Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Amplifier - Video buffering Rail-to-rail 24 MHz TSSOP 14

MEASURE

CURRENT

10nF 10nF

10nF

MEASURE

VOLTAGE

±2.5V

SQUARE WAVE

10:

10: 10:

+2.5V

-2.5V

-8V

300:

3k:

LM6588

www.ti.com

SNOSA77D –MAY 2003–REVISED MARCH 2013

LM6588 TFT-LCD Quad, 16V RRIO High Output Current Operational Amplifier

Check for Samples: LM6588

FEATURES

DESCRIPTION

The LM6588 is a low power, high voltage, rail-to-rail

• (V

= 5V, T

= 25°C Typical Values Unless

input-output amplifier ideally suited for LCD panel

Specified)

COM

driver and gamma buffer applications. The

• Input Common Mode Voltage 0.5V Beyond

LM6588 contains four unity gain stable amplifiers in

Rails

one package. It provides a common mode input

ability of 0.5V beyond the supply rails, as well as an

• Output Voltage Swing (R

= 2kΩ) 50mV from

output voltage range that extends to within 50mV of

Rails

either supply rail. With these capabilities, the LM6588

• Output Short Circuit Current ±200mA

provides maximum dynamic range at any supply

• Continuous Output Current 75mA

voltage. Operating on supplies ranging from 5V to

16V, while consuming only 750μA per amplifier, the

• Supply Current (Per Amp, No Load) 750μA

LM6588 has a bandwidth of 24MHz (−3dB).

• Supply Voltage Range 5V to 16V

The LM6588 also features fast slewing and settling

• Unity Gain Stable

times, along with a high continuous output capability

• −3dB Bandwidth (A

= +1) 24MHz

of 75mA. This output stage is capable of delivering

• Slew Rate 11V/μSec

approximately 200mA peak currents in order to

charge or discharge capacitive loads. These features

• Settling Time 270ns

are ideal for use in TFT-LCDs.

• SOIC-14 and TSSOP-14 Package

The LM6588 is available in the industry standard 14-

• Manufactured in TI’s State-of-the-art Bonded

pin SOIC package and in the space-saving 14-pin

Wafer, Trench Isolated Complementary Bipolar

TSSOP package. The amplifiers are specified for

VIP10™ Technology for High Performance at

operation over the full −40°C to +85°C temperature

Low Power Levels

range.

APPLICATIONS

• LCD Panel V

COM

Driver

• LCD Panel Gamma Buffer

• LCD Panel Repair Amp

Test Circuit Diagram

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.

2VIP10 is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (29 pages)

PAGE 1
LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 LM6588 TFT-LCD Quad, 16V RRIO High Output Current Operational Amplifier Check for Samples: LM6588 FEATURES DESCRIPTION • The LM6588 is a low power, high voltage, rail-to-rail input-output amplifier ideally suited for LCD panel VCOM driver and gamma buffer applications. The LM6588 contains four unity gain stable amplifiers in one package. It provides a common mode input ability of 0.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) Human Body Model Machine Model 2.5KV 250V Supply Voltage (V+ - V−) 18V Differential Input Voltage ±5.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 16V DC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for at TJ = 25°C, VCM = ½VS and RL = 2kΩ. Boldface limits apply at the temperature extremes. Symbol Parameter VOS Input Offset Voltage TC VOS Input Offset Voltage Average Drift IB Input Bias Current IOS Input Offset Current RIN Input Resistance CMRR Common Mode Rejection Ratio Conditions Min (2) Typ (3) Max (2) Units 0.7 4 6 mV 5 −0.3/+0.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com 16V AC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for at TJ = 25°C, VCM = ½VS and RL = 2kΩ. Boldface limits apply at the temperature extremes. Symbol SR Min (2) Typ (3) AV = +1, VIN = 10VPP 8 15 V/μs 15.4 MHz AV = +1 10 24 MHz 61 deg 780 ns Parameter Slew Rate (4) Conditions Unity Gain Bandwidth Product −3dB Frequency Max (2) Units Φm Phase Margin ts Settling Time (0.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 5V DC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for at TJ = 25°C, VCM = ½VS and RL = 2kΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units 4 6 mV VOS Input Offset Voltage 0.7 TC VOS Input Offset Voltage Average Drift 10 IB Input Bias Current IOS Input Offset Current RIN Input Resistance CMRR Common Mode Rejection Ratio −0.3/+0.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com 5V AC Electrical Characteristics (1) Unless otherwise specified, all limits ensured for at TJ = 25°C, VCM = ½VS and RL = 2kΩ. Boldface limits apply at the temperature extremes. Symbol SR Parameter Slew Rate Min (2) Conditions (4) AV = +1, VIN = 3.5VPP Unity Gain Bandwidth Product −3dB Frequency AV = +1 10 Typ (3) Max (2) Units 11 V/μs 15.3 MHz 24 MHz 56 deg 270 ns Φm Phase Margin ts Settling Time (0.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 Typical Performance Characteristics Unless otherwise specified, all limits ensured for TJ = 25°C, VCM = 1/2VS and RL = 2kΩ. Gain Phase vs. Temperature (VS = 5V) Gain Phase vs. Temperature (VS = 16V) 100 100 90 90 90 80 80 -40°C 50 40 GAIN 30 30 85°C 10 10 0 -10 0 -10 -20 100M -20 VS = 5V -20 1M 10M 100k FREQUENCY (Hz) 10k 0 -10 VS = 16V 1M 100k 10k FREQUENCY (Hz) Figure 3. Gain Phase vs.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, VCM = 1/2VS and RL = 2kΩ. CMRR (VS = 5V) CMRR (VS = 16V) 120 120 VS = 5V 110 100 100 90 90 CMRR (dB) CMRR (dB) 110 80 70 80 70 60 60 50 50 40 40 30 30 10 1k 1M 10 10M 1k FREQUENCY (Hz) Figure 9. Settling Time vs. Input Step Amplitude (Output Slew and Settle Time) Settling Time vs.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, VCM = 1/2VS and RL = 2kΩ. Stability vs. Capacitive Load Unity Gain (VS = 16V) Large Signal Step Response 1M VS = 12V VO = 2VPP 100k CAP LOAD (pF) AV = -1, RL = 2k: 10k UNSTABLE 1k 100 10 25% OVERSHOOT 1 -5 -4 -3 -2 -1 0 1 2 3 4 1V/DIV 5 100ns/DIV VOUT (V) Figure 14. Figure 15.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, VCM = 1/2VS and RL = 2kΩ. VOS vs. Common Mode Voltage (VS = 16V) VOS vs. VOUT (Typical Unit), (VS = 10V) 1 1 VS = 10V 0.75 0.5 85°C 0.25 VOS (mV) VOS (mV) 0.5 -40°C 0 85°C 0 -0.25 25°C -0.5 -0.5 25°C -40°C -0.75 -1 -1 -7 -5 -3 -1 1 3 -7 -6 -5 -4 -3 -2 -1 0 1 2 7 5 COMMON MODE VOLTAGE (V) Figure 20. Figure 21.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 Application Notes CIRCUIT DESCRIPTION GENERAL & SPEC The LM6588 is a bipolar process operational amplifier. It has an exceptional output current capability of 200mA. The part has both rail to rail inputs and outputs. It has a −3dB bandwidth of 24MHz. The part has input voltage noise of 23nV/√Hz, and 2nd and 3rd harmonic distortion of −53dB and −40dB respectively.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com APPLICATION HINTS POWER SUPPLIES Sequencing Best practice design technique for operational amplifiers includes careful attention to power sequencing. Although the LM6588 is a bipolar op amp, recommended op amp turn on power sequencing of ground (or V−), followed by V+, followed by input signal should be observed. Turn off power sequence should be the reverse of the turn-on sequence.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 Unity Gain The unity gain or voltage-follower configuration is the most subject to oscillation. If a part is stable at unity gain it is almost certain to work in other configurations. In certain applications where the part is setting a reference voltage or is being used as a buffer greater stability can be achieved by configuring the part as a gain of −1 or −2 or +2.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com The LM6588 meets these requirements. It has a rail-to-rail input and output, typical gain bandwidth and slew rate of 15MHz and 15V/μs, and it can supply up to 200mA of output current. The following sections will describe the operation of VCOM Drivers, Gamma Buffers, and Panel Repair Buffers, showing how the LM6588 is well suited for each of these functions.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 ROW DRIVERS COLUMN DRIVERS CSTRAY CSTRAY CSTRAY VCOM VCOM VCOM PIXEL PIXEL PIXEL APPROX VDD/2 + - TFT-LCD PANEL VCOM VCOM DRIVER Figure 26. TFT Display Figure 26 is a simplified block diagram of a TFT display, showing how individual pixels are connected to the row, column, and VCOM lines. Each pixel is represented by capacitor with an NMOS transistor connected to its top plate. Pixels in a TFT panel are arranged in rows and columns.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com R R C C R R R VCOM C C C COLUMN LINE Figure 27. Model of Impedance between VCOM and Column Lines A VCOM driver is essentially a voltage regulator that can source and sink current into a large capacitive load. To simplify the analysis of this driver, the distributed RC network of Figure 27 has been reduced to a single RC load in Figure 28.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 RF2 300: RF1 3k: VCOM VCOM LOAD +6.5V - RS 10: RL1 10: RL2 10: RL3 10: C2 10nF C3 10nF C4 10nF + -6.5V IOUT C1 10nF VSW 5V 0V Figure 29. VCOM Driver Test Circuit (2V/DIV) (5V/DIV) Figure 29 is a common test circuit used for measuring VCOM driver response time. The RC network of RL1 to RL3 and C1 to C4 models the distributed RC load of a VCOM line.
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LM6588 www.ti.com (5 V/DIV) SNOSA77D – MAY 2003 – REVISED MARCH 2013 (200 mA/DIV) VSW ICOM 2 PSec/DIV Figure 31. VSW and IOUT Waveforms from VCOM Test Circuit GAMMA BUFFER Illumination in a TFT display, also referred to as grayscale, is set by a series of discrete voltage levels that are applied to each LCD pixel. These voltage levels are generated by resistive DAC networks that reside inside each of the column driver ICs.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 Figure 33 shows how column drivers in a TFT display are connected to the gamma levels. VGMA1, VGMA5, VGMA6, and VGMA10 are driven by the Gamma Buffers. These buffers serve as low impedance voltage sources that generate the display’s gamma levels. The Gamma Buffers’ outputs are set by a simple resistive ladder, as shown in Figure 33.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com VOUT VF t 0 TPD TSR TSET Figure 34. Large Signal Transient Response of an Operational Amplifier Figure 34 illustrates how an op amp responds to a large-signal transient. When such a transient occurs at t = 0, the output does not start changing until TPD, which is the op amp’s propagation delay time (typically 20ns for the LM6588). The output then changes at the op amp’s slew rate from t = TPD to TSR.
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LM6588 www.ti.com SNOSA77D – MAY 2003 – REVISED MARCH 2013 capacitance on that line increases substantially. For instance, a column typically has 50pF to 100pF of line capacitance, but a repaired column can have up to 200pF. Column drivers are not designed to drive this extra capacitance, so a panel repair buffer provides additional output current to the repaired column line. Note that there is typically a 20Ω to 100Ω resistor in series with the buffer output.
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LM6588 SNOSA77D – MAY 2003 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 22 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 30-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM6588MAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LM6588MTX/NOPB TSSOP PW 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM6588MAX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LM6588MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.
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