MT88E45BSR1 Zarlink, MT88E45BSR1 Datasheet - Page 24

• Manufacturer Part Number: MT88E45BSR1
• Description: Caller ID CMOS 3.58MHz 3.3V 20-Pin SOIC T/R
• Manufacturer: Zarlink

Specifications of MT88E45BSR1

• Package: 20SOIC
• Telecommunication Standards Supported: ANSI/TIA/EIA-716|ETSI/ETS 300 778-1|GR-30|SIN227|SIN242|SR-TSV-002476|TIA/EIA-777
• Fabrication Technology: CMOS
• Maximum Data Rate: 1212 Bd
• Typical Operating Supply Voltage: 3.3 V
• Typical Supply Current: 2.8 mA
• Minimum Operating Temperature: -40 °C
• Maximum Operating Temperature: 85 °C
• Operating Frequency: 3.58 MHz

Advance Information
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
2) Non-FSK signals such as CAS, speech and DTMF tones are in the same frequency band as FSK. They will be demodulated and
3) The MT88E45 may be put into FSK mode as soon as the CPE has finished sending the acknowledgment signal ACK. TR-NWT-
4) The MT88E45 should be taken out of FSK mode when CD has become inactive, or after 5 framing errors have been detected, or
5) In an unsuccessful attempt where the end office does not send the FSK signal, the CPE should unmute the handset and enable the
6) The total recognition time is t
7) The total tone absent time is t
8) PWDN, Hybrid CASen and FSKen are internal signals decoded from CB0/1/2.
9) This signal represents the mode of the DR/STD pin.
Hybrid CASen
use battery power while on-hook. The CPE must also be CID (on-hook) capable because a CIDCW CPE includes CID functionality.
give false data. Therefore the MT88E45 should be taken out of FSK mode when FSK is not expected.
000575 specifies that ACK = DTMF ‘D’ for non-ADSI CPE, ‘A’ for ADSI CPE.
after 150ms of continuous mark signal or space signal has been received. The framing errors need not be consecutive.
keypad after interval D has expired.
is the comparator threshold (refer to Figure 5 for details).
is the comparator threshold (refer to Figure 5 for details).
TIP/RING
PWDN
Note 8
FSKen
Note 8
Note 8
OSC2
Note 9
DCLK
ST/GT
Note 9
DATA
STD
EST
Figure 16 - Application Timing for Bellcore Off-hook Data Transmission, e.g., CIDCW
CD
DR
Note 1
CPE goes off-hook
Note 2
t
t
REC
DP
t
t
PU
GP
REC
ABS
Note 6
= t
CAS
= t
A
GP
GA
+ t
Note 7
+ t
DP
DA
, where t
, where t
CPE mutes handset & disables keypad
t
B
t
ABS
V
DA
TGt
t
GA
GP
CPE sends
GA
is the tone present guard time and t
ACK
is the tone absent guard time and t
C
Note 3
Note 5
t
CP
D
Mark
E
Data
Data
DP
DA
F
is the tone present detect time. V
is the tone absent detect time. V
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
t
CA
50ms
MT88E45
TGt
TGt
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