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參數(shù)資料
| 型號(hào)： | BH76909GU-E2 |
| 廠商： | Rohm Semiconductor |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO DRIVER CAP-LESS 8WLCSP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 應(yīng)用： | 驅(qū)動(dòng)器 |
| 電路數(shù)： | 1 |
| 電流 - 電源： | 17mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 3.45 V，±1.25 V ~ 1.725 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WLCSP |
| 供應(yīng)商設(shè)備封裝： | 8-WLCSP |
| 包裝： | 帶卷 (TR) |
Technical Note
6/16
BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU
www.rohm.com
2009.03 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
3) Configuration of BH769xxGU and BH76706GU
As shown in Fig. 6, a BH769xxGU or BH76706GU is a dual-supply amplifier and charge pump circuit integrated in one IC.
Accordingly, while there is +3 V single-supply operation, since a dual-supply operation amplifier is used, an output
coupling capacitor is not needed.
4) Input pin format and sag characteristic
While a BH769xxGU or BH76706GU is a low voltage operation video driver, since it has a large dynamic range of
approximately 5.2 Vpp, a resistance termination method that is compatible regardless of signal form (termination by 150
k
) is used, and not a clamp method that is an input method exclusively for video signals.
Therefore, since a BH769xxGU or BH76706GU operates normally even if there is no synchronization signal in the input
signal, it is compatible with not only normal video signals but also chroma signals and R.G.B. signals and has a wide
application range.
Moreover, concerning sag (lowering of low band frequency) that occurs at the input pin and becomes a problem for the
resistance termination method, since the input termination resistor is a high 150 k
, even if it is combined with a small
capacity input capacitor, a sag characteristic that is not a problem in actual use is obtained.
In evaluating the sag characteristic, it is recommended that you use an H-bar signal in which sag readily stands out.
(Fig.
8 to Fig. 10)
Vcc +3V
+
－
Charge current
Flying capacitor
Vcc +3V
+
－
Charge current
Flying capacitor
－
+
Charge current
-Vcc occurs
－
Vcc +3V
－
+
－
-Vcc
occurs
+
Charge shifting mode
Charging mode
SW1
SW2
SW1
Anchor
Capacitor
Anchor Capacitor
Fig.5
Principles of Charge Pump Circuit
1-chip integration
Dual-supply amplifier
Charge pump
VCC
-VCC
75Ω
1μF
150k
AMP
Charge pump
Fig.6
Configuration Diagram of BH769xxGU or BH76706GU
Although single-supply,
output capacitor is not needed.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| BH76912GU | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low voltage operation video driver with LPF |
| BH76912GU-E2 | 制造商:ROHM Semiconductor 功能描述:SINGLE OUTPUT VIDEO DRIVER - Tape and Reel 制造商:ROHM Semiconductor 功能描述:IC VIDEO DVR SGL 12DB 8-VCSP 制造商:ROHM Semiconductor 功能描述:VIDEO DRIVER SINGLE OUTPUT |
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