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PDF ADA4938-2 Data sheet ( Hoja de datos )
| Número de pieza | ADA4938-2 | |
| Descripción | Ultra-Low Distortion Differential ADC Driver | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Extremely low harmonic distortion (HD)
−106 dBc HD2 @ 10 MHz
−82 dBc HD2 @ 50 MHz
−109 dBc HD3 @ 10 MHz
−82 dBc HD3 @ 50 MHz
Low input voltage noise: 2.6 nV/√Hz
High speed
−3 dB bandwidth of 1000 MHz, G = +1
Slew rate: 4700 V/μs
0.1 dB gain flatness to 150 MHz
Fast overdrive recovery of 4 ns
1 mV typical offset voltage
Externally adjustable gain
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Wide supply voltage range: +5 V to ±5 V
Single or dual amplifier configuration available
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4938-1/ADA4938-2 are low noise, ultralow distortion,
high speed differential amplifiers. It is an ideal choice for
driving high performance ADCs with resolutions up to 16 bits
from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The
output common-mode voltage is adjustable over a wide range,
allowing the ADA4938-1/ADA4938-2 to match the input of the
ADC. The internal common-mode feedback loop also provides
exceptional output balance as well as suppression of even-order
harmonic distortion products.
Full differential and single-ended-to-differential gain configurations
are easily realized with the ADA4938-1/ADA4938-2. A simple
external feedback network of four resistors determines the
closed-loop gain of the amplifier.
The ADA4938-1/ADA4938-2 are fabricated using the Analog
Devices, Inc., proprietary third generation, high voltage XFCB
process, enabling it to achieve very low levels of distortion with
an input voltage noise of only 2.6 nV/√Hz. The low dc offset and
excellent dynamic performance of the ADA4938-1/ADA4938-2
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.
Ultralow Distortion
Differential ADC Driver
ADA4938-1/ADA4938-2
FUNCTIONAL BLOCK DIAGRAMS
ADA4938-1
TOP VIEW
–FB 1
+IN 2
–IN 3
+FB 4
12 PD
11 –OUT
10 +OUT
9 VOCM
Figure 1. ADA4938-1 Functional Block Diagram
ADA4938-2
TOP VIEW
–IN1 1
+FB1 2
+VS1 3
+VS1 4
–FB2 5
+IN2 6
18 +OUT1
17 VOCM1
16 –VS2
15 –VS2
14 PD2
13 –OUT2
Figure 2. ADA4938-2 Functional Block Diagram
–50 G = +2, VO, dm = 5V p-p
–60
G = +2, VO, dm = 3.2V p-p
G = +2, VO, dm = 2V p-p
G = +2, VO, dm = 1V p-p
–70
–80
–90
–100
–110
–120
–130
1
10
FREQUENCY (MHz)
100
Figure 3. SFDR vs. Frequency and Output Voltage
makes them well-suited for a wide variety of data acquisition and
signal processing applications.
The ADA4938-1 (single amplifier) is available in a Pb-free,
3 mm × 3 mm, 16-lead LFCSP. The ADA4938-2 (dual
amplifier) is available in a Pb-free, 4 mm × 4 mm, 24-lead
LFCSP. The pinouts have been optimized to facilitate layout and
minimize distortion. The devices are specified to operate over
the extended industrial temperature range of −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
ADA4938-1/ADA4938-2
SINGLE-SUPPLY OPERATION
TA = 25°C, +VS = 5 V, −VS = 0 V, VOCM = +VS/2, RT = 61.9 Ω, RG = RF = 200 Ω, G = +1, RL, dm = 1 kΩ, unless otherwise noted.
All specifications refer to single-ended input and differential output, unless otherwise noted. For gains other than G = 1, values for RF and
RG are shown in Table 11.
±DIN to ±OUT Performance
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Large Signal Bandwidth
Slew Rate
Settling Time
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
Second Harmonic
Third Harmonic
Input Voltage Noise
Noise Figure
Input Current Noise
Crosstalk (ADA4938-2)
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Resistance
Input Capacitance
Input Common-Mode Voltage
CMRR
OUTPUT CHARACTERISTICS
Output Voltage Swing
Linear Output Current
Output Balance Error
Conditions
VOUT = 0.1 V p-p
VOUT = 2 V p-p
VOUT = 2 V p-p
VOUT = 2 V p-p
VOUT = 2 V p-p
VIN = 2.5 V to 0 V step, G = +2
VOUT = 2 V p-p, 10 MHz
VOUT = 2 V p-p, 50 MHz
VOUT = 2 V p-p, 10 MHz
VOUT = 2 V p-p, 50 MHz
f = 10 MHz
G = +4, f = 10 MHz
f = 10 MHz
f = 100 MHz
VOS, dm = VOUT, dm/2; VDIN+ = VDIN− = VOCM = 2.5 V
TMIN to TMAX variation
TMIN to TMAX variation
Differential
Common mode
∆VOUT, dm/∆VIN, cm; ∆VIN, cm = ±1 V
Maximum ∆VOUT; single-ended output
Per amplifier, RL, dm = 20 Ω, f = 10 MHz
∆VOUT, cm/∆VOUT, dm; ∆VOUT, dm = 1 V
Min Typ
Max Unit
1000
150
750
3900
6.5
4
MHz
MHz
MHz
V/µs
ns
ns
−110
−79
−100
−79
2.6
15.8
4.8
−85
dBc
dBc
dBc
dBc
nV/√Hz
dB
pA/√Hz
dB
1
±4
−18 −13
−0.01
6
3
1
−VS + 0.3 to +VS − 1.6
−80
4
mV
µV/°C
µA
µA/°C
MΩ
MΩ
pF
V
dB
−VS + 1.2 to +VS − 1.2
±65
−60
V
mA
dB
Rev. B | Page 5 of 26
5 Page 
Data Sheet
6
3
0
–3
–6
–9
–12
1
G = +1
G = +2
G = +3.16
G = +5
10 100
FREQUENCY (MHz)
1000
Figure 19. Small Signal Frequency Response for Various Gains, RF = 402 Ω,
VS = 5 V, VOUT = 0.1 V p-p
3
0
–3
–6
–9
–12
1
VS = +5V
VS = ±5V
10 100
FREQUENCY (MHz)
1000
Figure 20. VOUT, cm Small Signal Frequency Response, VOUT = 0.1 V p-p
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
1
RL, dm = 1kΩ
RL, dm = 100Ω
RL, dm = 200Ω
10 100
FREQUENCY (MHz)
1000
Figure 21. 0.1 dB Flatness Response for Various Loads, ADA4938-1,
VOUT = 0.1 V p-p
ADA4938-1/ADA4938-2
6
3
0
–3
–6
–9
–12
1
G = +1
G = +2
G = +3.16
G = +5
10 100
FREQUENCY (MHz)
1000
Figure 22. Large Signal Frequency Response for Various Gains, RF = 402 Ω,
VS = 5 V
3
0
–3
–6
–9
–12
1
VS = +5V
VS = ±5V
10 100
FREQUENCY (MHz)
1000
Figure 23. VOUT, cm Large Signal Frequency Response
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
1
RL, dm = 1kΩ
RL, dm = 100Ω
RL, dm = 200Ω
10 100
FREQUENCY (MHz)
1000
Figure 24. 0.1 dB Flatness Response for Various Loads, ADA4938-2,
VOUT = 0.1 V p-p
Rev. B | Page 11 of 26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet ADA4938-2.PDF ] | |
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