AD9020

–12–

REV. A

AD9020/PCB EVALUATION BOARD

The AD9020/PCB Evaluation Board is available from the fac-

tory and is shown here in block diagram form. The board in-

cludes a reference circuit that allows the user to adjust both

references and the quarter-point voltages. The AD9617 is in-

cluded as the drive amplifier, and the user can configure the

gain from –1 to –15.

On-board reconstruction of the digital data is provided through

the AD9713, a 12-bit monolithic DAC. The analog and recon-

structed waveforms can be summed on the board to allow the

user to observe the linearity of the AD9020 and the effects of

the quarterpoint voltages. The digital data and an adjustable

Data Ready signal are available through a 37-pin edge connector.

AD9020/PCB Evaluation Board Block Diagram

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

68-Leaded Ceramic Chip Carrier

68-Terminal

(Z-68)

Leadless Chip Carrier (LCC)

(E-68A)

REFERENCE

CIRCUIT

AD9020

DUT

ANALOG

INPUT

50

Ω

DUT

ANALOG

INPUT

J2

200

Ω

400

Ω

24

Ω

BUFFERED

ANALOG

INPUT

TO ERROR

WAVEFORM

CIRCUIT

OUTPUT

DATA

CONNECTOR

TTL

LATCHES

TTL CLK

ENCODE

TIMING

CIRCUIT

CLK

Q

DATA

READY

50

Ω

DAC

OUT

TO ERROR

WAVEFORM

CIRCUIT

AD9617

U5

D

MSB INVERT

5V

–

5V

+

LSBs INVERT

OVERFLOW

D

D

D

D

D

D

D

D

D

D

D

GND

+5V