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Analog Devices Inc. AD7994BRUZ-1
- Part No.:
- AD7994BRUZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7994BRUZ-1.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
AD7994BRUZ-1 from Analog Devices is a 4-channel, 12-bit successive approximation ADC with I²C-compatible serial interface, 2 µs conversion time, 2.7 V to 5.5 V supply range, and −40°C to +125°C operating temperature. It integrates a 4-channel multiplexer, track-and-hold amplifier, and programmable limit registers for out-of-range alerting in industrial sensor monitoring systems.
For engineers reviewing the AD7994BRUZ-1 datasheet, AD7994BRUZ-1 pinout, AD7994BRUZ-1 application, or AD7994BRUZ-1 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL, I²C high-speed mode support up to 3.4 MHz, open-drain ALERT/BUSY output, pin-selectable addressing via AS, and shutdown current of 1 µA max - all in a 16-lead TSSOP package.
Technical Context
The AD7994BRUZ-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, with address selection via the AS pin enabling up to five devices on one bus.
Conversion control operates in three modes: CONVST-triggered (Mode 1), command-mode writes (Mode 2), or automatic cycle interval (Mode 3). On-chip registers include configuration, conversion result, high/low limit, hysteresis, alert status, and cycle timer - all accessible via I²C with no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonicity and no missing codes across full temperature range. |
| Conversion Time | 2 µs typ - enables sampling at up to 188 kSPS in Mode 2 at 5 V with 3.4 MHz SCL. |
| INL / DNL | ±1 LSB max / +1/–0.9 LSB max - ensures accurate multi-channel measurement without calibration in precision sensor interfaces. |
| SINAD | 70.5 dB min at 10 kHz input - delivers >11.5 effective number of bits (ENOB) for high-fidelity signal capture. |
| Supply Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers and sensors. |
| Shutdown Current | 1 µA max - minimizes system power in battery-operated or energy-constrained applications. |
| I²C Speed | Up to 3.4 MHz (high-speed mode) - reduces data transfer latency and host processor overhead. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and motor control environments. |
Pinout & Package
AD7994BRUZ-1 is housed in a 16-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant, and rated for industrial temperature operation.
| 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. |
| 5 | VDD | Single power supply input (2.7–5.5 V); decoupling capacitor required per datasheet layout guidelines. |
| 6 | REFIN | External reference input (1.2 V to VDD); determines full-scale input range (0 to REFIN) and directly impacts accuracy. |
| 7, 8, 9, 10 | VIN1–VIN4 | Four single-ended analog inputs; each accepts 0 V to REFIN with 30 pF input capacitance and ±1 µA leakage. |
| 11 | AS | Address select logic input - sets I²C slave address to one of three values (GND/VDD/float) per Table 6. |
| 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 - signals out-of-range condition or active conversion; requires external pull-up. |
| 14 | SDA | I²C bidirectional data line - open-drain, requires external pull-up; supports standard/fast/high-speed modes. |
| 15 | SCL | I²C clock input - open-drain compatible, requires external pull-up; timing validated per Table 3. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit SAR ADC with 2 µs conversion | Enables high-throughput, low-latency acquisition in real-time control loops without pipeline delay. |
| I²C high-speed mode (3.4 MHz) | Reduces per-sample transaction time by >70% vs. standard mode, easing host firmware timing constraints. |
| Programmable channel limit registers | Allows autonomous over/under-range detection with interrupt-driven response - eliminates continuous polling. |
| Pin-selectable I²C addressing (AS) | Permits up to five AD7994BRUZ-1 units on one I²C bus without address conflicts or external logic. |
| Auto-shutdown between conversions | Delivers 1 µA max quiescent current in idle state - critical for always-on sensor nodes and low-power IoT endpoints. |
| Wide reference range (1.2 V to VDD) | Supports flexible scaling: use 2.5 V reference for maximum SNR or rail-to-rail reference for simplified supply design. |
Applications
| Industrial Sensor Hub | Automotive Cabin Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of temperature, pressure, humidity, and voltage from multiple analog sensors in a factory floor controller. IC Role / Device Role / Timing Role: 4-channel SAR ADC performing synchronized single-ended sampling with I²C master-initiated reads and ALERT-driven fault reporting. Use Value: Eliminates need for external multiplexer and level-shifting; 12-bit resolution ensures <0.025% FS accuracy across −40°C to +125°C. |
Use Scenario: Cabin air quality monitoring using CO₂, VOC, and ambient light sensors in automotive HVAC modules. IC Role / Device Role / Timing Role: Low-power ADC acquiring four sensor outputs in automatic cycle interval mode with wake-on-alert capability. Use Value: 1 µA shutdown current extends battery backup life; I²C high-speed mode enables rapid diagnostics during ignition cycles. |
| Motor Drive Current Sensing | Smart Energy Metering |
Use Scenario: Isolated phase current sensing in 3-phase inverter drives using shunt resistors and op-amp conditioning stages. IC Role / Device Role / Timing Role: Precision ADC digitizing amplified shunt voltages with programmable high/low limits for overcurrent protection. Use Value: ±1 LSB INL and 70.5 dB SINAD ensure accurate RMS current calculation; ALERT output triggers immediate PWM disable. |
Use Scenario: Multi-point voltage and current sampling in DIN-rail mounted energy meters for residential/commercial billing. IC Role / Device Role / Timing Role: 4-channel ADC interfacing with isolation amplifiers and reference buffers in a Class 0.5 metering front-end. Use Value: 12-bit resolution with guaranteed no missing codes meets IEC 62053-21 linearity requirements; wide VDD range simplifies auxiliary supply design. |
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 |
|---|---|---|---|
| AD7994BRUZ | Same 12-bit performance but supports only standard/fast I²C (≤400 kHz); lacks high-speed mode (3.4 MHz). | Lower throughput in high-SCL-rate systems; suitable where host MCU lacks high-speed I²C support. | Select AD7994BRUZ if system clock budget or MCU peripheral limitations preclude 3.4 MHz SCL operation. |
| ADS1015IDGSR | 12-bit delta-sigma ADC with 3.3 kSPS max; built-in PGA (1–16×); no ALERT output; 10-bit mode available. | Higher noise immunity at low frequencies but lower speed; better for DC/low-frequency sensor signals than dynamic waveforms. | Choose ADS1015IDGSR when oversampling and programmable gain are prioritized over raw speed and autonomous alerting. |
Compared with AD7994BRUZ-1, AD7994BRUZ trades I²C speed for broader MCU compatibility, while ADS1015IDGSR offers integrated gain and noise filtering at the cost of throughput and hardware interrupt capability - making AD7994BRUZ-1 optimal for deterministic, high-speed, alert-driven multi-channel acquisition.
Availability
AD7994BRUZ-1 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive cabin monitoring, motor drive current sensing, smart energy metering, and precision data loggers requiring stable component supply across extended temperature ranges.
Supply support for AD7994BRUZ-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.
The AD7994BRUZ-1 belongs to Analog Devices' precision I²C-compatible ADC product family, designed specifically for space-constrained, low-power, multi-channel data acquisition in harsh industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by the AD7994BRUZ-1?
The AD7994BRUZ-1 supports I²C high-speed mode up to 3.4 MHz when operating in AD7994-1 configuration (AS pin tied to GND or VDD). This is confirmed in Table 3 of the datasheet and enables throughput rates up to 188 kSPS at 5 V. Standard (100 kHz) and fast (400 kHz) modes are also supported for backward compatibility with legacy controllers.
Does the AD7994BRUZ-1 require an external reference voltage?
Yes, the AD7994BRUZ-1 requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and directly defines the full-scale input range (0 V to REFIN). A 0.1 µF and 1 µF capacitor pair is mandatory between REFIN and AGND per Figure 22 in the datasheet to ensure stability and noise immunity.
How does the ALERT/BUSY pin function on the AD7994BRUZ-1?
The ALERT/BUSY pin on the AD7994BRUZ-1 is software-configurable via the configuration register. When set as ALERT, it asserts low (open-drain) when any channel's conversion result exceeds user-programmed high or low limits. When set as BUSY, it asserts low during active conversion. Both modes require an external pull-up resistor and provide hardware interrupt capability without host polling.
Can the AD7994BRUZ-1 operate from a 3.3 V supply?
Yes, the AD7994BRUZ-1 is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. All key parameters - including 12-bit resolution, ±1 LSB INL, 2 µs conversion time, and I²C timing - are guaranteed across this range. Power consumption at 3.3 V is 0.7 mA typ in high-speed mode (3.4 MHz SCL), as shown in Table 2.
What is the purpose of the AS pin on the AD7994BRUZ-1?
The AS (Address Select) pin on the AD7994BRUZ-1 selects one of three I²C slave addresses: grounded (0100011b), tied to VDD (0100100b), or left floating (0100000b). This allows up to five AD7994BRUZ-1 devices to share the same I²C bus without address collision - a key feature for compact multi-sensor nodes where board space and wiring count are constrained.
AD7994BRUZ-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -
AD7994BRUZ-1 FAQ
1.How can I place an order for AD7994BRUZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7994BRUZ-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 AD7994BRUZ-1 reliable?
The price and inventory of AD7994BRUZ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7994BRUZ-1 is usually 5 days.
3.What payment methods are accepted for AD7994BRUZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7994BRUZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7994BRUZ-1?
AD7994BRUZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7994BRUZ-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 AD7994BRUZ-1?
For technical support, including AD7994BRUZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7994BRUZ-1 requirements.
6.How does Aetrix verify that AD7994BRUZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7994BRUZ-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 AD7994BRUZ-1 meets industry standards.
7.What is the process for return or replacement of AD7994BRUZ-1?
All AD7994BRUZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7994BRUZ-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 AD7994BRUZ-1 part is unused and in its original packaging.
Return procedure for AD7994BRUZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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