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參數(shù)資料
| 型號： | HM9270D |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | DTMF RECEIVER |
| 中文描述： | 雙音多頻接收器 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 66K |
| 代理商： | HM9270D |
DTMF RECEIVER
HM 9270C/D
- 2 -
Block Diagram (Figure 1)
Pin
Sym.
1
2
IN+
IN-
3
GS
4
V
REF
5
INH
6
PWDN
7
8
OSC1
OSC2
9
V
SS
10
TOE
Non-Inverting input
Invering Input
Gain select. Gives access to output of front-end differential amplifier for connection of
feedback resistor.
Reference voltage output,nominally V
DD
/2. May be used to bias the inputs at midrail (see
application diagram).
Inhibit (input) logic high inhibit the detection of 1633Hz internal built-in pull down resistor.
(HM9270D only).
Power down (input). Active high power down the device and inhibit the oscillator internal
built-in pull down resistor. (HM9270D only).
Clock Input
Output
Negative power supply, normally connected to 0V.
3-state data output enable (input). Logic high enables the outputs Q1-Q4. Internal pull-up.
Connections to the front-end differential amplifier.
Function
Pin Description
3.579545 MHz crystal connected between these pins compleClock
internal oscillator.
Q1
Q2
Q3
Q4
OSC1
OSC2
GS
IN
IN+
+
-
CHIP
CLOCKS
CHIP
POWER
CHIP
BIAS
CHIP
REF
DIAL
TONE
FILTER
HIGH
GROUP
FILTER
LOW
GROUP
FILTER
BIAS
CIRCUIT
+
-
ZERO
CROSSING
DETECTORS
DIGITAL
DETECTION
ALGORITHM
CODE
CONVERTER
AND
LATCH
STEERING
LOGIC
TOE
StD
V
DD
V
SS
V
REF
St/
GT
ESt
INH
PWDN
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