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Analog Devices Inc. AD7998BRUZ-1REEL
- Part No.:
- AD7998BRUZ-1REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7998BRUZ-1REEL.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,038
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Product details
Overview
AD7998BRUZ-1REEL from Analog Devices is a 12-bit, 8-channel successive approximation ADC with I²C-compatible interface, 2 µs conversion time, 2.7–5.5 V supply range, and −40°C to +85°C operation. It integrates an 8:1 analog multiplexer, track-and-hold amplifier, and programmable limit registers, serving as a system-level analog front-end for sensor monitoring in industrial control and data acquisition.
For engineers reviewing the AD7998BRUZ-1REEL datasheet, AD7998BRUZ-1REEL pinout, AD7998BRUZ-1REEL application, or AD7998BRUZ-1REEL equivalent, key selection considerations include its 12-bit resolution, I²C high-speed mode support (up to 3.4 MHz), out-of-range ALERT output, pin-selectable addressing (AS), and 20-lead TSSOP package compatibility with space-constrained PCB layouts.
Technical Context
The AD7998BRUZ-1REEL implements a successive approximation register (SAR) architecture with integrated 8:1 multiplexer and track-and-hold, supporting up to 11 MHz full-power analog input bandwidth. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes-enabled only on the "-1" variant, confirmed by the suffix "BRUZ-1REEL" and datasheet Table 6.
Conversion is initiated via CONVST edge trigger, I²C command write, or automatic cycle timer; power management includes shutdown current ≤1 µA and dynamic current scaling across operating modes. On-chip registers store conversion results, high/low limits, hysteresis, and alert status-enabling autonomous over-range detection without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = REFIN/4096 quantization step, enabling precise measurement of low-amplitude sensor signals. |
| Conversion Time | 2 µs typical - enables sampling at up to 188 kSPS in Mode 2 at 5 V, suitable for real-time transient capture. |
| Analog Input Channels | 8 single-ended - supports simultaneous monitoring of multiple sensors (e.g., temperature, pressure, voltage rails) without external MUX. |
| I²C Interface Modes | Standard, Fast, and High Speed (up to 3.4 MHz) - reduces bus occupancy and improves system throughput vs. slower ADCs. |
| Supply Voltage Range | 2.7 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains and battery-powered systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and motor control cabinets. |
| Shutdown Current | ≤1 µA max - minimizes quiescent power in sleep-mode systems such as remote IoT nodes or portable instrumentation. |
Pinout & Package
AD7998BRUZ-1REEL is housed in a 20-lead, 0.65 mm pitch TSSOP package (JEDEC MO-153), with exposed pad not electrically connected. Pin functions are validated per Analog Devices Rev. 0 datasheet Figure 3 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 20 | AGND | Analog ground reference - must be star-connected to minimize noise coupling into sensitive analog inputs VIN1–VIN8. |
| 2, 5 | VDD | Power supply input - requires local 0.1 µF + 10 µF decoupling; powers digital and analog sections from single rail. |
| 6 | REFIN | External reference input - accepts 1.2 V to VDD; sets full-scale range (0 V to REFIN); requires 0.1 µF + 1 µF bypassing to AGND. |
| 7–14 | VIN1–VIN8 | Single-ended analog inputs - each independently selectable via internal sequencer; input capacitance 30 pF, leakage ±1 µA. |
| 15 | AS | Address select - configures I²C address (0x21, 0x22, 0x23, 0x24, or 0x20 if floating); enables up to five devices on same bus. |
| 16 | CONVST | Edge-triggered convert start - rising edge powers up device; falling edge initiates conversion after ≥1 µs setup. |
| 17 | ALERT/BUSY | Open-drain configurable output - asserts when conversion result exceeds programmed limits (ALERT) or during conversion (BUSY). |
| 18 | SDA | I²C bidirectional data - open-drain; requires external pull-up; supports clock stretching and multi-master arbitration. |
| 19 | SCL | I²C clock input - open-drain; timing compliant with high-speed mode (tHIGH min = 60 ns @ CB = 100 pF). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable out-of-range detection | Configurable high/low limit registers per channel (CH1–CH4) drive ALERT output as hardware interrupt-eliminates polling overhead. |
| Three I²C addressing options | AS pin selects among five distinct addresses (0x20–0x24), allowing up to five AD7998BRUZ-1REEL units on one bus without address conflict. |
| Autonomous conversion sequencing | Internal sequencer cycles through all 8 channels in software-defined order; no host intervention required between conversions. |
| Low-noise analog front-end | Channel-to-channel isolation >90 dB and aperture jitter 50 ps typ ensure accurate multi-channel sampling without crosstalk-induced error. |
| Flexible power management | Three operational modes (CONVST-triggered, command, auto-cycle) plus shutdown (<1 µA) enable optimal trade-off between latency, throughput, and power. |
Applications
| Industrial Sensor Hub | Smart Energy Metering |
|---|---|
Use Scenario: Monitoring 8 analog sensor outputs (RTDs, thermocouples, current shunts) in a PLC I/O module with isolated field-side interface. IC Role / Device Role / Timing Role: Primary 12-bit analog front-end digitizing conditioned sensor signals; synchronized via I²C host controller with <2 µs latency per channel. Use Value: Eliminates need for external multiplexer and reference buffer; 12-bit resolution meets Class 0.5 metering accuracy requirements per IEC 62053-21. |
Use Scenario: Measuring phase voltages, currents, and neutral current in a 3-phase residential energy meter with tamper detection. IC Role / Device Role / Timing Role: Simultaneous sampling of 6 voltage/current channels (via external gain stages) and 2 auxiliary inputs (temperature, supply monitor). Use Value: Programmable ALERT output triggers immediate MCU interrupt on overvoltage or overcurrent events-enabling sub-cycle fault response. |
| Automated Test Equipment (ATE) | Condition Monitoring Node |
Use Scenario: Low-cost benchtop multichannel DAQ for production line functional testing of power supplies and motor drives. IC Role / Device Role / Timing Role: High-throughput analog acquisition engine interfaced to microcontroller via I²C; configured in auto-cycle mode for continuous streaming. Use Value: 188 kSPS maximum throughput at 5 V allows 23.5 kSPS per channel across 8 inputs-sufficient for 10 kHz signal analysis per channel. |
Use Scenario: Wireless vibration and temperature node mounted on rotating machinery, powered by energy harvesting. IC Role / Device Role / Timing Role: Low-power analog acquisition subsystem that wakes periodically to sample accelerometer and thermistor outputs. Use Value: Shutdown current ≤1 µA extends battery life; ALERT output wakes host MCU only on threshold violation-reducing average system power by >90%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7997BRUZ-1REEL | 10-bit resolution, identical pinout/package, same I²C interface and feature set-including AS pin, ALERT/BUSY, and sequencer. | Lower resolution suits cost-sensitive applications where 10-bit (≈0.1% FS) accuracy suffices, e.g., basic voltage monitoring or HVAC controls. | Select AD7997BRUZ-1REEL when SNR >61 dB and INL <±0.5 LSB are not required; retains full software/hardware compatibility. |
| ADS1115IDGSR | 16-bit delta-sigma ADC, 4-channel (expandable to 8 via external MUX), programmable gain amplifier (PGA), but no built-in sequencer or ALERT output. | Higher resolution benefits precision weigh scales or strain gauge bridges; lacks autonomous limit detection and requires external sequencing logic. | Choose ADS1115IDGSR only when 16-bit resolution and PGA flexibility outweigh loss of integrated 8-channel operation and hardware ALERT interrupt. |
Compared with AD7997BRUZ-1REEL, AD7998BRUZ-1REEL provides 2 extra bits of resolution and 9 dB higher SINAD-critical for noise-sensitive sensor interfaces-while ADS1115IDGSR trades integration for resolution and gain flexibility, requiring additional components to match AD7998BRUZ-1REEL's autonomous 8-channel capability.
Availability
AD7998BRUZ-1REEL is available at Aetrix Electronics and suitable for industrial sensor hubs, smart energy metering, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7998BRUZ-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 AD7998BRUZ-1REEL belongs to Analog Devices' precision I²C-compatible ADC product family, designed specifically for space-constrained, low-power, multi-sensor data acquisition systems in industrial and instrumentation applications.
FAQ
What is the maximum I²C clock frequency supported by AD7998BRUZ-1REEL?
The AD7998BRUZ-1REEL supports I²C high-speed mode up to 3.4 MHz when the AS pin is tied to VDD or AGND (confirming -1 variant), as specified in datasheet Table 3 and ordering guide. This enables faster register reads and reduced bus contention versus standard (100 kHz) or fast (400 kHz) modes. Operation above 3.4 MHz is not guaranteed and may cause communication errors. The AD7998BRUZ-1REEL must be used with appropriate bus capacitance (≤100 pF) and pull-up strength to meet timing parameters t1–t12.
Does AD7998BRUZ-1REEL require an external reference voltage?
Yes, AD7998BRUZ-1REEL requires an external reference applied to the REFIN pin, with voltage range 1.2 V to VDD. The reference directly defines the full-scale input range (0 V to REFIN), so accuracy and stability of the external reference directly impact ADC absolute accuracy. A 0.1 µF ceramic capacitor and 1 µF tantalum capacitor must be placed between REFIN and AGND per datasheet recommendations. The AD7998BRUZ-1REEL does not include an internal reference; using VDD as reference is possible but degrades accuracy due to supply noise and drift.
How many I²C addresses can be assigned to AD7998BRUZ-1REEL?
The AD7998BRUZ-1REEL supports five unique I²C addresses via the AS pin: 0x20 (AS floating), 0x21 (AS = AGND), 0x22 (AS = VDD), 0x23 (AS = AGND on -1 variant), and 0x24 (AS = VDD on -1 variant), as defined in datasheet Table 6. This allows up to five AD7998BRUZ-1REEL devices-or a mix of AD7997/AD7998 variants-to share the same I²C bus without address collision, simplifying multi-node sensor network design.
What is the function of the ALERT/BUSY pin on AD7998BRUZ-1REEL?
The ALERT/BUSY pin on AD7998BRUZ-1REEL is a dual-function, open-drain output configurable via internal registers. When set as ALERT, it asserts low when any enabled channel's conversion result exceeds user-programmed high or low limits-acting as a hardware interrupt. When set as BUSY, it asserts low during conversion and releases upon result availability. This eliminates polling and enables deterministic timing in real-time systems. The AD7998BRUZ-1REEL's ALERT function operates autonomously without host CPU involvement.
Can AD7998BRUZ-1REEL perform continuous conversions without host intervention?
Yes, AD7998BRUZ-1REEL supports automatic cycle interval mode (Mode 3), where the internal cycle timer triggers conversions at software-defined intervals without external CONVST pulses or I²C commands. In this mode, the device sequences through all enabled channels continuously, stores results in the conversion result register, and optionally asserts ALERT on limit violations-all while the I²C interface remains inactive. This reduces host MCU load and is ideal for battery-powered or event-driven monitoring applications using the AD7998BRUZ-1REEL.
AD7998BRUZ-1REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 188k
- Number of Inputs:
- 8
- 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 ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7998BRUZ-1REEL FAQ
1.How can I place an order for AD7998BRUZ-1REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7998BRUZ-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 AD7998BRUZ-1REEL reliable?
The price and inventory of AD7998BRUZ-1REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7998BRUZ-1REEL is usually 5 days.
3.What payment methods are accepted for AD7998BRUZ-1REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7998BRUZ-1REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7998BRUZ-1REEL?
AD7998BRUZ-1REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7998BRUZ-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 AD7998BRUZ-1REEL?
For technical support, including AD7998BRUZ-1REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7998BRUZ-1REEL requirements.
6.How does Aetrix verify that AD7998BRUZ-1REEL is sourced from the original manufacturer or authorized distributors?
All AD7998BRUZ-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 AD7998BRUZ-1REEL meets industry standards.
7.What is the process for return or replacement of AD7998BRUZ-1REEL?
All AD7998BRUZ-1REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7998BRUZ-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 AD7998BRUZ-1REEL part is unused and in its original packaging.
Return procedure for AD7998BRUZ-1REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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