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PDF ADA4937-2 Data sheet ( Hoja de datos )
| Número de pieza | ADA4937-2 | |
| Descripción | Dual Ultralow Distortion / Differential ADC Driver | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Extremely low harmonic distortion (HD)
−112 dBc HD2 at 10 MHz
−84 dBc HD2 at 70 MHz
−77 dBc HD2 at 100 MHz
−102 dBc HD3 at 10 MHz
−91 dBc HD3 at 70 MHz
−84 dBc HD3 at 100 MHz
Low input voltage noise: 2.2 nV/√Hz
High speed
−3 dB bandwidth of 1.9 GHz, G = 1
Slew rate: 6000 V/μs, 25% to 75%
Fast overdrive recovery of 1 ns
0.5 mV typical offset voltage
Externally adjustable gain
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Single-supply operation: 3.3 V to 5 V
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4937-1/ADA4937-2 are low noise, ultralow distortion,
high speed differential amplifiers. They are an ideal choice for
driving high performance ADCs with resolutions up to 16 bits
from dc to 100 MHz. The adjustable level of the output common
mode allows the ADA4937-1/ADA4937-2 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.
With the ADA4937-1/ADA4937-2, differential gain configurations
are easily realized with a simple external feedback network of
four resistors that determine the closed-loop gain of the amplifier.
The ADA4937-1/ADA4937-2 are fabricated using Analog Devices,
Inc., proprietary silicon-germanium (SiGe), complementary
bipolar process, enabling them to achieve very low levels of
distortion with an input voltage noise of only 2.2 nV/√Hz.
The low dc offset and excellent dynamic performance of the
ADA4937-1/ADA4937-2 make them well-suited for a wide
variety of data acquisition and signal processing applications.
Rev. E
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
ADA4937-1/ADA4937-2
FUNCTIONAL BLOCK DIAGRAMS
ADA4937-1
–FB 1
+IN 2
–IN 3
+FB 4
12 PD
11 –OUT
10 +OUT
9 VOCM
Figure 1. ADA4937-1
ADA4937-2
–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. ADA4937-2
–55 HD2, VS = 5.0V
–60 HD3, VS = 5.0V
–65
HD2, VS = 3.3V
HD3, VS = 3.3V
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
1
10
FREQUENCY (MHz)
100
Figure 3. Harmonic Distortion vs. Frequency
The ADA4937-1/ADA4937-2 are available in a Pb-free, 3 mm ×
3 mm, 16-lead LFCSP (ADA4937-1, single) or a Pb-free, 4 mm ×
4 mm, 24-lead LFCSP (ADA4937-2, dual). The pinout has been
optimized to facilitate PCB layout and minimize distortion.
The ADA4937-1/ADA4937-2 are specified to operate over the
automotive (−40°C to +105°C) temperature range and between
3.3 V and 5 V supplies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
ADA4937-1/ADA4937-2
3.3 V OPERATION
TA = 25°C, +VS = 3.3 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 outputs, unless otherwise noted.
±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
IMD
Voltage Noise (RTI)
Input Current Noise
Noise Figure
Crosstalk (ADA4937-2)
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
Test Conditions/Comments
VOUT, dm = 0.1 V p-p
VOUT, dm = 0.1 V p-p
VOUT, dm = 2 V p-p
VOUT, dm = 2 V p-p; 25% to 75%
VOUT, dm = 2 V p-p
VIN = 0 V to 1.0 V step; G = 3.16
See Figure 51 for distortion test circuit
VOUT, dm = 2 V p-p; 10 MHz
VOUT, dm = 2 V p-p; 70 MHz
VOUT, dm = 2 V p-p; 100 MHz
VOUT, dm = 2 V p-p; 10 MHz
VOUT, dm = 2 V p-p; 70 MHz
VOUT, dm = 2 V p-p; 100 MHz
f1 = 70 MHz; f2 = 70.1 MHz; VOUT, dm = 2 V p-p
f = 100 kHz
f = 100 kHz
G = 4; RT = 136 Ω; RF = 200 Ω; RG = 37 Ω; f = 100 MHz
f = 100 MHz
VOS, dm = VOUT, dm/2; VDIN+ = VDIN− = +VS/2
TMIN to TMAX variation
TMIN to TMAX variation
Differential
Common mode
∆VOUT, dm/∆VIN, cm; ∆VIN, cm = ±1 V
Maximum ∆VOUT; single-ended output; RF = RG = 10 kΩ
Per amplifier; RL, dm = 20 Ω; f = 10 MHz
∆VOUT, cm/∆VOUT, dm; ∆VOUT, dm = 1 V; f = 10 MHz;
see Figure 50 for test circuit
Min Typ
Max Unit
1800
200
1300
4000
7
<1
MHz
MHz
MHz
V/µs
ns
ns
−113
−85
−77
−95
−77
−71
−87
2.2
4
15
−72
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
pA/√Hz
dB
dB
−2.5 ±0.5
+2.5 mV
±1 µV/°C
−50 −30
−10 µA
0.01 µA/°C
6 MΩ
3 MΩ
1 pF
0.3 to 1.2
V
−67 −80
dB
0.8
±47
−61
2.5 V
mA
dB
Rev. E | Page 5 of 28
5 Page 
Data Sheet
3
VOCM = 1.0V
VOCM = 2.5V
VOCM = 3.9V
0
–3
–6
–9
–12
1
10 100
FREQUENCY (MHz)
Figure 19. Small Signal Frequency Response
for Various VOCM
1000
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
RRRRLLLL
=
=
=
=
1kΩ, ADA4937-1
100Ω, ADA4937-1
1kΩ, ADA4937-2
100Ω, ADA4937-2
10 100
FREQUENCY (MHz)
1000
Figure 20. 0.1 dB Flatness Response for Various Loads
–55 HD2, VS = 5.0V
–60 HD3, VS = 5.0V
–65
HD2, VS = 3.3V
HD3, VS = 3.3V
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
1
10
FREQUENCY (MHz)
100
Figure 21. Harmonic Distortion vs. Frequency and Supply Voltage
ADA4937-1/ADA4937-2
–50 HD2, G = +1, RF = 200Ω
HD3, G = +1, RF = 200Ω
–60 HD2, G = +2, RF = 402Ω
HD3, G = +2, RF = 402Ω
–70
–80
–90
–100
–110
–120
1
10
FREQUENCY (MHz)
100
Figure 22. Harmonic Distortion vs. Frequency and Gain
–50 HD2, RL = 1kΩ
HD3, RL = 1kΩ
–60 HD2, RL = 200Ω
HD3, RL = 200Ω
–70
–80
–90
–100
–110
–120
1
10
FREQUENCY (MHz)
100
Figure 23. Harmonic Distortion vs. Frequency and Load
–50 HD2, VS = 3.3V
–60
HD3, VS = 3.3V
HD2, VS = 5.0V
HD3, VS = 5.0V
–70
–80
–90
–100
–110
–120
–130
–1 0 1 2 3 4 5 6 7
VOUT (V)
Figure 24. Harmonic Distortion vs. VOUT and Supply Voltage
Rev. E | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADA4937-2.PDF ] | |
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