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12-bit, 1-/2-channel I²C SAR A/D converters guaranteed up to +125°C

Milpitas, Calif.—Linear Technology Corp. has introduced the LTC2301/LTC2305, a pair of 1-/2-channel 12-bit A/D converters that communicate via an I²C-compatible 2-wire interface and dissipate just 1.5mW at a 1ksps output rate.

Offered in pin-compatible 4mm x 3mm DFN and MSOP packages, the LTC2301 measures a single differential input while the LTC2305 digitizes two single-ended inputs. Both A/D converters offer guaranteed specifications over the automotive/H-grade temperature range of -40°C to +125°C in the MSOP package.

The LTC2301/LTC2305 are intended for automotive sensing, power and temperature measurements, as well as space-constrained designs that require I²C communication.

These A/D converters join the previously released 8-channel LTC2309, offering a complete family of software-compatible 1-/2-/8-channel 12-bit I²C successive approximation register (SAR) A/D converters that operate from a single 5V supply. All three devices offer an internal reference and a low-power shutdown mode that reduces power dissipation to 35µW.

The LTC2301/LTC2305 achieve high DC specifications, including ±1LSB INL and DNL, ±2mV(max) zero-scale error and ±1LSB(max) full-scale error. The LTC2301/LTC2305 also excel when digitizing AC input signals, achieving 73dB SINAD and -88dB THD at 1kHz.

The LTC2301/LTC2305 are capable of I²C data transfers up to 400kHz, allowing for throughput rates up to 14ksps. Data can be transferred via 3V or 5V logic. These A/D converters include two address select pins that can be tied low, high or left floating, allowing selection of any of nine unique I²C addresses. This is intended for applications that require measurement of multiple channels, as designers can easily communicate with more than one LTC2301/LTC2305 A/D converter in parallel.

The LTC2301 and LTC2305 are available today in commercial, industrial and automotive temperature grades.

Pricing: Begins at $1.95 for 1,000-piece quantities.
Availability: Today.
Datasheet: Click here.

Linear Technology, www.linear.com

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