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Analog Devices Inc. AD7904WYRUZ-REEL7
- Part No.:
- AD7904WYRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7904WYRUZ-REEL7.pdf
- Description:
- IC ADC 8BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:773
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Product details
Overview
AD7904WYRUZ-REEL7 from Analog Devices is an 8-bit, 4-channel, single-supply successive approximation ADC with integrated channel sequencer, 1 MSPS throughput, 0.2 LSB INL max, and 16-lead TSSOP package. It operates from 2.7 V to 5.25 V AVDD, supports 0 V to REFIN or 0 V to 2 × REFIN input ranges, and delivers 49 dB SINAD at 50 kHz - suited for automotive sensor signal acquisition in engine control units.
For engineers reviewing the AD7904WYRUZ-REEL7 datasheet, AD7904WYRUZ-REEL7 pinout, AD7904WYRUZ-REEL7 application, or AD7904WYRUZ-REEL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade timing behavior, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The AD7904WYRUZ-REEL7 implements a standard SAR architecture with no pipeline delay, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its track-and-hold amplifier supports >8 MHz input bandwidth and maintains ±0.2 LSB INL across −40°C to +125°C.
It uses a 2-bit address + 8-bit data serial output format (MSB first), with configurable straight binary or twos complement coding via the CODING bit. The sequencer enables preprogrammed cycling among VIN0–VIN3 using SEQ1/SEQ0 bits, and VDRIVE decouples logic interface voltage (2.7 V to 5.25 V) from AVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; sufficient for cost-sensitive automotive sensor digitization where high dynamic range is not required. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients such as knock detection or camshaft position signals in ICE control systems. |
| INL / DNL | ±0.2 LSB max / ±0.2 LSB max - ensures monotonicity and <0.1% full-scale linearity error without calibration in closed-loop feedback paths. |
| SINAD @ 50 kHz | 48.5 dB min (W grade) - enables accurate measurement of low-amplitude analog sensor outputs (e.g., piezoresistive pressure sensors) up to ~10 kHz effective bandwidth. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - allows integration into power-constrained ECU modules without thermal derating or forced cooling. |
| Supply Range | AVDD = 2.7 V to 5.25 V - compatible with automotive 3.3 V and 5 V domains; REFIN = 2.5 V ±1% required for specified performance. |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 Grade 1, enabling direct placement in under-hood engine management subsystems. |
Pinout & Package
AD7904WYRUZ-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 1 is SCLK; pins 4, 8, 13, and 16 are AGND; pins 5 and 6 are AVDD; pin 15 is VDRIVE; and analog inputs occupy pins 9–12 (VIN0–VIN3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Master clock for both data transfer and internal conversion timing; 10 kHz–20 MHz range enables flexible throughput scaling without external clock generator. |
| CS (Pin 3) | Active-low chip select | Initiates sampling on falling edge and frames SPI-compatible readout; supports multi-drop bus sharing with precise timing control (tQUIET ≥50 ns). |
| VIN0–VIN3 (Pins 9–12) | Single-ended analog inputs | Four independent channels with programmable sequencer; unused inputs must be tied to AGND to prevent noise coupling into T/H amplifier. |
| REFIN (Pin 4) | External reference input | Accepts 2.5 V ±1% reference only; impedance of 36 kΩ requires low-Z source or buffer to avoid gain error drift during conversion. |
| VDRIVE (Pin 15) | Digital I/O supply | Decouples logic interface voltage from AVDD - allows direct connection to 3 V or 5 V microcontrollers without level shifters. |
| DOUT (Pin 14) | Serial data output | MSB-first stream: two leading zeros + 2-bit channel ID + 8-bit result + four trailing zeros; compatible with SPI, QSPI, MICROWIRE, and DSP interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Sampling instant precisely controlled by CS falling edge; eliminates latency uncertainty in time-critical control loops like fuel injection timing. |
| Channel sequencer | Hardware-programmable cycling across all four inputs via SEQ1/SEQ0 bits - reduces firmware overhead in multi-sensor polling architectures. |
| VDRIVE interface isolation | Independent 2.7 V–5.25 V logic supply enables mixed-voltage system integration (e.g., 3.3 V MCU with 5 V analog front-end) without external level translation. |
| Automotive qualification | AEC-Q100 Grade 1 certified (−40°C to +125°C); includes robust ESD protection (1.5 kV HBM) and PSRR >60 dB up to 100 kHz for noisy engine bay environments. |
| Low-power shutdown | 0.5 µA max full shutdown current - enables energy-efficient wake-on-event operation in battery-backed automotive subsystems. |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Digitizing analog signals from manifold absolute pressure (MAP), throttle position (TPS), and coolant temperature sensors in real time. IC Role / Device Role / Timing Role: 4-channel SAR ADC with sequencer performs synchronized sampling of critical engine parameters at 1 MSPS for closed-loop combustion control. Use Value: 8-bit resolution and ±0.2 LSB INL ensure deterministic sensor mapping accuracy within AEC-Q100 Grade 1 operating range, eliminating need for post-processing calibration. |
Use Scenario: Acquiring voltage outputs from transmission solenoid current monitors and gear position Hall-effect sensors. IC Role / Device Role / Timing Role: Single-supply ADC interfaces directly to 3.3 V microcontroller via VDRIVE while accepting 0–2.5 V analog inputs from isolated sensor conditioners. Use Value: 6 mW power at 3 V enables continuous monitoring without thermal throttling in compact TCM housings; shutdown mode extends battery life during vehicle sleep states. |
| Brake-by-Wire Sensor Hub | Electric Power Steering (EPS) Feedback |
Use Scenario: Consolidating redundant brake pedal travel, master cylinder pressure, and wheel speed analog signals onto one acquisition node. IC Role / Device Role / Timing Role: Automotive-qualified ADC provides fault-tolerant, channel-isolated (−85 dB) sampling with sequenced auto-cycling to support ASIL-B diagnostic coverage. Use Value: Channel-to-channel isolation >85 dB prevents crosstalk-induced false fault triggers; 125°C rating permits placement near hydraulic control units. |
Use Scenario: Reading torque sensor bridge outputs and motor phase current sense voltages in EPS motor control feedback path. IC Role / Device Role / Timing Role: High-speed SAR ADC delivers 1 MSPS conversions with sub-ns aperture jitter (50 ps typ), enabling precise field-oriented control loop timing. Use Value: 8.2 MHz full-power bandwidth supports accurate digitization of fast-rising current transients during steering assist events without slew-rate limiting. |
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 |
|---|---|---|---|
| AD7914WYRUZ-REEL7 | 10-bit resolution, 61 dB SINAD min, same pinout/package, identical sequencer and interface logic. | Higher resolution enables finer quantization of low-drift analog signals (e.g., precision temperature sensing) but increases data handling overhead. | Select when system SNR requirements exceed 55 dB and firmware can accommodate 10-bit word length. |
| MAX11131ATC+T | 8-bit, 1 MSPS, 12-lead TDFN, SPI-only interface, no VDRIVE pin, 0.3 LSB INL max, −40°C to +125°C. | Lacks sequencer and dual-range input; requires external MUX or additional GPIO for multi-channel use; smaller footprint but no AGND pin redundancy. | Choose for space-constrained designs where channel count is fixed and sequencer functionality is implemented in host MCU. |
Compared with AD7904WYRUZ-REEL7, AD7914WYRUZ-REEL7 offers higher resolution at identical power and timing, while MAX11131ATC+T trades sequencer flexibility and AGND robustness for compact size - making AD7904WYRUZ-REEL7 optimal for automotive multi-sensor hubs requiring hardware-managed channel cycling and noise immunity.
Availability
AD7904WYRUZ-REEL7 is available at Aetrix Electronics and suitable for automotive engine control units, transmission control modules, brake-by-wire systems, and electric power steering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7904WYRUZ-REEL7 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 and manufacturing expertise spanning over 50 years.
The AD7904/AD7914/AD7924 family was engineered specifically for automotive and industrial data acquisition systems requiring high-speed, low-power, multi-channel SAR conversion with integrated sequencing and AEC-Q100 qualification.
FAQ
What is the maximum sampling rate supported by the AD7904WYRUZ-REEL7?
The AD7904WYRUZ-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK frequency and 16 SCLK cycles per conversion. At lower SCLK frequencies, the throughput scales linearly - e.g., 10 MHz SCLK yields 625 kSPS. This fixed 16-cycle timing eliminates variable latency found in pipelined architectures.
Does the AD7904WYRUZ-REEL7 require an external reference voltage?
Yes, the AD7904WYRUZ-REEL7 requires an external 2.5 V ±1% reference applied to the REFIN pin for guaranteed specifications. The device does not include an internal reference. REFIN impedance is 36 kΩ, so a low-output-impedance reference buffer or precision voltage reference IC (e.g., ADR4525) is recommended to maintain gain accuracy and minimize noise coupling.
How does the sequencer function in the AD7904WYRUZ-REEL7?
The AD7904WYRUZ-REEL7 sequencer is configured via SEQ1/SEQ0 bits in the control register to cycle through VIN0–VIN3 in predefined order (e.g., 0→1→2→3 or 0→2→1→3). Each conversion automatically advances to the next channel without host intervention, reducing CPU load in multi-sensor systems. The channel address is embedded in the DOUT stream for unambiguous data association.
What is the purpose of the VDRIVE pin on the AD7904WYRUZ-REEL7?
The VDRIVE pin sets the logic-level threshold for all digital I/Os (CS, SCLK, DIN, DOUT), independent of AVDD. This allows the AD7904WYRUZ-REEL7 to interface directly with 3 V or 5 V microcontrollers without level shifters - for example, AVDD = 5 V (analog section) and VDRIVE = 3.3 V (digital interface) simultaneously. VINH = 0.7×VDRIVE and VINL = 0.3×VDRIVE define valid logic thresholds.
Is the AD7904WYRUZ-REEL7 suitable for AEC-Q100 automotive applications?
Yes, the AD7904WYRUZ-REEL7 is qualified per AEC-Q100 Grade 1 (−40°C to +125°C), with tested reliability including HTOL, TC, UHAST, and ESD (1.5 kV HBM). Its W-grade suffix denotes automotive qualification, and it features enhanced PSRR (>60 dB up to 100 kHz) and channel-to-channel isolation (−85 dB) for operation in electrically noisy under-hood environments.
AD7904WYRUZ-REEL7 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 ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- -
AD7904WYRUZ-REEL7 FAQ
1.How can I place an order for AD7904WYRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7904WYRUZ-REEL7 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 AD7904WYRUZ-REEL7 reliable?
The price and inventory of AD7904WYRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7904WYRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7904WYRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7904WYRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7904WYRUZ-REEL7?
AD7904WYRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7904WYRUZ-REEL7 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 AD7904WYRUZ-REEL7?
For technical support, including AD7904WYRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7904WYRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7904WYRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7904WYRUZ-REEL7 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 AD7904WYRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7904WYRUZ-REEL7?
All AD7904WYRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7904WYRUZ-REEL7, 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 AD7904WYRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7904WYRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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