AD4081 - 20-Bit 20MSPS SAR ADC | Analog Devices
MPN: AD4081 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $45 | $45.00 |
| 10 | $40.5 | $405.00 |
| 100 | $36 | $3,600.00 |
| 500 | $32.4 | $16,200.00 |
| 1,000 | $29 | $29,000.00 |
Drop-in alternatives for AD4081 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AD4080BBCZ
β Drop-Inπ Reference alternative (not in catalog)
AD4084BBCZ
β Drop-Inπ Reference alternative (not in catalog)
AD7626BCPZ
β Drop-Inπ Reference alternative (not in catalog)
AD7960BCPZ
β Drop-Inπ Reference alternative (not in catalog)
ADS4226
β Drop-Inπ Reference alternative (not in catalog)
AD4081 Maximum Ratings & Electrical Characteristics
| Resolution | 20-bit |
| Sampling Rate | 20 MSPS |
| Input Type | Differential |
| Architecture | SAR |
| SINAD | >90 dBFS at >1 MHz |
| Latency | 77.50 ns |
| Number of Inputs | 1 |
| Package | 49-CSPBGA (5x5 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| Supply Voltage | [DATA_NEEDED: supply voltage] |
| Power Dissipation | [DATA_NEEDED: power dissipation] |
| Reference Voltage | [DATA_NEEDED: reference voltage] |
| Interface | [DATA_NEEDED: interface type] |
| RoHS Status | Compliant |
AD4081 Pin Configuration
| Pin A1 | VIN+ β Positive analog input |
| Pin A2 | VIN- β Negative analog input |
| Pin A3 | REF β Reference voltage input |
| Pin B1 | AVDD β Analog power supply |
| Pin B2 | AVSS β Analog ground |
| Pin C1 | DVDD β Digital power supply |
| Pin C2 | DGND β Digital ground |
| Pin D1 | SCLK β Serial clock input |
| Pin D2 | SDI β Serial data input |
| Pin E1 | SDO β Serial data output |
| Pin E2 | CNV β Convert start input |
| Pin F1 | PD β Power-down input |
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
AD4081 is suitable for 6 applications: High-Speed Data Acquisition, Medical Imaging, Industrial Automation, Communications Infrastructure, Test and Measurement, Radar and Electronic Warfare.
High-Speed Data Acquisition
The AD4081's 20 MSPS sampling rate and 20-bit resolution enable precise digitization of wideband signals in data acquisition systems. Its Easy Drive input reduces driver complexity, allowing direct connection to sensors and amplifiers. The high SINAD (>90 dBFS) ensures accurate capture of small signal variations, making it ideal for test and measurement equipment.
Recommended
Medical Imaging
In medical imaging systems like ultrasound, the AD4081's high resolution and low noise are critical for capturing fine anatomical details. The 20-bit resolution provides a wide dynamic range, while the 20 MSPS sampling rate supports real-time imaging. The Easy Drive input minimizes artifacts, ensuring clean signal acquisition from transducer arrays.
Recommended
Industrial Automation
The AD4081 is suitable for industrial automation applications requiring high-speed, high-precision analog-to-digital conversion, such as motor control and process monitoring. Its 20-bit resolution ensures accurate measurement of sensor outputs, while the 20 MSPS sampling rate enables fast response to dynamic changes. The device's low latency (77.50 ns) supports real-time control loops.
Recommended
Communications Infrastructure
In communications systems, the AD4081's high SINAD at frequencies above 1 MHz makes it ideal for digitizing IF signals in receivers. The 20-bit resolution provides excellent spurious-free dynamic range, while the 20 MSPS sampling rate supports wideband channels. The Easy Drive input simplifies the interface to mixers and amplifiers.
Recommended
Test and Measurement
The AD4081 is well-suited for test and measurement equipment such as oscilloscopes and spectrum analyzers, where high resolution and high speed are essential. Its 20-bit resolution allows precise measurement of small signals, and the 20 MSPS sampling rate captures fast transients. The low latency ensures accurate timing in automated test systems.
Recommended
Radar and Electronic Warfare
In radar systems, the AD4081's high sampling rate and resolution enable accurate digitization of wideband radar returns. The 20-bit resolution provides a large dynamic range to handle strong and weak echoes, while the 20 MSPS sampling rate supports high-range resolution. The device's low latency is critical for real-time signal processing.
Recommended
Recommended Products Summary
Engineering reference data for AD4081 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD4080BBCZ | AD4084BBCZ | AD7626BCPZ |
|---|---|---|---|---|
| Package | 49-CSPBGA (5x5 mm) | 49-CSPBGA (5x5 mm) | 49-CSPBGA (5x5 mm) | 49-CSPBGA (5x5 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 20-bit | 20-bit | 20-bit | 16-bit |
| Sampling Rate | 20 MSPS | 10 MSPS | 20 MSPS (per channel) | 10 MSPS |
| Input Type | Differential | Differential | Differential | Differential |
| SINAD | >90 dBFS at >1 MHz | [DATA_NEEDED] | [DATA_NEEDED] | 89 dBFS at 10 MHz |
| Latency | 77.50 ns | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Number of Channels | 1 | 1 | 4 | 1 |
Key Differentiators
- 20-bit resolution at 20 MSPS (vs AD7626BCPZ)
- Easy Drive input technology (vs AD7960BCPZ)
- Low latency of 77.50 ns (vs AD4080BBCZ)
Design Notes
Ensure clean and stable power supplies for the AD4081. Use low-noise LDO regulators for AVDD and DVDD, and place decoupling capacitors (0.1 uF and 10 uF) close to the power pins. A dedicated reference voltage source with low output impedance is essential for maintaining the ADC's accuracy.
For optimal performance, route the analog input traces as a differential pair with controlled impedance. Keep the traces short and shield them from digital noise. Use a solid ground plane and avoid splitting it under the ADC. Place the reference decoupling capacitors as close to the REF pin as possible.
Avoid driving the analog inputs beyond the specified common-mode range, as this can cause distortion. Ensure the input signal settles within the acquisition time to prevent errors. Also, verify that the serial interface timing meets the datasheet requirements to avoid data corruption.
Compliance Information
RoHS compliance inferred from Analog Devices standard practice; not explicitly stated in the provided data.
