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NW6006 Datenblatt(Datasheet) 5 Page - Integrated Device Technology

Teile-Nr. NW6006
Beschreibung  ENHANCED TYPE II CALLER ID DECODER WITH STUTTER DIAL TONE DETECTOR
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Hersteller  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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5
INDUSTRIAL TEMPERATURE RANGE
NW6006 ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
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.
R2
R1
R3
R4
R5
C1
C2
NW6006
V
REF
IN+
IN-
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
Rin
Rf
C
NW6006
IN+
IN-
GS
VREF
Voltage Gain
Av = Rf / Rin
Figure 4. Single-ended Input Gain Control Circuit
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.
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.




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