Analog Devices Inc. LTC1852CFW#TRPBF

Overview

LTC1852CFW#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 8-channel, 400ksps successive-approximation ADC with integrated multiplexer, internal 2.5V reference, and parallel output interface. It supports single-ended/differential inputs, unipolar/bipolar operation, dual gain ranges (1×/2×), and programmable scan sequencing - deployed in industrial data acquisition systems requiring low-power, multi-sensor sampling at ≤400ksps.

For engineers reviewing the LTC1852CFW#TRPBF datasheet, LTC1852CFW#TRPBF pinout, LTC1852CFW#TRPBF application, or LTC1852CFW#TRPBF equivalent, key selection criteria include its 10-bit resolution with ±0.25 LSB integral linearity, 2.7V–5.5V dual-supply operation (VDD/OVDD), 3mW power at 250ksps, and TSSOP-48 package compatibility with legacy LTC1850/LTC1851 designs.

Technical Context

The LTC1852CFW#TRPBF implements a capacitive SAR architecture with integrated sample-and-hold, supporting flexible analog input configuration via DIFF, UNI/BIP, PGA, and A2–A0 address pins. Its programmable sequencer stores up to 16 channel configurations (gain, polarity, differential mode) and enables automatic cycling without host software overhead.

Digital interfacing uses separate OVDD (2.7V–5.5V) for parallel outputs (D9–D0, A2OUT–A0OUT, DIFFOUT), enabling direct connection to 3V or 5V logic. Control is managed via active-low CONVST, RD, WR, CS, and SHDN, with BUSY signaling conversion status and M0/M1 selecting modes including Direct Address, Program, and Readback.

Key Specifications

Pinout & Package

Package: 48-lead plastic TSSOP (6.1mm wide), RoHS-compliant, lead-free finish, 0°C to 70°C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar data acquisition applications.

Compared with LTC1850CFW#TRPBF, the LTC1852CFW#TRPBF trades speed for lower power and identical functionality at 400ksps; versus ADS8320IPW, it delivers integrated signal conditioning and parallel throughput at the cost of resolution and interface flexibility.

Availability

LTC1852CFW#TRPBF is available at Aetrix Electronics and suitable for industrial process control, test equipment, and imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for LTC1852CFW#TRPBF 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, serving industrial, automotive, communications, and healthcare markets.

The LTC1852CFW#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, multi-channel, high-accuracy sampling in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling rate of the LTC1852CFW#TRPBF and under what conditions?

The LTC1852CFW#TRPBF achieves a maximum sampling rate of 400ksps when VDD is 5.5V. At lower supply voltages, the rate decreases - for example, to 250ksps at VDD = 2.7V. This dependency is specified in the Timing Characteristics table and reflects internal clock scaling to maintain accuracy and power efficiency across the full 2.7V–5.5V supply range. The LTC1852CFW#TRPBF must be operated within these limits to guarantee specified INL, SNR, and timing performance.

Does the LTC1852CFW#TRPBF require an external reference, or does it include an internal one?

The LTC1852CFW#TRPBF includes a fully integrated 2.5V internal reference (REFOUT) with ±15ppm/°C temperature coefficient and a programmable reference buffer that generates 2.048V or 4.096V on REFCOMP depending on REFIN configuration. An external reference may be used by tying REFIN to VDD and driving REFCOMP directly, but it is not required. The LTC1852CFW#TRPBF is fully functional with only bypass capacitors on REFOUT and REFCOMP.

How does the programmable sequencer in the LTC1852CFW#TRPBF reduce firmware overhead?

The LTC1852CFW#TRPBF's sequencer stores up to 16 independent channel configurations (address, gain, polarity, differential mode) in internal memory. Once programmed, it automatically cycles through them in scan mode without host intervention - eliminating per-sample GPIO writes and timing-critical register updates. This offloads sequencing logic from the MCU, reduces interrupt load, and improves deterministic sampling intervals. The LTC1852CFW#TRPBF supports both continuous scan and single-triggered sequence execution.

Can the LTC1852CFW#TRPBF interface directly with a 3V microcontroller, and how is this achieved?

Yes, the LTC1852CFW#TRPBF interfaces directly with 3V microcontrollers using its separate OVDD supply pin (Pin 35). Digital outputs (D9–D0, A2OUT–A0OUT, DIFFOUT) swing between OGND and OVDD, so setting OVDD = 3V ensures TTL/CMOS-compatible logic levels. Input thresholds (VIH/VIL) are specified down to 2.7V operation, and control pins (RD, WR, CONVST, CS) accept 3V logic safely. No level shifters are needed - the LTC1852CFW#TRPBF maintains full analog performance (10-bit, 400ksps) while simplifying digital interfacing.

What are the power-down modes supported by the LTC1852CFW#TRPBF, and how do they differ?

The LTC1852CFW#TRPBF supports two hardware-controlled power-down modes: Nap mode (SHDN = low, CS = low) draws 0.5mA and retains register state for fast wake-up (<200ns), while Sleep mode (SHDN = low, CS = high) draws only 20μA but requires longer wake-up time (10ms). Both modes disable the ADC core and reference buffer to minimize quiescent current. Nap mode is ideal for burst-sampling applications; Sleep mode suits infrequent wake-up scenarios like battery-powered remote sensors. The LTC1852CFW#TRPBF exits either mode on SHDN high or, in Nap mode, via CONVST edge.