It consumes 30MW when using 3.3V power supply and 50MW when using 5V power supply. High speed, SPI compatible CMOS or LVDS serial interface is very suitable for high-speed systems with high integration.

The ltc2311-16 is available in commercial, industrial and automotive (– 40 ° C to 125 ° C) temperature class versions. Other devices in this series will be launched in 2016. The wholesale price of 1000 tablets is $9.95 per tablet. Samples and demonstration circuit boards can be inquired for details through or contact linglilte local office.

Photo Description: 16 bit 5msps SAR ADC with wide input common mode range

Performance summary: ltc2311-16

·5msps (ltc2311) or 2msps (ltc2310) sampling rate

·8vp-p differential input with wide input common mode range

·With 81.6db SNR and – 90dB thd (16 bits) at fin = 2.2MHz

·± 3lsb inl (typ.), ± 8lsb inl (max.)

·Low drift (20ppm / ° C max), 2.048v or 4.096V internal reference

·Single 3.3V or 5V power supply

·No cycle delay (ltc2310)

·Low power consumption 30MW (3.3V) or 50MW (5V)

·CMOS or LVDS SPI compatible serial I / O

·It is guaranteed to operate in the temperature range of – 40 ° C to 125 ° C

·Small 16 lead 4mm x 5mm MSOP package

Responsible editor: GT

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