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BH3541F-E2 Datasheet(PDF) 6 Page - Rohm |
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BH3541F-E2 Datasheet(HTML) 6 Page - Rohm |
6 / 9 page www.rohm.com 2010.05 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. Technical Note 6/8 BH3541F,BH3544F,BH3547F,BH3548F ● Application circuit 5 6 7 8 3 4 VCC OUT2 BIAS IN2 47µ 1µ VIN2 180k (90k) 180k (90k) 0dB (6dB) 0dB (6dB) BIAS MUTE TSD 2 1 OUT1 MUTE IN1 GND 1µ VIN1 1µ 100k 330µ 10 VMUTE H : Active L : Mute 330µ VCC R5 C5 C6 C7 C8 C1 C2 C3 R3 R2 µ + + + + Fig. 15 ● Description of external components. 1) Input coupling capacitors (C3, C5) These are determined according to the lower cutoff frequency fc. Moreover, since lowering the capacitance can cause the occurrence of pop noise, when changing this, determine it after adequate checking. Since the input impedance of the BH3541F is 180kΩ and that of the BH3544F,BH3547F,BH3548F is 90kΩ, these are found by the expressions below, although drift, temperature characteristics, and other considerations are necessary. (Layered ceramic capacitors are recommended.) C3(C5)=1/(2π×180kΩ×fc) [BH3541F] C3(C5)=1/(2π× 90kΩ×fc) [BH3544F,BH3547F,BH3548F] 2) Bias capacitor (C6) When VCC=5V, 47μF is recommended. Since lowering the capacitance too much can cause worsening of electrical characteristics or the occurrence of pop noise, when changing this, determine it after checking this adequately. 3) Mute pin pop noise countermeasures (R2, C2) Since the BH3541F,BH3544F,BH3548F has an impedance of 190kΩ against GND and the BH3547F has 200kΩ, it may be impossible to cancel mute mode if R2 is made too large. 4) Output coupling capacitors (C1, C7) These are determined by the lower cutoff frequency. If RL is the output load resistance (assuming a resistance RX is put in for output protection or current restriction), these are found by the expression below. C1(C7)=1/(2π×(RL+Rx)× fc) 5) Input gain adjustment resistances (R3, R5) (BH3544F,BH3547F) Externally attached resistances (R3, R5) make input gain adjustment possible. The gain found by the expression below can be set. GVC=6+20log(90kΩ/(90kΩ+R3[R5])) [dB] When input gain is not accommodated, these resistors have no use. ● Notes for use 1) Numbers and data in entries are representative design values and are not guaranteed values of the items. 2) Although we are confident in recommending the sample application circuits, carefully check their characteristics further when using them. When modifying externally attached component constants before use, determine them so that they have sufficient margins by taking into account variations in externally attached components and the Rohm LSI, not only for static characteristics but also including transient characteristics. 3) Absolute maximum ratings If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how not to apply the conditions under which absolute maximum ratings are exceeded to the LSI. ( ) are BH3544F, BH3547F, BH3548F values. |
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