TS34118 Voice Switched Speakerphone Circuit Pin Definition: SOP-28 1. FO 8. TXO 15. V 22. Gnd B 2. FI 9. TXI 16. CPT 23. TLI1 3. CD 10. MCO 17. TLI2 24. TLO1 4. Vcc 11. MCI 18. TLO2 25. RLO1 5. HTO+ 12. MUT 19. RLO2 26. RLI1 6. HTO- 13. VLC 20. RLI2 27. CPR 7. HTI 14. C 21. RXI 28. GND T General Description The TS34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels. A Dial Tone Detector prevents the dial being attenuated by the Receive background noise monitor circuit. Also included are two line drive amplifiers which can be used to form a hybrid network in conjunction with an external coupling transformer. A high-pass filter can be used to filter out 60Hz noise in the receive channel, or for other filtering functions .A Chip Disable pin permits powering down the entire circuit to conserve power on long loops where loop current is at a minimum. The TS34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5.0mA. The TS34118 can be interfaced directly to Tip and Ring (through a coupling transformer) for stand-alone operation, or it can be used in conjunction with a handset speech network and/or other features of a feature phone Features Ordering Information Improved attenuator gain range: 52dB between Part No. Package Packing transmit and receive. TS34118CS28 C8 SOP-28 25pcs / Tube Low voltage operation for line-power application TS34118CS28 RD SOP-28 1.5kpcs / 13 Reel (3V~6.5V). 4-point signal sensing for improved sensitivity Back ground noise monitors for both transmit and receive paths. Compatible with TS34119 speaker amplifier. Microphone amplifier gain set by external resistors- mute function included. Chip disable for active/standby operation. Absolute Maximum Rating Description Value Unit Supply voltage (pin 4) -1.0, +7.0 V Voltage at CD (pin 3), MUT (pin 12) -1.0,Vcc +1.0 V Voltage at VLC (pin 13) -1.0,Vcc +0.5 V Voltage at TXI (pin 9),RXI (pin 21),FI(pin 2) -0.5,Vcc +0.5 V Storage temperature range -65 to +150 C 1/21 Version: C13 TS34118 Voice Switched Speakerphone Circuit Recommended Operating Conditions Description Min. Typ. Max. Units Supply voltage (pin 4) (see Text) 3.5 -- 6.5 V CD input (pin 3), MUT input (pin 12) 0 -- Vcc V I current (pin 15) - -- 500 A VB VLC (pin 13) 0.3xV -- V V B B Attenuator input signal voltage (pin 9,21) 0 -- 350 mVrms Microphone amplifier, Hybrid amplifier gain 0 -- 40 dB Load current RXO, TXO (pins 8,22) 0 -- 2.0 MCO (pin 10) 0 -- 1.0 mA HTO-, HTO+ (pin 6,5) 0 -- 5.0 Ambient operating temperature range -20 -- +60 C Electrical Characteristics (T =25C, Vcc=5.0V, CD 0.8V, unless noted) A Parameter Symbol Min Typ Max Unit Power Supply Vcc supply current (Vcc=6.5V, CD=0.8V) -- 5.5 8.0 mA Icc (Vcc=6.5V, CD=2.0V) -- 600 800 A CD input resistance (Vcc=V =6.5V) R 50 90 -- K CD CD CD input voltage - High V 2.0 -- Vcc V CDH - Low V 0 -- 0.8 V CDL V output voltage (Vcc=3.5V) -- 1.3 -- B V V B (Vcc=5.0V) 1.8 2.1 2.4 V output resistance (I =1.0mA) R -- 400 -- B VB OVB V power supply rejection ratio (C =220F,f=1.0KHz) PSRR -- 54 -- dB B VB Attenuators (T =+25C) A Receive attenuator gain (f=1.0KHz, V =V ) LC B Rx model, RXI=150mVrms (Vcc=5.0V) G +4.0 +6.0 +8.0 RX Rx model, RXI=150mVrms (Vcc=3.5V) G +4.0 +6.0 +8.0 RX Gain change Vcc=3.5V versus Vcc=5.0V G -0.5 0 +0.5 dB RX1 AGC gain change Vcc=2.8V versus Vcc=5.0V* G -- -25 -15 RX2 Idle model, RXI=150mVrms G -22 -20 -17 RX1 Range (Rx to Tx model) G 49 52 54 RX3 Volume control range (Rx model, 0.3V <V <V ) V 27 35 -- dB B LC B CR RXO DC voltage (Rx model) V -- VB -- V RXO RXO DC voltage (Rx to Tx model) V -- 10 150 mV RXO RXO high voltage (Iout=-1.0mA RXI=V +1.5V) V 3.7 -- -- V B RXOH RXO low voltage (Iout=+1.0mA, RXI=V -1.0, B V -- -1.5 -1.0 V RXOL Output measured with respect to V )* B RXI input resistance (RXI<350mVrms) R 7.0 10 14 K RXI Transmit attenuator gain (f=1.0KHz) Tx model , TXI=150mVrms G +4.0 +6.0 +8.0 TX dB Idle model, TXI=150mVrms G -22 -20 -17 TXI Range (Tx to Rx model) G 49 52 54 TXI TXO DC voltage (Tx model) V -- V -- V TXO B TXO DC voltage (Tx to Rx model) V -- 30 150 mV TXO TXO High voltage (Iout=-1.0mA TXI=V +1.5V) B V 3.7 -- -- V TXOH TXO Low voltage (Iout=+1.0mA TXI=V -1.0V, B V -- -1.5 -1.0 V TXOL Output measured with respect to V )* B 2/21 Version: C13