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Analog Devices Inc. AD7994BRU-1REEL
- Part No.:
- AD7994BRU-1REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7994BRU-1REEL.pdf
- Description:
- IC ADC 12BIT 4CHAN I2C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
AD7994BRU-1REEL from Analog Devices is a 4-channel, 12-bit successive approximation ADC with I²C-compatible serial interface in 16-lead TSSOP. It delivers 2 µs conversion time, 188 kSPS throughput at 5 V, and operates from 2.7 V to 5.5 V supply across −40°C to +125°C. It supports single-ended analog inputs (VIN1–VIN4), external reference (1.2 V to VDD), and out-of-range alert via open-drain ALERT/BUSY pin - used in industrial sensor data acquisition systems requiring high-resolution, low-power, multi-channel sampling.
For engineers reviewing the AD7994BRU-1REEL datasheet, AD7994BRU-1REEL pinout, AD7994BRU-1REEL application, or AD7994BRU-1REEL equivalent, key selection criteria include its 12-bit resolution with ±1 LSB INL, I²C high-speed mode support (up to 3.4 MHz), sequencer operation, automatic cycle interval mode, and programmable limit registers for real-time threshold monitoring without host intervention.
Technical Context
The AD7994BRU-1REEL implements a 4-channel multiplexer with track-and-hold amplifier capable of handling input frequencies up to 11 MHz. Its conversion logic is triggered either by CONVST pin edge, I²C command write, or software-configured automatic interval mode - enabling flexible integration into resource-constrained microcontroller systems.
It features on-chip configuration, conversion result, alert status, and per-channel high/low limit registers accessible via I²C. The ALERT/BUSY pin serves dual function: as an out-of-range interrupt when limits are violated, or as BUSY indicator during conversion - configurable through register writes without hardware change.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic output and no missing codes across full temperature range. |
| Conversion Time | 2 µs typical - enables rapid sampling for dynamic signal capture in closed-loop control. |
| Throughput Rate | 188 kSPS at 5 V, 3.4 MHz SCL - supports high-speed sensor fusion in compact industrial nodes. |
| INL / DNL | ±1 LSB max / +1/−0.9 LSB max - ensures accurate linearity for precision measurement applications. |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails without level-shifting. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| I²C Modes | Standard (100 kHz), Fast (400 kHz), High Speed (3.4 MHz) - selectable via part variant (−1 suffix). |
Pinout & Package
AD7994BRU-1REEL is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin functions are validated per Analog Devices Rev. 0 datasheet Figure 3 and Table 5.
| 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 | Main power supply input; decoupling capacitor required between VDD and AGND near pin. |
| 6 | REFIN | External reference voltage input (1.2 V to VDD); determines full-scale analog input range (0 to REFIN). |
| 7, 8, 9, 10 | VIN1–VIN4 | Four single-ended analog input channels; each accepts 0 V to REFIN range with 30 pF input capacitance. |
| 11 | AS | Address select logic input - sets one of three I²C addresses (GND/VDD/floating) per Table 6. |
| 12 | CONVST | Edge-triggered convert start - rising edge powers up device; falling edge initiates conversion after ≥1 µs hold. |
| 13 | ALERT/BUSY | Open-drain configurable output - signals out-of-range condition or active conversion state. |
| 14 | SDA | I²C bidirectional data line - requires external pull-up resistor; supports standard/fast/high-speed modes. |
| 15 | SCL | I²C clock input - requires external pull-up resistor; timing compliant per Table 3 for selected mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable limit registers | Per-channel high/low thresholds with hysteresis enable autonomous over/under-range detection and interrupt generation. |
| Three I²C address options | AS pin logic state selects among five possible addresses - allows up to five AD7994BRU-1REEL devices on same bus. |
| Automatic shutdown | Consumes ≤1 µA in power-down mode - ideal for battery-powered remote sensors with periodic wake-up. |
| Flexible conversion control | Supports pin-triggered (CONVST), command-driven (I²C write), and auto-interval modes - simplifies firmware architecture. |
| Reference flexibility | REFIN accepts 1.2 V to VDD - permits use of internal LDO output or precision external reference for optimal SNR. |
Applications
| Industrial Process Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Continuous voltage/current/temperature monitoring across multiple sensors in PLC I/O modules. IC Role / Device Role / Timing Role: 4-channel ADC digitizes analog sensor outputs with synchronized sampling and I²C packetized readout. Use Value: 12-bit resolution and ±1 LSB INL ensure <1% measurement error over full industrial temperature range. |
Use Scenario: Cell voltage and pack temperature sampling in 12 V/48 V EV auxiliary battery systems. IC Role / Device Role / Timing Role: ADC interfaces directly to MCU via I²C; ALERT pin triggers interrupt on cell overvoltage or thermal fault. Use Value: Out-of-range alert function eliminates polling overhead and reduces MCU wake-up frequency by >90%. |
| Smart Building Environmental Sensors | Medical Diagnostic Equipment |
Use Scenario: Multi-sensor node measuring CO₂, humidity, ambient light, and air pressure in HVAC control units. IC Role / Device Role / Timing Role: Single AD7994BRU-1REEL replaces four discrete ADCs; sequencer automates round-robin channel scanning. Use Value: 16-lead TSSOP footprint saves >40% PCB area vs. quad-SOT23 solution while maintaining 12-bit accuracy. |
Use Scenario: Front-end signal conditioning for portable ECG or pulse oximetry devices requiring low-noise analog acquisition. IC Role / Device Role / Timing Role: ADC digitizes conditioned biopotential signals with 70.5 dB SINAD and 71 dB SNR at 10 kHz input. Use Value: 11 MHz full-power bandwidth supports accurate reconstruction of fast transient physiological waveforms. |
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-1 | Same die, RoHS-compliant 16-lead TSSOP (no REEL suffix); identical electrical specs and pinout. | Identical functional use; differs only in packaging format (tape-and-reel vs. tube). | Select AD7994BRUZ-1 for prototyping or low-volume builds where reel handling is unnecessary. |
| ADS1114IDGST | Single-channel, 16-bit delta-sigma ADC with internal reference; I²C interface but no ALERT pin or multi-channel sequencer. | Lacks 4-channel multiplexing and autonomous alert capability - requires external mux and polling logic. | Choose only if 16-bit resolution outweighs channel count and interrupt functionality in cost-sensitive designs. |
Compared with AD7994BRUZ-1, AD7994BRU-1REEL offers identical performance in tape-and-reel form for automated assembly; versus ADS1114IDGST, it provides integrated 4-channel sampling and hardware alerting - reducing BOM count and firmware complexity in multi-sensor systems.
Availability
AD7994BRU-1REEL is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, smart building environmental sensing, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7994BRU-1REEL 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 AD7994BRU-1REEL belongs to the AD799x family of I²C-compatible, multi-channel SAR ADCs designed specifically for space-constrained, low-power industrial and automotive sensor interfaces requiring high accuracy and autonomous monitoring features.
FAQ
What is the maximum I²C clock frequency supported by AD7994BRU-1REEL?
The AD7994BRU-1REEL supports I²C high-speed mode up to 3.4 MHz when operating in the −1 variant configuration (as indicated by the "1" in the part number). This enables 188 kSPS throughput at 5 V supply. Standard (100 kHz) and fast (400 kHz) modes are also supported for backward compatibility with legacy controllers. Timing compliance is verified per Table 3 in the datasheet.
Does AD7994BRU-1REEL require an external reference voltage?
Yes, AD7994BRU-1REEL requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and determines the full-scale analog input range (0 V to REFIN). A 0.1 µF and 1 µF capacitor pair is recommended between REFIN and AGND for noise suppression. No internal reference is provided.
How does the ALERT/BUSY pin function on AD7994BRU-1REEL?
The ALERT/BUSY pin on AD7994BRU-1REEL is software-configurable via internal registers. When set as ALERT, it asserts low (open-drain) if any channel's conversion result exceeds programmed high/low limits. When set as BUSY, it asserts low during active conversion. Both modes eliminate need for polling and reduce host processor load in real-time systems.
Can AD7994BRU-1REEL operate from a 3.3 V supply?
Yes, AD7994BRU-1REEL is fully specified for operation from 2.7 V to 5.5 V. At 3.3 V, it maintains 12-bit resolution, ±1 LSB INL, and 2 µs conversion time. Power consumption in active mode is 0.7 mA typ at 3.4 MHz SCL, and shutdown current remains ≤1 µA - making it suitable for 3.3 V battery-powered applications.
What is the purpose of the AS pin on AD7994BRU-1REEL?
The AS (Address Select) pin on AD7994BRU-1REEL selects one of three I²C slave addresses: grounded (0100001b), tied to VDD (0100010b), or floating (0100000b). This allows up to five AD7994BRU-1REEL devices to share the same I²C bus without address conflict - critical for dense sensor node designs where board space limits discrete addressing solutions.
AD7994BRU-1REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-1REEL FAQ
1.How can I place an order for AD7994BRU-1REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7994BRU-1REEL 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-1REEL reliable?
The price and inventory of AD7994BRU-1REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7994BRU-1REEL is usually 5 days.
3.What payment methods are accepted for AD7994BRU-1REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7994BRU-1REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7994BRU-1REEL?
AD7994BRU-1REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7994BRU-1REEL 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-1REEL?
For technical support, including AD7994BRU-1REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7994BRU-1REEL requirements.
6.How does Aetrix verify that AD7994BRU-1REEL is sourced from the original manufacturer or authorized distributors?
All AD7994BRU-1REEL 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-1REEL meets industry standards.
7.What is the process for return or replacement of AD7994BRU-1REEL?
All AD7994BRU-1REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7994BRU-1REEL, 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-1REEL part is unused and in its original packaging.
Return procedure for AD7994BRU-1REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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