Texas Instruments ADC08D500CIYB/NOPB

Overview

ADC08D500CIYB/NOPB from Texas Instruments is a dual-channel, 8-bit, 500 MSPS CMOS analog-to-digital converter with internal sample-and-hold, single 1.9 V ±0.1 V supply operation, and LVDS digital outputs compliant with IEEE 1596.3–1996. It delivers 7.5 ENOB at 250 MHz input frequency and 500 MSPS sampling, ensures no missing codes across −40°C to +85°C, and supports interleave mode for 1 GSPS equivalent operation in direct RF down-conversion systems.

For engineers reviewing the ADC08D500CIYB/NOPB datasheet, ADC08D500CIYB/NOPB pinout, ADC08D500CIYB/NOPB application, or ADC08D500CIYB/NOPB equivalent, key selection considerations include its dual-ADC synchronization capability, fine-adjustable full-scale range (650/870 mVP-P), DDR/SDR clocking flexibility, and thermal-aware exposed-pad HLQFP package for high-speed signal acquisition in test instrumentation and communications infrastructure.

Technical Context

The ADC08D500CIYB/NOPB employs a folding-and-interpolating architecture with fully differential comparators and an innovative self-calibrating sample-and-hold amplifier, enabling flat dynamic performance beyond Nyquist. Its dual independent 8-bit ADC cores operate synchronously or interleaved, each feeding a 1:2 LVDS demultiplexer to reduce per-bus data rate to 250 MSPS in SDR mode or 500 MSPS in DDR mode.

It supports both normal and extended control modes via serial interface (SDATA/SCLK), allowing runtime adjustment of input offset (±45 mV), full-scale range (±20% FS), and calibration timing. The device integrates duty-cycle-corrected sample clock generation, OR (out-of-range) flag outputs, and dual power-down controls (PD/PDQ) for per-channel or full-device low-power operation.

Key Specifications

Pinout & Package

The ADC08D500CIYB/NOPB is housed in a 128-lead thermally enhanced exposed-pad HLQFP package (package code: CIYB). The exposed pad must be soldered to a solid ground plane to ensure thermal performance and specified electrical characteristics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC08D1000CIYB and ADS52J90IRGCT, the ADC08D500CIYB/NOPB offers optimal balance of 500 MSPS performance, parallel LVDS simplicity, industrial temperature reliability, and thermal-aware HLQFP packaging - making it ideal for legacy high-speed test equipment and RF front-end designs where pin compatibility and deterministic latency are prioritized.

Availability

ADC08D500CIYB/NOPB is available at Aetrix Electronics and suitable for direct RF down conversion, digital oscilloscopes, satellite set-top boxes, communications systems, and test instrumentation requiring stable component supply across long production lifecycles.

Supply support for ADC08D500CIYB/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance data converters for industrial, automotive, and communications markets.

The ADC08D500CIYB/NOPB belongs to TI's high-speed ADC portfolio designed specifically for wideband RF sampling, direct-conversion receivers, and real-time test equipment demanding low power, guaranteed no-missing-codes operation, and robust thermal performance.

FAQ

What is the maximum input clock frequency supported by the ADC08D500CIYB/NOPB?

The ADC08D500CIYB/NOPB supports a maximum input clock frequency of 500 MHz in both normal and interleave (DES) modes. At this rate, each channel achieves 500 MSPS sampling, and interleave mode yields an effective 1 GSPS throughput. The minimum clock frequency is 200 MHz in normal mode and 450 MHz in DES mode, as specified in the AC Electrical Characteristics table of the SNAS274F datasheet.

Does the ADC08D500CIYB/NOPB require external reference voltage or bias components?

No, the ADC08D500CIYB/NOPB integrates an internal bandgap reference (VBG = 1.20–1.33 V) and self-calibration circuitry. It only requires an external 3.3 kΩ ±0.1% resistor on the REXT pin for calibration timing. No external reference IC, trim pots, or precision resistors are needed for basic operation - simplifying layout and reducing bill-of-materials cost.

How does the interleave mode (DES) affect the ADC08D500CIYB/NOPB's dynamic performance?

In interleave mode (DES pin floating), the ADC08D500CIYB/NOPB achieves 900 MHz full-power bandwidth and maintains 7.4 ENOB at 248 MHz input, with SFDR improved to 57 dB (min). Phase matching between I/Q channels remains <1°, and crosstalk stays below −71 dB - enabling coherent wideband sampling without external alignment circuitry.

What LVDS termination is required for the ADC08D500CIYB/NOPB digital outputs?

All LVDS output pairs - including DI/DQ (non-delayed) and DId/DQd (1-cycle delayed) - must be terminated with a 100 Ω differential resistor at the receiver end. The device specifies 100 Ω differential output impedance (ZO), and proper termination ensures signal integrity, minimizes reflections, and maintains the specified 400–920 mVP-P differential swing across process/voltage/temperature corners.

Can the ADC08D500CIYB/NOPB operate with separate analog and digital supply voltages?

Yes - the ADC08D500CIYB/NOPB uses two independent supplies: VA (analog, +1.8 V to +2.0 V) and VDR (output driver, +1.8 V to VA). VA powers the core ADC and reference circuits; VDR powers the LVDS output drivers. Their difference must be ≤100 mV, and both require individual bypassing to respective ground planes (GND for VA, DR GND for VDR) as specified in the Absolute Maximum Ratings.