HT8950/HT8950A
Voice Modulator
Features
· Operating voltage: 2.4V~4.0V
· 8-bit A/D and D/A converters
· On-chip SRAM
· LED indicator with voice level
· Robot function
· Push button selection or electronic mode
· Vibrato function
· Minimal external components
· 8kHz sampling rate
· HT8950: 18-pin DIP package
HT8950A: 16-pin DIP package
· 7-step level shifting
Applications
· Educational Toys/leisure products
· Audio system
· Mixers
· Speech system
· Recorders
· Telephone system
General Description
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 are single chip CMOS LSI voice
modulator ICs which provide seven steps to shift the frequency of an input voice, producing a dramatic change
in the output.
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 sampling 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.
The HT8950/HT8950A provide two special effects: Vibrato and Robot. The Vibrato effect is generated by alternating 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, either ROB or VIB. For the output frequency level shifting,
the chips provide seven steps which can be selected
Pin Assignment
S W 0
1
1 8
R O B
S W 1
2
1 7
T G D
O S C 1
1
1 6
O S C 2
S W 2
3
1 6
T G U
V IB
2
1 5
F V IB
V S S
4
1 5
V IB
T G U
3
1 4
T S
A O
5
1 4
O S C 1
T G D
4
1 3
V R E F
A IN
6
1 3
O S C 2
R O B
5
1 2
A U D IO
V D D
7
1 2
F V IB
V S S
6
1 1
L A M P
L A M P
8
1 1
T S
N C
7
1 0
V D D
A U D IO
9
1 0
V R E F
A O
8
9
A IN
H T 8 9 5 0
1 8 D IP -A
Rev. 1.10
H T 8 9 5 0 A
1 6 D IP -A
1
November 16, 2006
