1 MSPS, Ultralow Power, 12-Bit ADC in 10-Lead LFCSP and MSOP

The AD7091R is a 12-bit successive approximation analog-to-digital converter (ADC) that offers ultralow power consumption (typically 349 µA at 3 V and 1 MSPS) while achieving fast throughput rates (1 MSPS with a 50 MHz SCLK). Operating from a single 2.7 V to 5.25 V power supply, the part contains a wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 7 MHz. The AD7091R also features an on-chip conversion clock, accurate reference, and high speed serial interface.

The conversion process and data acquisition are controlled using a CONVST signal and an internal oscillator. The AD7091R has a serial interface that allows data to be read after the conversion while achieving a 1 MSPS throughput rate.

The AD7091R uses advanced design and process techniques to achieve very low power dissipation at high throughput rates. An on-chip, accurate 2.5 V reference is available

Product Highlights

* Lowest Power 12-Bit SAR ADC Available.

* On-Chip, Accurate 2.5 V Reference.

* High Throughput Rate with Ultralow Power Consumption.

* Flexible Power/Throughput Rate Management.

Average power scales with the throughput rate. Power-down

mode allows the average power consumption to be reduced

when the device is not performing a conversion.

* Single Supply Operation with VDRIVE Function.

The AD7091R operates from a single 2.7 V to 5.25 V supply.

The VDRIVE function allows the serial interface to connect

directly to 1.8 V to 3.3 V processors.

Applications

* Battery-powered systems

– Handheld meters

– Medical instruments

– Mobile communications

* Instrumentation and control systems

* Data acquisition systems

* Optical sensors

* Diagnostic/monitoring functions

* Energy harvesting

* Fast throughput rate of 1 MSPS

* Specified for VDD of 2.7 V to 5.25 V

* Logic voltage VDRIVE of 1.65 V to 5.25 V

* INL of ±1 LSB maximum

* Analog input range of 0 V to VREF

* Ultralow power

* 349 µA typical at 3 V and 1 MSPS

* 264 nA typical at 3 V in power-down mode

* Internal 2.5 V reference, ±4.5 ppm/°C typical drift

* Wide input bandwidth

* Flexible power/throughput rate management

* High speed serial interface

* SPI®/QSPI™/MICROWIRE™/DSP compatible

* BUSY indicator

* Power-down mode

* 10-lead, 3 mm × 2 mm LFCSP and 10-lead MSOP packages

* Temperature range of −40°C to +125°C