Renesas ISL22424UFR16Z-TK

Overview

ISL22424UFR16Z-TK from Renesas Electronics (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with SPI interface, 256-tap resolution, 50kΩ end-to-end resistance, and 16-lead QFN package. It operates from dual supplies (VCC = 2.25–5.5V, V− = −2.25 to −5.5V), supports voltage divider and rheostat modes, and retains wiper position in non-volatile EEPROM. It is used in precision biasing, gain control, and offset trimming for bipolar signal chains.

For engineers reviewing the ISL22424UFR16Z-TK datasheet, ISL22424UFR16Z-TK pinout, ISL22424UFR16Z-TK application, or ISL22424UFR16Z-TK equivalent, key selection criteria include dual-supply bipolar operation, 50kΩ resistance tolerance (±20%), ±0.2 LSB DNL in voltage divider mode, 1.5µs wiper response time, and compatibility with daisy-chained SPI configurations.

Technical Context

The ISL22424UFR16Z-TK integrates two independent 8-bit volatile Wiper Registers (WR0/WR1) and non-volatile Initial Value Registers (IVR0/IVR1), enabling power-up recall of preset positions. Each DCP uses resistor-string architecture with CMOS switches in make-before-break configuration, ensuring monotonicity and glitch-free transitions.

Its SPI interface complies with Mode 0 (CPOL=0, CPHA=0), supporting read/write to wiper, IVR, and 13 general-purpose non-volatile registers. The ACR register controls volatile/non-volatile access, shutdown mode, and SDO output type (push-pull default), with internal non-volatile write cycles requiring up to 20ms.

Key Specifications

Pinout & Package

ISL22424UFR16Z-TK is housed in a 16-lead QFN (4mm × 4mm, L16.4x4A), thermally enhanced with exposed die pad internally connected to V−. PCB thermal land for EPAD should be connected to V− plane per TB389 guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5242BRUZ100 and MCP42050-I/SL, the ISL22424UFR16Z-TK uniquely supports true bipolar terminal voltage swing (V− to VCC), enabling direct integration into ±5V or ±3.3V signal paths without external components-critical for precision instrumentation and sensor interfaces.

Availability

ISL22424UFR16Z-TK is available at Aetrix Electronics and suitable for precision instrumentation offset calibration, programmable gain amplifier design, bipolar signal conditioning, and industrial sensor biasing requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for ISL22424UFR16Z-TK 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

Renesas Electronics acquired Intersil in 2017 and maintains its high-performance analog portfolio, emphasizing precision, reliability, and industrial-grade specifications.

The ISL22424UFR16Z-TK belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in automated calibration, sensor signal conditioning, and programmable analog front-ends.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL22424UFR16Z-TK?

The ISL22424UFR16Z-TK has a total resistance tolerance of ±20% and an end-to-end temperature coefficient of ±45 ppm/°C for the 50kΩ option. These values are specified over the full −40°C to +125°C operating range and directly impact gain accuracy and drift in precision analog circuits using the ISL22424UFR16Z-TK as a programmable resistor or voltage divider.

How does the shutdown mode function in the ISL22424UFR16Z-TK?

In shutdown mode (enabled via ACR[6]), each DCP in the ISL22424UFR16Z-TK is forced into an open-circuit end-to-end state while the wiper (RWi) is shorted to its low terminal (RLi). This eliminates leakage paths and prevents unintended current flow, making the ISL22424UFR16Z-TK suitable for low-power sleep states in battery-operated or energy-conscious systems.

Can the ISL22424UFR16Z-TK operate with unipolar supplies only?

Yes - the ISL22424UFR16Z-TK can operate with unipolar supplies (e.g., VCC = 5V, V− = GND), but doing so forfeits its key bipolar advantage. When V− = GND, the DCP terminals are constrained to 0V–VCC, limiting use cases. Full specification compliance - including guaranteed DNL, INL, and wiper resistance - requires both VCC and V− within their respective ranges as defined in the ISL22424UFR16Z-TK datasheet.

What is the maximum SPI clock frequency supported by the ISL22424UFR16Z-TK?

The ISL22424UFR16Z-TK supports SPI clock frequencies up to 5 MHz, with minimum clock cycle time of 200 ns, high/low times of 100 ns each, and setup/hold times of 50 ns. These timing parameters are fully characterized and guaranteed across the entire −40°C to +125°C temperature range, ensuring robust communication in high-speed microcontroller-based calibration systems using the ISL22424UFR16Z-TK.

Does the ISL22424UFR16Z-TK support daisy-chaining multiple devices on one SPI bus?

Yes - the ISL22424UFR16Z-TK supports daisy-chain configuration via its SPI interface. In this mode, the SDO of one device connects to the SDI of the next, allowing sequential access to multiple ISL22424UFR16Z-TK units using a single CS line. This reduces MCU pin count and simplifies firmware for multi-channel calibration systems without requiring additional address decoding logic.