Multichannel, 12-bit, 1-MSPS SAR A/D converters boost power efficiency

August 28, 2014 // By Graham Prophet
Analog Devices has added three ultra-low-power, multichannel, 12-bit, 1-Msample/sec SAR (successive approximation register) A/D converters. The new 2, 4 and 8-channel A/D converters are designed for battery-powered data acquisition modules, handheld meters, field instruments and communications applications as well as medical devices such as portable electrocardiograms and heart rate monitors.

The A/D converters are positioned as the most power-efficient in their class, dissipating a maximum of 1.7 mW at 1 Msamples/sec, which is over 60% less power than the closest SAR A/D converter competitor. The A/D converters are housed in a 4 × 4-mm LFCSP package and feature a 5 ppm/°C typ on-chip internal reference. The 1 Msample/sec throughput is available with flexible power/throughput rate management. Power consumption at 3V supply is 1.7 mW @ 1 Msample/sec, 900 µW @ 500 ksample/sec and 1.4 µW @ powerdown. A programmable channel sequencer with access to the multiplexer output eliminates the need for one buffer per channel saving both power and space. A user programmable alert can signal an out-of-bounds condition without requiring the user to service the A/D converter output data (minimises processor overhead/power). The part ahs an SPI interface and operates over –40°C to +125°C.

A video is here; http://videos.analog.com/video/products/analog-to-digital-converters/3232171672001/Industrys-Lowest-Power-Multichannel-12-bit-ADCs/

Product

Channels

Availability

Price Each per1,000

Packaging

AD7091R-2

2

NOW

$2.47

16-lead TSSOP

or

4-mm × 4-mm

LFCSP

AD7091R-4

4

NOW

$2.67

20-lead TSSOP

or

4-mm × 4-mm

LFCSP

AD7091R-8

8

NOW

$3.36

24-lead TSSOP

or

4-mm × 4-mm

LFCSP