AD7091 Datasheet, PDF (1/20 Pages) Analog Devices – 1 MSPS, Ultralow Power, 12-Bit ADC in 8-Lead LFCSP

Data Sheet
FEATURES
Fast throughput rate of 1 MSPS
Specified for VDD of 2.09 V to 5.25 V
INL of ±1 LSB maximum
Analog input range of 0 V to VDD
Ultralow power
367 μA typical at 3 V and 1 MSPS
324 nA typical at 3 V in power-down mode
Reference provided by VDD
Flexible power/throughput rate management
High speed serial interface: SPI®-/QSPI™-/MICROWIRE®-/
DSP-compatible
Busy indicator
Power-down mode
8-lead, 2 mm × 2 mm LFCSP package
Temperature range: −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 AD7091 is a 12-bit successive approximation register
analog-to-digital converter (SAR ADC) that offers ultralow
power consumption (typically 367 μA at 3 V and 1 MSPS) while
achieving fast throughput rates (1 MSPS with a 50 MHz SCLK).
The AD7091 operates from a single 2.09 V to 5.25 V power
supply. The AD7091 also features an on-chip conversion clock
and a high speed serial interface.
The conversion process and data acquisition are controlled using
a CONVST signal and an internal oscillator. The AD7091 has a
serial interface that allows data to be read after the conversion
while achieving a 1 MSPS throughput rate. The AD7091 uses
advanced design and process techniques to achieve very low
power dissipation at high throughput rates.
1 MSPS, Ultralow Power,
12-Bit ADC in 8-Lead LFCSP
AD7091
FUNCTIONAL BLOCK DIAGRAM
REGCAP
V_DD
AD7091
V_IN
T/H
12-BIT
SAR
ADC
SERIAL
INTERFACE
SDO
SCLK
CS
CONVERSION
CONTROL LOGIC
CLK
OSC
CONVST
GND
Figure 1.
1100
V_DD = 3V
1000
900
800
700
600
500
400
300
200
100
0
0
200
400
600
800
1000
THROUGHPUT RATE (kSPS)
Figure 2. Power Dissipation vs. Throughput Rate
The reference is derived internally from VDD. This design allows
the widest dynamic input range to the ADC; that is, the analog
input range for the AD7091 is from 0 V to VDD.
PRODUCT HIGHLIGHTS
1. Lowest Power 12-Bit SAR ADC Available.
2. High Throughput Rate with Ultralow Power Consumption.
3. 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.
4. Reference Derived from the Power Supply.
5. Single-Supply Operation.
Rev. A
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