HT8970
Electrical Characteristics
Ta=25°C
Test Conditions
Conditions
¾
Symbol
Parameter
Min. Typ. Max. Unit
VDD
¾
VCC
ICC
Operating Voltage
4.5
¾
5.0
15
5.5
30
V
mA
dB
Operating Current
5V
5V
5V
5V
5V
¾
GV
Voltage Gain
2.5
¾
RL=47kW
THD=10%
30kHz L.P.F.
DIN Audio
¾
-0.9
1.8
0.7
-85
VOMAX
THD
NO
Maximum Output Voltage
Total Harmonic Distortion
Output Noise Voltage
0.9
¾
Vrms
%
1.5
-60
dBV
¾
DVCC=-20dBV
(0.1Vrms)
f=100Hz
Power Supply Rejection
Ratio
PSRR
5V
dB
¾
-40
-30
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.
Echo mode
V
1
O
U
T
V
I
N
L
P
F
D
A
/
e
D
l
a
D
y
/
A
L
P
F
2
·
Surround mode
V
I
N
V
O
U
T
2
L
P
F
1
D
A
/
e
D
l
a
D
y
/
A
L
P
F
5
March 14, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
