ROHM BH76816FVM Technical data

High-performance Video Driver Series

Output Capacitor-less Video Drivers

BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

No.09064EAT02

●Description

The BH768xx series video drivers are the optimum solution for high density integration systems such as, digital still cameras, mobile phones, and portable video devices. A built-in charge pump circuit eliminates the need for a large output coupling capacitor. Features include: a built-in LPF, low-voltage (2.5 V) operation, and 0 µA current consumption during standby mode.

●Features

1) Select from four video driver amp gain settings: 6 dB, 9 dB, 12 dB, and 16 dB

2) Large-output video driver with maximum output voltage of 5.2 Vpp. Supports wide and low-voltage operation range.

3) No output coupling capacitor is needed, which makes for a more compact design

4) Built-in standby function sets circuit current to 0 µA (typ.) during standby mode

5) Clear image reproduction by on-chip 8-order 4.5-MH

6) Bias input method is used to support chroma, video, and RGB signals.

7) MSOP8 compact package

●Applications

Mobile telephones, DSCs (digital still cameras), DVCs (digital video cameras), portable game systems, portable media players, etc.

●Line up matrix

Part No. Video driver amp gain Recommended input level

z LPF (Low Pass Filter)

BH76806FVM 6dB 1Vpp

BH76809FVM 9dB 0.7Vpp

BH76812FVM 12dB 0.5Vpp

BH76816FVM 16.5dB 0.3Vpp

Absolute maximum ratings （T

Parameter Symbol Ratings Unit

Supply voltage Vcc 3.55 V

Power dissipation Pd 470 mW

Operating temperature range Topr

Storage temperature range Tstg -55～+125 ℃

＊ Reduce by 4.7 mW/C over 25C, when mounted on a 70mm×70mm×1.6mm PCB board.

a=25℃）

-40～+85 ℃

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BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

Operating range (Ta=25℃)

Parameter Symbol Min. TYP. Max. Unit

Supply voltage Vcc 2.5 3.0 3.45 V

Electrical characteristics (Unless otherwise noted, Typ.: T

a=25℃, VCC=3V)

Typical value

Parameter Symbol

BH76806

FVM

BH76809

FVM

BH76812

FVM

BH76816

Technical Note

Unit Conditions

FVM

Circuit current 1 I

Circuit current 2 I

Standby SW input current High-Level

Standby switching voltage High-Level

Standby Switching voltage Low-Level

16 15 mA No signal

CC1

0.0 A Standby mode

CC2

I

45 A When 3.0 V is applied to 4pin

thH

V

1.2V min V standby OFF

thH

V

0.45Vmax V standby ON

thL

Voltage gain GV 6.0 9.0 12.0 16.5 dB Vo=100KHz, 1.0Vpp

Maximum output level Vomv 5.2 Vpp f=1KHz,THD=1%

Frequency characteristic 1 Gf1 -0.45 dB f=4.5MHz/100KHz

Frequency characteristic 2 Gf2 -3.0 dB f=8.0MHz/100KHz

Frequency characteristic 3 Gf3 -32 dB f=18MHz/100KHz

Frequency characteristic 4 Gf4 -51 dB f=23.5MHz/100KHz

Differential Gain DG 0.5 %

Differential Phase DP 1.0 deg

Vo=1.0Vp-p Standard stair step signal

V

o=1.0Vp-p

Standard stair step signal

Band = 100 kHz to 6 MH

Y signal output S/N SNY +74 +73 +70 +70 dB

75  termination 100% chroma video signal

Band = 100～500KHz

C signal output S/N (AM) SNCA +77 +76 +75 +75 dB

75Ωtermination 100％chroma video signal Band = 100～500KH

C signal output S/N (PM) SNCP +65 dB

75Ωtermination 100％chroma video signal

Output pin source current lextin 30 mA

±50

Output DC offset voltage Voff

max

4.5 V applied via 150  to output pin

75  termination

mV

z

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2009.03 - Rev.A

BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

Measurement circuit

1. 0u F

1

A

V2

(VCC)

OSC1

1

2

SW3

SW2

10u

50

0. 1u

V4

2

0. 1u

3

4

IN OUT

CHARGE PUMP

GND

6d B/9d B/

LPF

150K

12d B/1 6. 5d B

※ Test circuit is intended for shipment inspections, and differs from application circuit.

Fig. 1

Control pin settings

Parameter States Note

NVCC

Technical Note

8

7

6

5

4. 7u

1. 0u F

75

V

75

V

Block diagram

Standby（4pin）

C1

VCC

Vin

STBY

H Active

L Standby

OPEN Standby

1

IN OUT

2

3

CHARGE PUMP

LPF

GND

NVC C

6dB/9dB/

12dB /1 6.5dB

8

7

6

C2

NVCC

GND

GN D

AMP

150K

4

5

Vout

Fig.2

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2009.03 - Rev.A

BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

T

Pin descriptions

Pin No.

1

name

C1

equivalent circuit

VCC VCC

DC

voltage

+VCC

↑↓

0V

C1

GND GND

NVCC

2 VCC

VCC

Technical Note

Functions

Flying capacitor "+" pin

See function description for pins 7 and 8

VCC Pin

3 VIN

4 STBY

5

VOUT

VCC

4.1k

VIN

100

150K

NV

0V

Video signal input pin

Adaptive input signal Composite video signal/

VIN

1μF

chroma signal/RGB signal, etc.

STBY

VCC

50K

250K

200K

VCC

GND GND

VOU

VCC

to

0V

ACTIVE/STANBY Switching Pin

1.2V～VCC

0V～0.45V

Terminal

Votage

( H )

( L )

MODE

ACTIVE

STANBY

Video signal output pin

VOUT

NVCC

1K

75Ω

150k

VCC

6 GND

GND

0V

GND Pin

NVCC

＊1 The DC voltage in the figure is VCC = 3.0 V. These values are for reference only and are not guaranteed. ＊2 These values are for reference only and are not guaranteed.

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2009.03 - Rev.A

BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

Technical Note

●Pin descriptions

7 NVCC

VCC

GND

VCC

-VCC

C2

(-2.75V)

Flying capacitor “-”pin

(8pin)

C1

C2

NVC

Load voltage pins (7 pins)

NVC

8 C2

GND

VCC VCC

NVCC

0V

↑↓

-VCC

(-2.75V)

＊1 The DC voltage in the figure is VCC = 3.0 V. These values are for reference only and are not guaranteed. ＊2 These values are for reference only and are not guaranteed.

Description of operations

1) Principles of video driver with no output coupling capacitor

Amp (Single power supply)

Amp (Dual power supply)

VCC

1/2VCC Bias

Fig.3 Fig.4

When the amplifier operates using single voltage power supply, the operating potential point is approximately 1/2 Vcc. Therefore, a coupling capacitor is required to prevent DC output. For the video driver, the load resistance is 150  (75  + 75 ). Therefore, the coupling capacitor should be about 1000 µF when a low bandwidth for transmission is considered. (See Figure 3.)

When the amplifier operates using a dual (±) power supply, the operating point can be set at GND level, and therefore, there is no need for a coupling capacitor to prevent DC output. Since a coupling capacitor is not needed, there is no sagging of low-frequency characteristics in output stage. (See Figure

4.)

2) Generation of negative voltage by charge pump circuit

As is shown in Figure 5, the charge pump consists of a pair of switches (SW1 and SW2) and a pair of capacitors (flying capacitor and load capacitor), generating a negative voltage. When +3 V is applied to this IC, approximately -2.83 V of negative voltage is obtained.

Output capacitor is required due to DC

voltage at output pin

75Ω

1000μF

75Ω

VCC

-VCC

Output capacitor is not required since

DC voltage is not applied to output pin

75Ω

VCC

0V

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2009.03 - Rev.A

BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM

ア

Technical Note

Vcc +3V

charge current

+

SW1 SW2

Flying capacitor

Vcc +3V

charge current

SW1 SW2

－

Load capacitor

+

－

charge current

Flying capacitor

-Vcc is generated

－

Load capacitor

+

Vcc +3V

charge current

+

－

charge transfer mode

－

+

－

-Vcc is generated

Fig. 5 Principles of Charge Pump Circuit

1) Configuration of BH768xxFVM Series

As is shown in Figure 6, in the BH768xxFVM Series, a dual power supply amplifier is integrated with a charge pump circuit in the same IC. This enables operation using a + 3V single power supply while also using a dual power supply amplifier, which eliminates the need for an output coupling capacitor.

1μF

AMP

VCC

Dual power supply amp

ンプ H768xxFVM

75Ω

150k

VCC

75Ω

Single chip integration

Output capacitor not required for single power supply either.

Charge Pump

-VCC

3.3μF

Charge pump

768xxFVM

1μF

Fig. 6 BH768xxFVM Configuration Diagram

2) Input terminal type and sag characteristics

BH768xxFVM Series devices provide both a low-voltage video driver and a large dynamic range (approximately 5.2 Vpp). A resistance termination method (150 k termination) is used instead of the clamp method, which only supports video signals, since it supports various signal types. The BH768xxFVM series supports a wide range of devices such as, video signals, chroma signals, and RGB signals that can operate normally even without a synchronization signal. In addition, input terminating resistance (150 k) can use a small input capacitor without reducing the sag low-band It is recommended to use a H-bar signal when evaluating sag characteristics, since it makes sag more noticeable. (See Figures 7 to 10.)

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