Analog Devices Inc. LTC1606ACSW#PBF

Overview

LTC1606ACSW#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive-approximation analog-to-digital converter (SAR ADC) operating from a single 5V supply. It features ±10V bipolar input range, ±2.0LSB max integral nonlinearity, 90dB typical signal-to-noise ratio, and integrated 2.5V reference with 4.096V buffered CAP output - deployed in high-accuracy industrial data acquisition systems requiring stable DC performance and low transition noise (0.65LSB RMS).

For engineers reviewing the LTC1606ACSW#PBF datasheet, LTC1606ACSW#PBF pinout, LTC1606ACSW#PBF application, or LTC1606ACSW#PBF equivalent, key selection considerations include its 28-pin SO package compatibility, microprocessor-parallel interface timing (2.5µs conversion time, BUSY-driven handshaking), internal clock synchronization, and support for both internal and external reference configurations across 0°C to 70°C ambient operation.

Technical Context

The LTC1606ACSW#PBF implements a switched-capacitor SAR architecture with auto-zeroed comparator and precision 16-bit capacitive DAC, enabling guaranteed no-missing-codes performance over temperature. Its sample-and-hold circuit achieves 1.5µs acquisition time and 2.5µs total conversion time, synchronized by an internally trimmed clock - eliminating external timing components.

DC accuracy is maintained via factory-trimmed 2.5V bandgap reference (±5ppm/°C tempco) and curvature correction, supporting ±10V full-scale input (±4 × VREF). Dynamic performance includes 90dB SINAD at 1kHz, –102dB THD, and 275kHz full-power bandwidth - optimized for precision digitization of sensor, process control, and DSP front-end signals.

Key Specifications

Pinout & Package

Package: 28-lead plastic SO (wide, 0.300-inch body width), RoHS-compliant lead-free finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS7805U and AD976AARZ, the LTC1606ACSW#PBF delivers 2.5× higher throughput, integrated clock and reference, and deterministic BUSY signaling - reducing firmware overhead and PCB area while maintaining 16-bit monotonicity across industrial temperature range.

Availability

LTC1606ACSW#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and high-speed PC-based DAQ requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1606ACSW#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC1606ACSW#PBF belongs to Linear's precision SAR ADC product line, engineered for industrial and instrumentation applications demanding high DC accuracy, low noise, and robust operation in electrically noisy environments.

FAQ

What is the operating temperature range for the LTC1606ACSW#PBF?

The LTC1606ACSW#PBF is specified for 0°C to 70°C ambient operation (industrial grade). This range covers standard factory automation, test equipment, and commercial data acquisition environments. Its ±2.0LSB INL and 90dB SNR are guaranteed across this full range, unlike extended-grade variants (e.g., LTC1606AI) rated for –40°C to 85°C.

Does the LTC1606ACSW#PBF require an external clock source?

No, the LTC1606ACSW#PBF includes an internally trimmed clock that delivers consistent 250ksps sampling without external timing components. This simplifies design, reduces bill-of-materials cost, and eliminates clock jitter concerns associated with external crystal oscillators or PLLs - a key advantage over alternatives like AD976A.

How does the BYTE pin affect data output formatting on the LTC1606ACSW#PBF?

The BYTE pin on the LTC1606ACSW#PBF controls 16-bit word alignment: when LOW, D15–D8 output MSBs and D7–D0 output LSBs; when HIGH, D15–D8 output LSBs and D7–D0 output MSBs. This flexibility allows seamless interfacing with both big-endian and little-endian microprocessors without external bit-reordering logic.

Can the LTC1606ACSW#PBF operate with an external reference, and what voltage range is supported?

Yes, the LTC1606ACSW#PBF supports external reference voltages from 2.30V to 2.70V applied to the REF pin. Using a higher-precision external reference (e.g., LT1461) improves full-scale accuracy and temperature drift beyond the internal 2.5V ±5ppm/°C spec - critical for metrology-grade applications where absolute accuracy exceeds ±0.25%.

What decoupling is required for optimal performance of the LTC1606ACSW#PBF?

Optimal performance requires: (1) 0.1µF ceramic + 10µF tantalum on VANA/VDD; (2) 2.2µF tantalum on REF; (3) 10µF tantalum on CAP; (4) 1000pF NPO capacitor at VIN. All capacitors must be placed within 5mm of respective pins. Separating analog/digital ground planes and routing AGND traces under the device - as documented in the LTC1606 datasheet - is mandatory to achieve 90dB SNR and ±2.0LSB INL.