LTM9004_15 Datasheet, PDF (1/28 Pages) Linear Technology – 14-Bit Direct Conversion Receiver Subsystem

LTM9004
14-Bit Direct Conversion
Receiver Subsystem
Features
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}
Applications
n _{Telecommunications}
n _{Direct Conversion Receivers}
n _{Cellular Basestations}
Description
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.
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.
Typical Application
V_CC1 = 5V
I
0°
LNA
OFFSET ADJUST
90°
Q
DC OFFSET
LO
CONTROL
2
V_CC2
V_CC3 = 3V
V_DD
ADC
ADC
OV_DD
0.5V TO
3.6V
CLKOUT
ADC CLK
MUX
OF
GND
LTM9004-AD
OGND
DAC
9004 TA01
For more information www.linear.com/LTM9004
LTM9004-AA: 64k Point FFT
f_IN = 1950.5MHz, –1dBFS
SENSE = V_DD
0
–10
–20
–30
–40
–50 _HD2
–60
–70
HD3
–80
–90
–100
–110
–120
0
4
8
12
16
20
FREQUENCY (MHz)
9004 TA01b
9004fa
1