AS1504-T

Digital To Analog Converters Overview

The AS1504-T is an octal, individually programmable 8-bit digital-to-analog converter (DAC) from ams-OSRAM USA INC. It features eight DAC channels sharing a common high-side reference input (VREFH), with VREFL internally tied to ground. The device operates on a single +3V to +5V supply and consumes low power, drawing only 5µA at 5V in normal mode and ≤25µW in shutdown. Control is managed via a standard 3-wire serial interface (CLK, CSN, SDI). A key feature of the AS1504 variant is the Mid-Scale Reset pin (RSN), which loads all DAC latches with code 80h upon activation. The component is housed in a 16-pin SOIC-150 narrow package.

Digital To Analog Converters Feature Summary

• Octal 8-Bit Resolution: Eight individually addressable DAC outputs (OUT1–OUT8) with 8-bit data resolution.
• Mid-Scale Reset: Dedicated RSN pin forces all DAC outputs to mid-scale (code 80h) for simplified initialization.
• Low Power Consumption: Typical supply current of 5µA at 5V; shutdown mode dissipates ≤25µW while maintaining latch settings.
• Standard Serial Interface: Controlled via 3-wire synchronous interface (CLK, CSN, SDI) compatible with CMOS/TTL logic levels.

Digital To Analog Converters Applications

• Video amplifier gain control
• Video equipment voltage-controlled frequencies and bandwidths
• CRT display geometric corrections and automatic adjustments

Digital To Analog Converters Procurement Notes

Verify that the specific order suffix '-T' corresponds to the Tape and Reel delivery form as listed in the manufacturer's ordering information. Confirm that the application does not require the separate VREFL range setting feature, which is exclusive to the AS1505 model. Ensure the design accommodates the 16-pin SOIC-150 package dimensions and thermal characteristics.

Digital To Analog Converters Selection Notes

Select the AS1504-T when a mid-scale reset function is required to initialize DAC outputs to a known state (code 80h). This model is suitable for applications where the lower reference voltage is fixed at ground (VREFL = GND). If independent zero-scale adjustment via an external VREFL pin is necessary, the AS1505 model should be selected instead. Ensure the supply voltage remains within the +3V to +5V range.

Digital To Analog Converters Part Context

The AS1504-T belongs to the AS1504/AS1505 family of octal 8-bit DACs manufactured by austriamicrosystems AG (now ams-OSRAM). The 'T' suffix denotes the tape and reel packaging format. The AS1504 variant is distinguished from the AS1505 by its internal connection of VREFL to ground and the inclusion of the RSN pin for mid-scale reset functionality.

Digital To Analog Converters Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility if replacing obsolete components, noting that the AS1505 offers similar functionality but lacks the mid-scale reset pin and includes a separate VREFL pin.