HT8970 datasheet(5/9 Pages) HOLTEK

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Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VDD

Conditions

VCC

Operating Voltage

¾¾

4.5

5.0

5.5

ICC

Operating Current

¾¾

Voltage Gain

RL=47kW¾

-0.9

2.5

VOMAX Maximum Output Voltage

THD=10%

0.9

1.8

Vrms

THD

Total Harmonic Distortion

30kHz L.P.F.

0.7

1.5

Output Noise Voltage

DIN Audio

¾-85

-60

dBV

PSRR

Power Supply Rejection

Ratio

DVCC=-20dBV

(0.1Vrms)

f=100Hz

¾-40

-30

HT8970

March 14, 2000

Functional Description

The HT8970 is an echo/surround effect genera-

tor with built-in 20Kb SRAM. It ensures low

distortion as well as low noise for processing

audio signal delay. The chip provides two play-

ing modes (echo and surround) and the playing

function block diagrams are shown as follows.

· Surround mode

· Echo mode

LP F 1

A / D

De l a y

D/ A

L P F 2

V IN

V OU T

LP F 1

A / D

De l a y

D/ A

L P F 2

V IN

V OU T

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