AD7621BCPZ - 16-Bit 3 MSPS PulSAR ADC | Analog Devices
MPN: AD7621BCPZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $23.45 | $23.45 |
| 10 | $21.1 | $211.00 |
| 100 | $18.76 | $1,876.00 |
| 500 | $16.42 | $8,210.00 |
| 1,000 | $14.08 | $14,080.00 |
AD7621BCPZ Overview
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It is known for its high speed, low power consumption, and excellent accuracy, making it ideal for applications such as medical imaging, industrial process control, and instrumentation. The AD7621 belongs to the PulSAR family of ADCs, which are recognized for their superior linearity and low noise performance.
Key features of the AD7621 include a 16-bit resolution with no missing codes, a maximum throughput of 3 MSPS, and a typical power dissipation of 65 mW. The device supports both parallel and serial output interfaces, providing flexibility in system design. The internal reference eliminates the need for an external reference, simplifying the design and reducing component count. The fully differential input allows for high common-mode rejection, improving noise immunity in noisy environments.
The AD7621 is fabricated using Analog Devices' iCMOS high-voltage process, which enables high performance and reliability. The device includes an internal conversion clock, reducing the need for external timing components. The ADC operates over a temperature range of -40°C to +85°C, making it suitable for industrial applications. The LFCSP package provides excellent thermal performance and is RoHS compliant.
Typical applications for the AD7621 include high-speed data acquisition systems, medical imaging equipment, industrial process control, and instrumentation. Its high throughput and accuracy make it ideal for applications requiring precise and fast analog-to-digital conversion. The device is also suitable for portable and battery-powered applications due to its low power consumption.
When designing with the AD7621, it is important to provide a clean, low-noise power supply and proper decoupling to achieve optimal performance. The reference input should be bypassed with a capacitor to reduce noise. The digital interface should be designed to minimize crosstalk and ensure reliable data transfer.
Drop-in alternatives for AD7621BCPZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7621BCPZ (same form factor and footprint) — differing in Input Type, Sampling Rate, Package, Resolution, Reference Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7621ACPZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7610BCPZ-RL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$27.8409 / Unit
View Datasheet →LTC2380-16
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7980BCPZ-RL7
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$18 / Unit
View Datasheet →AD7621BCPZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate | 3 MSPS |
| Architecture | SAR (charge redistribution) |
| Input Type | Fully differential |
| Supply Voltage | 2.5 V (single) |
| Power Dissipation | 65 mW (typical) |
| Internal Reference | 2.048 V |
| Reference Drift | ±7 ppm/°C (typical) |
| INL | 2 LSB (max) |
| No Missing Codes | 16-bit |
| Interface | Parallel / Serial |
| Package | 48-LFCSP-VQ (7x7 mm) |
| Operating Temperature | -40°C to +85°C |
| RoHS | Compliant |
| Mounting Type | Surface Mount |
AD7621BCPZ Pin Configuration
| Pin 1 | AVDD — Analog power supply (2.5V) |
| Pin 2 | IN+ — Positive differential input |
| Pin 3 | IN- — Negative differential input |
| Pin 4 | REF — Reference input/output |
| Pin 5 | GND — Ground |
| Pin 6 | DVDD — Digital power supply |
| Pin 7 | D0 — Parallel data output bit 0 |
| Pin 8 | D1 — Parallel data output bit 1 |
| Pin 9 | D2 — Parallel data output bit 2 |
| Pin 10 | D3 — Parallel data output bit 3 |
| Pin 11 | D4 — Parallel data output bit 4 |
| Pin 12 | D5 — Parallel data output bit 5 |
| Pin 13 | D6 — Parallel data output bit 6 |
| Pin 14 | D7 — Parallel data output bit 7 |
| Pin 15 | D8 — Parallel data output bit 8 |
| Pin 16 | D9 — Parallel data output bit 9 |
| Pin 17 | D10 — Parallel data output bit 10 |
| Pin 18 | D11 — Parallel data output bit 11 |
| Pin 19 | D12 — Parallel data output bit 12 |
| Pin 20 | D13 — Parallel data output bit 13 |
| Pin 21 | D14 — Parallel data output bit 14 |
| Pin 22 | D15 — Parallel data output bit 15 |
| Pin 23 | BUSY — Busy output |
| Pin 24 | CS — Chip select |
| Pin 25 | RD — Read input |
| Pin 26 | WR — Write input |
| Pin 27 | MODE — Interface mode select |
| Pin 28 | PD — Power-down input |
| Pin 29 | REFBUF — Reference buffer enable |
| Pin 30 | VIO — I/O supply voltage |
| Pin 31 | DGND — Digital ground |
| Pin 32 | NC — No connect |
Typical Applications
AD7621BCPZ is suitable for 6 applications: High-Speed Data Acquisition, Medical Imaging, Industrial Process Control, Instrumentation, Portable/Battery-Powered Devices, Communications.
High-Speed Data Acquisition
The AD7621BCPZ's 3 MSPS sampling rate and 16-bit resolution make it ideal for high-speed data acquisition systems. Its fully differential input and low power consumption enable accurate capture of fast-changing signals in applications such as vibration analysis and transient recording. The internal reference simplifies design, while the parallel/serial interface allows flexible integration with DSPs and FPGAs. With a typical power dissipation of 65 mW, it is suitable for multi-channel systems where power budget is critical.
Recommended
Medical Imaging
In medical imaging systems such as ultrasound and MRI, the AD7621BCPZ provides high-resolution conversion of analog signals with excellent linearity (INL of 2 LSB). Its 3 MSPS throughput supports real-time imaging, while the fully differential input rejects common-mode noise from the sensor front-end. The small LFCSP package allows compact board designs, and the low power dissipation helps manage thermal constraints in portable devices. The internal reference reduces external component count, improving reliability.
Recommended
Industrial Process Control
The AD7621BCPZ is well-suited for industrial process control, where accurate and fast analog-to-digital conversion is required for monitoring and control loops. Its 16-bit resolution and 3 MSPS sampling rate enable precise measurement of process variables such as temperature, pressure, and flow. The device operates over a wide temperature range (-40°C to +85°C) and is RoHS compliant, meeting industrial standards. The fully differential input provides immunity to electrical noise common in factory environments.
Recommended
Instrumentation
For precision instrumentation such as spectrum analyzers and digital multimeters, the AD7621BCPZ offers high accuracy and speed. Its 16-bit resolution with no missing codes ensures reliable measurements, while the 3 MSPS throughput allows fast data logging. The internal reference with low drift (±7 ppm/°C) maintains accuracy over temperature. The parallel interface enables high-speed data transfer to microprocessors, and the low power consumption is beneficial for benchtop and portable instruments.
Recommended
Portable/Battery-Powered Devices
The AD7621BCPZ's low power dissipation (65 mW) and single 2.5 V supply make it ideal for portable and battery-powered devices. Its compact LFCSP package saves board space, and the internal reference reduces external components, simplifying design. The device supports an impulse mode that further reduces power at lower sampling rates, extending battery life. Applications include handheld data loggers, portable medical monitors, and field instruments.
Recommended
Communications
In communications systems, the AD7621BCPZ can be used for digitizing IF signals in software-defined radios and base stations. Its 3 MSPS sampling rate and 16-bit resolution provide sufficient dynamic range for many communication signals. The fully differential input interfaces directly with differential amplifiers and baluns, and the low power consumption is advantageous in multi-channel receivers. The parallel/serial interface allows easy connection to FPGAs and DSPs for digital signal processing.
Recommended
Recommended Products Summary
Engineering reference data for AD7621BCPZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7621ACPZ | AD7621BSTZ | AD7610BCPZ | LTC2380-16 | AD7980BCPZ-RL7 |
|---|---|---|---|---|---|---|
| Package | 48-LFCSP-VQ (7x7 mm) | 48-LFCSP-VQ (7x7 mm) | 48-LQFP (7x7 mm) | 48-LFCSP-VQ (7x7 mm) | 48-LFCSP-VQ (7x7 mm) | 48-LFCSP-VQ (7x7 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 3 MSPS | 3 MSPS | 3 MSPS | 750 kSPS | 2 MSPS | 1 MSPS |
| Power Dissipation | 65 mW | 65 mW | 65 mW | 60 mW | 21 mW | 7 mW |
| Internal Reference | Yes (2.048V) | Yes (2.048V) | Yes (2.048V) | Yes (2.048V) | Yes (4.096V) | Yes (4.096V) |
| Interface | Parallel / Serial | Parallel / Serial | Parallel / Serial | Parallel / Serial | Serial | Serial |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
Key Differentiators
- Higher sampling rate (vs AD7610BCPZ)
- Lower power consumption (vs AD7621ACPZ)
- Internal reference with low drift (vs LTC2380-16)
Design Notes
Provide a clean, low-noise 2.5V supply for AVDD and DVDD. Use separate analog and digital grounds to minimize noise coupling. Place 0.1uF and 10uF decoupling capacitors close to the power pins. The reference pin should be bypassed with a 10uF capacitor to reduce noise.
For optimal performance, use a solid ground plane and minimize trace lengths for the analog input and reference. Keep digital signals away from analog inputs to reduce crosstalk. The LFCSP package has an exposed pad that should be soldered to the ground plane for thermal and electrical performance.
Ensure the input signal is within the specified common-mode range to avoid linearity errors. The internal reference has a typical drift of ±7 ppm/°C; for applications requiring higher accuracy, consider using an external reference. Do not exceed the absolute maximum ratings for supply voltage and input pins.
Compliance Information
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification for this part.
