ADI AD669SQ/883B

The AD669SQ/883B and the AD660 family share the same BiMOS II architecture and complete DACPORT integration philosophy — the distinction is the digital interface. Where the 5962-9684601QLA AD660 addresses serial and byte-mode interface requirements with daisy-chain capability, the AD669SQ/883B is built for systems where a parallel 16-bit processor bus is the natural interface and serial loading overhead is a design constraint. In military systems based on 16-bit processor architectures — a common configuration across avionics, navigation, and weapons system electronics — the AD669’s direct bus interface with three control signals is the more efficient solution: no serialization logic, no serial clock management, no daisy-chain sequencing.

AD669SQ/883B Architecture: Parallel DACPORT for 16-Bit Bus Systems

The AD669’s double-buffered latch architecture operates with level-triggered or edge-triggered timing, selectable by pin, to accommodate the timing requirements of different military processor bus interfaces. The first-rank latch is transparent when CS and L1 are both asserted, latching data on the rising edge of either signal. The LDAC edge transfers the first-rank latch contents to the DAC register, updating the analog output. In multi-DAC systems, all AD669 devices on the bus share the same LDAC line — a single pulse simultaneously updates all channels, eliminating the skew that sequential update schemes introduce in precision multi-channel applications. The on-chip buried Zener reference, laser-trimmed to 10.000V with ±0.2% maximum error, is available at a pin for external use with up to 2 mA of drive current, making it a shared reference source for other signal chain components when sufficient for the external load.

AD669SQ/883B vs AD660 and AD7846: 16-Bit DAC Interface Selection

Three qualified 16-bit DACs from Analog Devices address different interface requirements in military signal chain design:

The AD669SQ/883B is the correct choice for 16-bit parallel bus architectures where direct bus interface with minimal control overhead is the priority. For serial interface and daisy-chain multi-DAC applications, the AD660 is the better fit. For closed-loop control applications requiring 16-bit guaranteed monotonicity and readback, the AD7846 is the appropriate selection.

Sourcing the ADI AD669SQ/883B

The AD669SQ/883B in its hermetic CERDIP package maintains consistent demand in military avionics and navigation programs where parallel 16-bit bus interface and MIL-STD-883B qualification are both required. We carry verified inventory with full lot traceability, certificate of conformance, and anti-counterfeit inspection on every order. Contact us today to confirm availability and request a quote — our team responds within 24 hours.

• Direct 16-bit parallel bus interface — three control signals, no serialization or clock management required
• Level-triggered and edge-triggered timing modes selectable by pin — accommodates different military processor bus protocols
• On-chip buried Zener reference available at pin for external signal chain use at up to 2 mA
• Double-buffered latches support simultaneous LDAC update across all AD669SQ/883B devices in multi-DAC systems
• Production-tested AC specifications — 83 dB SNR and 0.009% THD+N confirmed on every shipped device
• Hermetic CERDIP package rated for –55°C to +125°C — appropriate for all military platform categories
• MIL-STD-883B certificate of conformance and full lot traceability on every order
• Export-compliant global shipping for defense and aerospace program procurement

Frequently Asked Questions (FAQ)

What Is the ADI AD669SQ/883B and How Does It Differ From the AD660?

The AD669SQ/883B is a complete 16-bit parallel DACPORT processed to MIL-STD-883B, with a 28-lead hermetic CERDIP package rated for –55°C to +125°C military operation. The 5962-9684601QLA AD660 uses a serial or 2×8-bit byte interface with daisy-chain capability. Both integrate the same 10V buried Zener reference and complete DACPORT feature set — the selection depends on whether the system has a parallel 16-bit bus or a serial interface available.

How Does the Double-Buffered Latch Work on the AD669SQ/883B?

The double-buffered structure uses two latch ranks. The first rank is transparent to the bus when CS and L1 are asserted, accepting new data without disturbing the DAC output. The LDAC edge transfers the first-rank contents to the second rank, which drives the DAC core and updates the analog output. In multi-DAC systems, all AD669 devices share a common LDAC line — a single pulse simultaneously updates all channels, eliminating inter-channel timing skew.

Does the AD669SQ/883B Require an External Voltage Reference?

No. The on-chip buried Zener reference, laser-trimmed to 10.000V with ±0.2% maximum error, drives both the internal DAC core and is available at the REF OUT pin for external use at up to 2 mA of drive current. For designs requiring lower drift than the internal reference provides, an external precision reference such as the 5962-9078501MLA AD780S can override the internal reference through the REF IN pin.

What Is the Difference Between the AD669SQ/883B and the AD669SQ?

The AD669SQ uses the same hermetic CERDIP package and is rated for –55°C to +125°C, but without the MIL-STD-883B processing and qualification documentation. The AD669SQ/883B carries full 883B screening with lot traceability and certificate of conformance — required for DoD procurement from the qualified sources list.

How Do I Request a Quote for the ADI AD669SQ/883B?

Submit an inquiry through our website contact form or email our sales team directly. We will respond within 24 hours with pricing, availability, and lead time — and can discuss long-term supply agreements for production programs.