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

Compact Video Driver Series for DSCs and Portable Devices

ESD

TECHNICAL NOTE

Ultra-compact Waferlevel

Resistance

Chip Size Packeage

Now available

Single Output Video Drivers

BH76906GU, BH76909GU, BH76912GU, BH76916GU, BH76706GU

ͶDescription 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 μA 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.

ͶFeatures

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 μA (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)

ͶApplication

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

ͶLineup

Product Name Video Driver Amplifier Gain

BH76906GU 6dB 1Vpp

BH76909GU 9dB 0.7Vpp

BH76912GU 12dB 0.5Vpp

BH76916GU 16.5dB 0.3Vpp

BH76706GU 6dB 1Vpp ͵

-order 4.5 MHz LPF

Recommended

Input Level

Video Output Pin Shunt Function



ͶAbsolute Maximum Ratings (Ta = 25 °C)

Parameter Symbol Rating Unit

Supply voltage Vcc 3.55 V

Power dissipation Pd 580 mW

Operating temperature range Topr

Storage temperature range Tstg

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

-40+85 

-55+125 

Nov.2006

ͶOperating Range

Parameter Symbol Min. Typ. Max. Unit

Supply voltage Vcc 2.5 3.0 3.45 V

ͶElectrical Characteristics

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

Parameter Symbol

Circuit current 1-1 I

76906 76909 76912 76916 76706

15.0 mA In active mode (No signal)

CC1-1

Typical Values

Unit Measurement Conditions

In active mode

Circuit current 1-2 I

17.0 mA

CC1-2

(Outputting NTSC color bar signal)



ԜA

In standby mode In input mode (Applying B3 = 1.5

ԜA

Applying B3 = 3.0 V

V Standby mode

ԜA

Applying B3 = 3.0 V

ԜA

Applying B3 = 1.5 V

ԜA

Applying B3 = 0 V

V Standby mode

V Input mode

V Active mode

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

CC2

CC3

thH1

1.2V min V Active mode

thH1

0.45Vmax

thL1

thH2

thM2

thL2

thH2

thM2

thL2



100

VCC

-0.2

(MIN.) VCC/2

(TYP.)

0.2

(MAX.)

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

o=1.0Vp-p

Differential gain DG 0.5 %

Inputting standard staircase Signal

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㩷 mA

50

Output DC offset Voff

max

Input impedance Rin 150

Output pin shunt switch on resistance

Ron



100 kH

Inputting 100 white video signal

100500 kH

Inputting 100 chroma video signal

100500 kH

Inputting 100 chroma video signal

z band

Applying 4.5 V to output pin through 150 Ԉ

With no signal

Voff = (Vout pin voltage)  2 Measure inflowing current when

kԈ

applying A3 = 1 V

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ͶTest Circuit Diagram

㪘㪊㩷

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㪚㪊

㪘㪈㩷

㪙㪈㩷

㪚㪈㩷

㪘㪉㩷

㪚㪉㩷

㪘㪊㩷

㪙㪊㩷

㪚㪊㩷

㪘㪈㩷

㪙㪈㩷

㪚㪈㩷

㪘㪉㩷

㪘㪊㩷

㪙㪊㩷

㪚㪊

㪘㪈㩷

㪙㪈㩷

㪚㪈㩷

㪘㪉㩷

㪚㪉㩷

㪘㪊㩷

㪙㪊㩷

㪚㪊㩷

㪘㪈㩷

㪙㪈㩷

㪚㪈㩷

㪘㪉㩷

㪚㪶㪧㪣㪬㪪

㪈㪅㪇㫌㪝

㪚㪶㪤㪠㪥㪬㪪

㪥㪭㪚㪚

㪈㪅㪇㫌㪝

㪇㪅㪇㪈㫌

㪠㪥

㪚㪟㪘㪩㪞㪜㩷

㩷

㪧㪬㪤㪧

㪦㪬㪫

㪥㪭㪚㪚

㪭㪚㪚㩷

㪈㪇㫌

㪣㪧㪝

㪍㪆㪐㪆㪈㪉㪆㪈㪍㪅㪌㪻㪙

㪞㪥㪛㩷

㪈㪌㪇㫂

㪭㪠㪥

㪪㪫㪙㪰

㪭㪦㪬㪫

㩿㪭㪚㪚㪀

㪎㪌㱅

㪇㪅㪈㫌

㪈㪇㫌

㪠㪥

㪦㪬㪫

㪥㪭㪚㪚

㪪㪮㪉

㪚㪉㩷

㪭㪚㪚㩷

㪣㪧㪝

㪍㪻㪙

㪞㪥㪛㩷

㪚㪶㪧㪣㪬㪪

㪈㪅㪇㫌㪝

㪚㪶㪤㪠㪥㪬㪪

㪥㪭㪚㪚

㪈㪅㪇㫌㪝

㪚㪟㪘㪩㪞㪜㩷

㩷

㪧㪬㪤㪧

㪌㪇㱅

㪎㪌㱅

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

Fig. 1

㪇㪅㪇㪈㫌

㪈㪌㪇㫂

㪪㪮㪈

㩿㪭㪚㪚㪀

㪭㪠㪥

㪪㪫㪙㪰

㪭㪦㪬㪫

㪇㪅㪈㫌

㪌㪇㱅

㪈㪇㪇㱅

㪎㪌㱅

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

ͶBlock Diagram

㪚㪶㪧㪣㪬㪪

㪚㪶㪤㪠㪥㪬㪪

㪥㪭㪚㪚

ͶOperation 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

㪭㪚㪚㩷

㪠㪥

㪚㪟㪘㪩㪞㪜㩷

㩷

㪧㪬㪤㪧

㪦㪬㪫

㪥㪭㪚㪚

㪣㪧㪝

㪍㪆㪐㪆㪈㪉㪆㪈㪍㪅㪌㪻㪙

㪞㪥㪛㩷

(a) BH76906/09/12/16GU

㪈㪌㪇㫂

㪭㪠㪥

㪪㪫㪙㪰

㪭㪦㪬㪫

㪚㪶㪧㪣㪬㪪

㪚㪶㪤㪠㪥㪬㪪

㪥㪭㪚㪚

㪭㪚㪚㩷

㪠㪥

㪚㪟㪘㪩㪞㪜㩷

㩷

㪧㪬㪤㪧

㪦㪬㪫

㪪㪮㪉

㪥㪭㪚㪚

㪍㪻㪙

㪚㪉㩷

㪞㪥㪛㩷

(b) BH76706GU

㪣㪧㪝

Fig. 2

H Active

Standby

H Standby OFF OFF

M Input (Record) ON OFF

L Active (Playback) OFF ON

㪪㪮㪈

㪈㪌㪇㫂

㪭㪠㪥

㪪㪫㪙㪰

㪭㪦㪬㪫

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ͶPin Descriptions

Ball

Name

C_PLUS

A2 VCC

Pin Internal Equivalent Circuit Diagram

Functional Description

Voltage

8%%

+VCC

Flying capacitor “+” pin

8%%

%

C_PLUS

΄΅

See functional descriptions of 7pin,

)0& )0&

08%%

VCC VCC pin

8pin

A3 VIN

B3 STBY

8%%

㪈㪇㪇

8+0

BH769xxGU

3.9k

㪋㪅㪈㫂

㪈㪌㪇㪢

3.9k

㪋㪅㪈㫂

8%%

56$;

-

-

-

)0&

Video signal input pin

VIN

1ԜF

Suitable input signals include composite video signals, chroma signals, R.G.B. signals

ACTIVE/STANBY switching pin

Pin Voltage MODE

1.2 VVCC

0 V0.45 V

( H )

( L )

ACTIVE

STANBY

150k

VCC

BH76706GU

VCC

STBY

VCC

100K

vcc

200K

GND

200K

GND

vcc

GND

vcc

NVCC

! MODE switching pin

Pin Voltage MODE

2.8 VVCC

( H )

1.3 V1.7 V

(M)

0 V0.2 V

(L)

Video signal output pin

STANBY

GND (Record)

㪘㪚㪫㪠㪭㪜㩷

㩿㪧㫃㪸㫐㪹㪸㪺㫂㪀㩷

VOUT

C2 GND

NVCC

GND

8%%

08%%

VOUT

BH76706GU only

)0&

VOUT

GND pin

75Ԉ

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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Flying capacitor “-“ pin (8pin)

C1 NVCC

8%%

)0&

8%%

C_MINUS

%

-VCC

(-2.75 V)

NVC

C_MINUS

)0&

8%% 8%%

08%%

΄΅

-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.

ͶDescription of Operation

! 1) Principles of output coupling capacitorless video drivers

Single-supply amplifier

VCC

1000ԜF

1/2 VCC bias

Output capacitor required since DC voltage is occurring at output pin

75ǡ

Dual-supply amplifier

VCC

-VCC

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

75ǡ

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 μF 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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cc +3V

SW1 SW2

Charge current

㧙

Flying capaci tor

Anchor

Capacitor

Vcc +3 V

Charge current

SW1

Charge current

Flying capaci tor

SW2

㧙

Vcc occurs

㧙

Anchor Capacitor

cc +3V

Charging mode

㧙

Charge shi fting mode

㧙

occurs

㧙

-Vcc

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.

1ǴF

150k

AMP

VCC

75ǡ

Dual-supply amplifier

1-chip integration

Although single-supply,

output capacitor is not needed.

Charge pump

-VCC

1ǴF

Charge pump

1ǴF

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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