MAX9672/MAX9673/MAX9674 19-4718 Rev 4 2/11 10-Bit, Programmable Gamma Reference Systems with MTP for TFT LCDs General Description Features The MAX9672/MAX9673/MAX9674 output 12/14/16 volt- DAC Reference Input age references for gamma correction in TFT LCDs and 12/14/16-Channel Gamma Correction, 10-Bit one voltage reference for VCOM. Each gamma refer- Resolution ence voltage has its own 10-bit DAC and buffer to VCOM Driver ensure a stable voltage. The VCOM reference voltage has its own 10-bit DAC and an amplifier to ensure a sta- Integrated MTP Memory ble voltage when critical levels and patterns are dis- Programmable VCOM Limits played. The MAX9672/MAX9673/MAX9674 feature 200mA Peak Current on Gamma Channels integrated multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating 600mA Peak Current on VCOM Channel the need for external EEPROM. The MAX9672/ Ordering Information MAX9673/MAX9674 support up to 300 write operations to the on-chip nonvolatile memory. GAMMA PART PIN-PACKAGE CHANNELS The gamma outputs can drive 200mA peak transient current and settle within 1s. The VCOM output can * MAX9672ETI+ 12 28 TQFN-EP provide 600mA peak transient current and also settles * MAX9673ETI+ 14 28 TQFN-EP within 1s. The analog supply voltage range extends * MAX9674ETI+ 16 28 TQFN-EP from 9V to 20V, and the digital supply voltage range +Denotes a lead(Pb)-free/RoHS-compliant package. extends from 2.7V to 3.6V. *EP = Exposed pad. Gamma values and the VCOM value are programmed Note: All devices are specified over the -40C to +85C temper- 2 into registers through the I C interface. ature range. Functional Diagram Applications REF AVDD TFT LCDs 10 10 10-BIT GMA1 DAC 10 10 10-BIT Pin Configuration GMA2 DAC 10 10 10-BIT GMA3 DAC 10 10 10-BIT TOP VIEW GMA4 DAC 10 10 10-BIT GMA5 DAC 21 20 19 18 17 16 15 10 10 10-BIT GMA6 DAC 10 10 10-BIT 14 GMA9 22 GMA3 GMA7 DAC 10 10 10-BIT 13 GMA2 GMA10 23 GMA8 DAC MTP 2 10 DAC 10 10-BIT I C 12 GMA1 GMA9 GMA11 24 DAC MEMORY REGISTERS REGISTERS MAX9672 10 10 10-BIT 25 11 GND GMA10 GMA12 DAC MAX9673 10 10 MAX9674 10-BIT 26 10 GMA11 GMA13* AVDD DAC 10 10 10-BIT GMA12 GMA14* 27 9 AVDD AMP DAC EP + 10 10 10-BIT GMA13* 28 8 VCOM FB GMA15** DAC 10 10 10-BIT GMA14* DAC 12 3 45 6 7 10 10 10-BIT GMA15** DAC 10 10 10-BIT GMA16** DAC AVDD AMP 10 10 10-BIT DAC VCOM THIN QFN (5mm 5mm) AGND AMP DVDD VCOM FB SDA MAX9672 2 I C SCL MAX9673 EP = EXPOSED PAD, CONNECT EP TO GROUND PLANE. INTERFACE A0 MAX9674 *N.C. FOR THE MAX9672 GND **N.C. FOR THE MAX9672 AND THE MAX9673 *NOT AVAILABLE FOR THE MAX9672 GND **NOT AVAILABLE FOR THE MAX9672 AND THE MAX9673 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE GMA16** AVDD SCL REF SDA GMA8 A0 GMA7 DVDD GMA6 AGND AMP GMA5 VCOM GMA410-Bit, Programmable Gamma Reference Systems with MTP for TFT LCDs ABSOLUTE MAXIMUM RATINGS Supply Voltages SDA, SCL..........................................................................20mA AVDD, REF to GND ............................................-0.3V to +22V GMA1GMA16................................................................200mA AVDD AMP to AGND AMP................................-0.3V to +22V VCOM .............................................................................600mA AVDD to AVDD AMP.........................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) A DVDD to GND.......................................................-0.3V to +4V 28-Pin TQFN-EP (derate 28.6mW/C AGND AMP to GND..........................................-0.1V to +0.1V above +70C) ........................................................2285.7mW Outputs Operating Temperature Range ...........................-40C to +85C GMA1GMA16 ...................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C AVDD VCOM.........................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C AVDD AMP Inputs Lead Temperature (soldering, 10s) .................................+300C SDA, SCL..............................................................-0.3V to +6V Soldering Temperature (reflow) ...................................... +260C VCOM FB...................................-0.3V to (V + 0.3V) AVDD AMP Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 18V, V = V = 18V, V = 3.3V, V = V = 0, VCOM = VCOM FB, no load, T = T to T , AVDD AVDD AMP REF DVDD GND AGND AMP A MIN MAX unless otherwise noted. Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLIES V , AVDD Analog Supply Voltage Range Guaranteed by total output error 9 20 V V AVDD AMP Analog Supply Voltage Range for V 15 20 V AVDD MTP Programming MTP Digital Supply Voltage Range V 2.7 3.6 V DVDD Analog Quiescent Current I 20 35 mA AVDD VCOM Quiescent Current I 2.7 5.6 mA AVDD AMP During a register mode load event 400 Digital Quiescent Current I A DVDD No SCL or SDA transitions 260 600 Thermal Shutdown +160 C Thermal-Shutdown Hysteresis 15 C DVDD undervoltage lockout voltage Undervoltage Lockout Threshold UVLO 2.3 2.6 V threshold REF Input Resistance 384 k VCOM OUTPUT (VCOM) Resolution RES 10 Bits Integral Nonlinearity Error INL 0.125 1 LSB Differential Nonlinearity Error DNL 0.125 1 LSB Code = 512, V = 9V and 20V, T AVDD AMP A Total Output Error V -40 +40 mV ERR = +25C Total Output-Error Drift V Code = 512 15 V/C ERR Output-Voltage Low V T = +25C, sinking 100mA 0.4 0.85 V OUT A 2 MAX9672/MAX9673/MAX9674