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Analog Devices Inc. AD7994BRU-1
- Part No.:
- AD7994BRU-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7994BRU-1.pdf
- Description:
- IC ADC 12BIT 4CHAN I2C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
AD7994BRU-1 from Analog Devices is a 4-channel, 12-bit successive approximation ADC with I²C-compatible serial interface, operating from 2.7 V to 5.5 V supply and delivering 2 µs typical conversion time, 188 kSPS maximum throughput, and −40°C to +125°C industrial temperature range. It integrates a 4-input multiplexer, track-and-hold amplifier, programmable limit registers, and open-drain ALERT/BUSY output - used in precision sensor signal conditioning for industrial process control systems.
For engineers reviewing the AD7994BRU-1 datasheet, AD7994BRU-1 pinout, AD7994BRU-1 application, or AD7994BRU-1 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL, I²C high-speed mode support (up to 3.4 MHz), pin-selectable addressing via AS, out-of-range alert functionality, and 16-lead TSSOP package compatibility with space-constrained embedded measurement nodes.
Technical Context
The AD7994BRU-1 implements a successive approximation register (SAR) architecture with integrated 4:1 analog multiplexer and track-and-hold, supporting single-ended inputs up to 11 MHz full-power bandwidth. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes - enabled by internal oscillator and configurable address selection via AS pin.
Conversion control operates in three distinct modes: CONVST-triggered (Mode 1), command-driven I²C write (Mode 2), or automatic interval timing (Mode 3). On-chip registers include configuration, conversion result, high/low limit, hysteresis, alert status, and cycle timer - enabling autonomous monitoring without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VREFIN/4096 quantization step for high-precision voltage measurement |
| Conversion Time | 2 µs typ - enables rapid sampling of transient analog signals without pipeline latency |
| Throughput Rate | 188 kSPS max @ 5 V, 3.4 MHz SCL - supports real-time closed-loop control at sub-5.3 µs sample intervals |
| I²C Speed Support | Up to 3.4 MHz (high-speed mode) - reduces bus occupancy per conversion, critical for multi-device I²C networks |
| INL / DNL | ±1 LSB max / +1/−0.9 LSB max - ensures monotonicity and accurate end-point linearity across full temperature range |
| Supply Range | 2.7 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains and mixed-voltage system designs |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, motor drive, and industrial ambient environments |
| Shutdown Current | 1 µA max - minimizes quiescent power in battery-backed or energy-harvesting sensor nodes |
Pinout & Package
AD7994BRU-1 is housed in a 16-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and rated for surface-mount reflow soldering per Pb-free 260°C profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 16 | AGND | Analog ground reference - must be star-connected to minimize noise coupling into sensitive analog front-end |
| 5 | VDD | Single 2.7–5.5 V supply - powers digital core, I²C interface, and analog circuitry; requires local 0.1 µF + 1 µF decoupling |
| 6 | REFIN | External reference input (1.2 V to VDD) - sets full-scale range; impedance ~69 kΩ during conversion |
| 7, 8, 9, 10 | VIN1–VIN4 | Four single-ended analog inputs - each accepts 0 V to REFIN; 30 pF input capacitance requires driver buffering above ~10 kHz |
| 11 | AS | Address select logic input - selects one of five I²C addresses (GND/VDD/floating); determines bus scalability |
| 12 | CONVST | Edge-triggered convert start - rising edge powers up device; falling edge initiates conversion after ≥1 µs setup |
| 13 | ALERT/BUSY | Configurable open-drain output - asserts when conversion result exceeds programmed limits (ALERT) or during conversion (BUSY) |
| 14 | SDA | I²C bidirectional data - requires external pull-up; supports standard/fast/high-speed modes with defined timing margins |
| 15 | SCL | I²C clock input - synchronous master-controlled interface; timing validated up to 3.4 MHz with ≤400 pF bus load |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit SAR ADC with 2 µs conversion | Enables high-fidelity acquisition of fast transients while maintaining low power - ideal for vibration or current-sense monitoring |
| Programmable high/low limit registers | Allows autonomous over-range detection without host polling - reduces MCU interrupt load and firmware complexity |
| I²C high-speed mode (3.4 MHz) | Reduces total I²C transaction time to <10 µs per 12-bit read - supports up to five AD7994BRU-1 devices on one bus |
| Pin-selectable I²C addressing (AS) | Eliminates need for external address jumpers or configuration EEPROM - simplifies BOM and layout for multi-channel systems |
| Automatic shutdown between conversions | Draws only 1 µA in idle state - extends battery life in portable diagnostic tools and wireless sensor transmitters |
| Full industrial temperature range | Validated operation from −40°C to +125°C - suitable for deployment in motor controllers, PLC I/O modules, and harsh-environment telemetry |
Applications
| Industrial Process Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Continuous voltage and temperature monitoring of multiple sensors in chemical plant control cabinets exposed to wide thermal swings. IC Role / Device Role / Timing Role: 4-channel ADC digitizing thermocouple, pressure transducer, and current-loop outputs with autonomous ALERT triggering on out-of-spec readings. Use Value: Eliminates need for external comparators and reduces host MCU polling frequency by 70% via programmable limit registers and interrupt-capable ALERT output. |
Use Scenario: Cell voltage sampling in 12S Li-ion battery packs within electric vehicle traction inverters, operating near power electronics heat sources. IC Role / Device Role / Timing Role: Precision 12-bit acquisition of individual cell voltages using external 2.5 V reference, with built-in channel isolation >90 dB preventing cross-talk during switching events. Use Value: Delivers ±1 LSB INL stability across −40°C to +125°C, enabling accurate state-of-charge estimation without calibration drift compensation. |
| Programmable Logic Controller I/O | Energy Metering Front-End |
Use Scenario: Modular analog input card for DIN-rail mounted PLCs requiring hot-swappable, isolated 4–20 mA loop receivers and RTD interfaces. IC Role / Device Role / Timing Role: Simultaneous sampling of four industrial analog signals with I²C interface compatible with ARM-based controller backplane buses. Use Value: Supports 3.4 MHz I²C speed and pin-selectable addressing - allows eight-channel expansion using two AD7994BRU-1 devices on same bus without address conflict. |
Use Scenario: High-accuracy voltage and current sampling in Class 0.2 revenue-grade electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Digitizing conditioned AC waveforms with 70.5 dB SINAD and 71 dB SNR at 10 kHz input, referenced to stable 2.5 V source. Use Value: Meets IEC 62053-22 harmonic distortion requirements (<−78 dB THD) without external filtering, reducing bill-of-materials cost. |
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-0 | Supports only standard (100 kHz) and fast (400 kHz) I²C modes - no high-speed 3.4 MHz capability | Limited to lower-throughput systems where bus bandwidth is not constrained | Select AD7994BRU-0 only if I²C bus speed ≤400 kHz suffices and cost sensitivity outweighs performance headroom |
| ADS1114IDGST | Single-channel, 16-bit delta-sigma ADC with internal 2.048 V reference; no programmable limit registers or ALERT output | Requires external multiplexer and comparator for 4-channel, alert-enabled use cases | Choose ADS1114IDGST only for ultra-high-resolution single-signal measurement where oversampling and internal reference simplify design |
Compared with AD7994BRU-0 and ADS1114IDGST, the AD7994BRU-1 uniquely combines 12-bit precision, 4-channel integration, autonomous alerting, and 3.4 MHz I²C - making it optimal for compact, high-channel-count industrial sensing nodes requiring deterministic response and minimal host overhead.
Availability
AD7994BRU-1 is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, and programmable logic controller I/O requiring stable component supply across extended temperature and long production lifecycles.
Supply support for AD7994BRU-1 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 operations worldwide.
The AD7994BRU-1 belongs to Analog Devices' I²C-compatible precision ADC product family, designed specifically for space-constrained, low-power industrial and automotive sensing applications requiring integrated multiplexing, autonomous monitoring, and robust serial communication.
FAQ
What is the maximum I²C clock frequency supported by the AD7994BRU-1?
The AD7994BRU-1 supports I²C high-speed mode up to 3.4 MHz when operating with ≤100 pF bus capacitance, or 1.7 MHz with ≤400 pF. This capability is exclusive to the "-1" variant (e.g., AD7994BRU-1) and enables faster data reads than the "-0" version. The AD7994BRU-1's timing parameters - including tHIGH, tLOW, and tSU;DAT - are fully characterized and guaranteed for these speeds per Table 3 in the datasheet.
Does the AD7994BRU-1 require an external reference voltage?
Yes, the AD7994BRU-1 requires an external reference applied to the REFIN pin, with a valid range of 1.2 V to VDD. It does not include an internal reference. The reference voltage directly defines the full-scale input range (0 V to REFIN) and impacts absolute accuracy - for example, using a 2.5 V reference yields 610 µV per LSB. A 0.1 µF ceramic capacitor plus 1 µF tantalum capacitor must be placed between REFIN and AGND for stability.
How does the ALERT/BUSY pin function on the AD7994BRU-1?
The ALERT/BUSY pin on the AD7994BRU-1 is software-configurable via the Configuration Register. When set to ALERT mode, it asserts low (open-drain) if any channel's conversion result exceeds user-programmed high or low limits stored in DATAHIGHLIMIT/DATALOWLIMIT registers. In BUSY mode, it asserts low only during active conversion. The pin's behavior is independent of I²C activity and provides hardware-level event notification without host polling.
Can the AD7994BRU-1 operate from a 3.3 V supply?
Yes, the AD7994BRU-1 is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. At 3.3 V, it delivers 121 kSPS throughput in Mode 1 with 3.4 MHz SCL, consumes ≤0.7 mA in active operation, and maintains ±1 LSB INL and 70.5 dB SINAD performance. All logic thresholds (e.g., SDA/SCL VINH = 0.7 × VDD) scale accordingly, ensuring reliable interface timing.
What is the purpose of the AS pin on the AD7994BRU-1?
The AS (Address Select) pin on the AD7994BRU-1 determines the device's 7-bit I²C slave address by setting one of three states: grounded (0100001b), tied to VDD (0100010b), or left floating (0100000b). This enables up to three AD7994BRU-1 devices on the same I²C bus without external address configuration. Combined with the "-1" variant's high-speed mode, five total devices (including AD7993 variants) can share one bus using distinct AS configurations.
AD7994BRU-1 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:
- -
- Input Type:
- -
- Data Interface:
- I2C
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7994BRU-1 FAQ
1.How can I place an order for AD7994BRU-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7994BRU-1 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-1 reliable?
The price and inventory of AD7994BRU-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7994BRU-1 is usually 5 days.
3.What payment methods are accepted for AD7994BRU-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7994BRU-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7994BRU-1?
AD7994BRU-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7994BRU-1 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-1?
For technical support, including AD7994BRU-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7994BRU-1 requirements.
6.How does Aetrix verify that AD7994BRU-1 is sourced from the original manufacturer or authorized distributors?
All AD7994BRU-1 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-1 meets industry standards.
7.What is the process for return or replacement of AD7994BRU-1?
All AD7994BRU-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7994BRU-1, 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-1 part is unused and in its original packaging.
Return procedure for AD7994BRU-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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