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Analog Devices Inc. AD7716BP
- Part No.:
- AD7716BP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AD7716BP.pdf
- Description:
- IC ADC 22BIT SIGMA-DELTA 44-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
AD7716BP from Analog Devices is a 4-channel, 22-bit sigma-delta analog-to-digital converter with on-chip digital filtering, designed for high-accuracy low-frequency signal acquisition in biomedical and instrumentation systems. It delivers 105 dB usable dynamic range at 146 Hz input bandwidth, ±2.5 V analog input range, and programmable filter cutoff frequencies from 36.5 Hz to 584 Hz. Its CASCIN/CASCOUT pins enable daisy-chained multichannel expansion.
For engineers reviewing the AD7716BP datasheet, AD7716BP pinout, AD7716BP application, or AD7716BP equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready procurement details - all grounded in Analog Devices' official AD7716BP datasheet (Rev. A) and ordering guide.
Technical Context
The AD7716BP integrates four independent second-order sigma-delta modulators with cascaded sinc³ digital filters, enabling simultaneous sampling across AIN1–AIN4 without channel switching artifacts. Each modulator operates at fCLKIN/14 = 570 kHz (at 8 MHz clock), feeding decimated 32-bit output words containing 22 data bits, 2 channel address bits, and 3 device address bits.
Filter cutoff is set via FC2–FC0 bits in the control register, yielding five discrete frequencies (36.5/73/146/292/584 Hz), each with linear-phase response, absolute group delay proportional to 2N, and guaranteed no-missed-codes to 21 bits at 146 Hz. The device supports both master mode (CLKOUT-driven crystal oscillator) and slave mode (external CLKIN), with RFS/SDATA/SCLK forming a five-line serial interface compatible with DSPs and microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 22-bit output word with guaranteed no-missed-codes to 21 bits at 146 Hz filter setting - ensures monotonicity for precision measurement applications. |
| Usable Dynamic Range | 111 dB at 36.5 Hz (full-scale sine wave vs. rms noise); enables detection of µV-level signals in seismic or ECG front ends. |
| Input Range | ±2.5 V differential input range referenced to AGND - matches standard precision op-amp output stages and eliminates need for external level-shifting. |
| Filter Cutoff Frequencies | Programmable at 36.5/73/146/292/584 Hz via FC2–FC0 bits - allows trade-off between noise floor (lower cutoff) and update rate (higher cutoff). |
| Power Consumption | 35 mW typical (7.5 mA IDD + 2.5 mA ISS at ±5 V supplies) - suitable for low-power portable instrumentation with thermal constraints. |
| Channel Isolation | –85 dB typical feedthrough between any active channel and the other three - critical for simultaneous multi-lead ECG acquisition without crosstalk. |
| Integral Nonlinearity | 0.003% FSR typical (0.006% max) - supports <1 ppm linearity error in high-accuracy weigh scales or calibration standards. |
Pinout & Package
AD7716BP is packaged in a 44-pin PLCC (Plastic Leaded Chip Carrier), designated P-44A in Analog Devices' ordering guide. Pin layout follows standard PLCC top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN4 | Analog Input Channels | Dedicated differential inputs accepting ±2.5 V full-scale; high-impedance (>1 GΩ) with 1 nA bias current - minimizes loading on sensor bridges or biopotential amplifiers. |
| A0–A2 | Device Address Inputs | Three binary address lines enabling up to 32 unique device addresses in cascaded systems - simplifies firmware addressing in 32-channel ECG machines. |
| CASCIN / CASCOUT | Cascade Control Interface | CASCIN is level-triggered enable for data stream; CASCOUT pulses high after full 4-channel transfer - enables deterministic synchronization across multiple AD7716BP devices without external logic. |
| SCLK / SDATA / TFS / RFS | Serial I/O Interface | Five-wire synchronous serial port supporting both master (CLKOUT-driven) and slave (external CLKIN) modes - directly interfaces to TI C5x/C6x DSPs and ARM Cortex-M SPI peripherals. |
| DOUT1 / DOUT2 | Programmable Digital Outputs | Two user-configurable outputs controlled by control register bits - used for front-end calibration sequencing (e.g., auto-zero switches in EEG front ends). |
| RESET | Global Synchronization Input | Active-high pulse resets digital interface and aligns sampling points across all four channels - essential for time-coherent multi-sensor acquisition in seismic arrays. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 4-channel conversion | Eliminates multiplexing-induced settling delays and inter-channel phase skew - enables true real-time waveform capture in 12-lead ECG systems. |
| sinc³ digital filter architecture | Provides >100 dB notch rejection at integer multiples of output rate (e.g., 278 Hz first notch at 73 Hz cutoff) - suppresses power-line harmonics without external analog filters. |
| Linear-phase group delay | Differential group delay <10 ns across bandwidth - preserves waveform fidelity in transient-sensitive applications like pacemaker pulse detection (via DIN1 flag). |
| Programmable filter cutoff | Five discrete settings (36.5–584 Hz) selected via 3-bit control register - allows runtime adaptation to varying signal bandwidths (e.g., EEG delta vs. gamma bands). |
| Integrated reference interface | VREF pin accepts 2.4–2.6 V external reference - supports high-stability buried-zener references (e.g., ADR441) for <0.5 ppm/°C system gain drift. |
Applications
| ECG Machine Front End | High-Accuracy Weigh Scale |
|---|---|
|
Use Scenario: Acquisition of 12-lead ECG signals with simultaneous sampling and pacemaker pulse detection. IC Role / Device Role / Timing Role: Primary 4-channel ADC handling leads I, II, III, and aVR; DIN1 flags pacemaker artifact presence in output stream. Use Value: 111 dB dynamic range at 36.5 Hz resolves microvolt-level ST-segment shifts; CASCIN/CASCOUT enables synchronized 12-lead capture using three AD7716BP devices. |
Use Scenario: Load cell readout in Class III legal-for-trade weighing instruments requiring <10 ppm linearity. IC Role / Device Role / Timing Role: Precision ADC interfacing to 350 Ω bridge sensors with programmable 146 Hz filter for optimal noise/speed balance. Use Value: 0.003% FSR integral nonlinearity and 0.5% FSR gain match between channels ensure repeatability across multiple load cells in multi-point calibration. |
| Seismic Data Logger | Process Control Transmitter |
|
Use Scenario: Low-noise acquisition of ground acceleration signals (0.1–100 Hz) in remote field deployments. IC Role / Device Role / Timing Role: Primary ADC for triaxial geophone inputs; RESET pin synchronizes start-of-acquisition across sensor axes. Use Value: –85 dB channel isolation prevents cross-axis coupling in vibration analysis; 35 mW power enables battery operation for >6 months at 100 Hz update rate. |
Use Scenario: 4–20 mA loop-powered transmitter measuring temperature, pressure, or flow with HART compatibility. IC Role / Device Role / Timing Role: High-resolution ADC digitizing RTD/thermocouple signals; DOUT1/DOUT2 control front-end calibration switches during HART burst mode. Use Value: Programmable 73 Hz filter achieves 108 dB dynamic range for sub-0.1°C temperature resolution; 50 kΩ internal pull-ups on SDATA simplify HART modem interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution multichannel sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7738BRUZ | 8-channel, 24-bit, 125 SPS max update rate; no CASCIN/CASCOUT; requires external clock only. | Better resolution but slower update rate; lacks native daisy-chain capability - needs FPGA or microcontroller coordination for multichannel sync. | Select when ultimate resolution (>115 dB) is prioritized over channel count and cascade simplicity. |
| ADS1258IPWR | 8-channel, 24-bit, 125 kSPS max; integrated PGA; SPI-only interface; no analog negative supply required. | Higher speed and integrated gain, but no built-in sinc³ notch filtering - requires external anti-aliasing for 50/60 Hz rejection. | Select for mixed-signal industrial I/O modules needing PGA flexibility and single-supply operation, not ultra-low-noise biomedical acquisition. |
Compared with AD7716BP, AD7738BRUZ offers higher resolution but sacrifices daisy-chain simplicity and real-time multichannel coherence, while ADS1258IPWR trades notch-filtered power-line rejection for speed and PGA integration - making AD7716BP uniquely suited for synchronized, low-noise, multi-device biomedical and seismic systems.
Availability
AD7716BP is available at Aetrix Electronics and suitable for ECG machine manufacturing, seismic data logging, high-accuracy weigh scale production, and process control transmitter design requiring stable component supply across extended product lifecycles.
Supply support for AD7716BP 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 AD7716BP belongs to Analog Devices' precision data acquisition IC family, engineered specifically for wide-dynamic-range, low-frequency measurement in medical, scientific, and industrial instrumentation where simultaneous multichannel integrity and ultra-low noise are critical.
FAQ
What is the maximum input bandwidth supported by the AD7716BP?
The AD7716BP supports a maximum input bandwidth of 584 Hz when configured with FC2–FC0 = 000 and fCLKIN = 8 MHz. This corresponds to the highest filter cutoff setting and yields 99 dB usable dynamic range. Bandwidth is reduced in discrete steps (292 Hz, 146 Hz, 73 Hz, 36.5 Hz) via control register programming - each step increases dynamic range and settling time while decreasing output update rate. The AD7716BP does not support bandwidths above 584 Hz.
Does the AD7716BP require an external crystal or can it operate with an external clock?
Yes, the AD7716BP supports both configurations. When MODE = low (master mode), a crystal is connected between CLKOUT and CLKIN to generate the internal master clock. When MODE = high (slave mode), an external clock is applied directly to CLKIN, and CLKOUT is left unconnected. The AD7716BP is production-tested at 8 MHz in slave mode and characterized to operate from 400 kHz to 8 MHz - no crystal is required in slave mode, simplifying board layout and reducing BOM count.
How does the CASCIN/CASCOUT functionality work in a multichannel system?
In a cascaded system, CASCIN is an active-high level-triggered input that enables the AD7716BP's output data stream. CASCOUT is a digital output that pulses high for one clock cycle at the end of a complete 4-channel data transfer (32-bit × 4). Connecting CASCOUT of Device 1 to CASCIN of Device 2 ensures Device 2 begins its data transmission immediately after Device 1 completes - enabling deterministic, glitch-free synchronization across up to 32 channels using only two dedicated pins per device.
What is the purpose of the DIN1 pin on the AD7716BP?
DIN1 is a digital input whose state is embedded in the 32-bit output word from the AD7716BP. In ECG systems, it is commonly used with an external pacemaker detection circuit: when a pacemaker pulse is detected, the circuit drives DIN1 high, causing the AD7716BP to flag the corresponding output word as invalid. This allows host firmware to discard or specially process data contaminated by large transient artifacts - a critical feature for clinical-grade arrhythmia analysis.
Can the AD7716BP operate from a single +5 V supply?
No, the AD7716BP requires dual analog supplies: AVDD = +5 V and AVSS = –5 V, along with DVDD = +5 V. The absolute maximum ratings specify AVSS must be between –4.75 V and –5.25 V, and AVDD–AVSS differential must not exceed 10 V. Using a single +5 V rail would violate the AVSS specification and prevent proper operation of the analog modulators. A dual-output DC/DC converter or split-rail LDO (e.g., ADP5070) is required for compliant operation.
AD7716BP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 22
- Sampling Rate (Per Second):
- 2.2k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 4
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7716BP FAQ
1.How can I place an order for AD7716BP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7716BP 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 AD7716BP reliable?
The price and inventory of AD7716BP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7716BP is usually 5 days.
3.What payment methods are accepted for AD7716BP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7716BP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7716BP?
AD7716BP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7716BP 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 AD7716BP?
For technical support, including AD7716BP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7716BP requirements.
6.How does Aetrix verify that AD7716BP is sourced from the original manufacturer or authorized distributors?
All AD7716BP 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 AD7716BP meets industry standards.
7.What is the process for return or replacement of AD7716BP?
All AD7716BP units undergo pre-shipment inspection (PSI). If there is an issue with AD7716BP, 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 AD7716BP part is unused and in its original packaging.
Return procedure for AD7716BP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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