Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Amplifier - Video buffering Rail-to-rail 1 MHz HTSSOP 28

SLOS359F − MARCH 2001 − REVISED MAY 2004

    





FEATURES

D Gamma Correction Channels: 10, 6

D Integrated V

COM

Buffer

D Excellent Output Current Drive:

− Gamma Channels: > 30mA at

0.5V Swing to Rails

(1)

− V

COM

: > 150mA at

5V Swing to Rails

(1)

D Large Capacitive Load Drive Capability

D Rail-to-Rail Output

D PowerPAD Package

D Low-Power/Channel: < 340µA

D Wide Supply Range: 4.5V to 16V

D Specified for 0°C to 85°C

D High ESD Rating: 4kV

(1)

See typical characteristic curves for detail.

MODEL

GAMMA

CHANNELS

VCOM CHANNELS

BUF11702 10 1

BUF07702

(1)

6 1

(1)

The BUF07702 is not recommended for new designs. Informa-

tion is provided for reference only. For new designs, the pin-com-

patible BUF07703 is recommended; more information can be

found at www.ti.com.

DESCRIPTION

The BUFxx702 are a series of multi-channel buffers

targeted towards gamma correction in high-resolution

LCD panels. The number of gamma correction

channels required depends on a variety of factors and

differs greatly from design to design. Therefore, various

channel options are offered. For additional space and

cost savings, a V

COM

channel with higher current drive

capability is integrated in the BUF11702 and

BUF07702.

The various buffers within the BUFxx702 are carefully

matched to the voltage I/O requirements for the gamma

correction application. Each buffer is capable of driving

heavy capacitive loads and offers fast load current

switching. The V

COM

channel has increased output

drive of > 100mA and can handle even larger capacitive

loads.

The BUF07702 and BUF11702 is available in the

TSSOP-PowerPAD package for dramatically

increased power dissipation capability. This way, a

large number of channels can be handled safely in one

package.

A flow-through pinout has been adopted to allow simple

PCB routing and maintain the cost-effectiveness of this

solution. All inputs and outputs of the BUFxx702

incorporate internal ESD protection circuits that prevent

functional failures at voltages up to 4kV (HBM) as

tested under MIL-STD-883C Method 3015.

www.ti.com

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PowerPAD is a trademark of Texas Instruments Incorporated. All other trademarks are the property of their respective owners.

Summary of content (28 pages)

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SLOS359F − MARCH 2001 − REVISED MAY 2004 FEATURES D Gamma Correction Channels: 10, 6 D Integrated VCOM Buffer D Excellent Output Current Drive: D D D D D D D DESCRIPTION The BUFxx702 are a series of multi-channel buffers targeted towards gamma correction in high-resolution LCD panels. The number of gamma correction channels required depends on a variety of factors and differs greatly from design to design.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted(1) PARAMETERS Supply, VDD(2) Input Voltage Range, VI BUFXX702 UNIT 16.5 V VDD See Dissipation Rating Table V 0 to 85 °C Maximum Junction Temperature, TJ 150 °C Storage Temperature Range, TSTG −65 to 150 °C Continuous Total Power Dissipation Operating Free-Air Temperature Range, TA Lead Temperature 1.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 ELECTRICAL CHARACTERISTICS: BUF11702 Over operating free-air temperature range, VDD = 4.5V to 16V, TA = 25°C, unless otherwise noted.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 ELECTRICAL CHARACTERISTICS: BUF07702 Over operating free-air temperature range, VDD = 4.5V to 16V, TA = 25°C, unless otherwise noted.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 PARAMETER MEASUREMENT INFORMATION Buffer RNULL CL RL Figure 1. Bandwidth and Phase Shift Test Circuit Buffer VO RS 5V CS 5V LCD Driver CL Equivalent Load RL VTL tT V1 Source Ch1−Ch10 V1 0V VTL 2V tT 0.1 µs CS 100 pF RS 100 Ω CL 100 pF RL 1 kΩ Sink Ch1−Ch10 10 V 2V 0.1 µs 100 pF 100 Ω 100 pF 1 kΩ Test Figure 2. Transient Load Response Test Circuit Buffer tT VO 5V RNULL RL CL 10 V 5V 0V VTL VTL Figure 3.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 TYPICAL CHARACTERISTICS DC CURVES INPUT OFFSET VOLTAGE vs INPUT VOLTAGE INPUT OFFSET VOLTAGE vs INPUT VOLTAGE 20 20 20 15 5 0 −5 −10 −15 −20 10 5 0 −5 −10 −15 −20 1 2 3 4 5 6 7 VI − Input Voltage − V 8 9 10 Figure 4 V OH − High-Level Output Voltage − V I IB − Input Bias Current − pA 200 150 100 50 0 10 20 30 40 50 60 70 TA − Free-Air Temperature − °C TA = 0°C TA = +25°C 7 TA = +85°C 6.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 TYPICAL CHARACTERISTICS DC CURVES (CONTINUED) LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT 5 BUF11702 VDD = 10 V Channels 1 to 5 8 7 BUF07702 VDD = 10 V Channels 1 to 3 6 5 4 TA = 0°C 3 TA = +25°C TA = +85°C 2 1 0 0 4 BUF07702 VDD = 10 V Channels 4 to 5 3.5 3 2.5 2 TA = 0°C 1.5 TA = +25°C 1 TA = +85°C 0.5 0.5 0.4 TA = 0°C 0.3 TA = +25°C 0.2 TA = +85°C 0.1 V OL− Low-Level Output Voltage − V 0.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 TYPICAL CHARACTERISTICS AC CURVES −3 dB BANDWIDTH vs SUPPLY VOLTAGE −3 dB BANDWIDTH vs FREE-AIR TEMPERATURE 1.2 BUF07702 Channel 5 0.75 VCOM Buffer 0.5 RL = 2 kΩ CL = 100 pF TA = +25°C 0 5V 1 10, 15 V 0.8 VCOM Buffer 0.6 5, 10, 15 V 0.4 0.2 RL = 2 kΩ CL = 100 pF 0 0 2 4 6 8 10 12 VDD − Supply Voltage − V 14 0 10 V 0.7 15 V 0.6 0.5 0.4 0.3 0.2 0 1000 3 2 1.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 TYPICAL CHARACTERISTICS TRANSIENT CURVES (CONTINUED) 2.55 VDD = 5 V VI = 100 mV RL = 2 kΩ CL = 100 pF TA = +25°C 2.50 2.45 VO − Output Voltage − V 2.40 2.60 VI 5.05 VDD = 10 V VI = 100 mV RL = 2 kΩ CL = 100 pF TA = +25°C 5 4.95 Gamma Channels Gamma Channels 5.05 2.55 VCOM Buffer VCOM Buffer 4.95 2.45 2.40 0 0.5 1 1.5 2 2.5 3 3.5 t − Time − µs 4 4.5 0 5 0.50 Figure 36 1 1.50 2 2.50 3 t − Time − µs 3.50 4 4.90 4.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 TYPICAL CHARACTERISTICS TRANSIENT CURVES (CONTINUED) 5.1 5.05 5 4.95 4.9 4.85 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Channel 1 VDD = 10 V, VI = 5 V, RL = 1 kΩ, tT = 0.1 µs, TA = +25°C 5.8 CL = 100 pF 5.4 5.2 5 CL = 10 nF RNULL = 100 Ω 4.6 0 1 2 3 4 5 t − Time − µs Figure 40 IL− Load Current − mA IL− Load Current − mA Sinking 6 VCOM Buffer VDD = 10 V, VI = 5 V, RL = 500 Ω, tT = 0.1 µs, TA = +25°C 0 −6 5.2 5 4.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 APPLICATION INFORMATION The requirements on the number of gamma correction channels vary greatly from panel to panel. Therefore, the BUFxx702 series of gamma correction buffers offers different channel combinations. The BUF11702 offers 10 gamma channels plus one VCOM channel, whereas the BUF07702 provides six gamma channels plus one VCOM. The VCOM channel on both models can be used to drive the VCOM node on the LCD panel.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 INPUT VOLTAGE RANGE GAMMA BUFFERS COMMON BUFFER (VCOM) Figure 45 shows a typical gamma correction curve with 10 gamma correction reference points (GMA1 through GMA10). As can be seen from this curve, the voltage requirements for each buffer vary greatly. The swing capability of the input stages of the various buffers is carefully matched to the application.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 APPLICATIONS WITH >10 GAMMA CHANNELS When a greater number of gamma correction channels are required, two or more BUFxx702 devices can be used in parallel, as shown in Figure 48. This capability provides a cost-effective way of creating more reference voltages over the use of quad-channel op amps or buffers. The suggested configuration in Figure 48 simplifies layout.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 COMPLETE LCD SOLUTION FROM TI In addition to the BUFxx702 line of gamma correction buffers, TI offers a complete set of ICs for the LCD panel market, including source and gate drivers, various power-supply solutions, and audio power solutions. Figure 50 shows the total IC solution from TI. AUDIO POWER AMPLIFIER FOR TV SPEAKERS The TPA3002D2 is a 7W (per channel) stereo audio amplifier specifically targeted towards LCD monitors and TVs.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 DIE Side View (a) Thermal Pad DIE End View (b) NOTE A: Bottom View (c) The thermal pad is electrically isolated from all terminals in the package. Figure 51. Views of Thermally Enhanced DGN Package 1. Prepare the PCB with a top-side etch pattern (see Pin Configurations). There should be etching for the leads as well as etch for the thermal pad. 2. Place 18 holes in the area of the thermal pad.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 APPLICATION INFORMATION BUF11702 Demonstration Board (Contact Factory) decoupling capacitors are connected to the ground plane of the demo board, as are the ground terminals of the BUF11702. The BUF11702 has an demonstration board that can be mounted along with reference resistors and load capacitors. This enables the BUF11702 to be used in its own daughterboard in existing designs for easy evaluation.
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www.ti.com SLOS359F − MARCH 2001 − REVISED MAY 2004 REFERENCE VOLTAGES The reference voltages can be supplied externally via the connector J2 (not included) or generated onboard via resistors R1 to R11. An external low side reference has been provided on the board so that the negative references can be referred to a voltage other than ground. The reference ladder can be referred to either VDD (master supply voltage) or a secondary voltage, VDD2.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.