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Analog Devices Inc. AD7999YRJZ-1RL
- Part No.:
- AD7999YRJZ-1RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7999YRJZ-1RL.pdf
- Description:
- IC ADC 8BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,323
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Product details
Overview
AD7999YRJZ-1RL from Analog Devices is a 8-bit, 4-channel successive approximation analog-to-digital converter with I²C-compatible serial interface, operating from 2.7 V to 5.5 V supply, delivering 1 µs typical conversion time and −40°C to +125°C automotive-grade temperature range. It supports sequencer operation, automatic shutdown (1 µA max), and accepts internal (VDD) or external reference via VIN3/VREF pin for system monitoring in battery-powered instrumentation.
For engineers reviewing the AD7999YRJZ-1RL datasheet, AD7999YRJZ-1RL pinout, AD7999YRJZ-1RL application, or AD7999YRJZ-1RL equivalent, key selection considerations include its 8-bit resolution, SOT-23-8 package, I²C address 0x51 (0101001), 14 MHz full-power bandwidth, and guaranteed no-missed-codes performance across automotive temperature range.
Technical Context
The AD7999YRJZ-1RL integrates a 4-channel analog multiplexer, track-and-hold amplifier, and SAR ADC core with on-chip control logic fully synchronized to an I²C bus. Its sequencer mode enables automatic channel cycling without host intervention, while clock stretching support at >400 kHz SCL ensures reliable data capture under high-speed I²C conditions.
It uses straight binary coding, supports standard/fast/high-speed I²C modes (up to 3.4 MHz), and derives reference either from VDD (0 V to VDD input range) or externally applied voltage (1.2 V to VDD) on VIN3/VREF - enabling flexible dynamic range trade-offs in compact sensor interface designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 distinct output codes; sufficient for basic sensor digitization and status monitoring where high precision is not required. |
| Conversion Time | 1 µs typical - enables sampling rates up to ~95 kSPS under high-speed I²C (1.71 MHz SCL), suitable for fast transient detection. |
| Analog Input Channels | 4 single-ended inputs (VIN0–VIN2 + VIN3/VREF) - allows simultaneous monitoring of multiple sensors or system nodes in space-constrained layouts. |
| I²C Address | 0x51 (0101001) - fixed address for AD7999-1 variant; eliminates address conflict when multiple AD7999 devices share same bus. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V microcontroller systems without level-shifting circuitry. |
| Operating Temperature | −40°C to +125°C - qualified for automotive under-hood and industrial harsh-environment applications per AEC-Q100 stress requirements. |
| Shutdown Current | 1 µA maximum - reduces system standby power significantly; ideal for battery-operated devices requiring long quiescent life. |
Pinout & Package
AD7999YRJZ-1RL is housed in an 8-lead SOT-23 package (2.9 mm × 1.6 mm × 1.1 mm height), optimized for high-density PCB layouts and automated assembly. The package is RoHS-compliant and rated for reflow soldering at 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Digital Input | Serial clock line for I²C interface; requires external pull-up resistor; supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. |
| SDA | Digital I/O (open-drain) | Bidirectional data line; open-drain structure mandates external pull-up; handles command writes and conversion result reads over I²C. |
| VIN0–VIN2 | Analog Inputs | Three dedicated single-ended analog inputs; each accepts 0 V to VREF range; sampled sequentially or individually via I²C register access. |
| VIN3/VREF | Configurable Terminal | Fourth analog input OR external reference input (1.2 V to VDD); dual function enables flexible reference sourcing without extra pins. |
| VDD | Power Supply | Main supply input (2.7–5.5 V); also serves as default reference source when VIN3/VREF is used as analog input. |
| GND | Analog Ground | Common reference for all analog circuitry; must be connected to low-noise system ground plane to maintain DC accuracy and channel isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown with wake-on-read | Enters 1 µA shutdown between conversions; wakes automatically on I²C read - eliminates need for explicit power management commands. |
| Internal sequencer | Automatically cycles through enabled channels without host CPU intervention - reduces firmware overhead in multi-sensor polling loops. |
| Channel-to-channel isolation | −90 dB at 10 kHz - prevents crosstalk between VIN0–VIN2 during simultaneous acquisition, critical for mixed-signal integrity. |
| Full-power bandwidth | 14 MHz @ 3 dB - supports accurate digitization of fast-rising signals such as motor current transients or switch-mode power supply ripple. |
| Guaranteed no-missed-codes | Validated across full 8-bit range at −40°C to +125°C - ensures monotonicity and deterministic behavior in safety-critical monitoring applications. |
Applications
| Automotive Battery Monitoring | Industrial Sensor Hub |
|---|---|
Use Scenario: Real-time voltage and temperature sampling across 12 V battery terminals and auxiliary cells in start-stop vehicles. IC Role / Device Role / Timing Role: 4-channel ADC digitizes battery voltage, alternator output, cabin temp, and coolant temp; I²C interface synchronizes readings with MCU scheduler. Use Value: Enables predictive battery health analysis using correlated multi-parameter data, with 1 µs conversion ensuring minimal latency in fault response. | Use Scenario: Compact environmental sensing node collecting pressure, humidity, vibration, and ambient light in factory automation equipment. IC Role / Device Role / Timing Role: Acts as primary analog front-end; VIN0–VIN2 acquire sensor outputs, VIN3/VREF accepts external reference for ratiometric accuracy. Use Value: SOT-23-8 footprint minimizes board area; −40°C to +125°C rating ensures reliability inside sealed enclosures near motors or drives. |
| Portable Medical Device | Smart Energy Metering |
Use Scenario: Low-power glucose meter or pulse oximeter requiring battery voltage supervision and analog sensor signal conditioning. IC Role / Device Role / Timing Role: Monitors battery level (VIN0), photodiode current (VIN1), IR LED drive feedback (VIN2), and reference stability (VIN3/VREF). Use Value: 1 µA shutdown current extends disposable device shelf life; 8-bit resolution meets clinical accuracy thresholds for trend-based diagnostics. | Use Scenario: Secondary measurement path in residential energy meters tracking auxiliary loads (e.g., solar inverter output, EV charger current). IC Role / Device Role / Timing Role: Digitizes isolated current shunt and voltage divider outputs; communicates results via I²C to main metrology IC for calibration offset correction. Use Value: Channel-to-channel isolation (>90 dB) prevents interference between high-side and low-side measurements, improving overall kWh accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7991YRJZ-1RL | 12-bit resolution, higher INL (±1 LSB), SINAD 70 dB - trades speed for precision. | Better suited for high-accuracy sensor calibration where 8-bit quantization noise is unacceptable. | Select AD7991YRJZ-1RL when absolute accuracy and SNR > 70 dB are mandatory; accept higher cost and identical SOT-23 footprint. |
| ADS7822U | 8-bit, SPI interface, 200 kSPS, 2.7–5.25 V supply - faster throughput but incompatible bus protocol. | Requires MCU with SPI peripheral and additional GPIO for CS; no built-in sequencer or auto-wake. | Choose ADS7822U only if existing design uses SPI infrastructure and needs >95 kSPS; verify layout changes for different pinout and decoupling. |
Compared with AD7999YRJZ-1RL, AD7991YRJZ-1RL provides higher resolution at the cost of reduced noise immunity and higher power in active mode, while ADS7822U offers greater speed but demands SPI hardware support and forfeits I²C system integration benefits.
Availability
AD7999YRJZ-1RL is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial sensor hubs, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7999YRJZ-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.
The AD799x family was designed specifically for space-constrained, low-power, multi-channel data acquisition in automotive and industrial systems - prioritizing I²C integration, wide temperature operation, and robust channel isolation.
FAQ
What is the I²C address of AD7999YRJZ-1RL?
The AD7999YRJZ-1RL uses a fixed 7-bit I²C address of 0x51 (binary 0101001). This address is hardwired and cannot be changed via pins or registers, distinguishing it from AD7991/AD7995 variants that offer two address options. When connecting multiple AD7999YRJZ-1RL devices on the same bus, address collision must be avoided through physical bus segmentation or software arbitration.
Does AD7999YRJZ-1RL support external reference voltage?
Yes, AD7999YRJZ-1RL supports external reference voltage applied to the VIN3/VREF pin within 1.2 V to VDD. When used this way, the analog input range becomes 0 V to VREF instead of 0 V to VDD, enabling improved resolution for low-voltage sensor signals. The device maintains specified INL and DNL performance across this range, and the reference input impedance is 69 kΩ with 5 pF capacitance outside conversion phase.
What is the maximum sampling rate achievable with AD7999YRJZ-1RL?
The AD7999YRJZ-1RL achieves up to ~95 kSPS under high-speed I²C (1.71 MHz SCL) with clock stretching enabled. At lower SCL frequencies (e.g., 400 kHz), throughput drops to ~22.5 kSPS due to longer I²C transaction overhead. The 1 µs conversion time is fixed, but total cycle time depends on I²C bus timing, register access mode, and whether sequencer or single-channel reads are used.
How does the sequencer mode work on AD7999YRJZ-1RL?
The sequencer mode in AD7999YRJZ-1RL automatically cycles through enabled analog input channels (VIN0–VIN2 and/or VIN3/VREF) upon each I²C read operation, eliminating the need for repeated configuration writes. Channel enable/disable is controlled via the Configuration Register (address 0x01), and the sequence order follows pin numbering. This reduces host MCU firmware complexity and improves deterministic sampling timing in real-time monitoring applications.
Is AD7999YRJZ-1RL qualified for automotive applications?
Yes, the Y version of AD7999YRJZ-1RL is explicitly qualified for automotive applications, with guaranteed operation from −40°C to +125°C and compliance to AEC-Q100 stress test requirements. Its SOT-23-8 package is rated for reflow at 260°C, and the device includes ESD protection (1 kV HBM). Full parametric specifications - including INL, DNL, and channel isolation - are validated across this extended temperature range.
AD7999YRJZ-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:
- -
- Qualification:
- -
AD7999YRJZ-1RL FAQ
1.How can I place an order for AD7999YRJZ-1RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7999YRJZ-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 AD7999YRJZ-1RL reliable?
The price and inventory of AD7999YRJZ-1RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7999YRJZ-1RL is usually 5 days.
3.What payment methods are accepted for AD7999YRJZ-1RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7999YRJZ-1RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7999YRJZ-1RL?
AD7999YRJZ-1RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7999YRJZ-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 AD7999YRJZ-1RL?
For technical support, including AD7999YRJZ-1RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7999YRJZ-1RL requirements.
6.How does Aetrix verify that AD7999YRJZ-1RL is sourced from the original manufacturer or authorized distributors?
All AD7999YRJZ-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 AD7999YRJZ-1RL meets industry standards.
7.What is the process for return or replacement of AD7999YRJZ-1RL?
All AD7999YRJZ-1RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7999YRJZ-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 AD7999YRJZ-1RL part is unused and in its original packaging.
Return procedure for AD7999YRJZ-1RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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