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參數(shù)資料
| 型號： | UPD7759C |
| 廠商： | NEC Corp. |
| 英文描述： | ADPCM SPEECH SYNTHESIZER LSIs |
| 中文描述： | 差分PcM語音合成器大規(guī)模集成電路 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 183K |
| 代理商： | UPD7759C |
μ
PD7759
3
1. PIN FUNCTIONS
1.1 COMMON FUNCTION TO ALL MODES
Pin
(Abbre-
viation)
52-pin
QFP
Pin No.
40-pin
DIP
Pin No.
I/O
Function
V
DD
6
40
—
Power supply (2.7 to 5.5 V)
DRQ
24
14
Output
Speech synthesis data request.
D/A converter reference current input.
The sink-load current input causes the output current of the
D/A converter to change.
The D/A converter reference current is passed to V
DD
via
a resistor.
In standby mode, REF is set to high impedance.
Analog speech signal output.
AVO outputs a unipolar sink-load current.
The output current is reduced to 0 when the
μ
PD7759 is in the
standby mode.
The output current of the D/A converter from AVO is changed
according to the input current from REF.
Maximum output current of the D/A converter is approx. the
34 times the REF input current.
Active-low BUSY signal output. When inputting ST signal,
it outputs a low level signal.
MD, ST and WR are invalid while BUSY is low.
In standby mode, BUSY is set to high impedance.
Reset input.
In standby mode, RESET must be at low level more than 12
clock cycles after clock oscillation becomes stable.
In operation mode, RESET must be at low level for 12 clock
cycles (oscillation clock).
RESET
31
19
Input
GND
32
20
—
Ground.
Ceramic resonator connection for generating a clock signal.
The 640 kHz ceramic resonator can be connected.
In standby mode, the
μ
PD7759 outputs a low-level to X1 and
a high-level to X2.
1, 7, 13,
14, 20, 26,
27, 33, 39,
40, 46, 52
X1
36
23
—
X2
37
24
—
REF
28
16
Input
AVO
29
17
Output
BUSY
30
18
Output
NC
—
—
No Connection
#
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