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Analog Devices Inc. AD7884BPZ
- Part No.:
- AD7884BPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AD7884BPZ.pdf
- Description:
- IC ADC 16BIT FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,368
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Product details
Overview
AD7884BPZ from Analog Devices is a 16-bit monolithic sampling analog-to-digital converter with internal sample-and-hold, 5.3 µs conversion time, ±0.0075% FSR integral nonlinearity, and ±5 V/±3 V dual input ranges. It delivers 166 kSPS throughput in industrial data acquisition systems requiring high DC accuracy and dynamic performance.
For engineers reviewing the AD7884BPZ datasheet, AD7884BPZ pinout, AD7884BPZ application, or AD7884BPZ equivalent, key selection criteria include its 16-bit parallel output architecture, two-pass flash conversion topology, internal oscillator timing control, and CERDIP-compatible 44-lead PLCC package with isolated analog/digital ground paths.
Technical Context
The AD7884BPZ implements a two-pass flash ADC architecture: first pass digitizes the 9 MSBs using a 9-bit flash converter and feeds them to an on-chip 16-bit DAC; second pass amplifies and digitizes the residue error to generate the 7 LSBs. Conversion is initiated asynchronously via CONVST and controlled by CS/RD strobes.
It operates from ±5 V analog/digital supplies with separate AVDD/AVSS and VDD/VSS rails, requires a 3 V reference (VREF+S = 3 V), and uses dedicated AGNDS/AGNDF force-sense pairs for the 9-bit ADC section to maintain linearity. The internal oscillator eliminates external clock dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees no missing codes across full transfer function |
| Conversion Time | 5.3 µs max - enables 166 kSPS sustained throughput with overlapping acquisition |
| Integral Nonlinearity | ±0.0075% FSR max - ensures <1 LSB error over full scale for precision measurement |
| Signal-to-Noise+Distortion | 84 dB min at 1 kHz ±5 V input - supports >13.5 ENOB in narrowband applications |
| Analog Input Ranges | ±5 V or ±3 V selectable - configurable via external pin tie-offs without hardware change |
| Power Dissipation | 325 mW max - optimized for high-speed operation within thermal limits of PLCC package |
| Reference Requirement | VREF+S = 3 V - mandates low-noise buffered reference (e.g., AD780 + AD845) for <125 µV system noise budget |
Pinout & Package
The AD7884BPZ is packaged in a 44-lead plastic leaded chip carrier (PLCC), pin 1 identified by corner notch. Package dimensions comply with JEDEC MS-026AC, with 1.27 mm pitch and 16.5 mm × 16.5 mm body size. Thermal resistance θJA = 47.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB15 | 16-bit parallel data output | Twos-complement format; latched result readable only when CS and RD active low |
| CONVST | Asynchronous conversion start | Rising-edge triggered; initiates sample-and-hold hold mode after 50 ns aperture delay |
| CS / RD | Chip select and read strobe | Enable parallel read access; BUSY must be high before initiating next conversion |
| BUSY | Conversion status indicator | Active-low open-drain output; low during entire 5.3 µs conversion cycle |
| VREF+S / VREF+F | Reference sense and force | 3 V reference interface with Kelvin connection to minimize IR drop errors |
| AGNDS / AGNDF | Analog ground sense and force | Dedicated return path for 9-bit ADC section; requires buffered star-ground connection |
| AVDD / AVSS | Analog supply rails | Isolated ±5 V power for sample-and-hold and residue amplifier; decoupling critical |
| VDD / VSS | Digital supply rails | Separate ±5 V for logic and 9-bit ADC core; DGND ties to VDD/VSS common point |
| ±5VINF / ±5VINS | ±5 V input force/sense | Configures ±5 V range; ±3V pins tied to AGND when active |
| ±3VINF / ±3VINS | ±3 V input force/sense | Configures ±3 V range; ±5V pins tied to AGND when active |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 16-bit ADC with S&H | Eliminates external sample-and-hold IC and reduces board area, layout complexity, and signal path errors |
| Two-pass flash architecture | Enables 16-bit resolution at 166 kSPS without pipeline latency or calibration overhead |
| Dual ±5 V / ±3 V input ranges | Hardware-configurable via pin strapping-no firmware or external gain switching required |
| Internal oscillator | Removes need for external clock source and associated jitter-sensitive routing |
| Separate analog/digital ground paths | AGNDS/AGNDF and DGND isolation preserves DC linearity and reduces digital coupling noise |
| Low 120 µV rms noise | Supports high-fidelity signal capture in medical instrumentation and test equipment |
Applications
| Automatic Test Equipment | Medical Instrumentation |
|---|---|
Use Scenario: High-speed parametric testing of semiconductor devices requiring sub-LSB DC accuracy and 100+ kSPS sampling. IC Role / Device Role / Timing Role: Primary digitizer capturing analog stimulus responses with precise timing alignment to CONVST and BUSY signals. Use Value: 5.3 µs conversion time enables tight test loop timing; ±0.0075% INL ensures traceable metrology-grade measurements. | Use Scenario: ECG and EEG front-end digitization where low noise and high linearity preserve diagnostic waveform fidelity. IC Role / Device Role / Timing Role: Final-stage ADC converting conditioned biopotential signals with minimal added distortion. Use Value: 84 dB SNR and 120 µV rms noise meet IEC 60601-2-51 requirements for clinical-grade patient monitoring. |
| Industrial Control | Data Acquisition Systems |
Use Scenario: Closed-loop motor control feedback using resolver or encoder analog outputs requiring real-time position tracking. IC Role / Device Role / Timing Role: High-throughput ADC interfacing with FPGA or microcontroller for servo loop execution at 100 µs intervals. Use Value: 166 kSPS throughput supports 10 kHz control bandwidth; dual input ranges accommodate varying sensor output levels. | Use Scenario: Modular DAQ chassis digitizing multiple ±5 V sensor channels (strain gauges, thermocouples) with synchronized sampling. IC Role / Device Role / Timing Role: Channel-specific ADC in multi-slot backplane system with CS/RD bus arbitration. Use Value: 16-bit parallel interface simplifies FPGA glue logic; PLCC package supports reliable reflow soldering in high-volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed 16-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7884AQ | Same architecture and specs, but in 40-lead CERDIP package; identical INL (±0.0075% FSR), SNR (84 dB), and conversion time (5.3 µs) | CERDIP offers superior hermeticity and temperature stability; less suitable for automated SMT assembly | Select AD7884AQ only if military/aerospace qualification or extended temperature cycling reliability is required |
| AD7682 | Successor SAR ADC; 16-bit, 250 kSPS, SPI interface, single 5 V supply; no dual input ranges or internal oscillator | Requires external reference and clock; lacks ±3 V/±5 V hardware configurability and parallel bus interface | Choose AD7682 for lower power (11 mW), smaller footprint, and modern serial interface-accept trade-off in design flexibility |
Compared with AD7884AQ, AD7884BPZ provides surface-mount compatibility and thermal performance suited for industrial PCBs; versus AD7682, it retains legacy parallel bus support and hardware-selectable input ranges critical for retrofitting existing systems.
Availability
AD7884BPZ is available at Aetrix Electronics and suitable for automatic test equipment, medical instrumentation, and industrial control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7884BPZ 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 AD7884BPZ belongs to Analog Devices' precision high-speed ADC product line, designed specifically for industrial and instrumentation applications demanding 16-bit accuracy, fast throughput, and robust analog input handling without external timing components.
FAQ
What is the maximum sampling rate supported by the AD7884BPZ?
The AD7884BPZ achieves a maximum throughput rate of 166 kSPS. This is enabled by overlapping acquisition and conversion phases-while the second pass processes the residue from one sample, the input SHA acquires the next. The 5.3 µs conversion time and 2.5 µs acquisition time are specified under VDD = +5 V ±5%, VSS = –5 V ±5%, and fSAMPLE = 166 kHz conditions per the AD7884/AD7885 datasheet Rev. E.
Does the AD7884BPZ require an external clock source?
No, the AD7884BPZ does not require an external clock source. It contains an internal oscillator that controls the conversion timing sequence. Conversion is initiated solely by the asynchronous CONVST signal, and BUSY indicates completion. This eliminates clock jitter sensitivity and simplifies system-level timing design compared to externally clocked ADCs.
How do I configure the AD7884BPZ for ±3 V versus ±5 V input range?
To configure the AD7884BPZ for ±5 V input, tie ±5VINF and ±5VINS to their respective analog sources and connect ±3VINF and ±3VINS to AGND. For ±3 V input, reverse the configuration: drive ±3VINF/±3VINS and tie ±5VINF/±5VINS to AGND. The AD7884BPZ detects range selection automatically through these pin states-no register writes or external switches are needed.
What is the purpose of the AGNDS and AGNDF pins on the AD7884BPZ?
The AGNDS (analog ground sense) and AGNDF (analog ground force) pins provide a Kelvin connection for the ground return of the internal 9-bit ADC section. They must be driven by a low-offset, low-noise op amp (e.g., AD817) configured as a unity-gain buffer referenced to system AGND. Directly shorting AGNDS/AGNDF degrades INL, bipolar zero, and gain error-buffering maintains specified ±0.0075% FSR linearity.
Can the AD7884BPZ operate from a single +5 V supply?
No, the AD7884BPZ requires dual ±5 V supplies: VDD = +5 V, VSS = –5 V, AVDD = +5 V, and AVSS = –5 V. The analog and digital sections share voltage rails but demand symmetric bipolar operation to support ±5 V or ±3 V input ranges and maintain specified SNR and THD. Attempting single-supply operation violates absolute maximum ratings and will cause functional failure or permanent damage.
AD7884BPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 166k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±3V, ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7884BPZ FAQ
1.How can I place an order for AD7884BPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7884BPZ 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 AD7884BPZ reliable?
The price and inventory of AD7884BPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7884BPZ is usually 5 days.
3.What payment methods are accepted for AD7884BPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7884BPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7884BPZ?
AD7884BPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7884BPZ 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 AD7884BPZ?
For technical support, including AD7884BPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7884BPZ requirements.
6.How does Aetrix verify that AD7884BPZ is sourced from the original manufacturer or authorized distributors?
All AD7884BPZ 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 AD7884BPZ meets industry standards.
7.What is the process for return or replacement of AD7884BPZ?
All AD7884BPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7884BPZ, 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 AD7884BPZ part is unused and in its original packaging.
Return procedure for AD7884BPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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