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BA6822S

Rohm
Part Number BA6822S
Manufacturer Rohm
Description LED level meter driver/ 12-point x 2 channel/ VU scale/ bar display
Published Apr 1, 2005
Detailed Description Audio ICs LED level meter driver, 12-point channel, VU scale, bar display BA6820F / BA6822S / BA6822F 2 The BA6820F, ...
Datasheet PDF File BA6822S PDF File

BA6822S
BA6822S

Overview
Audio ICs LED level meter driver, 12-point channel, VU scale, bar display BA6820F / BA6822S / BA6822F 2 The BA6820F, BA6822S and BA6822F are two-channel, 12-point LED drivers for VU-scale bar-level meters.
The ICs are available in 22-pin SOP (BA6820F and BA6822F) and 22-pin shrink-DIP (BA6822S) packages, and use a dynamic-drive system that can drive two 12-point displays.
The ICs have independent AC and DC inputs, and the AC input mode has a peak hold circuit (with cancel function).
The ICs also feature a power-on mute, so steps to prevent erroneous LED lighting at power on are not required.
The input resistance of the AC inputs is 3kΩ (Typ.
) for the BA6820F and 0.
3kΩ (Typ.
) for the BA6822S / F.
FApplications Level meters for VCRs, stereo cassette players, audio amplifiers and karaoke equipment.
FFeatures 1) Uses dynamic-drive system to display two 12-point channels.
22-pin SOP and 22-pin shrink DIP packages.
2) Independent AC and DC inputs provided (one input displays one channel).
Switching function allows two-mode display.
3) Upper 8 points have peak hold function in AC mode (two seconds).
A peak-hold cancel function is also provided.
4) A mute function is provided, and muting can be applied externally.
5) Power on mute function.
662 Audio ICs FBlock diagram BA6820F / BA6822S / BA6822F FAbsolute maximum ratings (BA6820F / BA6822F) (Ta = 25_C) (BA6822S) (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 663 Audio ICs BA6820F / BA6822S / BA6822F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5.
0V and f = 1kHz) 664 Audio ICs BA6820F / BA6822S / BA6822F 665 Audio ICs FMeasurement circuit BA6820F / BA6822S / BA6822F FApplication example 666 Audio ICs FAttached components S C1 and C2: 1µF input coupling capacitors (electrolytic) for the square-root compression amplifier.
The rectified voltage output from pins 2 and 4 is attenuated by 1.
5dB at the frequency determined by the following formula (refer to the data for ...


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