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HT8950 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 · Few external components required · 16-pin/18-pin DIP package
Applications
· Toys · Mixers · Recorders · Audio system · Speech system · Telephone system
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 dramatic 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.
Pin Assignment
S W 0 O S C 1 1 2 3 4 5 6 7 8 H T 8 9 5 0 1 6 D IP -A V IB T G U T G D R O B V S S N C A O 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 O S C 2 F V IB T S V R E F A U D IO L A M P V D D A IN S W 1 S W 2 V S S A O A IN V D D L A M P A U D IO 9 8 7 6 5 4 3 2 1 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 H T 8 9 5 0 1 8 D IP -A R O B T G D T G U V IB O S C 1 O S C 2 F V IB T S V R E F
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HT8950
Block Diagram
T G U T G D V IB R O B
O S C 1 O S C 2 F V IB A O 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
P o w e r O n C ir c u it
S W 0 S W 1 S W 2 S R A M L a tc h D /A C o n v e rte r A U D IO V S S V D D T S L A M P
V R E F A /D C o n v e rte r
Pad Coordinates
Pad No.
1 4 T S
Unit: mm 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
O S C 1 O S C 2 F V IB
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
V IB 1 8 1
T G U
1 7
1 6
1 5
1 2 3 4 5 6 7 8 9
T G D R O B 3
2
1 3
V R E F
S W 0 4 5 S W 1
( 0 ,0 )
1 2 6 1 1
A U D IO L A M P
S W 2 V S S 7
8 A O
9 A IN
1 0 V D D
Chip size: 2350´2080 (mm)2 * The IC substrate should be connected to VSS in the PCB layout artwork.
Pin Description (18 Pin Version)
Pin No. 1 2 3 4 5 6 7 Pin Name SW0 SW1 SW2 VSS AO AIN VDD I/O I I I I O I O Internal Connection Pull-High Pull-High Pull-High ¾ ¾ ¾ ¾ Description Function setting pin (for electronic setting) Function setting pin (for electronic setting) Function setting pin (for electronic setting) Negative power supply, ground Internal amplifier output Internal amplifier input (inverted) Positive power supply
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HT8950
Pin No. 8 9 10 11 12 13 14 15 16 17 18 Pin Name LAMP AUDIO VREF TS FVIB OSC2 OSC1 VIB TGU TGD ROB I/O O O I I O O I I I I I Internal Connection NMOS Open Drain PMOS Open Drain ¾ ¾ ¾ ¾ ¾ Pull-High Pull-High Pull-High Pull-High Description Lamp output (brightness changes with voice volume) 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)
Absolute Maximum Ratings
Supply Voltage ..............................VSS-0.3V to VSS+6V Input Voltage..............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50°C to 125°C Operating Temperature...........................-20°C to 70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 ¾ 3V 3V 3V 3V 3V ¾ ¾ 3V VOL=1.3V Open loop During silence ¾ ¾ ROSC=47kW Conditions ¾ No load, fOSC=640kHz ¾ 2.4 ¾ ¾ 5.0 ¾ ¾ 0.7VDD ¾ ¾ 3.0 2.0 ¾ 9.5 2000 -1 ¾ ¾ 512 4.0 10 580 ¾ ¾ ¾ ¾ 0.3VDD ¾ Min. Typ. Max.
Ta=25°C Unit V mA mV mA
mA V V kHz
Rev. 1.00
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May 5, 1998
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 effects; 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 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. 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 Voice Modulation The HT8950 provides an 8-bit A/D and a D/A converters with a sampling rate of 8kHz, ensuring 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
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 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 af-
ter the VIB pin is triggered, regardless 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.
T G U * T G U D N 3 T G D T G D T G U D N 2 T G D T G U D N 1 T G D T G D T G U N O R M A L T G D T G U U P 1 T G D T G U U P 2 T G D T G U U P 3
R O B O T
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HT8950
Application Circuits
16-Pin Version with an LM386 Power Amplifier and a 6V Power Supply
1 0 0 k W 4 7 k W 1 2 3 4 5 6 7 8 O S C 1 V IB T G U T G D R O B V S S N C A O 0 6 & ' # ) 3 3 k W M IC 0 .1 m F O S C 2 F V IB T S V R E F A U D IO L A M P V D D A IN 9 4 7 0 W 4 .7 k W 4 .7 k W 2 2 m F /1 0 V 1 6 1 5 1 4 1 3 1 2 1 1 1 0 0 .1 m F 2 0 0 W 2 3 3 0 W 0 .1 m F 3 4 2 W 0 .1 m F S P K 6 L M 3 8 6 5 1 0 0 m F /1 0 V 4 .7 m F /1 0 V 3 .6 V 3 3 0 W 0 .1 m F 1 0 0 m F /1 0 V V C C 6 V
18-Pin Version with an LM386 Power Amplifier and a 6V Power Supply
1 2 3 4 3 3 W 5 6 7 4 .7 k W 8 4 7 0 W 0 .1 m F 4 .7 k W M IC 3 3 0 W 2 2 m F /1 0 V 0 .1 m F 2 0 0 W 2 .4 k W 9 S W 0 S W 1 S W 2 V S S A O A IN V D D L A M P A U D IO 0 6 & ' # R O B T G D T G U V IB O S C 1 O S C 2 F V IB T S V R E F 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 4 .7 m F /1 0 V 0 .1 m F 3 2 6 3 8 6 4 5 2 W 0 .1 m F 1 0 0 m F /1 0 V 4 7 k W 1 0 0 k W 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V 4 7 0 W V C C 6 V
S P K
Rev. 1.00
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May 5, 1998
HT8950
16-Pin Version with a Transistor Output Stage and a 6V Power Supply
1 0 0 k W 4 7 k W 1 2 3 4 5 6 7 8 O S C 1 V IB T G U T G D R O B V S S N C A O 0 6 & ' # ) 3 3 k W M IC 0 .1 m F O S C 2 F V IB T S V R E F A U D IO L A M P V D D A IN 9 4 7 0 W 4 .7 k W 4 .7 k W 2 2 m F /1 0 V 4 7 0 W 6 8 W 8 0 5 0 1 6 1 5 1 4 1 3 1 2 1 1 1 0 0 .1 m F 2 0 0 W 1 5 0 k W 3 3 0 W 2 .4 k W A 7 3 3 8 0 5 0 1 0 0 m F /1 0 V 4 .7 m F /1 0 V 3 .6 V 0 .1 m F 4 7 0 W 1 0 0 m F /1 0 V V C C 6 V
S P K
18-Pin Version with a Transistor Output Stage and a 6V Power Supply
1 2 3 4 3 3 W 5 6 7 4 .7 k W 8 4 7 0 W 0 .1 m F 4 .7 k W M IC 3 3 0 W 2 2 m F /1 0 V 0 .1 m F 2 0 0 W 2 .4 k W 9 S W 0 S W 1 S W 2 V S S A O A IN V D D L A M P A U D IO 0 6 & ' # R O B T G D T G U V IB O S C 1 O S C 2 F V IB T S V R E F 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 4 .7 m F /1 0 V 0 .1 m F 3 2 6 3 8 6 4 5 2 W 0 .1 m F 1 0 0 m F /1 0 V 4 7 k W 1 0 0 k W 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V 4 7 0 W V C C 6 V
S P K
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May 5, 1998
HT8950
16-Pin Version with a TDA2822 Power Amplifier and a 6V Power Supply
1 0 0 k W 4 7 k W 1 2 3 4 5 6 7 8 O S C 1 V IB T G U T G D R O B V S S N C A O O S C 2 F V IB T S V R E F A U D IO L A M P V D D A IN 9 4 7 k W 0 .1 m F 4 7 0 W 5 1 0 W 0 .0 3 3 m F 1 6 1 5 1 4 1 3 1 2 1 1 1 0 3 3 k W 1 0 k W 7 1 0 k W 6 4 8 2 2 m F /1 0 V 2
T D A 2 8 2 2
4 7 0 W 4 .7 m F /1 0 V 3 .6 V 0 .1 m F 1 0 0 m F /1 0 V
V C C 6 V
0 6 & ' # )
3 9 k W 0 .0 4 7 m F M IC
1
2 W 3 0 .1 m F
S P K
5
4 .7 k W 2 2 m F /1 0 V
0 .1 m F
18-Pin Version with a TDA2822 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 4 7 0 W 4 .7 k W M IC 2 2 m F /1 0 V 5 1 0 W 9 3 9 k W S W 0 S W 1 S W 2 V S S A O A IN V D D L A M P B A U D IO 3 3 k W 0 .0 3 3 m F 1 0 k W R O B T G D T G U V IB O S C 1 O S C 2 F V IB T S V R E F 0 6 & ' # 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 4 .7 m F /1 0 V 1 0 k W 6 4 8 2 2 m F /1 0 V 4 7 k W 1 0 0 k W 7
T D A 2 8 2 2
4 7 0 W
V C C 6 V 1 0 0 m F /1 0 V
3 .6 V
0 .1 m F
2
2 W 5 3 S P K 0 .1 m F 0 .1 m F
0 .1 m F
0 .1 m F
Rev. 1.00
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May 5, 1998
HT8950
Package Information
16-pin DIP (300mil) Outline Dimensions
) $ * ' &
0 + , . /
=
1
Symbol A B C D E F G H I a
Dimensions in mil Min. 745 240 125 125 16 50 ¾ 295 335 0° Nom. ¾ ¾ ¾ ¾ ¾ ¾ 100 ¾ ¾ ¾ Max. 775 260 135 145 20 70 ¾ 315 375 15°
Rev. 1.00
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May 5, 1998
HT8950
18-pin DIP (300mil) Outline Dimensions
) & * '
0 + , / .
=
1
Symbol A B C D E F G H I a
Dimensions in mil Min. 895 240 125 125 16 50 ¾ 295 335 0° Nom. ¾ ¾ ¾ ¾ ¾ ¾ 100 ¾ ¾ ¾ Max. 915 260 135 145 20 70 ¾ 315 375 15°
Rev. 1.00
9
May 5, 1998
HT8950
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. (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 (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor (Hong Kong) Ltd. Block A, 3/F, Tin On Industrial Building, 777-779 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holmate Semiconductor, Inc. 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright Ó 2003 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. 1.00
10
May 5, 1998