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ADA4950-1 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4950-1
Beschreibung (ADA4950-1/-2) Low Power Selectable Gain Differential ADC Driver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
ADA4950-1 Datasheet, Funktion
Low Power, Selectable Gain
Differential ADC Driver, G = 1, 2, 3
ADA4950-1/ADA4950-2
www.daFtaEsAhTeeUt4RuE.cSom
High performance at low power
High speed
−3 dB bandwidth of 750 MHz, G = 1
0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω
Slew rate: 2900 V/μs, 25% to 75%
Fast 0.1% settling time of 9 ns
Low power: 9.5 mA per amplifier
Low harmonic distortion
108 dB SFDR @ 10 MHz
98 dB SFDR @ 20 MHz
Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
±0.2 mV typical input offset voltage
Selectable differential gains of 1, 2, and 3
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Input common-mode range shifted down by 1 VBE
Wide supply range: +3 V to ±5 V
Available in 16-lead and 24-lead LFCSP packages
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4950-1/ADA4950-2 are gain-selectable versions of the
ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors.
They are ideal choices for driving high performance ADCs as single-
ended-to-differential or differential-to-differential amplifiers. The
output common-mode voltage is user adjustable by means of an
internal common-mode feedback loop, allowing the ADA4950-1/
ADA4950-2 output to match the input of the ADC. The internal
feedback loop also provides exceptional output balance as well
as suppression of even-order harmonic distortion products.
Differential gain configurations of 1, 2, and 3 are easily realized
with internal feedback networks that are connected externally
to set the closed-loop gain of the amplifier.
The ADA4950-1/ADA4950-2 are fabricated using the Analog
Devices, Inc., proprietary silicon-germanium (SiGe) complementary
bipolar process, enabling them to achieve low levels of distortion and
noise at low power consumption. The low offset and excellent
dynamic performance of the ADA4950-x make it well suited for
a wide variety of data acquisition and signal processing applications.
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
+INB 1
+INA 2
–INA 3
+INB 4
ADA4950-1
12 PD
11 –OUT
10 +OUT
9 VOCM
Figure 1. ADA4950-1
–INA1 1
–INB1 2
+VS1 3
+VS1 4
+INB2 5
+INA2 6
ADA4950-2
18 +OUT1
17 VOCM1
16
15
––VVSS22
14 PD2
13 –OUT2
Figure 2. ADA4950-2
–40
VOUT, dm = 2V p-p
–50
–60 HD2, ±5V
–70
HD3, ±5V
HD2, ±2.5V
–80 HD3, ±2.5V
–90
–100
–110
–120
–130
–140
0.1
1 10
FREQUENCY (MHz)
100
Figure 3. Harmonic Distortion vs. Frequency at Various Supplies
The ADA4950-x is available in a Pb-free, 3 mm × 3 mm, 16-lead
LFCSP (ADA4950-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead
LFCSP (ADA4950-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4950-1/
ADA4950-2 are specified to operate over the −40°C to +105°C
temperature range; both operate on supplies from +3 V to ±5 V.
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
©2009 Analog Devices, Inc. All rights reserved.






ADA4950-1 Datasheet, Funktion
ADA4950-1/ADA4950-2
VOCM to VOUT, cm Performance
Table 5.
Parameter
VOCM DYNAMIC PERFORMANCE
www.d3atdaBshSemeat4llu-S.cigomnal Bandwidth
−3 dB Large-Signal Bandwidth
Slew Rate
Input Voltage Noise (Referred to Input)
VOCM INPUT CHARACTERISTICS
Input Voltage Range
Test Conditions/Comments
VOUT, cm = 100 mV p-p
VOUT, cm = 2 V p-p
VIN = 1.5 V to 3.5 V, 25% to 75%
f = 1 MHz
Input Resistance
Input Offset Voltage
VOCM CMRR
Gain
V+DIN = V−DIN = 2.5 V
ΔVOUT, dm/ΔVOCM, ΔVOCM = ±1 V
ΔVOUT, cm/ΔVOCM, ΔVOCM = ±1 V
Min
22
−6.5
0.98
General Performance
Table 6.
Parameter
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Power Supply Rejection Ratio
POWER-DOWN (PD)
PD Input Voltage
Turn-Off Time
Turn-On Time
PD Pin Bias Current per Amplifier
Enabled
Disabled
OPERATING TEMPERATURE RANGE
Test Conditions/Comments
TMIN to TMAX variation
Powered down
ΔVOUT, dm/ΔVS, ΔVS = 1 V p-p
Powered down
Enabled
Min
3.0
8.4
PD = 5 V
PD = 0 V
−1.0
−100
−40
Typ Max
240
90
380
9.8
–VS + 1.2 to
+VS – 1.2
26
+1.0
−60
1.0
32
+6.5
−49
1.01
Typ Max
11
8.9 9.6
31
0.6 0.9
−96 −84
≤(+VS – 2.5)
≥(+VS – 1.8)
600
29
+0.2 +1.0
−65 −40
+105
Unit
MHz
MHz
V/μs
nV/√Hz
V
mV
dB
V/V
Unit
V
mA
μA/°C
mA
dB
V
V
ns
ns
μA
μA
°C
Rev. 0 | Page 6 of 28

6 Page









ADA4950-1 pdf, datenblatt
ADA4950-1/ADA4950-2
–40
VOUT, dm = 2V p-p
–50
–60 HD2, ±5V
–70
HD3, ±5V
HD2, ±2.5V
www.datas80heet4u.coHmD3, ±2.5V
–90
–100
–110
–120
–130
–140
0.1
1 10
FREQUENCY (MHz)
100
Figure 25. Harmonic Distortion vs. Frequency at Various Supplies
–30
VOUT, dm = 2V p-p
–40
–50
–60
HD2 AT 10MHz
HD3 AT 10MHz
–70
HD2 AT 30MHz
HD3 AT 30MHz
–80
–90
–100
–110
–120
–130
–4 –3 –2 –1 0 1 2 3 4
VOCM (V)
Figure 26. Harmonic Distortion vs. VOCM at Various Frequencies, ±5 V Supplies
–40
–50
–60 HD2, VOUT, dm = 2V p-p
–70 HD3, VOUT, dm = 2V p-p
HD2, VOUT, dm = 4V p-p
–80 HD3, VOUT, dm = 4V p-p
–90
–100
–110
–120
–130
–140
0.1
1 10
FREQUENCY (MHz)
100
Figure 27. Harmonic Distortion vs. Frequency at Various VOUT, dm
–40
–50 VOCM = 0V
–60 HD2, ±5V
–70 HD3, ±5V
HD2, ±2.5V
–80 HD3, ±2.5V
–90
–100
–110
–120
–130
–140
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
VOUT, dm (V p-p)
Figure 28. Harmonic Distortion vs. VOUT, dm, f = 10 MHz
–40
–50 VOUT, dm = 2V p-p
–60
HD2 AT 10MHz
HD3 AT 10MHz
HD2 AT 30MHz
–70 HD3 AT 30MHz
–80
–90
–100
–110
–120
1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
VOCM (V)
Figure 29. Harmonic Distortion vs. VOCM at Various Frequencies, 5 V Supply
–50
VOUT, dm = 2V p-p
–60
–70
–80
–90
–100
–110
RL, dm = 200
RL, dm = 1k
–120
–130
–140
0.1
1 10
FREQUENCY (MHz)
100
Figure 30. Spurious-Free Dynamic Range vs. Frequency at Various Loads
Rev. 0 | Page 12 of 28

12 Page





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