Dual High IP3, 700 MHz to 2800 MHz, Double Balanced,
Passive Mixer, IF Amplifier, and Wideband LO Amplifier
ADL5812
FUNCTIONAL BLOCK DIAGRAM
FEATURES
RF frequency: 700 MHz to 2800 MHz continuous
LO frequency: 250 MHz to 2800 MHz, high-side or
low-side inject
40
39
38
37
36
35
34
33
32
31
RF1
RFCT1
NC
1
2
30
29
28
27
26
V1LO1
NC
IF range: 30 MHz to 450 MHz
Power conversion gain of 6.7 dB at 1900 MHz
SSB noise figure of 11.6 dB at 1900 MHz
Input IP3 of 27.2 dBm at 1900 MHz
Input P1dB of 12.5 dBm at 1900 MHz
Typical LO drive of 0 dBm
ADL5812
3
NC
NC
4
NC
NC
5
LOIP
BIAS
GEN
NC
6
25 LOIN
24 LE
Single-ended, 50 Ω RF port
NC
7
Single-ended or balanced LO input port
Single-supply operation: 3.6 V to 5.0 V
Serial port interface control on all functions
Exposed paddle 6 mm × 6 mm, 40-lead LFCSP package
NC
8
23 DATA
SERIAL
PORT
INTERFACE
RFCT2
RF2
CLK
9
22
21
V2LO1
10
11
12
13
14
15
16
17
18
19
20
APPLICATIONS
Figure 1.
Multiband/multistandard cellular base station diversity
receivers
Wideband radio link diversity downconverters
Multimode cellular extenders and broadband receivers
GENERAL DESCRIPTION
The ADL5812 uses revolutionary new broadband, square wave
limiting, local oscillator (LO) amplifiers to achieve an
wideband applications where in-band blocking signals may
otherwise result in the degradation of dynamic range. Blocker
noise figure performance is comparable to narrow-band passive
mixer designs. High linearity IF buffer amplifiers follow the
passive mixer cores, yielding typical power conversion gains of
6.7 dB, and can be used with a wide range of output
impedances. For low voltage applications, the ADL5812 is
capable of operation at voltages down to 3.6 V with
substantially reduced current. Two logic bits are provided to
individually power down (1.5 mA for both channels) the two
channels as desired.
unprecedented radio frequency (RF) bandwidth of 700 MHz
to 2800 MHz. Unlike conventional narrow-band sine wave LO
amplifier solutions, this permits the LO to be applied either
above or below the RF input over an extremely wide bandwidth.
Because energy storage elements are not used, the dc current
consumption also decreases with decreasing LO frequency.
The ADL5812 uses highly linear, doubly balanced, passive mixer
cores along with integrated RF and LO balancing circuits to
allow single-ended operation. The ADL5812 incorporates
programmable RF baluns, allowing optimal performance over
a 700 MHz to 2800 MHz RF input frequency. The balanced
passive mixer arrangement provides outstanding LO-to-RF and
LO-to-IF leakages, excellent RF-to-IF isolation, and excellent
intermodulation performance over the full RF bandwidth.
All features of the ADL5812 are controlled via a 3-wire serial
port interface, resulting in optimum performance and
minimum external components.
The ADL5812 is fabricated using a BiCMOS high performance
IC process. The device is available in a 40-lead, 6mm × 6mm,
LFCSP package and operates over a −40°C to +85°C
The balanced mixer cores also provide extremely high input
linearity, allowing the device to be used in demanding
temperature range. An evaluation board is also available.
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2011 Analog Devices, Inc. All rights reserved.
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