Analog Devices Inc./Maxim Integrated DS1267S-050/T&R

Overview

DS1267S-050/T&R from Maxim Integrated (now Analog Devices) is a dual 256-position digital potentiometer IC with 50 kΩ end-to-end resistance per channel, 3-wire serial interface (RST/CLK/DQ), ±0.3 LSB relative linearity, and industrial temperature range (–40°C to +85°C). It enables precise, nonvolatile wiper position control in programmable gain amplifiers, sensor calibration circuits, and DC bias adjustment networks.

For engineers reviewing the DS1267S-050/T&R datasheet, DS1267S-050/T&R pinout, DS1267S-050/T&R application, or DS1267S-050/T&R equivalent, this page delivers verified package mapping (16-pin SOIC), confirmed terminal roles (W0/W1, H0/H1, L0/L1, SOUT, COUT), real-world stacking and cascading behavior, and validated alternative options for dual-channel digital potentiometer replacement.

Technical Context

The DS1267S-050/T&R implements two independent 8-bit-controlled resistive arrays, each with 256 tap points and temperature-compensated resistive elements. Its 17-bit I/O shift register stores two 8-bit wiper positions plus a stack-select bit, enabling series connection of both pots for 512-step resolution.

Communication uses a synchronous 3-wire serial protocol requiring RST activation, CLK-synchronized DQ data input, and supports daisy-chained operation via COUT-to-DQ feedback. The device operates at up to 10 MHz CLK frequency with 50 ns timing margins and draws only 22 µA typical supply current in standby.

Key Specifications

Pinout & Package

DS1267S-050/T&R is housed in a 16-pin SOIC (300-mil) package with gull-wing leads, JEDEC MS-012AC compliant, 10.3 mm × 7.5 mm body size, and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel digital potentiometer applications.

Compared with DS1267S-050/T&R, AD5232BRUZ100 adds nonvolatility but requires SPI redesign and offers no stacking output, while MCP42050-I/P matches resistance and resolution but omits cascading and stacked configuration-making DS1267S-050/T&R uniquely suited for multi-device analog control buses.

Availability

DS1267S-050/T&R is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration systems, and DC bias adjustment networks requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial OEM programs.

Supply support for DS1267S-050/T&R 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

Maxim Integrated (acquired by Analog Devices in 2021) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low-power operation and high-reliability performance.

The DS1267S-050/T&R belongs to Maxim's digital potentiometer product line, engineered specifically for replacing mechanical trimmers in automated calibration, gain control, and sensor compensation circuits where repeatable, software-configurable resistance is essential.

FAQ

What is the exact end-to-end resistance value of DS1267S-050/T&R?

The DS1267S-050/T&R has a nominal end-to-end resistance of 50 kΩ per potentiometer channel, with a tolerance of ±20% over temperature and process variation. This value is laser-trimmed during manufacturing and remains stable across the –40°C to +85°C operating range, supporting accurate gain and attenuation calculations in precision analog designs.

Does DS1267S-050/T&R retain wiper settings after power cycling?

No, DS1267S-050/T&R is a volatile digital potentiometer: wiper positions reset to mid-scale (128, or 50% resistance) on power-up. It does not include EEPROM or nonvolatile memory. To maintain calibrated settings, the host controller must reinitialize the DS1267S-050/T&R via its 3-wire serial interface during system startup.

Can DS1267S-050/T&R be used in stacked configuration, and how is it enabled?

Yes, DS1267S-050/T&R supports stacking: connecting both potentiometers in series doubles total resistance to 100 kΩ and increases resolution to 512 steps. Stacking is enabled by setting bit 0 (stack select bit) in the 17-bit I/O shift register; SOUT then outputs either W0 or W1 based on that bit, allowing single-point access to the combined wiper.

What is the function of the VB pin on DS1267S-050/T&R?

The VB (substrate bias) pin on DS1267S-050/T&R must be connected to GND or a voltage ≤ GND (down to –5.5 V) to ensure proper MOSFET switch operation within the resistive array. Incorrect VB bias causes increased wiper resistance variation and potential nonmonotonic behavior. It is not a power supply pin but a critical substrate control node.

Is DS1267S-050/T&R pin-compatible with other DS1267 variants like DS1267S-010 or DS1267S-100?

Yes, all DS1267S-x variants (010, 050, 100) share identical 16-pin SOIC pinouts, terminal functions, and serial interface timing. Only the end-to-end resistance differs (10 kΩ, 50 kΩ, 100 kΩ). This allows direct substitution in existing layouts when resistance scaling is acceptable - no PCB or firmware changes are required beyond recalibrating gain/attenuation coefficients.