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Analog Devices Inc. AD7715ANZ-3
- Part No.:
- AD7715ANZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7715ANZ-3.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
AD7715ANZ-3 from Analog Devices is a 16-bit sigma-delta analog-to-digital converter optimized for low-frequency, high-accuracy sensor signal acquisition. It integrates a programmable-gain amplifier (gains 1/2/32/128), differential input and reference inputs, on-chip digital filtering, and a three-wire SPI-compatible serial interface. Operating at 3 V with ≤450 µA total supply current, it delivers 16-bit no-missing-codes performance and ±0.0015% integral nonlinearity for precision pressure and temperature measurement systems.
For engineers reviewing the AD7715ANZ-3 datasheet, AD7715ANZ-3 pinout, AD7715ANZ-3 application, or AD7715ANZ-3 equivalent, key selection considerations include its 3 V operation, differential input capability, programmable filter notch (20 Hz to 60 Hz), unipolar/bipolar input range support (±20 mV to ±2.5 V), and self-calibration functionality for offset/gain drift compensation in industrial transmitters.
Technical Context
The AD7715ANZ-3 employs a charge-balancing sigma-delta modulator with an on-chip digital filter whose first notch frequency is software-programmable via register control - enabling precise rejection of 50 Hz or 60 Hz line interference. Its analog front end includes a fully differential PGA and optional input buffer, allowing direct connection to low-level transducer outputs without external amplification.
It supports both unipolar (0 mV to 20 mV, 0 V to 2.5 V) and bipolar (±20 mV, ±2.5 V) input ranges referenced to AGND, with common-mode rejection >90 dB at DC and >150 dB at 50/60 Hz when configured with appropriate filter notches. The device uses separate analog (AVDD) and digital (DVDD) 3 V supplies and features system calibration modes that eliminate zero-scale and full-scale errors in-situ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no missing codes - guarantees monotonicity and full code coverage across all operating conditions. |
| Integral Nonlinearity | ±0.0015% of FSR - ensures high-end accuracy for calibrated industrial sensor interfaces. |
| Supply Current | ≤450 µA at 3 V, 1 MHz MCLK - enables battery-powered or energy-constrained embedded systems. |
| Input Ranges | ±20 mV, ±80 mV, ±1.25 V, ±2.5 V (bipolar); 0–20 mV, 0–80 mV, 0–1.25 V, 0–2.5 V (unipolar) - matches common strain gauge, RTD, and thermocouple output levels. |
| Power-Down Current | 10 µA typical - reduces standby power in intermittent-sampling applications like smart sensors. |
| 50/60 Hz Rejection | 98 dB normal-mode, 150 dB common-mode - eliminates mains interference without external notch filters. |
| Reference Voltage | 1.25 V nominal (REF IN(+) − REF IN(−)) - optimized for low-voltage 3 V operation with internal gain scaling. |
Pinout & Package
AD7715ANZ-3 is housed in a 16-lead plastic dual-in-line package (PDIP), 0.3 inch wide, with lead finish compatible with standard SnPb and RoHS-compliant reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCLK) | Serial clock input | Controls timing of data transfer on DIN/DOUT; supports SPI/QSPI/MICROWIRE/DSP protocols. |
| 2 (MCLK IN) | Master clock input | Accepts 400 kHz–2.4576 MHz crystal or CMOS clock; drives internal sigma-delta modulator and filter. |
| 3 (MCLK OUT) | Master clock output | Drives external crystal/resonator when used in oscillator mode; left open if external clock applied to MCLK IN. |
| 4 (CS) | Chip select | Active-low enable for serial interface; allows multiple devices on shared SCLK/DIN/DOUT bus. |
| 5 (REF IN(+)) | Positive reference input | Accepts 1.25 V reference for 3 V operation; defines full-scale range with REF IN(−). |
| 6 (AGND) | Analog ground | Return path for analog circuitry; must be separated from DGND to minimize noise coupling. |
| 7 (DRDY) | Data ready output | Active-low flag indicating valid conversion result available in data register. |
| 8 (RESET) | Hardware reset input | Asynchronous active-low reset; initializes registers and clears calibration status. |
| 9 (AVDD) | Analog supply | +3 V supply for PGA, modulator, and analog filter; requires local decoupling to AGND. |
| 10 (AIN(+)) | Differential analog input (+) | High-impedance input (1 nA bias) accepting buffered or unbuffered transducer signals. |
| 11 (AIN(–)) | Differential analog input (–) | Completes differential pair; sets common-mode reference point for bipolar/unipolar ranges. |
| 12 (REF IN(–)) | Negative reference input | Connected to AGND for standard operation; establishes reference midpoint for 1.25 V reference. |
| 13 (DGND) | Digital ground | Return path for digital I/O and logic; connected to AGND at single point near AVDD/DVDD decoupling. |
| 14 (DVDD) | Digital supply | +3 V supply for serial interface and digital logic; independent from AVDD for noise isolation. |
| 15 (DIN) | Serial data input | Writes configuration data (setup, communications, test registers) during write cycles. |
| 16 (DOUT) | Serial data output | Reads conversion results and register contents; tri-state when CS is high. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gain front end | Gains of 1, 2, 32, and 128 eliminate need for external signal conditioning amplifiers when interfacing millivolt-level transducers. |
| Differential analog and reference inputs | Rejects common-mode noise up to 150 dB at 50/60 Hz, enabling reliable measurements in electrically noisy industrial environments. |
| On-chip self- and system-calibration | Removes offset and gain errors without external calibration hardware; recalibration compensates for temperature-induced drift. |
| Three-wire serial interface | Reduces interconnect count and optocoupler requirements in isolated systems, simplifying microcontroller integration. |
| Low-power 3 V operation | 450 µA max supply current and 10 µA standby current support long-life battery operation in portable instrumentation. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
|
Use Scenario: High-resolution pressure sensing in HVAC controllers using silicon piezoresistive bridges with mV-level output. IC Role / Device Role / Timing Role: ADC front end performing gain-scaling, noise filtering, and digitization of bridge differential voltage. Use Value: 16-bit resolution and 98 dB 50/60 Hz rejection enable stable sub-0.1%FS pressure readings without external anti-aliasing or notch filters. |
Use Scenario: Precision RTD-based temperature monitoring in industrial process control cabinets with ambient EMI. IC Role / Device Role / Timing Role: Signal conditioner and converter for 3-wire PT100/PT1000 configurations with ratiometric reference. Use Value: Programmable gain and bipolar input range support direct connection to RTD excitation circuits; ±0.0015% INL ensures traceable calibration compliance. |
| Smart Transmitter | Strain Gauge Interface |
|
Use Scenario: 4–20 mA loop-powered field transmitter for flow or level sensing with HART communication capability. IC Role / Device Role / Timing Role: Primary ADC converting sensor output while sharing DVDD with microcontroller and HART modem. Use Value: 3 V operation and 450 µA supply current allow full functionality within 3.5 mA loop budget; self-calibration maintains accuracy over 10+ year service life. |
Use Scenario: Load cell readout in weigh scales where microvolt-level Wheatstone bridge outputs require high gain and low drift. IC Role / Device Role / Timing Role: Charge-balancing ADC with 128× PGA gain and 20 Hz filter notch for stable low-frequency weight capture. Use Value: 0.2 µV/°C bipolar zero drift and on-chip system calibration reduce thermal zero shift to <0.01%FS/°C without manual trim. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714BN | 16-bit, 5 V only, higher supply current (600 µA), fixed 2.5 V reference, no 3 V option | Suitable for legacy 5 V systems; lacks 3 V compatibility and lower power profile of AD7715ANZ-3 | Select AD7715ANZ-3 for new 3 V designs requiring lower power and flexible reference voltage. |
| ADS124S08IPW | 24-bit, integrated PGA, 3 V operation, SPI interface, but requires external reference and lacks on-chip system calibration | Better resolution for ultra-high-precision applications; higher BOM cost and design complexity due to external reference and calibration firmware | Choose AD7715ANZ-3 when 16-bit resolution suffices and on-chip calibration simplifies firmware development and field maintenance. |
Compared with AD7714BN, AD7715ANZ-3 enables lower-power 3 V operation and built-in 1.25 V reference scaling; compared with ADS124S08IPW, it trades resolution for integrated calibration and simpler system-level validation in industrial transmitters.
Availability
AD7715ANZ-3 is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, smart transmitter, and strain gauge interface applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for AD7715ANZ-3 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 AD7715 belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy industrial sensor signal conditioning in harsh electromagnetic environments.
FAQ
What is the maximum master clock frequency supported by the AD7715ANZ-3?
The AD7715ANZ-3 is specified for master clock frequencies from 400 kHz to 2.4576 MHz. It is production-tested at 2.4576 MHz and guaranteed by characterization down to 400 kHz. Operation outside this range may compromise conversion accuracy, noise performance, or calibration stability. For optimal 16-bit no-missing-codes behavior, use 1 MHz or 2.4576 MHz as recommended in the datasheet.
Does the AD7715ANZ-3 support both unipolar and bipolar input configurations?
Yes, the AD7715ANZ-3 supports both unipolar (0 mV to 20 mV, 0 V to 2.5 V) and bipolar (±20 mV, ±2.5 V) input ranges. Configuration is controlled via the B/U bit in the setup register. Bipolar ranges are referenced to AIN(–), enabling true differential measurement of AC-coupled or centered sensor outputs without external level-shifting circuitry.
How does the AD7715ANZ-3 handle power supply rejection at 50 Hz and 60 Hz?
The AD7715ANZ-3 achieves >120 dB power supply rejection at 50 Hz and 60 Hz when configured with appropriate digital filter notches (e.g., 25 Hz or 50 Hz for 50 Hz rejection). This performance is enabled by its sigma-delta architecture and programmable notch filter, eliminating the need for external RC filters or dedicated PSRR-enhancing components in noisy plant-floor environments.
Can the AD7715ANZ-3 operate with an external reference voltage other than 1.25 V?
No - the AD7715ANZ-3 is characterized and specified for 1.25 V reference input (REF IN(+) − REF IN(−)) under 3 V supply conditions. Using a different reference voltage violates the datasheet's operating conditions and may degrade INL, noise, or gain accuracy. For 2.5 V reference operation, the AD7715-5 variant must be selected instead.
What is the purpose of the buffer (BUF) bit in the AD7715ANZ-3 setup register?
The BUF bit enables or disables the internal analog input buffer. When set, the buffer provides high input impedance (>1 GΩ) and isolates the modulator from source impedance variations, improving accuracy with high-Z sensors like thermocouples. When cleared, the device draws only 1 nA input bias current but requires source impedance <2 kΩ to maintain specified INL and drift performance.
AD7715ANZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7715ANZ-3 FAQ
1.How can I place an order for AD7715ANZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7715ANZ-3 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 AD7715ANZ-3 reliable?
The price and inventory of AD7715ANZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7715ANZ-3 is usually 5 days.
3.What payment methods are accepted for AD7715ANZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7715ANZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7715ANZ-3?
AD7715ANZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7715ANZ-3 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 AD7715ANZ-3?
For technical support, including AD7715ANZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7715ANZ-3 requirements.
6.How does Aetrix verify that AD7715ANZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7715ANZ-3 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 AD7715ANZ-3 meets industry standards.
7.What is the process for return or replacement of AD7715ANZ-3?
All AD7715ANZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7715ANZ-3, 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 AD7715ANZ-3 part is unused and in its original packaging.
Return procedure for AD7715ANZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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