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PDF ADA4927-2 Data sheet ( Hoja de datos )
| Número de pieza | ADA4927-2 | |
| Descripción | (ADA4927-1/-2) Ultralow Distortion Current Feedback Differential ADC Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Ultralow Distortion
Current Feedback Differential ADC Driver
ADA4927-1/ADA4927-2
www.daFtaEsAhTeeUt4RuE.cSom
Extremely low harmonic distortion
−105 dBc HD2 @ 10 MHz
−91 dBc HD2 @ 70 MHz
−87 dBc HD2 @ 100 MHz
−103 dBc HD3 @ 10 MHz
−98 dBc HD3 @ 70 MHz
−89 dBc HD3 @ 100 MHz
Better distortion at higher gains than VF amplifiers
Low input voltage noise: 1.4 nV/√Hz
High speed
−3 dB bandwidth of 2.3 GHz
0.1 dB gain flatness: 150 MHz
Slew rate: 5000 V/μs, 25% to 75%
Fast 0.1% settling time: 10 ns
Low input offset voltage: 0.3 mV typical
Externally adjustable gain
Stability and bandwidth controlled by feedback resistor
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Wide supply operation: +5 V to ±5 V
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Differential line drivers
GENERAL DESCRIPTION
The ADA4927 is a low noise, ultralow distortion, high speed,
current feedback differential amplifier that is an ideal choice for
driving high performance ADCs with resolutions up to 16 bits
from dc to 100 MHz. The output common-mode level can easily be
matched to the required ADC input common-mode levels. The
internal common-mode feedback loop provides exceptional output
balance and suppression of even-order distortion products.
Differential gain configurations are easily realized using an
external feedback network comprising four resistors. The
current feedback architecture provides loop gain that is nearly
independent of closed-loop gain, achieving wide bandwidth,
low distortion, and low noise at higher gains and lower power
consumption than comparable voltage feedback amplifiers.
The ADA4927 is fabricated using the Analog Devices, Inc., silicon-
germanium complementary bipolar process, enabling very low
levels of distortion with an input voltage noise of only 1.3 nV/√Hz.
Rev. 0
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.
FUNCTIONAL BLOCK DIAGRAMS
–FB 1
+IN 2
–IN 3
+FB 4
ADA4927-1
12 PD
11 –OUT
10 +OUT
9 VOCM
Figure 1.
–IN1 1
+FB1 2
+VS1 3
+VS1 4
–FB2 5
+IN2 6
ADA4927-2
18 +OUT1
17 VOCM1
16
15
––VVSS22
14 PD2
13 –OUT2
–40
VOUT, dm = 2V p-p
–50
Figure 2.
–60
–70
–80
–90
–100
–110
–120
G=1
G = 10
G = 20
–130
1
10 100
FREQUENCY (MHz)
1k
Figure 3. Spurious-Free Dynamic Range vs. Frequency at Various Gains
The low dc offset and excellent dynamic performance of the
ADA4927 make it well suited for a wide variety of data acquisition
and signal processing applications.
The ADA4927-1 is available in a Pb-free, 3 mm × 3 mm 16-lead
LFCSP, and the ADA4927-2 is available in a Pb-free, 4 mm × 4 mm
24-lead LFCSP. The pinouts are optimized to facilitate printed
circuit board (PCB) layout and to minimize distortion. They are
specified to operate over the −40°C to +105°C temperature range.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
1 page  
ADA4927-1/ADA4927-2
+5 V OPERATION
TA = 25°C, +VS = 5 V, −VS = 0 V, VOCM = 2.5 V, RF = 301 Ω, RG = 301 Ω, RT = 56.2 Ω (when used), RL, dm = 1 kΩ, unless otherwise noted.
All specifications refer to single-ended input and differential outputs, unless otherwise noted. Refer to Figure 46 for signal definitions.
±DIN to VOUT, dm Performance
www.datasheet4u.com
Table 4.
Parameter
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
Second Harmonic
Third Harmonic
IMD
Voltage Noise (RTI)
Input Current Noise
Crosstalk
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
CMRR
Open-Loop Transresistance
OUTPUT CHARACTERISTICS
Output Voltage Swing
Linear Output Current
Output Balance Error
Conditions
VOUT, dm = 0.1 V p-p
VOUT, dm = 2.0 V p-p
VOUT, dm = 0.1 V p-p, ADA4927-1
VOUT, dm = 0.1 V p-p, ADA4927-2
VOUT, dm = 2 V step, 25% to 75%
VOUT, dm = 2 V step
VIN = 0 V to 0.15 V step, G = 10
See Figure 45 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
f1 = 140 MHz, f2 = 140.1 MHz, VOUT, dm = 2 V p-p
f = 100 kHz, G = 28
f = 100 kHz, G = 28
f = 100 MHz, ADA4927-2
VIP = VIN = VOCM = 0 V
tMIN to tMAX variation
tMIN to tMAX variation
Differential
Common mode
Differential
∆VOUT, dm/∆VIN, cm, ∆VIN, cm = ±1 V
DC
Each single-ended output
∆VOUT, cm/∆VOUT, dm, ∆VOUT, dm = 1 V, 10 MHz,
see Figure 44 for test circuit
Min Typ Max Unit
2000
1300
150
110
4200
10
10
MHz
MHz
MHz
MHz
V/μs
ns
ns
−104
−91
−86
−95
−80
−76
−93
−84
1.4
19
−75
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
pA/√Hz
dB
−1.3
−30
−10.5
1.3
−70
120
+0.3
±1.5
−12
±0.12
−0.8
14
120
0.5
−96
185
+1.3
+4.0
+10.5
3.7
mV
μV/°C
μA
μA/°C
μA
Ω
kΩ
pF
V
dB
kΩ
+1.0
50
−65
+4.0 V
mA p-p
dB
Rev. 0 | Page 5 of 24
5 Page 
–40
VOUT, dm = 2V p-p
–50
–60
–70
www.datashee–t480u.com
–90
–100
–110
–120
–130
1
HD2, RL = 1kΩ
HD3, RL = 1kΩ
HD2, RL = 200Ω
HD3, RL = 200Ω
10 100
FREQUENCY (MHz)
1k
Figure 19. Harmonic Distortion vs. Frequency at Various Loads
–40
VOUT, dm = 2V p-p
–50
–60
–70
–80
–90
–100
–110
–120
–130
1
HD2, VS = ±5V
HD3, VS = ±5V
HD2, VS = ±2.5V
HD3, VS = ±2.5V
10 100
FREQUENCY (MHz)
1k
Figure 20. Harmonic Distortion vs. Frequency at Various Supplies
–20
VOUT, dm = 2V p-p
–30
–40
–50
–60
–70
–80
–90
–100
–110
HD2, 10MHz
HD3, 10MHz
–120
–1.2 –1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 1.2
VOCM (V)
Figure 21. Harmonic Distortion vs. VOCM at 10 MHz, ±2.5 V Supplies
ADA4927-1/ADA4927-2
–40
VOUT, dm = 2V p-p
–50
–60
–70
–80
–90
–100
–110
–120
–130
1
10 100
FREQUENCY (MHz)
HD2, G = 1
HD3, G = 1
HD2, G = 10
HD3, G = 10
HD2, G = 20
HD3, G = 20
1k
Figure 22. Harmonic Distortion vs. Frequency at Various Gains
–30
VOUT, dm = 2V p-p
–40
–50
–60
–70
–80
–90
–100
–110
HD2, VS = ±5V
HD3, VS = ±5V
–120
HD2, VS = ±2.5V
HD3, VS = ±2.5V
–130
012 3456 789
VOUT, dm (V p-p)
Figure 23. Harmonic Distortion vs. VOUT, dm and Supply Voltage, f = 10 MHz
–40
VOUT, dm = 2V p-p
–50
–60
–70
HD2, 10MHz
HD3, 10MHz
–80
–90
–100
–110
–120
–4 –3 –2 –1
0
1
2
3
4
VOCM (V)
Figure 24. Harmonic Distortion vs. VOCM at 10 MHz, ±5 V Supplies
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADA4927-2.PDF ] | |
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