Renesas EL5225IRZ

Overview

EL5225IRZ from Intersil is a 10-channel TFT-LCD reference voltage generator with 10-bit programmable outputs, ±1% accuracy, rail-to-rail output swing (within 50mV of rails), and SPI-compatible 3-wire interface - used to generate gamma correction voltages for LCD panel drive circuits.

For engineers reviewing the EL5225IRZ datasheet, EL5225IRZ pinout, EL5225IRZ application, or EL5225IRZ equivalent, key selection factors include analog supply range (5V–16.5V), digital supply compatibility (3.3V/5V), channel-to-channel mismatch (≤2mV), refresh timing control via internal/external oscillator, and TSSOP-24 package thermal constraints.

Technical Context

The EL5225IRZ implements a segmented sample-and-hold architecture per channel, refreshed synchronously by an internal 21kHz oscillator or external clock up to 70kHz. Each output updates in 1–10 oscillator cycles, with worst-case program-to-out delay of 4ms.

It uses dual supply domains: VS+ (5V–16.5V) powers analog circuitry and rail-to-rail buffers; VSD (3.3V–5V) powers digital logic. Reference inputs (REFH/REFL) define the 10-bit DAC transfer function: V_OUT = V_REFL + (data/1024) × (V_REFH − V_REFL), with input resistance of 32kΩ between REFH and REFL.

Key Specifications

Pinout & Package

EL5225IRZ is housed in a RoHS-compliant 24-pin TSSOP package (MDP0044), optimized for surface-mount assembly and thermal performance (θ_JA = 85°C/W on high-conductivity board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5216EEE+ and AD5667RBRMZ-REEL7, the EL5225IRZ delivers integrated 10-channel gamma generation with programmable rail-to-rail swing and REFH/REFL scaling - eliminating external components and enabling direct LCD panel interface without redesign.

Availability

EL5225IRZ is available at Aetrix Electronics and suitable for TFT-LCD display modules, industrial HMI panels, and medical imaging displays requiring stable component supply and long-term lifecycle support.

Supply support for EL5225IRZ 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 focused on high-performance signal conditioning and power solutions.

The EL5225IRZ belongs to Intersil's TFT-LCD reference generator product line, engineered specifically to replace discrete resistor ladders and op-amp networks in gamma voltage generation for flat-panel displays.

FAQ

What is the maximum clock frequency supported by the EL5225IRZ SPI interface?

The EL5225IRZ supports a maximum SCLK frequency of 5MHz, as specified in the Electrical Specifications table. This allows rapid reprogramming of output voltages during display calibration or dynamic gamma adjustment. The EL5225IRZ timing parameters require minimum setup/hold times of 10ns, and the interface remains fully functional across its full operating temperature range of –40°C to +85°C.

Does the EL5225IRZ require external resistors to set its output voltage range?

No, the EL5225IRZ does not require external resistors to define its output range - it uses user-supplied analog reference voltages applied directly to the REFH and REFL pins. These pins establish the DAC's full-scale span (V_REFH − V_REFL), and the 10-bit code determines the exact output within that range. The EL5225IRZ internal impedance between REFH and REFL is 32kΩ, so external sources must be low-impedance and stable.

Can multiple EL5225IRZ devices be synchronized for simultaneous output updates?

Yes, multiple EL5225IRZ devices can be synchronized using shared ENA and SCLK lines with daisy-chained SDI→SDO connections. When ENA is held low, a continuous stream of 16-bit words is shifted through the chain; the last word reaches the first device, and the first word reaches the last. Pulling ENA high simultaneously updates all addressed outputs - ensuring deterministic, glitch-free gamma voltage transitions across stacked devices.

What is the purpose of the CAP pin on the EL5225IRZ?

The CAP pin on the EL5225IRZ connects to a 0.1µF ceramic bypass capacitor that stabilizes the internal 1.3V bandgap reference voltage. This capacitor is critical for maintaining output accuracy and minimizing noise coupling into the DAC reference path. Placement must be within 2mm of the CAP pin and tied directly to the nearest GND pin - failure to properly decouple this pin degrades INL/DNL performance and increases output droop.

Is the EL5225IRZ still recommended for new designs?

No - the EL5225IRZ datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS" and lists "NO RECOMMENDED REPLACEMENT." While fully functional and supported for legacy repair and continuity, new designs should evaluate modern alternatives such as Renesas' ISL26712 or TI's DAC8568 for enhanced resolution, lower drift, and extended temperature range - especially where long-term obsolescence risk must be mitigated.