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Analog Devices Inc. AD7904BRUZ-REEL
- Part No.:
- AD7904BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7904BRUZ-REEL.pdf
- Description:
- IC ADC 8BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,966
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Product details
Overview
AD7904BRUZ-REEL from Analog Devices is an 8-bit, 4-channel, 1 MSPS successive approximation ADC with integrated channel sequencer, single-supply operation (2.7 V to 5.25 V), and SPI-compatible serial interface. It features 0.2 LSB max INL, 6 mW power dissipation at 3 V/1 MSPS, and 16-lead TSSOP packaging - optimized for space-constrained industrial sensor data acquisition systems.
For engineers reviewing the AD7904BRUZ-REEL datasheet, AD7904BRUZ-REEL pinout, AD7904BRUZ-REEL application, or AD7904BRUZ-REEL equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade qualification, real-world sequencing behavior, and direct alternative part comparisons - all grounded in Analog Devices Rev. C datasheet and official package documentation.
Technical Context
The AD7904BRUZ-REEL implements a standard SAR architecture with no pipeline delay, using CS falling edge to initiate sampling and SCLK as both serial clock and conversion master clock. Its internal track-and-hold supports >8 MHz input bandwidth and maintains ±0.05 LSB offset/gain match across four single-ended inputs.
Configuration is managed via a 16-bit control register accessed through DIN/DOUT, enabling selection of input range (0 V to REFIN or 0 V to 2 × REFIN), output coding (straight binary or twos complement), and sequencer mode (fixed or auto-increment). VDRIVE decouples logic interface voltage (2.7 V–5.25 V) from AVDD, allowing direct interfacing with 3 V or 5 V microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; sufficient for cost-sensitive industrial monitoring where high dynamic range is not required. |
| Throughput Rate | 1 MSPS maximum - enables real-time capture of fast transients up to ~500 kHz Nyquist frequency in multi-channel polling. |
| INL / DNL | ±0.2 LSB max each - ensures monotonicity and <0.1% full-scale linearity error, critical for closed-loop control feedback accuracy. |
| Power Dissipation | 6 mW at 3 V / 1 MSPS - enables battery-powered or thermally constrained designs without active cooling. |
| Input Range Options | 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V) - selectable via RANGE bit; supports both ratiometric and absolute reference configurations. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP compatible - uses standard 4-wire protocol (CS, SCLK, DIN, DOUT) with MSB-first, no frame sync overhead. |
| Channel Sequencer | Programmable 4-channel single-ended sequencer - reduces host processor overhead by automatically cycling through VIN0–VIN3 without register rewrites. |
| Operating Temperature | −40°C to +85°C (B version) - qualified for industrial environments including factory automation and motor drive monitoring. |
Pinout & Package
AD7904BRUZ-REEL is housed in a 16-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, and rated for automotive and industrial use. Thermal resistance θJA = 150.4°C/W enables stable operation at full throughput under natural convection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Master clock for both data transfer and internal conversion timing; falling edge clocks DIN, rising edge samples DOUT. |
| DIN | Control register data input | Accepts 16-bit configuration word on falling SCLK edges; sets sequencer mode, input range, coding, and channel address. |
| CS | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial communication; no minimum pulse width required. |
| AGND (Pins 4, 8, 13, 16) | Analog ground reference | Common return for all analog circuitry; must be star-connected to minimize noise coupling into sensitive input/REFIN paths. |
| AVDD (Pins 5, 6) | Analog power supply | Single 2.7 V–5.25 V supply powering SAR core, T/H amplifier, and reference buffer; requires local 10 µF + 100 nF decoupling. |
| REFIN | External reference input | 2.5 V ±1% precision reference input; impedance ~36 kΩ; determines full-scale range and directly impacts gain error and SNR. |
| VIN0–VIN3 (Pins 9–12) | Single-ended analog inputs | Four independent channels multiplexed to internal T/H; support 0 V to REFIN or 0 V to 2×REFIN ranges; unused pins must tie to AGND. |
| DOUT | Serial data output | MSB-first stream: two leading zeros + two address bits + eight data bits + four trailing zeros; tri-state controlled by CS. |
| VDRIVE | Digital I/O supply | Independent 2.7 V–5.25 V logic supply; sets VIH/VIL thresholds and enables level-shifting between ADC and host MCU without external translators. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Sampling instant precisely controlled by CS falling edge; eliminates latency uncertainty in time-critical control loops. |
| Flexible power management | Three operating modes - Normal (2 mA @ 3 V), Auto Shutdown (960 µA @ 250 kSPS), Full Shutdown (0.5 µA) - enable dynamic throughput scaling. |
| VDRIVE decoupled logic interface | Allows direct connection to 3 V or 5 V processors regardless of AVDD; removes need for level shifters in mixed-voltage systems. |
| Guaranteed no missing codes | Validated over full temperature range; ensures deterministic response to monotonic input ramps - essential for position/speed sensing. |
| Channel-to-channel isolation | −85 dB at 400 kHz - prevents crosstalk between sequentially sampled sensors (e.g., current + voltage + temperature in power modules). |
Applications
| Industrial Motor Monitoring | Automotive Battery Management |
|---|---|
|
Use Scenario: Real-time acquisition of phase current, DC-link voltage, and heatsink temperature in BLDC inverter drives. IC Role / Device Role / Timing Role: 4-channel SAR ADC performing synchronized sampling of critical analog signals at 1 MSPS with sequencer-driven channel cycling. Use Value: Enables precise field-oriented control (FOC) with <0.2 LSB INL ensuring accurate torque estimation and thermal derating decisions. |
Use Scenario: Cell voltage and temperature monitoring in 12S Li-ion battery packs for EV traction systems. IC Role / Device Role / Timing Role: Single-chip solution for sequential measurement of up to four cell voltages per cycle, leveraging built-in sequencer to reduce MCU interrupt load. Use Value: −40°C to +85°C B-version rating and 0.5 µA shutdown current support extended battery life during vehicle sleep modes. |
| Programmable Logic Controller I/O Module | Medical Patient Monitor Front-End |
|
Use Scenario: Modular analog input card acquiring 4× 0–10 V process signals (pressure, flow, level, temperature) in factory automation racks. IC Role / Device Role / Timing Role: High-speed, low-power ADC interfaced directly to ARM Cortex-M7 via SPI, with VDRIVE set to 3.3 V to match MCU I/O voltage. Use Value: 6 mW power at 3 V allows dense channel packing without thermal throttling; TSSOP package fits 10 mm × 5 mm PCB footprints. |
Use Scenario: Low-noise acquisition of ECG, respiration, and SpO₂ analog signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision front-end digitizer providing 8-bit resolution at 1 MSPS with 70 dB SNR at 50 kHz - sufficient for baseband bio-signal capture. Use Value: 20 pF input capacitance and ±1 µA leakage minimize loading on high-impedance sensor filters; AGND pin separation reduces digital noise injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7914BRUZ-REEL | 10-bit resolution, 61 dB SNR, ±0.5 LSB INL, same package and pinout | Higher precision required for vibration analysis or calibrated sensor outputs where 8-bit quantization noise is unacceptable | Select when system SNR budget demands >60 dB and INL tolerance tightens to ±0.5 LSB - retains identical layout and firmware structure. |
| ADS7953IRHBT | Texas Instruments 12-bit, 1 MSPS, 16-channel SAR ADC; 3.3 V only; SPI interface; different pinout (QFN-32) | Higher channel count needed for multi-sensor arrays; requires PCB redesign and driver adaptation | Choose only if expanding beyond 4 channels is imminent; not drop-in - new layout, updated HAL, and revised decoupling strategy required. |
Compared with AD7904BRUZ-REEL, AD7914BRUZ-REEL offers 2-bit higher resolution at identical speed and footprint, while ADS7953IRHBT trades pin compatibility for 4× channel density and TI-specific register mapping - making the former a seamless upgrade and the latter a platform-level change.
Availability
AD7904BRUZ-REEL is available at Aetrix Electronics and suitable for industrial motor control, automotive battery monitoring, PLC analog I/O modules, and portable medical diagnostics requiring stable component supply, long-term lifecycle assurance, and automotive-grade qualification.
Supply support for AD7904BRUZ-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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7904BRUZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for industrial and automotive data acquisition where low power, small size, and guaranteed monotonicity outweigh ultra-high resolution requirements.
FAQ
What is the maximum sample rate supported by the AD7904BRUZ-REEL?
The AD7904BRUZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16-clock conversion cycle. At this rate, the total conversion time is 800 ns maximum, and the device delivers guaranteed monotonic 8-bit output with no pipeline delay - enabling deterministic timing for real-time control applications.
Does the AD7904BRUZ-REEL require an external reference voltage?
Yes, the AD7904BRUZ-REEL requires an external reference applied to the REFIN pin. The datasheet specifies 2.5 V ±1% for guaranteed performance; deviation beyond this range affects gain accuracy and SNR. The device does not include an internal reference, and REFIN must be decoupled with ≥1 µF ceramic capacitor close to the pin.
Can the AD7904BRUZ-REEL operate with different supply voltages for analog and digital sections?
Yes - the AD7904BRUZ-REEL separates analog power (AVDD, 2.7 V–5.25 V) from digital I/O power (VDRIVE, also 2.7 V–5.25 V). This allows AVDD to be set to 3.3 V for low-noise analog performance while VDRIVE runs at 5 V to interface with legacy microcontrollers, eliminating level-shifter components in mixed-voltage systems.
How does the channel sequencer function in the AD7904BRUZ-REEL?
The AD7904BRUZ-REEL sequencer cycles through VIN0–VIN3 in programmable order using SEQ1/SEQ0 bits in the control register. Once enabled, it automatically advances to the next channel after each conversion without host intervention - reducing CPU overhead and ensuring consistent inter-channel timing critical for phase-aligned measurements.
Is the AD7904BRUZ-REEL qualified for automotive applications?
No - the AD7904BRUZ-REEL is the B-version (−40°C to +85°C), qualified for industrial use. For automotive applications, Analog Devices offers the W-version (e.g., AD7904WYRUZ) rated −40°C to +125°C and AEC-Q100 qualified. The BRUZ-REEL suffix indicates industrial-grade TSSOP packaging, not automotive qualification.
AD7904BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 4
- 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:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7904BRUZ-REEL FAQ
1.How can I place an order for AD7904BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7904BRUZ-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 AD7904BRUZ-REEL reliable?
The price and inventory of AD7904BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7904BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7904BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7904BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7904BRUZ-REEL?
AD7904BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7904BRUZ-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 AD7904BRUZ-REEL?
For technical support, including AD7904BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7904BRUZ-REEL requirements.
6.How does Aetrix verify that AD7904BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7904BRUZ-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 AD7904BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7904BRUZ-REEL?
All AD7904BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7904BRUZ-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 AD7904BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7904BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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