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PDF ADA4805-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4805-1 | |
| Descripción | Rail-to-Rail Amplifiers | |
| Fabricantes | Analog Devices | |
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Data Sheet
0.2 µV/°C Offset Drift, 105 MHz Low Power,
Low Noise, Rail-to-Rail Amplifiers
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
5V REF
ADR435
+7.5V
ADA4805-1/
ADA4805-2
C2
10µF
C3
0.1µF
C4
100nF
VDD
0V TO
VREF
+7.5V
ADA4805-1/
ADA4805-2
R3
20Ω
C1
2.7nF
REF VDD
IN+
AD7980
IN–
GND
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
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 ADA4805-1/ADA4805-2
Throughput Resolution SNR
Product ADC Power (mW) (MSPS)
(Bits)
(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
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
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
ADA4805-1/ADA4805-2
Parameter
SHUTDOWN PIN
SHUTDOWN Voltage
Low
High
SHUTDOWN Current
Low
High
Turn-Off Time
Turn-On Time
OUTPUT CHARACTERISTICS
Overdrive Recovery Time (Rising/Falling
Edge)
Output Voltage Swing
Short-Circuit Current
Linear Output Current
Off Isolation
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Power Supply Rejection Ratio
Positive
Negative
1 fC is the fundamental frequency.
2 Guaranteed, but not tested.
Test Conditions/Comments
Powered down
Enabled
Powered down
Enabled
50% of SHUTDOWN to <10% of enabled
quiescent current
50% of SHUTDOWN to >90% of final VOUT
VIN = −1 V to +6 V, G = +2
RL = 2 kΩ
Sinking/sourcing
<1% THD at 100 kHz, VOUT = 2 V p-p
VIN = 0.5 V p-p, f = 1 MHz, SHUTDOWN = −VS
30% overshoot
Enabled
SHUTDOWN = −VS
+VS = 1.5 V to 3.5 V, −VS = −2.5 V
+VS = 2.5 V, −VS = −1.5 V to −3.5 V
Min Typ
Max Unit
<1.5
>1.9
−1.0 0.1
0.01
0.9
3
130/145
0.02
73/63
±47
41
15
2.7
500
2.9
100 120
100 126
V
V
µA
1.0 µA
1.25 µs
4 µs
ns
4.98 V
mA
mA
dB
pF
10 V
520 µA
4 µA
dB
dB
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
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
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
Rev. B | Page 5 of 25
5 Page 
Data Sheet
12
9 VGVSIN===+±1220.m5VV p-p
RL = 2kΩ
6
3
0
–3
–6
–9
–12
1
CCCCCLLLLL
=
=
=
=
=
15pF
10pF
5pF
0pF
15pF,
RS
=
226Ω
10
100
FREQUENCY (MHz)
Figure 14. Small Signal Frequency Response for Various Capacitive Loads
(See Figure 46)
–50
VS = ±5V, VOUT = 4V p-p
–60
–70 HD2, G = +1
–80
HD2, G = +2
–90
–100
–110
–120
–130
HD3, G = +2
–140
–150
–160
1
HD3, G = +1
10 100
FREQUENCY (kHz)
1000
Figure 15. Distortion vs. Frequency for Various Gains
–40
–50
VVSIN,=C±M2.=5V0V
G = +1
–60 RL = 2kΩ
INPUT COMMON-MODE
VOLTAGE UPPER LIMIT
(+VS – 1V)
–70 VIN = 1MHz
–80
–90
–100
–110
VIN = 100kHz
–120
–130
VIN = 10kHz
–140
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
OUTPUT VOLTAGE (V peak)
Figure 16. Total Harmonic Distortion vs. Output Voltage For Various
Frequencies
ADA4805-1/ADA4805-2
0.6
0.5 VGS==+±12.5V
0.4 RVOL U=T2=kΩ20mV p-p
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
1
10
FREQUENCY (MHz)
Figure 17. Small Signal 0.1 dB Bandwidth
100
–50
VS = ±5V, VOUT = 2V p-p
–60 VS = ±2.5V, VOUT = 2V p-p
VS = +2V/–1V, VOUT = 1V p-p
–70
–80
HD2 VS = ±5V
–90
–100
–110
HD2 VS = +2V/–1V
–120 HD2 VS = ±2.5V
–130
HD3 VS = +2V/–1V
–140
–150
–160
1
HD3 VS = ±2.5V
HD3 VS = ±5V
10 100
1000
FREQUENCY (kHz)
Figure 18. Distortion vs. Frequency for Various Supplies, G = +1
–50 VS = ±5V, VOUT = 4V p-p
–60 VS = ±2.5V, VOUT = 4V p-p
VS = +2V/–1V, VOUT = 1V p-p
–70
–80
HD2 VS = ±5V
HD2 VS = ±2.5V
–90
–100
–110
HD2 VS = +2V/–1V
–120
–130
–140
–150
–160
1
HD3 VS = +2V/–1V
HD3 VS = ±2.5V
HD3 VS = ±5V
10 100 1000
FREQUENCY (kHz)
Figure 19. Distortion vs. Frequency, G = +2
Rev. B | Page 11 of 25
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ADA4805-1.PDF ] | |
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