Analog Devices Inc. LTC1605-1CG#PBF

Overview

LTC1605-1CG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 100ksps sampling analog-to-digital converter with unipolar 0V to 4V input range, internal 2.5V reference, and 28-pin SSOP package. It operates from a single 5V supply, draws 55mW typical power, delivers 86dB SNR, and interfaces via 16-bit parallel output for industrial data acquisition systems.

For engineers reviewing the LTC1605-1CG#PBF datasheet, LTC1605-1CG#PBF pinout, LTC1605-1CG#PBF application, or LTC1605-1CG#PBF equivalent, key selection criteria include unipolar input range compatibility, 100ksps throughput with <8µs conversion time, internal clock synchronization, and SSOP-28 thermal performance (θJA = 95°C/W) in 0°C to 70°C ambient.

Technical Context

The LTC1605-1CG#PBF implements a switched-capacitor successive approximation architecture with integrated sample-and-hold, precision bandgap reference, and trimmed internal clock - eliminating external timing components. Its 16-bit SAR core achieves ±3 LSB integral nonlinearity and 1 LSB transition noise over temperature.

Digital interface uses microprocessor-compatible parallel bus with CS/R/C control logic, BUSY status flag, and BYTE-selectable 16-bit or two-byte read mode. Input protection supports ±25V fault tolerance, while dual analog/digital ground pins (AGND1/AGND2/DGND) enable separation of analog and digital return paths.

Key Specifications

Pinout & Package

Package: 28-lead plastic SSOP (G-package), exposed pad soldered to PCB ground, θJA = 95°C/W, operating ambient 0°C to 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8505IPFBT and MAX1186EEE+, the LTC1605-1CG#PBF provides optimal balance of unipolar 0–4V direct interface, 86dB SNR, and self-contained operation - reducing system-level complexity in industrial DAQ where parallel bus simplicity and reference integration are prioritized over raw speed or ultra-miniaturization.

Availability

LTC1605-1CG#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 consistent parametric performance across production batches.

Supply support for LTC1605-1CG#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 LTC1605-1CG#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for industrial and instrumentation applications demanding high resolution, low power, and robust single-supply operation without external timing or reference components.

FAQ

What is the absolute maximum analog input voltage rating for the LTC1605-1CG#PBF?

The LTC1605-1CG#PBF specifies an absolute maximum analog input voltage of ±25V on the VIN pin, as defined in the Absolute Maximum Ratings table. This overvoltage tolerance applies regardless of power supply state and is enabled by internal clamping diodes. Operation within the functional 0V to 4V input range is required for specified 16-bit linearity and accuracy; the ±25V rating is strictly for fault survival, not continuous operation.

Does the LTC1605-1CG#PBF require an external clock source?

No, the LTC1605-1CG#PBF does not require an external clock source. It integrates a factory-trimmed internal clock that delivers guaranteed 100ksps sampling rate with 8µs maximum conversion time and 2µs acquisition time. The internal clock eliminates timing jitter from external sources and removes the need for external crystal oscillators or clock generators in most applications.

How is the reference voltage configured on the LTC1605-1CG#PBF?

The LTC1605-1CG#PBF features a factory-trimmed 2.5V internal bandgap reference accessible at the REF pin, with a buffered output at CAP. It operates natively with this internal reference to achieve 0V–4V full-scale input range. An external reference can be applied to REF if higher temperature stability or initial accuracy is required, overriding the internal source while maintaining full functionality of the CAP buffer.

What is the purpose of the BYTE pin on the LTC1605-1CG#PBF?

The BYTE pin on the LTC1605-1CG#PBF controls data bus organization during parallel read operations. When BYTE is low, D15–D8 output the most significant byte and D7–D0 output the least significant byte. When BYTE is high, the byte order swaps: D7–D0 output the MSB byte and D15–D8 output the LSB byte - enabling flexible interface with 8-bit microcontrollers or memory-mapped peripherals that expect LSB-first addressing.

Can the LTC1605-1CG#PBF operate with separate analog and digital ground planes?

Yes, the LTC1605-1CG#PBF is explicitly designed for split-ground layouts. It provides three dedicated ground terminals: AGND1 (reference input ground), AGND2 (reference buffer ground), and DGND (digital ground). Best practice is to tie all three to a single low-impedance analog ground plane beneath the device, with digital return currents routed separately to avoid noise coupling into sensitive analog nodes.