Analog Devices Inc. AD9218BSTZ-65

Overview

AD9218BSTZ-65 from Analog Devices is a dual 10-bit, 65 MSPS analog-to-digital converter with on-chip track-and-hold and internal reference, designed for high-fidelity I/Q sampling in communications receivers and portable test equipment. 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-65 datasheet, AD9218BSTZ-65 pinout, AD9218BSTZ-65 application, or AD9218BSTZ-65 equivalent, key selection considerations include its dual-channel interleaving capability, –75 dBc inter-channel crosstalk, user-selectable twos complement/offset binary output format, and compatibility with low-jitter 65 MSPS encode clocks for direct IF sampling architectures.

Technical Context

The AD9218BSTZ-65 implements a bit-per-stage pipeline ADC architecture with switch-capacitor techniques, delivering 7 MSBs per stage plus a 3-bit flash sub-ADC. Each channel features fully differential analog inputs with self-biased common-mode voltage (V_D/3) and independent reference input pins (REFINA/REFINB).

It supports two independent encode clocks (ENCA/ENCB) or a single clock with data alignment mode (S1=1, S2=1), enabling synchronized dual-channel sampling or half-cycle skew for time-interleaved applications. The 5-cycle pipeline latency and TTL/CMOS-compatible digital outputs (3.0 V tolerant, 2.5–3.6 V V_DD) allow direct interfacing to FPGAs and DSPs without level-shifting.

Key Specifications

Pinout & Package

AD9218BSTZ-65 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). The package supports standard reflow soldering and provides low-inductance ground paths via multiple GND pins (1, 12, 16, 27, 29, 32, 34, 45) and dedicated analog/digital supplies (VD: 13, 30, 31, 48; VDD: 15, 28, 33, 46).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 10-bit ADC applications.

Compared with AD9218BSTZ-80 and AD9288BSTZ-65, the AD9218BSTZ-65 uniquely balances 10-bit resolution, 65 MSPS throughput, and industrial-temperature reliability in a pin-compatible LQFP package-making it optimal for mid-tier portable test gear and communications infrastructure where SNR and power efficiency must coexist.

Availability

AD9218BSTZ-65 is available at Aetrix Electronics and suitable for battery-powered instruments, hand-held scopemeters, and low-cost digital oscilloscopes requiring stable component supply across extended production cycles and industrial temperature environments.

Supply support for AD9218BSTZ-65 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 converters and RF solutions.

The AD9218 product line was engineered for cost-sensitive, space-constrained instrumentation and communications receivers requiring dual-channel, high-speed digitization without external support components-emphasizing integration, low power, and ease of use.

FAQ

What is the maximum analog input frequency supported by the AD9218BSTZ-65?

The AD9218BSTZ-65 has a 300 MHz analog bandwidth per channel, meaning it preserves signal amplitude and phase fidelity up to 300 MHz. However, for Nyquist-compliant sampling, the maximum fundamental input frequency is 31 MHz (half of 65 MSPS). Performance metrics like SNR and SFDR are specified at 30.3 MHz (Nyquist for 65 MSPS grade), confirming usable bandwidth within that limit.

Does the AD9218BSTZ-65 require an external reference voltage?

No-the AD9218BSTZ-65 includes an internal 1.24 V reference (REFOUT) that can directly drive REFINA and REFINB pins. External references are optional and used only when higher accuracy or adjustable full-scale range is needed; the internal reference supports ±5% variation without performance degradation.

How does the DFS/GAIN pin configure input range and output format on the AD9218BSTZ-65?

On the AD9218BSTZ-65, the DFS/GAIN pin determines both analog input range and digital output coding: logic low selects offset binary output with 1 V_p-p range; logic high selects twos complement with 1 V_p-p; floating selects offset binary with 2 V_p-p; tied to VREF selects twos complement with 2 V_p-p.

Can the AD9218BSTZ-65 operate with only one channel active?

Yes-the AD9218BSTZ-65 supports independent channel power-down via S1/S2 pins. Setting S1=0, S2=1 powers down Channel B only, reducing total power consumption by ~50% while keeping Channel A fully operational with full dynamic performance.

What is the pipeline latency of the AD9218BSTZ-65, and how does it affect system timing?

The AD9218BSTZ-65 has a fixed 5-cycle pipeline delay from encode edge to valid output data. At 65 MSPS, this equals ~77 ns. This deterministic latency enables precise synchronization in real-time control loops and allows FPGA-based deskew compensation when using dual ADCs for time-interleaved sampling.