Analog Devices Inc. LTC1605CSW#PBF

Overview

LTC1605CSW#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 100ksps successive-approximation analog-to-digital converter with integrated sample-and-hold, 2.5V precision reference, and internal synchronized clock. It operates from a single 5V supply, delivers ±10V bipolar input range, ±2.0LSB max INL, and 87.5dB typical SINAD - used in high-accuracy industrial data acquisition systems requiring stable DC performance and low power.

For engineers reviewing the LTC1605CSW#PBF datasheet, LTC1605CSW#PBF pinout, LTC1605CSW#PBF application, or LTC1605CSW#PBF equivalent, key selection factors include guaranteed no missing codes over temperature, microprocessor-compatible 16-bit parallel interface with BUSY/CS/R/C control, ±25V input overvoltage protection, and SW-package thermal performance for embedded signal conditioning.

Technical Context

The LTC1605CSW#PBF implements a switched-capacitor SAR architecture with auto-zeroed comparator and factory-trimmed 16-bit capacitive DAC. Its internal 2.5V bandgap reference is curvature-corrected and buffered at CAP pin, supporting either internal reference operation or external 2.3–2.7V reference substitution for enhanced temperature stability.

Timing is governed by an internal trimmed clock enabling fixed 8µs conversion time and 2µs acquisition window. Control logic supports two operational modes: R/C-triggered conversion with CS held low, or CS-triggered conversion with R/C pre-asserted - both delivering data-valid timing referenced to BUSY rising edge and byte-selectable 16-bit or dual-byte output format.

Key Specifications

Pinout & Package

Package: 28-lead plastic SO Wide (SW), exposed pad grounded, JEDEC MS-013AC compliant. Thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7805UB and AD976ARZ, the LTC1605CSW#PBF provides lowest system-level integration with its internal clock, reference, and parallel interface - reducing bill-of-materials, layout complexity, and firmware development effort for new industrial DAQ designs.

Availability

LTC1605CSW#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed sensor acquisition, and PC-based high-speed data acquisition requiring stable component supply and long-term manufacturability.

Supply support for LTC1605CSW#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1605CSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for industrial and instrumentation applications demanding 16-bit accuracy, low power, and robust analog front-end integration.

FAQ

What is the operating temperature range for the LTC1605CSW#PBF?

The LTC1605CSW#PBF is rated for 0°C to 70°C ambient operating temperature. This commercial-grade specification is confirmed in the "ORDER INFORMATION" table of the datasheet, where "LTC1605CSW#PBF" is explicitly listed with "0°C to 70°C" under Temperature Range. The SW package variant shares the same thermal limits as the SSOP version, with θ_JA = 130°C/W.

Does the LTC1605CSW#PBF require an external clock source?

No, the LTC1605CSW#PBF does not require an external clock source. It contains an internal synchronized clock trimmed to deliver a typical conversion time of 8µs and guaranteed 100ksps throughput. The datasheet states "Internal Synchronized Clock" as a feature and confirms in Timing Characteristics that f_SAMPLE(MAX) = 100kHz is achieved using the internal oscillator - eliminating external timing components for basic operation.

Can the LTC1605CSW#PBF operate with an external reference voltage?

Yes, the LTC1605CSW#PBF supports external reference operation. The REF pin accepts an external 2.30V to 2.70V reference, overriding the internal 2.5V source. Datasheet section "INTERNAL REFERENCE CHARACTERISTICS" specifies this range, and Figure 3 shows the external reference connection topology. Using an external reference improves temperature drift performance when higher absolute accuracy is required beyond the ±5ppm/°C of the internal reference.

What is the meaning of the "BYTE" pin function on the LTC1605CSW#PBF?

The BYTE pin on the LTC1605CSW#PBF controls output data organization: when LOW, D15–D8 carry the most significant byte and D7–D0 the least significant byte; when HIGH, the byte order swaps so D15–D8 output the LSBs and D7–D0 output the MSBs. This is documented in the "PIN FUNCTIONS" section and Figure 10, enabling flexible interfacing with 8-bit microcontrollers or memory-mapped peripherals that expect specific byte alignment.

How is analog and digital grounding implemented on the LTC1605CSW#PBF?

The LTC1605CSW#PBF uses separate analog (AGND1, AGND2) and digital (DGND) ground pins to minimize noise coupling. Datasheet layout guidance in Application Information recommends tying AGND1 and AGND2 to a dedicated analog ground plane, DGND to a digital ground plane, and connecting both planes at a single point near the power supply ground. This separation preserves 16-bit accuracy by preventing digital switching noise from modulating the analog input path.