My Inquiry
My Account
Analog Devices Inc. AD7998BRU-0
- Part No.:
- AD7998BRU-0
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7998BRU-0.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,211
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7998BRU-0 from Analog Devices is a 12-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 operation. It integrates an 8:1 analog multiplexer, track-and-hold amplifier, and out-of-range alert function for sensor monitoring in industrial data acquisition systems.
For engineers reviewing the AD7998BRU-0 datasheet, AD7998BRU-0 pinout, AD7998BRU-0 application, or AD7998BRU-0 equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-ready procurement details - all grounded in the official Rev. 0 datasheet and Analog Devices' product documentation.
Technical Context
The AD7998BRU-0 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 - confirmed for the -0 variant only up to 400 kHz.
Conversion is initiated via CONVST pin edge, I²C command write, or automatic cycle timer; internal registers store high/low limits per channel and enable ALERT/BUSY open-drain output. Reference voltage (REFIN) is externally supplied from 1.2 V to VDD, enabling flexible dynamic range scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREFIN/4096 quantization step for precision sensor digitization. |
| Conversion Time | 2 µs typ - enables sampling at up to 188 kSPS in Mode 2 at 5 V, critical for fast transient capture. |
| SINAD | 70.5 dB min at 10 kHz input - supports >11-bit effective resolution in noise-sensitive measurement paths. |
| Supply Range | 2.7 V to 5.5 V - allows direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Power-Down Current | 1 µA max - minimizes standby power in battery-operated remote sensors and IoT endpoints. |
| I²C Address Modes | Pin-selectable via AS pin (AGND/VDD/floating) - permits up to three AD7998BRU-0 devices on one bus. |
| Input Channels | 8 single-ended - eliminates need for external multiplexers in multi-sensor systems like PLC I/O modules. |
Pinout & Package
AD7998BRU-0 is housed in a 20-lead TSSOP package (RU suffix), 4.4 mm × 6.5 mm body, 0.65 mm pitch, with exposed pad for thermal performance. Pin functions are validated per 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. |
| 2, 5 | VDD | Single power supply input - decoupling (0.1 µF + 1 µF) required near each VDD pin for stable conversion. |
| 6 | REFIN | External reference input - sets full-scale range (0 to REFIN); supports 1.2 V–VDD, enabling ratiometric or fixed-reference designs. |
| 7, 8, 9, 10, 11, 12, 13, 14 | VIN1–VIN8 | Single-ended analog inputs - each accepts 0 V to REFIN; no internal buffer; input capacitance 30 pF requires low-impedance source. |
| 15 | AS | Address select logic input - selects I²C address (0x41, 0x42, or 0x40 when floating) for multi-device bus configuration. |
| 16 | CONVST | Edge-triggered convert start - rising edge powers up device; falling edge initiates conversion after ≥1 µs setup. |
| 17 | ALERT/BUSY | Configurable open-drain output - alerts host MCU when channel result exceeds programmed DATAHIGH/DATALOW limits. |
| 18 | SDA | I²C bidirectional data line - requires external pull-up; supports standard/fast mode (≤400 kHz for AD7998BRU-0). |
| 19 | SCL | I²C clock input - open-drain; timing compliant with I²C spec up to 400 kHz for this -0 variant. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel sequencer with automatic cycle mode | Reduces firmware overhead by auto-cycling through all 8 inputs without repeated I²C commands. |
| Programmable out-of-range alert with hysteresis | Eliminates polling: ALERT pin asserts interrupt on violation of per-channel high/low limit registers. |
| Three I²C addresses via AS pin | Enables daisy-chaining up to three AD7998BRU-0 devices on one I²C bus without address conflict. |
| 1 µA shutdown current | Extends battery life in portable instrumentation - device powers up only during conversion or I²C activity. |
| 2 µs conversion time with 12-bit accuracy | Delivers high throughput without sacrificing resolution - suitable for closed-loop control feedback sampling. |
Applications
| Industrial Sensor Hub | PLC Analog Input Module |
|---|---|
|
Use Scenario: Centralized monitoring of 8 temperature, pressure, and current sensors in factory automation cabinets. IC Role / Device Role / Timing Role: 12-bit SAR ADC with built-in multiplexer and I²C interface handles sequential sampling and alert-driven event reporting. Use Value: Reduces BOM count by eliminating external MUX and comparator; ALERT pin triggers immediate MCU response to out-of-spec readings. |
Use Scenario: Modular I/O card acquiring analog signals from field transmitters in programmable logic controllers. IC Role / Device Role / Timing Role: Precision ADC providing isolated, calibrated 4–20 mA loop digitization with configurable thresholds. Use Value: 2.7–5.5 V supply range matches PLC backplane rails; 1 µA shutdown enables energy-efficient idle states between scan cycles. |
| Energy Meter Front-End | Medical Diagnostic Equipment |
|
Use Scenario: Simultaneous voltage and current sampling for real-time power factor and harmonic analysis in smart meters. IC Role / Device Role / Timing Role: High-SINAD (70.5 dB) ADC capturing clean waveforms at up to 188 kSPS for FFT-based computation. Use Value: 11 MHz full-power bandwidth supports accurate sampling of 50/60 Hz fundamentals plus 5th–13th harmonics without aliasing. |
Use Scenario: Multi-parameter patient monitor digitizing ECG, respiration, and SpO₂ sensor outputs. IC Role / Device Role / Timing Role: Low-noise, low-power ADC with guaranteed no-missed-codes performance across all 8 channels. Use Value: 12-bit resolution and ±1 LSB INL ensure clinical-grade accuracy; −40°C to +85°C rating supports wide ambient deployment. |
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 |
|---|---|---|---|
| AD7998BRU-1 | Supports I²C high-speed mode (3.4 MHz); same 12-bit resolution, 2 µs conversion, and pinout. | Required for systems needing >400 kHz I²C throughput or tighter timing budgets in command-mode operation. | Select AD7998BRU-1 if bus speed >400 kHz is needed; AD7998BRU-0 is optimal for cost-sensitive 100–400 kHz implementations. |
| ADS1115IDGSR | 16-bit delta-sigma ADC, 860 SPS max, internal reference, no ALERT pin, 10-lead VSSOP package. | Better resolution but lower speed; suited for slow, high-precision DC measurements (e.g., strain gauges), not dynamic signal capture. | Choose ADS1115IDGSR only for ultra-low-noise DC sensing; AD7998BRU-0 remains superior for >10 kSPS multi-channel AC or transient applications. |
Compared with AD7998BRU-1, the AD7998BRU-0 trades higher I²C speed for lower system complexity and cost in standard/fast-mode buses; versus ADS1115IDGSR, it delivers 10× faster throughput and hardware alerting at the expense of 4-bit resolution - making it the preferred choice for real-time industrial monitoring.
Availability
AD7998BRU-0 is available at Aetrix Electronics and suitable for industrial sensor hubs, PLC analog input modules, and energy meter front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7998BRU-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7998BRU-0 belongs to Analog Devices' I²C-compatible precision ADC family, designed specifically for space-constrained, low-power industrial and instrumentation systems requiring multi-channel, software-configurable data acquisition.
FAQ
What is the maximum I²C clock frequency supported by AD7998BRU-0?
The AD7998BRU-0 supports I²C standard mode (100 kHz) and fast mode (400 kHz) only. Unlike the AD7998BRU-1, it does not support high-speed mode (3.4 MHz). This is explicitly defined in Table 2 and the General Description section of the Rev. 0 datasheet, where fSCL specifications for the -0 variant are capped at 400 kHz.
Does AD7998BRU-0 include an internal voltage reference?
No, AD7998BRU-0 requires an external reference applied to the REFIN pin. The datasheet specifies REFIN input voltage range as 1.2 V to VDD, with recommended decoupling (0.1 µF and 1 µF capacitors to AGND). No internal reference circuitry is present - all reference dependency is external.
How many analog input channels does AD7998BRU-0 support, and what type?
AD7998BRU-0 supports eight single-ended analog input channels (VIN1 through VIN8), as confirmed in the General Description, Features list, and Pin Function Descriptions (Table 5). It does not support differential inputs or pseudo-differential configurations - all channels are referenced to AGND with 0 V to REFIN range.
What is the purpose of the AS pin on AD7998BRU-0?
The AS (Address Select) pin on AD7998BRU-0 configures the device's I²C slave address: tied to AGND → 0x41, tied to VDD → 0x42, left floating → 0x40. This enables up to three AD7998BRU-0 units on the same I²C bus without address collision, as documented in Table 6 and the Functional Block Diagram description.
Can AD7998BRU-0 operate from a 3.3 V supply?
Yes, AD7998BRU-0 is fully specified for VDD = 2.7 V to 5.5 V, including 3.3 V operation. All key parameters - conversion time (2 µs), power consumption (0.15 mA active, 1 µA shutdown), and I²C timing - are guaranteed across this range, with explicit test conditions cited for 3.3 V in Tables 1 and 2.
AD7998BRU-0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7998BRU-0 FAQ
1.How can I place an order for AD7998BRU-0 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7998BRU-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 AD7998BRU-0 reliable?
The price and inventory of AD7998BRU-0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7998BRU-0 is usually 5 days.
3.What payment methods are accepted for AD7998BRU-0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7998BRU-0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7998BRU-0?
AD7998BRU-0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7998BRU-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 AD7998BRU-0?
For technical support, including AD7998BRU-0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7998BRU-0 requirements.
6.How does Aetrix verify that AD7998BRU-0 is sourced from the original manufacturer or authorized distributors?
All AD7998BRU-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 AD7998BRU-0 meets industry standards.
7.What is the process for return or replacement of AD7998BRU-0?
All AD7998BRU-0 units undergo pre-shipment inspection (PSI). If there is an issue with AD7998BRU-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 AD7998BRU-0 part is unused and in its original packaging.
Return procedure for AD7998BRU-0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7998BRU-0 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
