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TEA1114A датащи(PDF) 9 Page - NXP Semiconductors |
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TEA1114A датащи(HTML) 9 Page - NXP Semiconductors |
9 / 28 page 2000 Mar 21 9 Philips Semiconductors Product specification Low voltage telephone transmission circuit with dialler interface and regulated strong supply TEA1114A Receiving stage (pins IR, RX, GAR and QR) The receive part consists of a receive amplifier and an earpiece amplifier. THE RECEIVE AMPLIFIER (PINS IR AND RX) The receive amplifier transfers the receive signal from input IR to output RX. The input impedance of the receive amplifier, between pins IR and VEE,is20 kΩ. The voltage gain from pin IR to RX is set at 33.4 dB. RX output is intended to drive high ohmic (real) loads. Automatic gain control is provided on the receive amplifier. THE EARPIECE AMPLIFIER (PINS GAR AND QR) The earpiece amplifier is an operational amplifier having its output (QR) and inverting input (GAR) available. It can be used in conjunction with two resistors to get some extra gain or attenuation. In an usual configuration (see Fig.8), output RX drives the earpiece amplifier by means of RE1 connected between RX and GAR. Feedback resistor RE2 of the earpiece amplifier is connected between QR and GAR. Output QR drives the earpiece. The gain of the earpiece amplifier (from RX to QR) can be set between +12 and −14 dB by means of resistor RE2. The preferred value of RE1 is 100 kΩ. The earpiece amplifier offers a gain boost facility relative to the initial gain. Resistor RE2 has to be replaced by the network of RE21, RE22 and RE23 as shown in Fig.8. The initial gain is defined by: which corresponds to RE23 = ∞. The gain boost is realized by a defined value of RE23 and is: Two external capacitors CGAR (connected between GAR and QR) and CGARS (connected between GAR and VEE) ensure stability. The CGAR capacitor provides a first-order low-pass filter. The cut-off frequency corresponds to the time constant CGAR × RE2. The relationship CGARS =10 × CGAR must be fulfilled to ensure stability. The output voltages of both amplifiers are specified for continuous wave drive. The maximum output swing depends on the DC line voltage VLN, the RCC resistor, the ICC current consumption of the circuit, the IP current consumption of the peripheral circuits and the load impedance. R E21 R E22 + R E1 ------------------------------- – R E21 R E22 + R E1 ------------------------------- 1 R E21 // RE22 R E23 ---------------------------------- + × – handbook, full pagewidth MGK808 Iline Rline VCC VEE VEE 0.5VCC QR LN GAR CGAR CGAR CGARS RX CVCC 100 µF 10 µF EARPIECE AMPLIFIER TEA1114A RCC RE2 RE1 ICC REXCH VEXCH RE23 RE21 RE1 100 k Ω RE22 RX GAR QR Addition for gain boost of earpiece amplifier CGARS Fig.8 Earpiece amplifier configuration. |
Аналогичный номер детали - TEA1114A |
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Аналогичное описание - TEA1114A |
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