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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 66K |
| 代理商： | HM9270D |
DTMF RECEIVER
HM 9270C/D
- 9 -
fLow Fhigh Key
697
1209
697
1336
697
1477
770
1209
770
1336
770
1477
852
1209
852
1336
852
1477
941
1336
941
1209
941
1477
697
1633
770
1633
852
1633
941
1633
-
-
TOE
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
Q4
L
L
L
L
L
L
L
H
H
H
H
H
Q3
L
L
L
H
H
H
H
L
L
L
L
H
Q2
L
H
H
L
L
H
H
L
L
H
H
L
Q1
H
L
H
L
H
L
H
L
H
L
H
L
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
D
ANY
Z
Z
Z
Z
Input Configuration
The input arrangement of the HM9270C/D provides a differential-input operational amplifier as well as a
bias source (V
) which is used to bias the inputs at mid-rail.
Provision is made for connection of a feedback resistor to the op-amp output (GS) for adjustment of gain.
In a single-ended configuration, the input pins are connected as shown in Fig. 2 with the op-amp connected
for unity gain and V
biasing the input at 1/2V
DD
.
Fig. 9 shows the differential configuration, which permits the adjustment of gain with the feedback resistor
R5.
FIGURE 9. DIFFERENTIAL INPUT CONFIGURATION
Power - down and inhibit mode
A logic high applied to pin 6 (PWDN) will power the device to minimize the power consumption in a standby
mode. It stops the oscillator and the functions of the filters.
Inhibit mode is enabled by a logic high input to the pin 5 (INH). It inhibits the detection of 1633 Hz. The output
code will remain the same as the previous detected code (see table 1).
fLow Fhigh Key
697
1209
697
1336
697
1477
770
1209
770
1336
770
1477
852
1209
852
1336
852
1477
941
1336
941
1209
941
1477
697
1633
770
1633
852
1633
941
1633
-
-
TOE
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
Q4
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
Z
Q3
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
Z
Q2
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
Z
Q1
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Z
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
D
ANY
PREVIOUS DATA
Table 1: Truth table
INH =V
SS
(Z: high impedance)
INH=V
DD
C1
R1
C2
R4
R5
GS
R2
R3
V
REF
+
-
HM9270C/D
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