ADA4960-1_16 Datasheet, PDF (1/21 Pages) Analog Devices – 5 GHz, Low Distortion ADC Driver/Line Driver

FEATURES
−3 dB bandwidth of 5 GHz (AV = 6 dB)
Single resistor programmable gain: 0 dB to 18 dB
Differential or single-ended input to differential output
Low harmonic distortion (HD2/HD3 @ AV = 6 dB)
−88/−69 dBc @ 250 MHz
−77/−66 dBc @ 500 MHz
−73/−72 dBc @ 1 GHz
IMD3 @ 1 GHz = −63 dBc
Slew rate
8700 V/μs (AV = 6 dB, 2 V step)
6600 V/μs (AV = 18 dB, 2 V step)
Fast settling: 1 ns to 1%, 1.4 ns to 0.1%
Fast overdrive recovery: 6.7 ns to 1%, 9.3 ns to 0.5%
Single-supply operation: 5 V
0.1 dB gain flatness to 300 MHz
DC level translation
Available in 16-lead LFCSP
APPLICATIONS
Differential ADC drivers for giga-sample ADCs
GBPS line drivers with pre-emphasis
High speed data acquisition
Electronic surveillance countermeasures
Pulse capture and conditioning
Oscilloscopes
Satellite communications
Single-ended-to-differential converters
RF/IF gain blocks
GENERAL DESCRIPTION
The ADA4960-1 is a high performance, differential amplifier
optimized for RF and IF applications. It achieves better than 63 dB
IMD3 performance for frequencies up to and beyond 1 GHz,
making it an ideal driver for 8-bit to 10-bit giga-sample analog-
to-digital converters (ADCs).
The buffered inputs of the ADA4960-1 isolate the gain-setting
resistor (RG) from the signal inputs, maintaining a constant 10 kΩ
input resistance, easing matching and input drive requirements.
The ADA4960-1 has a nominal 150 Ω differential output impedance.
The ADA4960-1 is optimized for wideband, low distortion
performance for frequencies up to and beyond 1 GHz. These
attributes, together with its adjustable gain capability, make this
device the amplifier of choice for general-purpose IF and broad-
band applications where low distortion, noise, and power are critical.
Rev. 0
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5 GHz, Low Distortion
ADC Driver/Line Driver
ADA4960-1
FUNCTIONAL BLOCK DIAGRAM
PD
VIP
IIP
R_G
IIN
BIAS CELL
VCC
VOCM
VOP
VON
VIN
GND
ADA4960-1
Figure 1.
1.2
1.0
0.8
0.6
80%
A_V = 6dB
A_V = 12dB
A_V = 18dB
0.4
0.2
0
A_V (dB) SLEW RATE (V/µs)
6
8700
–0.2
12
7700
–0.4
18
6600
–0.6
20%
–0.8
–1.0
–1.2
–0.2
0
0.2
0.4
0.6
0.8
1.0
TIME (ns)
Figure 2. Rise Time, VOUT = 2 V p-p, TA = 25°C,
For AV = 6 dB, AV = 12 dB, and AV = 18 dB
The device is optimized for the best combination of slew rate,
bandwidth, and broadband distortion. These attributes allow it
to drive a wide variety of ADCs. It is ideally suited for driving
mixers, pin diode attenuators, SAW filters, and multi-element
discrete devices.
The user accessible gain adjust and bandwidth extension features
allow configuration of the ADA4960-1 for line driver and
channel equalization applications.
The quiescent current of the ADA4960-1 is typically 60 mA. When
disabled, it consumes less than 3 mA, offering excellent input-to-
output isolation.
Fabricated on an Analog Devices, Inc., high speed SiGe process,
the ADA4960-1 is available in a compact 3 mm × 3 mm, 16-lead
LFCSP. It operates over the temperature range of −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
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