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Analog Devices Inc. AD7991YRJZ-0RL
- Part No.:
- AD7991YRJZ-0RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7991YRJZ-0RL.pdf
- Description:
- IC ADC 12BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
AD7991YRJZ-0RL 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, achieves 1 µs conversion time, supports −40°C to +125°C automotive temperature range, and uses internal track-and-hold with multiplexer for simultaneous channel sequencing-ideal for compact battery-powered system monitoring.
For engineers reviewing the AD7991YRJZ-0RL datasheet, AD7991YRJZ-0RL pinout, AD7991YRJZ-0RL application, or AD7991YRJZ-0RL equivalent, key selection criteria include its 12-bit resolution with ±1 LSB INL, I²C address flexibility (0x50/0x51), shutdown current ≤1 µA, VIN3/VREF dual-role terminal, and guaranteed no missing codes across full scale.
Technical Context
The AD7991YRJZ-0RL implements a SAR architecture with integrated track-and-hold and 4:1 analog multiplexer, enabling sequential sampling of four single-ended inputs or three inputs plus external reference. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (up to 3.4 MHz) modes with clock stretching above 1.7 MHz.
Conversion is command-triggered via I²C read operations; the device remains in automatic shutdown between conversions. Reference can be derived internally from VDD (0 V to VDD input range) or externally applied to VIN3/VREF (1.2 V to VDD), with 69 kΩ input impedance and 35 pF capacitance during conversion phase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 distinct output codes with guaranteed no missing codes. |
| Conversion Time | 1 µs typical - enables up to ~95 kSPS throughput at 3.4 MHz SCL with clock stretching. |
| INL / DNL | ±1 LSB / ±0.9 LSB - ensures monotonicity and accurate end-point linearity for precision sensing. |
| Supply Range | 2.7 V to 5.5 V - compatible with common industrial and automotive rails without level-shifting. |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive and harsh-environment industrial use. |
| I²C Address | 0x50 (AD7991-0) - fixed address variant enabling multi-drop bus configuration with AD7991-1 (0x51). |
| Shutdown Current | 1 µA max - minimizes quiescent power in always-on monitoring systems with periodic wake-up. |
Pinout & Package
AD7991YRJZ-0RL 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 for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Digital Input | Serial clock line; requires external pull-up; supports 100 kHz–3.4 MHz I²C timing with defined tHIGH/tLOW. |
| 2 (SDA) | Digital I/O (Open-Drain) | Bidirectional data line; open-drain output with 0.4 V VOL @ 3 mA sink; needs external pull-up. |
| 3 (VIN0) | Analog Input | Single-ended channel 0 input; 0 V to VREF range; 34 pF acquisition-phase capacitance. |
| 4 (VIN1) | Analog Input | Single-ended channel 1 input; identical specs to VIN0; supports sequenced multi-channel reads. |
| 5 (VIN2) | Analog Input | Single-ended channel 2 input; same leakage (±1 µA) and capacitance profile as VIN0–VIN1. |
| 6 (VIN3/VREF) | Configurable Terminal | Either channel 3 analog input or external reference source (1.2 V–VDD); 69 kΩ input impedance. |
| 7 (GND) | Analog Ground | Primary AGND reference for all analog circuitry; must be star-connected to minimize noise coupling. |
| 8 (VDD) | Power Supply | Single 2.7–5.5 V supply powering both analog core and digital interface; decoupling required. |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel SAR ADC | Enables compact multi-sensor monitoring (e.g., voltage, temperature, current) without external MUX. |
| I²C interface with dual addresses | Allows two AD7991YRJZ-0RL devices on one bus (0x50 + 0x51), reducing GPIO count in space-constrained designs. |
| Auto shutdown mode | Reduces average current to µA-level between conversions-critical for battery life in portable medical instruments. |
| VIN3/VREF dual-function pin | Eliminates need for external reference buffer when using VDD as reference; simplifies BOM and layout. |
| Automotive qualification | Meets AEC-Q100 stress test requirements for Grade 1 (−40°C to +125°C), supporting under-dash ECUs. |
Applications
| System Monitoring | Battery-Powered Systems |
|---|---|
|
Use Scenario: Real-time voltage, temperature, and current monitoring in industrial PLC backplanes. IC Role / Device Role / Timing Role: 4-channel ADC digitizing sensor outputs at ≤95 kSPS with I²C burst reads for firmware-triggered diagnostics. Use Value: Single-chip solution replaces discrete ADC + I²C interface + reference, cutting PCB area by >40% vs. alternative solutions. |
Use Scenario: Low-power data logging in handheld diagnostic tools with coin-cell or Li-ion supply. IC Role / Device Role / Timing Role: Periodic wake-up ADC sampling (e.g., every 10 s) with 1 µA shutdown current preserving battery runtime. Use Value: 12-bit resolution maintains accuracy across 0–3.3 V battery discharge curve without recalibration. |
| Data Acquisition | Medical Instruments |
|
Use Scenario: Portable ECG front-end acquiring lead voltages and auxiliary biopotentials. IC Role / Device Role / Timing Role: Simultaneous sampling of 4 electrodes with <1 µs inter-channel skew enabled by internal T/H and sequencer. Use Value: Channel-to-channel isolation >90 dB prevents crosstalk-induced artifact in differential biosignal processing. |
Use Scenario: Vital sign monitor measuring SpO₂, NIBP, and temperature in point-of-care devices. IC Role / Device Role / Timing Role: High-accuracy analog front-end digitizing calibrated sensor outputs with ±1 LSB INL traceability. Use Value: Automotive-grade temp range ensures stable performance during sterilization cycles and field deployment. |
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-0RL | 10-bit resolution, ±0.4 LSB INL, lower THD (−85 dB), same pinout/package/I²C interface. | Lower cost for non-critical measurements where 12-bit precision is unnecessary (e.g., HVAC status sensing). | Select when SNR >61 dB suffices and BOM cost reduction is prioritized over resolution headroom. |
| ADS7828IDRCT | 12-bit SAR, SPI interface only, 50 kSPS max, 8-pin VSSOP, no auto shutdown (250 µA idle). | Requires MCU SPI peripheral and additional GPIOs; unsuitable for I²C-only host architectures. | Choose only if existing design uses SPI and board space allows larger VSSOP; not drop-in for AD7991YRJZ-0RL. |
Compared with AD7991YRJZ-0RL, AD7995YRJZ-0RL trades 2 bits of resolution for lower cost and improved THD, while ADS7828IDRCT sacrifices I²C compatibility and ultra-low shutdown current for marginally higher throughput-neither offers pin-for-pin replacement without interface or power architecture changes.
Availability
AD7991YRJZ-0RL is available at Aetrix Electronics and suitable for system monitoring, battery-powered instrumentation, and medical data acquisition requiring stable component supply across automotive and industrial temperature ranges.
Supply support for AD7991YRJZ-0RL 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 AD7991YRJZ-0RL belongs to the AD799x family of low-power, multi-channel I²C ADCs designed specifically for space-constrained, low-quiescent-power applications in automotive, industrial, and portable medical systems.
FAQ
What is the I²C address of AD7991YRJZ-0RL?
The AD7991YRJZ-0RL is the "-0" variant and uses a fixed 7-bit I²C address of 0x50 (1010000b). This allows coexistence with AD7991YRJZ-1RL (0x51) on the same bus. Address selection is hardwired-no external pins or registers configure it. The device responds only to this address during read/write transactions, ensuring deterministic communication in multi-device systems.
Does AD7991YRJZ-0RL require an external reference voltage?
No, AD7991YRJZ-0RL does not require an external reference. It supports internal reference derivation from VDD, enabling a 0 V to VDD analog input range. Alternatively, an external reference (1.2 V to VDD) may be applied to the VIN3/VREF pin. When using VDD as reference, the part achieves full-scale linearity without added components-reducing BOM count and layout complexity in cost-sensitive designs.
How does the sequencer function work in AD7991YRJZ-0RL?
The AD7991YRJZ-0RL sequencer automatically cycles through up to four analog inputs (VIN0–VIN3/VREF) upon each I²C read command. No register writes are needed to configure channel order-the default sequence is VIN0 → VIN1 → VIN2 → VIN3/VREF. Conversion results are returned in sequence over the I²C bus, enabling efficient burst reads without host-side channel management overhead.
What is the maximum sampling rate achievable with AD7991YRJZ-0RL?
The AD7991YRJZ-0RL achieves up to ~95 kSPS when operating at 3.4 MHz SCL with clock stretching enabled. Throughput is calculated as 17.5 × (1/fSCL) + 2 µs per conversion. At 400 kHz SCL (standard/fast mode), throughput drops to ~18 kSPS. The 1 µs conversion time is fixed; actual sample rate depends entirely on I²C bus speed and protocol overhead-not ADC core limitations.
Is AD7991YRJZ-0RL suitable for automotive applications?
Yes, AD7991YRJZ-0RL is explicitly qualified for automotive applications. Its Y-grade rating covers −40°C to +125°C operation, and it meets AEC-Q100 reliability standards. Key features supporting automotive use include robust ESD tolerance (1 kV HBM), wide VDD range (2.7 V–5.5 V) accommodating battery transients, and guaranteed performance across temperature extremes-making it appropriate for engine control, body electronics, and ADAS subsystems.
AD7991YRJZ-0RL 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:
- 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-0RL FAQ
1.How can I place an order for AD7991YRJZ-0RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7991YRJZ-0RL 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-0RL reliable?
The price and inventory of AD7991YRJZ-0RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7991YRJZ-0RL is usually 5 days.
3.What payment methods are accepted for AD7991YRJZ-0RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7991YRJZ-0RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7991YRJZ-0RL?
AD7991YRJZ-0RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7991YRJZ-0RL 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-0RL?
For technical support, including AD7991YRJZ-0RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7991YRJZ-0RL requirements.
6.How does Aetrix verify that AD7991YRJZ-0RL is sourced from the original manufacturer or authorized distributors?
All AD7991YRJZ-0RL 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-0RL meets industry standards.
7.What is the process for return or replacement of AD7991YRJZ-0RL?
All AD7991YRJZ-0RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7991YRJZ-0RL, 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-0RL part is unused and in its original packaging.
Return procedure for AD7991YRJZ-0RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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