Analog Devices Inc. LTC1406IGN#PBF

Overview

LTC1406IGN#PBF from Analog Devices (formerly Linear Technology) is a low-power, 8-bit, 20Msps sampling ADC with ±1V differential input range, 250MHz sample-and-hold bandwidth, and ±1LSB INL/DNL over temperature - used in high-speed undersampling, video digitizing, and wireless baseband receivers.

For engineers reviewing the LTC1406IGN#PBF datasheet, LTC1406IGN#PBF pinout, LTC1406IGN#PBF application, or LTC1406IGN#PBF equivalent, key selection considerations include its 5-cycle pipeline latency, separate OVDD/OGND for 3V digital interfacing, 60dB CMRR up to 100MHz, power-down mode drawing 1µA, and SSOP-24 package compatibility with high-density PCB layouts.

Technical Context

The LTC1406IGN#PBF employs a 5-stage pipelined architecture with internal track-and-hold amplifiers enabling 20Msps throughput and 250MHz small-signal input bandwidth. Its differential input structure supports both true differential acquisition (±0.5V per input) and single-ended operation with AIN– tied to VREF (2.5V), maintaining rail-to-rail common-mode range (0V to VDD).

Conversion is triggered on the falling edge of CLK; output data appears five clock cycles later with 3ns aperture delay and 5psRMS jitter. The OF/UF flag provides real-time overrange/underrange detection independent of D7–D0, while separate OVDD (2.7–5.25V) and OGND allow direct interfacing with 3V logic without level shifters.

Key Specifications

Pinout & Package

Package: 24-lead narrow SSOP (GN), 0.15mm pitch, body size 7.5mm × 4.4mm, RoHS-compliant, lead-free (PbF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 8-bit ADC applications.

Compared with AD9203ARUZ and MAX1186ETL+, the LTC1406IGN#PBF uniquely balances 250MHz input bandwidth, 5V single-supply operation, and 1µA shutdown - making it optimal for compact, wideband, low-power undersampling systems where 8-bit resolution suffices.

Availability

LTC1406IGN#PBF is available at Aetrix Electronics and suitable for wireless communications infrastructure, video digitizing equipment, and high-speed data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for LTC1406IGN#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 LTC1406IGN#PBF belongs to ADI's legacy Linear Technology high-speed data converter product line, designed specifically for low-power, wideband undersampling applications in portable and space-constrained instrumentation.

FAQ

What is the operating temperature range for the LTC1406IGN#PBF?

The LTC1406IGN#PBF is specified for industrial operation from –40°C to +85°C (I-grade). All key specifications including ±1LSB INL/DNL, 47.5dB S/(N+D) at 10MHz, and 150mW power dissipation are guaranteed across this full range. The 'IGN' suffix explicitly denotes the industrial temperature grade.

Does the LTC1406IGN#PBF support single-ended input configuration?

Yes, the LTC1406IGN#PBF supports single-ended operation: tie AIN– to a fixed DC voltage (e.g., VREF = 2.5V) and drive AIN+ with a ±1V bipolar signal. The device converts the difference [(AIN+) – (AIN–)], so a 2V single-ended span centered at the common-mode voltage is maintained. Input common-mode range remains 0V to VDD.

How does the OF/UF pin function on the LTC1406IGN#PBF?

The OF/UF pin on the LTC1406IGN#PBF is an active-high overflow/underflow flag. When high with D7–D0 = 11111111, the input exceeds +1V differential; when high with D7–D0 = 00000000, the input falls below –1V differential. A low OF/UF indicates the conversion result is within the full-scale range.

Can the LTC1406IGN#PBF interface directly with 3V logic systems?

Yes, the LTC1406IGN#PBF interfaces directly with 3V logic via its dedicated OVDD (2.7–5.25V) and OGND pins. D7–D0 and OF/UF outputs swing between OVDD and OGND, while SHDN and CLK accept 3V logic thresholds (VIH = 2.4V min, VIL = 0.8V max). No level-shifting circuitry is required.

What is the minimum clock duty cycle requirement for the LTC1406IGN#PBF at 20Msps?

At the maximum 20Msps sampling rate, the LTC1406IGN#PBF requires a clock with ≤±5% deviation from 50% duty cycle (i.e., 45–55%). Each phase must be ≥25ns to ensure interstage settling; deviations beyond this degrade DNL and AC performance as shown in Figure 11 of the datasheet.