14-Bit ADC Simultaneously Samples Six Differential Inputs

26th September 2007

ES Admin

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Linear Technology has introduced the LTC2351-14, a 1.5Msps low-power analog-to-digital converter with six simultaneous sampling differential inputs. Operating from a single 3.3V supply, power dissipation is typically 16.5mW. The LTC2351-14 features six individual sample-and-hold amplifiers, a multiplexer, and a single ADC making this device the ideal choice for multiphase power measurement, multiphase motor control, data acquisition systems, and uninterrupted power supplies.

Packaged in a 32-pin (5mm x 5mm) QFN, the LTC2351-14 allows the design of compact, battery-powered, and portable data acquisition systems.

When the LTC2351-14 is not converting, power dissipation can be further reduced to 4.5mW in Nap mode with the internal 2.5V reference remaining active, and to 12uW in Sleep mode, with all internal circuitry powered down. The internal 2.5V reference can be overdriven with an external reference, up to the analog supply voltage.

The LTC2351-14 uses three input-select lines to configure the number of differential inputs converted. Thus, higher speeds are possible, from one differential input at 1.5Msps to six differential inputs at 250ksps. 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 input line to select ±1.25V bipolar or 0V to 2.5V unipolar input ranges.

For lower resolution applications, Linear Technology is also introducing the pin and code-compatible 12-bit LTC2351-12 ADC. Both the LTC2351-14 and LTC2351-12 are available in the commercial and industrial temperature ranges. Pricing begins at $9.45 each for the LTC2351-14 and $6.95 each for the LTC2351-12, in 1,000-piece quantities.