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Analog Devices Inc. AD7998BRUZ-1
- Part No.:
- AD7998BRUZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7998BRUZ-1.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:807
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Product details
Overview
AD7998BRUZ-1 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 operating temperature. It supports up to 188 kSPS throughput in high-speed I²C mode and integrates an 8:1 analog multiplexer, track-and-hold amplifier, and programmable out-of-range alert for industrial sensor monitoring systems.
For engineers reviewing the AD7998BRUZ-1 datasheet, AD7998BRUZ-1 pinout, AD7998BRUZ-1 application, or AD7998BRUZ-1 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL, I²C high-speed mode (3.4 MHz), pin-selectable addressing via AS, ALERT/BUSY dual-function output, and requirement for external reference (1.2 V to VDD).
Technical Context
The AD7998BRUZ-1 implements a successive approximation register (SAR) architecture with integrated 8:1 multiplexer and track-and-hold, enabling single-cycle conversions at 2 µs. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes-confirmed for the -1 variant-and includes address selection via AS pin to support up to five devices on one bus.
Conversion control operates in three modes: CONVST-triggered (Mode 1), command-mode writes (Mode 2), or automatic cycle interval (Mode 3). The device features on-chip limit registers (CH1–CH4), hysteresis configuration, and an open-drain ALERT/BUSY output that functions as either out-of-range interrupt or busy indicator based on register settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic transfer function and no missing codes across full scale |
| Conversion Time | 2 µs typical - enables real-time sampling of signals up to 11 MHz full-power bandwidth |
| SINAD | 70.5 dB min at 10 kHz input - supports accurate measurement of low-distortion analog signals |
| I²C Speed Support | Up to 3.4 MHz (high-speed mode) - reduces serial transaction overhead for high-throughput data acquisition |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails without level-shifting |
| Reference Input Range | 1.2 V to VDD - allows flexible external reference selection including rail-to-rail or precision references |
| Shutdown Current | 1 µA max - minimizes power in idle states for battery-powered or energy-sensitive applications |
Pinout & Package
AD7998BRUZ-1 is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal performance. 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 for all internal circuitry; must be connected to low-noise analog ground plane |
| 2, 5 | VDD | Main power supply input; decoupling capacitors required per layout guidelines |
| 6 | REFIN | External voltage reference input; accepts 1.2 V to VDD with 69 kΩ input impedance during conversion |
| 7–14 | VIN1–VIN8 | Single-ended analog inputs; each accepts 0 V to REFIN range with 30 pF input capacitance |
| 15 | AS | Address select logic input; sets I²C address to one of five options (0100000–0100100 binary) |
| 16 | CONVST | Edge-triggered convert start signal; rising edge powers up device, falling edge initiates conversion |
| 17 | ALERT/BUSY | Open-drain configurable output; serves as out-of-range interrupt or conversion-in-progress indicator |
| 18 | SDA | I²C bidirectional data line; requires external pull-up resistor |
| 19 | SCL | I²C clock input; open-drain, requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Programmable out-of-range detection | Configurable high/low limit registers per channel (CH1–CH4) with hysteresis enablement |
| Multi-mode conversion control | Supports hardware-triggered (CONVST), software-commanded, and auto-cycling operation |
| Low-power shutdown | 1 µA max quiescent current with automatic wake-on-CONVST or I²C activity |
| Flexible I²C addressing | Three address options via AS pin (AGND/VDD/floating), enabling up to five AD7998BRUZ-1 units on one bus |
| On-chip register set | Includes configuration, conversion result, alert status, cycle timer, and per-channel limit/hysteresis registers |
Applications
| Industrial Process Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Continuous voltage and temperature sensing across multiple sensors in PLC I/O modules. IC Role / Device Role / Timing Role: 8-channel analog front-end digitizing thermocouple, RTD, and voltage outputs with I²C streaming to microcontroller. Use Value: Eliminates need for external multiplexer and level-shifting; 2 µs conversion time supports >100 Hz per-channel sampling in automatic cycle mode. |
Use Scenario: Cell voltage and pack temperature monitoring in 12S–48S EV battery packs. IC Role / Device Role / Timing Role: High-accuracy, isolated analog acquisition node interfacing to battery monitor MCU via I²C. Use Value: 12-bit resolution with ±1 LSB INL ensures <0.025% full-scale accuracy; ALERT output flags overvoltage/undervoltage events without polling. |
| Medical Patient Vital Signs | Smart Building Environmental Sensing |
Use Scenario: Multi-parameter physiological monitoring (ECG lead voltages, SpO₂ photodiode currents, respiration impedance). IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing synchronized analog waveforms across eight channels. Use Value: −90 dB channel-to-channel isolation prevents crosstalk between ECG leads; 1.2 V to VDD reference flexibility supports low-voltage sensor biasing. |
Use Scenario: Distributed HVAC zone controllers measuring temperature, humidity, CO₂, and airflow pressure. IC Role / Device Role / Timing Role: Centralized analog acquisition hub aggregating sensor data for local regulation and cloud reporting. Use Value: I²C high-speed mode (3.4 MHz) enables rapid burst reads from all 8 channels; shutdown current <1 µA extends battery life in wireless nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7997BRUZ-1 | 10-bit resolution, 61 dB SINAD, same pinout and I²C interface | Lower accuracy requirements; cost-sensitive designs where 10-bit suffices | Select when system SNR budget allows ≥61 dB and 10-bit code depth meets control loop resolution needs |
| ADS7957SRHBT | Texas Instruments 12-bit, 8-channel SAR ADC with SPI interface, 1.25 µs conversion, 2.7–5.25 V supply | Requires SPI host instead of I²C; lacks built-in ALERT output and limit registers | Choose when existing design uses SPI infrastructure and external interrupt logic can replace ALERT functionality |
Compared with AD7997BRUZ-1, AD7998BRUZ-1 delivers 9.5 dB higher SINAD and tighter DC accuracy (±1 LSB INL vs. ±0.5 LSB), while ADS7957SRHBT offers faster conversion but mandates SPI redesign and external alert handling-making AD7998BRUZ-1 optimal for I²C-based, precision multi-sensor systems requiring autonomous out-of-range signaling.
Availability
AD7998BRUZ-1 is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, medical vital signs acquisition, smart building environmental sensing, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for AD7998BRUZ-1 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-1 belongs to Analog Devices' I²C-compatible precision SAR ADC product family, designed specifically for space-constrained, low-power, multi-sensor data acquisition systems requiring integrated multiplexing, programmable alerting, and simplified serial interfacing.
FAQ
What is the maximum I²C clock frequency supported by AD7998BRUZ-1?
The AD7998BRUZ-1 supports I²C high-speed mode up to 3.4 MHz when the AS pin is tied to VDD or AGND (−1 variant), enabling throughput rates up to 188 kSPS at 5 V supply. Standard (100 kHz) and fast (400 kHz) modes are also supported. This capability is confirmed in Table 3 of the AD7997/AD7998 Rev. 0 datasheet and applies specifically to the AD7998BRUZ-1 part number.
Does AD7998BRUZ-1 require an external reference voltage?
Yes, AD7998BRUZ-1 requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and the device specifies 69 kΩ input impedance during conversion. A 0.1 µF and 1 µF capacitor pair is recommended between REFIN and AGND for stability. This requirement is explicitly stated in the General Description and Functional Block Diagram sections of the AD7998BRUZ-1 datasheet.
How many I²C addresses can be assigned to AD7998BRUZ-1?
The AD7998BRUZ-1 supports five distinct I²C addresses via the AS pin: AGND (0100001), VDD (0100010), and floating (0100000) configurations, plus two additional addresses (0100011 and 0100100) reserved for the AD7998-1 version. All five are valid and documented in Table 6 of the AD7998BRUZ-1 datasheet, enabling up to five AD7998BRUZ-1 devices on a single I²C bus.
What is the purpose of the ALERT/BUSY pin on AD7998BRUZ-1?
The ALERT/BUSY pin on AD7998BRUZ-1 is a configurable open-drain output. When set as ALERT, it asserts when any enabled channel's conversion result exceeds programmed high/low limits stored in DATALOWLIMIT/DATAHIGHLIMIT registers. When configured as BUSY, it goes active during conversion. Its dual function eliminates need for separate status lines, and behavior is controlled entirely via internal configuration registers per the AD7998BRUZ-1 register map.
What is the guaranteed DC accuracy of AD7998BRUZ-1 at full scale?
The AD7998BRUZ-1 guarantees ±1 LSB integral nonlinearity (INL) and ±2 LSB gain error over temperature (−40°C to +85°C), with ±1 LSB gain error match between channels. These values are specified in Table 2 (AD7998 Specifications) of the Rev. 0 datasheet and apply to the B-grade commercial version, ensuring consistent 12-bit monotonicity and channel-to-channel matching in precision measurement applications.
AD7998BRUZ-1 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:
- 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-1 FAQ
1.How can I place an order for AD7998BRUZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7998BRUZ-1 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-1 reliable?
The price and inventory of AD7998BRUZ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7998BRUZ-1 is usually 5 days.
3.What payment methods are accepted for AD7998BRUZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7998BRUZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7998BRUZ-1?
AD7998BRUZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7998BRUZ-1 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-1?
For technical support, including AD7998BRUZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7998BRUZ-1 requirements.
6.How does Aetrix verify that AD7998BRUZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7998BRUZ-1 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-1 meets industry standards.
7.What is the process for return or replacement of AD7998BRUZ-1?
All AD7998BRUZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7998BRUZ-1, 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-1 part is unused and in its original packaging.
Return procedure for AD7998BRUZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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