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Analog Devices Inc. AD7997BRUZ-0
- Part No.:
- AD7997BRUZ-0
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7997BRUZ-0.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,139
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Product details
Overview
AD7997BRUZ-0 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 operation over −40°C to +85°C. It integrates an 8:1 analog multiplexer, track-and-hold amplifier, and programmable limit registers for out-of-range alerting in industrial sensor monitoring systems.
For engineers reviewing the AD7997BRUZ-0 datasheet, AD7997BRUZ-0 pinout, AD7997BRUZ-0 application, or AD7997BRUZ-0 equivalent, key selection considerations include its I²C address select (AS) pin configuration, 188 kSPS maximum throughput in Mode 2 at 5 V, 1 µA shutdown current, 10-bit resolution with ±0.5 LSB INL, and support for standard/fast I²C modes only (not high-speed mode).
Technical Context
The AD7997BRUZ-0 implements a successive approximation register (SAR) architecture with integrated 8:1 multiplexer and track-and-hold, enabling single-cycle conversions without pipeline latency. Its I²C interface supports standard (100 kHz) and fast (400 kHz) modes only - unlike the -1 variant, it does not support high-speed (3.4 MHz) mode.
Conversion control is configurable via CONVST pin triggering, command-mode writes, or automatic cycle interval mode. The device uses an external reference applied to REFIN (1.2 V to VDD), and features open-drain ALERT/BUSY output with software-selectable function and programmable high/low limit registers per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - defines quantization step size and dynamic range for sensor signal digitization |
| Conversion Time | 2 µs typical - enables minimum sampling interval of 500 kSPS before interface bottleneck |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails without level shifting |
| INL (Integral Nonlinearity) | ±0.5 LSB max - ensures monotonicity and ≤0.05% full-scale linearity error across temperature |
| Shutdown Current | 1 µA max at 3 V - reduces system standby power in battery-operated data loggers |
| I²C Support Modes | Standard (100 kHz) and Fast (400 kHz) only - excludes high-speed mode; limits max throughput to 147 kSPS |
| Operating Temperature | −40°C to +85°C - qualified for industrial ambient environments without derating |
Pinout & Package
AD7997BRUZ-0 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 | Common low-impedance return for all analog circuitry; must be separated from digital ground to minimize noise coupling |
| VDD (Pins 2,5) | Power Supply Input | Single 2.7–5.5 V rail powering analog core, digital logic, and I²C interface |
| REFIN (Pin 6) | External Reference Input | Accepts 1.2 V to VDD reference voltage; determines full-scale input range (0 V to REFIN) and ADC accuracy |
| VIN1–VIN8 (Pins 7,8,9,10,11,12,13,14) | Single-Ended Analog Inputs | Eight independent channels accepting 0 V to REFIN signals; multiplexed internally to SAR core |
| AS (Pin 15) | Address Select Input | Configures I²C slave address to 0x41, 0x42, or 0x40 (float) - enables up to three devices on same bus |
| CONVST (Pin 16) | Convert Start Trigger | Rising edge powers up device; falling edge initiates conversion - supports precise timing-critical sampling |
| ALERT/BUSY (Pin 17) | Open-Drain Status Output | Programmable as out-of-range interrupt (ALERT) or conversion-in-progress indicator (BUSY) |
| SDA (Pin 18) | I²C Bidirectional Data | Open-drain interface requiring external pull-up; handles register reads/writes and configuration |
| SCL (Pin 19) | I²C Clock Input | Open-drain clock input synchronized to master; frequency capped at 400 kHz for this -0 variant |
Key Features
| Feature | Design Value |
|---|---|
| Sequencer operation with automatic channel cycling | Reduces host MCU firmware overhead by autonomously scanning all 8 inputs in user-defined order |
| Out-of-range alert with programmable high/low limits | Enables real-time fault detection without continuous polling - ALERT pin asserts on violation of CH1–CH4 thresholds |
| Pin-selectable I²C addressing (AS pin) | Allows up to three AD7997BRUZ-0 devices on one I²C bus without address conflicts or external logic |
| Automatic shutdown between conversions | Minimizes average power in intermittent-sampling applications - active only during conversion and data transfer |
| 2 µs conversion time with 10-bit accuracy | Supports high-speed transient capture (e.g., motor current spikes) while maintaining DC precision for sensor calibration |
Applications
| Industrial Sensor Monitoring | Automotive Cabin Environment Sensing |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and humidity sensor outputs in PLC I/O modules. IC Role / Device Role / Timing Role: 8-channel analog front-end digitizing multiple transducer signals with synchronized sampling and alert-driven event reporting. Use Value: Eliminates need for discrete multiplexers and external comparators; reduces BOM count and PCB area while supporting deterministic response to out-of-spec conditions. |
Use Scenario: Cabin air quality monitoring using CO₂, VOC, and relative humidity sensors in HVAC control units. IC Role / Device Role / Timing Role: Low-power, multi-input ADC interfacing to microcontroller via I²C for periodic environmental sampling. Use Value: 1 µA shutdown current extends battery life in always-on vehicle subsystems; AS pin enables co-location with other I²C sensors on shared bus. |
| Energy Metering Subsystem | Medical Diagnostic Equipment Front-End |
Use Scenario: Auxiliary voltage/current sensing for tamper detection and neutral current monitoring in smart meters. IC Role / Device Role / Timing Role: Secondary ADC capturing auxiliary analog signals with independent threshold checking via limit registers. Use Value: Programmable ALERT output provides hardware-level fault signaling to meter's main processor, bypassing software latency. |
Use Scenario: Patient parameter acquisition (e.g., ECG lead voltages, temperature, respiration) in portable diagnostic devices. IC Role / Device Role / Timing Role: Compact, low-noise 10-bit digitizer for non-critical biopotential signals requiring moderate speed and precision. Use Value: 2.7–5.5 V supply range simplifies power design; TSSOP package supports high-density layout in handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7997BRUZ-1 | Supports I²C high-speed mode (3.4 MHz), enabling 188 kSPS throughput; identical pinout and functionality otherwise | Required when system I²C bus operates above 400 kHz or demands maximum sample rate | Select AD7997BRUZ-1 if higher throughput or future bus speed scalability is needed; no PCB change required |
| AD7992BRUZ | 2-channel, 10-bit I²C ADC in same TSSOP package; lacks sequencer, limit registers, and ALERT/BUSY pin | Suitable only for simple dual-sensor systems without alerting or automatic channel cycling | Choose AD7992BRUZ where channel count and feature set are reduced to cut cost and firmware complexity |
Compared with AD7997BRUZ-1, the AD7997BRUZ-0 trades maximum throughput for guaranteed compatibility with legacy 400 kHz I²C buses; versus AD7992BRUZ, it delivers 4× channel count and integrated alerting at modest cost premium - making it optimal for mid-channel-count industrial monitoring.
Availability
AD7997BRUZ-0 is available at Aetrix Electronics and suitable for industrial sensor monitoring, automotive cabin sensing, energy metering subsystems, and medical diagnostic equipment requiring stable component supply and long-term manufacturability.
Supply support for AD7997BRUZ-0 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, headquartered in Wilmington, MA, with R&D and manufacturing facilities worldwide.
The AD7997/AD7998 product line was designed specifically for space-constrained, low-power systems requiring multichannel analog sensing with minimal MCU intervention - emphasizing I²C integration, autonomous sequencing, and hardware-based alerting.
FAQ
What is the maximum I²C clock frequency supported by AD7997BRUZ-0?
The AD7997BRUZ-0 supports standard mode (100 kHz) and fast mode (400 kHz) I²C operation only. It does not support high-speed mode (3.4 MHz), which is exclusive to the AD7997BRUZ-1 variant. At 400 kHz, the AD7997BRUZ-0 achieves up to 147 kSPS throughput in command mode, as confirmed in Table 1 of the Rev. 0 datasheet.
Does AD7997BRUZ-0 require an external reference voltage?
Yes, AD7997BRUZ-0 requires an external reference voltage applied to the REFIN pin. The reference must be in the range of 1.2 V to VDD, and the analog input range is 0 V to REFIN. A 0.1 µF and 1 µF capacitor pair is recommended between REFIN and AGND for stability, per the Typical Connection Diagram in the datasheet.
How many I²C addresses can be configured on AD7997BRUZ-0?
The AD7997BRUZ-0 supports three I²C slave addresses via the AS pin: 0x41 (AS = AGND), 0x42 (AS = VDD), and 0x40 (AS = floating). This allows up to three AD7997BRUZ-0 devices to share the same I²C bus without address conflict, as specified in Table 6 of the Rev. 0 datasheet.
What is the purpose of the ALERT/BUSY pin on AD7997BRUZ-0?
The ALERT/BUSY pin on AD7997BRUZ-0 is a software-configurable open-drain output. When set to ALERT mode, it asserts low when any enabled channel's conversion result violates its programmed DATAHIGH or DATALOW limit register value. In BUSY mode, it indicates active conversion. This dual-function pin reduces external interrupt wiring in compact designs.
Is AD7997BRUZ-0 pin-compatible with AD7998BRUZ-0?
Yes, AD7997BRUZ-0 is pin-compatible with AD7998BRUZ-0 - both use the same 20-lead TSSOP package and identical pinout. However, AD7998BRUZ-0 is a 12-bit device with different DC accuracy (±1 LSB INL) and dynamic performance (70.5 dB SINAD), so substitution requires validation of resolution and noise requirements in the target application.
AD7997BRUZ-0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-0 FAQ
1.How can I place an order for AD7997BRUZ-0 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7997BRUZ-0 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-0 reliable?
The price and inventory of AD7997BRUZ-0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7997BRUZ-0 is usually 5 days.
3.What payment methods are accepted for AD7997BRUZ-0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7997BRUZ-0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7997BRUZ-0?
AD7997BRUZ-0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7997BRUZ-0 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-0?
For technical support, including AD7997BRUZ-0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7997BRUZ-0 requirements.
6.How does Aetrix verify that AD7997BRUZ-0 is sourced from the original manufacturer or authorized distributors?
All AD7997BRUZ-0 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-0 meets industry standards.
7.What is the process for return or replacement of AD7997BRUZ-0?
All AD7997BRUZ-0 units undergo pre-shipment inspection (PSI). If there is an issue with AD7997BRUZ-0, 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-0 part is unused and in its original packaging.
Return procedure for AD7997BRUZ-0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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