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IL34119 Datasheet(PDF) 3 Page - Integral Corp. |
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IL34119 Datasheet(HTML) 3 Page - Integral Corp. |
3 / 6 page IL34119 3 line powered speakerphone, for example, will require more filtering than a circuit powered by a well requlated power supply. The amount of rejection is a function of the capacitors, and the equivalent impedance looking into FC1 and FC2 (listed in the Electrical Characteristics as RFC1 and RFC2). In addition to providing filtering, C1 and C2 also affect the turn-on time of the circuit at power-up, since the two capacitors must change up through the internal 50 K Ω and 125 KΩ resistors. CHIP DISABLE The Chip Disable (Pin 1) can be used to power down the IC to conserve power, or for muting, or both. When at a Logic “0” (0 to 0.8 Volts), the IL34119 is enabled for normal operation. When Pin 1 is at a Logic “1” (2.0 to VCC Volts), the IC is disabled. If Pin 1 is open, that is equivalent to a Logic “0”, although good design practice dictates that an input should never be left open. Input impedance at Pin 1 is a nominal 90 K Ω. The power supply current (when disabled) is shown in Figure 1. Muting, defined as the change in differential gain from normal operation to muted operation, is in excess of 70 dB. The turn-off time of the audio output, from the application of the CD signal, is <2.0 µs, and turn on-time is 12-15 ms. Both times are independent of C1, C2, and VCC. When the IL34119 is disabled, the voltages at FC1 and FC2 do not change as they are powered from VCC. The outputs, VO1 and VO2, change to a high impedance condition, removing the signal from the speaker. If signals from other sources are to be applied to the outputs (while disabled), they must be within the range of VCC and Ground. POWER DISSIPATION Figures 2-4 indicate the device dissipation (within the IC) for various combinations of VCC, RL, and load power.The maximum power which can safely be dissipated within the IL34119 is found from the following equation: PD = (140°C - TA)/θJA where TA is the operating temperature; and θ JA is the package thermal resistance (100°C/W for the standard DIP package, and 180 °C/W for the surface mount package). The power dissipated within the IL34119, in a given application, is found from the following eguation: PD = (VCC x ICC) + (IRMS x VCC) - (RL x IRMS 2). where ICC is obtained from Figure 1; and IRMS is the RMS current at the load; and RL is the load resistance. Figures 2-4, along with Figures 5-7 (distortion curves), and a peak working load current of ±200 mA, define the operating range for the IL34119. The operating range is further defined in terms of allowable load power in Figure 8 for load of 8.0 Ω, 16 Ω, and 32 Ω. The left (ascending) portion of each of the three curves is defined by the power level at which 10% distortion occurs. The center flat portion of each curve is defined by the maximum output current capability of the IL34119. The right (descending) portion of each curve is defined by the maximum internal power dissipation of the IC at 25 °C. At higher operating be reduced according to the above equations. Operating the device beyond the current and junction temperature limits will degrade long term reliability. LAYOUT CONSIDERATIONS Normally a snubber is not needed at the output of the IL34119, unlike many other audio amplifiers. However, the PC board layout, stray capacitances, and the manner in which the speaker wires are configured, may dictate otherwise. Generally the speaker wires should be twisted tightly, and be not more than a few inches in length. MAXIMUM RATINGS * Symbol Parameter Value Unit VCC Supply Voltage 1.0 to +18 V IOUT Maximum Output Current at VO1, VO2 ±250 mA VIN MaximumInput Voltage(FC1, FC2, CD, VIN) -1.0 toVCC +1.0 V VVO Applied Output Voltage to VO1, VO2 when disabled -1.0 toVCC +1.0 V Tstg Storage Temperature Range -65 to +150 °C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. |
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