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Analog Devices Inc. AD7918BRUZ-REEL7
- Part No.:
- AD7918BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7918BRUZ-REEL7.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,141
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Product details
Overview
AD7918BRUZ-REEL7 from Analog Devices is a 10-bit, 8-channel, successive approximation analog-to-digital converter (ADC) with integrated channel sequencer, 1 MSPS throughput, 2.7 V to 5.25 V single-supply operation, and SPI-compatible serial interface - used in industrial data acquisition systems for high-speed multi-sensor monitoring.
For engineers reviewing the AD7918BRUZ-REEL7 datasheet, AD7918BRUZ-REEL7 pinout, AD7918BRUZ-REEL7 application, or AD7918BRUZ-REEL7 equivalent, key selection criteria include guaranteed no-missed-codes performance to 10 bits, ±0.5 LSB INL/±0.5 LSB DNL accuracy, 61 dB SINAD at 50 kHz, flexible 0 V–REFIN or 0 V–2×REFIN input range, and automotive-qualified TSSOP-20 packaging.
Technical Context
The AD7918BRUZ-REEL7 implements a track-and-hold amplifier with 8.2 MHz full-power bandwidth and 50 ps aperture jitter, enabling accurate sampling of fast-changing sensor signals. Its conversion is initiated on the falling edge of CS and clocked by SCLK, with no pipeline delay and deterministic 800 ns conversion time at 20 MHz SCLK.
It features a programmable control register that configures input range (RANGE bit), output coding (CODING bit), sequencer mode (SEQ bit), and shadow register access (SHADOW bit), allowing preprogrammed channel cycling across VIN0–VIN7 without host processor intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes with guaranteed no-missed-codes performance. |
| Throughput Rate | 1 MSPS - supports real-time sampling of up to one million analog samples per second. |
| SINAD @ 50 kHz | 61 dB min - ensures ≥9.8 effective number of bits (ENOB) for precision measurement applications. |
| INL / DNL | ±0.5 LSB max / ±0.5 LSB max - enables accurate linear response across full scale without calibration. |
| Supply Range | 2.7 V to 5.25 V AVDD - allows direct integration into 3 V or 5 V embedded systems without level-shifting. |
| Power Dissipation | 6 mW max at 3 V / 13.5 mW max at 5 V - enables low-power operation in battery-backed or thermally constrained designs. |
| Channel Count | 8 single-ended inputs (VIN0–VIN7) with hardware sequencer - reduces host CPU overhead during multi-channel acquisition. |
| Interface | SPI/QSPI/MICROWIRE/DSP-compatible serial interface - simplifies connection to common microcontrollers and DSPs. |
Pinout & Package
AD7918BRUZ-REEL7 is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal enhancement and qualified for automotive temperature range (−40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Master clock for both data transfer and internal ADC conversion timing; determines throughput rate. |
| DIN (Pin 2) | Serial data input | Accepts 16-bit control register writes (address, RANGE, CODING, SEQ, SHADOW bits) on falling SCLK edges. |
| CS (Pin 3) | Chip select (active low) | Initiates conversion on falling edge and frames serial data transactions; enables multi-device SPI bus sharing. |
| AGND (Pins 4, 8, 17, 20) | Analog ground reference | Common return for all analog circuitry; must be isolated from digital ground to preserve SNR. |
| AVDD (Pins 5, 6) | Analog power supply | Supplies core ADC and track-and-hold; requires clean, low-noise 2.7–5.25 V source with local decoupling. |
| REFIN (Pin 7) | External reference input | Accepts 2.5 V ±1% reference; sets full-scale input range (0–2.5 V or 0–5 V depending on RANGE bit setting). |
| VIN0–VIN7 (Pins 9–16) | Analog input channels | Eight single-ended inputs; unused channels must be tied to AGND to prevent noise coupling. |
| DOUT (Pin 18) | Serial data output | Outputs 16-bit frame: leading zero + 3-bit channel address + 10-bit result + 2 trailing zeros (MSB first). |
| VDRIVE (Pin 19) | Digital I/O power supply | Independent logic voltage (2.7–5.25 V) - allows direct interfacing to 3 V or 5 V processors regardless of AVDD. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware channel sequencer | Enables autonomous, preconfigured cycling through up to eight analog inputs without host software polling. |
| VDRIVE independent logic supply | Decouples serial interface voltage from AVDD, eliminating need for external level shifters in mixed-voltage systems. |
| No pipeline delay | Guarantees deterministic latency: conversion starts on CS falling edge and completes within fixed 800 ns at 20 MHz SCLK. |
| Flexible input range selection | Supports either 0 V to REFIN (straight binary) or 0 V to 2×REFIN (twos complement) via RANGE bit in control register. |
| Low-power shutdown modes | Reduces current to 0.5 μA max in full shutdown and 960 μA typ in auto shutdown at 250 kSPS, extending system battery life. |
Applications
| Industrial Sensor Hub | Automotive Battery Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of temperature, pressure, and current sensors in PLC I/O modules. IC Role / Device Role / Timing Role: 10-bit ADC with sequencer performs synchronized sampling across 8 analog inputs at ≤1 MSPS, feeding data to ARM Cortex-M host via SPI. Use Value: Eliminates external multiplexer and timing logic; ±0.5 LSB INL ensures calibrated accuracy across all channels without per-channel trimming. | Use Scenario: Real-time cell voltage and pack temperature monitoring in 48 V mild-hybrid battery management systems. IC Role / Device Role / Timing Role: ADC digitizes up to eight battery cell voltages with 61 dB SINAD at 50 kHz, operating over −40°C to +125°C automotive temperature range. Use Value: Automotive qualification and 0.5 μA shutdown current enable reliable, low-power BMS operation under extreme thermal conditions. |
| Medical Patient Monitor Front-End | Test & Measurement Data Logger |
Use Scenario: Multi-parameter acquisition (ECG, SpO₂, respiration) in portable diagnostic devices requiring compact, low-power signal chain. IC Role / Device Role / Timing Role: Successive approximation ADC provides 10-bit resolution and 1 MSPS throughput while consuming only 6 mW at 3 V, minimizing heat and battery drain. Use Value: 8.2 MHz full-power bandwidth and 50 ps aperture jitter preserve signal fidelity for biomedical waveforms with fast slew rates. | Use Scenario: Field-deployable environmental logger capturing vibration, humidity, and ambient light across multiple sensors over extended periods. IC Role / Device Role / Timing Role: Sequencer-driven 8-channel sampling reduces firmware complexity; SPI interface enables direct connection to low-cost microcontroller with minimal GPIO usage. Use Value: Guaranteed no-missed-codes to 10 bits and ±0.5 LSB DNL ensure consistent quantization step size across full dynamic range for post-processing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, 8-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7928BRUZ-REEL7 | 12-bit resolution, 70 dB SINAD @ 50 kHz, higher INL (±1 LSB), same pinout and interface. | Used where higher resolution and SNR are required, e.g., precision instrumentation or audio test equipment. | Select when ENOB > 11 bits is mandatory and system can accommodate higher code density and slightly increased power (13.5 mW at 5 V). |
| ADS8320IPW | 16-bit, 100 kSPS, SPI interface, no built-in sequencer, 28-pin TSSOP package. | Applied in high-resolution, lower-speed applications like precision weigh scales or scientific analyzers. | Choose when absolute resolution outweighs speed and channel count; note larger footprint and absence of hardware sequencer increases host processing load. |
Compared with AD7928BRUZ-REEL7, the AD7918BRUZ-REEL7 trades 2 bits of resolution and 9 dB SINAD for lower cost, reduced data handling overhead, and tighter DC accuracy (±0.5 LSB INL vs ±1 LSB); versus ADS8320IPW, it offers 10× higher throughput and integrated sequencing at the expense of resolution and package size.
Availability
AD7918BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive battery monitors, medical patient monitors, and portable test equipment requiring stable component supply and automotive-grade reliability.
Supply support for AD7918BRUZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD79xx family was designed specifically for high-speed, low-power, multi-channel data acquisition in space-constrained industrial, automotive, and medical systems - emphasizing sequencer autonomy, flexible supply architecture, and guaranteed monotonicity.
FAQ
What is the maximum sample rate supported by the AD7918BRUZ-REEL7?
The AD7918BRUZ-REEL7 supports a maximum throughput rate of 1 MSPS (1 million samples per second), achieved with a 20 MHz serial clock (SCLK) and 16 SCLK cycles per conversion. At lower SCLK frequencies, the throughput scales linearly - for example, 10 MHz SCLK yields 500 kSPS. This rate applies across the full operating temperature range (−40°C to +125°C) and supply range (2.7 V to 5.25 V).
Does the AD7918BRUZ-REEL7 require an external reference voltage?
Yes, the AD7918BRUZ-REEL7 requires an external reference voltage applied to the REFIN pin. The datasheet specifies optimal performance with a 2.5 V ±1% reference, supporting input ranges of either 0 V to 2.5 V (RANGE = 1) or 0 V to 5.0 V (RANGE = 0, AVDD ≥ 4.75 V). The REFIN input has 36 kΩ typical impedance and ±1 μA leakage, so the reference source must drive this load without significant error.
Can the AD7918BRUZ-REEL7 operate with different analog and digital supply voltages?
Yes, the AD7918BRUZ-REEL7 supports independent analog and digital supplies: AVDD (2.7 V to 5.25 V) powers the ADC core and track-and-hold, while VDRIVE (2.7 V to 5.25 V) sets logic levels for SCLK, DIN, DOUT, and CS. This allows interfacing directly with 3 V microcontrollers even when AVDD is 5 V - no level shifters needed - and vice versa, enhancing system design flexibility.
How does the channel sequencer function in the AD7918BRUZ-REEL7?
The AD7918BRUZ-REEL7 sequencer is controlled via the SEQ bit and ADD2–ADD0 bits in the 16-bit control register. When SEQ = 1, the device automatically cycles through a preselected subset of VIN0–VIN7 in ascending order (e.g., VIN0→VIN1→…→VIN7) upon consecutive CS assertions, eliminating host CPU polling. The sequence length and starting channel are defined by the address bits, enabling efficient multi-channel acquisition with minimal firmware overhead.
Is the AD7918BRUZ-REEL7 qualified for automotive applications?
Yes, the AD7918BRUZ-REEL7 is explicitly qualified for automotive applications per the AD7908/AD7918/AD7928 datasheet Rev. E, supporting an extended temperature range of −40°C to +125°C and meeting AEC-Q200 stress test requirements. It includes automotive-specific AC performance specs (e.g., SINAD, SNR) and is packaged in a 20-lead TSSOP with qualified materials and traceable lot control for automotive BOM compliance.
AD7918BRUZ-REEL7 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:
- 10
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- 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:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7918BRUZ-REEL7 FAQ
1.How can I place an order for AD7918BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7918BRUZ-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 AD7918BRUZ-REEL7 reliable?
The price and inventory of AD7918BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7918BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7918BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7918BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7918BRUZ-REEL7?
AD7918BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7918BRUZ-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 AD7918BRUZ-REEL7?
For technical support, including AD7918BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7918BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7918BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7918BRUZ-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 AD7918BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7918BRUZ-REEL7?
All AD7918BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7918BRUZ-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 AD7918BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7918BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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