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BA6820 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BA6820은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 BA6820 자료 제공

부품번호 BA6820 기능
기능 LED level meter driver/ 12-point x 2 channel/ VU scale/ bar display
제조업체 ROHM Semiconductor
로고 ROHM Semiconductor 로고


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BA6820 데이터시트, 핀배열, 회로
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 3k(Typ.) for the BA6820F and 0.3k(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 pack-
ages.
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 ap-
plied externally.
5) Power on mute function.
662




BA6820 pdf, 반도체, 판매, 대치품
Audio ICs
BA6820F / BA6822S / BA6822F
665

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BA6820 전자부품, 판매, 대치품
Audio ICs
BA6820F / BA6822S / BA6822F
(3) Peak hold
The peak hold circuit momentarily holds the maximum
signal level in AC input mode. The peak hold function ap-
plies to comparator levels 5 to 12 (8 points). When the os-
cillator frequency is 4kHz, the peak hold time is two se-
conds (Typ.), and can be changed by changing the
oscillator frequency. The peak hold function can be
turned off by setting pin 8 high.
The peak hold function does not operate in DC input
mode.
(4) Output block
The two sets of 12 LEDs for the BA6820F and
BA6822S / F are divided into 4 groups of six. A dynamic-
drive technique is used to drive the LEDs in order, and
display the input level.
Group 1
Channel 1 LEDs 1, 3, 5, 7, 9 and 11
(odd-numbered LEDs)
Group 2
Channel 1 LEDs 2, 4, 6, 8, 10 and 12
(even-numbered LEDs)
Group 3
Channel 2 LEDs 1, 3, 5, 7, 9 and 11
(odd-numbered LEDs)
Group 4
Channel 2 LEDs 2, 4, 6, 8, 10 and 12
(even-numbered LEDs)
Therefore, six LED drive outputs, and four display switch
terminals are provided.
The output timing chart for when all LEDs are lit is shown
in Fig. 3.
In DC input mode, only channel 2 operates.
D1 to D4 in the timing chart operate in the same way as
for AC mode (i.e. D1 and D2 operate), but O1 to O6 are high
for the channel 1 period.
(1) Display switch outputs (pins 12 to 15)
To successively switch between the four LED groups,
these outputs are active low (see Fig. 4).
The outputs are pulled up by 36kresistors (between the
base and emitter of Q1 to Q4), so leak current bypass re-
sistors are not required.
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