ROHM BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU Technical data

Compact Video Driver Series for DSCs and Portable Devices

Ultra-compact Waferlevel
Chip Size Packeage
Output Capacitor-less
Single Output Video Drivers

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

No. 09064EAT01

●Description

Due to a built-in charge pump circuit, this video driver does not require the large capacity tantalum capacitor at the video
output pin that is essential in conventional video drivers. Features such as a built-in LPF that has bands suited to mobile
equipment, current consumption of 0 A at standby, and low voltage operation from as low as 2.5 V make it optimal for
digital still cameras, mobile phones, and other equipment in which high density mounting is demanded.

●Features

1) WLCSP ultra-compact package (1.6 mm x 1.6 mm x 0.75 mm)

2) Improved noise characteristics over BH768xxFVM series

3) Four video driver amplifier gains in lineup: 6 dB, 9 dB, 12 dB, 16.5 dB

4) Large output video driver of maximum output voltage 5.2 Vpp. Ample operation margin for supporting even low
voltage operation

5) Output coupling capacitor not needed, contributing to compact design

6) Built-in standby function and circuit current of 0 A (typ) at standby

7) Clear image playback made possible by built-in 8

8) Due to use of bias input format, supports not only video signals but also chroma signals and RGB signals

9) Due to built-in output pin shunt switch, video output pin can be used as video input pin (BH76706GU)

●Applications

Mobile phone, digital still camera, digital video camera, hand-held game, portable media player

●Line up matrix

Product Name Video Driver Amplifier Gain

BH76906GU 6dB 1Vpp

BH76909GU 9dB 0.7Vpp

BH76912GU 12dB 0.5Vpp

BH76916GU 16.5dB 0.3Vpp

th

-order 4.5 MHz LPF

Recommended

Input Level

Video Output Pin Shunt Function

―

BH76706GU 6dB 1Vpp ○

●Absolute Maximum Ratings (T

Parameter Symbol Rating Unit

Supply voltage Vcc 3.55 V

Power dissipation Pd 580 mW

Operating temperature range Topr -40～+85 ℃

Storage temperature range Tstg

＊ When mounted on a 50 mm×58 mm×1.6 mm glass epoxy board, reduce by 5.8mW/°C above Ta=+25°C.

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a = 25 °C)

-55～+125 ℃

2009.03 - Rev.A

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

Technical Note

●Operating Range

Parameter Symbol Min. Typ. Max. Unit

Supply voltage Vcc 2.5 3.0 3.45 V

●Electrical Characteristics

[Unless otherwise specified, Typ. : Ta = 25 °C, VCC = 3V]

Typical Values

Parameter Symbol

Circuit current 1-1 I

BH76906

15.0 mA In active mode (No signal)

CC1-1

GU

BH76909

GU

BH76912

GU

BH76916

GU

BH76706

GU

Unit Measurement Conditions

In active mode

Circuit current 1-2 I

17.0 mA

CC1-2

(Outputting NTSC color bar
signal)

Circuit current 2 I

Circuit current 3 I

Standby switch input current
High Level
Standby switch switching voltage
High Level
Standby switch switching voltage
Low Level
Standby switch outflow current
High Level
Standby switch outflow current
Middle Level
Standby switch outflow current
Low Level

Mode switching voltage
High Level

Mode switching voltage
Middle Level
Mode switching voltage
low Level

0.0 A In standby mode

CC2

－ 100 A

CC3

45

I

thH1

1.2V min V Active mode

V

thH1

0.45Vmax V Standby mode

V

thL1

I

thH2

I

thM2

I

thL2

－

V

thH2

V

thM2

V

thL2

－

0

8

23

VCC

-0.2

(MIN.)

VCC/2

(TYP.)

0.2

(MAX.)

In input mode (Applying B3 =

1.5 V)

A Applying B3 = 3.0 V

A Applying B3 = 3.0 V

A Applying B3 = 1.5 V

A Applying B3 = 0 V

V Standby mode

V Input mode

V Active mode

Voltage gain GV 6.0 9.0 12.0 16.5 6.0 dB Vo=100kHz, 1.0Vpp
Maximum output level Vomv 5.2 Vpp f=10kHz,THD=1%
Frequency characteristic 1 Gf1 -0.2 -0.2 dB f=4.5MHz/100KHz
Frequency characteristic 2 Gf2 -1.5 -1.4 dB f=8.0MHz/100KHz
Frequency characteristic 3 Gf3 -26 -28 dB f=18MHz/100KHz
Frequency characteristic 4 Gf4 -44 -48 dB f=23.5MHz/100KHz

V

o=1.0Vp-p

Differential gain DG 0.5 %

Inputting standard staircase
Signal
V

o=1.0Vp-p

Differential phase DP 1.0 deg

Inputting standard staircase
signal

z～6MHz band

Y signal to noise ratio SNY +74 +73 +70 +70 +74 dB

C AM signal to noise ratio SNCA +77 +76 +75 +75 +77 dB

C PM signal to noise ratio SNCP +65 dB

Current able to flow into output pin lextin 30 mA

Output DC offset Voff ±50max mV

Input impedance Rin 150 k

Output pin shunt switch
on resistance

Ron － 3 

100 kH

Inputting 100％ white video signal

100～500 kHz band

Inputting 100％ chroma video signal

100～500 kHz band

Inputting 100％ chroma video signal

Applying 4.5 V to output pin
through 150 Ω
With no signal
Voff = (Vout pin voltage) ÷ 2
Measure inflowing current when
applying A3 = 1 V

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2009.03 - Rev.A

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

A

V

●Test Circuit Diagram

1.0uF

V

C_PLUS

C_MINUS

NVCC

1.0uF

10u

VCC

A2

A1

B1

C1

IN

CHARGE

PUMP

OUT

NVCC

LPF

6/9/12/16.5dB

GND

C2

0.01u

150k

A

(VCC)

1.0uF

V

C_PLUS

C_MINUS

NVCC

A1

B1

C1

1.0uF

VIN

A3

STBY

B3

VOUT

C3

0.1u

50Ω

A

75Ω

V

V

A

75Ω

(a) BH76906/09/12/16GU (b) BH76706GU

Fig. 1

CHARGE

PUMP

OUT

NVCC

Technical Note

A

0.01u

10u

VCC

A2

IN

150k

LPF

SW2

6dB

SW1

C2

GND

VIN

A3

STBY

B3

VOUT

C3

A

(VCC)

0.1u

50Ω

A

100Ω

V

75Ω

V

V

75Ω

※ A test circuit is a circuit for shipment inspection and differs from an application circuit example.

●Block Diagram

C_PLUS

A1

B1

C_MINUS

NVCC

C1

●Operation Logic

BH769xxGU

STBY Pin Logic Operating Mode

OPEN

BH76706GU

STBY Pin Logic Operating Mode SW1 SW2

※Use of the BH76706GU with the STBY pin OPEN is inappropriate

VCC

A2

IN

CHARGE

PUMP

OUT

NVCC

LPF

6/9/12/16.5dB

GND

C2

(a) BH76906/09/12/16GU

150k

VIN

A3

STBY

B3

VOUT

C3

C_PLUS

A1

B1

C_MINUS

NVCC

C1

VCC

A2

IN

CHARGE

PUMP

OUT

SW2

NVCC

6dB

C2

GND

(b) BH76706GU

LPF

Fig. 2

H Active

L

Standby

H Standby OFF OFF

M Input (Record) ON OFF

L Active (Playback) OFF ON

SW1

150k

VIN

A3

STBY

B3

VOUT

C3

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2009.03 - Rev.A

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

●Pin Descriptions

Ball

A1

Pin

Name

C_PLUS

Pin Internal Equivalent Circuit Diagram

VCC
VCC

C_PLUS

C1

DC

Voltage

+VCC

↑↓

Functional Description

Flying capacitor “+” pin

See functional descriptions of 7pin,

0V

GND
GND

NVCC

100

3.9k

4.1k

150K

VCC

3.9k

4.1k

VCC VCC pin

0V

Video signal input pin

Suitable input signals include

NV

composite video signals,

A2 VCC

A3 VIN

VIN

chroma signals, R.G.B. signals

50K

250K

200K

100K

VCC

VCC

vcc

200K

GND

GND

vcc

VCC

to

0V

ACTIVE/STANBY switching pin

Pin Voltage

1.2 V～VCC

( H )

0 V～0.45 V

( L )

MODE switching pin

Pin Voltage

B3 STBY

BH769xxGU

STBY

BH76706GU

2.8 V～VCC

STBY

GND

vcc

( H )

1.3 V～1.7 V

(M)

200K

GND

GND

NVCC

VCC

VCC

0 V～0.2 V

(L)

Video signal output pin

8pin

VIN

1μF

ACTIVE

STANBY

STANBY

GND (Record)

ACTIVE

(Playback)

Technical Note

150k

MODE

MODE

C3

VOUT

C2 GND

NVCC

NVCC

1K

VCC

NVCC

GND

VOUT

BH76706GU only

GND

0V

0V

VOUT

GND pin

75Ω

75Ω

Note 1) DC voltages in the figure are those when VCC ＝ 3.0 V. Moreover, these values are reference values which are

not guaranteed.

Note 2) Numeric values in the figure are settings which do not guarantee ratings.

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2009.03 - Rev.A

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

Technical Note

Flying capacitor “-“ pin (8pin)

C1

C2

NVC

0V

NVC

C1 NVCC

B1

C_MINUS

VCC

GND

GND

VCC
VCC

VCC

C_MINUS

C2

-VCC

(-2.75 V)

0V

↑↓

NVCC

-VCC

(-2.75 V)

Negative voltage pin (7pin)

Note 1) DC voltages in the figure are those when VCC ＝ 3.0 V. Moreover, these values are reference values which are

not guaranteed.

Note 2) Numeric values in the figure are settings which do not guarantee ratings.

●Description of Operation

1) Principles of output coupling capacitorless video drivers

Single-supply amplifier

VCC

1000μF

1/2 VCC bias

Output capacitor required since DC
voltage is occurring at output pin

75Ω

75Ω

Dual-supply amplifier

VCC

-VCC

Output capacitor not required since
DC voltage does not occur at output
pin

75Ω

75Ω

Fig.3 Fig.4

For an amplifier operated from a single power supply (single-supply), since the operating point has a potential of
approximately 1/2 Vcc, a coupling capacitor is required for preventing direct current in the output. Moreover, since the
load resistance is 150  (75  + 75 ) for the video driver, the capacity of the coupling capacitor must be on the order of
1000 F if you take into account the low band passband. (Fig.3)

For an amplifier operated from dual power supplies (+ supply), since the operating point can be at GND level, a coupling
capacitor for preventing output of direct current is not needed.

Moreover, since a coupling capacitor is not needed, in principle, there is no lowering of the low band characteristic at the
output stage. (Fig.4)

2) Occurrence of negative voltage due to charge pump circuit

A charge pump, as shown in Fig. 5, consists of a pair of switches (SW1, SW2) and a pair of capacitors (flying capacitor,
anchor capacitor). Switching the pair of switches as shown in Fig. 5 causes a negative voltage to occur by shifting the
charge in the flying capacitor to the anchor capacitor as in a bucket relay.

In this IC, by applying a voltage of +3 V, a negative voltage of approximately -2.8 V is obtained.

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2009.03 - Rev.A

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

V

V

Technical Note

cc +3V

SW1 SW2

Charge current

+

－

Flying capacitor

Anchor

Capacitor

Vcc +3V

Charge current

SW1

+

Charge current

Flying capacitor

SW2

－

Vcc occurs

-

－

Anchor Capacitor

+

cc +3V

Charging mode

－

+

Charge shi fting mode

－

+

+

-Vcc

－

occurs

Fig.5 Principles of Charge Pump Circuit

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.

1μF

AMP

VCC

Dual-supply amplifier

75Ω

150k

VCC

75Ω

1-chip integration

Although single-supply,
output capacitor is not needed.

Charge pump

-VCC

1μF

Charge pump

1μF

Fig.6 Configuration Diagram of BH769xxGU or BH76706GU

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)

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