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HT8950, HT8955, HT8955A

Table of contents:
Info of HT8950
Info of HT8955
Info of HT8955A

HT8950, HT8955, HT8955A Selling Leads, Datasheet

MFG:DIP Package Cooled:HT D/C:1992

HT8950, HT8955, HT8955A Datasheet download

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Part Number: HT8950

MFG: DIP

Package Cooled: HT

D/C: 1992

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HT8950 General Description

The HT8950 is a single chip CMOS LSI voice modulator. It provides 7 steps to shift the frequency of an input voice, producing a dramatical change in the output.

The HT8950 provides 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 chip provides 7 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 includes 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 chip provides an LED indicator which flashes with the volume of the input voices. It is offered in a 16-pin or 18-pin DIP package.

HT8950 Maximum Ratings

Supply Voltage ...............................0.3V to 6V
Input Voltage................. V_SS0.3V to V_DD+0.3V
Storage Temperature.................50 to 125
Operating Temperature............... 20 to 70

*Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT8950 Features

· Operating voltage: 2.4~4.0V
· On-chip SRAM
· Robot function
· Vibrato function
· 8kHz sampling rate
· 7-step level shifting
· 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

HT8950 Typical Application

· Toys
· Mixers
· Recorders
· Audio system
· Speech system
· Telephone system

HT8950 Connection Diagram

HT8955A General Description

The HT8955A is a CMOS LSI digital audio signal delay processor. It is designed for audio system applications including echo generators, karaoke systems, sound effect generators, etc.

The chip consists of a built-in pre-amplifier, on-chip oscillator, DRAM interface, 10-bit A/D and D/A converters as well as control logic. It provides continuously adjustable delay time up to 0.8/0.2 seconds at a sampling rate of 25kHz when combined with an external DRAM (41256/4164). The HT8955A is superior to a conventional BBD delay unit in its low distortion, high S/N ratio and long delay time. Its sophisticated low pass filter will not end in the normal applications due to the high sampling rate (25~50kHz). Hence, the HT8955A is excellent for audio delay system applications. It is offered in a 24-pin dual-in-line package.

HT8955A Maximum Ratings

Supply Voltage ................................0.3V to 6V
Input Voltage................. V_SS0.3V to V_DD+0.3V
Storage Temperature................ 50 to 125
Operating Temperature............... 20 to 70

*Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT8955A Features

` Operating voltage: 5.0V
` Long delay time
0.8 seconds (SEL=VSS, 256K DRAM)
0.2 seconds (SEL=VDD/open, 64K DRAM)
` 25kHz sampling rate
` Continuous variable delay time
` Built-in pre-amplifier
` Low distortion
` High S/N ratio
` Wide frequency response
` PCM 10-bit A/D and D/A converters
` 24-pin DIP package

HT8955A Typical Application

· Mixers
· Karaoke systems
· Echo generators
· Sound effect generators

HT8955A Connection Diagram

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