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BA3835S

Rohm
Part Number BA3835S
Manufacturer Rohm
Description Band-pass filter for spectrum analyzer
Published Apr 1, 2005
Detailed Description Audio ICs Band-pass filter for spectrum analyzer BA3835S / BA3835F The BA3835S and BA3835F are 5-band, band-pass filter...
Datasheet PDF File BA3835S PDF File

BA3835S
BA3835S

Overview
Audio ICs Band-pass filter for spectrum analyzer BA3835S / BA3835F The BA3835S and BA3835F are 5-band, band-pass filter ICs that use microprocessor time division to produce serial output for spectrum analyzer displays.
To minimize the number of external components required and enable compact and reliable designs, all of the capacitors for the filters are on the chip.
FApplications CD radio cassette players, mini-component stereo systems, car stereos FFeatures 1) Five band-pass filter elements for spectrum analyzer displays.
2) High-speed readout (output response time : 5µsec.
Typ.
).
3) Discharge time constant circuit for each band is on the chip.
4) Differential input amplifier rejects common-mode noise.
5) Single 5V power supply.
FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 601 Audio ICs FBlock diagram 1 (BA3835S) BA3835S / BA3835F 602 Audio ICs FBlock diagram 2 (BA3835F) BA3835S / BA3835F 603 Audio ICs BA3835S / BA3835F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, RL = 10MΩ, VAIN = *30dBV and SEL = 1) 604 Audio ICs FMeasurement circuit (BA3835S) BA3835S / BA3835F 605 Audio ICs FOutput select logic table BA3835S / BA3835F FTiming chart 606 Audio ICs FApplication example (BA3835S) BA3835S / BA3835F 607 Audio ICs 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 100kΩ.
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 10kΩ resistor (typ.
) for the output.
Therefore, if the load circuit connected to the A OUT pin has a MOS structure there is no problem (eg.
micr...


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