HM9270D Ver la hoja de datos (PDF) - ELAN Microelectronics
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HM9270D Datasheet PDF : 10 Pages
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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-
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