Analog Devices Inc. LTC2436-1IGN#PBF

Overview

LTC2436-1IGN#PBF from Analog Devices (formerly Linear Technology) is a 2-channel differential input, micropower 16-bit No Latency ΔΣ analog-to-digital converter with integrated oscillator and 3-wire SPI/MICROWIRE interface. It delivers 0.12LSB INL, 800nV RMS noise independent of VREF, and >87dB 50Hz/60Hz notch rejection. It operates from 2.7V to 5.5V and supports ratiometric measurements with VREF from 0.1V to VCC - ideal for precision weight scales and strain-gage transducers.

For engineers reviewing the LTC2436-1IGN#PBF datasheet, LTC2436-1IGN#PBF pinout, LTC2436-1IGN#PBF application, or LTC2436-1IGN#PBF equivalent, key selection criteria include its single-cycle digital filter settling, automatic ping-pong channel switching, DC common-mode rejection >140dB, and flexible internal/external clock configuration via FO pin.

Technical Context

The LTC2436-1IGN#PBF employs a third-order delta-sigma modulator with decimating FIR filter and auto-calibrating architecture that performs offset and full-scale calibration every conversion cycle. Its internal oscillator eliminates external timing components and enables simultaneous 50Hz/60Hz ±2% rejection when FO = GND.

It uses a ping-pong multiplexer to alternate between CH0 and CH1 differential inputs, embedding channel identification in the 19-bit serial output (Bits 18–17). The 3-wire interface operates in either internal SCK mode (SCK as output) or external SCK mode (SCK as input), selected automatically at power-up or CS edge without register programming.

Key Specifications

Pinout & Package

Narrow SSOP-16 package (GN) with five ground pins (Pins 8, 9, 10, 15, 16) for optimal noise immunity and decoupling. Pin 1 = VCC, Pin 2 = REF+, Pin 3 = REF−, Pins 4–7 = CH0+/CH0−/CH1+/CH1−, Pin 11 = CS (active-low), Pin 12 = SDO (3-state), Pin 13 = SCK (bidirectional), Pin 14 = FO (frequency control).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1115IDGSR, LTC2436-1IGN#PBF provides autonomous 50/60Hz rejection and lower noise floor without MCU overhead; compared with LTC2412CGN#PBF, it trades resolution for speed, lower power, and identical footprint - making it optimal for portable industrial sensors.

Availability

LTC2436-1IGN#PBF is available at Aetrix Electronics and suitable for precision weight scales, strain-gage transducers, and direct temperature measurement systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2436-1IGN#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 LTC2436-1IGN#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in harsh electrical environments - emphasizing ease of use, self-calibration, and robust line-frequency rejection.

FAQ

What is the function of the FO pin on the LTC2436-1IGN#PBF?

The FO (Frequency Control) pin on the LTC2436-1IGN#PBF selects the conversion clock source: when tied to GND, it enables the internal oscillator for simultaneous 50Hz/60Hz ±2% rejection; when driven by an external clock (2.56–2000kHz), it configures the digital filter for custom notch frequency at fEOSC/2560 ±4%. This dual-mode capability makes LTC2436-1IGN#PBF adaptable to global mains frequencies and specialized EMI environments without hardware changes.

How does the LTC2436-1IGN#PBF achieve "no latency" in its delta-sigma architecture?

The LTC2436-1IGN#PBF achieves no latency by using a decimating FIR filter that settles fully within a single conversion cycle - unlike conventional delta-sigma ADCs requiring multiple cycles to stabilize. Each 19-bit output frame corresponds exactly to the most recent completed conversion, with no pipeline delay or redundant samples. This one-to-one mapping ensures real-time responsiveness in LTC2436-1IGN#PBF-based systems such as fast-cycling weigh scales or dynamic sensor monitoring.

Can the LTC2436-1IGN#PBF operate with a 0.1V reference voltage, and what is the impact on effective resolution?

Yes, the LTC2436-1IGN#PBF accepts VREF as low as 0.1V (differential), and doing so improves effective resolution: at 0.1V VREF, quantization step = 1.5µV/LSB, while RMS noise remains constant at 800nV - yielding ~18.7 effective bits. This is confirmed in the datasheet's Effective Resolution vs VREF plot (Figure 2). Lower VREF enhances sensitivity for microvolt-level signals without increasing noise, making LTC2436-1IGN#PBF especially valuable in low-output sensor applications.

What is the purpose of the five GND pins on the LTC2436-1IGN#PBF SSOP-16 package?

The five GND pins (Pins 8, 9, 10, 15, 16) on the LTC2436-1IGN#PBF provide low-impedance, distributed ground return paths to minimize ground bounce, improve PSRR, and enhance common-mode rejection. They support separate analog/digital ground current routing internally and reduce noise coupling between reference, input, and digital sections - critical for achieving >140dB DC CMRR and 800nV RMS noise performance in real-world PCB layouts.

Does the LTC2436-1IGN#PBF require external calibration components or software routines?

No, the LTC2436-1IGN#PBF performs automatic offset and full-scale calibration every conversion cycle without user intervention. This transparent autocalibration corrects for temperature drift, supply variation, and time-dependent errors - delivering guaranteed 0.006LSB offset error and 0.16LSB full-scale error over temperature. As a result, LTC2436-1IGN#PBF eliminates the need for external trim pots, calibration DACs, or firmware compensation tables in production systems.