Analog Devices Inc. LTC1605ACG#PBF

Overview

LTC1605ACG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 100ksps successive-approximation analog-to-digital converter with internal 2.5V reference, ±10V bipolar input range, and parallel 16-bit two's-complement output. It operates from a single 5V supply, draws 55mW typical power, and delivers ±2.0LSB integral nonlinearity over 0°C to 70°C - used in industrial data acquisition systems requiring high DC accuracy and low noise.

For engineers reviewing the LTC1605ACG#PBF datasheet, LTC1605ACG#PBF pinout, LTC1605ACG#PBF application, or LTC1605ACG#PBF equivalent, key selection factors include guaranteed no missing codes, internal synchronized clock, BUSY/CS/R/C timing interface compatibility with microprocessors and FIFOs, and SSOP-28 package thermal performance for embedded signal conditioning.

Technical Context

The LTC1605ACG#PBF implements a switched-capacitor SAR architecture with auto-zeroed comparator and integrated sample-and-hold. Its precision 2.5V bandgap reference is curvature-corrected and factory-trimmed, enabling ±10V full-scale range (±4 × VREF) without external components.

Control logic supports two operational modes: R/C-triggered conversion with CS held low, or CS-triggered conversion with R/C pre-asserted. Output latches provide 16-bit parallel data in either monolithic word or byte-swapped format via the BYTE pin, with BUSY indicating conversion status and data validity timing.

Key Specifications

Pinout & Package

Package: 28-lead plastic SSOP (Small Outline Package), exposed pad grounded, 0°C to 70°C operating temperature range. Thermal resistance θ_JA = 95°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 LTC1605ACG#PBF offers superior integration (internal clock + reference), lower power (55mW vs 75mW), and deterministic parallel timing - making it optimal for real-time industrial control where latency predictability and board space are critical.

Availability

LTC1605ACG#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 traceable sourcing.

Supply support for LTC1605ACG#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC1605 family was designed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, low-power, single-supply data acquisition in space- and thermal-constrained industrial environments.

FAQ

What is the operating temperature range for the LTC1605ACG#PBF?

The LTC1605ACG#PBF is rated for 0°C to 70°C ambient operation. This commercial-grade temperature range is specified in the ordering information table and applies to all electrical characteristics unless otherwise noted. The 'A' grade denotes improved DC accuracy (±2.0LSB INL) versus the standard LTC1605C grade (±3.0LSB), both sharing the same temperature range. Thermal derating is not required within this range when mounted per SSOP-28 thermal guidelines.

Does the LTC1605ACG#PBF require an external clock source?

No, the LTC1605ACG#PBF does not require an external clock source. It integrates a factory-trimmed internal clock that delivers a typical conversion time of 8µs and guarantees 100ksps sampling rate. The internal clock eliminates timing jitter from external sources and removes the need for clock distribution circuitry - a key advantage over alternatives like the ADS7805UB, which requires a precise 2.5MHz external clock.

How does the BYTE pin affect data output formatting on the LTC1605ACG#PBF?

The BYTE pin on the LTC1605ACG#PBF selects between two parallel output formats: when LOW, D15–D8 appear on pins 6–13 and D7–D0 on pins 15–22 (standard MSB-first); when HIGH, the byte order swaps so D7–D0 occupy pins 6–13 and D15–D8 occupy pins 15–22. This allows seamless interfacing with both 16-bit microprocessors and legacy 8-bit systems without external data reordering logic.

Can the LTC1605ACG#PBF operate with an external reference voltage?

Yes, the LTC1605ACG#PBF supports external reference operation. The REF pin accepts an external 2.30V to 2.70V reference, overriding the internal 2.500V bandgap. This is used when tighter temperature drift performance is needed - e.g., replacing the internal ±5ppm/°C tempco with a precision oven-controlled reference. External reference mode maintains all AC specifications including 87.5dB SINAD, provided the external source meets noise and stability requirements.

What is the purpose of the CAP pin on the LTC1605ACG#PBF?

The CAP pin on the LTC1605ACG#PBF is the output of the internal reference buffer, delivering a low-impedance 2.5V source to drive the internal capacitive DAC array. It must be bypassed with a 2.2µF tantalum capacitor per datasheet layout guidance. While CAP can supply ≤2mA DC load, driving AC loads is discouraged as it degrades SNR and THD - unlike the REF pin, CAP is not intended for external circuit biasing.