Analog Devices Inc. DC200A-L

Overview

LTC1419 from Analog Devices (acquired Linear Technology) is a 14-bit, 800ksps successive-approximation ADC with true differential inputs, internal 2.5V reference, ±2.5V bipolar input range, and no pipeline delay-designed for high-fidelity signal acquisition in spectrum analysis and telecom baseband receivers.

For engineers reviewing the LTC1419 datasheet, LTC1419 pinout, LTC1419 application, or LTC1419 equivalent, key selection criteria include its 81.5dB S/(N+D) at 100kHz, 20MHz full-power bandwidth, Nap/Sleep shutdown modes, 28-pin SO/SSOP package compatibility, and μP-compatible parallel 14-bit 2's complement output interface.

Technical Context

The LTC1419 implements a capacitor-based successive approximation register (SAR) architecture with an integrated differential sample-and-hold, enabling simultaneous sampling of +AIN and –AIN with 60dB common-mode rejection up to 100kHz. Its internal clock eliminates external timing dependencies.

Conversion is initiated by CONVST falling edge and signaled via BUSY low-active output; data becomes valid on BUSY rising edge with no latency-critical for real-time DSP interfacing. The device supports both internal 2.5V reference (±15ppm/°C tempco) and external reference operation via VREF and REFCOMP pins.

Key Specifications

Pinout & Package

Available in 28-pin plastic SO (G) and SSOP (SW) packages; both are RoHS-compliant, surface-mount, and share identical pinout. Thermal resistance θ_JA is 95°C/W (SO) and 130°C/W (SSOP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7865BSZ-1 and ADS8505IPFB, the LTC1419 uniquely delivers 14-bit resolution at 800ksps with integrated differential front-end and parallel interface-making it optimal for cost-sensitive, space-constrained high-throughput systems requiring minimal external components.

Availability

LTC1419 is available at Aetrix Electronics and suitable for telecommunications infrastructure, spectrum analysis equipment, multiplexed data acquisition systems, and imaging system digitization requiring stable component supply across extended temperature ranges.

Supply support for LTC1419 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 LTC1419 belongs to ADI's legacy Linear Technology high-speed precision ADC product line, engineered specifically for demanding signal chain applications where dynamic performance, low power, and ease of interface are critical.

FAQ

What is the maximum sampling rate supported by the LTC1419?

The LTC1419 supports a maximum sampling rate of 800ksps, with guaranteed AC performance-including 81.5dB S/(N+D) and –93dB THD-at this rate. Conversion time is specified at 950–1150ns, and the minimum inter-conversion delay is 40ns, enabling sustained full-rate operation in real-time systems.

Does the LTC1419 require an external reference, or does it have an internal one?

The LTC1419 includes a factory-trimmed, temperature-compensated 2.5V internal reference accessible at the VREF pin, eliminating the need for external reference ICs in most applications. It also supports external reference operation via the same pin, allowing flexibility for higher-accuracy or programmable input range configurations.

How does the LTC1419 handle differential versus single-ended analog inputs?

The LTC1419 features a true differential input sample-and-hold that accepts either differential signals across +AIN and –AIN or single-ended signals with –AIN grounded. Common-mode rejection remains at 60dB regardless of configuration, and the device converts the difference (+AIN – –AIN) with no degradation in linearity or noise performance.

What are the power consumption characteristics of the LTC1419 in shutdown modes?

In Nap mode (SHDN = 0V, CS = 0V), the LTC1419 draws 1.5mA total supply current and wakes up in under 400ns. In Sleep mode (SHDN = 0V, CS = 5V), it consumes only 250µA positive supply current and 1µA negative supply current-ideal for low-duty-cycle monitoring applications.

Is the LTC1419 pin-compatible with other members of the LTC14xx ADC family?

The LTC1419 shares the same 28-pin SO/SSOP footprint and core pinout (including CONVST, BUSY, RD, CS, and D[13:0]) with the LTC1418 and LTC1417, but differs in resolution and speed. It is not pin-compatible with the 12-bit LTC1416 or 16-bit LTC1415 due to differing internal reference and timing requirements.