HT8950A中文资料
HT8950/HT8950A Voice Modulator
Pin Assignment
Rev.1.101November 16,2006
Features
·Operating voltage:2.4V~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 ·Minimal external components ·HT8950:18-pin DIP package
HT8950A:16-pin DIP package
Applications
·Educational Toys/leisure products ·Mixers ·Recorders
·Audio system ·Speech system ·Telephone system
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,SW1and SW2for 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.
Block Diagram
Pad Coordinates Unit:m m
Pad No.X Y
Pad
No.
X Y
1-957.0720.510732.0-774.0
2-957.0423.511984.0-675.0
3-957.0210.012956.5-400.0
4-957.0-87.013956.5374.5
5-957.0-299.514956.5671.5
6-957.0-596.515530.5765.5
7-962.0-815.016345.50765.5
8-161.5-747.517-33.50765.5
9200.5-747.518-287.50765.5
Chip size:2350′2080(m m)2
The IC substrate should be connected to VSS in the PCB layout artwork.
Pin Description(HT8950)
Pin No.Pin Name I/O
Internal
Connection
Description
1~3SW0~SW2I Pull-High Function setting pin(for electronic setting) 4VSS I?Negative power supply,ground
5AO O?Internal amplifier output
6AIN I?Internal amplifier input(inverted)
7VDD O?Positive power supply
8LAMP O
NMOS
Open Drain
Lamp output(the brightness changes with the voice volume)
Rev.1.102November16,2006
Pin No.Pin Name I/O
Internal
Connection
Description
9AUDIO O
PMOS
Open Drain
Audio output
10VREF I?Internal amplifier reference voltage
11TS I?For IC test only
12FVIB O?Vibrato frequency control
13OSC2O?Oscillator output
14OSC1I?Oscillator input
15VIB I Pull-High Switch to Vibrato mode(toggle)
16TGU I Pull-High Switch to Upward step mode
17TGD I Pull-High Switch to Downward step mode(internal pull-high)
18ROB I Pull-High Switch to Robot mode(internal pull-high)
Absolute Maximum Ratings
Supply Voltage...........................V SS-0.3V to V SS+4.5V Storage Temperature............................-50°C to125°C Input Voltage..............................V SS-0.3V to V DD+0.3V Operating Temperature...........................-20°C to70C Note:These are stress ratings only.Stresses exceeding the range specified under2Absolute Maximum Ratings2may 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.
Electrical Characteristics Ta=25°C
Symbol Parameter
Test Conditions
Min.Typ.Max.Unit V DD Conditions
V DD Operating Voltage?? 2.4 3.0 4.0V
I OP Operating Current3V No load,f OSC=640kHz? 2.010mA
V IN Input Signal3V???580mV
I LAMP Lamp Sink Current3V V OL=1.3V 5.09.5?mA
A V OPA Gain Value3V Open loop?2000?
I O Audio Output Voltage3V During silence?-1?mA
V IH High Input Voltage??0.7V DD??V
V IL Low Input Voltage????0.3V DD V
f OSC Oscillatin
g Frequency3V R OSC=47k W?512?kHz Rev.1.103November16,2006
Functional Description
The HT8950/HT8950A are single chip LSIs designed for voice modulation.These devices provide seven steps to shift the frequency of an input voice signal up and down. The chips are also equipped with two special effects;Vi-brato and Robot.
The HT8950/HT8950A include a built-in amplifier,8-bit A/D converter and current output type of8-bit D/A con-verter in addition to a built-in SRAM.The brightness of the LED indicator changes with the volume of the input voice signal.
Power on Initial
The HT8950/HT8950A enter 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 vi-brato effect,this effect 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 OSC2and FVIB pins.Voice Modulation
The HT8950/HT8950A provide an8-bit A/D and D/A converters with a sampling rate of8kHz,ensuring a high quality voice output and with a high S/N ratio.The chips include seven steps to shift the frequency of an input signal.The voice modulation is selected and deter-mined by the SW0~SW2inputs.
Input
Step Mode
Speed
Ratio SW2SW1SW0
111
Controlled by TGU and
TDG
Notes 110UP32
101UP28/5
100UP14/3
011NORMAL1
010DN18/9
001DN24/5
000DN32/3
Notes:The TGU switch increments by one step mode, and the TGD switch,on the other hand,decrements by 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 af-ter the VIB pin is triggered,regardless of what state the system is in.
LED Indicator
The HT8950/HT8950A provide a LAMP pin to drive an external LED.The brightness of the LED changes with the volume of the input voice signal.
Rev.1.104November16,2006
Application Circuits
HT8950with HT82V733Power Amplifier and a6V Power Supply
HT8950A with HT82V733Power Amplifier and a6V Power Supply
Rev.1.105November16,2006
HT8950A with a Transistor Output Stage and a6V Power Supply
Rev.1.106November16,2006
HT8950A with HT82V733Power Amplifier and a6V Power Supply
Rev.1.107November16,2006
Package Information
16-pin DIP(300mil)Outline Dimensions
Symbol
Dimensions in mil
Min.Nom.Max.
A745?775
B240?260
C125?135
D125?145
E16?20
F50?70
G?100?
H295?315
I335?375
a0°?15°
Rev.1.108November16,2006
18-pin DIP(300mil)Outline Dimensions
Symbol
Dimensions in mil
Min.Nom.Max.
A895?915
B240?260
C125?135
D125?145
E16?20
F50?70
G?100?
H295?315
I335?375
a0°?15°
Rev.1.109November16,2006
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Copyright2006by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication.However,Holtek as-sumes no responsibility arising from the use of the specifications described.The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification,nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise.Holtek s products are not authorized for use as critical components in life support devices or systems.Holtek reserves the right to alter its products without prior notification.For the most up-to-date information, please visit our web site at https://www.wendangku.net/doc/3d11869890.html,.
Rev.1.1010November16,2006