TECHNICAL NOTE Audio Accessory IC Series Band-pass Filter for Spectrum Analyzer Indication BA3835F, BA3830F, BA3834F z Description As BA3835F, BA3830F, and BA3834F contain band pass filters for spectrum analyzer, external mount parts can be significantly reduced enabling compact unit size and high reliability. z Features 1) Built-in band pass filter for spectrum analyzer. BA3835F has 5 bands filters, BA3830F has 6 bands filters, and BA3834F has 7 bands filters. 2) BA3834F and BA3835 have an integrated multiplexer circuit. Controlled by a microcontroller, detection level is serially output with DC level. 3) BA3830F output for recording indicator. Detection level is parallel output in DC. 4) Support 5V microcomputer bus 5) SOP18 package with few external parts z Applications Car audio, mini audio stereo systems, and CD radio cassette players. z Product lineup Item BA3835F BA3830F BA3834F Number of Band 5 6 7 Center frequency of the band 68,170,420,1K,2.4K, 105,340,1K,3.4K,10.5K 63,150,330,1K,3.3K,10K pass filter (Hz) 5.9K,14.4K Power voltageV 4.56.5 4.58 4.56.5 Output type Serial output Parallel output Serial output Working temperature range -25 ~ +75 -25 ~ +75 -25 ~ +75 Package SOP18 SOP18 SOP18 Ver.B Oct.2005 z Absolute maximum ratings (Ta = 25C) Parameter Symbol Limits Unit BA3834F,BA3835F 7 Power supply Vcc V voltage BA3830F 9 Power dissipation Pd 450* mW Operating temperature Topr -25+75 Storage temperature Tstg -55+125 Reduced by 4.5 mW/C over 25C z Recommended operating conditions (Ta = 25C) Parameter Symbol Min.Typ.Max.Unit Power supply BA3834F,BA3835F 4.5 5.0 6.5 Vcc V voltage BA3830F 4.5 8.0 z Electrical characteristics BA3835F (unless otherwise noted, Ta25V 5VR 10M,V 30dBVSEL1) CC L AIN Parameter Symbol Min.Typ.Max.Unit Conditions Circuit current I 8.5 13 mA V = 0V, A, B, C, SEL = 0 CC AIN Maximum output level V 4.0 4.8 V V = -14dBV, Measured at each output OM AIN V = 0V, SEL = 0/1 AIN Output offset voltage V 30 150 mV OS Measured at each output (cycle time : Ts=50ms) Standard output level 1 V 0.65 1.35 1.70 V f =105Hz, A=0, B=0, C=1 01 IN Standard output level 2 V 0.65 1.35 1.70 V f =340Hz, A=0, B=1, C=0 02 IN Standard output level 3 V 0.65 1.35 1.70 V f =1kHz, A=1, B=0, C=0 03 IN Standard output level 4 V 0.65 1.35 1.70 V f =3.4kHz, A=1, B=1, C=0 04 IN Standard output level 5 V 0.65 1.35 1.70 V f =10.5kHz, A=1, B=1, C=1 05 IN Input impedance R 80 100 120 f =1kHz IN IN Common-mode rejection ratio CMRR 25 50 dB f =1kHz, V =V IN AIN CIN Logic input high level V 2.5 5.0 V IH Not Applicable in the when item 3 of the Logic input low level V 0 0.5 V IL operation notes applies. 1 Output response time* T 5 10 s O 2 Discharge level DL 3 dB Reset pulse within T =10s (Typ.)* R *1 The time from the rise of A, B, C or SEL until the rise of AOUT (90% of peak). If the output selection time is less than this, the output value is not guaranteed and the reset pulse is not generated. *2 Automatically generated intemally based on the output select signal. For the duration that this signal is H, a resistor is connected to the peak hold capacitor, and the output level drops by -3dB (typ.) for one pluse, *3 The Q of the bandpass filter is 3.5. Not designed for radiation resistance. 2/16