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TEA1064A датащи(PDF) 10 Page - NXP Semiconductors |
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TEA1064A датащи(HTML) 10 Page - NXP Semiconductors |
10 / 36 page March 1994 10 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting TEA1064A The DC line voltage on LN is VLN =VLN-SLPE + (ISLPE × R9). Therefore VLN =Vref + ([Ip + 0.25 × 10−3 A] × R15) + ([lline − ICC1 − 0.25 × 10−3 A] × R9) in which: Vref is the internal reference voltage between VCC2 and SLPE (the value of Vref can be adjusted by an external resistor, RVA). Vref = 3.3 V (typ.) without RVA Ip is the supply current used by peripheral circuits R15 is an external resistor between LN and VCC2 (392 Ω in the basic application) R9 is an external resistor between SLPE and VEE (20 Ω in the basic application) The DC voltage VLN-SLPE as a function of Ip with R15 as a parameter is shown in Fig.10. In the audio frequency range, the dynamic impedance is determined mainly by R1. The equivalent impedance in the audio range of the circuit (Fig.8) is shown in Fig.11. Fig.9 Maximum output swing on line as a function of line current with the peripheral supply current as a parameter; R15 = 392 Ω; R16 = 56 Ω. As different values of R15 and R16 are allowed, different curves would then apply handbook, halfpage 10 8 4 6 2 0 20 30 MGR064 Iline (mA) VLN(p-p) (V) Ip = 4 mA 2 mA 0 mA Fig.10 Curves showing the typical voltage drop between LN and SLPE as a function of the supply current for peripherals with R15 as a parameter: VCC2-SLPE = 3.3 V (RVA not connected). VCC2-SLPE can be adjusted between approximately 3.3 and 4.3 V by changing the value of RVA, this results in a parallel-shift of the curves. The total voltage drop VLN ≈ VLN-SLPE + ([Iline − 1.55 mA] × R9). handbook, halfpage 012 4 5.5 3.0 5.0 MGR065 3 4.0 4.5 3.5 Ip (mA) VLN-SLPE (V) R15 = 511 Ω 392 Ω 301 Ω Fig.11 Equivalent impedance between LN and VEE at f > 300 Hz in the application with stabilized supply voltage for peripheral circuits. R eq R p R15 R16 ----------- 1 + = L eq C3 R9 × R eq with Rp 15 k Ω = × = handbook, halfpage MGR066 R9 20 Ω LN C3 470 nF Req Leq VEE R1 620 Ω |
Аналогичный номер детали - TEA1064A |
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Аналогичное описание - TEA1064A |
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