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参数资料
| 型号： | IDTNW6006AS |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 21/22页 |
| 文件大小： | 0K |
| 描述： | IC CALLER ID DECODER 20-SOIC |
| 标准包装： | 37 |
| 类型： | 来电身份解码器 |
| 应用： | 传真，调制解调器，寻呼机 |
| 电压 - 电源，模拟： | 2.5 V ~ 3.8 V |
| 电压 - 电源，数字： | 2.5 V ~ 3.8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 管件 |
| 其它名称： | NW6006AS |
8
INDUSTRIAL TEMPERATURE RANGE
NW6006 ENHANCED TYPE II CALLER ID DECODER
WITH STUTTER DIAL TONE DETECTOR
OTHER FUNCTIONS
Power-down Mode
The device provides the power-down feature to reduce the power
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.
In this mode, both input OP amps, reference voltage and the
oscillator are non functional. When the device is in power-down, DATA,
DR/STD, CD/STRDT are high; EST and ST/GT are low.
An intelligent Power-down feature is implemented to further reduce
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
A 3.579545 MHz crystal oscillator or other external clock source is
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.
FSK CARRIER DETECTION
The carrier detector detects the presence of a signal of sufficient
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.
When CD is inactive (high), the raw output of the FSK
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.
Since signals such as DT-AS, DTMF tones and speech are within
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.
to the next device
(b) Common Crystal Connection of Several Devices
Sharing One Timing Source
(a) Connection of One Device with Crystal Oscillator
NW6006
OSCIN
OSCOUT
3.579545MHz
NW6006
OSCIN
OSCOUT
NW6006
OSCIN
OSCOUT
NW6006
OSCIN
OSCOUT
3.579545MHz
Figure 8. Applicaiton of Clock Driven Circuit
APPLICATION NOTE
CONTROL BITS PROGRAMMING
Functionality of the NW6006 can be selected by coding CB0-CB2,
as shown in Table 2.
Table 2. Control Bits Programming
Functionality Group
CB0
CB1
CB2
FSK Demodulation Mode 0
0
1
FSK Demodulation Mode 1
1
Hybrid DT-AS Detection with Stuttered
Dial Tone Detection
1
0
Hybrid DT-AS Detection Only
0
1
0
Tip/Ring DT-AS Detection with Stuttered
Dial Tone Detection
1
0
1
Tip/Ring DT-AS Detection Only
0
1
Power Down
1
0
Factory Test Only
0
HYBRID CONNECTION
To optimize the device’s talkdown and talkoff performance, Hybrid
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.
It is highly recommended to demodulate the FSK signal using the
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.
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