NW6006-XS Integrated Device Technology, NW6006-XS Datasheet - Page 8

• Manufacturer Part Number: NW6006-XS
• Description: ENHANCED TYPE II CALLER ID DECODER WITH STUTTER DIAL TONE DETECTOR
• Manufacturer: Integrated Device Technology

FSK CARRIER DETECTION
amplitude at the output of the FSK bandpass filter. If the signal is
qualified by a digital algorithm, it set the CD output to low indicating a
successful carrier detection. NW6006 supplies a 10 ms hysteresis to
allow for momentary signal drop out once CD has been activated.
When there is no activity at the FSK bandpass filter output for 10 ms,
CD is released.
demodulator is ignored by the FSK data output interface. In mode‘0’,
the DATA pin is forced high. In mode ‘1’, the internal shift register is not
updated. If DCLK is clocked, DATA is undefined.
the FSK frequency band and thus may activate the carrier detector.
The NW6006 should be put into DT-AS or power down mode when
FSK is not expected to avoid false carrier detection and false
demodulation.
OTHER FUNCTIONS
Power-down Mode
consumption. Power-down can be activated by setting Control Bits 0-2
to ‘100’. Note that momentary transition of CB0-2 into the power-down
code won’t activate power-down but will reset the device.
oscillator are non functional. When the device is in power-down, DATA,
DR/STD, CD/STRDT are high; EST and ST/GT are low.
the operating current. When FSK is selected, DT-AS detector and
Stuttered Dial Tone Detection are powered down. When DT-AS and
STRDT are selected, FSK demodulator is powered down. The Tip/
Ring and Hybrid input OP amps are not affected in the intelligent
Power-down.
Crystal Oscillator
required for NW6005. The crystal can be directly connected between
OSCIN and OSCOUT pins without any external component. If an
external clock source is used, OSCIN pin should be driven by the
clock source and OSCOUT pin is left floating or is used to drive other
devices. Fig. 8 shows some applications.
NW6006 ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
The carrier detector detects the presence of a signal of sufficient
When CD is inactive (high), the raw output of the FSK
Since signals such as DT-AS, DTMF tones and speech are within
The device provides the power-down feature to reduce the power
In this mode, both input OP amps, reference voltage and the
An intelligent Power-down feature is implemented to further reduce
A 3.579545 MHz crystal oscillator or other external clock source is
8
APPLICATION NOTE
CONTROL BITS PROGRAMMING
as shown in Table 2.
Table 2. Control Bits Programming
HYBRID CONNECTION
connection is recommended. There are two Op Amps in NW6006
which bring convenience for Hybrid connection. When connected to
the Hybrid Op Amp, the Hybrid circuit will attenuate the speech signal
at least 9 dB from the microphone to the speaker, which leads a much
better performance of near-end talkdown and talkoff.
Tip/Ring OP Amp and to detect the CAS signal using the Hybrid OP
Amp. This implementation brings not only optimized talkdown and
talkoff performance, but also the convenience to adjust FSK and CAS
sensitivity separately.
FSK Demodulation Mode 0
FSK Demodulation Mode 1
Hybrid DT-AS Detection with Stuttered
Dial Tone Detection
Hybrid DT-AS Detection Only
Tip/Ring DT-AS Detection with Stuttered
Dial Tone Detection
Tip/Ring DT-AS Detection Only
Power Down
Factory Test Only
Functionality of the NW6006 can be selected by coding CB0-CB2,
To optimize the device’s talkdown and talkoff performance, Hybrid
It is highly recommended to demodulate the FSK signal using the
(a) Connection of One Device with Crystal Oscillator
(b) Common Crystal Connection of Several Devices
OSCIN
Sharing One Timing Source
3.579545MHz
NW6006
Figure 8. Applicaiton of Clock Driven Circuit
Functionality Group
OSCOUT
OSCIN
OSCIN
INDUSTRIAL TEMPERATURE RANGE
3.579545MHz
NW6006
NW6006
OSCOUT
OSCOUT
CB0
0
1
1
0
1
0
1
0
OSCIN
to the next device
NW6006
CB1
1
1
1
1
0
0
0
0
OSCOUT
CB2
1
1
0
0
1
1
0
0