9

®

PCM56

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.

FIGURE 11. Block Diagram of Distortion Test Circuit.

Distortion

Analyzer

(Shiba Soku Model

725 or Equivalent)

Programmable

Gain Amp

0dB to 60dB

Low-Pass

Filter

(Toko APQ-25

or Equivalent)

DUT

(PCM58P)

Parallel-to-Serial

Conversion

Digital Code

(EPROM)

Binary

Counter

Timing

Logic

Clock

Latch Enable

Sampling Rate = 44.1kHz x 4 (176.4kHz)

Output Frequency = 991Hz

Use 400Hz High-Pass

Filter and 30kHz

Low-Pass Filter

Meter Settings

LOW-PASS FILTER

CHARACTERISTIC

0

–20

–40

–60

–80

–100

–120

Frequency (Hz)

1

1010101010

12

3

4

5