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PDF NW6003 Data sheet ( Hoja de datos )
| Número de pieza | NW6003 | |
| Descripción | TYPE II CALLER ID DECODER | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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TYPE II CALLER ID DECODER
NW6003
FEATURES
• 1200 baud Bell 202 and ITU-T V.23 Frequency Shift Keying (FSK)
Demodulation
• Compliant with three specifications:
Bellcore GR-30-CORE & SR-TSV-002476
British Telecom (BT) SIN227 & SIN242
Cable Communication Association (CCA) TW/P&E/312
• Bellcore “CPE Alerting Signal (CAS)” and British Telecom “Idle
State and Loop State Tone Alert Signal” detection
• Ring and line reversal detection
• High sensitivity with -40 dBV input Tone and FSK Detection
• Serial data interface to microcontroller
• 3 V ±10% or 5 V ±10% operation
• Low power CMOS with powerdown mode
• Operating temperature range: -40 °C to +85 °C
• Packages available:
NW6003-XS 24 pin SOIC
(where ‘X’ is the revision ID)
DESCRIPTION
The NW6003 device is a single-chip, 3/5 Volt CMOS caller ID and
call waiting detection circuit. It can receive signals following Bellcore
GR-30-CORE & SR-TSV-002476, BT SIN227 & SIN242, and CCA TW/
P&E/312 specifications.
The NW6003 provides 1200 baud Bell 202 and ITU-T V.23 FSK
demodulation. It allows a microcontroller to extract data from it via a
serial interface. In addition, the NW6003 offers Idle State and Loop
State Tone Alert Signal and line reversal detection capability for BT
CLIP, ring burst detection for the CCA CLIP, and ring and CAS
detection for Bellcore CID.
The device can be used in feature or cordless phones 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
TRIGIN
TRIGRC
TRIGOUT
OSCIN
OSCOUT
VREF
CAP
PWDN
IN +
IN -
Oscillator
3 V/5 V
Detector
Bias
Generator
+
-
Line Reverse
and
Ring Detector
Dual Tone
Detector
FSK
Demodulator
Interrupt
Generator
Guard Time
Data/Timing Recovery
INT
STD
ST/GT
EST
CD
DCLK
DATA
DR
GS FSKEN
Figure 1. Block Diagram
MODE
The IDT logo is a registered trademark of Integrated Device Technology, Inc
INDUSTRIAL TEMPERATURE RANGE
©2002 Integrated Device Technology, Inc.
JULY 2002
DSC-6047/2
1 page  
NW6003 TYPE II CALLER ID DECODER
INDUSTRIAL TEMPERATURE RANGE
CLIP/CID CALL ARRIVAL DETECTION
Figure 6 shows the typical application circuit to detect the CLIP/CID
call arrival signals. The diode bridge works for both single ended and
balanced ring signals. R1 and R2 are used to set the maximum
loading and must be of some value to achieve balanced loading. The
ring signal is attenuated by R1, R3 and R4 resistor devider before
being applied to pin TRIGIN. The attenuation value is determined by
the detection of minimal ring voltage and maximum noise tolerance
between Ring/Tip and ground.
Ring Signal
TRIGIN
TRIGRC
VT+
VT-
VT+
When no signal is applied to telephone line, TRIGIN will be at
ground and pin TRIGOUT will stay inactive high. If TRIGIN increases
from ground to VT+ (Schmitt trigger high going threshold voltage), C3
gets discharged, TRIGRC becomes low and TRIGOUT is asserted.
The low going TRIGOUT can be used to interrupt or wake up the
microcontroller. When TRIGIN signal drops below VT- (Schmitt trigger
low going threshold voltage), C3 will start to charge up through R5C3
time constant. After TRIGRC pin reaches above the threshhold voltage
(VT+), TRIGOUT becomes inactive high and it stops to interrupt the
microcontroller. To ensure the minimum TRIGOUT low interval and to
filter the ring signal to get a smooth envelope output, the RC time
constant should be greater than the maximum cycle time of the Ring
Signal.
Ring Detection for Bellcore: Bellcore recommends that the CID
FSK data be transmitted between first and second ringings. The circuit
in Figure 6 will generate a ring envelope signal at pin TRIGOUT for
the ring voltage of 40 Vrms or greater. R5 and C3 are used to filter the
ring signal to provide the envelope output.
TRIGOUT
Figure 5. TRIGIN, TRIGRC and TRIGOUT Operation
Line Reversal Detection for BT: British Telecom uses the line
polarity reverse (+15 V to -15V between the two lines slewing in 30
ms) to indicate the arrival of an incoming CDS call. When line reverse
occurs, TRIGIN increases over VT+ and TRIGOUT signal becomes
active low. When reversal is over, TRIGIN falls below VT- and
TRIGOUT returns inactive high.
Ring Burst Detection for CCA: The CCA requires the TE to
detect a single burst of ringing followed by the FSK data. The ring
pulse may varies from 30 to 75 Vrms with pulse duration 200 - 450
ms.
Tip/A
C1= 0.1 µF
R1 = 500K
C2= 0.1 µF
Ring/B
R2 = 500K
R3 = 200K
TRIGIN
R4 = 300K
R5 = 330K
TRIGRC
C3 = 0.22 µF
NW6003
N
To Microcontroller
TRIGOUT
Note:
Minimal triggerable ring voltage (peak to
peak) is:
Vpp(max ring)=
2(VT+(max)(R1+R3+R4)/R4+0.7)
Tolerance to noise between Tip/Ring and Vss
is:
Vmax noise=
VT+(min)(R1+R3+R4)/R4+0.7
Suggested RC component value:
10K Ω < R5 < 500K Ω.
47 nF < C3 < 0.68 µF
Time constant is:
T=R5×C3×In(VCC/(VCC-VT+))
VT+(min) = 0.7 VCC
VT+(max) = 0.5 VCC
Figure 6. CLIP/CID Call Arrival Detection Circuit
5
5 Page 
NW6003 TYPE II CALLER ID DECODER
INDUSTRIAL TEMPERATURE RANGE
CPE off-hook
A/B wires
Note 2
PWDN
FSKEN
CAS
A
Note 4
CPE mutes handset and
disable keypad
CPE sends
ACK
BCD
Note 3
Note 5
Mark Message
EF
CPE unmutes handset and
enable keypad
G Note 1
Note 6
STD
INT
CD
DR
DCLK
DATA
...
...
Data
Figure 14. Bellcore Off-hook Data Transmission Timing Diagram
Notes:
1) A= 75 - 85 ms, B= 0 -100 ms, C= 55 - 65 ms, D= 0 - 500 ms, E= 58 - 75ms, F depends on data length, G≤ 50 ms.
2) If AC power is not available, the designer may use the line power when the CPE goes off-hook and use battery power while on-hook. The CPE should also be CID (on-hook) capable .
3) If the end office fails to send the FSK signal, the CPE should disable FSKEN to unmute the handset and enable the keypad after this interval.
4) When FSK signal is not expected, the FSKEN pin should be set low to disable the FSK demodulator.
5) FSKEN should be high as soon as the CPE has finished sending the acknowledgement signal ACK.
6) FSKEN should be low when CD become inactive.
11
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet NW6003.PDF ] | |
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