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Product Detailed Parameters
- Description：IC 12-CH GAMMA BUFFERS 32-LFCSP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bulk
- Applications：TFT-LCD Panels: Gamma Buffer, VCOM Driver
- Output Type：-
- Number of Circuits：12
- Slew Rate：-
- Current - Supply：11 mA
- Current - Output / Channel：10 mA
- Voltage - Supply, Single/Dual (±)：7V ~ 16V
- Mounting Type：Surface Mount
- Package / Case：32-VFQFN Exposed Pad, CSP
- Supplier Device Package：32-LFCSP (5x5)
- -3db Bandwidth：-
- Grade：-
- Qualification：-
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Overview
The ADD8702ACP-R2 is a 12-channel gamma buffer with an integrated VCOM driver, designed for TFT LCD panels. It operates on a single supply of 7 V to 16 V with a maximum supply current of 15 mA. The device features mask-programmable gamma reference levels and adjustable VCOM output. Gamma buffers provide continuous output current of 10 mA, while the VCOM buffer supports up to 35 mA continuous and 250 mA peak current. Output settling time is 1 µs for gamma channels and 0.8 µs for VCOM under specified load conditions.
Feature Summary
- Integrates a 12-channel programmable gamma reference generator and an adjustable VCOM buffer within a single component.
- Features rail-to-rail output capability with fast settling times optimized for high-resolution TFT LCD source drivers.
- Incorporates an internal 500-element resistor string for precise voltage referencing, reducing external component requirements.
Applications
- TFT LCD panel timing and control circuits
- Source driver gamma correction voltage generation
- LCD common plane (VCOM) voltage driving
Procurement Notes
Verify the specific mask option code required for your application, as the resistor tap points are factory programmed. Confirm that the 32-lead LFCSP package dimensions align with your PCB footprint. Ensure ESD precautions are observed during handling due to the device's sensitivity. Check compatibility with existing ADD8701 board designs if upgrading from previous generations.
Selection Notes
Select this component when designing cost-sensitive TFT LCD systems requiring integrated gamma correction and VCOM driving. It is suitable for applications needing rail-to-rail output swing and low power consumption. Consider the fixed mask-programmed values; if variable gamma settings are required post-manufacturing, this part may not be appropriate. Verify thermal performance in the LFCSP package for your specific ambient conditions.
Part Context
The ADD8702 belongs to Analog Devices' family of display driver support ICs, specifically designed to interface with TFT LCD source drivers. It complements other components like the ADD8701 by offering enhanced integration. The device addresses the need for precise gamma voltage generation and stable common voltage driving in portable and desktop display applications.
Replacement Considerations
The ADD8701 is noted as compatible regarding output pin configurations, allowing for potential board design reuse. However, functional differences exist between the two parts. No other direct substitute part numbers are documented in the provided datasheet.
FAQ
How is the VCOM voltage adjusted?
The VCOM output level can be adjusted using an external trim-potentiometer or discrete resistors connected to the VCOM ADJ input pin.
What is the maximum capacitive load the VCOM buffer can drive?
The VCOM buffer can drive up to 1,000 pF of pure capacitive load while maintaining stability.
Are the gamma reference voltages user-adjustable after manufacturing?
No, the 12 gamma reference levels and VCOM are mask programmable at the factory using an on-chip 500-element resistor string.
