Analog Devices

AD7621ASTZ - 16-Bit 3 MSPS SAR ADC | Analog Devices

Name: AD7621ASTZ
Brand: Analog Devices
Price: 15.9 USD
Availability: InStock

MPN: AD7621ASTZ ✓ Active

In Stock Ships in 1-3 business days

2.37 V to 2.63 V Vdss 48-LQFP (7x7 mm) Package

From $15.9 USD / Unit

MOQ: 1 |

Price updated: 2026-08-21

Volume Pricing

Qty	Unit Price	Extended
1	$24.5	$24.50
10	$22.1	$221.00
100	$19.8	$1,980.00
500	$17.5	$8,750.00
1,000	$15.9	$15,900.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for AD7621ASTZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

AD7621ASTZRL

✅ Drop-In

📦 48-LQFP (7x7 mm)

Same device, tape-and-reel packaging

📋 Reference alternative (not in catalog)

AD7621AST

✅ Drop-In

📦 48-LQFP (7x7 mm)

Same package, no Z suffix (lead-free)

📋 Reference alternative (not in catalog)

ℹ️ 3 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

AD7621ASTZ Maximum Ratings & Electrical Characteristics

Resolution	16 bits
Sampling Rate	3 MSPS
Number of Inputs	1
Input Type	Fully Differential
Data Interface	Serial, Parallel
Architecture	SAR
Reference Type	External, Internal
Analog Supply Voltage	2.37 V to 2.63 V
Digital Supply Voltage	2.37 V to 2.63 V
INL (Integral Nonlinearity)	2 LSB
Package	48-LQFP (7x7 mm)
Operating Temperature Range	-40°C to +85°C
Mounting Type	Surface Mount
RoHS Status	Compliant
REACH Status	Compliant

AD7621ASTZ Pin Configuration

Pin 1	AVDD — Analog power supply
Pin 2	IN+ — Positive analog input
Pin 3	IN- — Negative analog input
Pin 4	REF — Reference voltage input
Pin 5	REFGND — Reference ground
Pin 6	AGND — Analog ground
Pin 7	DVDD — Digital power supply
Pin 8	DGND — Digital ground
Pin 9	SDO — Serial data output
Pin 10	SCLK — Serial clock input
Pin 11	CS — Chip select
Pin 12	BUSY — Busy output

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

AD7621ASTZ is suitable for 6 applications: Medical Imaging, High-Speed Data Acquisition, Industrial Process Control, Instrumentation, Vibration Analysis, Portable Instrumentation.

💊

Medical Imaging

The AD7621ASTZ's 16-bit resolution and 3 MSPS sampling rate enable high-quality digital X-ray and ultrasound imaging. Its low noise and high linearity ensure accurate image reconstruction, while the small LQFP package allows compact system design. The fully differential input rejects common-mode interference, improving signal integrity in medical environments.

Recommended

🔧

High-Speed Data Acquisition

With 3 MSPS throughput and 16-bit accuracy, the AD7621ASTZ is ideal for high-speed data acquisition systems in test and measurement equipment. It captures fast transient signals with high fidelity, and its serial interface simplifies connection to DSPs and FPGAs. The internal conversion clock reduces external timing complexity, enabling faster system integration.

Recommended

AD7980BRMZ · Analog Devices AD7606BSTZ-4 · Analog Devices

🏭

Industrial Process Control

The AD7621ASTZ provides precise analog-to-digital conversion for industrial process control loops, such as motor control and temperature monitoring. Its wide operating temperature range (-40°C to +85°C) ensures reliable operation in harsh factory environments. The device's high INL performance (2 LSB) guarantees accurate measurement of process variables, improving system efficiency and safety.

Recommended

AD7606BSTZ-6RL · Analog Devices AD7124-4BRUZ · Analog Devices

🔧

Instrumentation

In precision instrumentation, the AD7621ASTZ offers the speed and accuracy needed for spectrum analyzers, oscilloscopes, and data loggers. Its 16-bit resolution and 3 MSPS sampling rate allow capturing high-frequency signals with fine detail. The fully differential input reduces noise pickup, making it suitable for sensitive measurements in laboratory equipment.

Recommended

AD7610BCPZ-RL · Analog Devices AD7608BSTZ · Analog Devices

🏭

Vibration Analysis

The AD7621ASTZ is well-suited for vibration analysis in predictive maintenance systems. Its high sampling rate captures high-frequency vibration signals, while the 16-bit resolution provides fine amplitude resolution for detecting early signs of equipment failure. The low power consumption enables battery-powered wireless sensor nodes for remote monitoring.

Recommended

AD7606BSTZ-4 · Analog Devices AD7980ARMZ · Analog Devices

📱

Portable Instrumentation

The AD7621ASTZ's low power consumption (45 mW at 3 MSPS) and small package make it ideal for portable instrumentation such as handheld multimeters and portable data loggers. Its power-down mode reduces consumption to less than 1 mW, extending battery life. The serial interface minimizes pin count, simplifying PCB design for compact devices.

Recommended

AD7980BRMZRL7 · Analog Devices AD7091R-2BRUZ · Analog Devices

Recommended Products Summary

What is the resolution and sampling rate of AD7621ASTZ?

The AD7621ASTZ is a 16-bit ADC with a maximum sampling rate of 3 MSPS. According to the Analog Devices datasheet, it uses a charge redistribution SAR architecture and operates from a single 2.5 V supply. This combination of resolution and speed makes it suitable for high-speed data acquisition systems.

What is the input type of AD7621ASTZ?

The AD7621ASTZ has a fully differential analog input. This means it accepts a differential voltage between two input pins, which provides common-mode rejection and improves noise immunity. The input range is ±VREF, where VREF is the reference voltage.

What is the INL of AD7621ASTZ?

The integral nonlinearity (INL) of the AD7621ASTZ is 2 LSB maximum. This indicates the maximum deviation of the actual transfer function from a straight line. This level of linearity is suitable for precision measurement applications.

What is the package type of AD7621ASTZ?

The AD7621ASTZ is available in a 48-lead LQFP package with dimensions of 7x7 mm. This surface-mount package is suitable for compact PCB designs and provides good thermal performance.

What is the operating temperature range of AD7621ASTZ?

The AD7621ASTZ operates over a temperature range of -40°C to +85°C. This industrial temperature range makes it suitable for use in harsh environments, such as industrial process control and automotive applications.

What is the supply voltage range for AD7621ASTZ?

The AD7621ASTZ operates from a single 2.5 V power supply, with an allowable range of 2.37 V to 2.63 V. Both the analog and digital supplies must be within this range for proper operation.

Does AD7621ASTZ have an internal reference?

The AD7621ASTZ has an internal reference buffer, but it requires an external reference voltage source. The reference input range is 2.4 V to 2.6 V, and the device can also accept an external reference directly.

What is the power consumption of AD7621ASTZ?

The power consumption of the AD7621ASTZ is typically 45 mW at 3 MSPS. In power-down mode, the consumption drops to less than 1 mW, making it suitable for battery-powered applications.

What are the typical applications of AD7621ASTZ?

The AD7621ASTZ is used in medical imaging, high-speed data acquisition, industrial process control, and instrumentation. Its high speed and accuracy make it ideal for digital X-ray, ultrasound, and vibration analysis systems.

Is AD7621ASTZ RoHS compliant?

Yes, the AD7621ASTZ is RoHS compliant. It also meets REACH compliance requirements, as indicated in the product documentation from Analog Devices.

What is the difference between AD7621ASTZ and AD7621ACPZ?

The AD7621ASTZ is in a 48-lead LQFP package, while the AD7621ACPZ is in a 48-lead LFCSP package. Both are 16-bit, 3 MSPS SAR ADCs with similar specifications, but the package difference affects PCB layout and thermal performance.

Can AD7621ASTZ be used in battery-powered devices?

Yes, the AD7621ASTZ is suitable for battery-powered devices due to its low power consumption of 45 mW at full speed and less than 1 mW in power-down mode. Its small package also helps in compact designs.

What is the best drop-in replacement for AD7621ASTZ?

The AD7621ASTZRL is a drop-in replacement for the AD7621ASTZ, as it is the tape-and-reel version of the same device. The AD7621ACPZ is a functional equivalent but has a different package (LFCSP), so it is not a drop-in replacement.

Where can I download the AD7621ASTZ datasheet?

The AD7621ASTZ datasheet can be downloaded from the Analog Devices website at https://www.analog.com/media/en/technical-documentation/data-sheets/AD7621.pdf. It contains detailed specifications, pinout, and application information.

What is the price of AD7621ASTZ?

As of 2026-08-22, the price of AD7621ASTZ is approximately $24.50 for a single unit, with volume discounts available. For example, at 1000 units, the price drops to $15.90 per unit, according to distributor data from DigiKey and Mouser.

Engineering reference data for AD7621ASTZ — comparison, design guidance, and compliance information.

Selection Guide

Choose the AD7621ASTZ when you need a high-speed, 16-bit SAR ADC with a fully differential input and a small LQFP package. It is ideal for applications requiring 3 MSPS sampling, such as medical imaging, high-speed data acquisition, and vibration analysis. If you need a tape-and-reel option for automated assembly, select the AD7621ASTZRL. If you prefer a different package (LFCSP) with similar performance, consider the AD7621ACPZ, but note that it is not pin-compatible with the LQFP version. For lower power or lower speed applications, alternatives like the AD7980BRMZ (1 MSPS) or AD7091R-2BRUZ (12-bit) may be more suitable. Always verify pin compatibility and electrical specifications before substitution.

Comparison with Alternatives

Parameter	This Product	AD7621ASTZRL	AD7621ACPZ	AD7621AST
Package	48-LQFP (7x7 mm)	48-LQFP (7x7 mm) - same	48-LFCSP (7x7 mm) - different	48-LQFP (7x7 mm) - same
Brand	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Resolution	16 bits	16 bits	16 bits	16 bits
Sampling Rate	3 MSPS	3 MSPS	3 MSPS	3 MSPS
Input Type	Fully Differential	Fully Differential	Fully Differential	Fully Differential
INL	2 LSB	2 LSB	2 LSB	2 LSB
Supply Voltage	2.5 V (2.37-2.63 V)	2.5 V (2.37-2.63 V)	2.5 V (2.37-2.63 V)	2.5 V (2.37-2.63 V)
Operating Temperature	-40°C to +85°C	-40°C to +85°C	-40°C to +85°C	-40°C to +85°C

Key Differentiators

High speed with 16-bit resolution (vs AD7980BRMZ)
Fully differential input (vs AD7091R-2BRUZ)
Lower power consumption (vs AD7606BSTZ)

Design Notes

Provide a clean, low-noise 2.5 V supply for AVDD and DVDD. Use a low-dropout regulator (LDO) with output noise below 10 µVrms to avoid degrading ADC performance. Decouple each supply pin with a 10 µF ceramic capacitor and a 0.1 µF capacitor placed as close to the pin as possible.

For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Route analog input traces away from digital signals to minimize coupling. Place the reference decoupling capacitor (10 µF) close to the REF pin and connect REFGND directly to the analog ground plane.

Ensure the analog input source impedance is low (below 100 Ω) to avoid sampling errors. Use a driver amplifier with sufficient bandwidth and low output impedance. Avoid exceeding the absolute maximum ratings on the input pins, and ensure the reference voltage is stable and within the specified range (2.4 V to 2.6 V).