LTM9004
1
9004fa
V
CC1
= 5V
V
CC3
= 3V
V
CC2
V
DD
LNA
0°
90°
I
Q
LO
2
DC OFFSET
CONTROL
LTM9004-AD
GND
OGND
9004 TA01
DAC
OF
ADC
MUX
ADC CLK
CLKOUT
OV
DD
0.5V TO
3.6V
OFFSET ADJUST
ADC
For more information
www.linear.com/LTM9004
Typical applicaTion
DescripTion
14-Bit Direct Conversion
Receiver Subsystem
The
LTM
®
9004
is a 14-bit direct conversion receiver sub-
system. Utilizing an integrated system in a package (SiP)
technology, the LTM9004 is a μModule
®
receiver that
includes a dual high speed 14-bit A/D converter, lowpass
filter, differential gain stages and a quadrature demodula-
tor. Contact Linear Technology regarding customization.
The LTM9004 is perfect for zero-IF communications
applications, with AC performance that includes 76dB
SNR and 63.5dB spurious free dynamic range (SFDR).
The entire chain is DC-coupled and provides access for
DC offset adjustment. The integrated on-chip broadband
transformers provide 50Ω single-ended interfaces at the
RF and LO inputs.
A 5V supply powers the mixer and first amplifier for
minimal distortion while a 3V supply allows low power
ADC operation. A separate supply allows the outputs to
drive 0.5V to 3.3V logic. An optional multiplexer allows
both channels to share a digital output bus. An optional
clock duty cycle stabilizer allows high performance at full
speed for a wide range of clock duty cycles.
FeaTures
applicaTions
n
Integrated Dual 14-Bit, High-Speed ADC, Lowpass
Filter, Differential Gain Stages and I/Q Demodulator
n
Lowpass Filter for Each ADC Channel
1.92MHz
(LTM9004-AA)
4.42MHz
(LTM9004-AB)
9.42MHz
(LTM9004-AC)
20MHz
(LTM9004-AD)
n
RF Input Frequency Range: 0.7GHz to 2.7GHz
n
50Ω Single-Ended RF and LO Ports
n
I/Q Gain Mismatch: 0.2dB Typical
n
I/Q Phase Mismatch: 1.5 Deg Typical
n
Voltage-Adjustable Demodulator DC Offsets
n
76dB/1.92MHz SNR (LTM9004-AA)
n
63.5dB SFDR (LTM9004-AA)
n
Clock Duty Cycle Stabilizer
n
Low Power: 1.83W
n
Shutdown and Nap Modes
n
15mm
×
22mm LGA Package
n
Telecommunications
n
Direct Conversion Receivers
n
Cellular Basestations
LTM9004-AA: 64k Point FFT
f
IN
= 1950.5MHz, –1dBFS
SENSE = V
DD
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. µModule is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–90
–80
–70
–60
–50
–40
–30
–20
–10
20
9004 TA01b
–100
–120
4
8
16
12
0
–110
HD2
HD3
