MT88E46AS1 Zarlink, MT88E46AS1 Datasheet - Page 21

• Manufacturer Part Number: MT88E46AS1
• Description: Caller ID CMOS 3.58MHz 3.3V/5V 20-Pin SOIC Tube
• Manufacturer: Zarlink

Specifications of MT88E46AS1

• Package: 20SOIC
• Telecommunication Standards Supported: Bellcore GR-30-CORE|SR-TSV-002476|TIA/EIA-716|TIA/EIA-777
• Fabrication Technology: CMOS
• Maximum Data Rate: 1.212 KBd
• Typical Operating Supply Voltage: 3.3|5 V
• Typical Supply Current: 4.3 mA
• Minimum Operating Temperature: -40 °C
• Maximum Operating Temperature: 85 °C
• Operating Frequency: 3.58 MHz

Data Sheet
Notes:
1) In a CPE where AC power is not available, the designer may choose to switch over to line power when the CPE goes off-hook and use battery
2) Non-FSK signals such as CAS, speech and DTMF tones are in the same frequency band as FSK. They will be demodulated and give false data.
3) If the CPE is the ACK-Sender, the MT88E46 may be put into FSK mode right after ACK has been sent. If the CPE is not the ACK-Sender, the
4) The MT88E46 should be taken out of FSK mode when CD has become inactive, or when more than 5 framing errors have been detected in the
5) In an unsuccessful attempt where the central office does not send the FSK signal, the CPE should unmute the handset and enable the keypad
6) PWDN, Off Hook CASen and FSKen are internal signals decoded from CB0/1/2.
7) The DR/DET output pin is the DET signal when CAS detection is selected, the DR signal when FSK is selected.
Off Hook CASen
(Note 7)
power while on-hook. The CPE must also be CID (on-hook) capable because a CIDCW CPE includes CID functionality.
Therefore the MT88E46 should be taken out of FSK mode when FSK is not expected.
MT88E46 should be put into FSK mode at 30 ms (min ACK delay) + 55 ms (min ACK duration) = 85 ms after the line HIGH transition. In that
case the FSK carrier detector may be activated by the ACK if both the ACK delay and the ACK duration are at maximum. TR-NWT-000575
specifies that ACK = DTMF ‘D’ for non-ADSI CPE, ‘A’ for ADSI CPE.
message, or when more than 150 ms of continuous Mark or Space has been detected.
after interval D has expired.
TIP/RING
PWDN
(Note 6)
(Note 6)
FSKen
OSC2
DET
(Note 7)
CD
DR
DCLK
DATA
(Note 6)
Note 1
Figure 17 - Application Timing: Bellcore Off-Hook Data Transmission, e.g. CIDCW
CPE goes off-hook
Note 2
t
PU
t
CAS
DET2
A
25ms
CPE mutes handset, disables keypad
B
t
DW
and performs MEI check (See TIA/EIA-777)
CPE sends
30-40ms
ACK
C
Note 3
Note 5
t
CP
D
Mark
E
Data
Data
F
CPE unmutes handset
and enables keypad
Note 4
G
A = 75-85ms
B = 0-100ms
C = 55-65ms
D = 0-500ms
E = 58-75ms
F = feature specific
G ≤ 50ms
t
CA
MT88E46
Speech
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