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Analog Devices Inc. AD7490BCPZ-REEL7
- Part No.:
- AD7490BCPZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7490BCPZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
AD7490BCPZ-REEL7 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 AD7490BCPZ-REEL7 datasheet, AD7490BCPZ-REEL7 pinout, AD7490BCPZ-REEL7 application, or AD7490BCPZ-REEL7 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 environments.
Technical Context
The AD7490BCPZ-REEL7 implements a track-and-hold amplifier with ≤300 ns acquisition time and no pipeline delay, enabling deterministic sampling on the falling edge of CS. Conversion timing is fully synchronous to SCLK, requiring exactly 16 clock cycles per conversion at up to 20 MHz.
Its internal sequencer supports preprogrammed channel selection across all 16 single-ended inputs, with configurable input range (0 V to REFIN or 0 V to 2×REFIN) and output coding (straight binary or twos complement). The VDRIVE pin decouples serial interface voltage (2.7 V–5.25 V) from analog supply (VDD), allowing direct interfacing with mixed-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precise sensor digitization |
| Throughput Rate | 1 MSPS - supports real-time capture of fast transients in power quality monitoring |
| SNR @ 50 kHz | 69.5 dB - enables accurate measurement of low-amplitude signals amid noise |
| Input Channels | 16 single-ended - reduces external multiplexer count and PCB area in multi-sensor systems |
| Full Shutdown Current | 0.5 µA - extends battery life in portable instrumentation during idle periods |
| Supply Range | 2.7 V to 5.25 V - operates directly from Li-ion, 3.3 V, or 5 V rails without LDO overhead |
| VDRIVE Range | 2.7 V to 5.25 V - permits independent logic-level matching to host processor I/O |
| Channel Isolation | −82 dB @ 400 kHz - prevents crosstalk-induced errors when measuring adjacent high-frequency signals |
Pinout & Package
AD7490BCPZ-REEL7 is packaged in a 32-lead LFCSP (5 mm × 5 mm, 0.5 mm pitch) with exposed pad. All NC pins must be connected to AGND; exposed pad must be soldered to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0–VIN15 | Analog Input Channels | 16 single-ended inputs multiplexed into internal T/H; unused channels must tie to AGND to prevent noise coupling |
| REFIN | Reference Input | Accepts 2.5 V ±1% external reference; sets full-scale range for both 0–REFIN and 0–2×REFIN modes |
| 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 serial interface and internal conversion timing; supports up to 20 MHz |
| DIN / DOUT | Serial Data In/Out | DIN loads control register; DOUT outputs 4-bit channel address + 12-bit result MSB-first, with programmable coding |
| VDRIVE | Logic Supply | Sets I/O voltage level independently of VDD-enables seamless interfacing with 3 V or 5 V processors |
| AGND | Analog Ground | Common reference for all analog signals, REFIN, and internal circuitry; multiple pins require low-impedance star connection |
| EPAD | Exposed Thermal Pad | Must be soldered to solid GND plane for thermal dissipation and noise reduction; not electrically isolated |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sequencer | Enables automatic round-robin or custom channel cycling without host CPU intervention-reduces firmware overhead in data loggers |
| No Pipeline Delay | Guarantees deterministic latency: conversion completes in exactly 16 SCLK cycles-critical for time-triggered control loops |
| VDRIVE Decoupling | Allows VDD = 3.3 V (analog core) while VDRIVE = 5 V (interface to legacy MCU)-eliminates level-shifter components |
| AEC-Q100 Qualified | Rated for −40°C to +125°C operation (W-grade), supporting under-hood automotive sensing applications |
| Flexible Reference Mode | Single REFIN pin supports dual input ranges (0–REFIN or 0–2×REFIN) via RANGE bit-simplifies design for bipolar or unipolar sensors |
| Low-Power Shutdown | 0.5 µA full shutdown current enables rapid wake-up from deep sleep-ideal for energy-constrained IoT edge nodes |
Applications
| Power Line Monitoring | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Real-time measurement of voltage, current, and harmonic content across 3-phase AC distribution panels. IC Role / Device Role / Timing Role: 16-channel ADC acquires synchronized samples from CT/PT sensors; sequencer scans all phases and harmonics within one 1-ms window. Use Value: 1 MSPS rate captures 50/60 Hz fundamentals plus 19th harmonics; −82 dB channel isolation prevents inter-phase crosstalk in dense sensor layouts. |
Use Scenario: Portable environmental sensor node logging temperature, humidity, and gas concentration over weeks on coin-cell battery. IC Role / Device Role / Timing Role: ADC powers up only during scheduled sampling bursts; sequencer reads all 16 sensor outputs in <1 ms before returning to 0.5 µA shutdown. Use Value: 5.4 mW at 870 kSPS (3 V) and 0.5 µA shutdown extend operational life >6 months; small LFCSP footprint saves board space. |
| Multichannel Industrial PLC I/O | Automotive Battery Management System (BMS) |
Use Scenario: Modular I/O module acquiring analog signals from pressure, flow, and position sensors in factory automation. IC Role / Device Role / Timing Role: Acts as central analog front-end; sequencer cycles through 16 field inputs with programmable gain and range per channel via control register. Use Value: Single-supply operation simplifies power design; SPI interface integrates cleanly with ARM Cortex-M host; 12-bit linearity ensures calibration stability over temperature. |
Use Scenario: Cell voltage and temperature monitoring across 16-series lithium-ion cells in EV traction battery packs. IC Role / Device Role / Timing Role: Simultaneous sampling (via sequencer) of all cell voltages within <1 µs skew; AEC-Q100 W-grade supports under-hood ambient conditions. Use Value: 69.5 dB SNR enables <1 mV RMS resolution on 5 V full-scale; −40°C to +125°C rating meets ISO 26262 ASIL-B requirements. |
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 |
|---|---|---|---|
| ADS8688IPWR | 8-channel, 16-bit, 1 MSPS; integrated reference and PGA; requires external REF; no sequencer | Better resolution but fewer channels; suited for precision single-sensor systems, not dense multichannel monitoring | Select ADS8688IPWR when absolute accuracy >12-bit and programmable gain are required; avoid when >8 channels or sequencer automation are needed. |
| AD7949BCPZ-RL7 | 16-channel, 14-bit, 1 MSPS; same LFCSP-32 package; higher power (16 mW @ 5 V); no AEC-Q100 grade | Higher resolution but lacks automotive qualification; wider supply range (2.3–5.5 V); no VDRIVE pin | Select AD7949BCPZ-RL7 when 14-bit resolution justifies extra power and non-automotive use; AD7490BCPZ-REEL7 remains preferred for AEC-Q100 and low-power automotive BMS. |
Compared with ADS8688IPWR and AD7949BCPZ-RL7, AD7490BCPZ-REEL7 uniquely balances 16-channel count, 12-bit accuracy, sequencer autonomy, AEC-Q100 compliance, and sub-µA shutdown-making it optimal for cost-sensitive, space-constrained, and automotive-qualified multichannel acquisition.
Availability
AD7490BCPZ-REEL7 is available at Aetrix Electronics and suitable for multichannel system monitoring, battery-powered equipment, and power line monitoring requiring stable component supply across industrial and automotive production lifecycles.
Supply support for AD7490BCPZ-REEL7 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 AD7490BCPZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-channel-count, low-power, and automotive-grade data acquisition systems requiring deterministic timing and minimal external components.
FAQ
What is the maximum sample rate supported by the AD7490BCPZ-REEL7?
The AD7490BCPZ-REEL7 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 rate is 870 kSPS due to SCLK limitation. Each conversion requires exactly 16 SCLK cycles, so actual rate depends on achievable SCLK frequency in the target system.
Does the AD7490BCPZ-REEL7 require an external reference voltage?
Yes, the AD7490BCPZ-REEL7 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 or 0 V to 2×REFIN-selected via the RANGE bit in the control register. No internal reference is provided.
How does the sequencer function in the AD7490BCPZ-REEL7 work?
The AD7490BCPZ-REEL7 sequencer allows preprogramming of up to 16 analog input channels (VIN0–VIN15) to be converted in a defined order. Channel selection is controlled by ADD3–ADD0 bits in the control register, combined with SEQ and SHADOW bits. Once enabled, the sequencer automatically cycles through the selected channels without host intervention, reducing software overhead.
Is the AD7490BCPZ-REEL7 pin-compatible with other members of the AD74xx family?
No, the AD7490BCPZ-REEL7 is not pin-compatible with earlier AD74xx devices such as AD7476 or AD7485. Its 32-lead LFCSP package and specific pin assignments-including dedicated VDRIVE, REFIN, and sequencer-control logic-differ significantly. Migration requires PCB layout revision and firmware adaptation.
What is the purpose of the VDRIVE pin on the AD7490BCPZ-REEL7?
The VDRIVE pin on the AD7490BCPZ-REEL7 sets the voltage level for all digital I/O pins (CS, SCLK, DIN, DOUT), independent of the analog supply VDD. This allows direct interfacing with 3 V or 5 V microcontrollers without level shifters-even when VDD is set to 3.3 V for low-power analog operation-enhancing system flexibility and reducing BOM count.
Can the AD7490BCPZ-REEL7 operate in a true differential input mode?
No, the AD7490BCPZ-REEL7 supports only 16 single-ended analog inputs. It does not provide hardware differential input pairs or internal subtraction. However, differential measurements can be implemented in software by sequentially sampling two channels (e.g., VIN0 and VIN1) and computing their difference, leveraging the channel-to-channel isolation of −82 dB to minimize crosstalk error.
AD7490BCPZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad, CSP
- 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:
- 32-LFCSP-VQ (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7490BCPZ-REEL7 FAQ
1.How can I place an order for AD7490BCPZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7490BCPZ-REEL7 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 AD7490BCPZ-REEL7 reliable?
The price and inventory of AD7490BCPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7490BCPZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7490BCPZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7490BCPZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7490BCPZ-REEL7?
AD7490BCPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7490BCPZ-REEL7 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 AD7490BCPZ-REEL7?
For technical support, including AD7490BCPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7490BCPZ-REEL7 requirements.
6.How does Aetrix verify that AD7490BCPZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7490BCPZ-REEL7 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 AD7490BCPZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7490BCPZ-REEL7?
All AD7490BCPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7490BCPZ-REEL7, 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 AD7490BCPZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7490BCPZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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