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Analog Devices Inc. AD9731BRS-REEL
- Part No.:
- AD9731BRS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD9731BRS-REEL.pdf
- Description:
- IC DAC 10BIT 170MSPS 28-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,266
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Product details
Overview
AD9731BRS-REEL from Analog Devices is a 10-bit, 170 MSPS bipolar digital-to-analog converter optimized for high dynamic performance in communications and waveform synthesis applications. It delivers 50 dB wideband SFDR at 65 MHz output, 3.8 ns voltage settling time to 1/2 LSB, and integrated internal voltage reference (–1.25 V), operating from –40°C to +85°C in 28-lead SSOP.
For engineers reviewing the AD9731BRS-REEL datasheet, AD9731BRS-REEL pinout, AD9731BRS-REEL application, or AD9731BRS-REEL equivalent, this page provides verified technical context, real-world timing behavior, analog output compliance (–1.5 V to +3 V), power dissipation (439 mW @ 170 MSPS), and validated alternative options for DAC replacement in HFC upstream path and DDS systems.
Technical Context
The AD9731BRS-REEL employs MSB decoding with thermometer-coded segmentation to minimize glitch impulse (4.1 pV·s) while maintaining 10-bit linearity without trimming. Its edge-triggered register synchronizes TTL/CMOS-compatible inputs with precise setup (2 ns) and hold (1.0 ns) timing relative to the rising clock edge.
It integrates a bandgap-based internal reference (–1.25 V ±8%), a control amplifier with 2.5 MHz bandwidth, and complementary current outputs (IOUT/IOUTB) steered via statistical current source matching. Full-scale output current is set by RSET (nominal 1.96 kΩ) and CONTROL AMP IN per IFS = 32 × (CONTROL AMP IN / RSET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - supports precise amplitude quantization for baseband and IF signal reconstruction |
| Max Conversion Rate | 170 MSPS - enables Nyquist-limited analog output up to 85 MHz, suitable for 65 MHz HFC upstream transmit spectrum |
| Wideband SFDR | 50 dB @ 65 MHz fOUT - defines usable spurious-free bandwidth in digital communications transmitters |
| Settling Time | 3.8 ns to 1/2 LSB - ensures accurate waveform fidelity in fast-switching DDS and imaging applications |
| Output Compliance | –1.5 V to +3 V - allows direct interfacing with standard 50 Ω loads or op-amp I-to-V stages without level-shifting |
| Power Dissipation | 439 mW @ 170 MSPS - balances performance and thermal management in dense RF subsystems |
| Internal Reference | –1.25 V ±8% - eliminates need for external reference in cost-sensitive designs; drift ≤100 mV/°C |
Pinout & Package
AD9731BRS-REEL is housed in a 28-lead Shrink Small Outline Package (SSOP), RS-28 footprint, compliant with JEDEC MO-150AH, measuring 10.50 mm × 5.60 mm × 1.85 mm (max height), with 0.65 mm lead pitch and coplanarity ≤0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D9(MSB)–D0(LSB) | 10-bit parallel digital input bus | TTL/CMOS-compatible; latched on rising CLOCK edge; defines output current magnitude |
| CLOCK | Edge-triggered latch enable | Rising-edge sensitive; requires 2 ns setup/1.0 ns hold; drives internal register synchronization |
| IOUT / IOUTB | Complementary current outputs | Sum equals full-scale current minus 1 LSB; require matched resistive loading for optimal INL/DNL |
| RSET | Reference set resistor connection | Nominal 1.96 kΩ; sets full-scale output current per IFS = 32 × (CONTROL AMP IN / RSET) |
| REF OUT / CONTROL AMP IN / CONTROL AMP OUT / REF IN | Internal reference and control amplifier interface | Configurable for internal (–1.25 V) or external reference; supports low-frequency (2.5 MHz) or wideband (75 MHz) multiplying operation |
| DIGITAL ±VS / ANALOG ±VS | Separate supply rails | +5 V / –5.2 V dual supplies isolate digital noise from analog output path |
| GND (Pins 15, 18, 28) | Ground connections | Digital and analog grounds must be partitioned and joined at single point to minimize coupling |
Key Features
| Feature | Design Value |
|---|---|
| 170 MSPS update rate | Enables direct synthesis of signals up to 85 MHz Nyquist frequency, meeting HFC upstream spectral mask requirements |
| 66 dB SFDR @ 2 MHz | Supports clean baseband generation for digital communications where harmonic distortion must be suppressed below –66 dBc |
| 3.8 ns settling to 1/2 LSB | Reduces timing uncertainty in high-speed waveform reconstruction, critical for pulse-shaped modulation schemes |
| Integrated –1.25 V reference | Eliminates external reference component count and layout complexity while maintaining ±8% initial accuracy |
| Pin-compatible with AD9721 | Allows drop-in upgrade path in existing SOIC-based designs; SSOP variant (AD9731BRS-REEL) offers space savings without functional change |
Applications
| Digital Communications Transmitter | Direct Digital Synthesis (DDS) |
|---|---|
Use Scenario: Transmit path in cable modem upstream channel (5–65 MHz) requiring low spurious emissions and stable gain over temperature. IC Role / Device Role / Timing Role: Primary DAC generating RF-modulated current output synchronized to high-stability system clock. Use Value: 50 dB SFDR at 65 MHz and <100 ppm/°C reference drift ensure compliance with DOCSIS spectral mask and long-term calibration stability. |
Use Scenario: Programmable waveform generator in test equipment producing arbitrary sine, chirp, or modulated signals up to 40 MHz. IC Role / Device Role / Timing Role: High-fidelity current-source DAC feeding high-speed op-amp I-to-V stage for low-noise voltage output. Use Value: 3.8 ns settling and 66 dB SFDR @ 2 MHz enable sub-degree phase resolution and minimal harmonic contamination in synthesized waveforms. |
| High-Speed Imaging System | Waveform Reconstruction in Radar |
Use Scenario: Line-scan camera digitizer requiring precise analog drive for CCD bias or timing control with minimal transient artifacts. IC Role / Device Role / Timing Role: Precision current source controlling pixel exposure duration or analog front-end bias voltage. Use Value: Glitch impulse of only 4.1 pV·s prevents image streaking or timing jitter during rapid digital word transitions. |
Use Scenario: Pulse compression waveform generator in L-band radar, demanding narrowband SFDR >79 dB and fast settling for pulse fidelity. IC Role / Device Role / Timing Role: High-linearity DAC converting stored chirp coefficients into analog IF signal for upconversion. Use Value: 79 dB narrowband SFDR at 2 MHz span and 0.35 LSB typical DNL preserve pulse compression ratio and reduce sidelobe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9721BR-REEL | 10-bit, 160 MSPS; higher power (520 mW); no internal reference; requires external REF | Legacy design requiring additional reference IC and decoupling; wider SOIC package only | Select when legacy board compatibility with AD9721 footprint is mandatory and internal reference is not needed |
| AD9744BCPZ-REEL7 | 14-bit, 210 MSPS; LVDS inputs; 1.8 V/3.3 V supplies; no internal reference; 32-lead LFCSP | Higher resolution and speed but incompatible pinout, voltage domains, and interface; requires full redesign | Select when >10-bit resolution and >170 MSPS are required, and layout revision is acceptable |
Compared with AD9731BRS-REEL, AD9721BR-REEL offers proven reliability but increases BOM count and power; AD9744BCPZ-REEL delivers superior specs but demands new PCB layout and level-shifting-making AD9731BRS-REEL the optimal balance of integration, performance, and drop-in upgrade capability in SSOP space-constrained designs.
Availability
AD9731BRS-REEL is available at Aetrix Electronics and suitable for digital communications transmitters, direct digital synthesis systems, high-speed imaging subsystems, and radar waveform generators requiring stable component supply across extended industrial temperature range (–40°C to +85°C).
Supply support for AD9731BRS-REEL 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, serving precision instrumentation, communications, and industrial markets.
The AD97xx DAC product line was designed specifically for high-dynamic-range, high-speed waveform synthesis in communications infrastructure-emphasizing SFDR, settling time, and integrated reference functionality over raw resolution or ultra-high sample rates.
FAQ
What is the maximum analog output frequency supported by the AD9731BRS-REEL?
The AD9731BRS-REEL supports analog output frequencies up to 65 MHz with 50 dB SFDR and up to 85 MHz within Nyquist limit (half the 170 MSPS update rate). Its wideband SFDR degrades above 65 MHz, making 65 MHz the practical upper bound for communication-grade spectral purity. The AD9731BRS-REEL achieves this using internal current steering and statistical matching, not external filtering.
Does the AD9731BRS-REEL include an internal voltage reference, and what is its accuracy?
Yes, the AD9731BRS-REEL integrates a bandgap-based internal voltage reference nominally at –1.25 V, with initial accuracy of ±8% (–1.35 V to –1.15 V) and drift of ≤100 mV/°C over –40°C to +85°C. This reference feeds the internal control amplifier and enables self-contained operation without external reference components-confirmed in the AD9731BRS-REEL datasheet Section "REFERENCE/CONTROL AMP".
What is the recommended RSET value for full-scale output current on the AD9731BRS-REEL?
The nominal RSET value for the AD9731BRS-REEL is 1.96 kΩ, yielding a full-scale output current of 20.4 mA when CONTROL AMP IN is at –1.25 V (per IFS = 32 × (CONTROL AMP IN / RSET)). This value is specified in the AD9731BRS-REEL datasheet under "AD9731–SPECIFICATIONS" and validated across temperature for production units.
Can the AD9731BRS-REEL operate with a single supply, or does it require dual supplies?
The AD9731BRS-REEL requires dual analog and digital supplies: DIGITAL +VS = +5 V, DIGITAL –VS = –5.2 V, and ANALOG –VS = –5.2 V. It does not support single-supply operation. The analog output compliance range (–1.5 V to +3 V) and internal reference polarity (–1.25 V) mandate negative rail capability-verified in Absolute Maximum Ratings and DC Accuracy specifications for AD9731BRS-REEL.
Is the AD9731BRS-REEL pin-compatible with the AD9731BR-REEL?
No-the AD9731BRS-REEL (28-lead SSOP, RS-28) and AD9731BR-REEL (28-lead SOIC, R-28) share identical pin functions and signal assignments but differ in physical package dimensions, lead pitch (0.65 mm vs. 1.27 mm), and mounting footprint. They are functionally identical and electrically interchangeable, but not mechanically pin-compatible without PCB redesign.
AD9731BRS-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- -
- Number of D/A Converters:
- -
- Settling Time:
- -
- Output Type:
- -
- Differential Output:
- -
- Data Interface:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- INL/DNL (LSB):
- -
- Architecture:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD9731BRS-REEL FAQ
1.How can I place an order for AD9731BRS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9731BRS-REEL 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 AD9731BRS-REEL reliable?
The price and inventory of AD9731BRS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9731BRS-REEL is usually 5 days.
3.What payment methods are accepted for AD9731BRS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9731BRS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9731BRS-REEL?
AD9731BRS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9731BRS-REEL 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 AD9731BRS-REEL?
For technical support, including AD9731BRS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9731BRS-REEL requirements.
6.How does Aetrix verify that AD9731BRS-REEL is sourced from the original manufacturer or authorized distributors?
All AD9731BRS-REEL 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 AD9731BRS-REEL meets industry standards.
7.What is the process for return or replacement of AD9731BRS-REEL?
All AD9731BRS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD9731BRS-REEL, 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 AD9731BRS-REEL part is unused and in its original packaging.
Return procedure for AD9731BRS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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