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Analog Devices Inc. AD7928BRUZ
- Part No.:
- AD7928BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7928BRUZ.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:315
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Product details
Overview
AD7928BRUZ 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, no pipeline delay, and 20-lead TSSOP packaging for space-constrained industrial data acquisition systems.
For engineers reviewing the AD7928BRUZ datasheet, AD7928BRUZ pinout, AD7928BRUZ application, or AD7928BRUZ equivalent, key selection criteria include guaranteed no-missed-codes to 12 bits, flexible 0 V to REFIN or 0 V to 2 × REFIN input range selection via control register, VDRIVE-independent 3 V/5 V logic interfacing, low 6 mW power at 3 V/1 MSPS, and automotive-qualified −40°C to +125°C operation.
Technical Context
The AD7928BRUZ implements a standard SAR architecture with track-and-hold amplifier supporting >8 MHz input bandwidth and 10 ns aperture delay. Conversion is initiated on the falling edge of CS, with timing fully controlled by SCLK - requiring exactly 16 clock cycles per conversion at up to 20 MHz.
Its sequencer enables preprogrammed cycling across eight single-ended inputs (VIN0–VIN7), while the control register configures input range (RANGE bit), output coding (CODING bit), and channel addressing (ADD2–ADD0). The VDRIVE pin decouples logic-level compatibility from AVDD, allowing direct interfacing with 3 V or 5 V microcontrollers regardless of analog supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonicity and no missing codes across full temperature range. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth. |
| SINAD | 70 dB min at 50 kHz - enables accurate digitization of medium-bandwidth sensor signals with low noise floor. |
| Input Range Options | 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN - selectable via RANGE bit for unipolar or bipolar-referenced measurements. |
| Power Dissipation | 6 mW max at 3 V/1 MSPS - enables battery-powered or thermally constrained embedded monitoring. |
| Shutdown Current | 0.5 μA max - reduces system standby power without external circuitry. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP compatible - ensures drop-in integration with common MCU peripherals. |
Pinout & Package
AD7928BRUZ 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 (Pin 1) | Master clock input | Drives both serial data transfer and internal conversion timing; 20 MHz max rate defines minimum 800 ns conversion time. |
| DIN (Pin 2) | Control register input | Accepts configuration bits (RANGE, CODING, SEQ, ADD2–ADD0) on falling SCLK edges for dynamic mode control. |
| CS (Pin 3) | Conversion trigger & frame sync | Falling edge initiates sampling and conversion; also delimits serial data frames for reliable MCU synchronization. |
| AGND (Pins 4, 8, 17, 20) | Analog ground reference | Must be tied to low-impedance analog ground plane; all analog inputs and REFIN referenced to this node. |
| AVDD (Pins 5, 6) | Analog power supply | 2.7 V to 5.25 V single supply; 4.75–5.25 V required for 0 V to 2 × REFIN input range operation. |
| REFIN (Pin 7) | External reference input | 2.5 V ±1% precision reference sets full-scale range; 36 kΩ input impedance enables buffered or direct connection. |
| VIN0–VIN7 (Pins 9–16) | Single-ended analog inputs | Eight channels multiplexed into internal T/H; unused pins must be tied to AGND to prevent noise coupling. |
| DOUT (Pin 18) | Serial data output | MSB-first stream: leading zero + 3-bit address + 12-bit result; timing aligned to SCLK falling edge. |
| VDRIVE (Pin 19) | Digital I/O voltage reference | Defines logic thresholds independently of AVDD - allows interfacing with 3 V or 5 V processors without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True sample-and-hold timing control via CS edge eliminates latency uncertainty in closed-loop systems. |
| Configurable input range | Software-selectable 0 V to REFIN or 0 V to 2 × REFIN enables optimal dynamic range use for varying sensor outputs. |
| VDRIVE decoupling | Independent logic supply allows mixed-voltage system integration without external level translation components. |
| Channel sequencer | Hardware-controlled cycling across up to 8 inputs reduces MCU overhead and ensures deterministic scan order. |
| Automotive qualification | Rated for −40°C to +125°C operation with AEC-Q100 stress testing compliance for under-hood applications. |
Applications
| Industrial PLC Analog Input Module | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Simultaneous monitoring of 8 temperature, pressure, and current sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 12-bit ADC acquiring synchronized samples from multiple transducers at ≤1 MSPS for real-time control loop execution. Use Value: 70 dB SINAD preserves signal fidelity across wide industrial bandwidth; sequencer eliminates software polling overhead and ensures deterministic channel ordering. | Use Scenario: Cell voltage and temperature sampling across 8-series lithium-ion battery strings in electric vehicle packs. IC Role / Device Role / Timing Role: High-accuracy, multi-channel front-end ADC converting isolated sensor outputs with precise timing control for state-of-charge estimation. Use Value: Automotive-grade −40°C to +125°C rating and guaranteed no-missed-codes ensure reliability in harsh environments; low 0.5 μA shutdown current extends standby battery life. |
| Medical Patient Monitoring Front-End | Test & Measurement Data Logger |
Use Scenario: Acquisition of ECG, respiration, SpO₂, and NIBP signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, 12-bit SAR ADC providing high-fidelity analog-to-digital conversion with minimal power consumption. Use Value: 6 mW at 3 V/1 MSPS enables extended battery runtime; 10 ns aperture jitter minimizes timing-induced distortion in biopotential waveforms. | Use Scenario: Multi-sensor environmental logging (vibration, humidity, ambient light, acoustic) in field-deployable equipment. IC Role / Device Role / Timing Role: General-purpose 8-channel ADC capturing time-correlated measurements across heterogeneous sensors. Use Value: Flexible 0 V to 2 × REFIN input range accommodates both 0–2.5 V and 0–5 V sensor outputs; SPI interface simplifies FPGA or ARM-based controller integration. |
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, but 1.2 MSPS max; uses internal reference (2.5 V); no VDRIVE pin; 16-lead TSSOP. | Requires no external reference; lower pin count; not automotive-qualified; lacks sequencer flexibility. | Select when board space is critical and external reference is undesirable; verify sequencer requirements match. |
| ADS8688IPWR | 8-channel, 12-bit, 1 MSPS; integrated reference; SPI interface; 1.8 V to 5.25 V AVDD; no VDRIVE; 32-lead TQFP. | Higher integration (reference, PGA); wider supply range; larger footprint; no automotive qualification. | Prefer when programmable gain or internal reference simplifies BOM; avoid if VDRIVE decoupling or AEC-Q100 compliance is mandatory. |
Compared with AD7923BRUZ and ADS8688IPWR, the AD7928BRUZ uniquely combines automotive qualification, VDRIVE logic-level independence, external reference flexibility, and hardware sequencer control - making it optimal for safety-critical, mixed-voltage industrial and automotive data acquisition where timing determinism and supply robustness are essential.
Availability
AD7928BRUZ is available at Aetrix Electronics and suitable for industrial PLC analog input modules, automotive battery management systems, medical patient monitoring front-ends, test & measurement data loggers, and environmental sensor networks requiring stable component supply and long-term lifecycle support.
Supply support for AD7928BRUZ 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 AD79xx family - including AD7928BRUZ - was designed for high-speed, low-power, multi-channel data acquisition in industrial, automotive, and medical systems where precision, timing control, and supply flexibility are critical.
FAQ
What is the maximum sampling rate supported by the AD7928BRUZ?
The AD7928BRUZ supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16-clock-cycle conversion time. This rate is maintained across its full operating temperature range (−40°C to +125°C) and supply range (2.7 V to 5.25 V), with no pipeline delay affecting timing predictability. The AD7928BRUZ maintains guaranteed 12-bit no-missing-codes performance at this rate.
Does the AD7928BRUZ require an external reference voltage?
Yes, the AD7928BRUZ requires an external reference voltage applied to the REFIN pin. The datasheet specifies 2.5 V ±1% for guaranteed performance, with input impedance of 36 kΩ at 1 MSPS. The AD7928BRUZ does not include an internal reference; using an external precision reference ensures optimal INL, DNL, and SINAD performance across temperature and supply variations.
How does the VDRIVE pin function in the AD7928BRUZ?
The VDRIVE pin on the AD7928BRUZ sets the logic threshold voltages for all digital I/O pins (CS, SCLK, DIN, DOUT), independent of the analog supply AVDD. This allows direct interfacing with 3 V or 5 V microcontrollers without level shifters - for example, AVDD can be 3.3 V while VDRIVE is 5 V to match a host processor's I/O voltage. The AD7928BRUZ supports VDRIVE from 2.7 V to 5.25 V.
Can the AD7928BRUZ operate in automotive temperature conditions?
Yes, the AD7928BRUZ is qualified for automotive applications with an extended operating temperature range of −40°C to +125°C, per the datasheet's Automotive Products section. It meets AEC-Q100 stress testing requirements and is rated for use in engine control units, battery management systems, and other under-hood or cabin applications where high-temperature reliability is mandatory.
What is the purpose of the channel sequencer in the AD7928BRUZ?
The channel sequencer in the AD7928BRUZ enables hardware-controlled, preprogrammed cycling through up to eight analog input channels (VIN0–VIN7) without MCU intervention. Configured via the SEQ and ADD2–ADD0 bits in the control register, it reduces firmware overhead, ensures deterministic scan order, and improves system timing repeatability - especially valuable in real-time control and synchronized multi-sensor acquisition. The AD7928BRUZ sequencer supports both single-shot and continuous modes.
AD7928BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7928BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7928BRUZ 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 reliable?
The price and inventory of AD7928BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7928BRUZ is usually 5 days.
3.What payment methods are accepted for AD7928BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7928BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7928BRUZ?
AD7928BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7928BRUZ 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?
For technical support, including AD7928BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7928BRUZ requirements.
6.How does Aetrix verify that AD7928BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7928BRUZ 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 meets industry standards.
7.What is the process for return or replacement of AD7928BRUZ?
All AD7928BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7928BRUZ, 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 part is unused and in its original packaging.
Return procedure for AD7928BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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