LTC1409IG
LTC1409IG - 12-Bit 800ksps Sampling ADC | Analog Devices
Analog Devices LTC1409IG is a 12-bit, 800 ksps sampling analog-to-digital converter with a parallel interface in a 28-pin SSOP package. It supports true differential input, provides a 1 µs conversion time, and operates from ±5 V supplies while dissipating 80 mW. The converter is intended for precision signal acquisition, industrial control, instrumentation, communications, and data-processing systems requiring deterministic sampling without pipeline delay.
A sampling ADC is a data-converter category that samples an analog input at a specified instant and converts it into a digital code. The LTC1409IG belongs to the successive-approximation-register family, where a sample-and-hold circuit captures the input before an internal 12-bit conversion completes. It includes a high-dynamic-range sample-and-hold stage and a precision internal reference, while also accepting an external reference when greater system-level control is required.
Key characteristics include an 800 ksps maximum sampling rate, a 1 µs conversion time, and a ±2.5 V full-scale differential input range. The converter provides single-ended or differential signal handling, digital shutdown control, and selectable operating modes. Its specified maximum DC linearity and differential nonlinearity are ±1 LSB, while signal-chain performance reaches 72.5 dB SINAD and 86 dB THD at the Nyquist frequency.
The architecture supports both internal and external reference operation. The internal reference has a stated temperature coefficient of 15 ppm/°C, providing a compact solution when a dedicated external reference would add cost or board area. Shutdown options include Nap, which reduces power dissipation to 4 mW, and Sleep, which reduces it to 10 µW, making the converter suitable for intermittently sampled acquisition systems.
Typical applications include process-control loops, multichannel measurement systems, communications receivers, industrial instrumentation, waveform capture, and precision sensor acquisition. Its parallel data bus allows the converted word to be read directly by a microcontroller, DSP, FPGA, or other digital controller, making bus timing and signal-integrity layout important considerations.
When designing a board around the LTC1409IG, preserve the specified dual-supply range and ensure adequate input settling before each conversion. Place input and reference components close to their associated pins, maintain short parallel-bus routes, and provide suitable decoupling. Confirm that the selected downstream logic voltage and acquisition timing support the converter's parallel interface and sampling requirements.
This page combines manufacturer specifications, package information, verified source links, drop-in family references, and practical design guidance to support component selection, schematic planning, PCB layout, and replacement evaluation.
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