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Analog Devices Inc. AD7994BRU-0
- Part No.:
- AD7994BRU-0
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7994BRU-0.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,843
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Product details
Overview
AD7994BRU-0 from Analog Devices is a 12-bit, 4-channel, successive approximation analog-to-digital converter with I²C-compatible serial interface, 2 µs conversion time, −40°C to +125°C operating range, and 16-lead TSSOP package. It supports single-ended analog inputs (VIN1–VIN4), external reference (1.2 V to VDD), and out-of-range alert functionality for industrial sensor monitoring systems.
For engineers reviewing the AD7994BRU-0 datasheet, AD7994BRU-0 pinout, AD7994BRU-0 application, or AD7994BRU-0 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply support for high-reliability embedded measurement designs.
Technical Context
The AD7994BRU-0 integrates a 4-channel analog multiplexer, track-and-hold amplifier, and 12-bit SAR core optimized for I²C bus operation up to 3.4 MHz in high-speed mode. Its internal register structure includes configuration, conversion result, high/low limit, alert status, and cycle timer registers - enabling programmable alert thresholds and automatic conversion intervals.
It operates in three distinct modes: CONVST-triggered (Mode 1), command-mode (Mode 2), and automatic cycle interval (Mode 3). The ALERT/BUSY pin is software-configurable as either an out-of-range interrupt or busy indicator, and the AS pin selects among three I²C addresses (0x41, 0x42, or 0x40 when floating).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = REFIN/4096 quantization step, enabling precise voltage measurement in sensor front-ends. |
| Conversion Time | 2 µs typical - allows full 4-channel sequence completion in under 10 µs, supporting real-time control loop sampling. |
| Throughput Rate | 188 kSPS max at 5 V - enables high-speed data acquisition in motor current sensing or power quality monitoring. |
| I²C Interface Modes | Standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) - ensures compatibility with legacy and modern microcontrollers without protocol translation. |
| Operating Voltage | 2.7 V to 5.5 V - supports direct integration into 3.3 V and 5 V systems without level-shifting circuitry. |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and harsh-environment telemetry applications. |
| Shutdown Current | 1 µA max - reduces system standby power in battery-operated condition monitoring nodes. |
Pinout & Package
AD7994BRU-0 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 1 is located at top-left corner adjacent to the notch marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 16 | AGND | Analog ground reference for all internal circuitry; must be connected to low-impedance system AGND plane to minimize noise coupling. |
| 5 | VDD | Main power supply input; decoupling capacitor (0.1 µF ceramic + 10 µF bulk) required near pin for stable ADC operation. |
| 6 | REFIN | External reference input (1.2 V to VDD); determines full-scale range and directly sets LSB size for all channels. |
| 7, 8, 9, 10 | VIN1–VIN4 | Single-ended analog inputs; each accepts 0 V to REFIN range with 30 pF input capacitance and ±1 µA leakage. |
| 11 | AS | Address select logic input; GND/VDD/floating configures I²C address to 0x41/0x42/0x40 - enables up to 5 devices on same bus. |
| 12 | CONVST | Rising-edge triggered wake-up and falling-edge initiated conversion start; requires ≥1 µs high pulse for valid conversion. |
| 13 | ALERT/BUSY | Open-drain configurable output; alerts on out-of-limit conversion results or signals active conversion state. |
| 14 | SDA | I²C bidirectional data line; requires external pull-up resistor (typically 2.2 kΩ to VDD) for proper bus operation. |
| 15 | SCL | I²C clock input; requires external pull-up resistor and supports timing up to 3.4 MHz in high-speed mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable out-of-range alert | Configurable high/low limit registers per channel trigger open-drain ALERT output - eliminates need for external comparator and interrupt logic. |
| Automatic conversion sequencing | Internal sequencer cycles through VIN1–VIN4 without host intervention - reduces firmware overhead in multi-sensor polling. |
| Three operational modes | Hardware-triggered (CONVST), command-driven (I²C write), or autonomous (software-timed interval) - adapts to diverse system timing architectures. |
| Low-power shutdown | 1 µA max quiescent current with automatic entry/exit during idle periods - extends battery life in portable instrumentation. |
| Wide reference flexibility | REFIN accepts 1.2 V to VDD, allowing use of precision references or rail-to-rail buffered supplies - maximizes dynamic range across supply voltages. |
Applications
| Industrial Sensor Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Continuous voltage/current measurement from multiple temperature, pressure, and position sensors in factory automation PLCs. IC Role / Device Role / Timing Role: 4-channel ADC digitizing analog sensor outputs with I²C interface for microcontroller readout; ALERT pin triggers interrupt on overtemperature or overpressure events. Use Value: Eliminates discrete multiplexers and level shifters; 12-bit resolution and −40°C to +125°C rating ensure accuracy and reliability in uncontrolled cabinet environments. | Use Scenario: Cell voltage and pack current sampling in 12 V/48 V automotive battery packs for state-of-charge estimation. IC Role / Device Role / Timing Role: High-accuracy ADC acquiring synchronized measurements across battery cell strings; automatic cycle mode enables deterministic sampling intervals without CPU load. Use Value: 2 µs conversion time and 188 kSPS throughput support fast transient detection; wide VDD range accommodates varying battery voltage during cranking or regeneration. |
| Energy Metering Front-End | Medical Patient Monitoring |
Use Scenario: Simultaneous acquisition of voltage, current, and neutral current in smart electricity meters for harmonic analysis and power quality reporting. IC Role / Device Role / Timing Role: Precision ADC converting isolated analog signals from current transformers and voltage dividers; I²C interface simplifies connection to metering SoC with minimal GPIO usage. Use Value: 70.5 dB SINAD and −79 dB SFDR meet IEC 62053-22 Class 0.5 accuracy requirements; programmable limits detect overvoltage faults before damage occurs. | Use Scenario: Multi-parameter physiological signal acquisition (ECG lead voltages, respiration, skin temperature) in portable patient monitors. IC Role / Device Role / Timing Role: Low-power ADC sampling biopotential signals with integrated alert function for arrhythmia detection; shutdown mode extends device runtime between charges. Use Value: 1 µA shutdown current and 12-bit resolution enable compact, battery-powered designs; 30 pF input capacitance minimizes loading on high-impedance electrode circuits. |
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 |
|---|---|---|---|
| AD7994BRU-1 | Supports I²C high-speed mode up to 3.4 MHz; AD7994BRU-0 limited to 400 kHz. | Required for systems using I²C controllers with >400 kHz clock rates (e.g., ARM Cortex-M7 with fast peripherals). | Select AD7994BRU-1 only if high-speed I²C timing is mandatory; otherwise AD7994BRU-0 offers identical DC accuracy and lower EMI risk at 400 kHz. |
| ADS7953IRHBT | 12-bit, 16-channel, SPI interface; no built-in limit registers or ALERT output; 1.5 µs conversion time. | Suitable for higher channel count or SPI-based systems but lacks I²C compatibility and hardware alerting. | Choose ADS7953IRHBT when expanding beyond 4 channels or integrating with SPI-only MCUs; not drop-in compatible due to interface and pinout differences. |
Compared with AD7994BRU-1, the AD7994BRU-0 trades maximum I²C speed for broader noise immunity and simpler timing compliance; versus ADS7953IRHBT, it provides native I²C connectivity and integrated alert logic at the cost of channel count and SPI flexibility - making AD7994BRU-0 optimal for compact, interrupt-driven 4-sensor systems.
Availability
AD7994BRU-0 is available at Aetrix Electronics and suitable for industrial sensor monitoring, automotive battery management, energy metering front-end, and medical patient monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7994BRU-0 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD799x family was designed specifically for space-constrained, low-power, multi-channel data acquisition systems requiring simple digital interfacing - emphasizing I²C compatibility, integrated alerting, and robust operation across industrial and automotive temperature grades.
FAQ
What is the maximum I²C clock frequency supported by AD7994BRU-0?
The AD7994BRU-0 supports standard (100 kHz) and fast (400 kHz) I²C modes only. Unlike the AD7994BRU-1 variant, it does not support high-speed mode (3.4 MHz). This limitation is specified in the AD7994 datasheet Table 2 and confirmed in the I²C Timing Specifications section (Table 3), where high-speed timing parameters are explicitly marked as applying to AD7994-1 only. Using >400 kHz SCL with AD7994BRU-0 may result in communication failures or invalid conversions.
Does AD7994BRU-0 require an external reference voltage?
Yes, AD7994BRU-0 requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and the datasheet specifies that accuracy and performance metrics (e.g., INL, DNL, SINAD) are guaranteed only when REFIN = 2.5 V. A 0.1 µF ceramic capacitor and 1 µF bulk capacitor must be placed between REFIN and AGND to ensure stable operation and low-noise conversion results.
How many analog input channels does AD7994BRU-0 have, and what type are they?
The AD7994BRU-0 has four single-ended analog input channels: VIN1, VIN2, VIN3, and VIN4. Each accepts a voltage from 0 V to REFIN with ±1 µA input leakage and 30 pF input capacitance. The device does not support differential or pseudo-differential input configurations - all channels are strictly single-ended and share the same reference and ground reference (AGND).
Can AD7994BRU-0 operate from a 3.3 V supply?
Yes, AD7994BRU-0 is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. All electrical characteristics - including 12-bit resolution, 70.5 dB SINAD, 1 µA shutdown current, and I²C timing - are guaranteed across this range. Power consumption at 3.3 V is 0.7 mA typical in high-speed I²C Mode 2, and the REFIN input can be set to 2.5 V or scaled proportionally (e.g., 3.3 V) to maximize dynamic range.
What is the function of the AS pin on AD7994BRU-0?
The AS (Address Select) pin on AD7994BRU-0 configures the device's I²C slave address: tying AS to GND selects address 0x41, tying to VDD selects 0x42, and leaving it floating selects 0x40. This enables up to three AD7994BRU-0 devices on the same I²C bus without address conflict. The AS pin has no effect on conversion performance or analog functionality - it serves exclusively for bus addressing and is sampled at power-up or reset.
AD7994BRU-0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 188k
- Number of Inputs:
- 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:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7994BRU-0 FAQ
1.How can I place an order for AD7994BRU-0 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7994BRU-0 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 AD7994BRU-0 reliable?
The price and inventory of AD7994BRU-0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7994BRU-0 is usually 5 days.
3.What payment methods are accepted for AD7994BRU-0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7994BRU-0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7994BRU-0?
AD7994BRU-0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7994BRU-0 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 AD7994BRU-0?
For technical support, including AD7994BRU-0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7994BRU-0 requirements.
6.How does Aetrix verify that AD7994BRU-0 is sourced from the original manufacturer or authorized distributors?
All AD7994BRU-0 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 AD7994BRU-0 meets industry standards.
7.What is the process for return or replacement of AD7994BRU-0?
All AD7994BRU-0 units undergo pre-shipment inspection (PSI). If there is an issue with AD7994BRU-0, 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 AD7994BRU-0 part is unused and in its original packaging.
Return procedure for AD7994BRU-0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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