Renesas EL5825IR

Overview

EL5825IR from Intersil is an 8-channel programmable reference voltage generator for TFT-LCD gamma correction, featuring 10-bit resolution per channel, ±0.1% output accuracy, rail-to-rail output swing (within 100 mV of rails), and serial interface control. It operates from 4.5 V to 16.5 V analog supply and 3.3 V to 5 V digital supply, supporting daisy-chained configurations in display timing circuits.

For engineers reviewing the EL5825IR datasheet, EL5825IR pinout, EL5825IR application, or EL5825IR equivalent, key selection considerations include its 24-pin TSSOP package, 8 independent programmable outputs with 4 ms program-to-out delay, internal/external oscillator mode selection, and compatibility with LCD column driver biasing systems requiring stable, digitally adjustable reference voltages.

Technical Context

The EL5825IR implements a serial-programmable architecture with a 16-bit shift register, ENA-controlled load timing, and SDO-enabled daisy chaining for multi-device synchronization. Its output buffers are rail-to-rail operational amplifiers, each capable of sourcing/sinking up to 30 mA while maintaining ≤20 mV accuracy error across temperature.

Reference range is defined externally via REFH and REFL pins (GND ≤ REFL ≤ REFH ≤ VS), enabling flexible gamma curve shaping; output voltage follows VOUT = VREFL + (data/1024) × (VREFH − VREFL). Internal 25 kHz oscillator or external clock input on OSC pin controls update timing, with configurable mode selection via bit B14 of the serial command word.

Key Specifications

Pinout & Package

EL5825IR is housed in a 24-pin TSSOP package (JEDEC MO-153, pkg drawing MDP0044) with exposed pad not connected internally; thermal pad must be tied to analog ground for stability and thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar reference voltage generator applications.

Compared with EL5825IL, EL5825IR provides identical analog performance in a through-hole-compatible TSSOP package ideal for prototyping and mixed-technology boards; compared with MAX5482, EL5825IR integrates reference generation, rail-to-rail drivers, and daisy-chain capability - reducing BOM count and layout complexity in LCD timing designs.

Availability

EL5825IR is available at Aetrix Electronics and suitable for TFT-LCD display modules, industrial HMI panels, and medical imaging displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for EL5825IR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance signal conditioning, power conversion, and interface solutions.

The EL5825IR belongs to Intersil's TFT-LCD reference generator product line, engineered specifically to replace discrete resistor-divider networks and manual trim pots in gamma voltage generation for flat-panel displays.

FAQ

What is the maximum output current per channel of the EL5825IR?

The EL5825IR supports a maximum continuous output current of 30 mA per channel. This rating applies under steady-state conditions with proper thermal management; exceeding this limit may cause output droop or thermal shutdown. The device maintains ±0.1% accuracy while sourcing or sinking up to 5 mA into a 1.5 kΩ load, as specified in the datasheet's Electrical Specifications table on page 2.

Does the EL5825IR require external components for stable operation?

Yes, the EL5825IR requires external components for stable operation: a 0.1 µF ceramic capacitor must be placed directly at each of the VS, VREFH, VREFL, and CAP pins; additionally, a 4.7 µF tantalum capacitor is recommended at VS, VREFH, and VREFL. The CAP pin capacitor stabilizes the internal bandgap reference, and both ground pins must connect to a low-impedance analog ground plane with minimal trace length.

Can the EL5825IR operate with a 3.3 V digital supply while using a 12 V analog supply?

Yes, the EL5825IR supports independent supply domains: VSD accepts 3.3 V to 5 V for digital logic, while VS accepts 4.5 V to 16.5 V for analog circuitry. This allows direct interfacing with 3.3 V microcontrollers while driving high-voltage LCD bias rails. The datasheet confirms operation at VSD = 3.3 V and VS = 12 V, with no degradation in accuracy or timing performance.

How does the EL5825IR handle large output voltage steps, such as from 0 V to 12 V?

The EL5825IR implements a 2 V/step slew-limited update to prevent transient errors; a full 12 V step requires six 2 V increments. Each increment occurs on successive OSC clock cycles, resulting in a total update time of 2.56 ms to 3 ms depending on phase alignment with the internal refresh cycle. This behavior is documented on page 9 of the FN7005 datasheet under "Channel Outputs".

Is the EL5825IR RoHS compliant and lead-free?

Yes, the EL5825IRZ-T7 variant (RoHS-compliant, Pb-free plus anneal) is available, and the base EL5825IR is also offered in Pb-free versions denoted by the "Z" suffix. All Pb-free variants use 100% matte tin termination and meet IPC/JEDEC J-STD-020 reflow requirements. The ordering information table on page 1 explicitly lists EL5825IRZ-T7 as Pb-free with 7" tape-and-reel packaging.