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dc1959af

DEMO MANUAL DC1959A

 

 

 

 

 

Frequency reference 

input, SMA 

Differential 

output, SMA 

3.3 V DC supply, 

banana jacks 

5 V DC 

supply, 

banana 

jacks 

Ribbon 

cable 

connection 

to DC590 

Loop filter 

components 

Mute 

jumper 

Description

LTC6948

Ultralow Noise and Spurious Fractional-N

Synthesizer with Integrated VCO

Demonstration circuit 1959A features the LTC6948, an

Ultralow Noise and Spurious Fractional-N Synthesizer

with Integrated VCO.

There are four options of the DC1959A, one for each ver-

sion of the LTC6948. Table 1 summarizes the available

DC1959A options.

The DC1959A provides 50Ω SMA connectors for the ref-

RF output (RF+ and RF–).

L

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

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

property of their respective owners.

A DC590 USB serial controller board is used for SPI com-

munication with the LTC6948, controlled by the supplied

FracNWizard™ software.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1959A

Figure 1. DC1959A Connections