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TEA7089AFP Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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TEA7089AFP Scheda tecnica(HTML) 5 Page - STMicroelectronics |
5 / 17 page ELECTRICAL SPECIFICATIONS (continued) AC Characteristics (Tamb =25 °C; RL = 600Ω ; Logic in Default Mode unless otherwise noted) Symbol Parameter Test Conditions Min. Typ. Max. Unit R1 Return Loss Test 2, IL = 22mA f = 300/3400Hz, VAC = -10dBV 17 dB Transmit Characteristics (Tamb =25 °C; RL = 600Ω ; f = 1kHz ; Logic in Default Mode unless otherwise noted) Symbol Parameter Test Conditions Min. Typ. Max. Unit Gtx Gtxl Gtxs Microphone Gain Test 3, Vm = -55dBV R8 = 1.3k Ω, R25 = 3.9kΩ IL = 22mA IL = 90mA 45 38 46 40 47 42 dB dB Zmic Microphone Input Impedance between MIC1 & MIC2 32 40 48 k Ω Ntx Noise Test 3, 2k Ω on microphone inputs, IL = 22mA -76 dBmp Mmic Microphone Mute Test 3, Vm = -55dBV, IL = 22mA 60 dB Dtx VL Max. Soft Clipping - Distortion - Maximum Level on Line Test 3, IL = 22mA, see Figure 2 Vm = -41dBV Vm = -34dBV 1.5 2% Vp The maximum gain Gtl is adjustable between 44 and 56dB with R8 : Gtxl = 20log 820 ⋅ R10 // RL + R11 R8 // 50k Ω The AGC variation is programmed with one resistor connected on Pin AGC. ISL is the line current at which the gain must be decreased by 6dB. R25 (Ω) = 300 ISL − 5mA (R25 > 2.6k Ω) For line current lower than ILL or higher than ISL, The transmit and receive gains have a constant value. If no resistor or a resistor higher than 300k Ω is connected on Pin AGC, the gain is constant and equal to Gtxl and Grxl. ±0.5dB. AGC can be inhibited also through MCU code ”010100”. In this case Tx and Rx gains are fixed 2dB lower than the maximum gain. The minimum saturation voltage of the TEA7089A respect to ground is 2.2V. On long line, when the voltage over TEA7089A is low, the softclipping function automatically limits the AC dynamic to avoid to reach the 2.2V limit on TEA7089A respect to ground. 0.1 1 10 100 0.1 1 10 Thre s hold Leve l V microph on e peak ( m V) -2 -5 -10 -15 Figure 2 : Softclipping 0 20 4 06 08 0 10 0 0 2 4 6 10 V AC p eak I L (mA) 8 V AC p eak Figure 3 TEA7089A 5/17 |
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