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| U4087B Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone Description The voice switch interface circuit U4087B is a linear integrated circuit for improvement of handsfree performance of U4090B system. The U4087B provides an optimized interface to U4090B, the necessary level detectors and switching control for a properly operating speakerphone. The detection sensitivity and timing are externally controllable. Additionally, the U4087B provides a back- ground noise monitor which makes the circuit insensitive to room noise. The Block diagram shows level detectors, back ground noise monitor. Due to low voltage operation it can be operated via power supply management of U4090B requiring 1.0 mA typ. Features D D D D D Low voltage operation: 3.0 to 7.0 V Four point signal sensing Monitoring system for background noise level Case: SO 16 Chip Disable for active/standby operation Benefits D Fast channel switching allows quasi duplex operation D Low current consumption Block Diagram TLO2 16 TLI2 15 Logic Noise detector CPT 14 VB 7 VM 13 CD GND 6 5 TLO1 2 Logic 1 TLI1 Bias = + - - + TS DIRE Logic DIRA Charge RLI2 9 Logic 8 RLO2 12 CT C.T. Generator 10 TLDR 11 TLDT Discharge - + Logic 3 RLO1 4 RLI1 12610 Figure 1. Block diagram with external circuit TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 1 (8) Preliminary Information U4087B 2 (8) VB VM CD GND C2 15 TLO2 16 15 Logic Noise detector 1 14 7 13 6 Logic 5 2 TLI1 R2 100 nF ST 5.1 kW C 4 - + DIRE TS CPT 300 k W VB VM CD GND TLO1 C2 15 mF 2.2 mF R1 C3 mF 100 nF R5 TLI2 Bias MICO C 10 3.6 k W = Logic + - Charge 9 Logic 8 RLO2 C8 2.2 C7 4.7 12 CT C.T. Generator 10 TLDR 11 TLDT C6 DIRA - + Discharge 4 Logic 3 RLO1 12611 47 nF Figure 2. Application for hands-free operation Preliminary Information mF mF TLDR TLDT 2.2 R4 RLI2 RLI1 R3 47 nF RECO SAO C9 8.2 k W 30 k W C 5 TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 mF VM hook switch C2 R1 13 V to STIN 1 3 33 8 34 VM 4 2 42 28 27 16 15 Q1 C9 30 29 26 12 22 18 24 23 25 35 36 41 39 40 38 37 43 C10 C13 R 10 R11 STIN 2 (Option) Earpiece VM C12 VM R9 R8 C11 BC177 STN VB VL LOGTX R21 VMP 19 R7 L1 20 17 32 R6 9 6 R5 28 V 44 21 31 7 10 11 14 13 5 to m C C8 R3 R4 Tip C7 C3 R2 R25 DTMF R24 C25 C1 C4 C6 C5 R26 C23 HF-Mic C24 Micro- phone Ring TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 U4090B R14 R13 R12 Micro- controller R23 R22 C21 R18 TLDR TLDT R29 Loud speaker C16 Figure 3. Application for handsfree operation Preliminary Information C15 VM R17 C14 R16 R15 U4087B 95 9679 3 (8) U4087B Typical Value of External Components C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 L1 R1 R2 100 nF 4.7 nF 10 mF 220 mF 47 mF 470 mF 820 nF 100 mF 100 nF 150 nF 68 nF 33 nF 10 mF 100 nF 1 mF 47 mF 10 mF 10 mF 68 nF 68 nF 1 mF 100 nF 6.8 nF 10 nF 100 nF 2.2 mH 27 kW 20 kW R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R31 > 68 kW 10 W 1.5 kW 62 kW 680 kW 22 kW 330 W 3 kW 62 kW 30 kW 62 kW 120 kW 47 kW 1 kW 1.2 W 30 kW 6.8 kW 6.8 kW 15 kW 330 kW 220 kW 68 kW 2 kW 3.3 kW 18 kW 2 kW 56 kW 4 (8) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 U4087B Pin Description Pin 1 2 3 4 5 6 Symbol TLI1 TLO1 RLO1 RLI1 GND CD Function Transmit level detector input on the line side Transmit level detector output on the line side Receive level detector output on the line side Receive level detector input on the line side Ground Chip Disable A logic low (< 0.8 V) sets normal operation. A logic high (> 2.0 V) disables the IC to conserve power. Input impedance is nominally 90 kW. Supply voltage 2.8 to 7.0 V, approx. @ 1 mA Receive level detector output on the microphone/speaker side Receive level detector input on the microphone/speaker side Positive control output for U4090B Negative control output for U4090B Response time An RC at this pin sets the response time for the circuit to switch modes It is a system ac ground, supplied by U4090B, VM VB/2 An RC at this pin sets the time constant for the transmit background monitor Transmit level detector input on the microphone/speaker side Transmit level detector output on the microphone/speaker side, and input to the transmit background monitor 7 8 9 10 11 12 13 14 15 16 VB RLO2 RLI2 TLDR TLDT CT VM CPT TLI2 TLO2 X Absolute Maximum Ratings Reference point Pin 1, Tamb = 25C, unless otherwise specified Parameters Supply voltage Voltages: Storage temperature range Junction temperature Ambient temperature range Power dissipation Tamb = 60 C Maximum thermal resistance Junction ambient Pin 7 Pin 6 Pin 13 Symbol VB Value - 0.3 to + 12 - 0.3 to 6 - 0.3 to (VB + 0.3) - 55 to + 150 125 - 20 to + 60 750 110 Unit V V C C C mW K/W Tstg Tj Tamb SO 16 SO 16 Ptot RthJA Operation Recommendation Parameters Supply voltage CD input Pin 6 Ambient temperature range Test conditions / Pin Pin 7 Symbol VB Tamb Min. 3.0 0 - 20 Typ. - - - Max. 7.0 VB + 60 Unit V V C TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 5 (8) Preliminary Information U4087B Electrical Characteristics Tamb = + 25C, VS = 5.0 V, CD Parameters Power supply Supply current CD input resistance CD input voltage Attenuator control CT voltage v 0.8 V unless otherwise specified , Test conditions / Pin VB = 6.5 V, CD = 0.8 V VB = 6.5 V, CD = 2.0 V VB = VCD = 6.5 V - High - Low Pin 12 - VM R mode Idle mode T mode R mode T mode Symbol IB RCD VCDH VCDL VCT Min. Typ. 1.0 60.0 90.0 Max. 2.0 150.0 VB 0.8 Unit mA mA 50.0 2.0 0.0 kW V CT source current CT sink current CT idle current Level detectors and background noise monitor Source current at RLO1, RLO2, TLO1, TLO2 Sink current at RLO1, RLO2, TLO1, TLO2 CPT output resistance IO = 1.0 mA CPT leakage current ICTR ICTT ICTS ILSO ILSK RCP ICPLK - 85.0 + 40.0 + 240.0 0.0 - 240.0 - 60.0 + 60.0 0.0 - 2.0 4.0 100 - 0.2 mV - 40.0 + 85.0 mA mA mA mA mA W mA Ordering Information Type U4087B-FP SO16 Package 6 (8) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 U4087B Dimensions in mm Package: SO16 94 8875 TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 7 (8) Preliminary Information U4087B Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423 8 (8) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 |
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