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Analog Devices - 12-Bit SAR ADC

Numéro de référence AD7091R-4
Description 12-Bit SAR ADC
Fabricant Analog Devices 
Logo Analog Devices 





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AD7091R-4 fiche technique
Data Sheet
2-/4-/8-Channel, 1 MSPS,
Ultralow Power, 12-Bit SAR ADC
AD7091R-2/AD7091R-4/AD7091R-8
FEATURES
Ultralow system power
Flexible power/throughput rate management
Normal mode
1.4 mW at 1 MSPS
Power-down mode
550 nA typical at VDD = 5.25 V
435 nA typical at VDD = 3 V
Programmable ALERT interrupt pin (4-/8-channel models)
High performance
1 MSPS throughput with no latency/pipeline delay
SNR: 70 dB typical at 10 kHz input frequency
THD: −80 dB typical at 10 kHz input frequency
INL: ±0.7 LSB typical, ±1.0 LSB maximum
Small system footprint
On-chip accurate 2.5 V reference, 5 ppm/°C typical drift
MUXOUT/ADCIN to allow single buffer amplifier
Daisy-chain mode
16-lead, 20-lead, and 24-lead 4 mm × 4 mm LFCSP packages
16-lead, 20-lead, and 24-lead TSSOP packages
Easy to use
SPI/QSPI™/MICROWIRE™/DSP compatible digital interface
Integrated programmable channel sequencer
BUSY indication available (4-/8-channel models)
Built in features for control and monitoring applications
GPOx pins available (4-/8-channel models)
Wide operating range
Temperature range: −40°C to +125°C
Specified for VDD of 2.7 V to 5.25 V
APPLICATIONS
Battery-powered systems
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Data acquisition systems
Optical sensors
Diagnostic/monitoring functions
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
MUXOUT ADCIN VDD
REFIN/
REFOUT
REGCAP
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
I/P
MUX
CHANNEL
SEQUENCER
2.5V
VREF
T/H
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
ON-CHIP
OSC
CONTROL LOGIC
AND REGISTERS
AD7091R-8
VDRIVE
RESET
CONVST
SDO
SDI
SCLK
CS
GND
Figure 1.
ALERT/
BUSY/
GPO0
GPO1
GND
GENERAL DESCRIPTION
The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel
12-bit, ultralow power, successive approximation analog-to-
digital converter (ADC) that is available in two, four, or eight
analog input channel options. The AD7091R-2/AD7091R-4/
AD7091R-8 operate from a single 2.7 V to 5.25 V power supply
and are capable of achieving a sampling rate of 1 MSPS.
The AD7091R-2/AD7091R-4/AD7091R-8 family offers up to eight
single-ended analog input channels with a channel sequencer
that allows a preprogrammed selection of channels to be converted
sequentially. The AD7091R-2/AD7091R-4/ AD7091R-8 also
feature an on-chip conversion clock, an on-chip accurate 2.5 V
reference, and a high speed serial interface.
The AD7091R-2/AD7091R-4/AD7091R-8 have a serial port
interface (SPI) that allows data to be read after the conversion
while achieving a 1 MSPS throughput rate. The conversion process
and data acquisition are controlled using the CONVST pin.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2013–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

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