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Analog Devices Inc. AD7908WYRUZ-REEL7
- Part No.:
- AD7908WYRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7908WYRUZ-REEL7.pdf
- Description:
- IC ADC 8BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
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Product details
Overview
AD7908WYRUZ-REEL7 from Analog Devices is an 8-bit, 1 MSPS, 8-channel successive approximation ADC with integrated channel sequencer, single-supply operation (2.7 V to 5.25 V), and SPI-compatible serial interface. It features 0.5 μA max shutdown current, 6 mW max power at 3 V/1 MSPS, and 20-lead TSSOP packaging qualified for automotive applications.
For engineers reviewing the AD7908WYRUZ-REEL7 datasheet, AD7908WYRUZ-REEL7 pinout, AD7908WYRUZ-REEL7 application, or AD7908WYRUZ-REEL7 equivalent, key selection criteria include its 8-bit resolution, 1 MSPS throughput, sequenced single-ended input architecture, VDRIVE logic-level independence, and automotive-grade temperature range (−40°C to +125°C).
Technical Context
The AD7908WYRUZ-REEL7 implements a track-and-hold amplifier with 8.2 MHz full-power bandwidth and 50 ps typ aperture jitter, enabling accurate sampling of high-frequency analog signals up to 50 kHz while maintaining ≥48.5 dB SINAD. Its conversion is initiated on the falling edge of CS with no pipeline delay, and timing is fully controlled by the external SCLK (up to 20 MHz).
It uses a 16-cycle SCLK-driven conversion cycle, supports flexible input ranges (0 V to REFIN or 0 V to 2 × REFIN via RANGE bit), and allows output coding selection (straight binary or twos complement) via the CODING bit in its control register - all configurable without external components.
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 fast transients in motor control or sensor monitoring systems. |
| SINAD | 48.5 dB min at 50 kHz - ensures usable dynamic range for medium-fidelity signal acquisition. |
| Power Dissipation | 6 mW max at 3 V/1 MSPS - supports battery-powered or thermally constrained embedded designs. |
| Shutdown Current | 0.5 μA max - enables ultra-low-power sleep modes in portable or automotive ECUs. |
| Input Channels | 8 single-ended - reduces external multiplexer count and PCB area in multi-sensor systems. |
| Operating Temp | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive use. |
Pinout & Package
AD7908WYRUZ-REEL7 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 layout follows standard Analog Devices 20-lead TSSOP footprint, compatible with automated assembly and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Master clock for both data transfer and internal conversion timing; accepts 10 kHz–20 MHz signals with 40/60 duty cycle tolerance. |
| DIN (Pin 2) | Data input | Accepts 8-bit control register writes (ADDR2–ADDR0, SEQ, SHADOW, RANGE, CODING) on SCLK falling edge. |
| CS (Pin 3) | Chip select | Active-low signal that initiates sampling on falling edge and frames SPI communication window. |
| AGND (Pins 4, 8, 17, 20) | Analog ground | Common reference for all analog inputs, REFIN, and internal circuitry; must be low-impedance and separated from DGND. |
| AVDD (Pins 5, 6) | Analog supply | Single 2.7 V–5.25 V rail powering analog core; AVDD ≥ 4.75 V required for 0 V to 2×REFIN input range. |
| REFIN (Pin 7) | Reference input | Accepts 2.5 V ±1% external reference; impedance ~36 kΩ at 1 MSPS; determines full-scale voltage range. |
| VIN0–VIN7 (Pins 9–16) | Analog inputs | Eight single-ended channels; unused pins must be tied to AGND to prevent noise coupling and crosstalk. |
| DOUT (Pin 18) | Data output | 3-wire SPI output: 1 leading zero + 3 address bits + 8 data bits + 4 trailing zeros (MSB first, straight binary default). |
| VDRIVE (Pin 19) | Logic supply | Independent 2.7 V–5.25 V rail setting digital I/O voltage levels - decouples interface logic from AVDD for mixed-voltage systems. |
Key Features
| Feature | Design Value |
|---|---|
| Channel sequencer | Programmable 8-channel scan order via control register - eliminates host CPU polling overhead in multi-sensor acquisition. |
| VDRIVE interface isolation | Separate logic supply enables direct connection to 3 V or 5 V microcontrollers regardless of AVDD - simplifies level-shifting in mixed-rail designs. |
| No pipeline delay | Deterministic conversion start on CS falling edge with fixed 800 ns max conversion time - enables precise time-critical sampling synchronization. |
| Automotive qualification | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C) with automotive-specific SINAD/SNR validation - suitable for engine control, ADAS sensor hubs, and body electronics. |
| Flexible input range | Selectable 0 V to REFIN (straight binary) or 0 V to 2×REFIN (twos complement) via RANGE bit - supports unipolar and bipolar-referenced signal conditioning. |
Applications
| Motor Control Feedback | Automotive Sensor Hub |
|---|---|
Use Scenario: Real-time sampling of current shunt voltages, position encoder outputs, and temperature sensors in BLDC motor drives. IC Role / Device Role / Timing Role: 8-channel ADC acquiring synchronized analog feedback signals at ≤1 MSPS for closed-loop PWM control loop execution. Use Value: Sequencer eliminates software overhead; 1 MSPS throughput supports 20 kHz control loops; automotive temp rating ensures reliability in engine bay environments. | Use Scenario: Consolidating cabin air quality (CO₂, humidity), tire pressure, and ambient light measurements in vehicle body control modules. IC Role / Device Role / Timing Role: Centralized analog front-end converting multiple low-bandwidth sensor outputs with minimal MCU intervention. Use Value: Single 20-lead TSSOP replaces discrete mux + ADC solutions; 0.5 μA shutdown current extends battery life in always-on monitoring modes. |
| Industrial PLC Input Module | Medical Patient Monitor |
Use Scenario: Digitizing 4–20 mA current loop signals, thermocouple outputs, and voltage-based process variables in factory automation I/O cards. IC Role / Device Role / Timing Role: High-accuracy, multi-channel acquisition stage with programmable gain support via external op-amp front-end. Use Value: 8.2 MHz input bandwidth accommodates anti-aliasing filter design; ±0.2 LSB INL ensures <0.1% measurement linearity over industrial temperature range. | Use Scenario: Capturing ECG lead voltages, SpO₂ photodiode currents, and respiration belt signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power, isolated analog-to-digital converter interfacing with precision instrumentation amplifiers and anti-alias filters. Use Value: 48.5 dB SINAD at 50 kHz meets IEC 60601-2-27 requirements for diagnostic-grade ECG; 6 mW max power enables extended battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7918WYRUZ-REEL7 | 10-bit resolution, 61 dB min SINAD at 50 kHz, same pinout/package, identical timing and interface. | Higher-resolution sensing where 8-bit quantization noise limits diagnostic accuracy or control precision. | Select when system SNR budget requires >50 dB and additional code density improves control loop stability. |
| ADS8320IDR | 16-bit, 100 kSPS, SPI interface, SOIC-8 package, no integrated sequencer, higher power (12 mW at 5 V). | High-precision, lower-speed applications requiring <0.0015% LSB step size, e.g., laboratory instrumentation calibration. | Choose only if resolution priority outweighs speed, channel count, and power constraints - not a drop-in replacement. |
Compared with AD7918WYRUZ-REEL7, the AD7908WYRUZ-REEL7 trades resolution for lower cost and reduced data processing load; versus ADS8320IDR, it delivers 10× faster sampling with integrated sequencing but at lower absolute precision - making it optimal for real-time embedded control rather than static measurement.
Availability
AD7908WYRUZ-REEL7 is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC input modules, and portable medical device production requiring stable component supply and long-term lifecycle assurance.
Supply support for AD7908WYRUZ-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 Wilmington, MA.
The AD7908WYRUZ-REEL7 belongs to the AD7908/AD7918/AD7928 family - designed specifically for space-constrained, power-sensitive, multi-channel data acquisition in automotive, industrial, and medical systems requiring guaranteed performance across extended temperature ranges.
FAQ
What is the maximum sample rate supported by the AD7908WYRUZ-REEL7?
The AD7908WYRUZ-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16-cycle conversion timing. At this rate, the device consumes 6 mW max when powered from a 3 V supply, and conversion time is fixed at 800 ns. Lower sample rates reduce power consumption via auto shutdown mode.
Does the AD7908WYRUZ-REEL7 require an external reference voltage?
Yes, the AD7908WYRUZ-REEL7 requires an external reference applied to the REFIN pin. The datasheet specifies 2.5 V ±1% for guaranteed performance, with REFIN input impedance of ~36 kΩ at 1 MSPS. The device supports two input ranges: 0 V to REFIN (straight binary) or 0 V to 2×REFIN (twos complement), selected via the RANGE bit in the control register.
Is the AD7908WYRUZ-REEL7 pin-compatible with other members of the AD7908/AD7918/AD7928 family?
Yes, the AD7908WYRUZ-REEL7 is fully pin-compatible with AD7918WYRUZ-REEL7 and AD7928WYRUZ-REEL7 in the 20-lead TSSOP package. All share identical pin configuration, timing, serial interface protocol, and control register structure - differing only in resolution (8-/10-/12-bit) and associated AC/DC performance specifications.
What is the purpose of the VDRIVE pin on the AD7908WYRUZ-REEL7?
The VDRIVE pin on the AD7908WYRUZ-REEL7 sets the logic voltage level for all digital I/Os (CS, SCLK, DIN, DOUT), independent of AVDD. This allows direct interfacing with 3 V or 5 V microcontrollers without level shifters - for example, AVDD = 3.3 V for analog section while VDRIVE = 5 V for legacy 5 V SPI peripherals, or vice versa.
How does the channel sequencer function in the AD7908WYRUZ-REEL7?
The AD7908WYRUZ-REEL7's channel sequencer is configured via the SEQ and SHADOW bits in the control register. When enabled, it automatically cycles through a preprogrammed sequence of up to eight VIN0–VIN7 channels, initiating conversions without host intervention. Each result includes 3 address bits in the DOUT stream to identify the source channel, reducing firmware complexity in multi-sensor systems.
AD7908WYRUZ-REEL7 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 ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- -
AD7908WYRUZ-REEL7 FAQ
1.How can I place an order for AD7908WYRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7908WYRUZ-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 AD7908WYRUZ-REEL7 reliable?
The price and inventory of AD7908WYRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7908WYRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7908WYRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7908WYRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7908WYRUZ-REEL7?
AD7908WYRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7908WYRUZ-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 AD7908WYRUZ-REEL7?
For technical support, including AD7908WYRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7908WYRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7908WYRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7908WYRUZ-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 AD7908WYRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7908WYRUZ-REEL7?
All AD7908WYRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7908WYRUZ-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 AD7908WYRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7908WYRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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