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PBL388131N Datasheet(PDF) 1 Page - Ericsson |
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PBL388131N Datasheet(HTML) 1 Page - Ericsson |
1 / 16 page January 1998 Figure 1. Block diagram. 24 pin DIP PBL 388 13 Voice-switched Speakerphone Circuit with built in loudspeaker amplifier 24 pin SO Description. 1 The PBL 388 13 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance, voice-switched, loudspeaking, ”hands-free ” telephone. The gain dynamics (attenuation between channels) is selectable (25dB or 50dB) via a separate pin. A background noise detector in the transmitting channel reduces the influence of continuous external noise signals to the switching . The PBL 388 13 is designed for telephone systems that are either powered from the telephone line or from a mains powered constant voltage dc. supply. The circuit contains a transformerless audio power amplifier with a current supply circuitry (patented) that eliminates the need of inductors. Automatic volume attenuation in the power amplifier extends the operating range at low line currents. A special feature in this circuit is that the power amplifier volume control can be implemented either as an ac. potentiometer control or as a digital control by a µ-processor (dc. control). Filtering is possible of both, the audio and the speech switching control signals, in both transmitter and receiver channels. Key Features • Minimum of external components needed for function. • Selectable gain dynamics. (25 or 50 dB) • Direct telephone line powered solution (patented). • Low power consumption: ≈1mA at 3.3V (typical) for speech switching, audio power amplifier quiscent current ≈1mA. • Drives an 25 - 50 ohm loudspeaker without a transformer. • Background noise compensation in the transmitting channel with hold function at receive. • Input amplifiers of both channels have balanced inputs. • Exellent noise performance. • Encapsulated in 24 pin plastic ”skinny” DIP and 24 pin SO . + F2 F3 F6 F5 – F1 PBL 388 13 F4 22 21 3 1 2 76 8 9 13 14 11 23 16 17 18 20 24 4 + + – – + 19 10 12 Ref. 5 15 Control |
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