Datasheet AD7091R-2, AD7091R-4, AD7091R-8 (Analog Devices)

2-/4-/8-Channel, 1 MSPS, Ultralow Power, 12-Bit SAR ADC Data Sheet AD7091R-2 /AD7091R-4 /AD7091R-8 FEATURES FUNCTIONAL BLOCK DIAGRAM Ultralow system power REFIN/ V REFOUT MUX REGCAP OUT ADCIN DD Flexible power/throughput rate management Normal mode 2.5V 1.4 mW at 1 MSPS VIN0 VREF 12-BIT SUCCESSIVE Power-down mode VIN1 T/H APPROXIMATION ADC 550 nA typical at V VIN2 DD = 5.25 V VDRIVE V 435 nA typical at V IN3 DD = 3 V I/P V MUX Programmable ALERT interrupt pin (4-/8-channel models) IN4 RESET VIN5 High performance CONVST ON-CHIP VIN6 OSC 1 MSPS throughput with no latency/pipeline delay SDO VIN7 CONTROL LOGIC SDI SNR: 70 dB typical at 10 kHz input frequency AND REGISTERS SCLK THD: −80 dB typical at 10 kHz input frequency CS CHANNEL INL: ±0.7 LSB typical, ±1.0 LSB maximum SEQUENCER Small system footprint AD7091R-8 On-chip accurate 2.5 V reference, 5 ppm/°C typical drift MUXOUT/ADCIN to allow single buffer amplifier GND ALERT/ GPO GND 1 BUSY/
001
Daisy-chain mode GPO0
10891-
16-lead, 20-lead, and 24-lead 4 mm × 4 mm LFCSP packages
Figure 1.
16-lead, 20-lead, and 24-lead TSSOP packages GENERAL DESCRIPTION Easy to use SPI/QSPI™/MICROWIRE™/DSP compatible digital interface
The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel
Integrated programmable channel sequencer
12-bit, ultralow power, successive approximation analog-to-
BUSY indication available (4-/8-channel models)
digital converter (ADC) that is available in two, four, or eight
Built in features for control and monitoring applications
analog input channel options. The AD7091R-2/AD7091R-4/
GPOx pins available (4-/8-channel models)
AD7091R-8 operate from a single 2.7 V to 5.25 V power supply
Wide operating range
and are capable of achieving a sampling rate of 1 MSPS.
Temperature range: −40°C to +125°C
The AD7091R-2/AD7091R-4/AD7091R-8 family offers up to eight
Specified for VDD of 2.7 V to 5.25 V
single-ended analog input channels with a channel sequencer
APPLICATIONS
that al ows a preprogrammed selection of channels to be converted sequentially. The AD7091R-2/AD7091R-4/ AD7091R-8 also
Battery-powered systems
feature an on-chip conversion clock, an on-chip accurate 2.5 V
Personal digital assistants
reference, and a high speed serial interface.
Medical instruments Mobile communications
The AD7091R-2/AD7091R-4/AD7091R-8 have a serial port
Instrumentation and control systems
interface (SPI) that allows data to be read after the conversion
Data acquisition systems
while achieving a 1 MSPS throughput rate. The conversion process
Optical sensors
and data acquisition are controlled using the CONVST pin.
Diagnostic/monitoring functions
The AD7091R-2/AD7091R-4/AD7091R-8 use advanced design techniques to achieve ultralow power dissipation at high throughput rates. They also feature flexible power management options. An on-chip configuration register allows the user to set up different operating conditions. These include power management, alert functionality, busy indication, channel sequencing, and general-purpose output pins. The MUXOUT and ADCIN pins allow signal conditioning of the multiplexer output prior to acquisition by the ADC.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS Timing Diagram ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION REFERENCE POWER SUPPLY DEVICE RESET TYPICAL CONNECTION DIAGRAM ANALOG INPUT DRIVER AMPLIFIER CHOICE REGISTERS ADDRESSING REGISTERS CONVERSION RESULT REGISTER CHANNEL REGISTER CONFIGURATION REGISTER ALERT INDICATION REGISTER CHANNEL x LOW LIMIT REGISTER CHANNEL x HIGH LIMIT REGISTER CHANNEL x HYSTERESIS REGISTER SERIAL PORT INTERFACE READING CONVERSION RESULT WRITING DATA TO THE REGISTERS READING DATA FROM THE REGISTERS POWER-ON DEVICE INITIALIZATION MODES OF OPERATION NORMAL MODE POWER-DOWN MODE ALERT (AD7091R-4 AND AD7091R-8 ONLY) BUSY (AD7091R-4 AND AD7091R-8 ONLY) CHANNEL SEQUENCER DAISY CHAIN OUTLINE DIMENSIONS ORDERING GUIDE