Analog Devices Inc. LTC1415CSW#PBF

Overview

LTC1415CSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.25 Msps sampling analog-to-digital converter with ±0.35 LSB INL, 72 dB S/(N+D) at 100 kHz, and true differential inputs rejecting common-mode noise up to 60 dB - deployed in high-speed imaging systems and DSP front-ends requiring precise DC accuracy and wideband AC performance.

For engineers reviewing the LTC1415CSW#PBF datasheet, LTC1415CSW#PBF pinout, LTC1415CSW#PBF application, or LTC1415CSW#PBF equivalent, key selection criteria include its 4.096 V full-scale input range, 55 mW active power dissipation, Nap/Sleep shutdown modes, internal 2.5 V reference, and 28-pin SO Wide (SW) package compatibility with 3 V or 5 V logic interfaces.

Technical Context

The LTC1415CSW#PBF implements a successive approximation register (SAR) architecture with an integrated differential sample-and-hold circuit, enabling simultaneous acquisition on +AIN and –AIN with 18 MHz small-signal bandwidth and 150 ns acquisition time. Its internal trimmed clock and precision 2.5 V bandgap reference feed a 1.638× gain reference amplifier to generate the 4.096 V full-scale voltage.

Conversion is initiated by a falling edge on CONVST while CS is low; BUSY goes low during conversion and rises to signal data readiness. The 12-bit parallel output (D11–D0) features three-state drivers with separate OVDD supply for level-shifting, and no pipeline delay ensures deterministic timing for microprocessor and FIFO interfacing.

Key Specifications

Pinout & Package

The LTC1415CSW#PBF is housed in a 28-lead plastic SO Wide (SW) package, 10.3 mm × 7.5 mm, 1.27 mm pitch, with exposed pad not present. Thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, ~1 MSPS SAR ADC applications.

Compared with ADS7822U and MAX1166BCAP+, the LTC1415CSW#PBF provides superior AC performance (72 dB vs ≤52 dB S/(N+D)), native 5 V operation, and deterministic parallel timing - making it optimal for high-fidelity, microprocessor-coupled data acquisition where latency and SNR are critical.

Availability

LTC1415CSW#PBF is available at Aetrix Electronics and suitable for high-speed imaging systems, DSP-based telecommunications front-ends, and multiplexed industrial data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1415CSW#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 LTC1415CSW#PBF belongs to ADI's legacy Linear Technology precision data converter family, engineered for applications demanding both high DC accuracy (low INL/DNL) and wideband AC performance (high S/(N+D), low THD) in single-supply, low-power systems.

FAQ

What is the maximum sampling rate of the LTC1415CSW#PBF?

The LTC1415CSW#PBF achieves a maximum sampling rate of 1.25 Msps, confirmed in the Absolute Maximum Ratings and Timing Characteristics tables. This rate is sustained with full 12-bit accuracy, 72 dB S/(N+D), and ±0.35 LSB INL under recommended operating conditions (VDD = 4.75 V to 5.25 V, TA = 0°C to 70°C). Exceeding this rate degrades AC performance and may violate timing margins.

Does the LTC1415CSW#PBF require an external reference?

No, the LTC1415CSW#PBF includes a factory-trimmed 2.500 V internal bandgap reference accessible at Pin 3 (VREF), which feeds an on-chip reference amplifier to generate the 4.096 V full-scale voltage. External reference operation is optional - driving VREF with an LT1019-2.5 or DAC (e.g., LTC1450) allows full-scale adjustment, but the internal reference is fully functional and specified for all key AC/DC parameters.

How does the differential input structure of the LTC1415CSW#PBF improve noise immunity?

The LTC1415CSW#PBF's differential input sample-and-hold provides 60 dB common-mode rejection ratio (CMRR) from DC to 1 MHz, actively canceling noise coupled equally onto +AIN and –AIN. This eliminates ground loops and suppresses power supply ripple, EMI, and crosstalk - enabling clean digitization in electrically noisy environments without external instrumentation amplifiers, as verified in Typical Performance Characteristic TPC09.

What are the power consumption modes of the LTC1415CSW#PBF and their typical currents?

The LTC1415CSW#PBF offers three defined power states: Active mode draws 11–20 mA (55 mW at 5 V); Nap mode (SHDN = 0 V, NAP/SLP = 5 V) draws 1.5–2.3 mA; Sleep mode (SHDN = 0 V, NAP/SLP = 0 V) draws 1.0 µA. Wake-up times are 200 ns from Nap and 10 ms from Sleep, per Timing Characteristics Table, Note 12.

Can the LTC1415CSW#PBF interface directly with 3 V logic devices?

Yes, the LTC1415CSW#PBF supports direct 3 V logic interfacing via the OVDD pin (Pin 26), which powers the digital output buffers independently of DVDD and AVDD. When OVDD is tied to 3 V, the D11–D0 outputs swing rail-to-rail between 0 V and 3 V with VOH ≥ 2.4 V and VOL ≤ 0.4 V at rated loads - eliminating level shifters in mixed-voltage systems, as specified in Digital Inputs and Outputs table.