MT8880CE1 Zarlink, MT8880CE1 Datasheet - Page 13

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

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

BIT
b0
b1
b2
b3
CP/DTMF
NAME
TOUT
RSEL
IRQ
INTERRUPT ENABLE
REGISTER SELECT
MODE CONTROL
TONE OUTPUT
FUNCTION
RSEL
C/R
b3
b3
Table 5 - Control Register A Description
Table 3 - CRA Bit Positions
Table 4 - CRB Bit Positions
S/D
IRQ
b2
b2
Zarlink Semiconductor Inc.
A logic ‘1’ enables the tone output. This function can be
implemented in either the burst mode or non-burst mode
In DTMF mode (logic ‘0’) the device is capable of generating and
receiving Dual Tone Multi-Frequency signals. When the CP (Call
Progress) mode is selected (logic ‘1’) a 6th order bandpass filter is
enabled to allow call progress tones to be detected. Call progress
tones which are within the specified bandwidth
presented
the IRQ bit has been enabled (b2=1). Also, when the CP mode and
BURST mode have both been selected, the transmitter will issue
DTMF signals with a burst and pause of 102 ms (typ) duration. This
signal duration is twice that obtained from the DTMF transmitter if
DTMF mode had been selected. Note that DTMF signals cannot be
decoded when the CP mode of operation has been selected.
A logic ‘1’ enables the INTERRUPT mode. When this mode is active
and the DTMF mode has been selected (b1=0) the IRQ/CP pin will
pull to a logic ‘0’ condition when either 1) a valid DTMF signal has
been received and has been present for the guard time duration or 2)
the transmitter is ready for more data (BURST mode only).
A logic ‘1’ selects Control Register B on the next Write cycle to the
Control Register address. Subsequent Write cycles to the Control
Register are directed back to Control Register A.
MT8880C
CP/DTMF
13
TEST
b1
b1
at
the IRQ/CP
DESCRIPTION
BURST
TOUT
b0
b0
pin
in rectangular wave format if
.
Data Sheet
will
be