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HT8950/HT8950A Voice Modulator
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 frequency of an input voice, producing a dramatic change in the output. 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 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 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.
Pin Assignment
SW 0 SW 1 SW 2 VSS AO A IN VDD LAM P A U D IO 9 8 7 6 5 4 3 2 1 18 17 16 15 14 13 12 11 10 H T8950 1 8 D IP -A ROB TGD TGU V IB OSC1 OSC2 F V IB TS VREF OSC1 1 2 3 4 5 6 7 8 H T8950A 1 6 D IP -A V IB TGU TGD ROB VSS NC AO 16 15 14 13 12 11 10 9 OSC2 F V IB TS VREF A U D IO LAM P VDD A IN
Rev. 1.10
1
November 16, 2006
HT8950/HT8950A
Block Diagram
TGU TGD V IB ROB
OSC1 OSC2 F V IB AO A IN
O s c illa to r G e n e ra to r
T im e B a s e G e n e ra to r
C o n tro l C ir c u it
PowerO n C ir c u it
SW 0 SW 1 SW 2 SRAM L a tc h D /A C o n v e rte r A U D IO VSS VDD TS LAM P
VREF A /D C o n v e rte r
Pad Coordinates
OSC1 OSC2
Unit: mm Pad No.
14 TS
X -957.0 -957.0 -957.0 -957.0 -957.0 -957.0 -962.0 -161.5 200.5
Y 720.5 423.5 210.0 -87.0 -299.5 -596.5 -815.0 -747.5 -747.5
Pad No. 10 11 12 13 14 15 16 17 18
F V IB
V IB 18 1
X 732.0 984.0 956.5 956.5 956.5 530.5 345.50 -33.50 -287.50
Y -774.0 -675.0 -400.0 374.5 671.5 765.5 765.5 765.5 765.5
TGU
17
16
15
1 2 3 4 5 6
TGD ROB 3
2
13
VREF
SW 0 4 5 SW 1
( 0 ,0 )
12 6 11
A U D IO LAM P
7 8 9
SW 2 VSS 7
8 AO
9 A IN
10 VDD
Chip size: 23502080 (mm)2 The IC substrate should be connected to VSS in the PCB layout artwork.
Pin Description (HT8950)
Pin No. 1~3 4 5 6 7 8 Pin Name SW0~SW2 VSS AO AIN VDD LAMP I/O I I O I O O Internal Connection Pull-High 3/4 3/4 3/4 3/4 NMOS Open Drain Description Function setting pin (for electronic setting) Negative power supply, ground Internal amplifier output Internal amplifier input (inverted) Positive power supply Lamp output (the brightness changes with the voice volume)
Rev. 1.10
2
November 16, 2006
HT8950/HT8950A
Pin No. 9 10 11 12 13 14 15 16 17 18 Pin Name AUDIO VREF TS FVIB OSC2 OSC1 VIB TGU TGD ROB I/O O I I O O I I I I I Internal Connection PMOS Open Drain 3/4 3/4 3/4 3/4 3/4 Pull-High Pull-High Pull-High Pull-High Audio output Internal amplifier reference voltage For IC test only Vibrato frequency control Oscillator output Oscillator input Switch to Vibrato mode (toggle) Switch to Upward step mode Switch to Downward step mode (internal pull-high) Switch to Robot mode (internal pull-high) Description
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+4.5V Input Voltage..............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50C to 125C Operating Temperature...........................-20C to 70 C
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.
Electrical Characteristics
Test Conditions Symbol VDD IOP VIN ILAMP AV IO VIH VIL fOSC Parameter VDD Operating Voltage Operating Current Input Signal Lamp Sink Current OPA Gain Value Audio Output Voltage High Input Voltage Low Input Voltage Oscillating Frequency 3/4 3V 3V 3V 3V 3V 3/4 3/4 3V VOL=1.3V Open loop During silence 3/4 3/4 ROSC=47kW Conditions 3/4 No load, fOSC=640kHz 3/4 2.4 3/4 3/4 5.0 3/4 3/4 0.7VDD 3/4 3/4 3.0 2.0 3/4 9.5 2000 -1 3/4 3/4 512 4.0 10 580 3/4 3/4 3/4 3/4 0.3VDD 3/4 Min. Typ. Max.
Ta=25C Unit V mA mV mA
mA V V kHz
Rev. 1.10
3
November 16, 2006
HT8950/HT8950A
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; Vibrato and Robot. The HT8950/HT8950A include 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 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 vibrato 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 OSC2 and FVIB pins. Voice Modulation The HT8950/HT8950A provide an 8-bit A/D and D/A converters with a sampling rate of 8kHz, 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 determined by the SW0~SW2 inputs. Input Step Mode SW2 SW1 SW0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 Speed Ratio
Controlled by TGU and Notes TDG UP3 UP2 UP1 NORMAL DN1 DN2 DN3 2 8/5 4/3 1 8/9 4/5 2/3
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.
TGU * ROBOT TGU DN3 TGD TGD TGU DN2 TGD TGU DN1 TGD TGD TGU NORMAL TGD TGU UP1 TGD TGU UP2 TGD TGU UP3
Rev. 1.10
4
November 16, 2006
HT8950/HT8950A
Application Circuits
HT8950 with HT82V733 Power Amplifier and a 6V Power Supply
1 2 3 4 33kW 5 6 7 4 .7 k W 8 470W 0 .1 m F 4 .7 k W M IC 2 2 m F /1 0 V 510W 0 .0 3 3 m F 33kW 0 .1 m F 50kW 1mF 3 9 SW 0 SW 1 SW 2 VSS AO A IN VDD LAM P A U D IO H T8950 ROB TGD TGU V IB OSC1 OSC2 F V IB TS VREF 18 17 16 15 14 13 12 11 10 4 .7 m F /1 0 V 2 8 VDD A u d io In 47kW 100kW 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V 470W VCC 4 .5 V
VSS
4 5 1
47mF
CE H T82V733 VREF OUTN NC OUTP 6 7
SPK
HT8950A with HT82V733 Power Amplifier and a 6V Power Supply
100kW 47kW 1 2 3 4 5 6 7 8 OSC1 V IB TGU TGD ROB VSS NC AO H T8950A 33kW M IC 0 .1 m F OSC2 F V IB TS VREF A U D IO LAM P VDD A IN 9 470W 4 .7 k W 4 .7 k W 2 2 m F /1 0 V 1mF 16 15 14 13 12 11 10 510W 0 .0 3 3 m F 33kW 0 .1 m F 2 3 50kW 4 .7 m F /1 0 V 3 .6 V 330W 0 .1 m F 100mF/ 10V VCC 4 .5 V
8 VDD A u d io In
VSS
4 5 1
47mF
CE H T82V733 VREF OUTN NC OUTP 6 7
SPK
Rev. 1.10
5
November 16, 2006
HT8950/HT8950A
HT8950 with a Transistor Output Stage and a 6V Power Supply
1 2 3 4 33kW 5 6 7 4 .7 k W 8 470W 0 .1 m F 4 .7 k W M IC 330W 2 2 m F /1 0 V 0 .1 m F 200W 2 .4 k W 9 SW 0 SW 1 SW 2 VSS AO A IN VDD LAM P A U D IO ROB TGD TGU V IB OSC1 OSC2 F V IB TS VREF H T8950 18 17 16 15 14 13 12 11 10 4 .7 m F /1 0 V 470W 47kW 100kW 150W 68W 8050 SPK 0 .1 m F A733 8050 1 0 0 m F /1 0 V 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V 470W VCC 6V
HT8950A with a Transistor Output Stage and a 6V Power Supply
100kW 47kW 1 2 3 4 5 6 7 8 OSC1 V IB TGU TGD ROB VSS NC AO H T8950A 33kW M IC 0 .1 m F OSC2 F V IB TS VREF A U D IO LAM P VDD A IN 9 470W 4 .7 k W 4 .7 k W 2 2 m F /1 0 V 470W 68W 8050 16 15 14 13 12 11 10 0 .1 m F 200W 150kW 330W 2 .4 k W A733 8050 1 0 0 m F /1 0 V 4 .7 m F /1 0 V 3 .6 V 0 .1 m F 470W 1 0 0 m F /1 0 V VCC 6V
SPK
Rev. 1.10
6
November 16, 2006
HT8950/HT8950A
HT8950 with HT82V733 Power Amplifier and a 6V Power Supply
1 2 3 4 0 .0 4 7 m F 5 6 7 4 .7 k W 8 470W 4 .7 k W M IC 2 2 m F /1 0 V 510W 9 39kW SW 0 SW 1 SW 2 VSS AO A IN VDD LAM PB A U D IO 33kW 0 .0 3 3 m F 50kW ROB TGD TGU V IB OSC1 OSC2 F V IB TS VREF H T8950 18 17 16 15 14 13 12 11 10 2 4 .7 m F / 10V 3 1mF 0 .1 m F 47kW 100kW 8 VDD A u d io In 47mF 4 5 1 SPK 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V 470W VCC 4 .5 V
0 .1 m F
VSS
CE H T82V733 VREF OUTN NC OUTP 6 7
HT8950A with HT82V733 Power Amplifier and a 6V Power Supply
100kW 47kW 1 2 3 4 5 6 7 8 OSC1 V IB TGU TGD ROB VSS NC AO OSC2 F V IB TS VREF A U D IO LAM P VDD A IN 9 47kW 0 .1 m F 470W 510W 0 .0 3 3 m F 3 4 .7 k W 2 2 m F /1 0 V 1mF 16 15 14 13 12 11 10 33kW 50kW 0 .1 m F 2 8 VDD A u d io In 4 .7 m F /1 0 V 3 .6 V 470W 0 .1 m F 1 0 0 m F /1 0 V VCC 4 .5 V
VSS
5 1
4
47mF
H T8950A
39kW 0 .0 4 7 m F M IC
CE H T82V733 VREF OUTN NC OUTP 6 7
SPK
Rev. 1.10
7
November 16, 2006
HT8950/HT8950A
Package Information
16-pin DIP (300mil) Outline Dimensions
A 16 B 1 9 8
H C D E F G
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 745 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 775 260 135 145 20 70 3/4 315 375 15
Rev. 1.10
8
November 16, 2006
HT8950/HT8950A
18-pin DIP (300mil) Outline Dimensions
A 18 B 1 10 9
H C D E G F
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 895 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 915 260 135 145 20 70 3/4 315 375 15
Rev. 1.10
9
November 16, 2006
HT8950/HT8950A
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 86-21-6485-5560 Fax: 86-21-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9533 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holmate Semiconductor, Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holmate.com
Copyright
2006 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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 http://www.holtek.com.tw.
Rev. 1.10
10
November 16, 2006

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