Datasheet AD7091R (Analog Devices)

1 MSPS, Ultralow Power, 12-Bit ADC in 10-Lead LFCSP and MSOP Data Sheet AD7091R FEATURES FUNCTIONAL BLOCK DIAGRAM Fast throughput rate of 1 MSPS REGCAP REF V IN/REFOUT DD Specified for VDD of 2.7 V to 5.25 V Logic voltage V 2.5V AD7091R DRIVE of 1.65 V to 5.25 V REF INL of ±1 LSB maximum SDO Analog input range of 0 V to VREF 12-BIT SERIAL SCLK Ultralow power V T/H IN SAR INTERFACE CS 349 µA typical at 3 V and 1 MSPS VDRIVE 264 nA typical at 3 V in power-down mode CLK Internal 2.5 V reference, ±4.5 ppm/°C typical drift CONVERSION OSC Wide input bandwidth CONTROL LOGIC CONVST Flexible power/throughput rate management
001
High speed serial interface GND
10494-
SPI®/QSPI™/MICROWIRE™/DSP compatible
Figure 1.
BUSY indicator
The AD7091R uses advanced design and process techniques to
Power-down mode
achieve very low power dissipation at high throughput rates. An
10-lead, 3 mm × 2 mm LFCSP and 10-lead MSOP packages
on-chip, accurate 2.5 V reference is available.
Temperature range of −40°C to +125°C 1100 V APPLICATIONS V 1000 DD = V DD = V DR DRIIV V E = 3V E = 3V Battery-powered systems 900 Handheld meters 800 Medical instruments ) 700 W Mobile communications (μ 600 ER Instrumentation and control systems 500 W V Data acquisition systems PO DD 400 Optical sensors 300 Diagnostic/monitoring functions 200 Energy harvesting 100 VDRIVE GENERAL DESCRIPTION 0 0 200 400 600 800 1000
002 The AD7091R is a 12-bit successive approximation analog-to-
THROUGHPUT RATE (kSPS)
10494- digital converter (ADC) that offers ultralow power consumption Figure 2. Power vs. Throughput Rate (typically 349 µA at 3 V and 1 MSPS) while achieving fast
PRODUCT HIGHLIGHTS
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 1. Lowest Power 12-Bit SAR ADC Available. wide bandwidth track-and-hold amplifier that can handle input 2. On-Chip, Accurate 2.5 V Reference. frequencies in excess of 7 MHz. The AD7091R also features an 3. High Throughput Rate with Ultralow Power Consumption. on-chip conversion clock, accurate reference, and high speed 4. Flexible Power/Throughput Rate Management. serial interface. Average power scales with the throughput rate. Power-down mode al ows the average power consumption to be reduced The conversion process and data acquisition are controlled using when the device is not performing a conversion. a CONVST signal and an internal oscillator. The AD7091R has 5. Single Supply Operation with VDRIVE Function. a serial interface that al ows data to be read after the conversion The AD7091R operates from a single 2.7 V to 5.25 V supply. while achieving a 1 MSPS throughput rate. The VDRIVE function al ows the serial interface to connect directly to 1.8 V to 3.3 V processors.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION INTERNAL/EXTERNAL VOLTAGE REFERENCE TYPICAL CONNECTION DIAGRAM ANALOG INPUT MODES OF OPERATION Normal Mode Power-Down Mode POWER CONSUMPTION Normal Mode Normal and Power-Down Mode Combination SERIAL INTERFACE WITH BUSY INDICATOR WITHOUT BUSY INDICATOR SOFTWARE RESET INTERFACING WITH 8-/16-BIT SPI OUTLINE DIMENSIONS ORDERING GUIDE