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PDF NW6006-XS Data sheet ( Hoja de datos )
| Número de pieza | NW6006-XS | |
| Descripción | ENHANCED TYPE II CALLER ID DECODER WITH STUTTER DIAL TONE DETECTOR | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
NW6006
FEATURES
• 1200 baud Bell 202 and ITU-T V.23 Frequency Shift Keying
(FSK) Demodulation
• Stutter dial tone detection
• Compliant with following specifications:
Bellcore GR-30-CORE & SR-TSV-002476
TIA/EIA-716, TIA/EIA-777 Draft
TIA/EIA PN-4195 Draft
British Telecom (BT) SIN227 & SIN242
ETSI ETS 300 778-1 and -2
• Bellcore “CPE Alerting Signal (CAS)”, British Telecom “Idle State
and Loop State Tone Alert Signal” and ETSI “Dual Tone Alerting
Signal (DT-AS)” detection
• Two seperate OP amps with adjustable gain for Tip/Ring and
Telephone Hybrid connections
• Monitoring of the stop bit for framing error check
• Serial FSK data interface with selectable output of bit stream or 1
byte buffer
• FSK carrier detection
• 3 V or 5 V operation
• Low power CMOS with intelligent powerdown mode
• Operating temperature range: -40 °C to +85 °C
• Packages available:
NW6006-XS 20 pin SOIC
(where ‘X’ is the revision ID)
DESCRIPTION
The NW6006 device is a single-chip, 3/5 Volt CMOS caller ID with
call waiting detection circuit. It can receive signals following Bellcore
GR-30-CORE & SR-TSV-002476, BT SIN227 & SIN242, and ETSI
ETS 300 788-1/-2 specifications.
The NW6006 provides 1200 baud Bell 202 and ITU-T V.23 FSK
demodulation, detection in stutter dial tone mode and CAS/DT-AS
detection. Two seperate differential input amplifiers allow the device to
be connected with both Tip/Ring and Telephone Hybrid receive pair.
FSK demodulation is implemented only on Tip/Ring, while DT-AS(or
CAS) detection can be on either Tip/Ring or Hybrid Receive. In
addition, NW6006 provides a serial FSK data interface via which the
data can be selected to be processed as a bit stream or extracted
from a 1 byte built-in buffer. An on-chip Stutter Dial Tone Detector is
provided to support the voice mail applications.
The device can be used in feature or cordless phones with voice
mail for BT Calling Line Identity Presentation (CLIP), CCA CLIP and
Bellcore Calling Identity Delivery (CID) systems. It can also be used in
caller ID boxes, modem, fax machines, answering machines,
database query systems and Computer Telephony Integration (CTI)
systems.
FUNCTIONAL BLOCK DIAGRAM
OSCOUT OSCIN
CB0 CB1 CB2
VREF
IN1+
IN1-
GS1
IN2+
IN2-
GS2
Oscillator
Bias
Generator
PWDN
GS1EN
+
-
+
-
GS2EN
Control Bit Decoder
SDTEN
PWDN FSKEN GS1EN
CASEN MODE
GS2EN
Tone Alert
Detector
CASEN
FSK
Demodulator
FSKEN
Figure 1. Block Diagram
SDTEN
Stutter Dial Tone
Detector
Guard Time
Data/Timing Recovery
MODE
ST/GT
DR/STD
EST
CD/STRDT
DCLK
DATA
The IDT logo is a registered trademark of Integrated Device Technology, Inc
INDUSTRIAL TEMPERATURE RANGE
©2002 Integrated Device Technology, Inc.
JULY 2002
DSC-6049/3
1 page  
NW6006 ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
INDUSTRIAL TEMPERATURE RANGE
DT-AS DETECTION ON EITHER TIP/RING OR HYBRID
RECEIVE PAIR
In off-hook services, the detection of Dual Tone Alert Signal (DT-AS)
will affect the quality of the call waiting service. Even though the end
office has muted the far end party before and after it sends DT-AS, the
near end user who is to receive the FSK information may be still
talking. Therefore, the CPE must be able to detect DT-AS successfully
in the presence of near end speech. Furthermore, imitation of DT-AS
by speech will also affect the DT-AS detector, thus false detection may
be generated.
To achieve better DT-AS detection quality, a method is to put DT-AS
detection on the telephone hybrid receive pair instead of on Tip/Ring.
As the near end speech has been attenuated while the DT-AS level is
the same as on Tip/Ring, the DT-AS immunity is improved.
A CPE capability called Multiple Extension Interworking, in process
of being defined by Bellcore, requests the CPE be capable of detecting
DT-AS when the line is off-hook, although the CPE itself may be on-
hook. Under some conditions, an on-hook CPE may send an
acknowledgment to the end office. Also, the on-hook CPE’s capability
of detecting DT-AS enables the call logs between on and off-hook
CPEs to be maintained synchronous. In this way, when all off-hook
CPEs are MEI compatible and DT-AS is received, one of the CPEs will
send the acknowledgment signal and all CPEs will receive FSK.
Therefore, if the DT-AS detector is connected only to the hybrid
receive pair, the CPE can not detect DT-AS when it is on-hook. When
the CPE is on-hook, either the hybrid is non-functional or the signal
level is severely attenuated. Thus, an on-hook CPE must be able to
detect DT-AS from Tip/Ring.
The NW6006 provides two input OP amps via which the device can
be connected both to Tip/Ring and to the Hybrid Receive pairs. Both
connection can be differential or single-ended. FSK demodulation is
implemented only on Tip/Ring, while DT-AS detection can be on either
Tip/Ring or Hybrid Receive. Tip/Ring DT-AS detection is required for
MEI and BT’s on-hook CLIP.
BLOCK DESCRIPTION
The NW6006 requires a 3.579545 MHz system clock and consists
of four major functional blocks: Analog Input Circuit, Dual Tone Alert
Signal Detection, Stutter Dial Tone Detection and FSK Demodulation.
ANALOG INPUT CIRCUIT
The input signal is processed by the Analog Input Circuit block,
which is comprised of two OP amps and a bias source (VREF). VREF
is the output of a low impedance voltage source used to bias the input
OP amp, and is typically equal to VCC/2. The Tip/Ring OP amp
(IN1+, IN1-, GS1 pins) is for connecting to Tip and Ring, while the
Hybrid OP amp (IN2+, IN2-, GS2 pins) is for connecting to Hybrid
Receive Pair. The gain adjustable OP amps are also used to select
the input gain by connecting a feedback resistor between GS and the
IN- pin. Fig. 3 shows the differential input configuration. In single-
ended configuration, the gain adjustable OP amp is connected as
shown in Fig. 4.
R3 R4
VREF
NW6006
C1 R1
C2 R2
IN+
IN-
R5 GS
Differential Input Amplifier
C1=C2
R1=R2 (For unity gain R5=R2)
R3=(R4R5)/(R4+R5)
Voltage Gain
Av = R5/R2
Input Impedance
Zin =2√R1²+ (1/ωC)²
Figure 3. Differential Input Gain Control Circuit
It should be noted here that as the Hybrid OP amp is for DT-AS
detection only, its gain can always be adjusted specifically for the DT-
AS signal.
STUTTER DIAL TONE SPECS SUPPORTED
The NW6006 also supports TIA/EIA Stutter Dial Tone specification
PN-4159 Draft. This specification defines the requirement for the
singalling of Stutter Dial Tone (SDT). When there is a message waiting
in a customer’s voicemail box, the serving telephone company’s
Central Office (CO) switch may apply a SDT signal to the customer’s
line when it is taken off-hook. An SDT CPE is used to automatically
detect the SDT in response to an on-hook to off-hook transition and
provide an indication.
C Rin
Voltage Gain
Av = Rf / Rin
NW6006
IN+
IN-
Rf GS
VREF
Figure 4. Single-ended Input Gain Control Circuit
5
5 Page 
NW6006 ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
INDUSTRIAL TEMPERATURE RANGE
Microphone
Tx+
TIP TIP Telephone Tx-
Hybrid
Speaker
RING
RING
Rx+
Rx-
C1 R1
A
39k
C2 R2
B
39k
282k
GND Xtal
FSK Interface Mode 1 is selected
NW6006
VREF
IN1+
IN1-
GS1
GND
OSCIN
OSCOUT
CB0
DCLK
DATA
IN2+
IN2-
GS2
CB2
CB1
VCC
CD/STRDT
ST/GT
EST
DR/STD
200k
2n2
470k
470k
2n2
VCC= 3V +/-10%
R3
R4
To Microcontroller
From Microcontroller
Note:
1. Resistors are 1%, 0.1Watt; Unless stated, capacitors are 5%, 6.3 V.
2. All diodes in the circuit are 1N4148 or equivalent.
3. Xtal is 3.579545 MHz, 0.1% crystal or ceramic resonator.
4. Tip/Ring op amp gain = 0 dB; Hybrid Receive op amp gain = -3 dB.
5. For 1000 Vrms, 60 Hz isolation from Tip to Earth and Ring to Earth:
R1, R2 = 430 k, 0.5 W, 5%, 500 V min. C1, C2 = 2n2, 250 V min.
6. For BT application, R3=R4= 422k;
For Bellcore application, R3=825k, R4=226k.
Figure 10. Typical Application Circuit For Bellcore MEI Compatible Type II Telephone
with Stutter Dial Tone Detection, 3 V Operation
11
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| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NW6006-XS.PDF ] | |
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