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Analog Devices Inc. AD9238BSTZ-65
- Part No.:
- AD9238BSTZ-65
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD9238BSTZ-65.pdf
- Description:
- IC ADC 12BIT PIPELINED 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:181
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Product details
Overview
AD9238BSTZ-65 from Analog Devices is a dual-channel, 12-bit, 65 MSPS analog-to-digital converter (ADC) with differential input architecture, integrated voltage reference, and clock duty cycle stabilizer. It delivers 70 dB SNR and 80.5 dBc SFDR at 32.5 MHz input, operates from a single 3 V supply (2.7–3.6 V), and consumes 600 mW total power. It is used in ultrasound front-ends and IF-sampling receivers requiring high channel isolation and wide analog bandwidth.
For engineers reviewing the AD9238BSTZ-65 datasheet, AD9238BSTZ-65 pinout, AD9238BSTZ-65 application, or AD9238BSTZ-65 equivalent, this page provides verified technical context, real-world design meanings for key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AD9238BSTZ-65 employs a multistage differential pipelined ADC architecture with output error correction logic to guarantee no missing codes across −40°C to +85°C. Its dual sample-and-hold amplifiers support 500 MHz 3 dB analog input bandwidth and >85 dB crosstalk immunity between channels.
It features independent or shared reference modes (via SHARED_REF pin), flexible data formatting (offset binary or twos complement via DFS), and multiplexed output mode (MUX_SELECT). The integrated clock duty cycle stabilizer maintains performance across 30–70% duty cycle variation without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonicity and no missing codes over full industrial temperature range. |
| Max Sample Rate | 65 MSPS - supports Nyquist sampling of signals up to 32.5 MHz with sufficient margin for anti-aliasing. |
| SNR / SFDR | 70 dB / 80.5 dBc at fIN = 32.5 MHz - enables high-fidelity digitization in WB-CDMA and ultrasound beamforming. |
| Analog Input Bandwidth | 500 MHz (3 dB) - allows direct RF/IF sampling without external gain blocks for frequencies up to ~200 MHz. |
| Power Consumption | 600 mW total at 65 MSPS - optimized for portable instrumentation where thermal and battery life constraints apply. |
| Channel Isolation | >85 dB at 10 MHz - ensures minimal inter-channel coupling in time-interleaved or dual-path signal processing systems. |
| Duty Cycle Stabilizer | Integrated DCS circuit - eliminates need for external clock conditioning, simplifying layout and reducing BOM count. |
Pinout & Package
The AD9238BSTZ-65 is packaged in a Pb-free, 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad connected to AGND. Pin 1 identifier is marked; AGND must be solidly connected to the exposed pad for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+_A / VIN−_A VIN+_B / VIN−_B |
Differential analog inputs (Ch A & Ch B) | Accept 1 Vp-p to 2 Vp-p input range; require matched PCB routing and termination for optimal SFDR. |
| CLK_A / CLK_B | Independent channel clock inputs | Enable asynchronous sampling; each controls its own SHA-critical for time-skew-sensitive applications like TDD systems. |
| OEB_A / OEB_B | Output enable (active low) | Places respective 12-bit data bus in high-impedance state-enables shared data bus or power-gating of unused channel outputs. |
| PDWN_A / PDWN_B | Channel power-down control | Reduces channel power to ~2 mW standby; outputs hold last valid code (not Hi-Z), preserving system state during sleep. |
| MUX_SELECT | Data multiplexing mode select | When high, disables multiplexed output; when low, interleaves Ch A and Ch B data on single 12-bit bus-saves FPGA I/O resources. |
| DCS | Duty cycle stabilizer enable | Tie high to activate internal DCS; essential for maintaining SNR/SFDR when using crystal oscillators or PLLs with poor duty cycle control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 12-bit pipelined ADC cores | Guaranteed no missing codes and ≤±0.35 LSB DNL across −40°C to +85°C-ensures measurement repeatability in medical and test equipment. |
| Single 3 V supply operation | Eliminates need for separate analog/digital rails; AVDD (2.7–3.6 V) and DRVDD (2.25–3.6 V) allow co-location with 3 V FPGAs or processors. |
| Integrated 1.0 V reference with SENSE pin | Supports both 1 V and 0.5 V internal reference modes; SENSE pin configures reference topology-reduces external component count by ≥3 parts. |
| Flexible data format selection | DFS pin selects offset binary (default) or twos complement-simplifies digital interface to DSPs or ASICs expecting signed integer formats. |
| Out-of-range indicators (OTR_A/B) | Active-high flags signal overflow on respective channel-enables real-time gain adjustment or clipping detection without parsing full data words. |
Applications
| Ultrasound Beamforming | IF Sampling Receiver |
|---|---|
|
Use Scenario: Digitizing 10–20 MHz echo return signals from phased-array transducers with precise time-aligned sampling across 64+ channels. IC Role / Device Role / Timing Role: Dual-channel ADC providing simultaneous sampling of I/Q or adjacent channel pairs; 65 MSPS rate supports 12-bit resolution at 15 MHz IF bandwidth. Use Value: >85 dB channel isolation prevents cross-talk between adjacent receive paths; 70 dB SNR preserves dynamic range for weak tissue reflections. |
Use Scenario: Direct digitization of 70–140 MHz IF signals in CDMA2000/WiMAX baseband receivers, replacing discrete mixer-filter-ADC chains. IC Role / Device Role / Timing Role: High-bandwidth ADC capturing wide instantaneous bandwidth; differential inputs reject common-mode noise from RF front-end stages. Use Value: 500 MHz analog input bandwidth enables first-sampling at 100+ MHz IF; 80.5 dBc SFDR suppresses adjacent channel interference in dense spectrum environments. |
| Battery-Powered Scopemeter | Low-Cost Digital Oscilloscope |
|
Use Scenario: Portable handheld instrument acquiring transient waveforms up to 30 MHz with 12-bit vertical resolution and battery life >4 hours. IC Role / Device Role / Timing Role: Dual ADC enabling interleaved sampling or independent channel capture; low 600 mW power enables thermal management in compact enclosures. Use Value: Single 3 V supply simplifies power architecture; integrated reference and DCS reduce external components-cutting BOM cost and PCB area by ~15%. |
Use Scenario: Entry-level bench oscilloscope targeting 50 MHz analog bandwidth and ≥128 kpts memory depth at sub-$1,000 price point. IC Role / Device Role / Timing Role: Cost-optimized dual ADC delivering 65 MSPS per channel with guaranteed linearity-eliminates need for calibration firmware. Use Value: Pin-compatible with AD9248 (14-bit variant) allows platform reuse; LQFP package supports automated assembly and rework-reducing manufacturing cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9248BSTZ-65 | 14-bit resolution, same 65 MSPS rate, identical pinout and package (64-lead LQFP), but higher 850 mW power consumption. | Used where ENOB >11.4 bits required (e.g., high-precision spectrum analysis); not suitable for battery-powered designs due to power penalty. | Select AD9248BSTZ-65 only if 14-bit resolution is mandatory and thermal/power budgets permit +250 mW. |
| ADS5272IPFP | 12-bit, 65 MSPS, 64-lead HTQFP, but requires separate 1.8 V digital supply and external reference; no integrated DCS or shared-ref mode. | Targeted at TI-based processor ecosystems; lacks crosstalk immunity spec (>85 dB) and has lower typical SNR (68.5 dB). | Choose ADS5272IPFP only when leveraging TI's reference designs or when external reference flexibility outweighs integration benefits of AD9238BSTZ-65. |
Compared with AD9248BSTZ-65 and ADS5272IPFP, the AD9238BSTZ-65 offers optimal balance of resolution, power, and integration for cost-sensitive, thermally constrained dual-channel sampling-delivering 12-bit fidelity with built-in reference, DCS, and channel isolation in a single LQFP package.
Availability
AD9238BSTZ-65 is available at Aetrix Electronics and suitable for ultrasound beamforming, IF sampling receivers, and battery-powered scopemeters requiring stable component supply and long-term industrial temperature support (−40°C to +85°C).
Supply support for AD9238BSTZ-65 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, with R&D and manufacturing operations worldwide.
The AD9238 product line targets high-speed, precision data acquisition in medical imaging, communications infrastructure, and portable test equipment-designed to replace multi-chip solutions with single-package dual ADCs featuring integrated references and robust noise immunity.
FAQ
What is the maximum analog input frequency supported by the AD9238BSTZ-65?
The AD9238BSTZ-65 features a 500 MHz (3 dB) differential analog input bandwidth, enabling reliable sampling of input signals up to ~200 MHz with minimal amplitude roll-off. At 100 MHz input frequency, it maintains 67.6 dB SNR and 75.0 dBc SFDR per the datasheet AC specifications-making it suitable for direct IF sampling in wireless infrastructure applications.
Does the AD9238BSTZ-65 require an external voltage reference?
No, the AD9238BSTZ-65 integrates a precision 1.0 V (or 0.5 V) voltage reference with ±35 mV output error over temperature. The SENSE pin configures reference mode, and REFT/REFB pins provide differential reference connections-eliminating need for external reference ICs in most implementations. External reference is optional but not required.
How does the clock duty cycle stabilizer (DCS) function in the AD9238BSTZ-65?
The DCS circuit in the AD9238BSTZ-65 actively corrects clock duty cycle deviations between 30% and 70%, maintaining SNR and SFDR performance without external duty cycle correction circuitry. When DCS is enabled (DCS pin tied high), the internal circuit reshapes the clock edge timing-allowing use of low-cost crystal oscillators or PLLs with poor inherent duty cycle control.
Can both channels of the AD9238BSTZ-65 operate independently?
Yes, the AD9238BSTZ-65 supports fully independent operation: CLK_A and CLK_B accept asynchronous clocks; PDWN_A/PDWN_B and OEB_A/OEB_B provide per-channel power-down and output enable control; and SHARED_REF pin selects either independent or shared reference configuration-enabling asymmetric sampling rates and signal conditioning per channel.
What is the purpose of the MUX_SELECT pin on the AD9238BSTZ-65?
The MUX_SELECT pin enables or disables multiplexed data output mode. When low, it interleaves Channel A and Channel B 12-bit words onto a single 12-bit data bus (e.g., A0–A11, B0–B11, A0–A11…), reducing FPGA I/O count by half. When high, both channels output simultaneously on dedicated buses-required for real-time dual-channel processing without time-division overhead.
AD9238BSTZ-65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 65M
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.25V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD9238BSTZ-65 FAQ
1.How can I place an order for AD9238BSTZ-65 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9238BSTZ-65 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 AD9238BSTZ-65 reliable?
The price and inventory of AD9238BSTZ-65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9238BSTZ-65 is usually 5 days.
3.What payment methods are accepted for AD9238BSTZ-65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9238BSTZ-65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9238BSTZ-65?
AD9238BSTZ-65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9238BSTZ-65 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 AD9238BSTZ-65?
For technical support, including AD9238BSTZ-65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9238BSTZ-65 requirements.
6.How does Aetrix verify that AD9238BSTZ-65 is sourced from the original manufacturer or authorized distributors?
All AD9238BSTZ-65 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 AD9238BSTZ-65 meets industry standards.
7.What is the process for return or replacement of AD9238BSTZ-65?
All AD9238BSTZ-65 units undergo pre-shipment inspection (PSI). If there is an issue with AD9238BSTZ-65, 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 AD9238BSTZ-65 part is unused and in its original packaging.
Return procedure for AD9238BSTZ-65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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