12-Bit ADC - Analog Devices
Description
Data Sheet
1 MSPS, Ultralow Power, 12-Bit ADC in 10-Lead LFCSP and MSOP
AD7091R
FEATURES
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
APPLICATIONS
Battery-powered systems Handheld meters Medical instruments Mobile communications
Instrumentation and control systems Data acquisition systems Optical sensors Diagnostic/monitoring functions Energy harvesting
GENERAL DESCRIPTION
The AD7091R is a 12-bit successive approximation analog-todigital 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.
FUNCTIONAL BLOCK DIAGRAM
REGCAP REFIN/REFOUT
VDD
2.
5V AD7091R
REF
VIN T/H
12-BIT SAR
SERIAL INTERFACE
CONVERSION CONTROL LOGIC
CLK OSC
SDO SCLK CS VDRIVE
CONVST
10494-001
GND
Figure 1.
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.
1100 1...
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