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U3810BM

Features: ` Slope of DC characteristics adjustable by an external resistor` Gain of transmit and receive amplifiers automatically adjusted by line length control` Regulation range adjustable by the serial bus` Possibility of fixed gain (PABX)` Sidetone balancing system adjustable with line length ...

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U3810BM: Features: ` Slope of DC characteristics adjustable by an external resistor` Gain of transmit and receive amplifiers automatically adjusted by line length control` Regulation range adjustable by the ...

U3810BM Data Sheet

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Part Number:
U3810BM
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
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Product Details

Description



Features:

` Slope of DC characteristics adjustable by an external resistor
` Gain of transmit and receive amplifiers automatically adjusted by line length control
` Regulation range adjustable by the serial bus
` Possibility of fixed gain (PABX)
` Sidetone balancing system adjustable with line length or by the serial bus
` Dynamic impedance adjustable by external components
` Stabilized power supply for peripherals
` Confidence level during dialling
` +6 dB possibility on second stage transmit gain
` Transmit and receive gains adjustable by serial bus
` Extra transmit input for handsfree and answering machine purpose
` +6 dB possibility on receive gain
` Receive amplifier for dynamic or piezo-electric earpieces
` Extra receive output for handsfree purpose
` High impedance microphone inputs suitable for dynamic, magnetic, piezo-electric or electret microphone
` Distortion of line signal and sidetone prevented by dynamic range limitation in transmission (anti-clipping)
`Squelch system in transmission prevents "room noise" are being transmitted, and improves anti-larsen efficiency (can be inhibited).
` Loudhearing gain programmable in eight steps of 4 dB, using the serial bus, or linearly adjusted, using a potentiometer
` Anti-larsen system efficiency is increased when
inhibiting squelch
` Loudhearing anti-distortion system by automatic gain control versus available current and voltage
` Switching regulator in ringing phase
` Input ringing detection, threshold and impedance adjustable with external resistors
` Ringing zero crossing information for external microprocessor
` Ringing programmable gain in eight steps of 4 dB using the serial bus
` Melody generator, with 30 frequencies in steps of semi tones, driven by serial bus
` Internal speed-up circuit permits a faster charge of VDD and VCC capacitor
` DTMF dialer driven by serial bus, in particular level and pre-emphasis adjustment
` Ability to transmit a confidence tone in speech mode using melody generator frequencies
` Five independent mutes driven by serial bus (two in transmission, two in reception, one for the transmit / receive loop)
` Standard low-cost ceramic 455 kHz / clock output for the microcontroller
` Extra loudhearing input for answering machines, handsfree and base station of phones cordless with loudhearing


Application

· Feature phones
· Answering machines
· Fax machines


Specifications

Parameters
Symbol
Value
Unit
DC calling voltage (pin 2)
VRI
35
V
DC calling current (pin 2)
IR
30
mA
Conversation line voltage (pin 10)
VL
15
V
17
V pulse 20 ms
Conversation line current
IL
150
mA
Total power dissipation *)
Ptot
1
W
Operating temperature range
Tamb
25 to +55
°C
Storage temperature
Tstg
55 to +150
°C
Junction temperature
Tj
125
°C



Description

The U3810BM multi-standard feature phone circuit isdesigned to be used with a microcontroller using a 2-wire serial bus. U3810BM performs all speech and line interface functions required in an electronic telephone set: the ringing function with switching regulator and melody generator, the DTMF dialling, the loudhearing with antilarsen and antidistortion systems, a power supply, a clock and a reset for the microcontroller. Transmit, receive and loudhearing gains control / AGC range / DTMF frequencies, pre-emphasis and level / melody generator, and mutes are programmable through the serial bus.




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