6.5 GHz, Ultrahigh Dynamic Range,
Differential Amplifier
Data Sheet
ADL5569
FEATURES
FUNCTIONAL BLOCK DIAGRAM
PDB
16
VCOM
15
VCC
14
−3 dB bandwidth: 6.5 GHz typical
Preset 20 dB voltage gain, can be reduced by adding
external resistors
ADL5569
Differential or single-ended input to differential output
Internally dc-coupled inputs and outputs
R
R
F
G
1
2
13 VON
VIN
VIP
500Ω
GM
50Ω
Low noise input stage: 9.3 dB noise figure at 2 GHz
Low distortion at 5 V supply and 2 V p-p output with 100 Ω load
500 MHz: −78 dBc (HD2), −71 dBc (HD3), −80 dBc (IMD3)
2 GHz: −64 dBc (HD2), −52 dBc (HD3), −65 dBc (IMD3)
Input voltage noise (NSD, RTI): 1.0 nV/√Hz at 100 MHz
Single-supply operation: ac-coupled applications
Dual-supply operation: dc-coupled applications
Slew rate: 24 V/ns at 2 V p-p output
B
R
G
R
F
12
11
VOP
GND
500Ω
50Ω
3
GND
R
R
F
G
VOP2
VON2
4
5
10
9
VIP2
VIN2
DC power consumption: 86 mA per amplifier at 5 V
500Ω
GM
50Ω
B
R
R
F
G
APPLICATIONS
50Ω
500Ω
Differential ADC drivers for GSPS ADCs
High speed data acquisition
Single-ended to differential conversion
DAC buffering
DC coupling and level shifting
RF/IF gain blocks
6
7
8
PDB2 VCOM2 VCC2
NOTES
1. R IS THE SERIES RESISTANCE OF THE AMPLIFIER,
AND R IS THE FEEDBACK RESISTANCE
G
F
Balun alternative from dc to 4 GHz
SAW filter interfacing
OF THEAMPLIFIER.
Figure 1.
GENERAL DESCRIPTION
The ADL5569 is a high performance, dual, differential amplifier
with 20 dB of voltage gain, optimized for applications spanning
from dc to 6.5 GHz. The amplifier is available in a dual format,
and it offers a low referred to input (RTI) noise spectral density
(NSD) of 1.0 nV/√Hz (at 100 MHz) and excellent distortion
performance over a wide frequency range, making it an ideal
driver for high speed 12-bit to 16-bit analog-to-digital converters
(ADCs). The ADL5569 is ideally suited for use in high perfor-
mance zero intermediate frequency (IF) and complex IF receiver
designs. In addition, this device has excellent low distortion for
single-ended input driver applications.
3.0 V, providing a flexible capability for driving ADCs with
ac levels up to 2 V p-p.
Operating from a single 5 V supply, the quiescent current of the
ADL5569 is typically 86 mA per amplifier. When disabled, the
amplifiers consume only 8 mA per amplifier.
The device is optimized for wideband, low distortion, and low
noise operation, giving it unprecedented second harmonic
distortion (HD2) and third harmonic distortion (HD3) from
dc to 4 GHz. These attributes, together with its adjustable gain
capability, make this device the amplifier of choice for driving a
wide variety of ADCs, mixers, pin diode attenuators, surface
acoustic wave (SAW) filters, and a multitude of discrete radio
frequency (RF) devices.
Using two external series resistors for each amplifier expands
the gain flexibility of the amplifier and allows any gain selection
from 6 dB to 20 dB for a differential input. For a single-ended
input, the gain can be adjusted from 6 dB to 17 dB with the
addition of some external resistors. This device maintains low
distortion through its output common-mode range of 2.0 V to
Fabricated on an Analog Devices, Inc., high speed silicon germa-
nium (SiGe) process, the ADL5569 is supplied in a compact
2.5 mm × 3 mm, 16-lead LFCSP package and operates over the
−40°C to +85°C temperature range.
Rev. C
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Trademarks andregisteredtrademarks are the property of their respective owners.
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