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Analog Devices Inc. AD7991YRJZ-1RL
- Part No.:
- AD7991YRJZ-1RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7991YRJZ-1RL.pdf
- Description:
- IC ADC 12BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,349
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Product details
Overview
AD7991YRJZ-1RL from Analog Devices is a 12-bit, 4-channel 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 track-and-hold for up to 14 MHz input bandwidth-ideal for real-time system monitoring in battery-powered industrial sensors.
For engineers reviewing the AD7991YRJZ-1RL datasheet, AD7991YRJZ-1RL pinout, AD7991YRJZ-1RL application, or AD7991YRJZ-1RL equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL, I²C address flexibility (0x50/0x51), sequencer-controlled multi-channel sampling, shutdown current ≤1 µA, and qualification for automotive-grade reliability under AEC-Q100 stress conditions.
Technical Context
The AD7991YRJZ-1RL implements a SAR architecture with integrated multiplexer and track-and-hold, enabling sequential sampling across four single-ended analog inputs (VIN0–VIN2 plus VIN3/VREF). Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes with clock stretching enabled above 1.7 MHz.
Conversion is command-triggered: each I²C read initiates acquisition and returns result in one transaction. Reference can be derived from VDD (0 V to VDD input range) or externally applied via VIN3/VREF (1.2 V to VDD), supporting flexible signal scaling without external reference ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 distinct output codes for precision measurement of sensor outputs or supply rails. |
| Conversion Time | 1 µs typical - enables ≥950 kSPS effective throughput when using high-speed I²C (3.4 MHz). |
| INL / DNL | ±1 LSB / ±0.9 LSB - ensures monotonicity and <0.025% full-scale linearity error for calibrated systems. |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V microcontroller buses and mixed-voltage designs. |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment deployment. |
| I²C Address | 0x50 or 0x51 - dual-address option allows two AD7991YRJZ-1RL devices on same bus without address conflict. |
| Shutdown Current | 1 µA max - reduces system standby power in battery-critical applications like portable diagnostics. |
Pinout & Package
AD7991YRJZ-1RL is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Digital Input | Serial clock input; requires external pull-up; supports 100 kHz–3.4 MHz I²C timing with defined rise/fall specs. |
| 2 (SDA) | Digital I/O (open-drain) | Bidirectional data line; requires external pull-up; handles I²C start/stop, address, command, and 12-bit result transfer. |
| 3 (VIN0) | Analog Input | Single-ended channel 0 input; 0 V to VREF range; 34 pF acquisition-phase capacitance affects anti-alias filter design. |
| 4 (VIN1) | Analog Input | Single-ended channel 1 input; identical electrical specs to VIN0; enables differential pair measurement with VIN0 if referenced to common AGND. |
| 5 (VIN2) | Analog Input | Single-ended channel 2 input; supports independent voltage monitoring of three system nodes plus reference or fourth sensor. |
| 6 (VIN3/VREF) | Configurable Terminal | Either fourth analog input or external reference input (1.2 V to VDD); determines full-scale range and noise floor scaling. |
| 7 (GND) | Analog Ground | Primary AGND reference for all analog circuitry; must be star-connected to minimize ground bounce in multi-channel reads. |
| 8 (VDD) | Power Supply | Single 2.7–5.5 V supply powering analog core, digital logic, and I²C interface; decoupling capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel sequencer | Automatically cycles through VIN0–VIN3/VREF on consecutive reads-eliminates host MCU polling overhead and simplifies firmware. |
| I²C address select | Two hardware-selectable addresses (0x50/0x51) enable daisy-chaining up to two AD7991YRJZ-1RL on one bus without GPIO or software arbitration. |
| Auto shutdown | Enters 1 µA power-down state between conversions-critical for >1-year battery life in wireless sensor nodes with infrequent sampling. |
| VDD-referenced operation | Uses VDD as default reference, removing need for external precision reference and reducing BOM count in cost-sensitive designs. |
| High-speed I²C mode | 3.4 MHz operation cuts conversion+read latency to ~20 µs-enables closed-loop feedback in motor control or power supply monitoring. |
Applications
| Automotive Battery Monitoring | Industrial Sensor Hub |
|---|---|
Use Scenario: Real-time voltage and temperature tracking of 12 V lead-acid or 48 V Li-ion battery packs in EV auxiliary systems. IC Role / Device Role / Timing Role: 4-channel ADC digitizes cell voltages, pack current shunt, thermistor, and reference rail simultaneously via sequencer mode. Use Value: 12-bit resolution captures <10 mV changes across 0–16 V range; −40°C to +125°C rating ensures operation near engine bay heat sources. |
Use Scenario: Compact environmental sensor node measuring temperature, humidity, pressure, and supply health in factory automation PLCs. IC Role / Device Role / Timing Role: Interfaces four analog sensors directly; I²C bus integration avoids SPI resource contention on constrained microcontrollers. Use Value: 1 µs conversion + sequencer enables full 4-sensor read in <100 µs; 1 µA shutdown extends maintenance interval in sealed enclosures. |
| Portable Medical Diagnostics | Smart Energy Metering |
Use Scenario: Handheld blood glucose or ECG analyzers requiring low-power, high-accuracy analog front-end with minimal PCB area. IC Role / Device Role / Timing Role: Digitizes biosignal amplifier outputs and reference calibration points; operates from coin-cell or rechargeable LiPo. Use Value: SOT-23 footprint saves >50% board space vs. SOIC alternatives; ±1 LSB INL meets IEC 60601-2-27 clinical accuracy requirements. |
Use Scenario: DIN-rail mounted energy monitor capturing phase voltage, current, neutral current, and temperature in commercial buildings. IC Role / Device Role / Timing Role: Simultaneously samples four analog inputs for RMS calculation, harmonic analysis, and thermal derating decisions. Use Value: Channel-to-channel isolation >90 dB prevents crosstalk between high-voltage and current-sense paths; automotive qualification ensures long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7995YRJZ-1RL | 10-bit resolution, ±0.4 LSB INL, lower dynamic performance (61 dB SINAD), same pinout and I²C protocol. | Suitable for cost-sensitive industrial controls where 10-bit resolution suffices (e.g., HVAC zone sensing). | Select when SNR >69 dB and 12-bit code granularity are not required-reduces BOM cost by ~18%. |
| ADS7828IPW | 12-bit, 8-channel, SPI interface only; no I²C support; 2.7–5.25 V supply; −40°C to +85°C temp range. | Requires SPI-capable host and additional level-shifting for 5 V systems; limited to commercial temperature grade. | Choose only if existing design already uses SPI peripherals and does not require automotive temperature range or I²C bus sharing. |
Compared with AD7991YRJZ-1RL, AD7995YRJZ-1RL trades 2-bit resolution for lower cost and power, while ADS7828IPW offers more channels but sacrifices I²C compatibility and extended temperature capability-making AD7991YRJZ-1RL optimal for automotive-qualified, space-constrained, multi-sensor I²C systems demanding 12-bit fidelity.
Availability
AD7991YRJZ-1RL is available at Aetrix Electronics and suitable for automotive battery management, industrial sensor hubs, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7991YRJZ-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 AD7991 belongs to Analog Devices' precision data acquisition portfolio, designed specifically for low-power, multi-channel sensor interfacing in automotive, industrial, and medical applications where small size, I²C simplicity, and AEC-Q100 compliance are critical.
FAQ
What is the maximum I²C clock frequency supported by AD7991YRJZ-1RL?
The AD7991YRJZ-1RL supports high-speed I²C mode up to 3.4 MHz with 100 pF bus capacitance, or 1.7 MHz with 400 pF. At 3.4 MHz, throughput reaches ~175 kSPS with clock stretching enabled. Standard (100 kHz) and fast (400 kHz) modes are also fully compliant per I²C specification. The AD7991YRJZ-1RL automatically adapts timing based on SCL frequency.
Does AD7991YRJZ-1RL require an external reference voltage?
No-AD7991YRJZ-1RL can use VDD as its reference source, providing a 0 V to VDD input range for all four channels. An external reference may be applied to the VIN3/VREF pin (1.2 V to VDD) for improved accuracy or fixed-scale measurements. When VDD is used, the AD7991YRJZ-1RL eliminates need for external reference ICs, reducing system cost and board area.
How does the sequencer mode work on AD7991YRJZ-1RL?
The AD7991YRJZ-1RL sequencer automatically cycles through VIN0 → VIN1 → VIN2 → VIN3/VREF on consecutive I²C read operations. Each read triggers one conversion and returns the corresponding 12-bit result. No configuration register write is needed-sequencing is hardwired. This reduces host firmware complexity and enables deterministic multi-channel sampling without timing jitter from software delays.
Is AD7991YRJZ-1RL qualified for automotive applications?
Yes-AD7991YRJZ-1RL is the Y-version variant, qualified per AEC-Q100 Grade 0 (−40°C to +125°C) and rated for automotive under-hood environments. It features enhanced ESD robustness (1 kV HBM), guaranteed operation over full temperature range, and process controls aligned with automotive quality standards. The "Y" in AD7991YRJZ-1RL explicitly denotes this automotive qualification.
What is the power consumption of AD7991YRJZ-1RL during active conversion?
At VDD = 3.3 V and fSCL = 400 kHz, AD7991YRJZ-1RL draws 0.09 mA during fully operational ADC and interface activity. At 3.4 MHz, current rises to 0.25 mA. In shutdown with inactive interface, it consumes just 1 µA-making it suitable for wake-on-event architectures. Power dissipation remains below 1.4 mW at 5.5 V, minimizing thermal impact in dense layouts.
AD7991YRJZ-1RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- 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:
- -
AD7991YRJZ-1RL FAQ
1.How can I place an order for AD7991YRJZ-1RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7991YRJZ-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 AD7991YRJZ-1RL reliable?
The price and inventory of AD7991YRJZ-1RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7991YRJZ-1RL is usually 5 days.
3.What payment methods are accepted for AD7991YRJZ-1RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7991YRJZ-1RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7991YRJZ-1RL?
AD7991YRJZ-1RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7991YRJZ-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 AD7991YRJZ-1RL?
For technical support, including AD7991YRJZ-1RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7991YRJZ-1RL requirements.
6.How does Aetrix verify that AD7991YRJZ-1RL is sourced from the original manufacturer or authorized distributors?
All AD7991YRJZ-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 AD7991YRJZ-1RL meets industry standards.
7.What is the process for return or replacement of AD7991YRJZ-1RL?
All AD7991YRJZ-1RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7991YRJZ-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 AD7991YRJZ-1RL part is unused and in its original packaging.
Return procedure for AD7991YRJZ-1RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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