DC1642A-AB - LINEAR TECHNOLOGY - Datasheet.Directory

dc1642af

DEMO MANUAL DC1642A

Description

LTM9003

12-Bit Digital Predistortion

Receiver Subsystem

Demonstration circuit DC1642A is an evaluation board fea-

turing Linear Technology Corporation’s LTM

9003 12-Bit

predistortion receiver subsystem. DC1642A demonstrates

good circuit layout techniques and recommended external

circuitry for optimal system performance.

DC1642A comes with Linear Technology’s 12-bit LTM9003

receiver subsystem installed. The board includes output

LVDS buffers. DC1642A plugs into the DC890 data acqui-

sition demo board using an FT149 adapter card and the

output can be easily analyzed with Linear Technology’s

PScope™ data processing software, which is available

for no charge on our website at http://www.linear.com.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks

and PScope is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Validating the performance of the LTM9003 is simple

with DC1642A, and requires only two input sources, a

clock source, a computer, and a lab power supply. Refer

to Figure 1 for proper board evaluation equipment setup

and follow the procedure below:

1. Connect the power supply as shown in Figure 1. There

are on-board low-noise voltage regulators that provide

the supply voltage for the DC1642A. The entire board

and all components share a common ground. The power

supply should still be a low-noise lab power supply

capable of supplying at least 1A.

2. Provide an encode clock to the ADC via SMA connector

J7. Use a low-phase-noise clock source such as a filtered

RF signal generator or a high-quality clock oscillator.

Note: Similar to having a noisy input, a high-jitter (phase

noise) encode clock will degrade the signal-to-noise ratio

(SNR) of the system.

3. Apply an RF input signal to the board. For best results,

use a low distortion, low noise signal generator with

sufficient filtering to avoid degrading the performance

of the receiver.

4. Apply an LO input signal to the board. Note that the

difference in frequency between this signal and the RF

signal will be the IF frequency resulting at the IF filter

and ADC input.

5. Observe the ADC output with the FT149 adapter card

connected to the DC890, a USB cable, a Windows

computer, and Linear Technology’s PScope data pro-

cessing software. Note that the DC890 will also require

an external 6V/1A power supply when receiving LVDS

outputs.

quick start proceDure

Table 1. DC1642A Variants

DC1624 VARIANTS PART NUMBER SFDR SUPPLY VOLTAGE BANDPASS FILTER

1624A-AA LTM9003A-AA 58.8dB 2.5V ADC, 3.3V Amplifier, 3.3V Mixer 184MHz Center, 125MHz Bandwidth

1624A-AB LTM9003A-AB 62.4dB 2.5V ADC, 3.3V Amplifier, 5V Mixer 184MHz Center, 125MHz Bandwidth

orDer options

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DEMO MANUAL DC1642A

quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Table 2. DC1642A Connectors and Jumpers

REFERENCE FUNCTION

J2 (Mode) Output Format and Clock Duty Stabilizer Pin. Default is VDD.

J3 (SHDN/OE) Enables/Disables the ADC. Default is ON.

J4 (Sense) Reference Input to Adjust the Full-Scale Range of the DC1642A. Default is VDD.

J5 (RF) Board RF Signal Input. Impedance-matched to 50Ω for use with lab signal generators.

J6 (Mixer/Amplifier Enable) Enables/Disables the RF Mixer and Amplifier. Default is ON.

J7 (CLK) Board Clock Input. Impedance-matched to 50Ω. Drive with a low-phase-noise clock oscil-lator or filtered sine wave

signal source.

J9 (LO) Board LO Signal Input. Impedance-matched to 50Ω for use with lab signal generators.

TP1 (External Reference) Reference Input to Adjust the Full-Scale Range of the LTM9003. Connects to the SENSE pin; by default, tied to VDD for

internal reference.

TP2 (GND) DC Ground.

TP3 (3.3V) DC Supply Input (3.3VDC).

TP4 (GND) DC Ground.

TP5 (5V) DC Supply Input (5VDC).

Signal

Generator

HP 8644B

or Equivalent

BPF *

RF Signal Generator

(HP 8644B) or Other

Low Phase Noise

Clock Source (e.g. DC1216) BPF

Signal

Generator

HP 8644B

or Equivalent

BPF

Power Supply +5V at 200mA

Power Supply +3.3V at 1A

To FT149+

DC890B

* Note: Even a high-quality signal synthesizer

will still have noise and harmonics that should

be attenuated with a low-pass or band-pass

ﬁlter. For good-quality high order ﬁlters, see

TTE, Lark Engineering, or equivalent.

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DEMO MANUAL DC1642A

Figure 2. Entering the Correct Device Information for Your ADC. Select the Correct Parameters for the DC1642A. Under

Normal Conditions, PScope Should Automatically Recognize the Board and Adjust the Software Settings Accordingly

Other Board Circuitry

Device U1 is an EEPROM device that is used by the PScope

software to identify the board and apply the correct set-

tings for the data collection.

Using PScope Software

PScope, downloadable from Linear Technology’s website

at http://www.linear.com/software, processes data from the

DC890 QuikEval II data acquisition board and displays FFT

and signal analysis information on the computer screen.

The on-board EEPROM U1 should enable automatic board

detection and auto-configuration of the software.

From the Configure menu in the toolbar, uncheck “Au-

todetect Device.” The default settings for DC1642A are

shown in Figure 2.

quick start proceDure

dc1642af

DEMO MANUAL DC1642A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

LTM9003CV, Demo Board #1642A

1 1 C4 Capacitor, NPO, 8.2pF, 50V, 0.25pF, 0402 AVX/04025A8R2CAT2A

2 4 C1, C2, C10, C44 Capacitor, X5R, 0.01µF, 16V, 0.1, 0402 AVX/0402YC103KAT

3 10 C19, C27-C32, C34, C35, C36 Capacitor, X5R, 0.1µF, 10V, 0.1, 0402 AVX/0402ZD104KAT

4 1 C45 Capacitor, X5R, 10µF, 6.3V, 0.2, 0805 AVX/08056D106MAT

5 4 C5, C6, C8, C9 Capacitor, X5R, 4.7µF, 10V, 0.2, 0805 AVX/0805ZD475MAT

6 2 C3, C7 Capacitor, X7R, 0.1µF, 16V, 0.1, 0603 AVX/0603YC104KAT

7 0 C37, C42 Capacitor, DNI

8 1 C39 Capacitor, NPO, 0.5pF, 50V, 0.25pF, 0402 AVX/04025A0R5CAT2A

9 1 C43 Capacitor, NPO, 1pF, 50V, 0.25pF, 0402 AVX/04025A1R0CAT2A

10 1 J1 Connector, HSMC, Mezzanine Samtec/ASP-122952-01

11 4 J2, J3, J4, J6 Header, 3×2, 2mm Samtec/TMM-103-02-L-D

12 3 J5, J7, J9 Connector, SMA Female Edge Mount E.F.JOHNSON/142-0701-851

13 1 J8 Header, 2×1, 2mm Samtec/TMM-102-02-L-S

14 1 L1 Inductor, 3.9nH, 5%, 0402 Coilcraft/0402CS-3N9XJLW

15 1 L5 Inductor, 2.7nH, 5%, 0402 Coilcraft/0402CS-2N7XJLW

16 0 R41 Resistor, DNI

17 0 R52 Resistor, 0.01, 1/16W, 0603 Vishay, CRCW0603XXXX

18 3 R3, R13, R14 Resistor, 0Ω Jumper, 0805 Vishay, CRCW08050000ZOEA

19 1 R50 Resistor, 0Ω Jumper, 1206 NIC, NRC12ZOTR

20 6 R37, R42-R46 Resistor, 10Ω, 0.01, 1/4W, 1206 Vishay, CRCW120610R0FNEA

21 17 R17-R23, R28, R30-R35, R38-R40 Resistor, 100Ω, 0.01, 39833, 0201 Vishay, CRCW0201100RFNED

22 4 R6, R8, R53, R54 Resistor, 1000Ω, 0.01, 1/10W, 0603 Vishay, CRCW06031K00FKEA

23 3 R10, R24, R48 Resistor, 100k, 0.01, 39829, 0402 Vishay, CRCW0402100KFKED

24 2 R12, R49 Resistor, 10k, 0.01, 39829, 0402 Vishay, CRCW040210K0FKED

25 1 R47 Resistor, 32.4k, 0.01, 39829, 0402 Vishay, CRCW040232K4FKED

26 3 R4, R5, R51 Resistor, 4.99Ω, 0.01, 39829, 0402 Vishay, CRCW04024R99FKED

27 2 R1, R2 Resistor, 49.9Ω, 0.01, 39829, 0402 Vishay, CRCW040249R9FKED

28 2 R7, R11 Resistor, 499Ω, 0.01, 1/10W, 0603 Vishay, CRCW0603499RFKEA

29 5 R25, R26, R27, R29, R36 Resistor, 4990Ω, 0.01, 39829, 0402 Vishay, CRCW04024K99FKED

30 1 R9 Resistor, 64.9k, 0.01, 39829, 0402 Vishay, CRCW040264K9FKED

31 1 T2 XFRMR, 1:1, SMT, SM-22 Macom/MABA-007159-000000

32 5 TP1-TP5 Turret Mill_Max/2308-2

33 1 U1 IC, Serial_EEPROM, TSSOP8 Microchip/24LC025-I_ST

34 2 U3, U4 IC, RPTR, LVDS, OCTAL, SMT, TSSOP Fairchild/FIN1108

35 2 U5, U10 IC, VREG, ADJ, 500MA, DFN Linear Technology/LT1763CDE

36 6 XJP2, XJP3, XJP4, XJP6 (See Drawing) SHUNT Samtec 2SN-BK-G

37 3 (Stand-Off) Stand-Off, Nylon, 0.25" Keystone/ 8831(Snap On)

38 2 Stencil, Component & Solder Sides

LTM9003CV-AA, Demo Board #1642A-AA

1 1 DC1642AA General BOM

2 0 R15 Resistor, DNI

3 1 R16 Resistor, 0Ω Jumper, 0805 Vishay CRCW08050000Z0EA

4 1 U2 I.C., µModule Linear Tech. Corp. LTM9003CV-AA

5 1 Printed Circuit Board Demo Circuit 1642A

LTM9003CV-AB, Demo Board #1642A-AB

1 1 DC1642AA General BOM

2 1 R15 Resistor, 0Ω Jumper, 0805 Vishay CRCW08050000Z0EA

3 0 R16 Resistor, DNI

4 1 U2 I.C., µModule Linear Tech. Corp. LTM9003CV-AB

5 1 Printed Circuit Board Demo Circuit 1642A

dc1642af

DEMO MANUAL DC1642A

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.

schematic Diagram

dc1642af

DEMO MANUAL DC1642A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0411 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

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Mailing Address:

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1630 McCarthy Blvd.

Milpitas, CA 95035