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2022-09-21 17:24:28
AS2523, AS2524, AS2524B telephone line interface and speaker circuit
Main features
-28 pins CMOS-IC line/speaker circuit, simple inventory: AS2523 /24 and AS2523/24B of the same mold
- Serial I/F, AS2524 on AS2523 in AS2523 Only on AS2523, programmable sending and receiving gain
-Invic volume control of AS2523 receiving signal
-D DC features can only be programmed on AS2523
-It-only AS2523 Double-soft editing in the mobile phone mode
-Still editing in only AS2523 in AS2523
-Inoscourse, for loudspeaker and non-mention
-The power voltage of the external circuit generates
-Feon line loss compensation on only AS2523/24B
-In external optional actual impedance and compound impedance components
-External components can be available. Choose the side adaptation
-In unique EMC performance
-On the range of working ranges from 15 mAh to 100 mAh (as low as 5 mAh) There are few external components
General description
AS2523/24 is a CMOS integrated circuit, which integrates DC and communication line adaptive (DC shielding and synthetic AC impedance 1000Ω) and voice circuits. It has soft soft circuits Editing, line loss compensation, and RX volume control can be used for handheld and unreasonable operations. It should be used as the A/B -line power supply device. The CPU is controlled through the serial interface on the AS2523, or the standard dial device is controlled by parallel interface control on the parallel interface on AS2524 and
AS2524B.
Application
Enhanced mobile phone -free mobile phone, supporting caller ID and extended display. AS2524 and AS2524B are developed for interfaces with ordinary Taiwan dialogues.
Package Provide 28 -pin SOIC or mold
block diagram
Detailed frame diagram
Functional description
DC conditions
The normal working mode is 15-100 mAh. A decrease in performance is from 5 mAh to 15 mAh. Within 0mAh to 5 mAh's lines, the equipment is in the power off mode.
The DC characteristic of the 30Ω resistor between the voltage of lipin and the LI-and LS pinsDecide. Its calculation formula is as follows: vls vli+Iline*30Ω. VLI can be programmed as 3.5V or 4.5V. 
AS2523/24 built a public venue on the two Whist Tong Bridge. This provides the maximum independence between AC impedance and side sounds. A person can adapt to the side sound without changing the impedance.
AC impedance
AS2523/24 AC impedance settings are T.M.1000Ω. External capacitors can be complicated in CI pins. If the external resistor of about 1.5kΩ is connected to the LS pin, it can be programmed to 600Ω.
Side sound
Use the following formulas to achieve good subcontracting: zbal/zline 10
Transmission path
M1/m2 → ls of LS The gain is set to+37db. This gain can be transformed from+30db to+45dB (register TXGAIN) from+30db on AS2523, and set at+37db by default on AS2524/24B. The input impedance is 10kΩ. The soft clamp circuit limits the output voltage of LS to 2VP. This road has a limited liability company.
M3/M4 → LS's gain is set to+46db. This gain can be changed from+39db to+54dB by programming with 1DB steps on AS2523. The input impedance is 10kΩ. The soft clamp circuit limits the output voltage of LS to 2VP. There is no limited liability company.
Receiving path
LS → RO receiving path is set to+7.5db.
This gain can be changed by programming from -7.5db to+7.5DB (register Rxgain). The receiving input is the differential signal of RI and STB. The soft clamp circuit restricts the output voltage of the RO to 1VP. It can prevent serious distortion and sound shock. This road has a limited liability company.
LS → LO's gain of the receiving path is set to+32DB.
This gain can be changed from+19db to-
1 decibel step into 34 decibels. Users can also change the gain through the receiver gain of the register (see Section Exemption "). The receiving input is international rotation and set -top box. The soft clamp circuit restricts the output voltage at low voltage at 1.1VP. It can prevent serious distortion and sound shock. This path has optional LLC.
Line loss compensation (AS2523