DS1808Z-050+T&R

Digital Potentiometers Overview

The DS1808Z-050+T&R is a dual-channel, digitally controlled logarithmic potentiometer manufactured by Analog Devices Inc./Maxim Integrated. It features two independent 32-position log-taper channels with a standard end-to-end resistance of 45kΩ and a total attenuation range of 60dB. The device utilizes a 2-Wire serial interface (SDA/SCL) for control and includes a mute position providing over 90dB of attenuation. It operates on dual supplies ranging from ±5V to ±13.2V or a single +12V supply, with a digital logic supply of 4.5V to 5.5V. The component is housed in a 16-pin SOIC package and supports an industrial operating temperature range of -40°C to +85°C.

Digital Potentiometers Feature Summary

• Dual-channel architecture with closely matched log-taper characteristics and less than 0.5dB interchannel tracking error.
• 60dB attenuation range achieved through variable step sizes: 1dB per step for the first 12 taps, 2dB for the next 12, and 3dB for the final 8 taps.
• Industry-standard 2-Wire serial interface supporting up to eight devices on a single bus via hardware address pins A0-A2.
• Power-up default to mute position (>90dB attenuation) ensures signal isolation upon initialization.

Digital Potentiometers Applications

• Stereo volume control circuits requiring logarithmic response curves.
• Low-cost audio processing systems needing digitally adjustable gain or attenuation.
• Multi-device audio buses where multiple potentiometers are addressed via a shared 2-Wire serial port.

Digital Potentiometers Procurement Notes

Verify that the ordering suffix T&R indicates tube packaging rather than tape and reel, as this designation may contradict standard industry conventions. Confirm the specific resistor tolerance and package dimensions against the manufacturer's latest datasheet revision before finalizing procurement specifications.

Digital Potentiometers Selection Notes

Select this component when a logarithmic response curve is required for audio applications, as opposed to linear taper models like the DS1804. Ensure the design accommodates dual power supplies (±12V typical) or a single positive rail if using the substrate bias pin appropriately. Verify that the 45kΩ end-to-end resistance aligns with the impedance requirements of the connected circuitry.

Digital Potentiometers Part Context

The DS1808 belongs to the Maxim Integrated family of dual-channel digital potentiometers designed specifically for audio applications. Unlike volatile linear potentiometers such as the DS1804, the DS1808 provides logarithmic attenuation profiles suitable for human hearing perception. The Z suffix typically denotes the SOIC package variant within this product line.

Digital Potentiometers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current equivalent components if the DS1808 series is discontinued or unavailable.

Digital Potentiometers FAQ

What is the wiper position behavior upon power-up?

The DS1808 is a volatile device that powers up with the wiper positions set to the mute position (decimal value 33), providing greater than 90dB of signal attenuation.

How is the 60dB attenuation range distributed across the taps?

The attenuation is non-linear: it provides 1dB per step for the first 12 taps, 2dB per step for the next 12 taps, and 3dB per step for the bottom 8 taps.

Can the DS1808 operate with a single power supply?

Yes, the device can be powered by a single +12V source. In this configuration, the VB pin is set to 0V, and maximum input signals are restricted to the single supply voltage rails.