Analog Devices Inc. AD9218BSTZ-RL105

Overview

AD9218BSTZ-RL105 from Analog Devices is a dual 10-bit, 105 MSPS analog-to-digital converter with on-chip track-and-hold and internal reference, designed for high-speed I/Q sampling in communications receivers and ultrasound front-ends. It delivers 57 dB SNR at 41 MHz input with 300 MHz analog bandwidth per channel, operates from a single 3.0 V supply (2.7–3.6 V), and supports 1 V_p-p or 2 V_p-p differential analog input ranges.

For engineers reviewing the AD9218BSTZ-RL105 datasheet, AD9218BSTZ-RL105 pinout, AD9218BSTZ-RL105 application, or AD9218BSTZ-RL105 equivalent, key selection considerations include its dual-channel interleaved timing capability, –75 dBc inter-channel crosstalk, user-selectable twos complement/offset binary output format, and pin compatibility with the AD9288 for 8-bit-to-10-bit migration paths.

Technical Context

The AD9218BSTZ-RL105 implements a bit-per-stage pipeline ADC architecture with switch-capacitor techniques, delivering 7 MSBs per stage plus a 3-bit flash sub-converter. Each channel features fully differential analog inputs with self-biased common-mode voltage (V_D/3) and independent reference inputs (REFINA/REFINB).

It supports dual-clock operation with configurable data alignment via S1/S2 pins, enabling synchronized or half-cycle-skewed outputs across channels. The ENCA/ENCB clock inputs are TTL/CMOS-compatible, and digital outputs drive 3.3 V or 2.5 V logic via separate V_DD supply pins, with pipeline latency fixed at 5 cycles.

Key Specifications

Pinout & Package

The AD9218BSTZ-RL105 is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch), rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9218BSTZ-RL105, AD9288BSTZ-100 offers lower cost and identical layout compatibility but sacrifices 2 bits of resolution and dynamic range, while ADS5272IPFP provides superior ENOB and integrated digital interface at the expense of increased power, complexity, and non-drop-in packaging.

Availability

AD9218BSTZ-RL105 is available at Aetrix Electronics and suitable for battery-powered instruments, handheld scopemeters, and low-cost digital oscilloscopes requiring stable component supply, long-term production continuity, and industrial-temperature-grade reliability.

Supply support for AD9218BSTZ-RL105 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision data conversion and signal conditioning solutions.

The AD9218BSTZ-RL105 belongs to Analog Devices' high-speed ADC product line, engineered specifically for direct RF sampling, communications receiver front-ends, and portable test equipment demanding low power, small footprint, and dual-channel synchronization.

FAQ

What is the maximum analog input frequency supported by the AD9218BSTZ-RL105?

The AD9218BSTZ-RL105 has a full-power analog bandwidth of 300 MHz per channel, meaning it can accurately digitize signals up to that frequency without significant amplitude roll-off. However, the maximum usable input frequency is limited by the Nyquist criterion: at its rated 105 MSPS sampling rate, signals above ~51 MHz will alias. For clean digitization, input tones should remain below half the encode rate unless undersampling techniques are intentionally applied.

Does the AD9218BSTZ-RL105 require external support components to operate?

No-AD9218BSTZ-RL105 integrates an on-chip 1.24 V reference (REFOUT) and track-and-hold circuitry, allowing full operation with only a single 3.0 V supply (2.7–3.6 V), a clean encode clock, and properly terminated analog inputs. External components are optional: precision resistors may be added to REFINA/REFINB for gain adjustment, and series termination resistors (~22 Ω) are recommended on digital outputs for impedance matching.

How does the DFS/GAIN pin affect the AD9218BSTZ-RL105's analog input range and output coding?

The DFS/GAIN pin configures both analog input range and digital output format. When grounded, AD9218BSTZ-RL105 uses offset binary coding with 1 V_p-p input range; when pulled high, it uses twos complement coding with 1 V_p-p range; when left floating, it defaults to offset binary with 2 V_p-p range; and when tied to REFOUT, it selects twos complement with 2 V_p-p range-enabling four distinct operating modes without external logic.

Can the two channels of the AD9218BSTZ-RL105 be sampled at different rates?

No-the AD9218BSTZ-RL105 does not support independent encode rates per channel. Both ENCA and ENCB inputs must be driven synchronously or with fixed phase relationships (e.g., 180° offset). The device supports either identical clock sources for simultaneous sampling or phase-shifted clocks for data alignment mode, but each channel's conversion timing is locked to its respective encode edge and cannot be decoupled in rate.

What is the power-down behavior of the AD9218BSTZ-RL105, and how quickly does it recover?

In power-down mode (S1 = S2 = 0), both AD9218BSTZ-RL105 channels disable analog circuitry and drive all digital outputs to high-impedance. Supply current drops to ≤22 mA per channel (IVD), and recovery to full operation requires exactly 10 encode clock cycles after exit command-ensuring deterministic reacquisition without calibration overhead.