Analog Devices Inc./Maxim Integrated DS1803Z-100

Overview

DS1803Z-100 from Maxim Integrated is a dual-channel, volatile digital potentiometer with 256-position resolution per channel, 100kΩ end-to-end resistance, 2-wire I²C-compatible serial interface, and industrial temperature range (-40°C to +85°C). It serves as a programmable analog gain/offset adjustment element in precision sensor signal conditioning circuits.

For engineers reviewing the DS1803Z-100 datasheet, DS1803Z-100 pinout, DS1803Z-100 application, or DS1803Z-100 equivalent, key selection criteria include wiper position volatility on power-up, 100kΩ resistor tolerance (±20%), 400kHz max I²C clock rate, and SOIC-16 package compatibility with surface-mount production workflows.

Technical Context

The DS1803Z-100 implements two independent 8-bit wiper registers controlling 256-tap resistor arrays, each with H/W/L terminals. Communication uses a standard 2-wire bus where the device operates exclusively as a slave, responding to control byte 0101xxxR/W with A2–A0 address bits.

It is a volatile device: wiper positions reset to 00h (L-terminal) at power-on. The 100kΩ total resistance yields ~392Ω/step resolution (100kΩ/255), with absolute linearity ±0.75 LSB and temperature coefficient 750 ppm/°C - critical for stable analog tuning across thermal cycling.

Key Specifications

Pinout & Package

DS1803Z-100 is packaged in a 16-pin SOIC (150 mil) surface-mount package with 1.27mm pitch, footprint compatible with JEDEC MS-012AC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42100-E/P, the DS1803Z-100 offers I²C compatibility in SOIC-16, making it optimal for space-constrained industrial boards using ARM or STM32 MCUs with limited SPI peripherals but abundant I²C buses.

Availability

DS1803Z-100 is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable power supplies, and embedded audio subsystems requiring stable component supply and long-term manufacturability.

Supply support for DS1803Z-100 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 (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets.

The DS1803Z-100 belongs to Maxim's digital potentiometer product line, engineered for precision analog trimming in harsh-environment embedded systems where reliability and I²C simplicity are prioritized over nonvolatility.

FAQ

Does the DS1803Z-100 retain wiper position after power loss?

No, the DS1803Z-100 is a volatile digital potentiometer. Upon power-up, both wipers reset to position 00h (connected to L0/L1 terminals). Host firmware must reinitialize the DS1803Z-100 wiper values after each power cycle to restore desired analog settings. This behavior is inherent to the DS1803Z-100 architecture and documented in its DEVICE OPERATION section.

What is the maximum allowable voltage across the DS1803Z-100 resistor terminals?

The DS1803Z-100 specifies that analog signals applied between Hx and Lx terminals must not exceed the VCC supply voltage. For example, with VCC = 5V, the maximum differential voltage across either potentiometer is 5V. Exceeding this violates the RECOMMENDED OPERATING CONDITIONS and risks parametric shift or damage. This limit applies directly to the DS1803Z-100 and is confirmed in its Absolute Maximum Ratings table.

Can multiple DS1803Z-100 devices share the same I²C bus?

Yes, up to eight DS1803Z-100 devices can operate on a single I²C bus using hardware address lines A0, A1, and A2. Each DS1803Z-100 responds only to its unique 3-bit address encoded on these pins, allowing individual read/write access without bus contention. This multi-drop capability is explicitly supported by the DS1803Z-100 control byte structure and verified in its SLAVE ADDRESS section.

What is the -3dB bandwidth of the DS1803Z-100 at 100kΩ?

The DS1803Z-100 has a -3dB cutoff frequency of 100kHz when configured with its nominal 100kΩ end-to-end resistance. This value is specified in Note 11 of the ANALOG RESISTOR CHARACTERISTICS table and reflects the RC-limited bandwidth due to internal parasitic capacitance interacting with the 100kΩ resistance. It defines the maximum usable signal frequency before significant amplitude attenuation occurs in the DS1803Z-100.

Is the DS1803Z-100 pin-compatible with other DS1803 variants like DS1803E-100?

No, the DS1803Z-100 (16-pin SOIC) is not pin-compatible with DS1803E-100 (14-pin TSSOP). While both share identical electrical functionality and register mapping, their pin counts, pinouts, and physical footprints differ - DS1803Z-100 uses pins 2 and 15 as NC, whereas DS1803E-100 repurposes those locations for additional functions. Board layout must match the specific package variant; the DS1803Z-100 requires the 16-pin SOIC footprint.