My Inquiry
My Account
Analog Devices Inc. AD7718BRZ-REEL
- Part No.:
- AD7718BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7718BRZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7718BRZ-REEL from Analog Devices is a 24-bit Σ-Δ analog-to-digital converter (ADC) with integrated programmable-gain amplifier (PGA), 10-channel pseudo-differential or 5-channel fully-differential input capability, on-chip 32.768 kHz crystal oscillator and PLL, and 3-wire SPI-compatible serial interface. It operates from single 3 V or 5 V supplies and delivers up to 18 bits peak-to-peak resolution at ±2.56 V input range with 20 Hz update rate in chop mode - ideal for high-precision industrial sensor signal acquisition.
For engineers reviewing the AD7718BRZ-REEL datasheet, AD7718BRZ-REEL pinout, AD7718BRZ-REEL application, or AD7718BRZ-REEL equivalent, key selection considerations include its 24-bit resolution with no missing codes, simultaneous 50/60 Hz rejection, VREF Select™ for ratiometric/absolute measurement flexibility, CHOP mode optimization for noise reduction, and pin compatibility with the 16-bit AD7708 for scalable system design.
Technical Context
The AD7718BRZ-REEL implements a sigma-delta modulation architecture with digital filtering, supporting both chop-enabled (CHOP = 0) and non-chop (CHOP = 1) operation modes. Its on-chip PGA offers gain settings from 1 to 128, enabling direct conversion of low-level transducer signals (e.g., 20 mV full-scale) without external amplification.
It features dual reference inputs (REFIN1/REFIN2), configurable as either reference sources or additional analog inputs (AIN9/AIN10), and includes a 2-bit digital I/O port. The device uses an internal PLL driven by a 32.768 kHz crystal to generate required clock frequencies, eliminating need for external high-frequency clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes; supports 13–18 bits peak-to-peak depending on gain and output data rate |
| Input Channels | 10 pseudo-differential or 5 fully-differential inputs; AIN1–AIN8 plus REFIN2(±) usable as AIN9/AIN10 |
| Update Rate Range | 5.4 Hz to 1.365 kHz; software-programmable via filter register |
| Simultaneous Rejection | ≥100 dB at both 50 Hz and 60 Hz with single configuration (SF Word = 68/82) |
| Power Consumption | 1.28 mA typical @ 3 V (normal mode); 30 µA @ 3 V with 32.768 kHz oscillator running (power-down) |
| Reference Flexibility | VREF Select™ enables absolute (fixed 2.5 V ref) or ratiometric (sensor excitation-derived ref) measurement |
| Operating Supply | Single 2.7–3.6 V or 4.75–5.25 V AVDD/DVDD; supplies can be operated independently |
Pinout & Package
AD7718BRZ-REEL is housed in a 28-lead SOIC package (R-28), RoHS-compliant and tape-and-reel packaged per "-REEL" suffix. Pin functions are validated per Analog Devices AD7708/AD7718 Rev. 0 datasheet, Section "PIN FUNCTION DESCRIPTIONS".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Programmable-gain inputs configurable as pseudo-differential (vs. AINCOM) or fully-differential pairs (e.g., AIN1+/AIN2−) |
| AINCOM | Common-mode reference node | Return for pseudo-differential inputs; voltage range: AGND −30 mV to AVDD +30 mV (NEGBUF = 0) |
| REFIN1(±), REFIN2(±) | Dual reference/analog input terminals | REFIN1(+) and REFIN1(−) form primary reference; REFIN2(+) and REFIN2(−) double as AIN9/AIN10 when not used as reference |
| AVDD, AGND | Analog power domain | Separate analog supply and ground; required for PGA, ADC core, and reference circuitry |
| DVDD, DGND | Digital power domain | Independent digital supply; allows level-shifting between analog and digital sections |
| DIN, DOUT, SCLK, CS, RDY | 3-wire serial interface | SPI/QSPI/MICROWIRE-compatible; Schmitt-triggered SCLK; RDY indicates data ready |
| XTAL1/XTAL2 | Crystal oscillator terminals | Accepts 32.768 kHz tuning-fork crystal; internal buffer eliminates external components |
| P1/P2 | Configurable digital I/O | 2-bit bidirectional port; programmable direction and state via I/O Control Register |
Key Features
| Feature | Design Value |
|---|---|
| 24-bit Σ-Δ ADC with PGA | Enables direct digitization of microvolt-level sensor outputs (e.g., load cells, RTDs) without external signal conditioning |
| Simultaneous 50/60 Hz rejection | Eliminates need for external notch filters or software-based digital filtering in AC-line-noise-prone industrial environments |
| VREF Select™ architecture | Allows same hardware to support both ratiometric (e.g., bridge sensors) and absolute (e.g., thermocouple with cold-junction compensation) measurement topologies |
| Chop mode (CHOP = 0) | Reduces 1/f noise and offset drift - delivers 13–18 bits p-p resolution at 20 Hz update rate with <10 nV/°C offset drift |
| Factory-calibrated performance | Guarantees ±10 ppm INL and ±10 µV full-scale error after self-calibration; reduces system calibration overhead |
| Pin-for-pin upgrade path | Direct replacement for AD7708BRZ-REEL (16-bit version) - enables resolution scaling without PCB redesign |
Applications
| Industrial Process Monitoring | Portable Precision Instrumentation |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow in chemical plant PLC I/O modules. IC Role / Device Role / Timing Role: Primary front-end ADC acquiring multiplexed 4–20 mA loop signals and RTD/thermocouple inputs with 50/60 Hz line rejection. Use Value: 24-bit resolution and built-in chopping enable <0.01% FSR accuracy over temperature without recalibration - reducing field maintenance cycles. | Use Scenario: Battery-powered handheld multimeter or calibrator requiring high DC accuracy and low power. IC Role / Device Role / Timing Role: Core measurement engine handling multiple sensor types (voltage, current, resistance) with auto-ranging via PGA gain control. Use Value: 30 µA power-down current with active crystal allows fast wake-up (<1 ms) and long battery life while maintaining timing integrity for timestamped measurements. |
| Smart Sensor Transmitters | Programmable Logic Controller (PLC) Analog Input Modules |
Use Scenario: 2-wire HART-enabled transmitter converting sensor output to digital for loop communication. IC Role / Device Role / Timing Role: High-accuracy ADC with integrated reference and digital I/O (P1/P2) for HART modem control and diagnostics. Use Value: Dual reference inputs (REFIN2 as AIN9/AIN10) allow simultaneous measurement of sensor and supply rail - enabling real-time health monitoring without extra components. | Use Scenario: Modular PLC backplane with hot-swappable analog input cards for factory automation. IC Role / Device Role / Timing Role: Channelized ADC managing up to 10 differential inputs per card, synchronized via RDY and CS for deterministic sampling. Use Value: 3-wire SPI interface with RDY handshake ensures reliable data capture across variable bus loading and EMI conditions in noisy industrial cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7708BRZ-REEL | 16-bit resolution; identical pinout, package, and register map; lower power (0.43 mA typ @ 3 V) | Lower precision requirements (e.g., 0.1% FSR systems); cost-sensitive designs where 24-bit resolution is unnecessary | Select when system accuracy budget permits 16-bit performance and lower BOM cost is prioritized |
| ADS1256IPW | 24-bit, 30 kSPS max; separate external clock required; no on-chip oscillator or 50/60 Hz rejection firmware | High-speed data acquisition (e.g., dynamic strain measurement); designs with existing high-frequency clock infrastructure | Select when higher throughput (>1.365 kHz) is needed and external clock management is acceptable |
Compared with AD7708BRZ-REEL, the AD7718BRZ-REEL adds 8-bit resolution and enhanced noise rejection but increases power by ~0.85 mA; versus ADS1256IPW, it trades raw speed for integrated anti-aliasing, line-frequency rejection, and simplified clocking - reducing system-level design effort in static-sensor applications.
Availability
AD7718BRZ-REEL is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, smart transmitter design, and PLC analog input modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for AD7718BRZ-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 Wilmington, MA.
The AD7718BRZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy measurement applications including industrial sensors, weigh scales, and analytical instrumentation where noise, drift, and line-frequency interference must be rigorously controlled.
FAQ
What is the maximum achievable peak-to-peak resolution of the AD7718BRZ-REEL?
The AD7718BRZ-REEL achieves up to 18 bits peak-to-peak resolution at ±2.56 V input range with 20 Hz update rate in chop mode (CHOP = 0), and 13 bits p-p at the same range with 1.365 kHz update rate in non-chop mode. Resolution varies with programmed gain, output data rate, and input range - values are specified in the AD7718 section of the AD7708/AD7718 datasheet Rev. 0, Tables on pages 3–4.
Does the AD7718BRZ-REEL require an external crystal oscillator?
No, the AD7718BRZ-REEL integrates a crystal input buffer and PLL that accept a standard 32.768 kHz tuning-fork crystal directly on XTAL1/XTAL2 pins. No external oscillator IC or clock generator is needed - the internal PLL derives all required internal clocks, simplifying layout and reducing BOM count.
Can the AD7718BRZ-REEL measure both ratiometric and absolute voltage signals in the same system?
Yes, the AD7718BRZ-REEL implements VREF Select™, allowing dynamic selection between ratiometric measurement (using sensor excitation voltage as reference) and absolute measurement (using a stable 2.5 V internal reference). This is configured via the VREF bit in the Mode Register, enabling flexible sensor interfacing without hardware changes.
What is the purpose of the P1 and P2 pins on the AD7718BRZ-REEL?
The P1 and P2 pins on the AD7718BRZ-REEL form a 2-bit configurable digital I/O port. Their direction (input/output) and logic state are controlled via the I/O Control Register. They can be used for HART modem control, status indication, or general-purpose interfacing - extending system functionality without requiring external GPIO expanders.
Is the AD7718BRZ-REEL pin-compatible with any other Analog Devices ADCs?
Yes, the AD7718BRZ-REEL is pin-for-pin compatible with the AD7708BRZ-REEL (16-bit version). Both share identical 28-lead SOIC packaging, register map, pin functions, and timing - enabling seamless resolution upgrades in existing designs without PCB modifications or firmware rewrites.
AD7718BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 1.37k
- Number of Inputs:
- 4/5, 8/10
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7718BRZ-REEL FAQ
1.How can I place an order for AD7718BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7718BRZ-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 AD7718BRZ-REEL reliable?
The price and inventory of AD7718BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7718BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7718BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7718BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7718BRZ-REEL?
AD7718BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7718BRZ-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 AD7718BRZ-REEL?
For technical support, including AD7718BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7718BRZ-REEL requirements.
6.How does Aetrix verify that AD7718BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7718BRZ-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 AD7718BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7718BRZ-REEL?
All AD7718BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7718BRZ-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 AD7718BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7718BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7718BRZ-REEL 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…
