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MAX9591
14 Programmable Gamma Reference Buffers with Four Static References for TFT-LCD Displays
Programmable Gamma Buffer with Column Driver Protection
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Status
Active: Data sheet on request only
Description
The MAX9591 provides 14 programmable voltage references and four static voltage references for gamma correction in TFT-LCD displays. Two register banks are provided to store two sets of gamma reference values that are programmed into the banks through an I²C interface. The outputs can switch between gamma reference values in 0.5µs.
The 14 programmable reference voltages are divided evenly into seven upper and seven lower voltages for the upper and lower gamma curves of LCD column drivers.
Each gamma reference voltage has an 8-bit digital-to-analog converter (DAC) with an isolation buffer associated with it to ensure stable operation. Therefore, the reference voltages remain stable without synchronizing to the LCD horizontal timing. In addition, each buffer is able to provide a high current that further ensures a stable voltage when critical levels and patterns are displayed.
The reference voltages ramp up proportional to AVDD during startup and gamma buffers wake up in high impedance until all of the registers are written. This protects the LCD column drivers from high transient currents and reverse bias conditions.
The MAX9591 is available in a 38-pin TQFN package and is specified for operation over the -40°C to +85°C temperature range.
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Data Sheet
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An evaluation kit is available: MAX9591EVKIT
Key Features
- 20V (max) Operating Voltage
- 14 Programmable Reference Voltages
- Four Static Reference Voltages
- Independent DACs
- 8-Bit Resolution per Channel
- Two Register Banks for Two Sets of Gamma Values
- Fast Switching Between Gamma Values
- Output Swing within 100mV of Rails
- 400mA Peak Current on Reference Channels and DAC Channels 1, 7, 8, and 14
- 200mA Peak Current on DAC Channels 2–6, 9–13
- Startup Column Driver Protection
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Applications/Uses
- Industrial Reference Voltage Generators
- TFT-LCD Displays
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Key Specifications:
| Programmable Gamma Buffers |
| Part Number |
Total Channels |
Programmable Channels |
Resolution
(bits) |
Integrated Nonvolatile Memory |
Memory Banks |
VCOM Calibrator |
VCOM Buffer |
Interface |
VSUPPLY
(V) |
IQ
(mA) |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max w/pins |
See Notes |
| MAX9591 |
18 |
14 |
8 |
No |
2 |
No |
No |
I2C |
9 to 20 |
21 |
-40 to +85 |
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36.2 |
$1.30 @1k |
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See All Programmable Gamma Buffers (20)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX9591ETU+
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Active: Data sheet on request only |
TQFN;38 pin;36.2 mm²
Outline Drawing:21-0172 (PDF)
Land Pattern: 90-0076 (PDF)
Use pkgcode/variation: T3857+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9591ETU+T
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Active: Data sheet on request only |
TQFN;38 pin;36.2 mm²
Outline Drawing:21-0172 (PDF)
Land Pattern: 90-0076 (PDF)
Use pkgcode/variation: T3857+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
| MAX9590 |
14 Programmable Gamma Reference Buffers with 4 Static References for TFT-LCD Displays |
| MAX5678 |
Digitally Programmable LCD Gamma Reference Generator with VCOM Calibrator |
| MAX5679 |
Digitally Programmable LCD Gamma Reference Generator with Digital Voltage Reference |
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Information Index
Document Ref.: 19-4124
Rev 0;
2008-05-13
This page last modified: 2009-01-07
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