LTM9002
1
9002f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
14-Bit Dual-Channel IF/
Baseband Receiver Subsystem
The LTM
®
9002 is a 14-bit dual-channel IF receiver sub-
system. Utilizing an integrated system in a package (SiP)
technology, it includes a dual high-speed 14-bit A/D con-
verter, matching network, anti-aliasing fi lter and two low
noise, differential amplifi ers. It is designed for digitizing
wide dynamic range signals with an intermediate frequency
(IF) up to 300MHz. The amplifi ers allow either AC- or DC-
coupled input drive. Lowpass or bandpass fi lter networks
can be implemented with various bandwidths. Contact
Linear Technology regarding customization.
The LTM9002 is perfect for demanding communications
applications, with AC performance that includes 66dB SNR
and 76dB spurious free dynamic range (SFDR). Auxiliary
DACs allow gain balancing between channels.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V logic.
An optional multiplexer allows both channels to share a
digital output bus. Two single-ended CLK inputs can be
driven together or independently. An optional clock duty
cycle stabilizer allows high performance at full speed for
a wide range of clock duty cycles.
Dual Channel IF Receiver
n
Integrated Dual 14-Bit, High-Speed ADC, Passive
Filters and Fixed Gain Differential Amplifi ers
n
Up to 300MHz IF Range
Lowpass and Bandpass Filter Versions
n
Integrated Low Noise, Low Distortion Amplifi ers
Fixed Gain: 8dB, 14dB, 20dB or 26dB
50Ω, 200Ω or 400Ω Input Impedance
n
Integrated Bypass Capacitance, No External
Components Required
n
66dB SNR Up to 140MHz Input (LTM9002-AA)
n
76dB SFDR Up to 140MHz Input (LTM9002-AA)
n
Auxiliary 12-Bit DACs for Gain Adjustment
n
Clock Duty Cycle Stabilizer
n
Single 3V to 3.3V Supply
n
Low Power: 1.3W (665mW/ch.)
n
Shutdown and Nap Modes
n
15mm × 11.25mm LGA Package
n
Telecommunications
n
Direct Conversion Receivers
n
Main and Diversity Receivers
n
Cellular Base Stations
OF
GND
LO
V
CC
= 3V
V
DD
DIFFERENTIAL
AMPLIFIERS
MAIN
RF
INA
–
INA
+
V
REF
OV
DD
0.5V TO 3.6V
SAW
FILTER
MUX
CLKOUT
ADC CLK
SPI
14-BIT
125Msps ADC
9002 TA01
LO
DIVERSITY
RF
INB
–
INB
+
OGND
SAW
FILTER
14-BIT
125Msps ADC
DAC
DAC
FREQUENCY (MHz)
AMPLITUDE (dBFS)
9002 TA01b
0
–80
–70
–90
–100
–110
–60
–50
–40
–30
–20
–10
–120
0 5 10 15 20 25 30
64k Point FFT, f
IN
= 15MHz, –1dBFS,
SENSE = V
DD
, Channel A (LTM9002-LA)
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
