LTM9002_15 Datasheet, PDF (1/28 Pages) Linear Technology – 14-Bit Dual-Channel IF/ Baseband Receiver Subsystem

LTM9002
14-Bit Dual-Channel IF/
Baseband Receiver Subsystem
FEATURES
n _{Integrated Dual 14-Bit, High-Speed ADC, Passive}
Filters and Fixed Gain Differential Amplifiers
n _{Up to 300MHz IF Range}
Lowpass and Bandpass Filter Versions
n _{Integrated Low Noise, Low Distortion Amplifiers}
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}
APPLICATIONS
n _{Telecommunications}
n _{Direct Conversion Receivers}
n _{Main and Diversity Receivers}
n _{Cellular Base Stations}
DESCRIPTION
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 filter and two low
noise, differential amplifiers. It is designed for digitizing
wide dynamic range signals with an intermediate frequency
(IF) up to 300MHz. The amplifiers allow either AC- or DC-
coupled input drive. Lowpass or bandpass filter 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.
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.
TYPICAL APPLICATION
Dual Channel IF Receiver
V_CC = 3V
V_DD
V_REF
MAIN
RF
LO
DIVERSITY
RF
LO
INA⁺
SAW
INA^–
DIFFERENTIAL
AMPLIFIERS
INB⁺
SAW
INB^–
FILTER
DAC
DAC
FILTER
14-BIT
125Msps ADC
14-BIT
125Msps ADC
GND
OV_DD
0.5V TO 3.6V
CLKOUT
ADC CLK
SPI
MUX
OF
9002 TA01
OGND
64k Point FFT, f_IN = 15MHz, –1dBFS,
SENSE = V_DD, Channel A (LTM9002-LA)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30
FREQUENCY (MHz)
9002 TA01b
9002f
1