Linear Technology Corporation introduces the LTC1408, a low-power 14-bit 600ksps analog-to-digital converter (ADC) with six simultaneous sampling differential inputs. This 3-wire serial ADC operates from a single 3V supply, with power dissipation typically 15mW. The LTC1408 is available in a 32-pin (5mm x 5mm) QFN package. With less than 1/10th the power consumption and 1/5th the package size of the nearest competitor, the LTC1408 allows the design of compact, battery-powered, and portable data acquisition systems. The six simultaneously sampled differential inputs make this device the ideal choice for multiphase power measurement, multiphase motor control, data acquisition systems, and uninterruptable power supplies.

When the LTC1408 is not converting, power dissipation can be further reduced to 3.3mW in Nap mode with the internal 2.5V reference remaining active, and to 6uW in Sleep mode, with all internal circuitry powered down. The internal reference can also be overdriven with an external reference, up to the analog supply voltage.

The LTC1408 uses three input-select lines to configure the number of differential inputs converted. Thus, higher speeds are possible, from one differential input at 600ksps to six differential inputs at 100ksps. The six conversion results are delivered sequentially to a high speed DSP serial port via a 3-wire interface. This ADC also features a separate digital output power supply pin and a bipolar/unipolar pin to select ±1.25V bipolar or 0V to 2.5V unipolar input ranges.

The LTC1408 is available in the commercial and industrial temperature ranges. Pricing begins at $8.95 in 1,000-piece quantities.

Summary of Features: LTC1408
 600ksps Sampling ADC with 6 Simultaneous Differential Inputs
 100ksps Throughput Per Channel
 Low Power Dissipation:
  - Active Mode (15mW)
  - NAP Shutdown Mode (3.3mW)
  - SLEEP Shutdown Mode (6uW) 
 3V Single Supply Operation
 76dB SINAD
 
 0V to 2.5V Unipolar/±1.25V Bipolar Differential Input Range
 
 2.5V Internal Reference, Can Be Overdriven with External Reference 
 3-Wire Serial Interface 
 83dB Common Mode Rejection Ratio at 100kHz 
 Tiny 32-Pin (5mm x 5mm) QFN Package