TS34118

TS34118 Voice Switched Speakerphone Circuit SOP-28 DIP-28 Supply Voltage Range -1.0 V to 7.0V IVB Current 500µA Microphone Amplifier, & Hybrid Amplifier Gain 40 dB 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-powered applications (3.0-6.5V). 4-point signal sensing for improved sensitivity. Back ground noise monitors for both transmit and receive paths. Standard 28-pin plastic DIP package and SOP package available. Microphone amplifier gain set by external resistors-mute function included. Chip disable for active/standby operation. On board filter pinned-out for user defined function. Dial tone detector to inhibit receive idle mode during dial tone presence. Compatible with TS34119 speaker amplifier. Ordering Information Part No. TS34118CD TS34118CS Operating Temp. o -20 ~ +70 C Package DIP-28 SOP-28 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 o C TS34118 1-20 2004/09 rev. B 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 ℃ Electrical Characteristics (TA=+25, 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=+25℃) 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