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Analog Devices Inc. AD7918BRUZ
- Part No.:
- AD7918BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7918BRUZ.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:179
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Product details
Overview
AD7918BRUZ 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. It features 0.5 μA shutdown current, 6 mW power dissipation at 3 V/1 MSPS, and supports 0 V to REFIN or 0 V to 2 × REFIN input ranges in straight binary or twos complement coding - used in industrial data acquisition systems requiring multi-sensor sampling with minimal latency.
For engineers reviewing the AD7918BRUZ datasheet, AD7918BRUZ pinout, AD7918BRUZ application, or AD7918BRUZ equivalent, key selection considerations include its 10-bit resolution with ±0.5 LSB INL, sequenced 8-channel single-ended inputs, VDRIVE-independent logic interface, no pipeline delay, and automotive-qualified TSSOP-20 package for space-constrained embedded sensing.
Technical Context
The AD7918BRUZ employs a track-and-hold amplifier with 8.2 MHz full-power bandwidth and 50 ps aperture jitter, enabling accurate digitization of signals up to 50 kHz with ≥61 dB SINAD. Its conversion is initiated on the falling edge of CS and clocked by SCLK, requiring exactly 16 cycles per sample - eliminating pipeline latency and supporting deterministic timing in real-time control loops.
Configuration is managed via a 16-bit control register that sets input range (RANGE bit), output coding (CODING bit), sequencer mode (SEQ bit), and channel address (ADD2–ADD0). The VDRIVE pin decouples logic-level compatibility (3 V or 5 V) from AVDD, allowing direct interfacing with mixed-voltage microcontrollers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - guarantees monotonicity and no missing codes across full temperature range (−40°C to +85°C). |
| Throughput Rate | 1 MSPS maximum - enables sampling of eight channels at 125 kSPS each in sequenced mode. |
| SINAD @ 50 kHz | 61 dB min - ensures ≥9.8 effective number of bits (ENOB) for precision sensor signal conditioning. |
| INL / DNL | ±0.5 LSB max / ±0.5 LSB max - maintains linearity critical for closed-loop feedback accuracy. |
| Power Dissipation | 6 mW max at 3 V/1 MSPS - supports thermally constrained industrial modules and battery-backed systems. |
| Shutdown Current | 0.5 μA max - enables ultra-low-power sleep states between measurement bursts. |
| Input Range Options | 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V) - selectable via RANGE bit for flexible sensor scaling. |
Pinout & Package
AD7918BRUZ is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices Rev. E datasheet Figure 3 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock input | Master clock for both data transfer and internal ADC conversion timing; determines sample rate (fSCLK = 10 kHz–20 MHz). |
| 2 (DIN) | Data input | Accepts 16-bit control register writes on SCLK falling edge; configures sequencing, range, and coding. |
| 3 (CS) | Chip select (active low) | Initiates conversion on falling edge; frames SPI transactions; defines acquisition window start. |
| 4, 8, 17, 20 (AGND) | Analog ground | Common reference for all analog inputs, REFIN, and internal circuitry; must be star-connected to minimize noise coupling. |
| 5, 6 (AVDD) | Analog power supply | Single 2.7 V–5.25 V supply powering core ADC, T/H, and reference buffer; requires local 10 µF + 100 nF decoupling. |
| 7 (REFIN) | Reference input | Accepts external 2.5 V ±1% reference; sets full-scale range; high impedance (36 kΩ) demands low-noise source. |
| 9–16 (VIN0–VIN7) | Analog inputs | Eight single-ended channels; internally multiplexed; unused pins must tie to AGND to prevent noise pickup. |
| 18 (DOUT) | Data output | 3-wire SPI output: leading zero + 3-bit channel ID + 10-bit result + 2 trailing zeros (MSB first). |
| 19 (VDRIVE) | Digital I/O supply | Defines logic thresholds (0.3×/0.7× VDRIVE); independent of AVDD - enables 3 V MCU interfacing while AVDD = 5 V. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion completes in fixed 16-SCLK cycles with deterministic timing - essential for time-critical control applications. |
| VDRIVE voltage independence | Serial interface operates at 3 V or 5 V regardless of AVDD, eliminating level shifters in mixed-supply systems. |
| Programmable channel sequencer | Control register SEQ bit enables automatic cycling through preselected VIN0–VIN7 channels - reduces host processor overhead. |
| Flexible input range & coding | RANGE and CODING bits support 0–2.5 V or 0–5 V unipolar, or ±2.5 V bipolar (twos complement) - adapts to diverse sensor outputs. |
| Automotive qualification | Specified for −40°C to +125°C operation and qualified per AEC-Q100 - suitable for under-hood and infotainment subsystems. |
Applications
| Industrial Process Monitoring | Automotive Battery Management |
|---|---|
|
Use Scenario: Continuous monitoring of temperature, pressure, and current sensors across 8 PLC I/O modules. IC Role / Device Role / Timing Role: 10-bit ADC with sequencer acquires synchronized samples from 8 analog sensors every 125 µs, feeding real-time PID controllers. Use Value: 1 MSPS throughput and no pipeline delay ensure sub-100 ns timing jitter between channel conversions - critical for phase-aligned multi-sensor analysis. |
Use Scenario: Cell voltage and temperature sampling in 12S Li-ion battery packs for EV powertrain systems. IC Role / Device Role / Timing Role: AD7918BRUZ digitizes up to 8 cell voltages (0–5 V range) and thermistor outputs with 10-bit resolution and automotive-grade reliability. Use Value: VDRIVE pin allows direct connection to 3.3 V MCU while AVDD = 5 V for optimal SNR - simplifies BMS PCB layout and improves EMC robustness. |
| Medical Patient Monitoring | Test & Measurement Equipment |
|
Use Scenario: Multi-parameter vital sign acquisition (ECG, SpO₂, respiration) in portable patient monitors. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 biopotential channels using internal sequencer and low-noise T/H amplifier. Use Value: 61 dB SINAD at 50 kHz and 50 ps aperture jitter preserve diagnostic waveform fidelity - meets IEC 60601-2-27 requirements for ECG accuracy. |
Use Scenario: Channelized data logging in handheld oscilloscopes and multimeters with >100 kSPS per channel capability. IC Role / Device Role / Timing Role: High-speed ADC front-end capturing transient events across multiple test points with precise timestamp alignment. Use Value: 8.2 MHz full-power bandwidth and 300 ns acquisition time enable accurate capture of fast-rising pulses up to 100 ns duration. |
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 | 12-bit resolution, 70 dB SINAD, higher gain error (±1.5 LSB), same pinout and interface | Higher precision required (e.g., calibration equipment); increased code density demands more MCU processing | Select when ENOB > 11 bits is mandatory and system can accommodate larger data payloads and tighter layout tolerances. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface, 2.7–5.5 V supply, no built-in sequencer | Lower speed but higher resolution; requires external multiplexer and sequencer logic | Choose for static or slow-varying measurements where absolute accuracy outweighs channel count and speed. |
Compared with AD7918BRUZ, AD7928BRUZ delivers 2 extra bits at identical speed and footprint but increases system cost and data handling complexity; ADS8325IPW trades speed and integration for raw resolution, necessitating additional components and firmware overhead.
Availability
AD7918BRUZ is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, medical patient monitoring, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for AD7918BRUZ 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 Wilmington, MA.
The AD79xx family - including AD7918BRUZ - was designed for high-speed, low-power, multi-channel data acquisition in space- and power-constrained embedded systems, emphasizing deterministic timing, flexible interfacing, and automotive-grade reliability.
FAQ
What is the maximum sampling rate supported by the AD7918BRUZ?
The AD7918BRUZ supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK. At this rate, each 10-bit conversion completes in 800 ns (16 SCLK cycles), and the device consumes 6 mW at 3 V supply. This rate applies to single-channel operation; in sequenced 8-channel mode, the effective per-channel rate is 125 kSPS.
Does the AD7918BRUZ require an external reference voltage?
Yes, the AD7918BRUZ requires an external reference voltage applied to the REFIN pin. The datasheet specifies 2.5 V ±1% for guaranteed performance. The part does not include an internal reference; REFIN directly sets the full-scale input range (0 V to REFIN or 0 V to 2 × REFIN), and its impedance is 36 kΩ typical at 1 MSPS.
Can the AD7918BRUZ interface directly with a 3.3 V microcontroller while operating from a 5 V analog supply?
Yes. The VDRIVE pin allows independent configuration of the digital I/O voltage. When VDRIVE = 3.3 V and AVDD = 5 V, the AD7918BRUZ maintains 3.3 V logic thresholds (VINH = 2.31 V min, VINL = 0.99 V max) while delivering optimal analog performance - eliminating level shifters in mixed-voltage designs.
How does the channel sequencer function in the AD7918BRUZ?
The AD7918BRUZ 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 programmable subset of VIN0–VIN7 in ascending order upon consecutive CS assertions. Each conversion result includes a 3-bit channel ID in the DOUT stream, enabling unambiguous channel identification without host-side tracking.
Is the AD7918BRUZ suitable for automotive applications?
Yes. The AD7918BRUZ is qualified for automotive applications per AEC-Q100, with guaranteed operation from −40°C to +125°C. It features enhanced ESD protection (1.5 kV HBM), automotive-grade SINAD/SNR specifications, and thermal performance validated in TSSOP-20 packaging - making it appropriate for battery monitoring, engine control, and ADAS sensor interfaces.
AD7918BRUZ 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:
- 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 FAQ
1.How can I place an order for AD7918BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7918BRUZ 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 reliable?
The price and inventory of AD7918BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7918BRUZ is usually 5 days.
3.What payment methods are accepted for AD7918BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7918BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7918BRUZ?
AD7918BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7918BRUZ 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?
For technical support, including AD7918BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7918BRUZ requirements.
6.How does Aetrix verify that AD7918BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7918BRUZ 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 meets industry standards.
7.What is the process for return or replacement of AD7918BRUZ?
All AD7918BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7918BRUZ, 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 part is unused and in its original packaging.
Return procedure for AD7918BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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