Analog Devices Inc. AD9218BSTZ-80

Overview

AD9218BSTZ-80 from Analog Devices is a dual 10-bit, 80 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 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-80 datasheet, AD9218BSTZ-80 pinout, AD9218BSTZ-80 application, or AD9218BSTZ-80 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 80 MSPS encode clocks for direct IF sampling architectures.

Technical Context

The AD9218BSTZ-80 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 inputs (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 with ½-cycle skew. The five-cycle pipeline latency and TTL/CMOS-compatible digital outputs (D0A–D9A, D0B–D9B) operate from a separate 2.5–3.6 V V_DD supply to interface with 3.3 V or 2.5 V logic families.

Key Specifications

Pinout & Package

The AD9218BSTZ-80 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). Pin assignments are validated per Analog Devices Rev. D datasheet Figure 5 and Table 8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9218BSTZ-65 and AD9288BSTZ-100, the AD9218BSTZ-80 uniquely balances 10-bit resolution, 80 MSPS speed, integrated reference, and –75 dBc crosstalk - making it the optimal choice for I/Q demodulators and ultrasound systems requiring both fidelity and timing precision.

Availability

AD9218BSTZ-80 is available at Aetrix Electronics and suitable for ultrasound beamforming, I/Q communications receivers, low-cost digital oscilloscopes, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges.

Supply support for AD9218BSTZ-80 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD9218 product line was engineered for high-speed, dual-channel data acquisition in communications, medical imaging, and test equipment - emphasizing low power, integrated references, and pin compatibility across resolution grades.

FAQ

What is the maximum analog input frequency supported by the AD9218BSTZ-80?

The AD9218BSTZ-80 features a 300 MHz analog bandwidth per channel, meaning it preserves signal integrity up to 300 MHz. However, its maximum usable input frequency under Nyquist sampling is 39 MHz (half of 80 MSPS). For applications requiring alias-free capture, anti-alias filtering must suppress content above 39 MHz. The 300 MHz bandwidth ensures minimal amplitude/phase distortion within that band.

Does the AD9218BSTZ-80 require an external reference voltage?

No, the AD9218BSTZ-80 includes an internal 1.24 V reference (REFOUT) that can directly drive REFINA and REFINB pins. This eliminates the need for external reference ICs in most applications. External references may be used for tighter tolerance or temperature stability, but the internal reference is specified over the full industrial temperature range (–40°C to +85°C) with 40 ppm/°C drift.

How does the DFS/GAIN pin affect the AD9218BSTZ-80's operation?

The DFS/GAIN pin on the AD9218BSTZ-80 controls both digital output format and analog input range. When pulled low: offset binary output with 1 V_p-p input range. When pulled high: twos complement output with 1 V_p-p range. When floating: offset binary with 2 V_p-p range. When tied to REFOUT: twos complement with 2 V_p-p range - enabling four distinct configurations without external logic.

Can the AD9218BSTZ-80 operate with independent encode clocks on Channel A and Channel B?

Yes, the AD9218BSTZ-80 accepts independent encode clocks on ENCA and ENCB pins. With S1=1 and S2=0, each channel samples synchronously to its respective clock. When S1=1 and S2=1, the device enters data alignment mode: Channel B output is delayed by ½ clock cycle relative to Channel A, allowing both channels' data to appear aligned on the rising edge of ENCA - useful for FPGA-based DDC implementations.

What is the power-down behavior of the AD9218BSTZ-80?

In power-down mode (S1=0, S2=0), both ADC channels and associated circuitry are disabled, reducing V_D supply current to 20–22 mA. Digital outputs enter high-impedance state, and recovery to full operation requires 10 clock cycles. Channel B alone can be powered down (S1=0, S2=1) to conserve power while retaining Channel A functionality - ideal for adaptive sampling architectures.