MT88E46_06 Datasheet, PDF (1/23 Pages) Texas Instruments – Bellcore Compliant Calling Number Identification Circuit

MT88E46
Bellcore Compliant Calling Number
Identification Circuit
Data Sheet
Features
• Compatible with Bellcore GR-30-CORE, SR-
TSV-002476; TIA/EIA-716 and TIA/EIA-777
• Pin compatible with MT88E45
• Differential input amplifiers with adjustable gains
for Tip/Ring and 4-wire side connections
• TIA (Telecommunications Industry Association)
MEI (Multiple Extension Interworking) compatible
architecture: CAS (CPE Alerting Signal) detection
is selectable between Tip/Ring and 4-wire side
• 4-wire side CAS detection is Bellcore talkoff and
talkdown compliant when near end speech is
attenuated 8 dB or better, and is close to talkoff
compliant even without near end speech attenuation
• Tip/Ring side CAS detection typically meets
talkdown condition 1 (the average case)
• 1200 baud Bell 202 and CCITT V.23 FSK
demodulation
• Selectable 3-wire FSK data interface (serial bit
stream or 1 byte buffer) with facility to monitor stop
bit for framing error check
• FSK carrier detect status output
• 3 to 5 V ± 10% supply voltage
• Uses 3.579545 MHz crystal
• Low power CMOS with power down mode
Applications
• Bellcore compliant CIDCW (Calling Identity
Delivery on Call Waiting) and CWD (Call Waiting
Deluxe) telephones
• CIDCW and CWD telephone adjunct boxes
November 2006
MT88E46AS
MT88E46ASR
MT88E46AS1
MT88E46ASR1
Ordering Information
20 Pin SOIC
20 Pin SOIC
20 Pin SOIC*
20 Pin SOIC*
*Pb Free Matte Tin
-40 to +85 °C
Tubes
Tape & Reel
Tubes, Bake &
Drypack
Tape & Reel,
Bake & Drypack
• Computer Telephony Integrated (CTI) systems
Description
The MT88E46 is a CMOS integrated circuit suitable for
receiving the FSK and CAS signals in North American
(Bellcore) CIDCW, CWD and CID (Calling Identity
Delivery) services. It provides an optimal solution for the
CIDCW (also known as Type 2) and CWD (Type 2.5)
telephone set applications by providing separate input op-
amps for Tip/Ring and 4-wire side (receive pair of the
telephone hybrid or speech IC) connections. The Tip/Ring
connection is compatible with TIA’s MEI scheme and can
be used for FSK demodulation and ‘on hook mode’ CAS
detection. The 4-wire side connection is for ‘off hook
mode’ CAS detection. The CAS detection modes - on
hook and off hook - use different algorithms which are
optimized for the CPE states. In ‘off hook mode’ the CAS
detector is Bellcore compliant when near end speech is
attenuated 8dB or better. ‘On hook mode’ is optimized for
talkdown only and typically meets talkdown condition 1
(the average case) without speech attenuation at Tip/Ring
such as in the on hook state MEI CPE.
GS1
IN1+
IN1-
IN2+
IN2-
GS2
V_REF
GS1en
+
-
PWDN ^GS1en
+
-
Anti-Alias
Filter
PWDN
Bias
Generator
MODE PWDN GS1en
FSKen CASen
PWDN
Control Bit
Decode
Oscillator
FSK
Bandpass
FSK
Demod
FSKen
CASen
Carrier
Detector
2130Hz
Bandpass
2750Hz
Bandpass
Tone
Detection
Algorithm
CASen
On/Off Hook mode
MODE
Data Timing
Recovery
DR
DET
DATA
DCLK
CD
DR/DET
Vdd
Vss
OSC1 OSC2
CB0 CB1 CB2
Figure 1 - Functional Block Diagram
Patent pending
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