Analog Devices Inc. LTC1414IGN#PBF

Overview

LTC1414IGN#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 2.2 Msps successive-approximation analog-to-digital converter with ±2.5 V bipolar differential input range, internal 2.5 V reference, and parallel 14-bit CMOS output. It delivers 80 dB S/(N + D) at 100 kHz and 78 dB at Nyquist (1.1 MHz), operating on ±5 V supplies with 175 mW power dissipation. It is used in high-speed data acquisition systems requiring high dynamic range and low distortion.

For engineers reviewing the LTC1414IGN#PBF datasheet, LTC1414IGN#PBF pinout, LTC1414IGN#PBF application, or LTC1414IGN#PBF equivalent, key selection considerations include its 28-pin SSOP package, no-pipeline-delay architecture, ±2.5 V input range eliminating level-shifting circuitry, 40 MHz full-power bandwidth, and microprocessor-compatible parallel interface timing.

Technical Context

The LTC1414IGN#PBF implements a capacitor-based successive approximation register (SAR) architecture with an integrated differential sample-and-hold front-end. Its 40 MHz input bandwidth supports undersampling applications, and its 70 dB common-mode rejection ratio enables robust noise rejection in mixed-signal environments.

It features an on-chip curvature-corrected bandgap reference (2.500 V ±20 mV) buffered via a 2 kΩ series resistor and compensated at REFCOMP, allowing external reference override. Conversion is initiated by a falling edge on CONVST, with BUSY indicating active conversion; output data is latched and available without pipeline latency.

Key Specifications

Pinout & Package

Package: 28-lead narrow-body SSOP (GN), 5.6 mm × 10.2 mm, 0.635 mm pitch, RoHS-compliant, lead-free (Pb-free).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with AD9240ASTZ-80 and MAX1186ETL+, the LTC1414IGN#PBF offers superior SNR efficiency per watt (80 dB @ 175 mW), integrated reference simplicity, and proven 70 dB CMRR - making it optimal for cost-sensitive, thermally constrained, high-dynamic-range acquisition where 2.2 Msps is sufficient.

Availability

LTC1414IGN#PBF is available at Aetrix Electronics and suitable for telecommunications infrastructure, digital signal processing front ends, and multiplexed data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC1414IGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC1414IGN#PBF belongs to Linear Technology's precision high-speed data converter product line, designed specifically for applications demanding high AC performance, low distortion, and simplified system integration without external references or support circuitry.

FAQ

What is the absolute maximum supply voltage rating for LTC1414IGN#PBF?

The LTC1414IGN#PBF has an absolute maximum positive supply voltage (AVDD, DVDD, OVDD) of 6 V and negative supply voltage (VSS) of –6 V. Total supply voltage (VDD to VSS) must not exceed 12 V. Exceeding these limits risks permanent damage. Recommended operating range is ±4.75 V to ±5.25 V, under which the LTC1414IGN#PBF achieves specified 175 mW power dissipation and full AC performance.

Does LTC1414IGN#PBF support external reference configuration?

Yes, the LTC1414IGN#PBF supports external reference configuration via the VREF pin (Pin 3), which features a 2 kΩ series resistor enabling overdrive. When an external 2.5 V reference is applied, full-scale error improves to ±5 LSB (vs ±10 LSB with internal reference), and full-scale tempco tightens to ±1 ppm/°C. The REFCOMP pin (Pin 4) must still be bypassed to AGND with ≥10 µF capacitance for stability.

What is the meaning of "no pipeline delay" in LTC1414IGN#PBF specifications?

"No pipeline delay" means the LTC1414IGN#PBF outputs the conversion result of the most recently completed sample immediately upon BUSY going high - there is no multi-cycle latency between sampling and data availability. Unlike pipelined ADCs, the LTC1414IGN#PBF uses a successive approximation architecture where each conversion is atomic, ensuring deterministic timing critical for real-time control loops and trigger-based acquisition.

Can LTC1414IGN#PBF accept single-ended analog inputs?

Yes, the LTC1414IGN#PBF accepts single-ended analog inputs by grounding AIN– (Pin 2) and applying the signal to AIN+ (Pin 1). Its ±2.5 V input range remains fully functional in this mode. However, common-mode noise rejection is lost, so layout and grounding must be carefully controlled. For best noise immunity, differential drive is preferred - the LTC1414IGN#PBF's 70 dB CMRR is only realized with true differential signaling.

What is the recommended bypassing scheme for LTC1414IGN#PBF power pins?

Each supply pin (AVDD, VSS, DVDD, OVDD) requires local bypassing with a 10 µF tantalum or ceramic capacitor in parallel with a 0.1 µF ceramic capacitor, placed within 5 mm of the pin and connected directly to the nearest ground plane (AGND for AVDD/VSS; DGND for DVDD; OGND for OVDD). This dual-capacitor approach suppresses both low-frequency ripple and high-frequency switching noise, maintaining the LTC1414IGN#PBF's 80 dB S/(N + D) performance.