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Analog Devices Inc. AD7908BRUZ-REEL
- Part No.:
- AD7908BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7908BRUZ-REEL.pdf
- Description:
- IC ADC 8BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,620
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Product details
Overview
AD7908BRUZ-REEL from Analog Devices is an 8-channel, 8-bit, successive approximation analog-to-digital converter (ADC) with integrated channel sequencer, operating at up to 1 MSPS throughput, 2.7 V–5.25 V single supply, and 6 mW max power at 3 V. It supports flexible input ranges (0 V to REFIN or 0 V to 2 × REFIN), SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and automotive-grade operation (−40°C to +85°C). Used in multichannel sensor data acquisition systems requiring compact, low-power, high-speed digitization.
For engineers reviewing the AD7908BRUZ-REEL datasheet, AD7908BRUZ-REEL pinout, AD7908BRUZ-REEL application, or AD7908BRUZ-REEL equivalent, key selection considerations include its 8-bit resolution, 1 MSPS conversion rate, 20-lead TSSOP package, sequencer-controlled 8-channel sampling, and VDRIVE-enabled 3 V/5 V logic compatibility-critical for embedded industrial and automotive signal conditioning designs.
Technical Context
The AD7908BRUZ-REEL implements a standard successive approximation register (SAR) architecture with no pipeline delay, enabling precise sampling control via CS falling edge initiation and deterministic conversion timing tied directly to SCLK frequency (up to 20 MHz). Its on-chip track-and-hold amplifier supports >8 MHz input bandwidth and handles full-scale step inputs with ≤300 ns acquisition time.
Conversion sequencing is managed by a programmable control register that configures channel order, input range (RANGE bit), output coding (CODING bit), and auto-shutdown behavior. The VDRIVE pin decouples logic-level voltage (2.7 V–5.25 V) from AVDD, allowing direct interfacing with mixed-voltage microcontrollers without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - guarantees monotonicity and no missing codes across full temperature range. |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to 500 kHz Nyquist bandwidth. |
| Supply Voltage | 2.7 V to 5.25 V AVDD - single-supply operation simplifies power design; 3 V supply yields 6 mW max power. |
| Input Channels | 8 single-ended - supports multiplexed sensor arrays without external MUX hardware. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP-compatible - interoperable with common MCU peripherals using standard 4-wire protocol. |
| Channel Sequencer | Programmable via control register - allows automatic cycling through preselected channels, reducing host CPU overhead. |
| Shutdown Current | 0.5 μA max - enables ultra-low-power sleep modes in battery-operated systems. |
Pinout & Package
AD7908BRUZ-REEL is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance (θJA = 143°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Master clock for both data transfer and internal conversion timing; supports up to 20 MHz operation. |
| DIN | Data input | Accepts 16-bit control register writes on SCLK falling edges; configures sequencer, range, coding, and shutdown. |
| CS | Chip select (active low) | Initiates conversion on falling edge; frames serial data transactions; enables multi-device SPI bus sharing. |
| DOUT | Data output | Provides 16-bit serial stream: leading zero + 3-bit channel address + 8-bit result + 4 trailing zeros (MSB first). |
| VIN0–VIN7 | Analog input channels | Eight single-ended inputs referenced to AGND; unused channels must be tied to AGND to prevent noise coupling. |
| REFIN | Reference voltage input | Accepts 2.5 V ±1% external reference; sets full-scale range for both 0–REFIN and 0–2×REFIN modes. |
| AVDD | Analog power supply | Supplies core ADC circuitry; must be 4.75–5.25 V for 0–2×REFIN input range operation. |
| VDRIVE | Digital I/O supply | Defines logic thresholds for DIN/DOUT/SCLK/CS; independent of AVDD, enabling 3 V MCU interfacing even with 5 V AVDD. |
| AGND | Analog ground | Common reference for all analog signals (inputs, REFIN, AVDD); four dedicated pins minimize ground impedance. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, sample-accurate timing control via CS edge-critical for synchronized multi-sensor capture. |
| VDRIVE logic supply independence | Allows direct connection to 3 V or 5 V processors without level translation, reducing BOM count and layout complexity. |
| Configurable input range | Software-selectable 0 V to REFIN (straight binary) or 0 V to 2 × REFIN (twos complement), supporting unipolar and bipolar signal conditioning. |
| Auto shutdown mode | Reduces average current to 960 μA at 250 kSPS, optimizing power efficiency in variable-rate acquisition systems. |
| Channel sequencer | Eliminates need for host-driven channel selection; supports fixed or rotating sequences via shadow register programming. |
Applications
| Industrial Sensor Hub | Automotive Battery Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of temperature, pressure, and current sensors in PLC I/O modules. IC Role / Device Role / Timing Role: 8-channel SAR ADC with sequencer acquires synchronized samples across analog inputs at 1 MSPS, feeding data to ARM Cortex-M host via SPI. Use Value: Reduces system latency and host processing load versus discrete ADCs or software-controlled MUX solutions. | Use Scenario: Real-time cell voltage and temperature sampling in 12S Li-ion battery packs for EV BMS. IC Role / Device Role / Timing Role: Digitizes up to eight cell voltages per acquisition cycle with <300 ns acquisition time and automotive-grade reliability (−40°C to +85°C). Use Value: Enables accurate state-of-charge estimation and cell balancing decisions within tight timing windows. |
| Medical Patient Monitor Front-End | Energy Meter Data Acquisition |
Use Scenario: Compact vital sign acquisition unit measuring ECG, SpO₂, and respiration signals. IC Role / Device Role / Timing Role: Low-noise 8-bit ADC digitizes conditioned biopotential signals with 49 dB SINAD at 50 kHz, meeting Class II medical EMC requirements. Use Value: Meets clinical accuracy needs while minimizing power draw (<6 mW at 3 V) for portable operation. | Use Scenario: Multi-phase electricity meter capturing voltage and current waveforms across L1/L2/L3/N lines. IC Role / Device Role / Timing Role: High-throughput ADC samples each phase sequentially using built-in sequencer, supporting 16.67 ms period (60 Hz) waveform reconstruction. Use Value: Achieves Class 0.5 metering accuracy with minimal external components and no FPGA logic overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7918BRUZ-REEL | 10-bit resolution, 61 dB SINAD at 50 kHz, higher DNL (±0.5 LSB), same pinout and interface. | Required where higher dynamic range is needed for precision sensor measurement (e.g., strain gauges, RTDs). | Select AD7918BRUZ-REEL when 10-bit resolution and improved SNR justify cost and power trade-offs over AD7908BRUZ-REEL. |
| AD7928BRUZ-REEL | 12-bit resolution, 70 dB SINAD at 50 kHz, wider gain error (±1.5 LSB), identical package and timing. | Suitable for high-fidelity applications like audio test equipment or vibration analysis requiring extended code depth. | Choose AD7928BRUZ-REEL only if full 12-bit linearity and 70 dB SINAD are mandatory; otherwise AD7908BRUZ-REEL offers optimal cost/power/performance balance. |
Compared with AD7918BRUZ-REEL and AD7928BRUZ-REEL, the AD7908BRUZ-REEL delivers lower power (6 mW vs. 13.5 mW at 5 V), faster wake-up from shutdown (1 μs), and reduced host software overhead due to simpler 8-bit data handling-making it ideal for cost-sensitive, high-volume industrial controls where 8-bit fidelity suffices.
Availability
AD7908BRUZ-REEL is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive battery monitors, medical patient monitors, and energy meter data acquisition requiring stable component supply and long-term production support.
Supply support for AD7908BRUZ-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.
The AD7908BRUZ-REEL belongs to the AD7908/AD7918/AD7928 family of high-speed, low-power, multichannel SAR ADCs designed specifically for space- and power-constrained data acquisition systems in industrial, automotive, and medical applications.
FAQ
What is the maximum sampling rate supported by the AD7908BRUZ-REEL?
The AD7908BRUZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16 SCLK cycles per conversion. This corresponds to a minimum conversion time of 800 ns and enables real-time digitization of signals with up to 500 kHz bandwidth under Nyquist criteria. The actual achievable rate depends on SCLK frequency and interface timing margins in the target system.
Does the AD7908BRUZ-REEL require an external reference voltage?
Yes, the AD7908BRUZ-REEL requires an external reference voltage applied to the REFIN pin. The device is specified for optimal performance with a 2.5 V ±1% reference. This reference sets the full-scale input range for both 0 V to REFIN and 0 V to 2 × REFIN configurations. No internal reference is provided, so accuracy and stability depend entirely on the external reference source.
Can the AD7908BRUZ-REEL interface directly with a 3 V microcontroller while operating from a 5 V analog supply?
Yes, the AD7908BRUZ-REEL supports this configuration via its VDRIVE pin. When VDRIVE is set to 3 V and AVDD is 5 V, the digital interface (DIN, DOUT, SCLK, CS) operates at 3 V logic levels while the analog core runs at 5 V-enabling direct connection to 3 V MCUs without level shifters. Input thresholds scale as 0.7 × VDRIVE (high) and 0.3 × VDRIVE (low), ensuring robust signal integrity.
How does the channel sequencer in the AD7908BRUZ-REEL reduce firmware overhead?
The AD7908BRUZ-REEL's sequencer allows preprogramming of channel scan order (via ADD2–ADD0 bits and SEQ/SHADOW registers), enabling automatic cycling through selected inputs without host intervention. Once initiated, the device performs consecutive conversions on the programmed sequence, outputting channel-addressed results on DOUT. This eliminates repeated register writes and channel selection logic in firmware, cutting CPU cycles and interrupt latency in multichannel acquisition tasks.
What is the guaranteed DC accuracy of the AD7908BRUZ-REEL over temperature?
The AD7908BRUZ-REEL guarantees ±0.2 LSB integral nonlinearity (INL), ±0.2 LSB differential nonlinearity (DNL), ±0.5 LSB offset error, and ±0.2 LSB gain error over the full −40°C to +85°C operating range. These specifications ensure monotonic 8-bit operation with no missing codes and predictable error bounds for calibration-critical applications such as closed-loop control and sensor linearization.
AD7908BRUZ-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:
- 8
- 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:
- -
AD7908BRUZ-REEL FAQ
1.How can I place an order for AD7908BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7908BRUZ-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 AD7908BRUZ-REEL reliable?
The price and inventory of AD7908BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7908BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7908BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7908BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7908BRUZ-REEL?
AD7908BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7908BRUZ-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 AD7908BRUZ-REEL?
For technical support, including AD7908BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7908BRUZ-REEL requirements.
6.How does Aetrix verify that AD7908BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7908BRUZ-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 AD7908BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7908BRUZ-REEL?
All AD7908BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7908BRUZ-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 AD7908BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7908BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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