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Analog Devices Inc. AD7997BRUZ-1REEL
- Part No.:
- AD7997BRUZ-1REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7997BRUZ-1REEL.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,419
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Product details
Overview
AD7997BRUZ-1REEL from Analog Devices is a 10-bit, 8-channel 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 +85°C operating temperature. It integrates an 8:1 analog multiplexer, track-and-hold amplifier, and out-of-range alert function for industrial sensor monitoring systems.
For engineers reviewing the AD7997BRUZ-1REEL datasheet, AD7997BRUZ-1REEL pinout, AD7997BRUZ-1REEL application, or AD7997BRUZ-1REEL equivalent, key selection considerations include I²C high-speed mode support (3.4 MHz), pin-selectable addressing (AS input), 1 µA shutdown current, REFIN voltage range (1.2 V to VDD), and single-supply operation without external reference buffer.
Technical Context
The AD7997BRUZ-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 operates in standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes-enabled by AS pin configuration and internal oscillator synchronization.
Conversion control supports three modes: CONVST-triggered (Mode 1), command-mode writes (Mode 2), and automatic cycle interval (Mode 3). On-chip limit registers (DATAHIGHLIMIT/DATALOWLIMIT) and open-drain ALERT/BUSY output enable hardware interrupt-driven threshold monitoring without host polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - guarantees monotonic transfer function and no missing codes over full temperature range |
| Conversion Time | 2 µs typical - enables minimum 121 kSPS throughput at 3.4 MHz I²C clock in Mode 1 |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct connection to common logic rails (3.3 V or 5 V) without level shifters |
| Reference Input Range | 1.2 V to VDD - allows flexible external reference selection including rail-to-rail buffered sources |
| I²C Speed Support | Up to 3.4 MHz (high-speed mode) - reduces data read latency and improves system-level sampling efficiency |
| Shutdown Current | 1 µA maximum at 3 V - enables ultra-low-power operation during idle intervals in battery-powered sensors |
| Channel Count | 8 single-ended inputs - eliminates need for external multiplexing circuitry in multi-sensor front ends |
Pinout & Package
AD7997BRUZ-1REEL is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices Rev. 0 datasheet Figure 3 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pins 1,3,4,20) | Analog Ground Reference | Low-impedance return path for all analog circuitry; must be separated from digital ground and tied at single point |
| VDD (Pins 2,5) | Power Supply Input | Single 2.7–5.5 V supply powers analog core, digital logic, and I²C interface simultaneously |
| REFIN (Pin 6) | External Reference Input | Accepts 1.2–VDD reference voltage; requires 0.1 µF + 1 µF decoupling to AGND for noise immunity |
| VIN1–VIN8 (Pins 7,8,9,10,11,12,13,14) | Analog Input Channels | Eight single-ended inputs, each with 30 pF input capacitance and ±1 µA leakage; 0–REFIN range |
| AS (Pin 15) | Address Select Logic Input | Configures one of five I²C addresses (0100000–0100100 binary); float = 0100000, AGND = low, VDD = high |
| CONVST (Pin 16) | Convert Start Trigger | Rising edge powers up device (1 µs delay); falling edge initiates conversion and places T/H into hold mode |
| ALERT/BUSY (Pin 17) | Open-Drain Status Output | Configurable as out-of-range interrupt (per limit registers) or BUSY indicator during conversion |
| SDA (Pin 18) | I²C Bidirectional Data | Open-drain I/O requiring external pull-up; supports standard/fast/high-speed I²C protocols |
| SCL (Pin 19) | I²C Clock Input | Open-drain input requiring external pull-up; timing compliant with I²C specification up to 3.4 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Fast 2 µs SAR conversion | Enables real-time response in closed-loop control systems with minimal latency between sampling and processing |
| I²C high-speed mode (3.4 MHz) | Reduces total conversion+read time to <10 µs per channel, improving effective sampling rate in multi-channel sequences |
| Programmable out-of-range alert | Hardware interrupt generation via ALERT/BUSY pin eliminates CPU polling overhead in condition-monitoring applications |
| Pin-selectable I²C addressing | Allows up to five AD7997BRUZ-1REEL devices on same bus without address conflicts or software reconfiguration |
| Automatic shutdown between conversions | Minimizes average power consumption in intermittent sensing applications while maintaining fast wake-up capability |
Applications
| Industrial Sensor Hub | Smart Energy Metering |
|---|---|
Use Scenario: Simultaneous acquisition of temperature, pressure, humidity, and current-sense signals in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Central 8-channel analog front-end digitizing multiple transducer outputs with synchronized sampling and I²C burst reads. Use Value: Eliminates discrete multiplexers and reference buffers, reducing BOM count and PCB area while supporting 121 kSPS aggregate throughput at 3.4 MHz I²C. |
Use Scenario: Monitoring phase voltages, neutral current, and auxiliary sensor inputs in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Low-power, isolated analog acquisition node interfacing to metrology SoC via I²C, operating continuously under 5 V supply. Use Value: 1 µA shutdown current extends battery backup life; REFIN range (1.2–5.5 V) accommodates precision shunt-based current measurement references. |
| Automotive Cabin Monitoring | Medical Patient Vital Signs |
Use Scenario: Cabin air quality sensing using CO₂, NOₓ, and particulate matter analog outputs in automotive HVAC control units. IC Role / Device Role / Timing Role: Multi-sensor signal conditioner providing calibrated 10-bit readings to microcontroller over robust I²C bus with hardware alert on threshold breach. Use Value: AS pin enables unique I²C address assignment across multiple sensor nodes; −40°C to +85°C rating ensures reliability in under-dash environments. |
Use Scenario: Portable ECG/SpO₂ monitors acquiring lead voltage, photodiode current, and temperature for real-time waveform analysis. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing biopotential signals with 11 MHz full-power bandwidth and programmable alert on arrhythmia indicators. Use Value: Channel-to-channel isolation >90 dB prevents crosstalk between ECG leads and SpO₂ photodiode channels; 2 µs conversion enables high-fidelity waveform capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7998BRUZ-1REEL | 12-bit resolution, 70.5 dB SINAD min, higher THD rejection (−78 dB), but 1.4× higher power in active mode | Required where higher dynamic range is critical (e.g., audio diagnostics, precision instrumentation) | Select AD7998BRUZ-1REEL when 12-bit accuracy and improved SFDR (−79 dB) outweigh power and cost trade-offs |
| ADS1115IDGSR | 16-bit delta-sigma ADC, 860 SPS max, built-in PGA (up to 16×), no external reference required, but no high-speed I²C mode | Better suited for low-frequency, high-resolution measurements (e.g., strain gauges, thermocouples) with gain flexibility | Choose ADS1115IDGSR for DC-critical, low-bandwidth applications needing onboard amplification and no external REFIN |
Compared with AD7997BRUZ-1REEL, AD7998BRUZ-1REEL delivers 2-bit higher resolution at the cost of increased power and reduced maximum throughput, while ADS1115IDGSR trades speed and I²C speed for precision and integrated signal conditioning-making each optimal for distinct signal chain architectures.
Availability
AD7997BRUZ-1REEL is available at Aetrix Electronics and suitable for industrial sensor hubs, smart energy metering, and automotive cabin monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7997BRUZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7997/AD7998 product line was designed specifically for space-constrained, low-power multichannel data acquisition systems requiring I²C connectivity, hardware alerting, and seamless integration with microcontrollers in harsh environments.
FAQ
What is the maximum I²C clock frequency supported by AD7997BRUZ-1REEL?
The AD7997BRUZ-1REEL supports I²C high-speed mode up to 3.4 MHz when the AS pin is driven to VDD or AGND (configuring AD7997-1 variant). This enables minimum 121 kSPS throughput in Mode 1 and reduces total conversion+read latency to under 10 µs per channel. Standard (100 kHz) and fast (400 kHz) modes are also supported for backward compatibility.
Does AD7997BRUZ-1REEL require an external reference voltage?
Yes, AD7997BRUZ-1REEL requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and stable decoupling (0.1 µF + 1 µF ceramic capacitors to AGND) is mandatory. Unlike delta-sigma ADCs, it does not include an internal reference, enabling design flexibility with precision external references such as REF192 or ADR45xx series.
How many I²C addresses can be assigned to AD7997BRUZ-1REEL?
The AD7997BRUZ-1REEL supports five unique I²C addresses via the AS pin: AGND (0100001), VDD (0100010), and floating (0100000) for AD7997-0 variants; AGND (0100011) and VDD (0100100) for AD7997-1 variants. This allows up to five AD7997BRUZ-1REEL devices on a single I²C bus without address conflict or software remapping.
What is the purpose of the ALERT/BUSY pin on AD7997BRUZ-1REEL?
The ALERT/BUSY pin on AD7997BRUZ-1REEL is a dual-function open-drain output configurable via internal registers. When set as ALERT, it asserts low when any channel's conversion result exceeds programmed DATAHIGHLIMIT or DATALOWLIMIT values-enabling hardware interrupt-driven fault detection. As BUSY, it indicates active conversion, simplifying timing in polled systems without requiring status register reads.
Can AD7997BRUZ-1REEL operate from a 3.3 V supply?
Yes, AD7997BRUZ-1REEL is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. At 3.3 V, it achieves 1 µA max shutdown current, 0.15 mA max active current with 400 kHz I²C, and maintains full 10-bit performance with ±0.5 LSB INL. All logic thresholds (VINH/VINL) scale proportionally, ensuring reliable interface with 3.3 V microcontrollers.
AD7997BRUZ-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:
- 10
- 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:
- -
AD7997BRUZ-1REEL FAQ
1.How can I place an order for AD7997BRUZ-1REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7997BRUZ-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 AD7997BRUZ-1REEL reliable?
The price and inventory of AD7997BRUZ-1REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7997BRUZ-1REEL is usually 5 days.
3.What payment methods are accepted for AD7997BRUZ-1REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7997BRUZ-1REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7997BRUZ-1REEL?
AD7997BRUZ-1REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7997BRUZ-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 AD7997BRUZ-1REEL?
For technical support, including AD7997BRUZ-1REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7997BRUZ-1REEL requirements.
6.How does Aetrix verify that AD7997BRUZ-1REEL is sourced from the original manufacturer or authorized distributors?
All AD7997BRUZ-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 AD7997BRUZ-1REEL meets industry standards.
7.What is the process for return or replacement of AD7997BRUZ-1REEL?
All AD7997BRUZ-1REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7997BRUZ-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 AD7997BRUZ-1REEL part is unused and in its original packaging.
Return procedure for AD7997BRUZ-1REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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