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PBL38812 Dataheets PDF



Part Number PBL38812
Manufacturers Ericsson
Logo Ericsson
Description Voice-switch circuit for Handsfree speakerphone TAM
Datasheet PBL38812 DatasheetPBL38812 Datasheet (PDF)

October 1999 PBL 388 12 PBL 388 12 Voice-switch circuit for Handsfree speakerphone TAM Description The PBL 388 12 contains all the necessary circuitry, amplifiers, detectors, comparators and control functions to implement a high performance, voice-switched, ”hands-free ” function in an answering machine. The gain dynamics (attenuation between channels) is settable (25dB or 50dB) via CTR pin that also control two mute levels. A background noise detector in the transmitting channel reduces the i.

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October 1999 PBL 388 12 PBL 388 12 Voice-switch circuit for Handsfree speakerphone TAM Description The PBL 388 12 contains all the necessary circuitry, amplifiers, detectors, comparators and control functions to implement a high performance, voice-switched, ”hands-free ” function in an answering machine. The gain dynamics (attenuation between channels) is settable (25dB or 50dB) via CTR pin that also control two mute levels. A background noise detector in the transmitting channel reduces the influence of continuous noise signals. The PBL 388 12 is designed for answering machines that are either powered from the telephone line or from a mains powered dc. supply. Filtering of both the audio and control signals in both transmitter and receiver channels possible. An external loudspeaker amplifier has to be used, normally the same as used for the answering machine. All figures in this paper refer to 16-pin SO package. Key Features • Settable gain dynamics (25 or 50 dB). • Low power consumption, totally 1.0mA at 3.3V typical. • Background noise compensation in the transmitting channel with hold function. • Exellent noise performance. • Both channel input amplifiers have balanced inputs. • Minimum of external components needed for function. • 16-pin SO and 18-pin DIP encapsulation. 1 5 PBL 388 12 F3 Control F6 12 16 4 6 15 13 11 P B L 38 8 16-pin SO + F2 F5 2 3 – F1 + 8 7 9 10 F4 + Ref. P 14 B L 18-pin DIP Figure 1. Block diagram. ( SO - package ) 38 8 12 12 1 PBL 388 12 Maximum Ratings Parameter Speech switch supply current Voltage pin 1-14 Operating temperature Storage temperature Symbol ID TAmb TStg Min -0,5 -20 -55 Max 10 Vpin 15+0.5 +70 +125 Unit mA V °C °C RxDetin 11 100nF ID + 15 V + V+ GND 16 PBL 388 12 RxDetout 10 V Ref Figure 2. Isolation and measurement of VRef. Reference figure No.2. V+ ID + V Txout R Txout 10 µF + + 100µF/16V 15 V+ 5 Tx out GND 16 Rxout 12 Rx Detin 11 10 µF + V Rxout R Rxout 6 Tx Detin F2 out R F2 out 10 µF + C Tx 4 F2 out + PBL 388 12 C Rx F5 out 13 1 µF I Rxin + 10 µF + F5 out R F5 out I Txin 4.7 µF 3 +Tx in 2 -Tx in N Det 8 Tx Detout 7 0,1µF V Txin 1 µF + CMP 9 C RxDet Rx Detout 10 + CTR 1 -Rx in 14 C TxDet + V Rxin R CTR I CTR NDet I TxDet V TxDet I RxDet V CMP V NDet VRxDet V CTR Figure 3. Test circuit. Reference figure No. 3. 2 PBL 388 12 Electrical Characteristics f = 1 kHz, T = 25°C, RCTR=0, CTxDet = 0, RTxout = ∞, RRxout= ∞, RF2out= ∞, RF5out= ∞, RTx= 0, RRx= 0, CRxDet = 0 and ID=1.0mA unless otherwise noted. Parameter Speech control section Terminal voltage, V+ Internal reference voltage, VRef Frequency response for all amplifiers Transmit gain, 20 • 10 log(VTxout /VTxin) Ref. fig. 3 2 3 3 Condition ID = 1.0mA 200 - 3400 Hz, Relative 1 kHz VCMP = VRef - 0.1 V VCMP = VRef + 0.1 V VCMP = VRef - 0.1 V RCTR=100k, VCTR=V+ VCMP = VRef + 0.1 V RCTR=100k, VCTR=V+ VCMP = VRef + 0.1 V VCMP = VRef - 0.1 V VCMP = VRef + 0.1 V RCTR=100k, VCTR=V+ VCMP = VRef - 0.1 V RCTR=100k, VCTR=V+ VTxDet < 200 mVp , CTx = 100nF VCMP = VRef - 0.1 V VCMP = VRef + 0.1 V VRxDet < 200 mVp , CTx = 100nF VCMP = VRef +0.1 V VCMP = VRef - 0.1 V VCMP = VRef - 0.1 V, CTxdet=1µF VCMP = VRef + 0.1 V, CTxdet=1µF -1 41.5 41.5 26.5 26.5 Min. Typ. 3.3 1.96 1 44 -6 44 19 29 -21 29 4 67.5 42.5 53 28 6.0 Hold 100 3.0 20 -3.5 21.5 -18.5 6.5 Max. Unit. V V dB dB dB dB dB dB dB dB dB dB dB dB dB dB 120 3.6 24 kΩ kΩ kΩ kΩ kΩ kΩ kΩ mVp mVp dBpsof dBA mA mA µA µA V V mA µA Receive gain, 20 • 10 log(VRxout /VRxin) 3 Max transmit detector gain, 20 • 10 log(VTxdet /VTxin) Max receive detector gain, 20 • 10 log(VRxdet /VRxin) 3 37 3 22.5 Background noise rectifier gain, (note 1) 3 + TxIn input impedance - TxIn input impedance - RxIn input impedance TxOut ac, load impedance RxOut ac, load impedance F2Out ac, load impedance F5Out ac, load impedance Transmitter channel output swing, vTxOut Receiver channel output swing, vRxOut Transmitter output noise, vTxOut Receiver output noise, vRxOut TxDet sink current, ITxDetOut RxDet source current, IRxDetOut TxDet source current, ITxDet RxDet sink current, IRxDetOut TxDet swing relative to VRef , VTxDetOut RxDet swing relative to VRef , VRxDetOut NDet sink current (fast charge), INDet NDet source current, INDet 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 80 2.4 16 10 10 10 10 2% distortion,RTxout=RRxout=25k Ω 2% distortion,RTxout=RRxout=25k Ω VCMP = VRef - 0.1 V, vTxIn = 0 V VCMP = VRef + 0.1 V, vRxIn = 0 V VTxDetIn = VRef + 0.1 V VRxIn = VRef - 0.1 V VCMP = VRef - 0.1 V VRxDetIn = VRef + 0.1 V VTxDetIn = VRef + 0.1 V VRxDetIn = VRef - 0.1 V VTxDetIn = VRef - 0.1 V VCMP = VRef - 0.1 V VTxDetIn = VRef + 0.1 V VCMP = VRef + 0.1 V 2.5 -30 (note 2) (note 2) 500 500 -75 -75 -6.0 6.0 -2.5 30 -0.7 +0.7 -4.5 5 -1.5 7 3 3 PBL 388 12 Parameter NDet leakage current (hold), INDet NDet swing relative to VRef , VNDet CMP (comparator) sensitivity, transmit (Tx) mode to receive (Rx) mode or vice versa CTR voltage for 25 dB dynamics, VCTR .


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