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U4082B-MFLG Datasheet(PDF) 1 Page - ATMEL Corporation |
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U4082B-MFLG Datasheet(HTML) 1 Page - ATMEL Corporation |
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1 / 30 page  Features • Low-voltage Operation 3V to 6.5V • Attenuator Gain Range Between Transmit and Receive: 52 dB • Four-point Signal Sensing for Improved Sensitivity • Monitoring System for Background Noise Level • Adjustable Microphone Amplifier Gain • Mute Function • Chip Disable for Active/Standby Operation • On-board Filter • Dial Tone Detector • Compatible with U4083B Speaker Amplifier Benefits • Fast Channel Switching Allows Quasi-duplex Operation • Proper Operation in Noisy Surroundings 1. Description The low-voltage voice-switched speakerphone circuit, U4082B, incorporates a wide range of functions. The versatility of the device is further enhanced by giving access to internal circuit points. The block diagram (see Figure 1-1) shows amplifiers, level detectors, transmit and receive attenuators operating in complementary functions, background noise monitors, chip disable, dial tone detector and mute function. Due to low-voltage operation, the device can be operated either by a low supply or via a tele- phone line requiring 5.5 mA typically. Stand-alone operation is enabled by a coupling transformer (Tip and Ring) or in conjunction with a handset speech network, as shown in Figure 1-2 on page 2. Figure 1-1. Block Diagram 10 11 12 16 Level Detectors 18 19 4 28 3 400 Ω 15 14 17 Attenuator Control AGC T Attenuator - + 98 7 - + 6 - + Dial Tone Detector 20 22 21 5 27 23 25 24 +- 13 26 1 2 +1 Filter R Attenuator U4082B Background Noise Monitor Background Noise Monitor Level Detectors PD HTO+ HTO- CD HTI FI TLI2 CPT RI VCI MIC MUTE MICO TI TO CT VB TLI1 RLI2 RECO RLO1 GND RLO2 TLO1 RLI1 TLO2 CPR V S V B V B V B V S V B Low-voltage Voice-switched IC for Hands-free Operation U4082B Rev. 4743D–CORD–03/06 |
Similar Part No. - U4082B-MFLG |
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Similar Description - U4082B-MFLG |
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