nw6003 Integrated Device Technology, nw6003 Datasheet - Page 4

• Manufacturer Part Number: nw6003
• Description: Type Ii Caller Id Decoder
• Manufacturer: Integrated Device Technology

NW6003 TYPE II CALLER ID DECODER
FUNCTIONAL DESCRIPTION
CALLER ID SPECS SUPPORTED
capability. It supports Bellcore, BT and CCA specifications. The major
differences between above specs are as follows (refer to Figure 13,
Figure 14, Figure 15, Figure 16 and Figure 17):
BELLCORE
requirement for the signaling services of Calling Number Delivery
(CND), Calling Name Delivery (CNAM) and Calling Identity Delivery
on Call Waiting (CIDCW).
embedded in the silent interval between the first and second ringings.
The NW6003 can detect the first ringing and then demodulate the
incoming Bell-202 FSK data. In CIDCW service, information about an
incoming caller is sent to the subscriber who is engaged in another
call. A CPE Alerting Signal (CAS) indicates that a CIDCW data is
incoming. The NW6003 can detect the alerting signal and demodulate
the incoming FSK information which contains CIDCW data. The
demodulated data is output onto the serial interface.
BRITISH TELECOM
Central Office (CO) and the Terminal Equipment (TE) for the Caller
Display Service (CDS). CDS provides CLIP (Calling Line Identity
Presentation) that delivers to an idle state (on hook) TE the identity of
an incoming caller before the first ring.
arrival of a CDS call. After that comes an Idle State Tone Alert Signal,
and then Caller ID FSK information transmitted in ITU-T V.23 format.
When the subscriber is engaged in a call, the arrival of information
about another incoming call is indicated by a Loop State Tone Alert
Signal. The NW6003 can detect the line reversal and tone alert
signal, it can also demodulate the incoming ITU-T V.23 FSK signals.
CABLE COMMUNICATION ASSOCIATION
different CDS TE interface. In this specificaiton, data is transmitted
after a single burst of ringing rather than before the first ringing cycle,
as specified in the BT. The Idle State Tone Alert Signal is not required
in this case. The CCA specifies that data can be transmitted in either
Bell-202 or ITU-T V.23 format. The NW6003 can detect the ring burst,
and then demodulate either of the FSK format.
The NW6003 is a type II Caller ID device with Call Waiting
Bellcore GR-30-CORE and SR-TSV-002476 define the
In CND or CNAM service, information of the calling party is
BT SIN227 and SIN242 define the signal interface between the
A polarity reversal on the A and B wires (see Figure 6) indicates the
The CCA caller identity specification TW/P&E/312 defines a
4
BLOCK DESCRIPTION
of four major functional blocks: Analog Input Circuit, CLIP/CID Call
Arrival Detection, Dual Tone Alert Signal Dectection, and FSK
Demodulation.
ANALOG INPUT CIRCUIT
which is comprised of an operational amplifier 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 gain
adjustable op amp is also used to select the input gain by connecting
a feedback resistor between GS and the IN- pin. Figure 3 shows the
necessary connections with the A/B line inputs. In single-ended
configuration, the gain adjustable op amp is connected as shown in
Figure 4.
The NW6003 requires a 3.579545 MHz system clock and consists
The input signal is processed by the Analog Input Circuit block,
Differential Input Amplifier
C1=C2
R1=R2 (For unity gain R5=R2)
R3=(R4R5)/(R4+R5)
Input
A
B
Figure 4. Single-ended Input Gain Control Circuit
Figure 3. Differential Input Gain Control Circuit
Voltage Gain
Av = Rf / Rin
C2
C1
C
R1
R2
INDUSTRIAL TEMPERATURE RANGE
Rin
R3
Voltage Gain
Av = R5/R1
Input Impedance
Zin =2 R1
R4
Rf
R5
²
+ (1/
V
IN+
IN-
GS
IN+
IN-
GS
V
REF
REF
NW6003
C)²
NW6003