1 MSPS, Ultralow Power,

12-Bit ADC in 8-Lead LFCSP

Data Sheet

AD7091

Rev. A

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FEATURES

Fast throughput rate of 1 MSPS

INL of ±1 LSB maximum

Ultralow power

367 μA typical at 3 V and 1 MSPS

324 nA typical at 3 V in power-down mode

Flexible power/throughput rate management

High speed serial interface: SPI®-/QSPI™-/MICROWIRE®-/

DSP-compatible

Busy indicator

Power-down mode

8-lead, 2 mm × 2 mm LFCSP package

Temperature range: −40°C to +125°C

APPLICATIONS

Battery-powered systems

Handheld meters

Medical instruments

Mobile communications

Instrumentation and control systems

Data acquisition systems

Optical sensors

Diagnostic/monitoring functions

Energy harvesting

FUNCTIONAL BLOCK DIAGRAM

CONVERSION

CONTROL LOGIC

GND

CLK

OSC

REGCAP

12-BIT

SAR

ADC

SERIAL

INTERFACE

SDO

AD7091

SCLK

CS

CONVST

T/H

Figure 1.

0

100

200

300

400

500

600

700

800

900

1000

1100

0

200

400

600

800

1000

THROUGHPUT RATE (kSPS)

Figure 2. Power Dissipation vs. Throughput Rate

GENERAL DESCRIPTION

The AD7091 is a 12-bit successive approximation register

analog-to-digital converter (SAR ADC) that offers ultralow

power consumption (typically 367 μA at 3 V and 1 MSPS) while

achieving fast throughput rates (1 MSPS with a 50 MHz SCLK).

The AD7091 operates from a single 2.09 V to 5.25 V power

supply. The AD7091 also features an on-chip conversion clock

and a high speed serial interface.

The conversion process and data acquisition are controlled using

a CONVST signal and an internal oscillator. The AD7091 has a

serial interface that allows data to be read after the conversion

while achieving a 1 MSPS throughput rate. The AD7091 uses

advanced design and process techniques to achieve very low

power dissipation at high throughput rates.

the widest dynamic input range to the ADC; that is, the analog

PRODUCT HIGHLIGHTS

1.

Lowest Power 12-Bit SAR ADC Available.

2.

High Throughput Rate with Ultralow Power Consumption.

3.

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.

4.

Reference Derived from the Power Supply.

5.

Single-Supply Operation.