ADA4950-2 Datasheet PDF - Analog Devices
| Part Number | ADA4950-2 | |
| Description | (ADA4950-1/-2) Low Power Selectable Gain Differential ADC Driver | |
| Manufacturers | Analog Devices | |
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Low Power, Selectable Gain
Differential ADC Driver, G = 1, 2, 3
ADA4950-1/ADA4950-2
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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.
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ADA4950-1/ADA4950-2
5 V OPERATION
TA = 25°C, +VS = 5 V, −VS = 0 V, VOCM = 2.5 V, G = 1, RT = 53.6 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 52 for signal definitions.
Differential Inputs to VOUT, dm Performance
www.datasheet4u.com
Table 4.
Parameter
Test Conditions/Comments
DYNAMIC PERFORMANCE
−3 dB Small-Signal Bandwidth
VOUT, dm = 0.1 V p-p
−3 dB Large-Signal Bandwidth
VOUT, dm = 2.0 V p-p
Bandwidth for 0.1 dB Flatness
VOUT, dm = 2.0 V p-p, RL = 200 Ω
ADA4950-1
ADA4950-2
Slew Rate
VOUT, dm = 2 V p-p, 25% to 75%
Settling Time to 0.1%
VOUT, dm = 2 V step
Overdrive Recovery Time
VIN = 0 V to 2.5 V ramp, G = 2
NOISE/HARMONIC PERFORMANCE
See Figure 51 for distortion test circuit
Second Harmonic
VOUT, dm = 2 V p-p
1 MHz
10 MHz
20 MHz
50 MHz
Third Harmonic
VOUT, dm = 2 V p-p
1 MHz
10 MHz
20 MHz
50 MHz
IMD3
f1 = 30 MHz, f2 = 30.1 MHz, VOUT, dm = 2 V p-p
Voltage Noise (Referred to Input)
f = 1 MHz
Gain = 1
Gain = 2
Gain = 3
Crosstalk (ADA4950-2)
f = 10 MHz; Channel 2 active, Channel 1
output
INPUT CHARACTERISTICS
Offset Voltage (Referred to Input)
V+DIN = V−DIN = VOCM = 2.5 V
TMIN to TMAX variation
Input Capacitance
Single-ended at package pin
Input Common-Mode Voltage Range Directly at internal amplifier inputs, not
external input terminals
CMRR
DC, ∆VOUT, dm/∆VIN, cm, ∆VIN, cm = ±1 V
Open-Loop Gain
OUTPUT CHARACTERISTICS
Output Voltage Swing
Maximum ∆VOUT, single-ended output,
RL = 1 kΩ
Linear Output Current
200 kHz, RL, dm = 10 Ω, SFDR = 67 dB
Output Balance Error
∆VOUT, cm/∆VOUT, dm, ∆VOUT, dm = 1 V p-p, 1 MHz;
see Figure 50 for output balance test circuit
Gain Error
Gain = 1
Gain = 2
Gain = 3
Min Typ Max
770
320
220
160
2200
10
19
−108
−107
−98
−82
−124
−114
−99
−83
−94
9.2
12.5
16.6
−87
−4 ±0.4 +4
−3.7
0.5
–VS + 0.2 to
+VS – 1.8
−64 −49
64 66
–VS + 1.2 to
+VS – 1.2
–VS + 1.1 to
+VS – 1.1
70
−62
0.5 1.2
1.0 1.9
0.8 1.7
Unit
MHz
MHz
MHz
MHz
V/μs
ns
ns
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
nV/√Hz
nV/√Hz
dB
mV
μV/°C
pF
V
dB
dB
V
mA peak
dB
%
%
%
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