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PDF HM9270C Data sheet ( Hoja de datos )
| Número de pieza | HM9270C | |
| Descripción | DTMF RECEIVER | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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HM 9270C/D
DTMF RECEIVER
General Description
The HM 9270C/D is a complete DTMF receiver integrating both the bandsplit filter and digital decoder
functions. The filter section uses switched capacitor techniques for high- and low-group filters and dial-tone
rejection. Digital counting techniques are employed in the decoder to detect and decode all 16 DTMF tone-
pairs into a 4-bit code. External component count is minimized by on-chip provision of a differential input
amplifier, clock-oscillator and latched 3-state bus interface.
Features
• Complete receiver in an 18-pin package.
• Excellent performance.
• CMOS, single 5 volt operation.
• Minimum board area.
• Central office quality.
• Low power consumption.
• Power-Down mode (HM9270D only).
• Inhibit-mode (HM9270D only).
Pin Configurations
HM9270C
IN+
IN
GS
VREF
IC*
IC*
OSC1
OSC2
VSS
1
2
3
4
5
6
7
8
9
18 VDD
17 St/GT
16 ESt
15 StD
14 Q4
13 Q3
12 Q2
11 Q1
10 TOE
HM9270D
IN+
IN
GS
VREF
INH
PWDN
OSC1
OSC2
VSS
1
2
3
4
5
6
7
8
9
18 VDD
17 St/GT
16 ESt
15 StD
14 Q4
13 Q3
12 Q2
11 Q1
10 TOE
* Connect to V
SS
-1-
1 page  
HM 9270C/D
DTMF RECEIVER
Parameter Description
Min. Typ. Max. Units Notes
TIMING:
tDP
tDA
t
REC
t
REC
t
ID
t
DO
Tone Present Detection Time
Tone Absent Detection Time
Tone Duration Accept
Tone Duration Reject
Interdigit Pause Accept
Interdigit Pause Reject
5 14
0.5 4
20
ms
16 ms
8.5 ms
40 ms
ms
40 ms
Adjustment"
Refer to Fig. 4
(User Adjustable)
Refer to "Guard Time 20
OUTPUTS:
t
PQ
t
PSED
t
QSED
t
PTE
tPTD
Propagation Delay (St to Q)
Propagation Delay (St to StD)
Output Data Set Up (Q to Std)
Propagation
ENABLE
Delay (TOE to Q) DISABLE
8 11 µs
12 µs
4.5 µs
50 60 ns
300 ns
TOE= VDD
RL=10kΩ
C =50pf
L
CLOCK:
f
CLK
C
LO
Crystal/Clock Frequency
Clock Output Capacitive
(OSC2)
Load
3.5759 3.5795 3.581 MHz
30 pf
Notes: 1.dBm = decibels above or below a reference power of 1mW into a 600 Ohm load.
2.Digit sequences consists of all 16 DTMF tones.
3.Tone duration = 40mS Tone pause = 40mS.
4.Nominal DTMF frequencies are used.
5.Both tones in the composite signal have an equal amplitude.
6.Tone pair is deviated by ±1.5% ±2Hz.
7.Bandwidth limited (3kHz) Gaussian Noise.
8.The precise dial tone frequencies are (350Hz and 440Hz) ±2%.
9.For an error rate of less than 1 in 10,000.
10.Referenced to the lowest level frequency component in DTMF signal.
11.Added A 0.1µf capacitor between VDD and VSS.
Function Description
5V
100 NF
100 KΩ
100 KΩ
3.58
MHz
HM9270C
IN+
IN
GS
VREF
IC
IC
OSC1
OSC2
VSS
0.1µf
VDD
St/GT
ESt
StD
Q4
Q3
Q2
Q1
TOE
100 NF
300 KΩ
FIGURE 2. SINGLE ENDED INPUT CONFIGURATION
-5-
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HM9270C.PDF ] | |
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