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| 型号： | IDTNW6005AS |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 17/20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： | NW6005AS |
6
INDUSTRIAL TEMPERATURE RANGE
NW6005 ENHANCED TYPE II CALLER ID DECODER
DUAL TONE ALERT SIGNAL DETECTION
The Dual Tone Alert Signal is used only in off-hook signalling in
Bellcore system and ETSI system, but in BT system it is used in both
on and off-hook signalling. The low and high tone frequencies of three
different systems are as follows:
When the device selects DT-AS detection, the bi-purpose output
pin DR/STD is STD. STD goes low when DT-AS has been detected
and return high after DT-AS has ended.
The incoming Alert Signal goes through anti-alias filter and then is
separated into high band and low band by two bandpass filters. The
tone detection algorithm examines the filter outputs to validate the
arrival of the DT-AS. The EST pin becomes active when both tones
are detected. The EST is only the preliminary indication, it must be
qualified by the “guard time” as required by Bellcore, BT and ETSI (a
minimum duration for valid signals). STD is the guard time qualified
DT-AS detection output, it indicates the correct detection.
Fig. 5 shows the operation of the guard time circuit and Fig. 6
shows the waveform of the EST, ST/GT and STD pins. The total
recognition time is t
REC = tDP + tGP, where tDP is the tone present detection
time and t
GP is the tone present guard time. The total absent time is tABS
= t
DA + tGA, where tDA is the tone absent detection time and tGA is the tone
absent guard time. The guard time is the RC time constant for the
capacitor charge to VCC or discharge to GND. To get the unequal
present and absent guard time, a diode can be connected as shown
in Fig. 7 to provide different RC time constant (varying resistance
value) during charging and discharging.
Figure 7. Guard Time Circuits with Unequal Present and
Absent Times
tGP > tGA
tGP=R1CIn(VCC/(VCC-VTGT ))
tGA=RPCIn((VCC-Vd(RP/R2))/
(VTGT-Vd(RP/R2)))
RP=R1R2/(R1+R2)
Vd=diode forward voltage
tGP < tGA
tGP=RPCIn((VCC-Vd(RP/R2))/
(VCC-VTGT -Vd(RP/R2)))
tGA=R1CIn(VCC/VTGT )
RP=R1R2/(R1+R2)
Vd=diode forward voltage
BT
Bellcore & ETSI
Low Tone
Frequency
2130 Hz ± 1.1% (on-hook)
2130 Hz
± 0.6% (off-hook)
2130 Hz
± 0.5%
High Tone
Frequency
2750 Hz
± 1.1% (on-hook)
2750 Hz
± 0.6% (off-hook)
2750 Hz ± 0.5%
Figure 5. Guard Time Circuit of Dual Tone Alert Signal
Detection
Alerting Signal
ON
t
DP
t
DA
t
GA
t
GP
V
TGT
V
TGT
t
REC
t
ABS
DT-AS
EST
ST/GT
STD
Q1
Switch
Q2
Switch
Figure 6. Guard Time Waveform
R1
R2
C
NW6005
VCC
ST/GT
EST
R1
R2
C
NW6005
VCC
ST/GT
EST
NW6005
Dual tone detected
VCC
C3
R5
Q1
Q2
P
N
Comparator
VTGT
ST/GT
EST
STD
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相关代理商/技术参数 |
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| IDTNW6005ASG | 功能描述:IC CALLER ID DECODER 20SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
| IDTNW6006AS | 功能描述:IC CALLER ID DECODER 20-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
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| IDTP62000NLG8 | 制造商:Integrated Device Technology Inc 功能描述:IC PWM CTRLR 2/3/4-PHASE 64QFN |
| IDTP63131-00NDGI | 制造商:Integrated Device Technology Inc 功能描述:IC BUCK CTRLR MULTI-PH 40QFN |
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