Analog Devices Inc. DC1010A-C

Overview

LTC2487 from Analog Devices is a 16-bit, 4-channel (2 differential) delta-sigma ADC with integrated PGA, Easy Drive input current cancellation, I²C interface, and on-chip temperature sensor. It delivers 2 ppm INL, 600 nV RMS noise, and programmable gain (1–256) for high-accuracy sensor digitization in industrial process control and instrumentation systems.

For engineers reviewing the LTC2487 datasheet, LTC2487 pinout, LTC2487 application, or LTC2487 equivalent, this device supports rail-to-rail inputs with zero differential input current, simultaneous 50/60 Hz rejection, and direct digitization of high-impedance sensors without external amplification - critical for precision data acquisition with temperature compensation.

Technical Context

The LTC2487 employs a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration that runs every conversion cycle, eliminating offset and full-scale drift across temperature, supply, and channel selection. Its patented Easy Drive front end cancels differential input current via passive sampling, enabling direct connection to RC networks and sensors up to GND–0.3V to VCC+0.3V.

It features a configurable 2-wire I²C interface with 9 selectable addresses plus global sync, internal oscillator (307.2 kHz), and support for external clocking. Conversion modes include 1× (15.7 Hz) and 2× speed (31.4 Hz), with programmable 50 Hz, 60 Hz, or simultaneous 50/60 Hz rejection - all while maintaining no-latency output and single-cycle digital filter settling.

Key Specifications

Pinout & Package

Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND, must be soldered).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar delta-sigma ADC applications.

Compared with ADS1115IDGSR and MAX11613EEE+, the LTC2487 uniquely combines zero-differential-input-current operation, on-chip temperature sensing, and simultaneous power-line rejection in a single I²C device - reducing design complexity and component count in precision sensor interfaces.

Availability

LTC2487 is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and embedded temperature-monitored sensing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2487 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2487 belongs to Analog Devices' precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in space-constrained industrial and instrumentation applications where input integrity and thermal stability are critical.

FAQ

What is the maximum source impedance the LTC2487 can drive without accuracy degradation?

The LTC2487 uses Easy Drive technology to cancel differential input current, enabling direct connection to sensors and RC networks with source impedances up to 100 kΩ while maintaining full 2 ppm INL and 600 nV RMS noise specifications. This eliminates the need for external op-amp buffers in most precision applications, unlike conventional delta-sigma ADCs which require <1 kΩ source impedance.

Does the LTC2487 require external calibration for offset or gain over temperature?

No. The LTC2487 performs automatic offset and full-scale calibration on every conversion cycle, independent of channel selection. This continuous calibration ensures ±0.5 µV offset error and ±32 ppm full-scale error remain stable across –40°C to 85°C, eliminating the need for system-level calibration routines or lookup tables in the host microcontroller.

How does the LTC2487 achieve simultaneous 50 Hz and 60 Hz rejection?

The LTC2487's digital filter is configured to place nulls at both 50 Hz and 60 Hz in a single operating mode using an external oscillator frequency of 280 kHz ±2%. This avoids firmware switching between rejection modes and ensures consistent noise suppression in globally deployed equipment operating on either power grid standard - a feature not available in most competing 16-bit I²C ADCs.

Can the LTC2487 measure its own die temperature and use it for system compensation?

Yes. The LTC2487 integrates a high-accuracy PTAT temperature sensor with ±2°C absolute accuracy and 0.5°C resolution. Its output is accessible via the same I²C interface used for analog conversions, enabling host software to read die temperature synchronously with sensor data - supporting real-time thermal compensation of gain, offset, and linearity errors in closed-loop systems.

What is the minimum reference voltage supported by the LTC2487 for temperature measurements?

When performing on-chip temperature measurements, the LTC2487 requires a minimum reference voltage of 2 V (VREF = REF+ – REF– ≥ 2 V). This ensures adequate headroom for the internal PTAT signal (27.8–28.2 mV at 27°C) and maintains specified ±2°C absolute accuracy. For analog channel measurements, VREF may be as low as 0.1 V.