Analog Devices Inc. LTC1420IGN#TRPBF

Overview

LTC1420IGN#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 10 Msps sampling ADC with integrated sample-and-hold, programmable gain amplifier (1×/2×), and internal 4.096 V reference. It operates from single 5 V or dual ±5 V supplies, delivers 71 dB S/(N+D) and 83 dB SFDR at 5 MHz input, and targets high-speed data acquisition in telecom and DSP systems.

For engineers reviewing the LTC1420IGN#TRPBF datasheet, LTC1420IGN#TRPBF pinout, LTC1420IGN#TRPBF application, or LTC1420IGN#TRPBF equivalent, key selection criteria include its differential input architecture with 75 dB CMRR, flexible ±2.048 V / ±1.024 V / ±0.512 V bipolar ranges, 100 MHz full-power bandwidth, and separate OVDD logic supply supporting 3 V–5 V interfacing.

Technical Context

The LTC1420IGN#TRPBF employs a pipelined 12-bit CMOS ADC architecture with a unique differential-input sample-and-hold stage capable of acquiring signals up to 100 MHz. Its input PGA provides digitally selectable 1× or 2× gain, and the analog core accepts true differential inputs with arbitrary common-mode voltage-enabled by the dedicated VCM (2.5 V) output and SENSE-controlled reference programming.

Dynamic performance is optimized via low-aperture jitter (0.6 ps typ), fast acquisition time (10–30 ns), and precise internal references: VCM trimmed to ±25 mV over temperature and VREF stable at ±15 ppm/°C. The device features a 3-cycle pipeline latency and includes an out-of-range (OF) flag for real-time saturation detection.

Key Specifications

Pinout & Package

Package: 28-lead narrow SSOP (GN), 5.6 mm × 10.2 mm, 0.635 mm pitch, RoHS-compliant. Thermal resistance θ_JA = 80°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9220ARZ and MAX1186ETX+, the LTC1420IGN#TRPBF offers superior system integration via its on-chip PGA, dual-supply/single-supply flexibility, and higher CMRR-reducing external component count and improving noise immunity in ground-noisy environments.

Availability

LTC1420IGN#TRPBF is available at Aetrix Electronics and suitable for telecommunications infrastructure, digital signal processing hardware, and multiplexed data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for LTC1420IGN#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC1420IGN#TRPBF belongs to ADI's legacy Linear Technology high-speed precision ADC family, designed specifically for applications demanding wide bandwidth, low distortion, and integrated signal conditioning in compact form factors.

FAQ

What supply configurations does the LTC1420IGN#TRPBF support?

The LTC1420IGN#TRPBF operates from either a single 5 V supply (VSS = 0 V) or dual ±5 V supplies (VSS = –5 V). Its analog section uses VDD (pins 7 and 23) and VSS (pin 25), while digital outputs are powered independently via OVDD (pin 22), which accepts 2.7–5.25 V. This dual-supply flexibility simplifies integration into both legacy and modern mixed-voltage systems without level shifters.

How does the LTC1420IGN#TRPBF achieve its 75 dB common-mode rejection ratio (CMRR)?

The LTC1420IGN#TRPBF achieves 75 dB CMRR through a fully differential sample-and-hold architecture with matched input transistors and tightly controlled layout. This is verified over ±2.048 V input common-mode range and remains effective up to 10 MHz. The specification applies directly to the LTC1420IGN#TRPBF and is measured with –AIN and +AIN driven with identical common-mode signals and differential content.

Can the LTC1420IGN#TRPBF interface directly with 3 V logic systems?

Yes-the LTC1420IGN#TRPBF supports direct 3 V logic interfacing via its dedicated OVDD pin (pin 22), which powers the digital output drivers. When OVDD is set to 3 V, the D11–D0 outputs swing between 0 V and 3 V with rail-to-rail compatibility, eliminating need for external level translators. This capability is explicitly guaranteed in the LTC1420IGN#TRPBF datasheet across temperature and supply variations.

What is the purpose of the OF (overflow) pin on the LTC1420IGN#TRPBF?

The OF (overflow) pin on the LTC1420IGN#TRPBF is an active-high indicator that asserts when the analog input exceeds the selected full-scale range-i.e., when the digital output equals 0x7FF (011111111111) or 0x800 (100000000000). It responds within 15 ns of overrange condition onset and is intended for real-time AGC, fault logging, or input protection in closed-loop systems using the LTC1420IGN#TRPBF.

Does the LTC1420IGN#TRPBF require an external clock buffer for optimal performance?

The LTC1420IGN#TRPBF does not require an external clock buffer if the driving source meets its specified CLK input requirements: rise time <5 ns, VIH ≥ 2.4 V (single supply) or ≥3.5 V (dual supply), and VIL ≤ 0.8 V. However, for systems with slow or noisy clocks, a high-speed logic gate (e.g., 74AC04) is recommended to sharpen edges and reduce jitter-directly improving SNR, as jitter degrades LTC1420IGN#TRPBF performance per SNR = –20 log(2πf_INt_J).