Analog Devices Inc. AD9218BSTZ-105

Overview

AD9218BSTZ-105 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-105 datasheet, AD9218BSTZ-105 pinout, AD9218BSTZ-105 application, or AD9218BSTZ-105 equivalent, key selection criteria include dual-channel interleaving capability, –75 dBc inter-channel crosstalk, power-down mode for single-channel operation, TTL/CMOS-compatible digital outputs, and pin compatibility with the AD9288 for 8-bit-to-10-bit migration paths.

Technical Context

The AD9218BSTZ-105 implements a bit-per-stage pipeline architecture with switch-capacitor techniques to achieve 10-bit resolution at 105 MSPS. Each channel features independent differential analog inputs, on-chip 1.24 V reference (REFOUT), and fully independent encode clock inputs (ENCA, ENCB) supporting synchronous or asynchronous timing modes.

User-selectable S1/S2 pins configure power-down states (both channels or Channel B only) and data alignment-enabling Channel B output skew by ½ clock cycle when two out-of-phase clocks are applied. The device uses separate analog (VD) and digital (VDD) supplies and drives TTL/CMOS loads with programmable output format (twos complement or offset binary).

Key Specifications

Pinout & Package

AD9218BSTZ-105 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 ADC applications.

Compared with AD9218BSTZ-80 and AD9288BSTZ-100, the AD9218BSTZ-105 provides highest Nyquist bandwidth (51 MHz) and best SNR (57 dB) among pin-compatible dual ADCs, while retaining on-chip reference and lowest power per MSPS in its class.

Availability

AD9218BSTZ-105 is available at Aetrix Electronics and suitable for battery-powered instruments, handheld scopemeters, and low-cost digital oscilloscopes requiring stable component supply across industrial temperature range (–40°C to +85°C) and long-term production continuity.

Supply support for AD9218BSTZ-105 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 targets high-speed data acquisition systems requiring dual-channel synchronization, low power, and integrated analog front-end functionality-specifically for communications, medical imaging, and test equipment.

FAQ

What is the maximum analog input frequency supported by the AD9218BSTZ-105?

The AD9218BSTZ-105 supports a full-power analog bandwidth of 300 MHz per channel, enabling reliable sampling of input frequencies up to its Nyquist limit of 51 MHz (half of 105 MSPS). Performance metrics like SNR and SFDR are specified up to this frequency, and the device maintains –75 dBc crosstalk even under full-scale differential drive conditions.

Does the AD9218BSTZ-105 require an external reference voltage?

No, the AD9218BSTZ-105 includes an on-chip 1.24 V reference (REFOUT) that can directly drive REFINA and REFINB pins. External references are optional for precision calibration; using the internal reference simplifies design and reduces component count without sacrificing performance-SNR remains 57 dB at 41 MHz with internal reference enabled.

How does the power-down mode operate on the AD9218BSTZ-105?

The AD9218BSTZ-105 supports two power-down configurations via S1/S2 pins: both channels or Channel B only. In power-down state, analog core current drops to 22 mA (IVD), digital supply current falls to ±10 µA (IVDD), and all digital outputs enter high-impedance state. Recovery requires exactly 10 clock cycles before valid data resumes-verified across –40°C to +85°C.

Is the AD9218BSTZ-105 pin-compatible with other members of the AD9218 family?

Yes, all AD9218 speed grades-including AD9218BSTZ-40, -65, -80, and -105-share identical 48-lead LQFP packaging, pinout, and footprint. This allows drop-in replacement across sampling rates without PCB modification, provided thermal and power delivery margins accommodate the higher 275 mW/channel dissipation of the AD9218BSTZ-105.

What digital output interface standards does the AD9218BSTZ-105 support?

The AD9218BSTZ-105 provides parallel TTL/CMOS-compatible digital outputs (D0A–D9A and D0B–D9B) with programmable output format (twos complement or offset binary via DFS/GAIN). Outputs operate from VDD = 2.5–3.6 V, enabling direct connection to FPGAs, ASICs, or microcontrollers without level-shifting-no LVDS, JESD204B, or serial interfaces are implemented.