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Analog Devices Inc. AD7928BRUZ-REEL
- Part No.:
- AD7928BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7928BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:128
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Product details
Overview
AD7928BRUZ-REEL from Analog Devices is a 12-bit, 1 MSPS, 8-channel successive approximation ADC with integrated channel sequencer, operating from a single 2.7 V to 5.25 V supply and delivering 70 dB min SINAD at 50 kHz input frequency. It features SPI/QSPI/MICROWIRE/DSP-compatible serial interface, 0.5 μA max shutdown current, and 20-lead TSSOP package qualified for automotive applications.
For engineers reviewing the AD7928BRUZ-REEL datasheet, AD7928BRUZ-REEL pinout, AD7928BRUZ-REEL application, or AD7928BRUZ-REEL equivalent, key selection considerations include 12-bit resolution with guaranteed no missing codes, flexible 0 V to REFIN or 0 V to 2 × REFIN input range selection via control register, VDRIVE pin enabling independent 3 V/5 V logic interfacing, low-power operation (6 mW max at 3 V), and channel sequencing capability for automated multi-input acquisition.
Technical Context
The AD7928BRUZ-REEL implements a standard successive approximation architecture with no pipeline delay, where conversion is initiated on the falling edge of CS and controlled entirely by SCLK frequency-16 cycles required per conversion. Its track-and-hold amplifier supports >8 MHz input bandwidth and achieves 1.6 MHz full-power bandwidth at 0.1 dB.
Internal configuration is managed via a programmable control register that selects input range (RANGE bit), output coding (CODING bit), sequencer enable (SEQ bit), and channel address (ADD2–ADD0). The sequencer allows preprogrammed cycling across up to eight single-ended inputs (VIN0–VIN7), with automatic channel indexing and result tagging in the serial output stream.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits with guaranteed no missing codes-ensures monotonicity and deterministic full-scale behavior in closed-loop control. |
| Throughput Rate | 1 MSPS maximum-supports real-time sampling of fast transients in motor control or power quality monitoring. |
| SINAD | 70 dB min at 50 kHz input-enables accurate representation of high-fidelity sensor signals such as precision current/voltage sensing. |
| Power Dissipation | 6 mW max at 3 V supply-reduces thermal load and simplifies power budgeting in space-constrained industrial modules. |
| Shutdown Current | 0.5 μA max-allows deep sleep between measurement bursts in battery-powered data loggers. |
| Input Range Options | 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V)-configurable via RANGE bit to match sensor output swing without external scaling. |
| VDRIVE Supply | Independent 2.7 V to 5.25 V logic rail-permits direct interfacing to 3 V microcontrollers while AVDD runs at 5 V for optimal analog performance. |
Pinout & Package
AD7928BRUZ-REEL is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin assignments are validated per Analog Devices Rev. E datasheet Figure 3 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Master clock for both data transfer and internal conversion timing; 10 kHz–20 MHz range enables throughput scaling from 62.5 kSPS to 1 MSPS. |
| DIN | Control register data input | Accepts 8-bit configuration words on falling SCLK edges to set RANGE, CODING, SEQ, and channel address bits. |
| CS | Active-low chip select | Initiates sample acquisition on falling edge; frames serial data transaction and synchronizes conversion start. |
| AGND (Pins 4, 8, 17, 20) | Analog ground reference | Common return for all analog circuitry; multiple pins reduce ground impedance and improve noise immunity in mixed-signal layouts. |
| AVDD (Pins 5, 6) | Analog power supply | Single 2.7 V–5.25 V rail powers analog core; dual pins lower supply impedance and support higher dynamic performance. |
| REFIN (Pin 7) | External reference input | Accepts 2.5 V ±1% reference; sets full-scale range and directly impacts gain accuracy and INL performance. |
| VIN0–VIN7 (Pins 9–16) | Single-ended analog inputs | Eight dedicated channels with internal multiplexer; unused inputs must be tied to AGND to prevent noise coupling. |
| DOUT (Pin 18) | Serial data output | MSB-first stream includes 1 leading zero + 3 address bits + 12 data bits-enables unambiguous channel identification in sequenced reads. |
| VDRIVE (Pin 19) | Digital I/O power supply | Decouples logic interface voltage from AVDD; allows 3 V MCU to drive 5 V AVDD system without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Sampled value appears in DOUT within 16 SCLK cycles-enables deterministic latency-critical feedback loops in servo drives. |
| Programmable input range | 0 V to REFIN or 0 V to 2 × REFIN selected via RANGE bit-eliminates need for external op-amp gain stages when interfacing bipolar sensors. |
| Channel sequencer | Preprogrammed cycling across VIN0–VIN7 with auto-incremented addressing-reduces host CPU overhead in multi-sensor monitoring systems. |
| Flexible power management | Auto shutdown mode reduces current to 960 μA at 250 kSPS; full shutdown draws only 0.5 μA-extends battery life in portable instrumentation. |
| Automotive qualification | Specified over −40°C to +125°C junction temperature-meets AEC-Q100 stress test requirements for under-hood automotive ECUs. |
Applications
| Motor Control Feedback | Industrial Data Acquisition |
|---|---|
Use Scenario: Real-time sampling of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: 12-bit ADC captures synchronized current/voltage waveforms at ≥10× fundamental frequency for field-oriented control. Use Value: 70 dB SINAD ensures accurate torque estimation; sequencer automates round-robin sampling across 6 current sense points and 2 voltage rails. | Use Scenario: Multi-channel sensor monitoring in PLC analog input modules for temperature, pressure, and flow. IC Role / Device Role / Timing Role: Centralized 8-channel digitizer with configurable input ranges handles diverse 4–20 mA, thermocouple, and RTD signal conditioning outputs. Use Value: VDRIVE independence allows direct connection to 3.3 V ARM Cortex-M host; 1 MSPS throughput supports oversampling for enhanced ENOB in noisy factory environments. |
| Automotive Battery Management | Medical Patient Monitoring |
Use Scenario: Cell voltage and temperature monitoring in EV traction battery packs with thermal runaway detection. IC Role / Device Role / Timing Role: High-accuracy ADC interfaces to isolated voltage dividers and thermistors across 8 series-connected cells. Use Value: Guaranteed no missing codes prevents false fault triggers; −40°C to +125°C operation ensures reliability in extreme under-hood conditions. | Use Scenario: Simultaneous acquisition of ECG, respiration, and SpO₂ analog front-end signals in portable patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-power ADC digitizes biopotential signals with minimal added thermal noise and power dissipation. Use Value: 6 mW max power at 3 V extends runtime in battery-operated devices; 8.2 MHz full-power bandwidth preserves high-frequency ECG morphology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7923BRUZ | 8-channel, 12-bit, 1 MSPS SAR ADC in same 20-lead TSSOP; differs in reference handling-requires internal REFOUT (2.5 V) rather than external REFIN. | Lacks external reference flexibility; not suitable where precision external references (e.g., buried Zener) are used for long-term stability. | Select AD7923BRUZ only when internal reference suffices and board layout favors reduced external component count. |
| ADS8325IPW | 8-channel, 12-bit, 100 kSPS SAR ADC in 20-TSSOP; significantly lower throughput (100 kSPS vs. 1 MSPS) and higher power (15 mW at 5 V). | Targeted at lower-speed, higher-precision applications like process control where SNR >72 dB is prioritized over speed. | Choose ADS8325IPW when absolute SNR (73 dB typ) outweighs throughput needs and system clock constraints permit slower sampling. |
Compared with AD7923BRUZ, AD7928BRUZ-REEL offers external reference control for improved system-level accuracy calibration, while versus ADS8325IPW it delivers 10× higher throughput and 60% lower power at 3 V-making it optimal for high-dynamic industrial and automotive sensing where speed, efficiency, and configurability are critical.
Availability
AD7928BRUZ-REEL is available at Aetrix Electronics and suitable for motor control feedback, industrial data acquisition, automotive battery management, and medical patient monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7928BRUZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The AD79xx family-including AD7928BRUZ-REEL-is engineered for high-speed, low-power, multi-channel data acquisition in industrial automation, automotive systems, and medical instrumentation where precision, reliability, and small-footprint integration are essential.
FAQ
What is the maximum sampling rate supported by the AD7928BRUZ-REEL?
The AD7928BRUZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK frequency requiring exactly 16 clock cycles per conversion. At lower SCLK frequencies, the sampling rate scales linearly-for example, 10 MHz SCLK yields 625 kSPS. This fixed-cycle timing eliminates variable latency and ensures deterministic behavior in time-critical applications.
Does the AD7928BRUZ-REEL require an external reference voltage?
Yes, the AD7928BRUZ-REEL requires an external reference voltage applied to the REFIN pin, specified at 2.5 V ±1% for guaranteed performance. Unlike some members of the AD79xx family, it does not include an internal reference buffer or reference output; REFIN directly sets the full-scale range for both 0 V to REFIN and 0 V to 2 × REFIN configurations.
How does the channel sequencer function in the AD7928BRUZ-REEL?
The AD7928BRUZ-REEL's sequencer is configured via the SEQ bit and ADD2–ADD0 bits in the control register. When enabled, it automatically cycles through a user-defined subset of VIN0–VIN7 in ascending order, tagging each conversion result with its source channel address in the DOUT stream. No host intervention is needed between conversions, reducing firmware overhead in multi-sensor systems.
Can the AD7928BRUZ-REEL interface directly with a 3.3 V microcontroller while operating at 5 V AVDD?
Yes, the VDRIVE pin enables independent logic-level interfacing: connect VDRIVE to 3.3 V and AVDD to 5 V, allowing the AD7928BRUZ-REEL's SCLK, CS, DIN, and DOUT signals to operate at 3.3 V logic levels while maintaining optimal analog performance from the 5 V analog supply-no external level shifters are required.
What is the guaranteed performance temperature range for the AD7928BRUZ-REEL?
The AD7928BRUZ-REEL is qualified for automotive applications and specified over a junction temperature range of −40°C to +125°C. This extended range is validated per AEC-Q100 requirements and applies to all key parameters including INL, SINAD, and throughput rate-making it suitable for under-hood and other harsh-environment deployments.
AD7928BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7928BRUZ-REEL FAQ
1.How can I place an order for AD7928BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7928BRUZ-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 AD7928BRUZ-REEL reliable?
The price and inventory of AD7928BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7928BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7928BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7928BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7928BRUZ-REEL?
AD7928BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7928BRUZ-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 AD7928BRUZ-REEL?
For technical support, including AD7928BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7928BRUZ-REEL requirements.
6.How does Aetrix verify that AD7928BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7928BRUZ-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 AD7928BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7928BRUZ-REEL?
All AD7928BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7928BRUZ-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 AD7928BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7928BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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