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Analog Devices Inc. AD7490BRUZ-REEL
- Part No.:
- AD7490BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7490BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,207
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Product details
Overview
AD7490BRUZ-REEL from Analog Devices is a 12-bit, 16-channel, successive approximation ADC with integrated sequencer, operating from a single 2.7 V to 5.25 V supply and delivering up to 1 MSPS throughput. It features 69.5 dB SNR at 50 kHz input, 0.5 µA full shutdown current, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface. It is used in multichannel system monitoring and power line monitoring where high channel density and low power are critical.
For engineers reviewing the AD7490BRUZ-REEL datasheet, AD7490BRUZ-REEL pinout, AD7490BRUZ-REEL application, or AD7490BRUZ-REEL equivalent, key selection considerations include sequencer-configurable channel cycling, VDRIVE-independent 3 V/5 V logic interfacing, 12-bit DC accuracy (±1 LSB INL), wide analog input bandwidth (8.2 MHz full-power), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The AD7490BRUZ-REEL implements a track-and-hold amplifier with 300 ns acquisition time and no pipeline delay, enabling precise sampling on the falling edge of CS. Its conversion timing is fully synchronized to the SCLK frequency - 16 clock cycles per conversion - allowing deterministic timing control in microprocessor- or DSP-coupled systems.
It uses a programmable control register to configure input range (0 V to REFIN or 0 V to 2 × REFIN), output coding (straight binary or twos complement), sequencer mode, and shutdown behavior. The VDRIVE pin decouples logic I/O voltage (2.7 V–5.25 V) from analog supply (VDD), enabling direct interfacing with mixed-voltage host processors without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precision measurement applications. |
| Throughput Rate | 1 MSPS - supports real-time capture of fast transients in power quality monitoring and motor control feedback loops. |
| SNR @ 50 kHz | 69.5 dB - enables accurate digitization of sensor signals with >11.5 effective bits in industrial sensing. |
| Input Channels | 16 single-ended - reduces external multiplexer count and PCB area in multi-sensor data loggers. |
| Full Shutdown Current | 0.5 µA - extends battery life in portable instrumentation during idle periods without firmware intervention. |
| Supply Range | 2.7 V to 5.25 V - supports operation across Li-ion (3.0–4.2 V), 3.3 V, and 5 V embedded systems without regulators. |
| VDRIVE Range | 2.7 V to 5.25 V - allows direct connection to 3 V or 5 V microcontrollers while VDD powers analog circuitry independently. |
Pinout & Package
AD7490BRUZ-REEL is packaged in a 28-lead TSSOP (ROHS-compliant, lead-free, tape-and-reel). All NC pins must be connected directly to AGND. Exposed pad is not present in TSSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low signal that initiates conversion and frames serial data transfer; sampling occurs on its falling edge. |
| SCLK | Serial Clock | Master clock for both data transfer and internal ADC conversion timing; 16 cycles required per sample. |
| DIN / DOUT | Serial Data In / Out | Shared bidirectional SPI bus line: DIN accepts 16-bit control register writes; DOUT outputs 4-bit channel address + 12-bit result MSB-first. |
| VIN0–VIN15 | Analog Inputs | 16 single-ended channels multiplexed into internal T/H; unused inputs must tie to AGND to prevent noise coupling. |
| REFIN | Reference Input | Accepts external 2.5 V ±1% reference; sets full-scale range for both 0–REFIN and 0–2×REFIN modes. |
| VDD | Analog Power Supply | Supplies core ADC, T/H, and sequencer; must be 4.75–5.25 V for 0–2×REFIN operation. |
| VDRIVE | Digital I/O Supply | Sets logic threshold for CS, SCLK, DIN, DOUT; independent of VDD, enabling mixed-voltage system integration. |
| AGND | Analog Ground | Single-point ground reference for all analog signals, REFIN, and internal circuitry; multiple pins require low-impedance star connection. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sequencer | Enables preconfigured channel scan order (e.g., VIN0→VIN3→VIN7→VIN12) without host CPU overhead - ideal for cyclic sensor polling. |
| No Pipeline Delay | Guarantees deterministic latency: conversion completes exactly 16 SCLK cycles after CS fall - essential for closed-loop timing predictability. |
| VDRIVE Voltage Independence | Allows DOUT/CS/SCLK/DIN to operate at 3 V while VDD runs at 5 V (or vice versa), eliminating level-shifter components in mixed-supply designs. |
| Flexible Input Ranging | Software-selectable 0–REFIN (straight binary) or 0–2×REFIN (twos complement) ranges via RANGE bit - supports both unipolar and bipolar-equivalent measurements. |
| AEC-Q100 Qualified | Rated for −40°C to +125°C operation (W grade); qualified per AEC-Q100 Rev H - suitable for under-hood automotive data acquisition modules. |
Applications
| Power Line Monitoring | Battery-Powered Data Logger |
|---|---|
Use Scenario: Real-time acquisition of voltage, current, and harmonic content across 3-phase distribution lines. IC Role / Device Role / Timing Role: 16-channel ADC samples synchronized phase voltages and CT outputs; sequencer cycles through channels at 1 MSPS to capture transient events like surges or sags. Use Value: 69.5 dB SNR and 8.2 MHz full-power bandwidth preserve waveform fidelity up to 50th harmonic (2.5 kHz @ 50 Hz base), enabling IEEE 519-compliant power quality analysis. |
Use Scenario: Long-term environmental sensing (temperature, humidity, gas) in remote field deployments powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: ADC performs burst-mode conversions on selected sensors every 10 seconds; enters full shutdown (0.5 µA) between acquisitions. Use Value: 5.4 mW max power at 870 kSPS with 3 V supplies and sub-µA shutdown enable >5-year battery life without compromising channel count or resolution. |
| Multichannel Industrial Sensor Hub | Automotive Onboard Diagnostics (OBD) |
Use Scenario: Centralized signal conditioning for 12+ analog sensors (pressure, strain, thermocouple) in PLC I/O modules. IC Role / Device Role / Timing Role: AD7490BRUZ-REEL replaces discrete multiplexer + single-channel ADC; sequencer automates round-robin conversion of all active channels. Use Value: Eliminates external MUX and associated layout complexity; ±1 LSB INL and channel-to-channel isolation >82 dB ensure consistent accuracy across all 16 inputs without calibration per channel. |
Use Scenario: Engine control unit (ECU) subsystem capturing crankshaft position, knock sensor, MAP, and O₂ sensor signals for real-time combustion analysis. IC Role / Device Role / Timing Role: AEC-Q100 qualified ADC acquires synchronized samples from safety-critical engine sensors; VDRIVE = 3.3 V interfaces directly with 3.3 V MCU while VDD = 5 V powers analog front-end. Use Value: −40°C to +125°C operation and robust ESD tolerance (HBM ±2000 V in TSSOP) meet automotive environmental and reliability requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7492BRUZ | 8-channel, same 1 MSPS rate and 12-bit resolution but lacks sequencer; requires external channel management logic. | Suitable only when ≤8 inputs are needed and host processor can handle channel sequencing in software. | Select AD7492BRUZ only if channel count is ≤8 and sequencer functionality is unnecessary - reduces BOM cost but increases firmware complexity. |
| ADS8688IPWR | 8-channel, 16-bit, 1 MSPS, integrated reference and PGA; SPI interface but no built-in sequencer; consumes 22 mW at 5 V. | Targets higher-resolution applications (e.g., precision test equipment) where 12-bit resolution is insufficient. | Choose ADS8688IPWR when 16-bit resolution and on-chip PGA are required; avoid if 12-bit performance and sequencer automation are primary needs. |
Compared with AD7492BRUZ and ADS8688IPWR, the AD7490BRUZ-REEL uniquely combines 16-channel count, hardware sequencer, and sub-µA shutdown in a single 28-lead TSSOP - making it optimal for space-constrained, battery-aware, and high-channel-density systems where deterministic timing and minimal host intervention are design priorities.
Availability
AD7490BRUZ-REEL is available at Aetrix Electronics and suitable for multichannel system monitoring, battery-powered equipment, and power line monitoring requiring stable component supply across industrial, automotive, and instrumentation markets.
Supply support for AD7490BRUZ-REEL 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, with over 50 years of innovation in precision data conversion and signal conditioning.
The AD7490BRUZ-REEL belongs to Analog Devices' high-speed SAR ADC product line, designed specifically for applications demanding high channel density, low power, and deterministic timing in harsh environments - including automotive diagnostics, industrial process control, and portable instrumentation.
FAQ
What is the maximum sample rate supported by the AD7490BRUZ-REEL?
The AD7490BRUZ-REEL supports a maximum throughput rate of 1 MSPS when operated with a 20 MHz SCLK and VDD = 4.75 V to 5.25 V. At 3 V supplies, the maximum SCLK is 16 MHz, yielding 870 kSPS. Conversion time is fixed at 16 SCLK cycles, so actual rate scales linearly with clock frequency - enabling flexible trade-offs between speed and power.
Does the AD7490BRUZ-REEL require an external reference voltage?
Yes, the AD7490BRUZ-REEL requires an external reference applied to the REFIN pin. For specified performance, REFIN must be 2.5 V ±1%. The device supports two input ranges: 0 V to REFIN (straight binary) or 0 V to 2 × REFIN (twos complement), both configured via the RANGE bit in the control register. No internal reference is provided.
How does the sequencer function in the AD7490BRUZ-REEL work?
The AD7490BRUZ-REEL sequencer is controlled via the SEQ and SHADOW bits in the 16-bit control register. When enabled, it automatically cycles through a user-defined subset of the 16 input channels (selected using ADD3–ADD0 bits) in ascending order. Each conversion triggers the next channel in sequence without host intervention - reducing CPU load in continuous monitoring applications.
What package type is used for the AD7490BRUZ-REEL?
The AD7490BRUZ-REEL is supplied in a 28-lead TSSOP package (ROHS-compliant, lead-free, tape-and-reel). It is distinct from the 32-lead LFCSP variant (e.g., AD7490BCPZ-REEL7). Pin 4 and Pin 18 are NC (no connect) and must be tied directly to AGND per datasheet guidance. Thermal resistance θJA is 97.9°C/W.
Is the AD7490BRUZ-REEL qualified for automotive applications?
Yes - the AD7490BRUZ-REEL is AEC-Q100 qualified for automotive applications. It is rated for operation from −40°C to +125°C (W grade temperature range) and meets stress testing requirements per AEC-Q100 Rev H. This makes it suitable for under-hood and transmission-control module applications where extended temperature and reliability are mandatory.
AD7490BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 16
- Input Type:
- Single Ended
- Data Interface:
- DSP, MICROWIRE™, QSPI™, and SPI™
- 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 ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7490BRUZ-REEL FAQ
1.How can I place an order for AD7490BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7490BRUZ-REEL 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 AD7490BRUZ-REEL reliable?
The price and inventory of AD7490BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7490BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7490BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7490BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7490BRUZ-REEL?
AD7490BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7490BRUZ-REEL 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 AD7490BRUZ-REEL?
For technical support, including AD7490BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7490BRUZ-REEL requirements.
6.How does Aetrix verify that AD7490BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7490BRUZ-REEL 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 AD7490BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7490BRUZ-REEL?
All AD7490BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7490BRUZ-REEL, 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 AD7490BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7490BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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