Main features

-32 stitch CMOS-IC line/voice circuit, DTMF dial, FSK transmitter and ringtone

-In enhanced voice switch

- Background noise monitoring

-Dual-dual-frequency audio generator

-fsk transmitter v.23, Bell 202, V.21, Bell 103

-TX and RX gain programming

-D digital volume control of receiving signals

-Cylotic feature programming

-D double soft in mobile phone mode Editing

-TX soft editing in the conclusion mode

-Poltic monitoring amplifier used for loudspeaker, non-mention and ringtone

-The power supply voltage of the external circuit generates

-Exical line loss compensation (LLC)

-The actual impairment and replica resistance selected by external components

-The external component can choose side sound adaptation

]-The unique EMC properties

-The working range from 15 mAh to 100 mAh (as low as 5 mAh, decreased performance)

] Generally explaining

AS2522 is a CMOS integrated circuit, which integrates DC and AC line adaptive (DC shielding and synthetic communication impedance of 1000Ω), and voice circuits with soft waves, line loss compensation and RX volume control Used for mobile phones and non -mention operations. It should be used as the A/B -line power supply device and is controlled by the CPU through the serial interface. In addition, AS2522 also integrates DTMF, FSK transmitter, single -sound and ringtone generator.

AS2522 allows the use of ready -made microprocessors in telephone applications without special modules and functions. DTMF, FSK transmitter, mono sound and ringtone generator can be controlled through serial interface and the gain settings in mobile phones and induction mode.

Application

Enhanced mobile phone -free mobile phone, supporting caller ID and extended display.

包裹

提供32针TQFP

方块图

详细框图

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Function 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 characteristics are determined by the 30Ω resistor between the voltage of lipin and the LI-and LS pin.Its calculation formula is as follows: vls vli+Iline*30Ω. VLI can be programmed as 3.5V or 4.5V.

2/4 line conversion

AS2522 has a built -in Double Whistoton Bridge and a common ground. 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

AS2522 AC impedance setting is 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 changed by programming from+30db to+45DB in 1DB step (register TXGain). 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 the step of+54db in 1DB. 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 gain setting to+1DB.

This gain can be changed by programming-6DB programming at the 1DB step (register RXGAIN) to+9DB. 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 → LO1/LO2 receiving path is set to +29 decibels. This gain can be changed by programming from+22dB to -37DB. Users can also change the gain through the register VOL (see the free " part). The receiving input is the differential signal of RI and STB. The soft clamp circuit restricts the output voltage of the LO1 LO1 at 1VP. It can prevent serious distortion and sound shock. This path has optional LLC.

Line loss compensation

line loss compensation compensation (register 0x0c). When it is activated