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Linear Technology LTM9004 Manual

14-bit direct conversion receiver subsystem
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FeaTures
Integrated Dual 14-Bit, High-Speed ADC, Lowpass
n
Filter, Differential Gain Stages and I/Q Demodulator
Lowpass Filter for Each ADC Channel
n
1.92MHz (LTM9004-AA)
4.42MHz (LTM9004-AB)
9.42MHz (LTM9004-AC)
20MHz (LTM9004-AD)
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
applicaTions
Telecommunications
n
Direct Conversion Receivers
n
Cellular Basestations
n
Typical applicaTion
V
= 5V
CC1
LNA
OFFSET ADJUST
DC OFFSET
CONTROL
V
CC3
V
CC2
I
0°
90°
Q
LO
2
For more information
14-Bit Direct Conversion
Receiver Subsystem
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
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.
= 3V
V
DD
ADC
ADC
LTM9004-AD
GND
DAC
9004 TA01
www.linear.com/LTM9004
LTM9004
®
LTM9004-AA: 64k Point FFT
f
= 1950.5MHz, –1dBFS
IN
SENSE = V
OV
DD
0
0.5V TO
–10
3.6V
–20
–30
–40
CLKOUT
–50
HD2
–60
ADC CLK
MUX
HD3
–70
OF
–80
–90
–100
–110
–120
OGND
8
0
FREQUENCY (MHz)
receiver that
DD
12
16
20
9004 TA01b
9004fa
1

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Summary of Contents for Linear Technology LTM9004

  • Page 1 Telecommunications Direct Conversion Receivers 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. Cellular Basestations All other trademarks are the property of their respective owners.

  • Page 2: Absolute Maximum Ratings

    (Notes 1, 2) Supply Voltage (V ) ..... –0.3V to 5.5V Supply Voltage (V , LTM9004-AA, LTM9004-AB) ........... –0.3V to 5.5V Supply Voltage (V , LTM9004-AC, LTM9004-AD) ........... –0.3V to 3.5V Supply Voltage (V , OV ) ..... –0.3V to 4.0V Digital Output Ground Voltage (OGND) ..
  • Page 3 = 25°C. Unless otherwise noted, V = 5V, V = OV = 3V, V = 3V (LTM9004-AC, LTM9004-AD), V = 5V (LTM9004-AA, LTM9004-AB), P = 0dBm. (Note 3) SYMBOL PARAMETER CONDITIONS UNITS RF Input Frequency Range No External Matching (High Band) 1.5 to 2.7...
  • Page 4 T = 25°C. Unless otherwise noted, V = 5V, V = OV = 3V, V = 3V (LTM9004-AC, LTM9004-AD), V = 5V (LTM9004-AA, LTM9004-AB), P = 0dBm. SYMBOL PARAMETER CONDITIONS UNITS IIP3 Input 3rd-Order Intercept, 1 Tone...
  • Page 5 Input Pull-Up Resistance = 5V, V = 0V to 0.5V kΩ AMP1ENABLE Turn On Time Turn Off Time Second Amplifier Logic Input (AMP2ENABLE, LTM9004-AA, LTM9004-AB) High Level Input Voltage = 5V – 0.6 Low Level Input Voltage = 5V – 2.1...
  • Page 6 T = 25°C. Unless otherwise noted, V = 5V, V = OV = 3V. V = 3V (LTM9004- AC, LTM9004-AD), V = 5V (LTM9004-AA, LTM9004-AB) (Note 3) SYMBOL PARAMETER CONDITIONS UNITS Mixer Supply Voltage 5.25 First Amplifier Supply Voltage 5.25...

  • Page 7: Power Requirements

    T = 25°C. Unless otherwise noted, V = 5V, V = OV = 3V. V = 3V (LTM9004- AC, LTM9004-AD), V = 5V (LTM9004-AA, LTM9004-AB) (Note 3) SYMBOL PARAMETER CONDITIONS UNITS Sleep Power MIXENABLE = AMPxENABLE = 0V,...
  • Page 8 LTM9004 TiMing DiagraMs Dual Digital Output Bus Timing N + 2 N + 4 ANALOG INPUT N + 1 N + 3 N + 5 CLKI = CLKQ N – 5 N – 4 N – 3 N – 2 N –...
  • Page 9 LTM9004 Typical perForMance characTerisTics LTM9004-AA: 64k Point FFT LTM9004-AA: 64k Point FFT = 700.5MHz, –1dBFS = 1950.5MHz, –1dBFS LTM9004-AA, Baseband SENSE = V SENSE = V Frequency Response –10 –10 –5 –20 –20 –10 –30 –30 –15 –40 –40 –20 –50...
  • Page 10 LTM9004 Typical perForMance characTerisTics LTM9004-AD: 64k Point FFT LTM9004-AD: 64k Point FFT = 705.0MHz, –1dBFS = 1955.0MHz, –1dBFS LTM9004-AD, Baseband SENSE = V SENSE = V Frequency Response –10 –10 –5 –10 –20 –20 –15 –30 –30 –20 –40 –40 –25...
  • Page 11 Amplifiers. The specified operating range is 4.5V to 5.5V for Source or sink current through this pin to trim DC offset. LTM9004-AA and LTM9004-AB. The specified operating range is 2.7V to 3.5V for LTM9004-AC and LTM9004-AD. Control Pins is internally bypassed to GND.
  • Page 12 LTM9004 pin FuncTions Connecting ADCSHDNI to V and OEI to GND results in I-channel comes out on DQ0 to DQ13. To multiplex both nap mode with the outputs at high impedance. Connecting channels onto a single output bus, connect MUX, CLKQ...

  • Page 13: Block Diagram

    LTM9004 block DiagraM AMP1 AMP2 MODE ENABLE ENABLE ENABLE SHDN . . . OUTPUT DRIVERS REFH REFL CLKOUT 1.5V OGND REFERENCE RANGE SELECT DIFF BUFFER SENSE 9004 BD Figure 1. Functional Block Diagram (Only One Channel is Shown) 9004fa For more information...
  • Page 14 The final subsystem is then tested to the exact parameters defined for the application. For this reason, the LTM9004 provides for DC offset cor- The final result is a fully integrated, accurately tested and rection immediately following the I/Q demodulator stage.
  • Page 15 When CLK goes back high, the second stage produces its residue which is acquired by the third stage. An identical Each channel of the LTM9004 consists of two stages of process is repeated for the third, fourth and fifth stages,...
  • Page 16 LTM9004 applicaTions inForMaTion RF INPUT at lower frequencies, however, the input return loss can be improved with the matching network shown in Figure 3. Figure 3 shows the mixer’s RF input which consists of an Shunt capacitor C10 and series capacitor C11 can be...
  • Page 17 LTM9004 applicaTions inForMaTion 90° phase-shifted LO signals for the LO buffer amplifiers The LO input impedance and S11 parameters (without driving the I/Q mixers. The primary side of the transformer external matching components) are listed in Table 2. is connected to the LO input pin. The secondary side of Table 2.
  • Page 18 LTM9004 applicaTions inForMaTion Enable Interface is achieved with a logic low level on the SHDN pins and a high level disables the respective functions. The enable voltage necessary to turn on the mixer is 2V. To disable or turn off the mixer, this voltage should be It is not recommended to enable or shut down individual below 1V.
  • Page 19 The specified minimum operating frequency ing on how much SNR degradation will be experienced. for the LTM9004 is 1Msps. For high crest factor signals such as WCDMA or OFDM, where the nominal power level must be at least 6dB to...
  • Page 20 LTM9004 applicaTions inForMaTion For applications where the sample rate needs to be changed LTM9004 quickly, the clock duty cycle stabilizer can be disabled. If 0.5V TO 3.6V the duty cycle stabilizer is disabled, care should be taken 0.1µF to make the sampling clock have a 50% (±5%) duty cycle.
  • Page 21 Design Example – UMTS Uplink FDD System The ADC has a delayed version of the CLKQ input available The LTM9004 can be used with an RF front end to build a as a digital output, CLKOUT. The falling edge of the CLKOUT complete UMTS band uplink receiver.
  • Page 22 37dB rejection of this tone, so it will appear at the input of ferers are a CW tone and a WCDMA channel at –44dBm the LTM9004 at –32dBm. Here again, a signal at this level each. These will appear at the LTM9004 input at –29dBm must not desensitize the baseband module.
  • Page 23 Pb-based or tin-based solder paste. It is inherently Pb-free and complies with the JEDEC (e4) standard. The materials Most of the heat generated by the LTM9004 is transferred declaration is available online at http://www.linear.com/ through the bottom-side ground pads. For good electrical leadfree/mat_dec.jsp.
  • Page 24 LTM9004 applicaTions inForMaTion Figure 11. Layer 1 Figure 12. Layer 2 9004fa For more information www.linear.com/LTM9004...
  • Page 25 LTM9004 applicaTions inForMaTion Figure 13. Layer 3 Figure 14. Layer 4 9004fa For more information www.linear.com/LTM9004...
  • Page 26 LTM9004 package DescripTion Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. LGA Package 204-Lead (22mm × 15mm × 2.91mm) (Reference LTC DWG # 05-08-1822 Rev C) LGA Package 204-Lead (22mm × 15mm × 2.91mm) (Reference LTC DWG # 05-08-1822 Rev C)

  • Page 27: Revision History

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 28 Amplifiers, Up to 300MHz IF Range, 15mm × 11.25mm LGA Package 9004fa Linear Technology Corporation LT 0514 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTM9004  LINEAR TECHNOLOGY CORPORATION 2011 ● ●...

This manual is also suitable for:

Ltm9004-abLtm9004-aaLtm9004-ac