Analog Devices Inc. AD9218BST-RL40

Overview

AD9218BST-RL40 from Analog Devices is a dual 10-bit, 40 MSPS analog-to-digital converter with on-chip track-and-hold and internal reference, operating from a single 3.0 V supply (2.7–3.6 V), delivering 57 dB SNR at 41 MHz input with 300 MHz analog bandwidth per channel, used in hand-held scopemeters and low-cost digital oscilloscopes.

For engineers reviewing the AD9218BST-RL40 datasheet, AD9218BST-RL40 pinout, AD9218BST-RL40 application, or AD9218BST-RL40 equivalent, key selection considerations include dual-channel sampling rate, differential analog input range (1 V_p-p or 2 V_p-p), power-down mode for single-channel operation, twos complement/offset binary output format, and pin compatibility with AD9288.

Technical Context

The AD9218BST-RL40 implements a bit-per-stage pipeline architecture with switch-capacitor techniques to deliver 10-bit resolution across two independent channels. Each channel features differential analog inputs with 300 MHz full-power bandwidth and internally biased common-mode voltage at V_D/3.

It uses TTL/CMOS-compatible encode inputs and provides latched digital outputs with five-cycle pipeline delay. User-selectable S1/S2 pins configure power-down states or data alignment-enabling synchronized dual-channel output timing or half-cycle skew between channels when driven by phase-opposed clocks.

Key Specifications

Pinout & Package

The AD9218BST-RL40 is housed in a 48-lead LQFP package (7 mm × 7 mm) 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 AD9218BST-65, the AD9218BST-RL40 trades sampling speed and input range flexibility for lower power and simpler drive requirements; versus AD9288BST-40, it delivers 2 additional bits of resolution and 12 dB higher SNR at identical clock rates-justifying upgrade where precision matters.

Availability

AD9218BST-RL40 is available at Aetrix Electronics and suitable for battery-powered instruments, hand-held scopemeters, and low-cost digital oscilloscopes requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for AD9218BST-RL40 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, communications, and instrumentation markets since 1965.

The AD9218 product line delivers dual-channel, high-speed ADCs optimized for portable test equipment and communications receivers-designed to replace multi-component signal chains with integrated, low-power, pin-compatible solutions.

FAQ

What is the maximum analog input frequency supported by the AD9218BST-RL40?

The AD9218BST-RL40 has a 300 MHz full-power analog bandwidth per channel, meaning it can accurately digitize signals up to approximately 150 MHz before significant amplitude roll-off occurs. At 41 MHz input frequency with 80 MSPS encode, it achieves 57 dB SNR-confirming usable performance well into the IF range for direct sampling architectures.

Does the AD9218BST-RL40 require an external reference voltage?

No, the AD9218BST-RL40 includes an internal 1.24 V reference (REFOUT) that can be directly connected to REFINA and REFINB pins to set full-scale range. External references are optional and only needed when tighter initial accuracy or temperature stability beyond ±40 ppm/°C is required.

How does the DFS/GAIN pin affect operation of the AD9218BST-RL40?

The DFS/GAIN pin on the AD9218BST-RL40 selects both output data format and analog input range: logic low enables offset binary with 1 V_p-p range; logic high enables twos complement with 1 V_p-p; floating enables offset binary with 2 V_p-p; tied to VREF enables twos complement with 2 V_p-p.

Can the AD9218BST-RL40 operate with independent clocks on each channel?

Yes, the AD9218BST-RL40 accepts separate encode clocks on ENCA and ENCB. With S1=1 and S2=1, the data alignment mode delays Channel B output by half a clock cycle, allowing synchronized sampling edges-even when clocks are 180° out of phase-making it ideal for I/Q demodulation.

What is the power consumption of the AD9218BST-RL40 in single-channel power-down mode?

In single-channel power-down mode (S1=0, S2=1), the AD9218BST-RL40 disables Channel B while keeping Channel A active. Total power drops to approximately 175–188 mW (DC), with V_DD current reduced to ±10 µA typical and V_D current falling to 20–22 mA-enabling dynamic power scaling in portable instruments.