Analog Devices Inc. LTC1606CSW#PBF

Overview

LTC1606CSW#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive-approximation ADC operating from a single 5V supply. It integrates sample-and-hold, internal 2.5V reference, 4.096V buffered CAP output, and trimmed internal clock. Its ±10V bipolar input range, ±2.0LSB INL max, and 90dB SNR make it suitable for precision industrial data acquisition systems requiring high DC accuracy and low noise.

For engineers reviewing the LTC1606CSW#PBF datasheet, LTC1606CSW#PBF pinout, LTC1606CSW#PBF application, or LTC1606CSW#PBF equivalent, key selection criteria include guaranteed no missing codes over temperature, microprocessor-compatible parallel interface (16-bit or byte mode), BUSY-driven timing control, and dual ground separation (AGND1/AGND2/DGND) for mixed-signal integrity.

Technical Context

The LTC1606CSW#PBF employs a switched-capacitor SAR architecture with auto-zeroed comparator and 16-bit capacitive DAC. Its internal clock ensures fixed 2.5µs conversion time and 1.5µs acquisition time, enabling deterministic 250ksps throughput without external timing components.

It supports both internal (2.5V REF, 4.096V CAP) and external reference operation, with full-scale range defined as ±4×VREF. The BYTE pin enables flexible 16-bit or two-byte parallel readout, while CS and R/C jointly manage conversion initiation and data enable timing per Figure 8 and Figure 9 timing diagrams.

Key Specifications

Pinout & Package

Package: 28-lead plastic SO (wide, 0.300") - RoHS-compliant, surface-mount, JEDEC MS-013AC compliant, θJA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7805U and AD976ARZ, the LTC1606CSW#PBF provides higher sampling rate (250ksps vs. 100ksps), superior SNR (90dB vs. ≤87dB), and integrated CAP buffer-reducing external component count and improving reference stability in multi-ADC systems.

Availability

LTC1606CSW#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 LTC1606CSW#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 LTC1606CSW#PBF belongs to Linear Technology's precision data acquisition product line, designed specifically for industrial, test & measurement, and instrumentation applications demanding high DC accuracy, low noise, and robust mixed-signal integration.

FAQ

What is the operating temperature range for the LTC1606CSW#PBF?

The LTC1606CSW#PBF is specified for the industrial temperature range of –40°C to +85°C. This is confirmed by the "I" grade suffix in the full part number family (e.g., LTC1606ISW), and the datasheet explicitly lists LTC1606I/LTC1606AI operating range as –40°C to 85°C. All DC specifications-including ±2.0LSB INL and guaranteed no missing codes-are maintained across this full range.

Does the LTC1606CSW#PBF require an external clock to operate?

No, the LTC1606CSW#PBF does not require an external clock. It contains a fully integrated, factory-trimmed internal clock that delivers a typical conversion time of 2.5µs and ensures reliable 250ksps sampling without any external timing components. The internal clock is synchronized to the conversion cycle and eliminates timing jitter associated with external clock distribution.

How is the 4.096V CAP output used in the LTC1606CSW#PBF?

The CAP pin on the LTC1606CSW#PBF provides a buffered 4.096V output (1.64× the internal 2.5V REF), which drives the internal 16-bit capacitive DAC. It is available externally for use as a stable reference for external circuitry-such as auxiliary DACs or precision comparators-but is rated for <2mA DC load. Driving AC loads is not recommended, as it degrades converter performance.

Can the LTC1606CSW#PBF interface directly with an 8-bit microcontroller bus?

Yes, the LTC1606CSW#PBF supports byte-mode operation via the BYTE pin. When BYTE is high, the upper and lower 8-bit bytes are swapped on the D15–D0 pins, allowing sequential reading of D7–D0 (LSB byte) followed by D15–D8 (MSB byte) using standard 8-bit data bus timing. This eliminates the need for external latches or data-width converters in legacy 8-bit system designs.

What are the absolute maximum ratings for analog input voltage on the LTC1606CSW#PBF?

The absolute maximum analog input voltage rating for VIN on the LTC1606CSW#PBF is ±25V, as stated in the Absolute Maximum Ratings table. This overvoltage tolerance applies even when the device is unpowered, thanks to internal clamping diodes. However, continuous operation above the specified ±10V full-scale range will result in code saturation and is not intended for normal use.