参数资料
| 型号： | BH76909GU-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/10页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO DRIVER CAP-LESS 8WLCSP |
| 标准包装： | 3,000 |
| 应用： | 驱动器 |
| 电路数： | 1 |
| 电流 - 电源： | 17mA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 3.45 V，±1.25 V ~ 1.725 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WLCSP |
| 供应商设备封装： | 8-WLCSP |
| 包装： | 带卷 (TR) |
Technical Note
8/16
BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU
www.rohm.com
2009.03 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
●Application Circuit Example
＊SW1 and SW2 are built-in BH76706GU only
See page 3/16 for STBY pin logic in each mode
Fig.11
●Caution on use
1.
Wiring from the decoupling capacitor C4 to the IC should be kept as short as possible.
Moreover, this capacitor's capacitance value may have ripple effects on the IC, and may affect the S-N ratio for signals, so
we recommend using as large a decoupling capacitor as possible.
(Recommended C4:
3.3 F, B characteristics, 6.3 V
or higher maximum voltage)
Make mount board patterns follow the layout example shown on page 10 as closely as possible.
2.
Capacitors to use
In view of the temperature characteristics, etc., we recommend a ceramic capacitor with B characteristics.
3.
The NVCC (C1 pin) terminal generates a voltage that is used within the IC, so it should never be connected to a load
unless absolutely necessary.
Moreover, this capacitor (C2) has a large capacitance value but very little negative voltage
ripple.
(Recommended C2:
1.0
μF, B characteristic, 6.3 V or higher maximum voltage)
4.
Capacitors C1 and C4 should be placed as close as possible to the IC.
If the wiring to the capacitor is too long, it can
lead to intrusion of switching noise.
(Recommended C1:
1.0 F, B characteristics, 6.3 V or higher maximum voltage)
5.
The HPF consists of input coupling capacitor C3 and 150 k
of internal input impedance.
Be sure to check for video signal sag before determining the C3 value.
The cut-off frequency fc can be calculated using the following formula.
fc = 1/(2π×C3×150kΩ)
(Recommended C3:
1.0
μF, B characteristic, 6.3 V or higher maximum voltage)
6.
The output resistor R2 should be placed close to the IC.
7.
If the IC is mounted in the wrong direction, there is a risk of damage due to problems such as inverting VCC and GND.
Be careful when mounting it.
8.
A large current transition occurs in the power supply pin when the charge pump circuit is switched.
If this affects other
ICs (via the power supply line), insert a resistor (approximately 10
) in the VCC line to improve the power supply's ripple
effects.
Although inserting a 10
resistor lowers the voltage by about 0.2 V, this IC has a wide margin for low-voltage
operation, so dynamic range problems or other problems should not occur.
(See Figures 12 to 14.)
※
We are confident in recommending the above application circuit example, but we ask that
you carefully check not just the static characteristics but also transient characteristics of this
circuit before using it.
At playback (Active mode)
Recording (Input mode)
BH76706GU only
A3
B3
C3
A1
B1
C1
CHARGE
PUMP
NVCC
150k
Vcc
VIN
STBY
VOUT
C_PLUS
C_MINUS
NVCC
GND
A2
C2
VIDEO IN
2.5～3.45V
LPF
SW1
SW2
75Ω
A3
B3
C3
A1
B1
C1
CHARGE
PUMP
NVCC
150k
Vcc
VIN
STBY
VOUT
C_PLUS
C_MINUS
NVCC
GND
A2
C2
VIDEO IN
Ｒ2＝75Ω
VIDEO OUT
C2=1.0uF
C4=3.3uF
2.5～3.45V
LPF
Video
monitor
CIRCUIT
CURREN
SW1
SW2
6dB
6/9/12/16.5dB
C4=3.3uF
C2=1.0uF
C1=1.0uF
C3=1.0uF
Ｒ2＝75Ω
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