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BA3834F Fiches technique(PDF) 8 Page - Rohm |
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BA3834F Fiches technique(HTML) 8 Page - Rohm |
8 / 10 page R1 )R R1 )R2)R 20k Ω)R 20k Ω)10kΩ)R 598 Audio ICs BA3834S / BA3834F FOperation notes (1) Frequency characteristics The frequency characteristics of this IC are determined by the resistor connected between the RREF terminal and GND. For the specification conditions, the value of this resistor is 100k Ω. If it is necessary to set the frequency characteristics accurately, use a variable resistor (note: all bands will shift together). (2) Load characteristics To convert the bias sense output signal to the GND sense signal, the IC performs a V / I conversion, and then an I / V conversion using a 10k Ω resistor (Typ.) for the output. Therefore, if the load circuit connected to the AOUT pin has a MOS structure there is no problem (eg. micropro- cessor input port), but if the connected circuit has a low input impedance, it may cause the output level to drop. (3) External resistor for the control pin When using a common port for the output select control and FL drive, you must add a diode and resistor as shown in Fig. 4 to prevent the FL drive “L” voltage from destroy- ing the IC. In this case, the “L” voltage applied to the internal comparator input terminal V1 is given by: V1 = VREF To maintain a noise margin of at least 2.5V with re- spect to the comparator threshold level VREF, the representative values for VREF, R1 and R2 are 1.5V, 20k Ω, and 10kΩ respectively. This gives: 1.5V )0.25Vt1.5V And from this, the following condition is obtained: R t 30kΩ In this case, the “L” level voltage V2 for the IC will be: V2 t 0.75V (4) Recommended operating ranges Provided that the IC is operated within the recommended operating conditions and the recommended temperature range, the basic circuit functions are guaranteed. Within these ranges, ratings for electrical characteristics for conditions other than those stipulated cannot be guaran- teed, but the inherent function of the bandpass filter will be maintained. (5) Application example Provided the recommended circuit constants are used, the application example should function correctly. How- ever, we recommend that you confirm the characteristics of the circuits in actual use and pay due attention to the cautionary notes given below. If you change the circuit constants, check both the static and transient characteristics of the circuit, and allow suffi- cient margin to accommodate variations between both ICs and external components. Note, also, that Rohm has not been able to conduct a sufficient study into patent rights. |
Numéro de pièce similaire - BA3834F |
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Description similaire - BA3834F |
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