2

dc2520af

DEMO MANUAL DC2520A

DC890 QUICK START PROCEDURE

Check to make sure that all jumpers are set to their default

settings as described in the DC2520A Jumpers section of

this manual. The default connections configure the ADC to

use the onboard reference and regulators to generate all

therequiredbiasvoltages.Theanaloginputsbydefaultare

DC coupled. Connect the DC2520A to a DC890 USB High

Speed Data Collection Board using connector P1. Then,

connect the DC890 to a host PC with a standard USB A/B

cable. Apply ±9V to the indicated terminals. Then apply

a low jitter signal source to J5 and J6. Use J7 to route

the signal sources of J5 and J6 to the desired AIN0-AIN3

inputs. Observe the recommended input voltage range

wave or square wave to connector J1. See the Assembly

Options table for the appropriate clock frequency. Note

that J1 has a 50Ω termination resistor to ground.

later) which can be downloaded from www.linear.com/

designtools/software.

Complete software documentation is available from the

Help menu. Updates can be downloaded from the Tools

menu. Check for updates periodically as new features

may be added.

The PScope software should recognize the DC2520A and

configure itself automatically.

Click the Collect button (See Figure 3) to begin acquiring

data. The Collect button then changes to Pause, which

can be clicked to stop data acquisition.

DC590/DC2026 QUICK START PROCEDURE

IMPORTANT! To avoid damage to the DC2520A, make

sure that VCCIO (JP6 of the DC590, JP3 of the DC2026)

of the DC590/DC2026 is set to 3.3V before connecting

the DC590/DC2026 to the DC2520A.

TousetheDC590/DC2026withtheDC2520A,itisnecessary

to apply ±9V and ground to the ±9V and GND terminals of

the DC2520A. Connect the DC590/DC2026 to a host PC

with a standard USB A/B cable. Connect the DC2520A to

a DC590/DC2026 USB serial controller using the supplied

14-conductor ribbon cable. Apply a signal source to J5

and J6. Use J7 to route the signal sources of J5 and J6

to the desired AIN0-AIN3 inputs. No Clock is required on

J1 when using the DC590/DC2026. The clock signal is

provided by the DC590/DC2026.

Run the QuikEval software (quikeval.exe version K110 or

later)whichisavailablefromwww.linear.com/designtools/

software. The correct control panel will be loaded auto-

matically. Click the COLLECT button (Figure 6) to begin

reading the ADC.

ASSEMBLY OPTIONS

Assembly

Version

U1 Part Number

Max Conversion

Rate

Number of

Channels

Number of

Bits

Max CLK IN

Frequency

CLK IN/fs

Ratio

DC2520A-A

LTC2344-18

400ksps

4

18

68.8MHz

172

DC2520A-B

LTC2344-16

400ksps

4

16

68.8MHz

172