Renesas ISL22424WFR16Z-TK

Overview

ISL22424WFR16Z-TK from Renesas Electronics (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with SPI interface, 256-tap resolution, 10kΩ end-to-end resistance, and dual-supply operation (VCC = 2.25–5.5V, V− = −2.25 to −5.5V). It integrates two independent DCPs, non-volatile initial value registers (IVR), volatile wiper registers (WR), and 13 general-purpose non-volatile registers. Used for precision analog trimming in bipolar signal paths such as programmable gain amplifiers and offset calibration circuits.

For engineers reviewing the ISL22424WFR16Z-TK datasheet, ISL22424WFR16Z-TK pinout, ISL22424WFR16Z-TK application, or ISL22424WFR16Z-TK equivalent, key selection criteria include dual-rail voltage support, ±3.0mA max wiper current, 70Ω typical wiper resistance, 1.5µs wiper response time, and QFN-16 package compatibility with industrial temperature range (−40°C to +125°C).

Technical Context

The ISL22424WFR16Z-TK implements two independent resistor arrays using CMOS switch-based ladder networks, each with 256 discrete tap positions controlled via SPI Mode 0 (rising-edge input, falling-edge output). Wiper position is stored in volatile WR registers and recalled from non-volatile IVR registers at power-up.

It supports daisy-chain SPI configuration, shutdown mode (wiper shorted to RL, DCP open-circuit), and dual-supply biasing enabling true bipolar terminal voltage swing (V− to VCC). The device features make-before-break switching, 1000k-cycle EEPROM endurance, and 50-year data retention at ≤+55°C.

Key Specifications

Pinout & Package

ISL22424WFR16Z-TK is housed in a 16-lead QFN (4mm × 4mm, L16.4x4A), thermally enhanced with exposed die pad internally connected to V−. Pin functions are validated per FN6425 Rev 1.00, Page 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the ISL22424WFR16Z-TK uniquely delivers dual-channel trimming with native dual-supply operation-enabling direct integration into ±5V signal chains without auxiliary power or level-shifting components.

Availability

ISL22424WFR16Z-TK is available at Aetrix Electronics and suitable for programmable gain amplifiers, DC offset calibration circuits, bipolar signal conditioning modules, and audio channel balance control requiring stable component supply across automotive, industrial, and test equipment lifecycles.

Supply support for ISL22424WFR16Z-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 Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for industrial, automotive, and infrastructure markets.

The ISL22424WFR16Z-TK belongs to Renesas' XDCP™ family of digitally controlled potentiometers, engineered for high-reliability analog trimming in harsh environments with extended temperature operation and non-volatile configuration retention.

FAQ

What is the operating temperature range for the ISL22424WFR16Z-TK?

The ISL22424WFR16Z-TK is rated for the extended industrial temperature range of −40°C to +125°C. This specification is validated per FN6425 Rev 1.00, Page 5, and applies across all electrical parameters including wiper resistance, INL, DNL, and supply current. Operation outside this range may result in parametric deviation or reliability risk.

Does the ISL22424WFR16Z-TK support daisy-chaining multiple devices on one SPI bus?

Yes, the ISL22424WFR16Z-TK supports daisy-chain configuration as documented in FN6425 Rev 1.00, Page 15. Multiple devices can share SCK, SDI, and CS lines, with SDO of one device connected to SDI of the next. The last device's SDO returns data to the host, enabling efficient multi-device programming without additional GPIO overhead.

How does the shutdown mode affect the DCP terminals of the ISL22424WFR16Z-TK?

In shutdown mode (SHDN bit = 0 in ACR), each DCP is forced into an open-circuit state between RH and RL, while the wiper (RW) is internally shorted to its corresponding RL terminal. This behavior is confirmed in FN6425 Rev 1.00, Figure 15 and Page 13. Shutdown reduces total supply current to <4µA and isolates analog paths from unintended loading.

What is the maximum SPI clock frequency supported by the ISL22424WFR16Z-TK?

The ISL22424WFR16Z-TK supports SPI clock frequencies up to 5MHz, as specified in FN6425 Rev 1.00, Page 8 under "fSCK". Timing parameters-including tSU (50ns setup), tH (50ns hold), and tCYC (200ns cycle)-are guaranteed across the full operating temperature and voltage range, enabling robust high-speed configuration in real-time control loops.

Can the ISL22424WFR16Z-TK be used with unipolar supplies only?

Yes, the ISL22424WFR16Z-TK functions with unipolar supplies: V− can be connected to GND (0V) while VCC operates from 2.25V to 5.5V. In this configuration, DCP terminals swing from 0V to VCC. However, the full benefit of bipolar operation (V− negative) is forfeited, and the device remains fully functional as a standard dual DCP with SPI interface and non-volatile storage.