EVAL-AD7091RSDZ 데이터 시트보기 (PDF) - Analog Devices
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EVAL-AD7091RSDZ Datasheet PDF : 20 Pages
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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-to-
digital 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
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
1000
VVDDDD == VVDDRRIVIVEE ==33VV
900
800
700
600
500
VDD
400
300
200
100
0
0
VDRIVE
200
400
600
800
THROUGHPUT RATE (kSPS)
1000
Figure 2. Power vs. Throughput Rate
PRODUCT HIGHLIGHTS
1. Lowest Power 12-Bit SAR ADC Available.
2. On-Chip, Accurate 2.5 V Reference.
3. High Throughput Rate with Ultralow Power Consumption.
4. 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.
5. Single Supply Operation with VDRIVE Function.
The AD7091R operates from a single 2.7 V to 5.25 V supply.
The VDRIVE function allows the serial interface to connect
directly to 1.8 V to 3.3 V processors.
Rev. B
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