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Analog Devices Inc. AD9251BCPZ-20
- Part No.:
- AD9251BCPZ-20
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD9251BCPZ-20.pdf
- Description:
- IC ADC 14BIT PIPELINED 64LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
AD9251BCPZ-20 from Analog Devices is a dual-channel, 14-bit, 20 MSPS analog-to-digital converter operating from a single 1.8 V analog supply with 1.8 V to 3.3 V digital output drivers. It features 74.3 dBFS SNR at 9.7 MHz input, ±0.45 LSB DNL, and 700 MHz analog input bandwidth, enabling high-fidelity digitization in compact, low-power communication receivers and portable medical ultrasound front-ends.
For engineers reviewing the AD9251BCPZ-20 datasheet, AD9251BCPZ-20 pinout, AD9251BCPZ-20 application, or AD9251BCPZ-20 equivalent, key selection considerations include its 20 MSPS sample rate variant, LFCSP-64 RoHS-compliant package, differential clock interface (CMOS/LVDS/LVPECL), and support for offset binary/gray/twos complement data formatting with programmable clock/data alignment.
Technical Context
The AD9251BCPZ-20 implements a multistage differential pipeline architecture with output error correction logic to guarantee 14-bit accuracy and no missing codes across −40°C to +85°C. Its patented sample-and-hold circuit maintains performance up to 200 MHz input frequency while supporting 2 Vp-p differential analog inputs referenced to an on-chip 1.0 V voltage reference.
Digital control is implemented via a standard SPI interface supporting configuration of clock division (1-to-8), power-down modes, DCO/data timing alignment, and built-in test pattern generation-including deterministic, pseudorandom, and user-defined patterns-without requiring external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonicity and no missing codes over full industrial temperature range |
| Sample Rate | 20 MSPS - fixed maximum conversion rate for this variant, enabling real-time baseband sampling in low-latency systems |
| SNR @ 9.7 MHz | 74.3 dBFS - defines dynamic range for narrowband signal capture in diversity radio and I/Q demodulation |
| DNL | ±0.45 LSB (25°C) - ensures linearity critical for accurate amplitude reconstruction in ultrasound beamforming |
| Analog Input BW | 700 MHz - supports wideband RF sampling up to third Nyquist zone without external filtering |
| Power @ 20 MSPS | 33 mW per channel - enables battery-powered handheld scope meters and portable imaging devices |
| Digital Output Supply | 1.8 V to 3.3 V - allows direct interfacing with FPGA I/O banks or ASIC logic without level-shifting |
Pinout & Package
The AD9251BCPZ-20 is housed in a 64-lead RoHS-compliant LFCSP (CP-64-17) with exposed paddle soldered to AGND for thermal and noise integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (exposed paddle) | Primary ground reference | Mandatory connection to PCB AGND plane for thermal dissipation, noise reduction, and mechanical reliability |
| CLK+, CLK− | Differential encode clock input | Accepts CMOS/LVDS/LVPECL signals; internal bias sets common-mode at 0.9 V for robust clock jitter immunity |
| VIN+A, VIN−A / VIN+B, VIN−B | Dual-channel differential analog inputs | 700 MHz bandwidth; 2 Vp-p full-scale range; require matched 50 Ω termination for optimal SFDR |
| D0A–D13A, D0B–D13B | Parallel CMOS digital outputs | 14-bit per channel; MSB-first; configurable data format (offset binary/gray/twos complement) |
| DCOA, DCOB | Data clock outputs | Source-synchronous clocks aligned to respective channel data edges; programmable phase adjustment |
| SDIO/DCS, SCLK/DFS, CSB | SPI serial interface pins | 3-wire interface for register configuration; DFS/SCLK double-function enables non-SPI static mode setup |
| PDWN, OEB | Power and output control | PDWN high enters 2.2 mW power-down; OEB low enables outputs, high tristates all digital pins |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 1.0 V reference | Eliminates external reference IC and associated layout sensitivity; load regulation error ≤2 mV at 1 mA |
| Programmable clock divider (1-to-8) | Allows use of higher-frequency, lower-jitter master clocks while maintaining precise 20 MSPS sampling |
| Built-in test pattern generation | Reduces test fixture complexity by enabling deterministic BIST without external pattern generators |
| Data output multiplex option | Enables time-multiplexed 14-bit output on shared bus, cutting FPGA pin count and PCB routing density |
| Optional duty cycle stabilizer (DCS) | Compensates for >40% clock duty cycle variation without degrading SNR or SFDR performance |
Applications
| Communications Receiver | Portable Ultrasound Front-End |
|---|---|
|
Use Scenario: Dual-channel I/Q sampling in LTE/W-CDMA diversity radio systems with tight size and power constraints. IC Role / Device Role / Timing Role: Simultaneous digitization of in-phase and quadrature baseband signals at 20 MSPS with synchronized DCO outputs. Use Value: 74.3 dBFS SNR preserves EVM in 16-QAM modulation; low 33 mW/channel power extends battery life in field-deployable units. |
Use Scenario: Beamformed echo digitization in handheld ultrasound probes with integrated analog front-end. IC Role / Device Role / Timing Role: High-linearity ADC capturing 5–15 MHz acoustic return signals with minimal harmonic distortion. Use Value: ±0.45 LSB DNL ensures accurate amplitude mapping for tissue differentiation; 700 MHz input BW supports harmonics-based imaging modes. |
| Smart Antenna Calibration | Handheld Oscilloscope |
|
Use Scenario: Real-time channel gain/phase mismatch measurement across multiple antenna elements in adaptive arrays. IC Role / Device Role / Timing Role: Simultaneous acquisition of reference and element signals with sub-ns inter-channel skew (<0.1 ns). Use Value: Guaranteed no missing codes and <1 ps rms aperture jitter enable precise complex gain ratio calculation at 20 MSPS. |
Use Scenario: Low-cost, battery-operated 2-channel 20 MHz bandwidth oscilloscope with FFT-based spectrum analysis. IC Role / Device Role / Timing Role: Dual-channel digitizer feeding FPGA-based decimation, triggering, and display processing. Use Value: 1.8 V supply and 33 mW/channel operation meet thermal limits in sealed plastic enclosures; SPI configurability simplifies firmware calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 14-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9251BCPZ-40 | Higher 40 MSPS sample rate; identical pinout, package, and feature set | Required for wider instantaneous bandwidth or higher IF sampling in multimode receivers | Select when system demands >20 MSPS without changing PCB layout or firmware register map |
| AD9231BCPZ-20 | 12-bit resolution; lower 71.5 dBFS SNR at 9.7 MHz; same LFCSP-64 footprint and SPI interface | Suitable for cost-sensitive applications where 12-bit ENOB suffices (e.g., basic spectrum monitoring) | Choose for reduced BOM cost and power (22 mW/channel) where 14-bit fidelity is not required |
Compared with AD9251BCPZ-40, the AD9251BCPZ-20 trades sample rate for lower power and jitter sensitivity; compared with AD9231BCPZ-20, it delivers 2 additional bits of resolution and 3 dB higher SNR at the expense of 11 mW/channel extra power consumption.
Availability
AD9251BCPZ-20 is available at Aetrix Electronics and suitable for communications receivers, portable medical imaging, smart antenna calibration, and handheld test equipment requiring stable component supply across long production cycles.
Supply support for AD9251BCPZ-20 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 Norwood, MA.
The AD9251 belongs to Analog Devices' high-speed precision ADC product line, designed specifically for demanding communications, medical imaging, and instrumentation applications where resolution, linearity, and low power must coexist.
FAQ
What is the maximum analog input frequency supported by the AD9251BCPZ-20?
The AD9251BCPZ-20 supports analog input frequencies up to 200 MHz while maintaining specified AC performance, enabled by its 700 MHz analog input bandwidth and optimized sample-and-hold circuit. This allows undersampling of IF signals in communications systems without external anti-alias filtering.
Does the AD9251BCPZ-20 require an external voltage reference?
No, the AD9251BCPZ-20 integrates a precision 1.0 V voltage reference with 0.981 V to 1.005 V output tolerance and ≤2 mV load regulation error. External reference is optional only if higher accuracy or different reference voltage is needed; the internal reference is sufficient for most applications including portable ultrasound and diversity radios.
Can the AD9251BCPZ-20 operate with a 3.3 V digital supply while using a 1.8 V analog supply?
Yes, the AD9251BCPZ-20 supports independent analog (AVDD = 1.8 V) and digital output driver (DRVDD = 1.8 V to 3.3 V) supplies. At DRVDD = 3.3 V, it delivers CMOS-compatible output levels (3.25 V high, 0.2 V low) directly interfacing with 3.3 V FPGA I/O banks without level shifters.
How does the SPI interface of the AD9251BCPZ-20 configure clock/data alignment?
The AD9251BCPZ-20 uses SPI-accessible registers to adjust DCO-to-data phase delay in fine steps, compensating for PCB trace length mismatches. This programmable alignment ensures reliable latching in FPGA receivers even with asymmetric routing, eliminating manual board rework for timing closure.
Is the AD9251BCPZ-20 pin compatible with other members of the AD92xx family?
Yes, the AD9251BCPZ-20 uses the same 64-lead LFCSP package and pinout as the AD9268 (16-bit), AD9258 (14-bit), AD9231 (12-bit), and AD9204 (10-bit) ADCs. This enables hardware reuse and migration paths across resolution and speed grades from 20 MSPS to 125 MSPS without PCB redesign.
AD9251BCPZ-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 20M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-LFCSP-VQ (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD9251BCPZ-20 FAQ
1.How can I place an order for AD9251BCPZ-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9251BCPZ-20 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD9251BCPZ-20 reliable?
The price and inventory of AD9251BCPZ-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9251BCPZ-20 is usually 5 days.
3.What payment methods are accepted for AD9251BCPZ-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9251BCPZ-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9251BCPZ-20?
AD9251BCPZ-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9251BCPZ-20 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD9251BCPZ-20?
For technical support, including AD9251BCPZ-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9251BCPZ-20 requirements.
6.How does Aetrix verify that AD9251BCPZ-20 is sourced from the original manufacturer or authorized distributors?
All AD9251BCPZ-20 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD9251BCPZ-20 meets industry standards.
7.What is the process for return or replacement of AD9251BCPZ-20?
All AD9251BCPZ-20 units undergo pre-shipment inspection (PSI). If there is an issue with AD9251BCPZ-20, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD9251BCPZ-20 part is unused and in its original packaging.
Return procedure for AD9251BCPZ-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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