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參數(shù)資料
| 型號(hào)： | BA6820 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | LED level meter driver, 12-point x 2 channel, VU scale, bar display |
| 中文描述： | LED電平表驅(qū)動(dòng)器，12點(diǎn)× 2通道，維旺迪規(guī)模，酒吧顯示屏 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 172K |
| 代理商： | BA6820 |
668
Audio ICs
BA6820F / BA6822S / BA6822F
(3)
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.
D
1
to D
4
in the timing chart operate in the same way as
for AC mode (i.e. D
1
and D
2
operate), but O
1
to O
6
are high
for the channel 1 period.
Peak hold
(
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 36k
resistors (between the
base and emitter of Q
1
to Q
4
), so leak current bypass re-
sistors are not required.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA6820F | 制造商:ROHM 制造商全稱:Rohm 功能描述:LED level meter driver, 12-point x 2 channel, VU scale, bar display |
| BA6820F-E2 | 制造商:ROHM Semiconductor 功能描述:LED DRVR 5.5V 40MA 22-PIN SOP T/R - Tape and Reel 制造商:ROHM Semiconductor 功能描述:IC LED DVR 2CH 12POINT 22-SOP 制造商:ROHM Semiconductor 功能描述:LED DRVR 5.5V 40MA 22PIN |
| BA6822F | 制造商:ROHM 制造商全稱:Rohm 功能描述:LED level meter driver, 12-point x 2 channel, VU scale, bar display |
| BA6822F-E2 | 制造商:ROHM Semiconductor 功能描述:IC, 12X2 LEVEL METER DRIVER, 22 PIN SOP /TAPE & REEL - Tape and Reel 制造商:ROHM Semiconductor 功能描述:IC LED DVR 2CH 12POINT 22-SOP 制造商:ROHM Semiconductor 功能描述:IC LVL METER DRIVER 22PIN 12X2 |
| BA6822S | 制造商:Panasonic Industrial Company 功能描述:IC |
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