Analog Devices Inc. LTC2634CMSE-LZ8#PBF

Overview

LTC2634CMSE-LZ8#PBF from Analog Devices is a quad 8-bit rail-to-rail voltage-output DAC with integrated 10ppm/°C precision reference, housed in a 10-lead MSOP package. It delivers 2.5V full-scale output from a 2.7V–5.5V supply, guarantees monotonicity over −40°C to 85°C, and features SPI/MICROWIRE-compatible 3-wire serial interface up to 50MHz-enabling precise analog control in compact industrial sensor interfaces.

For engineers reviewing the LTC2634CMSE-LZ8#PBF datasheet, LTC2634CMSE-LZ8#PBF pinout, LTC2634CMSE-LZ8#PBF application, or LTC2634CMSE-LZ8#PBF equivalent, key selection criteria include zero-scale power-on reset behavior, internal reference accuracy (±0.5 LSB INL), rail-to-rail output drive capability, low 0.6mA supply current at 3V, and guaranteed monotonicity across temperature.

Technical Context

The LTC2634CMSE-LZ8#PBF implements four independent 8-bit DAC channels sharing a single 2.5V internal reference with 10ppm/°C drift. Its double-buffered architecture supports asynchronous LDAC-triggered simultaneous updates, while hardware CLR enables level-triggered zero-scale reset. The device operates exclusively in internal reference mode with fixed zero-scale power-on reset (Z suffix).

It uses a 32-bit shift register for command/data input, accepts 24- or 32-bit words, and provides rail-to-rail buffered outputs capable of sourcing/sinking ±27mA. No SDO, LDAC, or CLR pins are present in the MSOP package-only the QFN variant includes those features.

Key Specifications

Pinout & Package

Package: 10-lead MSOP (MSE), 3mm × 3mm body, exposed pad (Pin 11) connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad DAC applications.

Compared with AD5686RBCPZ-RL7 and MCP4822-E/SN, the LTC2634CMSE-LZ8#PBF uniquely combines guaranteed monotonicity across −40°C to 85°C, deterministic zero-scale power-on reset, and rail-to-rail output in a compact MSOP-making it optimal for safety-aware industrial control loops.

Availability

LTC2634CMSE-LZ8#PBF is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable bias control, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for LTC2634CMSE-LZ8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2634 product line delivers precision, low-power, quad DAC solutions optimized for space-constrained industrial control, sensor conditioning, and calibration systems requiring deterministic startup behavior and minimal external components.

FAQ

What is the power-on reset behavior of the LTC2634CMSE-LZ8#PBF?

The LTC2634CMSE-LZ8#PBF powers up with all four DAC outputs forced to zero-scale (0V) due to its Z-suffix designation. This behavior is hardware-enforced and occurs regardless of supply ramp rate, ensuring repeatable initialization for safety-critical systems. The internal reference also powers up simultaneously, eliminating settling delays before first update.

Does the LTC2634CMSE-LZ8#PBF support external reference operation?

No-the LTC2634CMSE-LZ8#PBF is factory-configured for internal reference mode only (L-suffix = 2.5V full-scale). The REF pin functions solely as a 1.25V reference output (half-scale), not an input. External reference operation requires part numbers with M or X suffixes (e.g., LTC2634CMSE-LMX8#PBF), which are distinct variants.

Can the LTC2634CMSE-LZ8#PBF drive capacitive loads directly?

Yes-the LTC2634CMSE-LZ8#PBF's rail-to-rail output buffers are specified to drive up to 500pF capacitively without instability. For larger loads (e.g., >1nF), an external unity-gain buffer is recommended. The internal reference output (REF pin) supports up to 10µF bypass capacitance, improving noise performance and stability.

What is the maximum update rate for all four DACs simultaneously using the LTC2634CMSE-LZ8#PBF?

The LTC2634CMSE-LZ8#PBF achieves simultaneous 4-channel updates in under 640ns using the LDAC pin-but this feature is unavailable in the MSOP package. In the LTC2634CMSE-LZ8#PBF, updates occur sequentially via SPI write, requiring four 24-bit writes (~1.92µs at 50MHz SCK). True simultaneous update requires the QFN variant (e.g., LTC2634CUD-LZ8#PBF) with LDAC support.

Is the LTC2634CMSE-LZ8#PBF RoHS-compliant and lead-free?

Yes-the #PBF suffix explicitly denotes lead-free (Pb-free) and RoHS-compliant construction. The LTC2634CMSE-LZ8#PBF meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for standard reflow soldering profiles, including peak temperatures up to 260°C.