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PDF ADA4805-2-EP Data sheet ( Hoja de datos )
| Número de pieza | ADA4805-2-EP | |
| Descripción | Rail-to-Rail Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Enhanced Product
0.4 µV/°C Offset Drift, 105 MHz Low Power,
Low Noise, Rail-to-Rail Amplifier
ADA4805-2-EP
FEATURES
Low input offset voltage: 125 µV (maximum)
Low input offset voltage drift
0.4 µV/°C (typical)
2.7 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)
Small packaging
8-lead MSOP
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended industrial temperature range (−55°C to +125°C)
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Enhanced product change notification
Qualification data available upon request
APPLICATIONS
High resolution, high precision analog-to-digital converter
(ADC) drivers
Battery-powered instrumentation
Micropower active filters
Portable point of sales terminals
Active radio frequency identification (RFID) readers
Photomultipliers
ADC reference buffers
GENERAL DESCRIPTION
The ADA4805-2-EP is a high speed voltage feedback, rail-to-rail
output amplifier with an exceptionally low quiescent current of
500 µA, making it ideal for low power, high resolution data
conversion systems. Despite being low power, this amplifier
provides excellent overall performance. It offers 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).
TYPICAL APPLICATIONS CIRCUIT
5V REF
ADR435
+7.5V
ADA4805-2-EP
C2 C3
10µF 0.1µF
C4
100nF
VDD
0V TO
VREF
+7.5V
ADA4805-2-EP
R3
20Ω
C1
2.7nF
REF VDD
IN+
AD7980
IN–
GND
Figure 1. Driving the AD7980 with the ADA4805-2-EP
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 ADA4805-2-EP operates
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 it ideal for high speed, low
power instruments.
The ADA4805-2-EP is available in an 8-lead MSOP package and is
rated to work over the extended industrial temperature range of
−55°C to +125°C. Additional application and technical infor-
mation can be found in the ADA4805-1/ADA4805-2 data sheet.
0
INPUT FREQUENCY = 10kHz
–20
SNR = 89.4dB
THD = 104dB
SINAD = 89.3dB
–40
–60
–80
–100
–120
–140
–160
–180
0
10 20 30 40 50 60 70 80
FREQUENCY (kHz)
Figure 2. FFT Plot for the Circuit Configuration in Figure 1
Table 1. Complementary ADCs to the ADA4805-2-EP
Throughput Resolution
Product ADC Power (mW) (MSPS)
(Bits)
AD7982 7.0
1 18
AD7984 10.5
1.33 18
AD7980 4.0
1 16
AD7685 10
0.25 16
SNR
(dB)
98
98.5
91
88
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Enhanced Product
ADA4805-2-EP
3 V SUPPLY
VS = 3 V at TA = 25°C; RF = 0 Ω for G = +1; otherwise, RF = 1 kΩ; RL = 2 kΩ to midsupply; unless otherwise noted. All specifications are
per amplifier.
Table 4.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion, HD2/HD31
Input Voltage Noise
Input Voltage Noise 1/f Corner
0.1 Hz to 10 Hz Voltage Noise
Input Current Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift2
Input Bias Current
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Common Mode
Differential Mode
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
(Rising/Falling Edge)
Output Voltage Swing
Short-Circuit Current
Linear Output Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Power Supply Rejection Ratio
Positive
Negative
Test Conditions/Comments
G = +1, VOUT = 0.02 V p-p
G = +1, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V
G = +1, VOUT = 0.02 V p-p
G = +1, VOUT = 1 V step, +VS = 2 V, −VS = −1 V
G = +1, VOUT = 1 V step
fC = 20 kHz, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V
fC = 100 kHz, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V
f = 100 kHz
f = 100 kHz
TMIN to TMAX
VOUT = 1.1 V to 1.9 V
Min Typ
Max Unit
95 MHz
30 MHz
35 MHz
85 V/µs
41 ns
−123/−143
−107/−133
6.3
8
55
0.8
dBc
dBc
nV/√Hz
Hz
nV rms
pA/√Hz
7
0.4
440
0.5
100 107
125 µV
2.7 µV/°C
690 nA
nA
dB
VIN, CM = 0.5 V to 2 V
VIN = −1 V to +4 V, G = +2
RL = 2 kΩ
Sinking/sourcing
<1% THD at 100 kHz, VOUT = 1 V p-p
30% overshoot
+VS = 1.5 V to 3.5 V, −VS = −1.5 V
+VS = 1.5 V, −VS = −1.5 V to −3.5 V
50
260
1
−0.1
89 117
135/175
0.02
65/47
±40
15
2.7
470
96 119
96 125
MΩ
kΩ
pF
+2 V
dB
ns
2.98 V
mA
mA
pF
10 V
495 µA
dB
dB
1 fC is the fundamental frequency.
2 Guaranteed, but not tested.
Rev. 0 | Page 5 of 9
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