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参数资料
| 型号： | W91030BSG |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | TELEPHONE CALLING NO IDENT CKT, PDSO24 |
| 封装： | 300MIL, ROHS COMPLIANT, PLASTIC, SOP-24 |
| 文件页数： | 29/32页 |
| 文件大小： | 245K |
| 代理商： | W91030BSG |
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W91030B
Publication Release Date: Sep. 27, 2005
- 6 -
Revision A2
7.
FUNCTIONAL DESCRIPTION
Figure 6 is shown functional blocks of W91030B. The device must operate with a 3.579545 MHz
system clock and consists four major functions and decribed as follows:
7.1
Ring Detector
The application circuit in Figure 7-1 illustrates the relationship between the RNGDI, RNGRC and
RNGON signals. The three pin combination is used to detect an increase of the RNGDI voltage from
ground to a level above the Schmitt trigger high going threshold voltage VT+.
Figure 7-1. Application Circuit of the Ring Detecter
The RC time constant of the RNGRC pin is used to delay the output pulse of the RNGON pin for a low
going edge on RNGDI. This edge goes from above the VT+ voltage to the Schmitt trigger low going
threshold voltage VT-. The RC time constant must be greater than the maximum period of the ring
signal, to ensure a minimum RNGON low interval and to filter the ring signal to get an envelope
output.
The diode bridge shown in Figure 7-1 works for both single ended ring signal and balanced ringing.
R1 and R2 are used to set the maximum loading and must be of equal value to achieve balanced
loading at both the tip and ring line. R1, R3 and R4 form a resistor divider to supply a reduced voltage
to the RNGDI input. The attenuation value is determined by the detection of minimal ring voltage and
maximum noise tolerance between tip/ring and ground.
Tip/A
R1 = 470K
C1 = 0.1uF
Ring/B
C1 = 0.1 uF
C3 = 0.22 uF
R5 = 150 K
R2 = 470 K
R3 = 200 K
R4 = 300 K
RNGDI
W91030B
RNGRC
RNGON
Allowance minimal ring voltage (peak to peak) is:
Vpp (max ring) = 2 (V T+(max) (R1 + R3 + R4) / R4 + 0.7)
Tolerance to noise between Tip and Ring and Vss is:
Vpeak (max noise) = V T+(min) (R1 + R3 + R4) / R4 + 0.7
Time constant is:
T = R5 C3 ln [V
/ (V
- VT+ )]
V T+(min) <= V
T+
<= V T+(max)
R5 from 10K ohm to 500K ohm.
C3 from 47 nF to 0.68 uF.
DD
VDD
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相关代理商/技术参数 |
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| W91031 | 制造商:WINBOND 制造商全称:Winbond 功能描述:LOW POWER CMOS INTERGRATED CIRCUIT |
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| W91031SG | 功能描述:IC CALL LINE IDENT 24-SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 电信 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 06/Feb/2012 标准包装:750 系列:* |
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