MT8880CE1 Zarlink, MT8880CE1 Datasheet - Page 8

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MT8880CE1

Manufacturer Part Number
MT8880CE1
Description
DTMF TXRX 3.58MHz CMOS 5V 20-Pin PDIP Tube
Manufacturer
Zarlink
Datasheet

Specifications of MT8880CE1

Package
20PDIP
Operating Frequency
3.58 MHz
Typical Supply Current
11 mA
Typical Operating Supply Voltage
5 V
Minimum Operating Supply Voltage
4.75 V
Maximum Operating Supply Voltage
5.25 V

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MT8880CE1
Manufacturer:
Zarlink
Quantity:
2
Part Number:
MT8880CE1
Manufacturer:
ZARLINK
Quantity:
20 000
The period of each tone consists of 32 equal time segments. The period of a tone is controlled by varying the length
of these time segments. During write operations to the Transmit Data Register the 4 bit data on the bus is latched
and converted to 2 of 8 coding for use by the programmable divider circuitry. This code is used to specify a time
segment length which will ultimately determine the frequency of the tone. When the divider reaches the appropriate
count, as determined by the input code, a reset pulse is issued and the counter starts again. The number of time
segments is fixed at 32, however, by varying the segment length as described above the tone output signal
frequency will be varied. The divider output clocks another counter which addresses the sinewave lookup ROM.
V
ESt
St/GT
RX
b3
b2
Read
Status
Register
IRQ/CP
in
EVENTS
0
-RX
3
t
REC
DECODED TONE # (n-1)
A
LEVEL
(dBm)
-25
Figure 9 - Receiver Timing Diagram
t
0
Figure 8 - Call Progress Response
DP
= Reject
= May Accept
= Accept
Zarlink Semiconductor Inc.
t
REC
TONE #n
MT8880C
250
B
FREQUENCY (Hz)
t
GTP
8
t
PStRX
t
PStb3
t
500
ID
# n
C
t
DA
t
GTA
TONE
#n + 1
D
750
t
DO
E
TONE
#n + 1
# (n + 1)
Data Sheet
F
V
TSt

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