5 GHz, Low Distortion
ADC Driver/Line Driver
Data Sheet
ADA4960-1
Re
v. A
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FEATURES
−3 dB bandwidth of 5 GHz (A
V
= 6 dB)
Single resistor programmable gain: 0 dB to 18 dB
Differential or single-ended input to differential output
Low harmonic distortion (HD2/HD3 @ A
V
= 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 (A
V
= 6 dB, 2 V step)
6600 V/μs (A
V
= 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
FUNCTIONAL BLOCK DIAGRAM
IIP
VIP
PD
VCC
VOCM
VOP
VON
GND
IIN
VIN
R
G
BIAS CELL
ADA4960-1
08458-001
F
igure 1.
1.2
1.0
0.8
0.6
0.4
0.2
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
0
–0.2 0 0.2
A
V
= 6dB
A
V
= 18dB
0.4 0.6 0.8 1.0
TIME
(ns)
V
OUT
(V)
08458-047
80%
20%
A
V
= 12dB
A
V
(dB) SLEW RATE (V/µs)
8700
7700
6
12
18 6600
F
igure 2. Rise Time, VOUT = 2 V p-p, TA = 25°C,
For AV = 6 dB, AV = 12 dB, and AV = 18 dB
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 (R
G
) 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.
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.
