HT8950/HT8950A

Voice Modulator

Pin Assignment

Rev. 1.10

1

November 16, 2006

Features

HT8950A: 16-pin DIP package

Applications

General Description

The HT8950/HT8950A are single chip CMOS LSI voice

modulator ICs which provide seven steps to shift the fre-

quency of an input voice, producing a dramatic change

in the output.

The HT8950/HT8950A provide two special effects: Vi-

brato and Robot. The Vibrato effect is generated by al-

ternating the frequency of an input signal up and down

at a rate of 8Hz. The Robot function, on the other hand,

converts an input voice into a Robot voice. Both effects

can be selected depending on which pin is triggered, ei-

ther ROB or VIB. For the output frequency level shifting,

the chips provide seven steps which can be selected

from the two groups of pins namely, SW0, SW1 and

SW2 for electronic direct selection and ROB, TGD, TGU

and VIB for push button selection.

The HT8950/HT8950A include a built-in microphone

amplifier with an internal bias, an 8-bit A/D converter, a

built-in SRAM as well as a current output type 8-bit D/A

converter. The 8-bit A/D and D/A converters with a sam-

pling rate of 8kHz ensures a high quality and high S/N

ratio output voice. The chips provide an LED indicator

which flashes in accordance with the volume of the input

voices.

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

1

2

3

4

5

6

7

8

O S C 2

F V I B

T S

V R E F

A U D I O

L A M P

V D D

A I N

O S C 1

V I B

T G U

T G D

R O B

V S S

N C

A O

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

1

2

3

4

5

6

7

8

9

R O B

T G D

T G U

V I B

O S C 1

O S C 2

F V I B

T S

V R E F

S W 0

S W 1

S W 2

V S S

A O

A I N

V D D

L A M P

A U D I O

H T 8 9 5 0

1 8 D I P - A

H T 8 9 5 0 A

1 6 D I P - A