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ADA4805-2ARMZ Datasheet(PDF) 1 Page - Analog Devices

Part # ADA4805-2ARMZ
Description  0.2 關V/째C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifiers
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Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADA4805-2ARMZ Datasheet(HTML) 1 Page - Analog Devices

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0.2 µV/°C Offset Drift, 105 MHz Low Power,
Low Noise, Rail-to-Rail Amplifiers
Data Sheet
ADA4805-1/ADA4805-2
FEATURES
Low input offset voltage: 125 µV (maximum)
Low input offset voltage drift
0.2 µV/°C (typical)
1.5 µV/°C (maximum)
Ultralow supply current: 500 µA per amplifier
Fully specified at VS = 3 V, 5 V, ±5 V
High speed performance
−3 dB bandwidth: 105 MHz
Slew rate: 160 V/µs
Settling time to 0.1%: 35 ns
Rail-to-rail outputs
Input common-mode range: −VS − 0.1 V to +VS − 1 V
Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz
Low distortion: −102 dBc/−126 dBc HD2/HD3 at 100 kHz
Low input bias current: 470 nA (typical)
Dynamic power scaling
Turn-on time: 3 µs (maximum) fully settled
Small packaging
6-lead SC70, 6-lead SOT-23, and 8-lead MSOP
APPLICATIONS
High resolution, high precision analog-to-digital converter
(ADC) drivers
Battery-powered instrumentation
Micropower active filters
Portable point of sales terminals
Active RFID readers
Photo multipliers
ADC reference buffers
GENERAL DESCRIPTION
The ADA4805-1/ADA4805-2 are high speed voltage feedback,
rail-to-rail output amplifiers with an exceptionally low
quiescent current of 500 µA, making them ideal for low power,
high resolution data conversion systems. Despite being low
power, these amplifiers provide excellent overall performance.
They offer a high bandwidth of 105 MHz at a gain of +1, a high
slew rate of 160 V/µs, and a low input offset voltage of 125 µV
(maximum).
A shutdown pin allows further reduction of the quiescent
supply current to 2.9 µA. For power sensitive applications, the
shutdown mode offers a very fast turn-on time of 3 µs. This
allows the user to dynamically manage the power of the
amplifier by turning the amplifier off between ADC samples.
TYPICAL APPLICATIONS CIRCUIT
AD7980
C2
10µF
IN+
IN–
GND
VDD
REF
C3
0.1µF
C4
100nF
VDD
C1
2.7nF
R3
20Ω
+7.5V
+7.5V
ADA4805-1/
ADA4805-2
ADA4805-1/
ADA4805-2
ADR435
5V REF
0V TO
VREF
Figure 1. Driving the AD7980 with the ADA4805-1/ADA4805-2
The Analog Devices, Inc., proprietary extra fast complementary
bipolar (XFCB) process allows both low voltage and low current
noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1/ADA4805-2
operate over a wide range of supply voltages from ±1.5 V to
±5 V, as well as single 3 V and 5 V supplies, making them ideal
for high speed, low power instruments.
The ADA4805-1 is available in a 6-lead SOT-23 and a 6-lead
SC70 package. The ADA4805-2 is available in an 8-lead MSOP
and a 10-lead LFCSP package. These amplifiers are rated to
work over the industrial temperature range of −40°C to +125°C.
0
80
20
40
60
70
50
30
10
FREQUENCY (kHz)
–20
0
–40
–60
–80
–100
–120
–140
–160
–180
INPUT FREQUENCY = 10kHz
SNR = 89.4dB
THD = 104dB
SINAD = 89.3dB
Figure 2. FFT Plot for the Circuit Configuration in Figure 1
Table 1. Complementary ADCs to the ADA4805-1/ADA4805-2
Product
ADC Power (mW)
Throughput
(MSPS)
Resolution
(Bits)
SNR
(dB)
AD7982
7.0
1
18
98
AD7984
10.5
1.33
18
98.5
AD7980
4.0
1
16
91
AD7685
10
0.25
16
88
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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