High-resolution, low-power SAR ADC boosts T&M performance

November 07, 2016 // By Graham Prophet
Analog Devices has a new generation of high-precision successive-approximation (SAR) analogue-to-digital converters (ADCs) that combine the attributes of high performance, low power, small footprint, and ease of use. These ICs enable mobile test and measurement instruments to operate for longer duration during field tests while improving measurement accuracy and repeatability.

The new devices also support development of smaller-sized instruments, which can be placed closer to the sensors being measured, or allow for an increased number of data acquisition channels in the same form factor.

 

ADI cites the high performance and ease of use of the 2-Msample/sec, 18-bit AD4003 and 16-bit AD4000 SAR ADCs, that can simplify the design task, removing the need for making difficult and conflicting technical tradeoffs. Features such as high input-impedance mode and span-compression mode reduce the design challenge associated with the ADC driver stage and increase the flexibility of amplifier selection. A high input-impedance mode allows the use of low-power precision amplifiers to directly drive the ADC, and reduces the signal-chain power demands. Internal overvoltage protection removes the need for external protection devices, and span compression enables the ADC driver stage to operate from the same supply rail as the ADC, thus simplifying power management. This combination supports increased channel density while lowering the system-level power requirements, without compromising performance.

 

The AD400x series includes 20-, 18-, and 16-bit SAR ADCs with speed options from 500 ksamples/sec to 2 Msamples/sec.

 








Product

Resolution

Sampling Rate

Signal- Noise Ratio

Integral Non Linearity

Price (1,000)

Package Options

AD4003

18 Bits

2 MSPS

100.5 dB

±0.5 LSB

$19.85

10-pin 3 × 4.9 mm MSOP

10-pin 3 × 3 mm LFCSP

AD4000

16 Bits

2 MSPS

93 dB

±0.2 LSB

$12.75

10-pin 3 × 4.9 mm MSOP

10-pin 3 × 3 mm LFCSP

 

 

Anaog Devices; www.analog.com/AD4003 / www.analog.com/AD4000