MC33215 Motorola, MC33215 Datasheet
MC33215
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MC33215 Summary of contents
Page 1
... Advance Information Telephone Line Interface and Speakerphone Circuit The MC33215 is developed for use in fully electronic telephone sets with speakerphone functions. The circuit performs the ac and dc line termination, 2–4 wire conversion, line length AGC and DTMF transmission. The speakerphone part includes a half duplex controller with signal and noise monitoring, base microphone and loudspeaker amplifiers and an efficient supply ...
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... MUT MC33215 FEATURES Separate Input for DTMF and Auxiliary Signals Parallel Operation Down to 4 Line Current Speakerphone Operation Handsfree Operation via Loudspeaker and Base Microphone Integrated Microphone and Loudspeaker Amplifiers Differential Microphone Inputs Loudspeaker Amplifier can be Powered and Used Separately from the Rest of the Circuit Integrated Switches for Smooth Switch– ...
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... SUPPLY POINT V CC Current Available from 2 line DC Voltage Drop Between VLN and line SUPPLY INPUT VLS Internal Current Consumption from VLS MOTOROLA ANALOG IC DEVICE DATA MC33215 Min Max Unit –0 – 160 mA –0 –0.5 5.5 V –0.5 7 ...
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... MUT = Low MF Output Swing Capability into 150 THD 2% Output Swing Capability into 450 THD 2 360 k RXO NOTE: 1. Corresponding to –0.6 dB gain from the line to output RXO in the typical application. 4 MC33215 Min 2.0 line MODE FORCED) x line EAR 680 1800 = 18 mA, VLS = 2 1000 Hz, ...
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... TSA RSA Envelope Tracking Between TSE and RSE and Between TBN and RBN Maximum Source Current from TSE or RSE NOTE: 2. Corresponding to –0.6 dB gain from the line to output RLS in the typical application. MOTOROLA ANALOG IC DEVICE DATA MC33215 Min MODE FORCED) x LSP 150 110 1 ...
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... SPS Speakerphone Select Input 19 17 PRS Privacy Switch Input 20 18 SWT Switch–Over Timing Adjustment 21 19 LSM Loudspeaker Mute Input 6 MC33215 Min 100 0.7 100 – – – 7.0 7.0 PIN FUNCTION DESCRIPTION D Description i i MOTOROLA ANALOG IC DEVICE DATA = 18 mA, VLS = 2 1000 Hz, ...
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... Loudspeaker Amplifier Feedback Input – 40 N/C Not Connected – 41 N/C Not Connected 39 42 LSB Loudspeaker Amplifier Bootstrap Output 40 43 VLS Supply Input for Loudspeaker Amplifier 41 44 LSO Loudspeaker Amplifier Output 42 45 PGD Power Ground – 46 N/C Not Connected MOTOROLA ANALOG IC DEVICE DATA MC33215 (continued) Description Description 7 ...
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... Based on the typical application circuit as given in Figure 18, the MC33215 will be described in three parts: line driver and supplies, handset operation, and handsfree operation. The data used refer to typical data of the characteristics. LINE DRIVER AND SUPPLIES The line driver and supply part performs the ac and dc telephone line termination and provides the necessary supply points ...
Page 9
... VHF Supply VHF is a stabilized supply which powers the internal duplex controller part of the MC33215, and which is also meant to power the base microphone or other peripherals. The base microphone however, can also be connected to VMC, which is preferred in case of microphones with a poor supply rejection ...
Page 10
... More details on this can be found in the handsfree operation paragraph. HANDSET OPERATION During handset operation, the MC33215 performs the basic telephone functions for the handset microphone and earpiece. It also enables DTMF transmission. Handset Microphone Amplifier The handset microphone capacitively connected to the circuit via the differential input HM1 and HM2 ...
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... Sidetone Cancellation The line driver and the receiver amplifier of the MC33215 are tied bridge configuration as depicted in Figure 7. This bridge configuration performs the so–called hybrid function which, in the ideal case, prevents transmitted signals from entering the receive channel ...
Page 12
... By applying a logic 0 to Pin PRS, the MC33215 enters privacy mode. In this mode, both handset and handsfree microphone amplifiers are muted while the DTMF amplifier is enabled. Through the MFI input, a signal, for example music on hold, can be sent to the line ...
Page 13
... Due to the influence of the line length AGC on the R amplifier, the gain will be reduced for higher line currents. The output stage of the MC33215 is a modified all NPN bootstrap stage which ensures maximum output swing under all supply conditions. The major advantage of this type of output stage over a standard rail– ...
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... In this mode the gain reduction in both channels halfway, leading reduction speakerphone built around the MC33215, following 5.0 6.0 the signal path from base microphone to the line and via sidetone, loudspeaker and acoustic coupling back to the microphone, the loop gain can be expressed as a sum of the gains of the different stages ...
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... The noise envelope voltage then follows in a similar way. Based on the envelope levels, the MC33215 will switch to transmit, receive or idle mode following Table 3. The fact that in receive mode the signal on the base microphone is greater than case of transmit ...
Page 16
... The electrical characteristics and the behavior of the MC33215 are not the only factor in designing a handsfree speakerphone. During the design the acoustics have to be taken into account from the beginning. The choice of the transducers and the design of the cabinet are of great influence on the speakerphone performance ...
Page 17
... PGD R LSO 180 k LSF MOTOROLA ANALOG IC DEVICE DATA MC33215 Figure 17. Test Circuit R REG C C VDD REG 360 k 100 220 n REG VLN DD Supply 1:10 MC33215 MHM Driver 1x 0.2 V AGC MBM MDF T Attenuator DTMF x AGC MHM MBM Logic MDF Control MRX Block MRA M EAR ...
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... C V BVO CC 220 n VLS LSB 25 C LSP LSO LSO 47 Peak Limiter PGD R LSO 180 k LSF R PPL 1 RLS LSI MC33215 Figure 18. Typical Application R REG2 R REG1 Z 365 k bal REG 220 n R REG VLN SLB 2.2 k VMC C VMC 10 VHF Supply 1:10 C VHF 47 V ...
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... B 0.20 (0.008) H A–B M 0.05 (0.002) A–B V 0.20 (0.008) C A– DETAIL C MOTOROLA ANALOG IC DEVICE DATA MC33215 OUTLINE DIMENSIONS FB SUFFIX PLASTIC PACKAGE CASE 848B–04 (TQFP–52) ISSUE –B– DETAIL DATUM – ...
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... MIN MAX MIN MAX A 1.435 1.465 36.45 37.21 B 0.540 0.560 13.72 14.22 C 0.155 0.200 3.94 5.08 D 0.014 0.022 0.36 0.56 F 0.032 0.046 0.81 1.17 G 0.070 BSC 1.778 BSC H 0.300 BSC 7.62 BSC J 0.008 0.015 0.20 0.38 K 0.115 0.135 2.92 3.43 L 0.600 BSC 15.24 BSC 0.020 0.040 0.51 1.02 Mfax is a trademark of Motorola, Inc. MC33215/D ...