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PDF HT8950 Data sheet ( Hoja de datos )
| Número de pieza | HT8950 | |
| Descripción | Voice Modulator | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT8950 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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HT8950
Voice Modulator
Features
• Operating voltage: 2.4~4.0V
• On-chip SRAM
• Robot function
• Vibrato function
• 8kHz sampling rate
• 7-step level shifting
Applications
• Toys
• Mixers
• Recorders
General Description
The HT8950 is a single chip CMOS LSI voice
modulator. It provides 7 steps to shift the fre-
quency of an input voice, producing a dramati-
cal change in the output.
The HT8950 provides two special effects: Vi-
brato 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 func-
tion, 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 chip provides 7 steps which can be
selected from the two groups of pins namely,
• 8-bit A/D and D/A converters
• LED indicator with voice level
• Push button selection or electronic mode
• Few external components required
• 16-pin/18-pin DIP package
• Audio system
• Speech system
• Telephone system
SW0, SW1 and SW2 for electronic direct selec-
tion and ROB, TGD, TGU and VIB for push
button selection.
The HT8950 includes a built-in microphone am-
plifier with an internal bias, an 8-bit A/D con-
verter, 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 chip provides an LED indica-
tor which flashes with the volume of the input
voices. It is offered in a 16-pin or 18-pin DIP
package.
1 5th May ’98
1 page  
HT8950
Functional Description
The HT8950 is a single chip LSI designed for
voice modulation. It provides 7 steps to shift the
frequency of an input voice signal up and down.
The chip is also equipped with two special ef-
fects; Vibrato and Robot.
The HT8950 includes a built-in amplifier, 8-bit
A/D converter and current output type of 8-bit
D/A converter in addition to a built-in SRAM.
The brightness of an LED indicator changes
with the volume of the input voice signal.
Power on initial
The HT8950 enters the Robot state right after
power is initially switched on.
Robot state
The system goes into the Robot state after the
ROB pin is triggered or power is turned on. In
this mode, an input voice can be converted into
a robot voice.
Vibrato
An output voice will be generated with a vibrato
effect when the VIB pin is triggered, regardless
of what state the system is in. The vibrato effect
is toggle activated. In other words, when a voice
output is playing with a vibrato effect, this ef-
fect can be eliminated by retriggering the VIB
pin. The rate of vibrato effect can be changed by
adjusting the resistance of the external resistor
between the OSC2 and Fvil pins.
Voice modulation
The HT8950 provides an 8-bit A/D and a D/A
converters with a sampling rate of 8kHz, ensur-
ing a voice output of high quality and with a
high S/N ratio. The chip includes 7 steps to shift
the frequency of an input signal. The voice
modulation is selected and determined by the
SW0~SW2 inputs.
Input
SW2 SW1 SW0
Step Mode
Speed
Ratio
1
1
1
Controlled by TGU
and TDG
Notes
1 1 0 UP3
2
1 0 1 UP2
8/5
1 0 0 UP1
4/3
0 1 1 NORMAL
1
0 1 0 DN1
8/9
0 0 1 DN2
4/5
0 0 0 DN3
2/3
Notes: The TGU switch elevates by one step
mode, and the TGD switch, on the other hand,
falls one step mode step by step as shown:
• The system changes to the Robot state after
the ROB pin is triggered, regardless of what
state the system is in.
• A voice output is accompanied with a vibrato
effect after the VIB pin is triggered, regard-
less of what state the system is in.
LED indicator
The HT8950 provides a LAMP pin to drive an
external LED. The brightness of LED changes
with the volume of the input voice signal.
5 5th May ’98
5 Page 
18-pin version with a TDA2822 power amplifier and a 6V power supply
HT8950
11 5th May ’98
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HT8950.PDF ] | |
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