Analog Devices Inc./Maxim Integrated DS1050U-010+

Overview

DS1050U-010+ from Maxim Integrated (now Analog Devices) is a 5-bit programmable pulse-width modulator IC with fixed 10kHz output frequency, 2-wire serial interface, and 8-pin 118-mil SOP package. It delivers adjustable duty cycle from 0% to 100% in 3.125% steps, operates from 2.7V to 5.5V, and draws only 50µA typical active current. It serves as a compact, digitally controlled PWM source for LCD bias, LED dimming, and voltage regulation in space-constrained embedded systems.

For engineers reviewing the DS1050U-010+ datasheet, DS1050U-010+ pinout, DS1050U-010+ application, or DS1050U-010+ equivalent, key selection considerations include its 10kHz nominal frequency tolerance (±20%), 5-bit resolution (0–96.88% via register + dedicated 100% command), I²C-compatible 2-wire interface with hardware address pins (A0–A2), and low-power shutdown mode (<1µA).

Technical Context

The DS1050U-010+ integrates an internal oscillator tuned to 10kHz, a 5-bit PWM register, and a 2-wire slave interface compliant with both standard (100kHz) and fast-mode (400kHz) I²C timing. Its PWM output swings rail-to-rail (0V to VCC) with 2mA drive capability and supports full-on (100%) and shutdown commands via dedicated protocol bytes.

Addressing is implemented via three hardware-selectable pins (A0, A1, A2), enabling up to eight devices on one bus. The device powers up at 50% duty cycle (10000B), allowing immediate use without configuration - ideal for simple standalone timing control where digital reprogramming is optional.

Key Specifications

Pinout & Package

DS1050U-010+ uses an 8-pin 118-mil SOP package (JEDEC MS-012 variant), footprint-compatible with industry-standard 8-lead narrow SO packages but with reduced width for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable PWM generator applications.

Compared with DS1050U-010+, DS1050Z-010+ offers identical electrical behavior in a larger SOIC package, easing layout and assembly; MAX16833AUB+ delivers higher integration and power handling but demands redesign and adds cost - making DS1050U-010+ optimal for low-current, space-sensitive, digitally tunable PWM generation.

Availability

DS1050U-010+ is available at Aetrix Electronics and suitable for LCD bias control, LED dimming, and DC-DC feedback adjustment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and voltage ranges.

Supply support for DS1050U-010+ 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

Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications - emphasizing reliability, parametric consistency, and long-term product availability.

The DS1050U-010+ belongs to Maxim's programmable timing and control product line, engineered specifically for low-cost, low-power digital-to-analog control tasks where microcontroller resources are constrained or where deterministic PWM timing is required without software overhead.

FAQ

What is the nominal output frequency of the DS1050U-010+ and how stable is it across conditions?

The DS1050U-010+ has a nominal output frequency of 10kHz. Its absolute frequency tolerance is ±20% over the full operating range (–40°C to +85°C, VCC = 2.7V to 5.5V), as specified in the AC Electrical Characteristics table. Measured data shows typical deviation of ±0.5% at 25°C and ±1.5% over temperature at 3V and 5V supply - sufficient for non-critical analog control loops like LCD bias or LED dimming where exact frequency is secondary to duty-cycle accuracy.

Does the DS1050U-010+ support true 100% duty cycle, and how is it enabled?

Yes, the DS1050U-010+ supports true 100% duty cycle via a dedicated "Set PWM Duty Cycle 100%" command (Figure 4b). Unlike the standard 5-bit register (which caps at 96.88%), this command forces PWMO to remain high continuously. This is implemented as a separate protocol byte with R/W=0 and specific data bits - ensuring full-on operation without relying on register value interpretation or external circuitry.

What are the voltage thresholds for logic-high and logic-low inputs on the DS1050U-010+?

Per the DC Electrical Characteristics table, the DS1050U-010+ defines logic-high input (VIH) as ≥0.7 × VCC and logic-low input (VIL) as ≤0.3 × VCC. For example, at VCC = 3.3V, VIH ≥ 2.31V and VIL ≤ 0.99V; at VCC = 5.0V, VIH ≥ 3.5V and VIL ≤ 1.5V. These thresholds ensure robust noise immunity and compatibility with standard CMOS and TTL logic families.

Can multiple DS1050U-010+ devices share the same I²C bus, and how is addressing managed?

Yes, up to eight DS1050U-010+ devices can operate on a single 2-wire bus using hardware address pins A0, A1, and A2. Each pin must be hardwired to either VCC or GND to set a unique 3-bit slave address (000–111 binary). The device responds only when the 7-bit address in the command/control byte matches its configured address - enabling coordinated control without software arbitration or bus contention.

What is the maximum capacitive load the DS1050U-010+ SDA and SCL lines can drive reliably?

The DS1050U-010+ supports a maximum bus capacitance (CB) of 400pF per line in standard mode and 400pF in fast mode, as stated in the AC Electrical Characteristics table. Rise/fall times scale with CB (tR/tF = 20 + 0.1×CB ns), so at 400pF, tR/tF ≤ 60ns - well within fast-mode limits. For reliable operation beyond 400pF, add series resistance or buffer drivers; layout best practices (short traces, ground plane) are recommended to minimize stray capacitance.