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Analog Devices Inc. AD9257BCPZ-40
- Part No.:
- AD9257BCPZ-40
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD9257BCPZ-40.pdf
- Description:
- IC ADC 14BIT PIPELINED 64LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
AD9257BCPZ-40 from Analog Devices is an octal, 14-bit, 40 MSPS serial LVDS analog-to-digital converter optimized for medical ultrasound, portable beam-forming systems, and optical networking. It delivers 75.5 dB SNR (to Nyquist), 91.6 dBc SFDR, ±0.6 LSB DNL, and operates from a single 1.8 V supply with 650 MHz full-power analog bandwidth.
For engineers reviewing the AD9257BCPZ-40 datasheet, AD9257BCPZ-40 pinout, AD9257BCPZ-40 application, or AD9257BCPZ-40 equivalent, this page provides verified specifications, validated pin functions, confirmed industrial-temperature operation (−40°C to +85°C), RoHS-compliant 64-lead LFCSP package details, and real-world use context for high-channel-count, low-power sampling systems.
Technical Context
The AD9257BCPZ-40 implements a multistage pipelined ADC architecture with digital error correction logic, enabling 14-bit resolution at 40 MSPS while maintaining <1 ns aperture jitter and 16-clock-cycle pipeline latency. Each of its eight independent channels features programmable clock/data alignment, flexible bit orientation, and built-in deterministic/pseudorandom test pattern generation via SPI.
It supports dual LVDS output modes: ANSI-644 compliant (350 mV typical VOD) and reduced-signal mode (200 mV typical VOD), both with twos-complement coding. The device integrates a 1.0 V internal reference, 0.9 V common-mode voltage output (VCM), and on-chip bias control (RBIAS) for analog front-end tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete amplitude levels per sample for high-fidelity signal capture in ultrasound and RF receivers. |
| Sampling Rate | 40 MSPS - fixed maximum conversion rate for the AD9257BCPZ-40 variant, enabling real-time digitization of IF signals up to 20 MHz (Nyquist). |
| SNR (to Nyquist) | 75.5 dB - measured at fIN = 30.5 MHz, indicating ≤0.55% RMS quantization + thermal noise contribution relative to full-scale signal. |
| SFDR (to Nyquist) | 91.6 dBc - measured at fIN = 30.5 MHz, confirming strong suppression of harmonics and spurs in wideband applications like diversity radio receivers. |
| Analog Bandwidth | 650 MHz - full-power input bandwidth supports direct sampling of L-band and S-band IF signals without external amplification. |
| Supply Voltage | 1.8 V AVDD/DRVDD - single-supply operation reduces board-level power regulation complexity and enables compatibility with modern low-voltage FPGAs. |
| Power Dissipation | 360–464 mW (eight channels, ANSI-644 mode) - scalable power options allow trade-off between LVDS drive strength and system thermal budget. |
| Operating Temperature | −40°C to +85°C - specified industrial temperature range ensures reliability in portable medical and telecom equipment deployed in uncontrolled environments. |
Pinout & Package
AD9257BCPZ-40 is housed in a RoHS-compliant, thermally enhanced 64-lead LFCSP (9 mm × 9 mm) with exposed paddle soldered to analog ground. The package supports high-density PCB layouts and efficient heat dissipation via the thermal pad connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ A / VIN− A | ADC A differential analog input pair | Accepts 2 V p-p differential signal; common-mode voltage set by VCM pin (0.9 V typical); no internal DC bias required. |
| CLK+ / CLK− | Differential sample clock input | Supports CMOS/LVDS/LVPECL logic; 10–520 MHz input clock range; rising-edge sampling triggers conversion pipeline. |
| D+ A / D− A | ADC A serial LVDS data output pair | Transmits 14-bit twos-complement data at DDR rate; output mode configurable via SPI (ANSI-644 or reduced-signal). |
| DCO+ / DCO− | Data clock output | Provides source-synchronous clock for data capture; frequency = fSAMPLE/28 × 2 (DDR), e.g., ~2.86 MHz at 40 MSPS. |
| FCO+ / FCO− | Frame clock output | Signals start of new 14-bit output byte; aligned to DCO edge; used for byte boundary synchronization in FPGA receivers. |
| SDIO/DFS | Serial data I/O / data format select | Configures output resolution (12/14-bit), bit orientation, test patterns; bidirectional SPI interface with DFS function for parallel mode selection. |
| PDWN | Power-down control | Active-high signal; places all eight channels into sub-2 mW standby state; wake-up time = 375 μs from full power-down. |
| RBIAS | Analog bias current setting | Connected to 10 kΩ resistor to AGND; sets internal current sources affecting input stage linearity and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Octal channel integration | Eight independent 14-bit ADCs in one 64-lead LFCSP reduce component count, PCB area, and inter-channel skew vs. discrete solutions. |
| Programmable clock/data alignment | Compensates for PCB trace length mismatches between clock and data paths, enabling reliable DDR LVDS capture at 40 MSPS without external delay lines. |
| Built-in digital test patterns | Includes deterministic, pseudorandom, and user-defined patterns accessible via SPI-eliminates need for external pattern generators during production test. |
| Individual channel power-down | Each ADC channel can be disabled independently; residual power <2 mW per channel allows dynamic channel gating in battery-powered beam-forming systems. |
| Flexible output resolution | Configurable 12-bit or 14-bit output mode via SPI register; permits trade-off between data throughput, FPGA resource usage, and SNR in system-level optimization. |
| Pin compatibility with AD9637 | Shares identical 64-lead LFCSP footprint and pin mapping with the 12-bit octal AD9637, enabling hardware reuse across performance tiers in platform designs. |
Applications
| Medical Ultrasound Imaging | Portable Digital Beam-Forming Systems |
|---|---|
|
Use Scenario: Digitizing echo return signals from 128+ transducer elements in handheld ultrasound probes. IC Role / Device Role / Timing Role: Octal ADC capturing parallel analog receive paths; synchronized sampling across all eight channels enables coherent beam synthesis. Use Value: 75.5 dB SNR preserves tissue contrast resolution; 650 MHz analog bandwidth supports harmonic imaging up to 15 MHz center frequency. |
Use Scenario: Real-time phase-aligned sampling of RF front-end outputs in compact phased-array radar modules. IC Role / Device Role / Timing Role: Eight-channel simultaneous sampling core feeding FPGA-based digital beamformer; DCO/FCO outputs enable precise timing recovery. Use Value: Individual channel power-down reduces power by >95% during idle scan sectors; 1.8 V supply simplifies power delivery in space-constrained enclosures. |
| Quadrature Radio Receivers | Optical Networking Equipment |
|
Use Scenario: I/Q demodulation of broadband wireless signals (e.g., LTE, WiMAX) using direct-conversion receiver architectures. IC Role / Device Role / Timing Role: Paired ADC channels digitizing in-phase and quadrature baseband signals; matched INL/DNL ensures <0.1° phase error across full dynamic range. Use Value: ±1.1 LSB INL and −100 dB crosstalk prevent image rejection degradation; 91.6 dBc SFDR maintains adjacent-channel interference immunity. |
Use Scenario: Monitoring analog monitoring points (e.g., laser bias, TEC current, photodiode output) in 100G/400G coherent optical transceivers. IC Role / Device Role / Timing Role: High-precision, multi-channel telemetry ADC providing real-time health metrics to host controller via SPI-configurable outputs. Use Value: Internal 1.0 V reference and 0.9 V VCM eliminate external precision references; −40°C to +85°C rating ensures operation inside sealed optical modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9257BCPZ-65 | Same architecture and pinout, but rated for 65 MSPS sampling; higher power (547 mW typical) and improved SFDR at >30 MHz input frequencies. | Required when system demands >40 MSPS sampling, such as wideband spectrum analysis or higher-resolution ultrasound frame rates. | Select AD9257BCPZ-65 only if design requires ≥45 MSPS sustained sampling; AD9257BCPZ-40 offers lower power and cost for 40 MSPS-limited systems. |
| AD9637BCPZ-40 | 12-bit octal ADC in identical 64-lead LFCSP; same pinout, power supply, and LVDS interface; lower SNR (70.5 dB) and SFDR (85 dBc) than AD9257BCPZ-40. | Suitable for cost-sensitive applications where 12-bit resolution suffices, e.g., basic telemetry or non-critical sensor monitoring. | Choose AD9637BCPZ-40 to reduce BOM cost and FPGA data path width when 14-bit ENOB is not required for system accuracy targets. |
Compared with AD9257BCPZ-65, the AD9257BCPZ-40 trades 25 MSPS headroom for 187 mW lower typical power at full operation; versus AD9637BCPZ-40, it adds 2 bits of resolution and 6 dB SFDR at the cost of higher FPGA interface bandwidth and slightly increased layout sensitivity.
Availability
AD9257BCPZ-40 is available at Aetrix Electronics and suitable for medical imaging systems, portable ultrasound devices, quadrature radio receivers, and optical network monitoring requiring stable component supply across long product lifecycles.
Supply support for AD9257BCPZ-40 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, automotive, communications, and healthcare markets since 1965.
The AD9257 belongs to Analog Devices' high-speed data converter product line, designed specifically for space-constrained, multi-channel sampling applications demanding low power, excellent dynamic performance, and seamless FPGA interfacing.
FAQ
What is the maximum analog input frequency supported by the AD9257BCPZ-40?
The AD9257BCPZ-40 has a full-power analog bandwidth of 650 MHz, meaning it can accurately digitize input signals up to that frequency while maintaining specified SNR and SFDR performance. At 40 MSPS sampling, the Nyquist frequency is 20 MHz, but the wide analog bandwidth supports undersampling of higher-frequency IF signals-such as 69.5 MHz inputs shown in Figure 25-with 74.7 dB SNR.
Does the AD9257BCPZ-40 require an external voltage reference?
No, the AD9257BCPZ-40 includes an internal 1.0 V reference (±1% over temperature) that is factory-trimmed and fully functional out-of-the-box. The VREF pin can serve as output or input; when used as output, it supplies the internal reference and must be decoupled with a 0.1 µF capacitor to AGND. External reference is optional and only needed for ultra-stable metrology-grade applications.
How does the AD9257BCPZ-40 handle channel synchronization across all eight ADCs?
The AD9257BCPZ-40 uses a single shared sample clock (CLK+/CLK−) and internal pipeline alignment to ensure deterministic, sub-picosecond inter-channel skew. All eight channels sample simultaneously on the same clock edge, and digital outputs are frame-aligned via the common FCO signal. This eliminates need for external deskew circuitry in time-critical applications like ultrasound beam-forming.
Can the AD9257BCPZ-40 operate with reduced LVDS drive strength?
Yes, the AD9257BCPZ-40 supports two LVDS output modes: standard ANSI-644 (350 mV typical VOD) and low-power reduced-signal mode (200 mV typical VOD), selectable via SPI register. The reduced-signal mode lowers driver power consumption and EMI, making it ideal for dense PCB layouts or systems sensitive to crosstalk-without sacrificing timing margin due to guaranteed 1.5–3.1 ns propagation delay spec.
What is the purpose of the RBIAS pin on the AD9257BCPZ-40?
The RBIAS pin sets the internal bias current for the analog input stage and clock buffer by connecting an external 10 kΩ (1%) resistor to AGND. This resistor value is factory-calibrated to optimize DNL, INL, and SNR across temperature; deviation beyond ±1% tolerance degrades linearity and increases input-referred noise, as documented in the "Analog Input Considerations" section of the datasheet.
AD9257BCPZ-40 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):
- 40M
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 8
- Architecture:
- Pipelined
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-LFCSP-VQ (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD9257BCPZ-40 FAQ
1.How can I place an order for AD9257BCPZ-40 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9257BCPZ-40 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 AD9257BCPZ-40 reliable?
The price and inventory of AD9257BCPZ-40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9257BCPZ-40 is usually 5 days.
3.What payment methods are accepted for AD9257BCPZ-40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9257BCPZ-40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9257BCPZ-40?
AD9257BCPZ-40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9257BCPZ-40 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 AD9257BCPZ-40?
For technical support, including AD9257BCPZ-40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9257BCPZ-40 requirements.
6.How does Aetrix verify that AD9257BCPZ-40 is sourced from the original manufacturer or authorized distributors?
All AD9257BCPZ-40 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 AD9257BCPZ-40 meets industry standards.
7.What is the process for return or replacement of AD9257BCPZ-40?
All AD9257BCPZ-40 units undergo pre-shipment inspection (PSI). If there is an issue with AD9257BCPZ-40, 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 AD9257BCPZ-40 part is unused and in its original packaging.
Return procedure for AD9257BCPZ-40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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