DC1250A-AA Linear Technology, DC1250A-AA Datasheet

DC1250A-AA

Manufacturer Part Number

DC1250A-AA

Description

BOARD EVAL LTM9001-AA

Manufacturer

Linear Technology

Type

Baseband Receiverr

Datasheets

1.DC1241B-AA.pdf (30 pages)

2.DC1250A-AA.pdf (5 pages)

Specifications of DC1250A-AA

Design Resources

Demo Circuit 1250A Schematic

Frequency

0Hz ~ 300MHz

Features

LTM9001 16bit Receiver Subsystem, 162MHz BPF

Tool / Board Applications

Wireless Connectivity-ZigBee, RF, Infrared, USB

Mcu Supported Families

LTM9001

Development Tool Type

Hardware - Eval/Demo Board

For Use With/related Products

LTM9001

Lead Free Status / RoHS Status

Not applicable / Not applicable

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DESCRIPTION

Demonstration circuit 1250 is an evaluation board featur-

ing Linear Technology Corporation’s LTM9001 16-bit

Receiver Subsystem. DC1250 demonstrates good circuit

layout techniques and recommended external circuitry

for optimal system performance.

DC1250 comes installed with one of Linear Technology’s

16-bit LTM9001 amplifier/ADC subsystems. The board

includes a wideband input transformer (for evaluation

with a single-ended RF signal generator) and output

CMOS buffers. The LTM9001 is also capable of gene-

QUICK START PROCEDURE

Validating the performance of the LTM9001 is simple

with DC1250, and requires only an input source, 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

2. Provide an encode clock to the ADC via SMA connec-

Table 1: DC1250 Connectors and Jumpers

are on-board low-noise voltage regulators that provide

the three supply voltages for the LTM9001. The entire

board and all components share a common ground.

The power supply should still be a low-noise lab pow-

er supply capable of supplying at least 1 Amp.

tor J3. Use a low-phase-noise clock source such as a

filtered RF signal generator or a high-quality clock os-

cillator. Obtain DC1216 for a low-phase-noise ADC

clock source that can plug directly into DC1250.

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.

REFERENCE

J1 (AIN+)

J2 (AIN-)

FUNCTION

Board Signal Input. Impedance-matched to

50Ω for use with lab signal generators.

Differential Board Input. Normally not con-

nected. See text for differential-input evalua-

16-BIT HIGH PERFORMANCE ADC DRIVERS

rating LVDS outputs – for evaluation of the part with

LVDS outputs, obtain DC1241. DC1250 plugs into the

DC890 Data Acquisition demo board 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. Call

the LTC factory.

3. Apply an input signal to the board. DC1250 allows

4. Observe the ADC output with demo circuit DC890, a

, LTC and LT are registered trademarks of Linear Technology Corporation.

USB cable, a Windows computer, and Linear Technol-

ogy’s

great flexibility in applying input signals (see the sec-

tion on Applying Input Signals). For best results, use a

low distortion, low noise signal generator with suffi-

cient filtering to avoid degrading the performance of

the amplifier and ADC.

J3 (ENC)

E1 (EXT REF)

JP5 (AMP_EN)

JP1 (PGA_GAIN)

JP2 (RAND)

JP3 (ADC_SHDN)

JP4 (DITH)

LTM9001 16-bit Receiver

Pscope

DEMO CIRCUIT 1250

QUICK START GUIDE

tion methods.

Board Clock Input. Impedance-matched to

50Ω. Drive with a low-phase-noise clock oscil-

lator or filtered sine wave signal source.

Reference input to adjust the full-scale range of

the LTM9001. Connects to the SENSE pin; by

default, tied to VDD for internal reference.

Enables the LTM9001 amplifier. Default is EN.

Selects the input range of LTM9001. Default is

LOW (low PGA gain, larger input range)

Output Randomizer. NORM is default.

Enables the LTM9001 ADC. Default is NORM.

ADC Internal Dither. Default is OFF.

data

processing

Subsystem

software.

Related parts for DC1250A-AA

DC1250A-AA Summary of contents

Page 1

... Design files for this circuit board are available. Call the LTC factory. , LTC and LT are registered trademarks of Linear Technology Corporation. tion methods. J3 (ENC) Board Clock Input. Impedance-matched to 50Ω. Drive with a low-phase-noise clock oscil- lator or filtered sine wave signal source ...

Page 2

LTM9001 16-BIT RECEIVER SUBSYSTEM 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. Signal Generator BPF ...

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DC1250A-AA Linear Technology, DC1250A-AA Datasheet

DC1250A-AA

Specifications of DC1250A-AA

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DC1250A-AA Summary of contents

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