HT8950 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – Voice Modulator

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