Analog Devices Inc. LTC2640ITS8-HZ8#TRMPBF

Overview

LTC2640ITS8-HZ8#TRMPBF from Analog Devices is a single 8-bit voltage-output DAC with integrated 4.096V, 10ppm/°C reference, rail-to-rail output buffer, and SPI/MICROWIRE-compatible 3-wire serial interface. It operates from 4.5V to 5.5V, delivers ±0.5LSB DNL and ±0.5LSB INL (max), and features power-on reset to zero-scale - used in precision analog control loops within industrial sensor conditioning and optical transceiver biasing.

For engineers reviewing the LTC2640ITS8-HZ8#TRMPBF datasheet, LTC2640ITS8-HZ8#TRMPBF pinout, LTC2640ITS8-HZ8#TRMPBF application, or LTC2640ITS8-HZ8#TRMPBF equivalent, key selection criteria include guaranteed monotonicity over –40°C to 125°C, low 1.8µA max power-down current (H-grade), 4.6µs ±1LSB settling time at 5V, and TSOT-23-8 package compatibility with space-constrained embedded systems.

Technical Context

The LTC2640ITS8-HZ8#TRMPBF implements a resistor-divider-based DAC architecture with double-buffered input and DAC registers, enabling synchronous updates via Write+Update command (0b0011). Its internal 4.096V reference is buffered and available at REF pin with ±10ppm/°C drift, supporting both internal-reference mode (full-scale = 4.096V) and external-reference mode (0V to VCC).

It uses level-triggered CS/LD for SPI framing, accepts 24-bit words (4-bit command + 4 don't-care + 8 data + 8 don't-care), and incorporates hardware asynchronous clear (CLR) for immediate zero-scale reset. Power-on reset circuitry forces output to zero-scale at VCC ramp-up, minimizing glitch amplitude (<5mV) when supply ramps ≥1ms to 5V.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (ThinSOT™), 3mm × 1.7mm footprint, 0.65mm pitch, thermal resistance θ_JA = 195°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-output DAC applications.

Compared with MCP4802-E/P and AD5620BRJZ-REEL7, the LTC2640ITS8-HZ8#TRMPBF uniquely combines H-grade temperature range, hardware CLR, zero-scale power-on reset, and integrated 4.096V reference in TSOT-23-8 - making it optimal for automotive and industrial systems demanding deterministic startup and minimal external components.

Availability

LTC2640ITS8-HZ8#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor conditioning, optical transceiver bias control, and automotive cabin climate actuation requiring stable component supply across extended temperature and long production lifecycles.

Supply support for LTC2640ITS8-HZ8#TRMPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2640 product line delivers compact, high-accuracy voltage-output DACs with integrated references for space- and power-constrained embedded systems requiring guaranteed monotonicity and robust startup behavior.

FAQ

What is the full-scale output voltage of the LTC2640ITS8-HZ8#TRMPBF in internal reference mode?

The LTC2640ITS8-HZ8#TRMPBF provides a 4.096V full-scale output voltage when operating in internal reference mode, derived from its integrated precision reference. This value is specified across the full –40°C to 125°C temperature range with ±10ppm/°C drift, enabling direct interfacing with 12-bit ADCs and eliminating external reference components in 5V systems.

Does the LTC2640ITS8-HZ8#TRMPBF support external reference operation?

Yes, the LTC2640ITS8-HZ8#TRMPBF supports external reference operation via the REF pin (Pin 6), accepting input voltages from 0V to VCC. When an external reference is applied, the DAC's full-scale output becomes equal to that reference voltage. The device automatically detects and switches modes based on configuration - no software command is required to select external reference mode.

What is the maximum SPI clock frequency supported by the LTC2640ITS8-HZ8#TRMPBF?

The LTC2640ITS8-HZ8#TRMPBF supports SPI clock frequencies up to 50MHz, as confirmed in its timing specifications. This allows high-speed loading of DAC codes in real-time control applications. All timing parameters - including setup/hold times (t1/t2 ≥ 4ns), SCK high/low times (t3/t4 ≥ 9ns), and CS/LD pulse width (t5 ≥ 10ns) - are guaranteed across the full operating temperature range of –40°C to 125°C.

How does the power-on reset behavior of the LTC2640ITS8-HZ8#TRMPBF differ from mid-scale reset variants?

The LTC2640ITS8-HZ8#TRMPBF resets to zero-scale at power-up, unlike HM variants which reset to mid-scale. This deterministic zero output prevents unintended actuation in safety-critical paths (e.g., laser diode bias, motor enable). The power-on glitch is limited to <5mV when VCC ramps to 5V in ≥1ms, verified in Typical Performance Characteristics Figure G28.

Is the LTC2640ITS8-HZ8#TRMPBF pin-compatible with other members of the LTC2640 family?

Yes, all LTC2640 variants - including LTC2640ITS8-HZ8#TRMPBF - share identical 8-lead TSOT-23 pinout and electrical interface. Pin functions (CS/LD, SCK, SDI, GND, VCC, REF, VOUT, CLR) are consistent across resolutions (8/10/12-bit), reference voltages (2.5V/4.096V), and reset options (zero/mid-scale), enabling drop-in replacement during design iteration or qualification.