My Inquiry
My Account
Analog Devices Inc. AD7918BRU
- Part No.:
- AD7918BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7918BRU.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,321
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7918BRU from Analog Devices is a 10-bit, 8-channel, successive approximation ADC with integrated channel sequencer, operating at up to 1 MSPS throughput, 2.7 V–5.25 V single-supply, and 20-lead TSSOP package. It features SPI/QSPI/MICROWIRE/DSP-compatible serial interface, 0 V to REFIN or 0 V to 2 × REFIN input range selection, and 6 mW max power dissipation at 3 V/1 MSPS - used in industrial data acquisition systems requiring multi-sensor sampling with low latency.
For engineers reviewing the AD7918BRU datasheet, AD7918BRU pinout, AD7918BRU application, or AD7918BRU equivalent, key selection considerations include its 10-bit resolution with ±0.5 LSB INL, sequencer-controlled 8-channel conversion, VDRIVE-independent logic interface, no pipeline delay, and automotive-qualified temperature range (−40°C to +125°C).
Technical Context
The AD7918BRU implements a standard SAR architecture with a track-and-hold amplifier supporting >8 MHz input bandwidth and 10 ns aperture delay. Conversion is initiated on the falling edge of CS, synchronized to SCLK, with fixed 16-cycle timing (800 ns max at 20 MHz SCLK) and no pipeline latency.
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), channel sequencing, and shutdown modes. The VDRIVE pin decouples logic-level compatibility (3 V or 5 V) from AVDD, enabling direct interfacing with mixed-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - guarantees monotonicity and no missing codes across full scale. |
| Throughput Rate | 1 MSPS - supports real-time sampling of eight channels at ≥125 kSPS per channel in sequenced mode. |
| SINAD @ 50 kHz | 61 dB min - enables accurate digitization of medium-bandwidth sensor signals (e.g., strain gauges, RTDs). |
| INL / DNL | ±0.5 LSB max / ±0.5 LSB max - ensures high linearity for precision measurement without calibration. |
| Power Dissipation | 6 mW max at 3 V/1 MSPS - suitable for battery-powered or thermally constrained embedded systems. |
| Input Range Options | 0 V to REFIN (2.5 V) or 0 V to 2 × REFIN (5 V) - selectable via RANGE bit for flexible signal scaling. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
AD7918BRU is housed in a 20-lead thin shrink small outline package (TSSOP) with exposed pad (not electrically connected), optimized for thermal performance and PCB space efficiency in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock input | Master clock for both data transfer and internal conversion timing; supports up to 20 MHz operation. |
| 2 (DIN) | Data input | Accepts 8-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 serial data 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. |
| 5, 6 (AVDD) | Analog power supply | Single 2.7 V–5.25 V supply powering analog core; requires local 10 µF + 100 nF decoupling. |
| 7 (REFIN) | Reference voltage input | Accepts external 2.5 V ±1% reference; sets full-scale range; high impedance (36 kΩ typical) eases driver design. |
| 9–16 (VIN0–VIN7) | Analog input channels | Eight single-ended inputs; internally multiplexed; unused channels must be tied to AGND to prevent noise coupling. |
| 18 (DOUT) | Serial data output | MSB-first stream: leading zero + 3-bit address + 10-bit result + two trailing zeros; tri-state controlled by CS. |
| 19 (VDRIVE) | Digital I/O supply | Defines logic thresholds (0.3×/0.7× VDRIVE); allows independent 3 V or 5 V interface regardless of AVDD. |
Key Features
| Feature | Design Value |
|---|---|
| Channel sequencer | Enables preprogrammed, automatic cycling through up to eight analog inputs without host intervention. |
| VDRIVE voltage independence | Permits direct connection to 3 V or 5 V microcontrollers even when AVDD = 2.7 V or 5.25 V - eliminates level shifters. |
| No pipeline delay | Guarantees deterministic, one-shot conversion latency (≤800 ns), critical for time-critical closed-loop control. |
| Flexible power management | Auto shutdown reduces current to 960 µA at 250 kSPS; full shutdown draws ≤0.5 µA - extends battery life. |
| Automotive qualification | Rated for −40°C to +125°C operation and qualified per AEC-Q100 - suitable for engine control, ADAS sensors. |
Applications
| Industrial Data Acquisition | Automotive Sensor Hub |
|---|---|
|
Use Scenario: Simultaneous monitoring of eight temperature, pressure, and current sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Central 10-bit SAR ADC performing sequenced conversions with deterministic 1 MSPS throughput and no pipeline latency. Use Value: Enables synchronized multi-channel sampling within a single 1 µs window, reducing inter-channel skew and simplifying firmware. |
Use Scenario: Aggregating signals from brake pressure, coolant temp, throttle position, and cabin air quality sensors in vehicle ECUs. IC Role / Device Role / Timing Role: Automotive-qualified ADC providing robust, high-SINAD digitization across extended temperature range. Use Value: Eliminates need for external level-shifting or sequencing logic while meeting AEC-Q100 reliability requirements. |
| Portable Test Equipment | Motor Control Feedback |
|
Use Scenario: Handheld multimeter or oscilloscope probe interface capturing analog waveforms with minimal power draw. IC Role / Device Role / Timing Role: Low-power 10-bit converter delivering 61 dB SINAD at 50 kHz with 6 mW consumption at 3 V. Use Value: Extends battery runtime without compromising measurement fidelity for field service tools. |
Use Scenario: Sampling phase currents and DC bus voltage in three-phase inverter drives for FOC algorithms. IC Role / Device Role / Timing Role: High-speed, low-latency ADC feeding real-time current/voltage feedback to DSP or MCU. Use Value: Supports precise current reconstruction at switching frequencies up to 20 kHz with sub-µs timing consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7928BRU | 12-bit resolution, 70 dB SINAD @ 50 kHz, same pinout/package, identical sequencer and interface logic. | Higher precision required for vibration analysis or high-resolution thermocouple measurement. | Select when system SNR budget demands >65 dB and 12-bit code granularity is essential. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface, 28-pin TSSOP, no built-in sequencer - requires external channel control. | Ultra-high precision, lower speed applications such as laboratory instrumentation or calibration standards. | Choose only if resolution >12 bits is mandatory and sequencer functionality can be implemented externally. |
Compared with AD7918BRU, AD7928BRU delivers higher resolution and dynamic range in identical hardware footprint, while ADS8325IPW trades speed and integration for ultimate precision - making AD7918BRU optimal for cost-sensitive, high-throughput 10-bit industrial sensing.
Availability
AD7918BRU is available at Aetrix Electronics and suitable for industrial automation, automotive sensor systems, and portable test equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for AD7918BRU 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 AD79xx family - including AD7918BRU - was designed specifically for high-speed, low-power, multi-channel data acquisition in space- and power-constrained embedded systems where deterministic timing and automotive-grade reliability are essential.
FAQ
What is the maximum sample rate achievable with AD7918BRU?
The AD7918BRU achieves a maximum throughput rate of 1 MSPS, corresponding to a minimum conversion time of 800 ns at 20 MHz SCLK. This rate applies to single-channel conversions; in sequenced 8-channel mode, the effective per-channel rate is 125 kSPS assuming continuous cycling. The timing is strictly governed by SCLK frequency and CS framing, with no pipeline delay affecting latency.
Does AD7918BRU require an external reference voltage?
Yes, AD7918BRU requires an external reference applied to the REFIN pin. The device is specified for 2.5 V ±1% reference voltage to ensure full accuracy - including ±0.5 LSB INL and 61 dB SINAD. REFIN has 36 kΩ input impedance and ±1 µA leakage, allowing use with low-output-impedance references or buffered sources without significant error.
Can AD7918BRU interface directly with a 3.3 V microcontroller while powered from 5 V AVDD?
Yes, AD7918BRU supports this configuration via the VDRIVE pin. When VDRIVE = 3.3 V and AVDD = 5 V, the digital interface (CS, SCLK, DIN, DOUT) operates at 3.3 V logic levels, while the analog core runs at 5 V - enabling seamless interfacing with 3.3 V MCUs without level shifters, and preserving full-scale input range (0 V to 2 × REFIN = 5 V).
How does the channel sequencer function in AD7918BRU?
The AD7918BRU sequencer is configured via the control register's SEQ and SHADOW bits. Once enabled, it automatically cycles through up to eight preselected VIN0–VIN7 channels in ascending order upon successive CS assertions. Each conversion result includes a 3-bit address prefix on DOUT, allowing unambiguous channel identification without host-side tracking - reducing CPU overhead in multi-sensor systems.
Is AD7918BRU suitable for automotive applications?
Yes, AD7918BRU is qualified for automotive applications per AEC-Q100, with guaranteed operation from −40°C to +125°C. Its specifications - including 61 dB SINAD, ±0.5 LSB INL, and 0.5 µA shutdown current - are validated across this extended temperature range. The 20-lead TSSOP package meets automotive board-level reliability requirements for vibration and thermal cycling.
AD7918BRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7918BRU FAQ
1.How can I place an order for AD7918BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7918BRU 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 AD7918BRU reliable?
The price and inventory of AD7918BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7918BRU is usually 5 days.
3.What payment methods are accepted for AD7918BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7918BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7918BRU?
AD7918BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7918BRU 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 AD7918BRU?
For technical support, including AD7918BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7918BRU requirements.
6.How does Aetrix verify that AD7918BRU is sourced from the original manufacturer or authorized distributors?
All AD7918BRU 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 AD7918BRU meets industry standards.
7.What is the process for return or replacement of AD7918BRU?
All AD7918BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7918BRU, 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 AD7918BRU part is unused and in its original packaging.
Return procedure for AD7918BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7918BRU Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
