Analog Devices Inc. AD9218SSTZ-105-EP

Overview

AD9218SSTZ-105-EP from Analog Devices is a dual, 10-bit, 105 MSPS analog-to-digital converter (ADC) with on-chip track-and-hold, 3.0 V single-supply operation, 300 MHz analog bandwidth per channel, and −55°C to +105°C extended industrial temperature range. It serves as a high-speed digitizer in radar front-ends where simultaneous sampling of two RF/IF signals is required.

For engineers reviewing the AD9218SSTZ-105-EP datasheet, AD9218SSTZ-105-EP pinout, AD9218SSTZ-105-EP application, or AD9218SSTZ-105-EP equivalent, key selection criteria include dual-channel timing alignment, crosstalk isolation at −75 dBc, power-down mode for single-channel operation, and TTL/CMOS-compatible digital outputs supporting 2.5 V or 3.3 V logic interfacing.

Technical Context

The AD9218SSTZ-105-EP implements two independent pipeline ADC cores sharing a common analog supply (VD) and digital supply (VDD), each with dedicated encode inputs (ENCA/ENCB), analog inputs (AINA/AINB differential pairs), and 10-bit parallel outputs (D9A–D0A, D9B–D0B). Its internal reference (REFOUT = 1.24 V typ) supports self-biased analog inputs at VD/3.

Timing control includes user-selectable S1/S2 pins to configure data alignment modes and DFS/GAIN to switch between twos complement or offset binary output formats. Aperture jitter is 3 ps rms, enabling 54 dB SNR at 51 MHz input with 105 MSPS encoding.

Key Specifications

Pinout & Package

AD9218SSTZ-105-EP is housed in a 48-lead, 7 mm × 7 mm low-profile quad flat package (LQFP, ST-48) with exposed thermal pad. Pin layout supports symmetric analog input routing and separated digital output banks for noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9218BSTZ-105 and ADS5272IPFP, the AD9218SSTZ-105-EP uniquely combines military-grade temperature range, pin-compatible drop-in replacement for legacy AD9218 designs, and verified −75 dBc crosstalk-making it irreplaceable in deployed radar and missile guidance platforms requiring long-term supply continuity and AQEC compliance.

Availability

AD9218SSTZ-105-EP is available at Aetrix Electronics and suitable for radar front-ends, avionics IF subsystems, and missile seeker electronics requiring stable component supply across extended temperature ranges and multi-decade program lifecycles.

Supply support for AD9218SSTZ-105-EP 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 precision instrumentation, communications, and defense markets since 1965.

The AD9218-EP product line delivers radiation-hardened, temperature-extended analog-to-digital converters specifically engineered for mission-critical aerospace and defense signal acquisition where reliability, longevity, and specification stability are non-negotiable.

FAQ

What is the absolute maximum analog input voltage for AD9218SSTZ-105-EP?

The absolute maximum analog input voltage for AD9218SSTZ-105-EP is –0.5 V to VD + 0.5 V, where VD is the analog supply (2.7–3.6 V). At nominal 3.0 V VD, this allows a safe input range of –0.5 V to +3.5 V differential or common-mode. Exceeding these limits risks permanent damage per Table 5 in the AD9218-EP datasheet. The device operates correctly within its specified 1 V p-p differential input range.

Does AD9218SSTZ-105-EP support independent clocking for each channel?

Yes, AD9218SSTZ-105-EP supports independent clocking via separate ENCA and ENCB inputs. When S1 = 1 and S2 = 0, Figure 3 in the datasheet confirms asynchronous operation with staggered pipeline delays. This enables flexible timing architectures such as time-interleaved sampling or asynchronous channel triggering-critical for multi-beam radar and electronic warfare receivers using the AD9218SSTZ-105-EP.

What is the pipeline latency of AD9218SSTZ-105-EP, and how does it affect system synchronization?

The AD9218SSTZ-105-EP has a fixed pipeline delay of 5 clock cycles, as specified in Table 4. This deterministic latency enables precise time-of-arrival calculations and simplifies FPGA-based digital downconversion alignment. For example, when using AD9218SSTZ-105-EP in a pulsed radar system, the 5-cycle delay allows predictable compensation in the signal processor-ensuring consistent range gate positioning across temperature and supply variations.

Can AD9218SSTZ-105-EP operate with a 2.5 V digital supply (VDD)?

Yes, AD9218SSTZ-105-EP supports VDD from 2.5 V to 3.6 V per Table 1 and Table 2. Its digital outputs remain TTL/CMOS-compatible at 2.5 V, allowing direct interfacing with 2.5 V FPGAs or ASICs without level-shifting. However, VD (analog supply) must still be 2.7–3.6 V; lowering VDD alone does not reduce total power-IVDD at 2.5 V is ~17 mA (typ), but IVD dominates total dissipation.

How is the internal reference (REFOUT) used in AD9218SSTZ-105-EP applications?

The REFOUT pin provides a buffered 1.24 V (typ) internal reference, stable over temperature (±40 ppm/°C) and load (300 µA max). In AD9218SSTZ-105-EP designs, REFOUT commonly biases external op-amps in analog front-ends or sets common-mode levels for differential drivers-eliminating need for a separate precision reference IC and improving system-level SNR consistency across the −55°C to +105°C range.