Analog Devices Inc. LTC1415IG#TRPBF

Overview

LTC1415IG#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.25 Msps successive-approximation ADC with true differential inputs, ±0.35 LSB INL, 72 dB S/(N+D) at 100 kHz, and single 5 V supply operation. It integrates a precision 2.5 V reference, internal clock, and sample-and-hold with 18 MHz full-power bandwidth - used in high-speed imaging and DSP data acquisition systems.

For engineers reviewing the LTC1415IG#TRPBF datasheet, LTC1415IG#TRPBF pinout, LTC1415IG#TRPBF application, or LTC1415IG#TRPBF equivalent, key selection criteria include its 1.25 Msps throughput with no pipeline delay, differential input common-mode rejection up to 60 dB, 3 V/5 V output logic compatibility via OVDD, and dual power-down modes (Nap: 7.5 mW, Sleep: 0.01 mW).

Technical Context

The LTC1415IG#TRPBF employs a capacitive DAC-based successive approximation architecture with a fully differential sample-and-hold front-end. Its 12-bit SAR core delivers monotonic conversion without missing codes and supports external or internal reference operation via VREF (2.500 V ±20 mV) and REFCOMP pins.

Timing is controlled by asynchronous CONVST (active-low start), BUSY (open-drain status), CS, and RD signals. The device features separate analog (AVDD/AGND), digital (DVDD/DGND), and output buffer (OVDD/OGND) supplies to minimize noise coupling - critical for maintaining 72 dB SINAD at 100 kHz while rejecting power supply feedthrough beyond –70 dB.

Key Specifications

Pinout & Package

Package: 28-pin SSOP (Plastic Small Outline Package), 0.300-inch body width, JEDEC MO-153 compliant. Thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.

Compared with ADS7822U and MAX1166BCPP+, the LTC1415IG#TRPBF provides 6.25× higher throughput, integrated differential sampling, and dual low-power states - making it uniquely suitable for real-time imaging and high-fidelity DSP where latency, noise, and power trade-offs are tightly coupled.

Availability

LTC1415IG#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, imaging systems, and digital signal processing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1415IG#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 LTC1415IG#TRPBF belongs to ADI's legacy Linear Technology precision data converter product line, designed specifically for applications demanding high AC performance, low power, and robust analog interface in space-constrained systems.

FAQ

What is the operating temperature range for the LTC1415IG#TRPBF?

The LTC1415IG#TRPBF is specified for industrial temperature operation from –40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The 'I' grade suffix explicitly denotes this extended range, distinguishing it from the commercial-grade 'C' version (0°C to 70°C). Thermal derating is not required within this range when mounted per JEDEC standards with appropriate PCB copper area.

Does the LTC1415IG#TRPBF require an external clock source?

No, the LTC1415IG#TRPBF does not require an external clock source. It contains a trimmed internal oscillator that enables full 1.25 Msps operation with no external timing components. The internal clock is factory-calibrated and supports the specified AC performance across temperature. External clocking is not supported - timing is strictly controlled by the CONVST input edge and internal SAR sequencing.

Can the LTC1415IG#TRPBF operate with a 3.3 V digital supply?

Yes, the LTC1415IG#TRPBF supports 3.3 V digital logic through the OVDD pin (Pin 26), which powers the D11–D0 output buffers independently. DVDD and AVDD must remain at 5 V (4.75–5.25 V), but OVDD may be set to 3.3 V to drive 3.3 V microcontrollers or FPGAs directly. This is explicitly permitted in the Digital Inputs and Outputs section and verified in the VOH/VOL specifications under 3.3 V conditions.

How does the differential input structure of the LTC1415IG#TRPBF improve noise immunity?

The LTC1415IG#TRPBF achieves 60 dB common-mode rejection ratio (CMRR) from DC to 1 MHz by using a fully differential sample-and-hold circuit. This rejects noise coupled equally onto +AIN and –AIN - such as ground loops, EMI, or supply ripple - while preserving the differential signal. Unlike pseudo-differential implementations, its true differential architecture maintains linearity (±0.35 LSB INL) across the full common-mode range (0 V to VDD), enabling accurate measurements in electrically noisy environments.

What are the power consumption differences between Nap and Sleep modes in the LTC1415IG#TRPBF?

In Nap mode (SHDN = low, NAP/SLP = high), the LTC1415IG#TRPBF draws 1.5–2.3 mA, reducing power to ~7.5–12 mW - enabling sub-millisecond wake-up. In Sleep mode (SHDN = low, NAP/SLP = low), current drops to 1 µA (0.01 mW), but wake-up requires 10 ms due to reference amplifier stabilization. These values are measured at VDD = 5 V and are specified in the Power Requirements table; both modes retain register state and do not require reinitialization.