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PDF UPD7759 Data sheet ( Hoja de datos )
| Número de pieza | UPD7759 | |
| Descripción | ADPCM SPEECH SYNTHESIZER LSIs | |
| Fabricantes | NEC | |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µ PD7759
ADPCM SPEECH SYNTHESIZER LSIs
The µPD7759 is an external ROM type speech synthesis LSI employing the waveform coding
method. In addition to the ROM capability of up to 1 Mbit, the µPD7759 realizes the synthesis of
speech sounds of any length by using the ADPCM data transferred from an external ROM.
As the synthesizing method, it adopts the ADPCM method and the PCM + waveform element method.
The ADPCM method is suitable for synthesizing clear and natural speech sounds, and the PCM + waveform
element method is for the synthesis of sound effects and melodies. And by using them together, the
µPD7759 realizes the long-time synthesis of high-quality sounds.
Because of the short turn-around time of speech analysis, the µPD7759 can perform the quick system
development using a PROM, or the evaluation of an on-chip ROM type of the µPD7755 family.
FEATURES
5 q Synthesizing method
q Sampling frequency
q Bit rate (speech)
q Number of Messages
5 q External speech data ROM
: ADPCM, PCM + waveform element methods used together
: 5, 6 or 8 kHz
: 20 to 32 K bps
: 256 (MAX.)
Parameters
Products
µPD7759
Speech data ROM
(External)
1 Mbits
Synthesizing time
Speech (ADPCM) Note1
50 sec. (TYP.)
Melodies & sound effects Note2
(PCM + waveform element)
340 sec. (TYP.)
Note 1. The synthesizing time for the speech is the value for a 6 kHz sampling.
2. The synthesizing time for the melodies & sound effects is variable according to their tone.
q Speech output
q Host CPU interface
q Standby mode
q Supply voltage
q CMOS technology
: Current sink type analog output, 9-bit D/A converter
: Compatible with a 4/8-bit CPU
: Pop-noise preventive circuit incorporated
: 2.7 to 5.5 V
ORDERING INFORMATION
Part Number
Package
µPD7759C
40-pin plastic DIP (600 mil)
µPD7759GC-3BH
52-pin plastic QFP (s14 mm)
Quality grade
Standard
Standard
Please refer to "Quality grade on NEC Semiconductor Devices" (Document number IEI-1209) published by
NEC Corporation to know the specification of quality grade on the devices and its recommended applications.
Document No. IC-2323A
(O.D.No. IC-6960D)
Date Published January 1993
Printed in Japan
The information in this document is subject to change without notice.
The mark 5 shows revised points.
©
1988, 1993
1 page  
µPD7759
1.3 PIN FUNCTION FOR SLAVE MODE
Pin
(Abbre-
viation)
52-pin
QFP
Pin No.
40-pin
DIP
Pin No.
I/O
Function
I0 11 4
I1 12 5
I2 15 6
I3
16
7
Input
Invalid.
I4 17 8
Set at high or low level.
I5 18 9
I6 19 10
I7 21 11
AEN/WR
22
Output/
12
Input
Inputs write strobe signal for a speech synthesis data.
SAA
Invalid.
23 13 Output Leave this pin open.
ALE
Invalid.
25 15 Output Leave this pin open.
Slave mode selection input.
MD 34 21 Input Transition between two operation mode is not accepted
during synthesis or in the standby mode.
Invalid.
ST
35
22
Input
Set at high level.
Chip select signal input.
CS
38
25
Input
WR becomes valid when CS goes low.
A0 41 26
A1 42 27
A2 43 28
A3 44 29
A4 45 30 Output Invalid.
A5 47 31
Leave these pins open.
A6 48 32
A7 49 33
A8 50 34
ASD0 51 35
ASD1 2 36
ASD2 3 37
ASD3 4 38
Input Input speech synthesis data from an external source.
ASD4 5 39
ASD5
8
1
ASD6
9
2
ASD7
10
3
5
5 Page 
(2) MEMORY ACCESS
AEN
tAE
tMRO
tAEN
tEA
A0 to A8
ASD0 to ASD7
ALE
DRQ
tAC
tAL tLA
tLL
tLC
tDR tRDH
tDCC
µPD7759
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet UPD7759.PDF ] | |
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