DTMF Receiver LSI
Overview
The LC73861 and LC73862 are DTMF signal detector receiver
that incorporates all the necessary filters for telephone
answering machines.
Features
.
16-DTMF tone signal decoder
.
DTMF receiver with all necessary filters built-in
.
Dial tone filter
.
High-group bandpass filter
.
Low-group bandpass filter
.
Extended dynamic range
.
Serial data output
.
Microcontroller guard-time compatible
.
4.5 to 5.5 V operating supply voltage range
Package Dimensions
unit : mm
3001B-DIP8
[LC73861, LC73862]
SANYO : DIP8
Specifications
Absolute Maximum Ratings
at Ta = 25C, V
SS
= 0 V
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
DD
max
0.3 to +6.0
V
Maximum input voltage
V
IN
max
0.3 to V
DD
+0.3
V
Maximum input current
I
IN
max
10 to +10
mA
Maximum output voltage
V
OUT
max
0.3 to V
DD
+0.3
V
Allowable power dissipation
Pd max
Ta
%
85C
500
mW
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
50 to +125
C
Allowable Operating Conditions
at Ta = 40C to +85C, V
SS
= 0 V
Parameter
Symbol
Conditions
min
typ
max
Unit
Operating supply voltage
V
DD
4.5
5.5
V
High-level input voltage
V
IH
ACK pin
0.7V
DD
V
Low-level input voltage
V
IL
ACK pin
0.3V
DD
V
DC Electrical Characteristics
at Ta = 25C
2C, V
DD
= 5 V, V
SS
= 0 V
Parameter
Symbol
Conditions
min
typ
max
Unit
Operating supply current
I
DD
(op)
3
7
mA
High-level output current
I
OH
V
OUT
= 4.6 V, SD and EST pins
0.4
mA
Low-level output current
I
OL
V
OUT
= 0.4 V, SD and EST pins
1
mA
Input impedance
Zin
INPUT pin
10
k
Ordering number: EN4431A
CMOS LSI
LC73861, LC73862
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA(II)/90793JN B8-0375 No.4431-1/5
AC Electrical Characteristics
at Ta = 25C
2C, V
DD
= 5 V, V
SS
= 0 V, f
OSC
= 4.194304 MHz
Parameter
Symbol
Conditions
min
typ
max
Unit
Valid input signal level
See notes 1, 2, 3, 5, 6 and 9.
49.5
0
dBm
Positive twist accept
See notes 2, 3, 4, 9 and 11.
6
dB
Frequency deviation accept
See notes 2, 3, 5 and 9.
1.5%
2
Hz
Frequency deviation reject
See notes 2, 3 and 5.
3.5
%
Third tone tolerance
See notes 2, 3, 4, 5, 9 and 10.
16
dB
Dial tone tolerance
See notes 2, 3, 4, 5, 8, 9 and 10.
22
dB
Noise tolerance
See notes 2, 3, 4, 5, 7, 9 and 10.
12
dB
Tone present detect time
t
DP
See Timing Chart.
3
20
ms
Tone absent detect time
t
DA
See Timing Chart.
0.5
20
ms
Data shift rate
1
MHz
Data output delay time
t
PAD
See Timing Chart.
100
ns
Setup time delay
t
DL
See Timing Chart.
0
ns
Data hold time
t
DH
See Timing Chart.
30
ns
Oscillator frequency
f
OSC
LC73861
4.190109 4.194304 4.198498
MHz
LC73862
3.5759
3.5795
3.5831
MHz
Load capacitance
C
XO
OSCI and OSCO
30
pF
Notes
1.
0 dBm = 1 mW power when driving a 600
load.
2.
All 16 DTMF signal frequencies.
3.
40 ms DTMF signal period and 40 ms pause period.
4.
Nominal DTMF frequency.
5.
Low-frequency group and High-frequency group signal levels are the same.
6.
DTMF signal frequency deviation is within
1.5%
2 Hz.
7.
Bandwidth limited (0 to 3 kHz) Gaussian noise.
8.
350 Hz and 440 Hz dial tone frequencies.
9.
Error rate of less than 1 in 10,000.
10. Referenced to the lowest frequency component of the DTMF signal.
11. Twist = High-frequency group tone level
Low-frequency group tone level.
Pin Assignment
Pin Description
Number
Name
I/O
Description
1
INPUT
I
Input coupling capacitor required. Biased internally to V
DD
/2.
2
OSCO
O
An oscillating circuit is formed by connecting a 4.194304 MHz (LC73861) / 3.579545 MHz (LC73826)
oscillator and a capacitor (if needed) between these pins. (To determine whether an external
capacitor is needed or not, contact the manufacturer of the oscillator.)
3
OSCI
I
4
V
SS
Supply pin, normally 0 V
5
SD
O
Outputs 4-bit serial decoded DTMF output, least significant bit first.
6
ACK
I
The ACK pin is used to shift out data to the SD pin. Four pulses are needed in order to shift out the
4-bit DTMF code. The data is latched by the shift register before the rising edge of the first pulse.
7
EST
O
Indicates the presence of a DTMF signal when HIGH. (This pin can be monitored and after a short
delay, data can be accessed by 4 pulses to ACK.)
8
V
DD
O
Supply pin, normally 4.5 V to 5.5 V
Top view
LC73861, LC73862
No.4431-2/5
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of September, 1997. Specifications and information herein are subject to change without notice.
LC73861, LC73862
No.4431-5/5
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