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Analog Devices Inc. AD7718BRZ
- Part No.:
- AD7718BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7718BRZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
AD7718BRZ from Analog Devices is a 24-bit Σ-Δ analog-to-digital converter (ADC) with integrated programmable gain amplifier (PGA), rail-to-rail input buffers, and dual 10-channel analog multiplexer configuration (8 pseudo-differential or 4 fully differential inputs). It delivers up to 18 bits peak-to-peak resolution at ±2.56 V range with 20 Hz update rate (CHOP = 0), supports simultaneous 50/60 Hz rejection, and operates from single 3 V or 5 V supply - used in high-accuracy industrial sensor signal conditioning for pressure transducers and smart transmitters.
For engineers reviewing the AD7718BRZ datasheet, AD7718BRZ pinout, AD7718BRZ application, or AD7718BRZ equivalent, key selection considerations include its 24-bit resolution with factory calibration, software-programmable output data rate (5.4–105 Hz in chop mode), VREF Select™ capability for ratiometric/absolute measurement, and pin compatibility with the 16-bit AD7708BRZ for resolution upgrade paths.
Technical Context
The AD7718BRZ implements a chopper-stabilized Σ-Δ modulator with on-chip PLL driven by a 32.768 kHz crystal, generating internal clocking for precise low-frequency measurement. Its dual reference inputs (REFIN1/REFIN2) support flexible ratiometric or absolute configurations, and the 2-bit digital I/O port enables auxiliary control without external GPIO.
Signal chain operation is configurable via CHOP mode: CHOP = 0 optimizes analog performance (100 dB CMR @ DC, 110 dB @ 50/60 Hz), while CHOP = 1 prioritizes throughput (up to 1.365 kHz update rate in non-chop mode). The PGA offers gain settings from 1 to 128, enabling direct conversion of signals from 20 mV to 2.56 V full-scale without external amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes; 18 bits peak-to-peak at ±2.56 V, 20 Hz update (CHOP = 0) |
| Input Channels | 10-pin-configurable analog inputs: supports 8 pseudo-differential or 4 fully differential channels |
| PGA Gain Range | 1× to 128×; enables direct digitization of microvolt-level sensor outputs (e.g., 20 mV full-scale) |
| Power Supply | Single 3 V or 5 V supply; 1.28 mA typical current at 3 V (normal mode) |
| AC Rejection | 100 dB simultaneous 50 Hz and 60 Hz normal-mode rejection at SF Word = 68/82 |
| Reference Flexibility | VREF Select™ allows use of internal 2.5 V reference or external reference (1 V to AVDD) |
| Output Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible serial interface with Schmitt-triggered SCLK |
Pinout & Package
The AD7718BRZ is housed in a 28-lead SOIC package (R-28) with exposed pad thermal enhancement. Pin functions are defined per Analog Devices' official pin configuration diagram (Rev. 0, p.13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN10 | Configurable analog input | Each can serve as pseudo-differential input with AINCOM or as differential pair (e.g., AIN1+/AIN2−); two pins double as REFIN2(±) |
| REFIN1(±), REFIN2(±) | Dual reference inputs | Independent reference pairs allow mixed ratiometric/absolute measurement; REFIN2(±) shares pins with AIN9/AIN10 |
| AVDD, AGND, DVDD, DGND | Analog/digital power & ground | Separate analog/digital supplies enable noise isolation; AGND–DGND differential ≤ ±50 mV required |
| DOUT, DIN, SCLK, CS, RDY | Serial interface signals | 3-wire SPI-compatible interface; RDY indicates data ready; Schmitt-trigger on SCLK improves noise immunity |
| P1, P2 | Digital I/O port | 2-bit general-purpose output port; configured via I/O Control Register for system-level control signaling |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated 24-bit Σ-Δ ADC | Eliminates need for user system calibration; INL ≤ ±10 ppm FSR, offset error ≤ ±3 µV (CHOP = 0) |
| Programmable CHOP mode | CHOP = 0 maximizes noise performance (110 dB CMR @ 50/60 Hz); CHOP = 1 increases throughput (1.365 kHz max) |
| VREF Select™ architecture | Enables seamless switching between ratiometric (sensor excitation referenced to REFIN) and absolute (fixed 2.5 V reference) measurement modes |
| Rail-to-rail input buffer + PGA | Supports direct connection of low-output sensors (e.g., bridge transducers) without external signal conditioning circuitry |
| Simultaneous 50/60 Hz rejection | Hardware-based notch filtering at both line frequencies using programmable filter word (SF = 68 or 82) |
Applications
| Industrial Process Control | Portable Instrumentation |
|---|---|
Use Scenario: High-precision monitoring of temperature, flow, and level in distributed PLC I/O modules. IC Role / Device Role / Timing Role: Front-end ADC digitizing 4–20 mA loop signals and RTD/thermocouple outputs with galvanic isolation. Use Value: 24-bit resolution and 100 dB 50/60 Hz rejection ensure stable readings in electrically noisy plant-floor environments. | Use Scenario: Battery-powered handheld multimeters and environmental data loggers requiring low power and high accuracy. IC Role / Device Role / Timing Role: Low-power ADC capturing sensor data (pressure, humidity) with on-demand sampling and auto power-down between conversions. Use Value: 30 µA power-down current (32 kHz crystal running) extends battery life; CHOP mode balances resolution vs. speed for optimal energy efficiency. |
| Smart Transmitters | Pressure Transducers |
Use Scenario: HART-enabled field devices transmitting calibrated process variables over 4–20 mA with digital diagnostics. IC Role / Device Role / Timing Role: Primary ADC converting sensor output while supporting VREF Select™ for ratiometric excitation of strain-gauge bridges. Use Value: Dual reference inputs (REFIN1/REFIN2) allow independent excitation and measurement references, improving long-term stability and TUE < 0.01% FSR. | Use Scenario: OEM integration of MEMS or piezoresistive pressure sensors into medical or HVAC systems. IC Role / Device Role / Timing Role: Signal conditioner ADC with integrated PGA gain scaling (1–128×) matching sensor full-scale output (e.g., 20–100 mV). Use Value: Direct digitization eliminates external op-amp stages, reducing BOM count, layout area, and thermal drift errors. |
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 | 16-bit resolution, same pinout and register map; lower peak-to-peak resolution (16 bits p-p vs. 18 bits p-p), identical CHOP modes and interface | Lower-cost option where 16-bit resolution suffices; suitable for less demanding instrumentation or cost-sensitive volume production | Select AD7708BRZ when system SNR requirements are ≤ 98 dB and full 24-bit data path is unnecessary |
| ADS1256IDBT | 24-bit delta-sigma ADC with 30 kSPS max, integrated oscillator, but no dual reference inputs or VREF Select™; different pinout and register structure | Higher-speed applications needing >100 Hz updates; lacks simultaneous 50/60 Hz rejection and ratiometric flexibility of AD7718BRZ | Choose ADS1256IDBT only if throughput >105 Hz is mandatory and dual-reference operation is not required |
Compared with AD7708BRZ, the AD7718BRZ provides 8 additional bits of resolution and enhanced noise rejection, while ADS1256IDBT trades ratiometric flexibility and line-frequency rejection for higher speed - making AD7718BRZ uniquely suited for precision industrial transducer interfaces requiring long-term stability and AC noise immunity.
Availability
AD7718BRZ is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and smart transmitter designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7718BRZ 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 AD7718BRZ belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy measurement applications including sensor front-ends, industrial automation, and portable test equipment.
FAQ
What is the maximum update rate of the AD7718BRZ in non-chop mode?
The AD7718BRZ achieves a maximum output update rate of 1.365 kHz in non-chop (CHOP = 1) mode, optimized for channel throughput. This setting reduces noise rejection performance compared to chop mode but enables faster scanning across multiple analog inputs in multiplexed systems.
Does the AD7718BRZ require an external crystal oscillator?
Yes, the AD7718BRZ requires a 32.768 kHz crystal connected between XTAL1 and XTAL2 pins. An on-chip PLL uses this crystal to generate the internal operating frequency; no external clock source or oscillator IC is needed beyond the crystal itself.
Can the AD7718BRZ measure both ratiometric and absolute voltage simultaneously?
No - the AD7718BRZ supports either ratiometric or absolute measurement per conversion cycle via VREF Select™, but not simultaneously. However, its dual reference inputs (REFIN1 and REFIN2) allow rapid reconfiguration between modes under software control without hardware change.
What is the purpose of the P1 and P2 pins on the AD7718BRZ?
The P1 and P2 pins form a 2-bit digital I/O port configurable as general-purpose outputs via the I/O Control Register. They can drive LEDs, enable/disable external circuitry, or signal status conditions - eliminating need for additional GPIO expanders in space-constrained designs.
How does the AD7718BRZ handle offset and gain errors over temperature?
The AD7718BRZ specifies offset error drift of ±10 nV/°C (CHOP = 0) and gain drift of ±0.5 ppm/°C. These low drift values, combined with on-chip self-calibration and system calibration registers, enable stable performance across –40°C to +85°C without external trimming components.
AD7718BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7718BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7718BRZ 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 reliable?
The price and inventory of AD7718BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7718BRZ is usually 5 days.
3.What payment methods are accepted for AD7718BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7718BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7718BRZ?
AD7718BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7718BRZ 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?
For technical support, including AD7718BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7718BRZ requirements.
6.How does Aetrix verify that AD7718BRZ is sourced from the original manufacturer or authorized distributors?
All AD7718BRZ 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 meets industry standards.
7.What is the process for return or replacement of AD7718BRZ?
All AD7718BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7718BRZ, 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 part is unused and in its original packaging.
Return procedure for AD7718BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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