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U4090B-PFNG3Y Datasheet(PDF) 5 Page - ATMEL Corporation |
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U4090B-PFNG3Y Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 35 page 5 4741C–CORD–11/05 U4090B-P Table 2-1. Pin Description Pin Symbol Function 1GT A resistor from this pin to GND sets the amplification of the microphone and DTMF signals, the input amplifier can be muted by applying VMP to GT 2 DTMF Input for DTMF signals, also used for the answering machine and hands-free input 3 MICO Output of microphone preamplifier 4 MIC2 Non-inverting input of microphone amplifier 5 MIC1 Inverting input of microphone amplifier 6PD Active high input for reducing the current consumption of the circuit, simultaneously V L is shorted by an internal switch 7IND The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin, a resistor connected to ground may be used to reduce the DC line voltage 8 VL Line voltage 9 GND Reference point for DC- and AC-output signals 10 SENSE A small resistor (fixed) connected from this pin to VL sets the slope of the DC characteristic and also effects the line-length equalization characteristics and the line current at which the loudspeaker amplifier is switched on 11 VB Unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7V 12 SAO Output of loudspeaker amplifier 13 VMPS Unregulated supply voltage for micorcontroller, limited to 6.3V 14 VMP Regulated supply voltage of 3.3V for peripheral circuits (especially microprocessors), minimum output current: 2 mA (ringing) 4 mA (speech mode) 15 SWOUT Output for driving external switching transistor 16 COSC 40-kHz oscillator for ringing power converter 17 VRING Input for ringing signal protected by internal Zener diode 18 THA Threshold adjustment for ringing frequency detector 19 RFDO Output of ringing frequency detector 20 LIDET Line detect; output is low when the line current is more than 15 mA 21 IMPSEL Control input for selection of line impedance 1. 600 Ω 2. 900 Ω 3. Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored 22 TSACL Time constant of anti-clipping of speaker amplifier 23 GSA Current input for setting the gain of the speaker amplifier, adjustment characteristic is logarithmical, or RGSA > 2 M Ω, the speaker amplifier is switched off 24 SA I Speaker amplifier input (for loudspeaker, tone ringer and hands-free use) 25 MUTX Three-state input of transmit mute: 1. Speech condition; inputs MIC1/MIC2 active 2. DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing 3. Input DTMF used for answering machine and hands-free use; receive branch not affected 26 ATAFS Attenuation of acoustical feedback suppression, maximum attenuation of AFS circuit is set by a resistor at this pin, without the resistor, AFS is switched off 27 INLDT Input of transmit level detector 28 INLDR Input of receive level detector 29 TLDT Time constant of transmit level detector |
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