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TEA1096A 数据表(PDF) 9 Page - NXP Semiconductors |
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TEA1096A 数据表(HTML) 9 Page - NXP Semiconductors |
9 / 32 page November 1994 9 Philips Semiconductors Product Specification Speech and listening-in IC TEA1096; TEA1096A The function of the current switch TR1-TR2 is to reduce distortion of large line signals. Current ISUP is supplied to VBB via TR1, when VSLPE is higher than VBB + 0.4 V. When VSLPE is lower, this current is shunted to VEE via TR2. All excess line current, not used for internal supply is consumed in the VBB stabilizer or directly shunted to VEE. To reduce the current consumption during pulse dialling, the TEA1096/TEA1096A are provided with a power-down (PD) input. The PD input has a pull-down structure. When the voltage on PD is HIGH, the current consumption from VDD capacitor CVDD is 100 µA and from the VBB supply point 350 µA. The capacitors CVDD (100 µF) and CVBB (470 µF) are sufficient to power theTEA1096/TEA1096A during pulse dialling/flash. VBB voltage adjustment: pin VBA (TEA1096 only) A resistor connected between pins VBA and VEE can be used to increase the VBB voltage, whereas a resistor connected between pins VBA and VBB will decrease the VBB voltage. When adjusting the VBB voltage to a higher value, care should be taken that VSLPE is at least 0.4 V higher than VBB (VBB supply efficiency). Sending channel: pins MICP, MICM, DTMF, GAS, OSP, LN, MUTE, DLS and AGC The TEA1096/TEA1096A has symmetrical microphone inputs MICP, MICM with an input resistance of 64 k Ω between MICP and MICM (2 × 32 kΩ). In the speech mode (MUTE = LOW), the overall gain from MICP-MICM to LN can be adjusted from 33 dB to 52 dB to suit specific requirements. The gain is proportional to the value of RGAS and equals 52 dB with RGAS = 90.9 kΩ and Iline = 20 mA. A capacitor CGAS connected in parallel with RGAS can be used to provide a first-order low-pass filter. Automatic gain control (AGC) is provided for line-loss compensation as well as dynamic limitation for reduction of the distortion of the transmitted signal on the line. The microphone amplifier can be disabled by short-circuiting pin DLS to VEE (secret function) and can be muted into DTMF mode by applying a HIGH level on pin MUTE. The TEA1096/TEA1096A has an asymmetrical DTMF input with an input resistance of 20 k Ω. In the DTMF mode, the overall gain from DTMF to LN is proportional to RGAS, and is 26.5 dB less than the microphone amplifier gain. Switch-over from one mode to the other is click-free. Fig.6 Sending channel. |
类似零件编号 - TEA1096A |
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类似说明 - TEA1096A |
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