TS34118CD28C4

TS34118 Voice Switched Speakerphone Circuit SOP-28 DIP-28 Pin Definition: 1. FO 8. TXO 2. FI 9. TXI 10. MCO 3. C D 4. Vcc 11. MCI 5. HTO+ 12. MUT 6. HTO13. VLC 7. HTI 14. CT 15. VB 16. CPT 17. TLI2 18. TLO2 19. RLO2 20. RLI2 21. RXI 22. Gnd 23. TLI1 24. TLO1 25. RLO1 26. RLI1 27. CPR 28. GND 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 ● ● ● ● ● ● ● Improved attenuator gain range: 52dB between transmit and receive. Low voltage operation for line-power application (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 resistorsmute function included. Chip disable for active/standby operation. Ordering Information Part No. TS34118CS28 C8 TS34118CD28 C4 Package SOP-28 DIP-28 Packing 25pcs / Tube 10pcs / Tube Absolute Maximum Rating Description Supply voltage (pin 4) Voltage at CD (pin 3), MUT (pin 12) Voltage at VLC (pin 13) Voltage at TXI (pin 9),RXI (pin 21),FI(pin 2) Storage temperature range Value -1.0, +7.0 -1.0,Vcc +1.0 -1.0,Vcc +0.5 -0.5,Vcc +0.5 -65 to +150 Unit V V V V ºC 1/23 Version: A08 TS34118 Voice Switched Speakerphone Circuit Recommended Operating Conditions Description Supply voltage (pin 4) (see Text) CD input (pin 3), MUT input (pin 12) IVB current (pin 15) VLC (pin 13) Attenuator input signal voltage (pin 9,21) Microphone amplifier, Hybrid amplifier gain Load current @RXO, TXO (pins 8,22) @MCO (pin 10) @HTO-, HTO+ (pin 6,5) Ambient operating temperature range Min. 3.5 0 0.3xVB 0 0 0 0 0 -20 Typ. ----------- Max. 6.5 Vcc 500 VB 350 40 ±2.0 ±1.0 ±5.0 +60 Units V V µA V mVrms dB mA ºC Electrical Characteristics (TA=25ºC, Vcc=5.0V, CD≤ 0.8V, unless noted) Parameter Power Supply Vcc supply current (Vcc=6.5V, CD=0.8V) (Vcc=6.5V, CD=2.0V) CD input resistance (Vcc=VCD=6.5V) CD input voltage - High - Low VB output voltage (Vcc=3.5V) (Vcc=5.0V) VB output resistance (IVB=1.0mA) VB power supply rejection ratio (CVB=220µF,f=1.0KHz) Attenuators (TA=+25ºC) Receive attenuator gain (f=1.0KHz, VLC=VB ) Rx model, RXI=150mVrms (Vcc=5.0V) Rx model, RXI=150mVrms (Vcc=3.5V) Gain change –Vcc=3.5V versus Vcc=5.0V AGC gain change –Vcc=2.8V versus Vcc=5.0V* Idle model, RXI=150mVrms Range (Rx to Tx model) Volume control range (Rx model, 0.3VB