5962-8770201RX

Overview

The AD7545 is a monolithic 12-bit CMOS multiplying digital-to-analog converter (DAC) featuring onboard data latches. It accepts a single 12-bit wide word and directly interfaces with most 12- and 16-bit bus systems via parallel inputs. The device operates on a single supply voltage ranging from +5 V to +15 V, dissipating less than 0.5 mW at +5 V with CMOS logic levels. Key static performance metrics include a typical gain temperature coefficient of 2 ppm/°C, a current settling time of 2 µs to 1/2 LSB, and a digital-to-analog glitch impulse of 400 nV·sec. The architecture utilizes an R-2R ladder network with N-channel current steering switches.

Feature Summary

• 12-bit resolution with onboard TTL-compatible data latches for direct bus interfacing.
• Single +5 V to +15 V supply operation with low power consumption (<0.5 mW at 5 V).
• Multiplying capability allowing VREF to be driven by AC or DC signals of positive or negative polarity.
• Latch-free design eliminating the need for Schottky protection diodes.

Applications

• Battery-operated equipment requiring low power consumption.
• Applications involving wide temperature variations due to stable gain characteristics.
• Microprocessor systems using 8-bit or 16-bit buses for direct data loading.
• Voltage switching mode circuits utilizing constant output impedance.

Procurement Notes

Verify the specific grade suffix (e.g., J, K, L, A, B, C, S, T, U) to confirm the operating temperature range and accuracy class. Military-grade parts require the /883B suffix per MIL-STD-883 Class B process. Confirm package type availability, as Analog Devices may ship ceramic packages (D-20) in lieu of cerdip (Q-20). Ensure ESD precautions are observed during handling.

Selection Notes

Select based on required accuracy and temperature range: J/A/S grades offer ±2 LSB relative accuracy; K/B/T offer ±1 LSB; L/C/U offer ±1/2 LSB; GL/GC/GU offer ±1/2 LSB with ±1 LSB gain error. Choose N-20 (Plastic DIP), Q-20 (Cerdip), P-20A (PLCC), or E-20A (LCCC) based on mounting requirements. Note that 'G' versions guarantee lower gain error, potentially reducing the need for external trim resistors.

Part Context

The AD7545 is part of the AD7545 family of CMOS multiplying DACs. It serves as a foundational component for analog signal generation and attenuation in mixed-signal systems. The datasheet references DESC drawing 5962-87702 for standard military drawings, indicating its use in defense and aerospace applications when ordered with appropriate processing suffixes.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Cross-referencing requires matching 12-bit resolution, parallel interface, and multiplying functionality within the same supply voltage range.