ADA4806-1_16 Datasheet, PDF (1/25 Pages) Analog Devices – 0.2 μV/°C Offset Drift, 105 MHz, Low Power, Multimode, Rail-to-Rail Amplifier

Data Sheet
0.2 µV/°C Offset Drift, 105 MHz, Low Power,
Multimode, Rail-to-Rail Amplifier
ADA4806-1
FEATURES
Ultralow supply current
Full power mode: 500 µA
Sleep mode: 74 µA
Shutdown mode: 2.9 µA
Dynamic power scaling
Turn-on time from shutdown mode: 1.5 µs
Turn-on time from sleep mode: 0.45 µs
High speed performance with dc precision
Input offset voltage: 125 µV maximum
Input offset voltage drift: 1.5 µV/°C maximum
−3 dB bandwidth: 105 MHz
Slew rate: 160 V/ µs
Low noise and distortion
5.9 nV/√Hz input voltage noise with 8 Hz 1/f corner
−102 dBc/−126 dBc HD2/HD3 at 100 kHz
Wide supply range: 2.7 V to 10 V
Small package: 8-lead SOT-23
APPLICATIONS
Portable and battery-powered instruments and systems
High channel density data acquisition systems
Precision analog-to-digital converter (ADC) drivers
Voltage reference buffers
Portable point of sales terminals
Active RFID readers
GENERAL DESCRIPTION
The ADA4806-1 is a high speed, voltage feedback, rail-to-rail
output, single operational amplifier with three power modes:
full power mode, sleep mode, and shutdown mode. In full
power mode, this amplifier provides a wide bandwidth of 105 MHz
at a gain of +1, a fast slew rate 160 V/μs, and excellent dc precision
with a low input offset voltage of 125 μV (maximum) and an input
offset voltage drift of 1.5 μV/°C (maximum), while con-suming
only 500 μA of quiescent current. Despite being a low power
amplifier, the ADA4806-1 provides excellent overall
performance, making it ideal for low power, high resolution
data conversion systems.
For data conversion applications where minimizing power
dissipation is paramount, the ADA4806-1 offers a method to
reduce power by dynamically scaling the quiescent power of the
ADC driver with the sampling rate of the system by switching the
amplifier to a lower power mode between samples.
TYPICAL APPLICATIONS CIRCUIT
5V
2.5V REF
ADA4806-1
C2
10µF
C3
0.1µF
VDD
C4
100nF
0V TO V_REF
5V
ADA4806-1
R3
20Ω
C1
2.7nF
REF VDD
IN+
AD7980
IN–
GND
Figure 1. Driving the AD7980 with the ADA4806-1
Sleep mode reduces the amplifier quiescent current to 74 µA
and provides a fast turn-on time of only 0.45 µs, enabling the
use of dynamic power scaling for sample rates approaching
2 MSPS. For additional power savings at lower samples rates,
the shutdown mode further reduces the quiescent current to
only 2.9 µA.
The ADA4806-1 operates over a wide range of supply voltages
and is fully specified at supplies of 3 V, 5 V and ±5 V. This
amplifier is available in a compact, 8-lead SOT-23 package and
is rated to operate over the industrial temperature range of
−40°C to +125°C.
3.5
3.0
2.5
2.0
SHUTDOWN MODE
1.5
1.0
SLEEP MODE
0.5
0
1
10
100
1000
ADC SAMPLE RATE (ksps)
Figure 2. Quiescent Power Dissipation vs. ADC Sample Rate,
Using Dynamic Power Scaling for the Two Low Power Modes
Table 1. Complementary ADCs to the ADA4806-1
Throughput Resolution
Product ADC Power (mW) (MSPS)
(Bits)
AD7980 4.0
1
16
AD7982 7.0
1
18
AD7984 10.5
1.33
18
1 _{This SNR value is for the A Grade version of the AD7980.}
SNR
(dB)
90.5¹
98
98.5
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com