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Analog Devices Inc. AD7998BRUZ-0REEL
- Part No.:
- AD7998BRUZ-0REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7998BRUZ-0REEL.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,783
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Product details
Overview
AD7998BRUZ-0REEL from Analog Devices is a 12-bit, 8-channel successive approximation ADC with I²C-compatible serial interface, 2 µs conversion time, 0 to VDD reference range (1.2 V–5.5 V), and −40°C to +85°C operating temperature. It serves as a system-level analog front-end for sensor monitoring in industrial control and data acquisition systems.
For engineers reviewing the AD7998BRUZ-0REEL datasheet, AD7998BRUZ-0REEL pinout, AD7998BRUZ-0REEL application, or AD7998BRUZ-0REEL equivalent, key selection criteria include its 12-bit resolution with ±1 LSB INL, 70.5 dB SINAD at 10 kHz input, 188 kSPS throughput in Mode 2 at 5 V, and pin-selectable I²C addressing via AS pin for multi-device bus configuration.
Technical Context
The AD7998BRUZ-0REEL implements an 8:1 analog multiplexer feeding a track-and-hold amplifier and 12-bit SAR core, supporting single-ended inputs up to 11 MHz full-power bandwidth. Its I²C interface operates in standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes depending on variant-this part is the -0 version, limited to 400 kHz SCL.
Conversion is initiated either by CONVST edge, I²C command write, or automatic cycle timer. On-chip limit registers (DATAHIGH/DATALOW per channel) feed an open-drain ALERT/BUSY pin that functions as out-of-range interrupt or busy indicator, configurable via internal registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise sensor digitization |
| Conversion Time | 2 µs typ - enables rapid sampling of transient analog signals without pipeline latency |
| SINAD | 70.5 dB min at 10 kHz - ensures >11.5 effective bits of dynamic accuracy for clean signal capture |
| INL | ±1 LSB max - guarantees monotonicity and linearity critical for closed-loop control feedback |
| Supply Range | 2.7 V to 5.5 V - supports direct integration with 3.3 V and 5 V microcontroller systems |
| I²C Speed | Up to 400 kHz - compatible with standard/fast-mode buses; no high-speed mode support |
| Power-Down Current | 1 µA max - minimizes quiescent draw during idle periods in battery-powered nodes |
Pinout & Package
AD7998BRUZ-0REEL is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal dissipation. 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 isolated from digital ground to prevent noise coupling |
| VDD (Pins 2,5) | Power Supply Input | Single 2.7–5.5 V rail powering analog and digital sections; decoupling required near each pin |
| REFIN (Pin 6) | External Reference Input | Accepts 1.2 V to VDD reference voltage; determines full-scale input range (0 to REFIN) and directly impacts LSB size |
| VIN1–VIN8 (Pins 7,8,9,10,11,12,13,14) | Single-Ended Analog Inputs | Eight independent channels; each accepts 0 V to REFIN input; no internal gain or buffering |
| AS (Pin 15) | I²C Address Select | Logic level selects one of three I²C addresses (AGND=0x41, VDD=0x42, float=0x40); enables up to 3 devices on same bus |
| CONVST (Pin 16) | Convert Start Trigger | Rising edge powers up device; falling edge initiates conversion - supports hardware-synchronized sampling |
| ALERT/BUSY (Pin 17) | Configurable Open-Drain Output | Programmable as out-of-range interrupt (based on DATAHIGH/DATALOW registers) or BUSY flag during conversion |
| SDA (Pin 18) | I²C Bidirectional Data | Open-drain I/O requiring external pull-up; supports read/write of 8 internal registers including conversion results and limits |
| SCL (Pin 19) | I²C Clock Input | Open-drain clock input; timing compliant with I²C standard/fast-mode specs up to 400 kHz |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel single-ended MUX + SAR core | Reduces board space vs. multiple discrete ADCs; eliminates need for external multiplexing and signal conditioning |
| Programmable out-of-range alert | Hardware interrupt generation without MCU polling - lowers CPU load in real-time monitoring applications |
| Automatic shutdown between conversions | 1 µA max quiescent current extends battery life in portable instrumentation and remote sensors |
| Flexible reference input (1.2 V to VDD) | Enables use of precision internal references or rail-to-rail external sources - maximizes dynamic range across supply voltages |
| Three I²C address options via AS pin | Allows daisy-chaining up to 3 AD7998BRUZ-0REEL devices on one bus - simplifies multi-sensor node design |
Applications
| Industrial Sensor Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage/current measurement from 8 temperature, pressure, and flow sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Centralized analog front-end performing synchronized 12-bit digitization with programmable alert thresholds. Use Value: Eliminates external multiplexers and reduces firmware overhead via hardware-based out-of-range interrupts. |
Use Scenario: Multi-point calibration and pass/fail testing of analog outputs in benchtop test instruments. IC Role / Device Role / Timing Role: High-throughput data acquisition engine capturing 188 kSPS bursts under I²C command control. Use Value: Enables deterministic sampling intervals and register-based limit checking without host processor intervention. |
| Energy Metering Interface | Building Automation Systems |
Use Scenario: Monitoring auxiliary analog signals (voltage sag, neutral current, ambient temp) alongside primary metrology ICs. IC Role / Device Role / Timing Role: Secondary ADC providing supervisory measurements with independent reference and alert capability. Use Value: Adds fault detection layer using same I²C bus and power domain - no additional isolation or supply rails needed. |
Use Scenario: Distributed HVAC zone controllers acquiring room temp, humidity, CO₂, and valve position feedback. IC Role / Device Role / Timing Role: Low-power analog hub managing eight sensor inputs with automatic sleep/wake cycling. Use Value: Reduces average current to <1 µA during idle periods while retaining fast wake-on-alert response. |
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-0REEL | 10-bit resolution, 61 dB SINAD, identical pinout and I²C interface | Lower precision suitable for cost-sensitive industrial monitoring where 10-bit linearity suffices | Select when SNR >60 dB and INL ±0.5 LSB meet system requirements and BOM cost is prioritized |
| ADS1115IDGSR | 16-bit delta-sigma ADC, 860 SPS max, built-in PGA (1–16×), no external reference required | Better resolution but slower speed; integrated PGA enables direct connection to mV-level sensors | Choose for high-precision, low-frequency measurements (e.g., strain gauges) where oversampling is acceptable |
Compared with AD7997BRUZ-0REEL, the AD7998BRUZ-0REEL provides 2 extra bits of resolution and 9.5 dB higher SINAD at 10 kHz, justifying its use in noise-sensitive signal chains; versus ADS1115IDGSR, it trades resolution and PGA flexibility for 200× higher throughput and simpler reference management.
Availability
AD7998BRUZ-0REEL is available at Aetrix Electronics and suitable for industrial sensor monitoring, automated test equipment, energy metering interfaces, and building automation systems requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for AD7998BRUZ-0REEL 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 over 50 years of innovation in precision data conversion and signal conditioning.
The AD7998BRUZ-0REEL belongs to Analog Devices' I²C-compatible precision ADC product family, designed specifically for space-constrained, low-power industrial and instrumentation applications requiring multi-channel analog sensing with minimal software overhead.
FAQ
What is the maximum I²C clock frequency supported by AD7998BRUZ-0REEL?
The AD7998BRUZ-0REEL is the "-0" variant and supports I²C standard and fast modes only, with a maximum SCL frequency of 400 kHz. It does not support high-speed mode (3.4 MHz), which is exclusive to the "-1" variant. This limitation is defined in the ordering guide and confirmed in Table 3 of the Rev. 0 datasheet.
Does AD7998BRUZ-0REEL require an external voltage reference?
Yes, AD7998BRUZ-0REEL 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 input range (0 V to REFIN). No internal reference is provided, and the device draws ±1 µA leakage from REFIN per the datasheet specifications.
How many I²C addresses can be assigned to AD7998BRUZ-0REEL?
AD7998BRUZ-0REEL supports three I²C addresses via the AS pin: 0x40 (AS floating), 0x41 (AS = AGND), and 0x42 (AS = VDD). This allows up to three AD7998BRUZ-0REEL devices to share the same I²C bus without address conflict, as specified in Table 6 of the datasheet.
What is the purpose of the ALERT/BUSY pin on AD7998BRUZ-0REEL?
The ALERT/BUSY pin on AD7998BRUZ-0REEL is a dual-function open-drain output. When configured as ALERT, it asserts low when any channel's conversion result exceeds user-programmed DATAHIGH or DATALOW register thresholds. As BUSY, it indicates active conversion. Configuration is controlled via the Configuration Register.
Can AD7998BRUZ-0REEL perform simultaneous sampling across all 8 channels?
No, AD7998BRUZ-0REEL uses a single SAR core with an internal 8:1 multiplexer and cannot sample all channels simultaneously. It sequentially converts each selected channel with 2 µs conversion time per sample. True simultaneous sampling requires multiple independent ADCs or dedicated SARs per channel.
AD7998BRUZ-0REEL 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-0REEL FAQ
1.How can I place an order for AD7998BRUZ-0REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7998BRUZ-0REEL 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-0REEL reliable?
The price and inventory of AD7998BRUZ-0REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7998BRUZ-0REEL is usually 5 days.
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AD7998BRUZ-0REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7998BRUZ-0REEL 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-0REEL?
For technical support, including AD7998BRUZ-0REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7998BRUZ-0REEL requirements.
6.How does Aetrix verify that AD7998BRUZ-0REEL is sourced from the original manufacturer or authorized distributors?
All AD7998BRUZ-0REEL 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-0REEL meets industry standards.
7.What is the process for return or replacement of AD7998BRUZ-0REEL?
All AD7998BRUZ-0REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7998BRUZ-0REEL, 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-0REEL part is unused and in its original packaging.
Return procedure for AD7998BRUZ-0REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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