AD7847ARZ-REEL

Overview

The AD7847ARZ-REEL is a dual 12-bit monolithic digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features two independent voltage-output DACs with internal feedback resistors, eliminating the need for external components. The device operates on ±15 V power supplies and accepts parallel digital data via a common Write (WR) input and separate Chip Select (CSA/CSB) inputs. Key electrical specifications include a settling time of 3 µs to within ±1/2 LSB, a full-power bandwidth of 175 kHz, and a total harmonic distortion of –88 dB. The unit is housed in a 24-lead SOIC package and supports an industrial temperature range of –40°C to +85°C.

Feature Summary

• Dual 12-bit resolution with internally connected feedback resistors for simplified circuit design.
• Parallel interface utilizing edge-triggered latches controlled by CSA, CSB, and WR signals.
• High-speed performance with 3 µs settling time and 175 kHz full-power bandwidth.
• Low glitch impulse of 10 nV-sec and channel-to-channel isolation of –95 dB.

Applications

• Programmable gain amplifier circuits requiring precise analog resistance control.
• Analog panning systems for audio signal distribution between channels.
• Four-quadrant multiplication applications using bipolar offset binary coding.

Procurement Notes

Verify that the specific ordering suffix '-REEL' corresponds to the tape-and-reel packaging format rather than tube packaging when sourcing this component. Confirm the 'A' version designation aligns with the required ±1 LSB relative accuracy specification and the –40°C to +85°C operating temperature range. Ensure compatibility with standard ±15 V supply rails during procurement planning.

Selection Notes

Select the AD7847ARZ-REEL over the AD7837 variant if independent chip select lines for each DAC are required, as the AD7847 utilizes separate CSA and CSB inputs instead of a single CS and address logic. This model is suitable for designs needing simultaneous or independent updating of two channels without external multiplexing. Verify that the 12-bit resolution and ±15 V operation meet the system's dynamic range and power supply constraints.

Part Context

This component belongs to the AD7837/AD7847 family of high-speed, low-power monolithic DACs. While the AD7837 uses an 8-bit bus with address lines for latch selection, the AD7847 provides a direct 12-bit parallel interface with dedicated chip selects. The 'R' suffix indicates the SOIC-24 package option, and the '-REEL' suffix denotes the reel packaging configuration for automated assembly.

Replacement Considerations

The AD7847BRZ offers improved relative accuracy of ±1/2 LSB compared to the ±1 LSB of the AD7847ARZ. Both parts share identical pinouts, interfaces, and electrical timing characteristics, allowing for potential drop-in upgrades where higher linearity is required.