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參數資料
| 型號： | W91031 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | LOW POWER CMOS INTERGRATED CIRCUIT |
| 中文描述： | TELEPHONE CALLING NO IDENT CKT, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-24 |
| 文件頁數： | 8/29頁 |
| 文件大小： | 274K |
| 代理商： | W91031 |
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Preliminary W91031
- 8 -
Input Pre-processor
The input signal is processed by an Input Pre-processor, which is added to the offset voltage to adjust
the input amplitude and to filter out unwanted frequencies. The gain control op-amp is used to bias
the input voltage with the VREF signal voltage. The voltage of VREF pin is V
DD
/2 typically, this pin
must connected a 0.1
μ
F capacitor to V
SS
. It is also used to select the input gain by connecting a
feedback resistor between this pin and the INN pin. Figure 7-2 shows the necessary connections with
the tip/ring line inputs. In a single-ended configuration, the gain control op-amp is connected as
shown in Figure 7-3.
INP
INN
+
-
GCFB
R1
C1
C2
R2
R4
R3
R5
VREF
Tip
Ring
W91031
Differential Input Amplifier
C1 = C2
R1 = R2
R3 = (R4 R5) / (R4 +R5)
Voltage Gain
Av = R5 / R1
Input Impedance
Zin = 2 R1
2
+ (1 / wC)
2
0.1 uF
Figure 7-2 Differential Input Gain Control Circuit
C
R1
R2
Input
+
-
INP
INN
GCFB
VREF
Voltage Gain
A
V
= R2 / R1
W91031
0.1 uF
Figure 7-3 Single-ended Input Gain Control Circuit
Dual Tone Alert Signal Detection
The dual tone alert signal is separated into high and low tones and detected by a high/low tone
detector. The dual tone alert signal detection circuit is enabled when the FSKE signal is low. It
requires an enable time to enable the dual tone alert signal detector when FSKE goes from high to
low. The ALGR is the output of the dual tone detector and when high indicates that the high tone and
low tone alert signals have been detected. The guard time improves detection performance by
rejecting detected signals with insufficient duration and by masking momentary detection dropout.
Figure 7-4 shows the relationship between the ALGR, ALGRC and ALGO pins and Figure 7-5 shows
the guard time waveform of the same pins. The total recognition time is t
REC
= t
DP
+ t
GP
, where t
DP
is
the tone present detect time and t
GP
is the tone present guard time. The tone present guard time is
the RC time constant with the capacitor discharging from V
SS
to V
DD
(the ALGRC pin discharges
from V
SS
to V
DD
through a resistor). The capacitor will discharge rapidly via a discharge switch after
ALGO returns high. The total absent time is t
ABS
= t
DA
+ t
GA
, where t
DA
is the tone absent detect time
and t
GA
is the tone absent guard time. The tone absent guard time is the RC time constant with the
capacitor charging from V
DD
to V
SS
(the ALGRC pin charges from V
DD
to V
SS
through a resistor). The
capacitor will charge rapidly via a charge switch after ALGO returns low. To obtain unequal present
and absent guard times, a diode can be connected as shown in Figure 7-6, to give the unequal
resistance required during capacitor charging and discharging.
相關PDF資料 |
PDF描述 |
|---|---|
| W91031S | Calling Line Identifier |
| W91080 | Tone/Pulse Dialer With Handfree And Keytone Fuctions And One Number Memory(具有一個數碼存儲器免提和主鍵音功能的音頻/脈沖撥號器) |
| W91080A | Tone/Pulse Dialer With Handfree And Keytone Fuctions And One Number Memory(具有一個數碼存儲器免提和主鍵音功能的音頻/脈沖撥號器) |
| W91082N | Tone Generator With μC Serial Interface(具有微控制器接口的音頻發生器) |
| W91312A | Tone/Pulse Dialer With Redial Function(具有重撥功能的音頻/脈沖撥號器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W91031S | 制造商:WINBOND 制造商全稱:Winbond 功能描述:Calling Line Identifier |
| W91031SG | 功能描述:IC CALL LINE IDENT 24-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 06/Feb/2012 標準包裝:750 系列:* |
| W91031SG (SA5825) TR | 制造商:Nuvoton Technology Corp 功能描述:FSK DECORDER WITH CALL ON WAIT |
| W91031SG T&R | 制造商:Nuvoton Technology Corp 功能描述:IC CALL LINE IDENT 24-SOIC |
| W91031SG T&R | 功能描述:IC CALL LINE IDENT 24-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 06/Feb/2012 標準包裝:750 系列:* |
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