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Analog Devices Inc. AD7999WYRJZ-1RL
- Part No.:
- AD7999WYRJZ-1RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7999WYRJZ-1RL.pdf
- Description:
- IC ADC 8BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AD7999WYRJZ-1RL from Analog Devices is a 4-channel, 8-bit successive approximation ADC with I²C-compatible serial interface in an 8-lead SOT-23 package. It operates from 2.7 V to 5.5 V, delivers 1 µs conversion time, supports −40°C to +125°C automotive temperature range, and uses internal or external reference via VIN3/VREF pin for analog input ranges of 0 V to VDD or 0 V to VREF - deployed in battery-powered system monitoring and medical instrument front-ends.
For engineers reviewing the AD7999WYRJZ-1RL datasheet, AD7999WYRJZ-1RL pinout, AD7999WYRJZ-1RL application, or AD7999WYRJZ-1RL equivalent, key selection criteria include its 8-bit resolution, 4-channel single-ended configuration, I²C address (0101001b), shutdown current ≤1 µA, and automotive-grade qualification per AEC-Q100 - all verified in Rev. C datasheet Tables 4 and 7.
Technical Context
The AD7999WYRJZ-1RL implements a SAR architecture with integrated track-and-hold and 4:1 analog multiplexer, enabling sampling up to 14 MHz full-power bandwidth. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (1.7–3.4 MHz) modes with clock stretching above 400 kHz.
Conversion is command-triggered: each I²C read initiates acquisition and returns result. The device defaults to shutdown mode, powering up only during conversions - reducing average current to ≤1 µA in inactive state while maintaining 1 µs typical conversion time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - provides 256 discrete output codes for cost-sensitive, moderate-accuracy sensing applications. |
| Conversion Time | 1 µs typical - enables up to ~95 kSPS throughput at 3.4 MHz SCL with clock stretching, suitable for real-time system monitoring. |
| Analog Input Channels | 4 single-ended inputs (VIN0–VIN2 + VIN3/VREF) - allows simultaneous voltage monitoring across multiple sensors or rails without external MUX. |
| I²C Address | 0101001b (7-bit) - fixed address for AD7999-1 variant, enabling coexistence with other I²C devices on same bus without address conflict. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic systems, eliminating need for level-shifting in mixed-voltage designs. |
| Shutdown Current | 1 µA maximum at VDD = 3.3 V - extends battery life in portable equipment by minimizing quiescent power between measurements. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment embedded applications. |
Pinout & Package
AD7999WYRJZ-1RL is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Digital input | Serial clock line - requires external pull-up; supports I²C standard/fast/high-speed modes with defined tHIGH/tLOW timing per Table 5. |
| 2 (SDA) | Digital I/O (open-drain) | Bidirectional data line - requires external pull-up; handles command writes and conversion result reads over I²C protocol. |
| 3 (VIN0) | Analog input | Channel 0 single-ended input - referenced to GND, range 0 V to VREF; 34 pF input capacitance during acquisition phase. |
| 4 (VIN1) | Analog input | Channel 1 single-ended input - identical electrical specs to VIN0; enables multi-rail voltage logging without external signal conditioning. |
| 5 (VIN2) | Analog input | Channel 2 single-ended input - matches VIN0/VIN1 performance; supports sequencer-driven round-robin sampling across all four channels. |
| 6 (VIN3/VREF) | Configurable terminal | Either Channel 3 analog input or external reference input - when used as VREF, sets full-scale range for all channels (0 V to VREF). |
| 7 (GND) | Analog ground | Primary AGND reference - all analog signals and internal circuitry referenced here; must be low-impedance connection to avoid noise coupling. |
| 8 (VDD) | Power supply | Single 2.7–5.5 V supply - powers analog core, digital interface, and internal reference; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel single-ended input with sequencer | Enables automatic round-robin sampling across VIN0–VIN3/VREF without host MCU intervention - reduces firmware overhead in data acquisition systems. |
| I²C-compatible interface (standard/fast/high-speed) | Eliminates need for dedicated SPI lines or GPIO bit-banging; supports up to 3.4 MHz SCL for >90 kSPS effective throughput in high-speed mode. |
| Reference flexibility (VDD-derived or external) | Allows system-level optimization: use VDD for widest dynamic range (0–VDD), or external precision reference for improved absolute accuracy and channel matching. |
| Automated shutdown between conversions | Reduces average supply current to sub-microamp levels during idle periods - critical for energy-constrained battery-powered sensor nodes. |
| Automotive qualification (−40°C to +125°C) | Validated for AEC-Q100 stress testing - ensures reliability in engine control units, battery management systems, and ADAS subsystems. |
Applications
| Battery Management Monitoring | Medical Vital Sign Acquisition |
|---|---|
|
Use Scenario: Real-time measurement of cell voltages, pack temperature, and charge/discharge current in portable medical devices and e-bikes. IC Role / Device Role / Timing Role: 8-bit ADC digitizes analog sensor outputs at ~10 kSPS; I²C interface enables direct connection to low-pin-count microcontrollers. Use Value: Low 1 µA shutdown current extends operational runtime; 4-channel capability eliminates external multiplexer, reducing BOM count and PCB area. |
Use Scenario: Front-end signal conditioning for non-invasive blood pressure, pulse oximetry, or ECG lead-off detection in handheld diagnostic tools. IC Role / Device Role / Timing Role: Converts analog bio-sensor outputs into digital values with 1 µs conversion latency; sequencer automates multi-sensor polling. Use Value: Automotive-grade temperature range ensures stable operation during clinical use; 8-bit resolution meets SNR requirements for basic physiological parameter estimation. |
| Industrial PLC Analog Input Module | Automotive Cabin Environment Sensing |
|
Use Scenario: Monitoring of 4× 0–10 V or 4–20 mA loop signals from pressure, flow, and temperature transmitters in factory automation. IC Role / Device Role / Timing Role: Acts as local ADC node on I²C backplane; VIN3/VREF accepts external 2.5 V reference for consistent scaling across channels. Use Value: Channel-to-channel isolation >90 dB prevents crosstalk between high-voltage industrial inputs; SOT-23 footprint simplifies layout in space-constrained DIN-rail modules. |
Use Scenario: Cabin air quality (CO₂, VOC), humidity, and ambient light sensing in automotive infotainment and climate control systems. IC Role / Device Role / Timing Role: Digitizes outputs from MEMS-based environmental sensors; operates continuously within −40°C to +125°C junction temperature limits. Use Value: Qualified for automotive use per AEC-Q100; 4-channel integration supports multi-sensor fusion without additional ICs or routing complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7998BRUZ-REEL7 | 12-bit, 8-channel, same SOT-23-8 package, but higher power (0.83 mW @ 3.3 V/3.4 MHz) and no automotive temp grade. | Used where higher resolution and more inputs are needed, but not qualified for −40°C to +125°C operation. | Select AD7998BRUZ-REEL7 only if 12-bit resolution and 8 inputs outweigh need for automotive qualification and ultra-low shutdown current. |
| MCP3221A0T-E/OT | 12-bit, single-channel, SOT-23-6, I²C interface, 2.7–5.5 V supply, but lacks sequencer and multi-input capability. | Suitable for point-sensing applications; requires external multiplexing for >1 channel, increasing design complexity. | Choose MCP3221A0T-E/OT only for single-sensor systems where board space is tighter than 8-lead SOT-23 and 12-bit resolution is mandatory. |
Compared with AD7998BRUZ-REEL7 and MCP3221A0T-E/OT, AD7999WYRJZ-1RL uniquely balances 4-channel integration, automotive temperature range, sub-µA shutdown, and I²C simplicity - making it optimal for compact, battery-aware, and thermally demanding embedded monitoring.
Availability
AD7999WYRJZ-1RL is available at Aetrix Electronics and suitable for battery-powered systems, medical instruments, and automotive cabin sensing requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for AD7999WYRJZ-1RL 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 R&D and manufacturing facilities worldwide.
The AD799x family - including AD7999WYRJZ-1RL - was designed specifically for low-power, multi-channel system monitoring in space-constrained and thermally demanding environments such as automotive ECUs and portable medical devices.
FAQ
What is the I²C address of AD7999WYRJZ-1RL?
The AD7999WYRJZ-1RL has a fixed 7-bit I²C address of 0101001b (0x51 hex), as confirmed in Table 8 of the Rev. C datasheet. This address is hardwired and cannot be changed via pins or registers, distinguishing it from AD7991/AD7995 variants that offer dual-address versions.
Does AD7999WYRJZ-1RL support external reference input?
Yes, AD7999WYRJZ-1RL supports external reference input via the VIN3/VREF pin. When configured as VREF, it sets the full-scale range for all four analog inputs (0 V to VREF), enabling improved accuracy and channel matching versus VDD-referenced operation - validated in Table 4 and Figure 7 of the datasheet.
What is the maximum sample rate achievable with AD7999WYRJZ-1RL?
The AD7999WYRJZ-1RL achieves up to ~95 kSPS effective throughput when operating at 3.4 MHz SCL with clock stretching enabled, based on the formula "17.5 × (1/fSCL) + 2 µs" in Table 4. At 400 kHz SCL (no clock stretching), throughput drops to ~18 kSPS - both values confirmed in the Throughput Rate specification section.
Is AD7999WYRJZ-1RL qualified for automotive applications?
Yes, AD7999WYRJZ-1RL is explicitly qualified for automotive use, with a specified operating temperature range of −40°C to +125°C (Y version) and compliance with AEC-Q100 stress testing requirements - stated in the General Description, Product Highlights, and Absolute Maximum Ratings sections of the Rev. C datasheet.
How does the sequencer function work on AD7999WYRJZ-1RL?
The AD7999WYRJZ-1RL sequencer automatically cycles through all four analog inputs (VIN0–VIN3/VREF) in order during consecutive I²C read operations. Each read triggers one conversion on the next channel in sequence - eliminating need for repeated register writes and simplifying firmware for multi-channel acquisition, as detailed in the Mode of Operation section.
AD7999WYRJZ-1RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 140k
- Number of Inputs:
- 3, 4
- Input Type:
- Single Ended
- Data Interface:
- I2C
- 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 ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- -
AD7999WYRJZ-1RL FAQ
1.How can I place an order for AD7999WYRJZ-1RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7999WYRJZ-1RL 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 AD7999WYRJZ-1RL reliable?
The price and inventory of AD7999WYRJZ-1RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7999WYRJZ-1RL is usually 5 days.
3.What payment methods are accepted for AD7999WYRJZ-1RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7999WYRJZ-1RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7999WYRJZ-1RL?
AD7999WYRJZ-1RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7999WYRJZ-1RL 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 AD7999WYRJZ-1RL?
For technical support, including AD7999WYRJZ-1RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7999WYRJZ-1RL requirements.
6.How does Aetrix verify that AD7999WYRJZ-1RL is sourced from the original manufacturer or authorized distributors?
All AD7999WYRJZ-1RL 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 AD7999WYRJZ-1RL meets industry standards.
7.What is the process for return or replacement of AD7999WYRJZ-1RL?
All AD7999WYRJZ-1RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7999WYRJZ-1RL, 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 AD7999WYRJZ-1RL part is unused and in its original packaging.
Return procedure for AD7999WYRJZ-1RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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