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Analog Devices Inc. AD7643BCPZ
- Part No.:
- AD7643BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7643BCPZ.pdf
- Description:
- IC ADC 18BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,039
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Product details
Overview
AD7643BCPZ from Analog Devices is an 18-bit, 1.25 MSPS charge redistribution SAR analog-to-digital converter with fully differential input, internal 2.048 V reference (±8 ppm/°C drift), no pipeline delay, and dual parallel/serial interface support. It operates from a single 2.5 V supply and delivers 93.5 dB SINAD at 20 kHz for high-fidelity data acquisition in instrumentation and medical systems.
For engineers reviewing the AD7643BCPZ datasheet, AD7643BCPZ pinout, AD7643BCPZ application, or AD7643BCPZ equivalent, key selection considerations include its true differential input architecture, guaranteed no missing codes over 18 bits, low power-down consumption (2 μW), ±3 LSB max INL, and flexible 48-lead LFCSP package compatibility with AD7641.
Technical Context
The AD7643BCPZ implements a capacitor-based charge redistribution SAR architecture with hardware factory calibration for dc and ac performance-ensuring ±3 LSB max INL, 95 dB dynamic range, and −113 dB THD at 20 kHz. Its internal reference buffer supports both internal (2.048 V) and external reference configurations via PDREF/PDBUF control.
It supports four digital interface modes (18-/16-/8-bit parallel or serial) selected by MODE[1:0], with configurable data format (straight binary/twos complement), active-low CNVST-triggered sampling, and BUSY-driven data-ready signaling-enabling asynchronous rate operation without latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes-guarantees monotonicity and full-scale fidelity for precision measurement. |
| Throughput Rate | 1.25 MSPS-supports real-time capture of fast transients in spectrum analysis and ATE. |
| INL | ±3 LSB maximum (±11 ppm of full scale)-limits end-point linearity error in calibrated systems. |
| SINAD | 93.5 dB typical @ 20 kHz (VREF = 2.5 V)-defines usable dynamic range for low-noise signal chain design. |
| Reference | Internal 2.048 V ±8 ppm/°C drift-eliminates external reference component count while maintaining temperature stability. |
| Power Dissipation | 65 mW typical @ 1.25 MSPS with internal REF-enables high-speed conversion within thermal constraints of dense PCB layouts. |
| Supply Voltage | Single 2.5 V AVDD/DVDD-simplifies power rail design and reduces BOM complexity versus dual-supply ADCs. |
| Operating Temp | −40°C to +85°C-validated for industrial and medical equipment deployed in uncontrolled environments. |
Pinout & Package
AD7643BCPZ is packaged in a Pb-free, 48-lead LFCSP (7 mm × 7 mm, 0.85 mm height) with exposed paddle for thermal enhancement. Pin functions are mode-dependent, supporting parallel (18-/16-/8-bit) and serial interfaces via MODE[1:0] configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | Accept ±VREF (up to ±2.5 V) full-scale differential signal; require matched layout for >58 dB CMRR. |
| CNVST | Conversion start trigger | Falling-edge sensitive; initiates sample-and-hold hold phase and conversion-no minimum pulse width required beyond 15 ns. |
| BUSY | Conversion status indicator | Active-high open-drain output; falling edge signals valid data ready for read-usable as system clock sync. |
| MODE[1:0] | Interface mode select | Configures 18-bit parallel, 16-bit high/low word, 8-bit byte, or serial interface-determines D[0:17] function mapping. |
| PDREF, PDBUF | Reference power control | PDREF = low enables internal 2.048 V reference; PDBUF = low enables internal buffer-both required for internal REF use. |
| TEMP | On-chip temperature sensor | Analog output (278 mV @ 25°C, 1 mV/°C) for die temperature monitoring-requires external ADC or ratiometric reading. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture ensures zero-latency conversion results-critical for closed-loop control and real-time feedback systems. |
| Dual interface flexibility | Hardware-selectable parallel (18/16/8-bit) or SPI/QSPI/MICROWIRE-compatible serial-reduces FPGA/ASIC I/O resource pressure. |
| Factory-calibrated ac/dc performance | Guaranteed SNR, gain, offset, and linearity specs eliminate field calibration overhead in production test systems. |
| Low-power shutdown | 2 μW power-down mode-extends battery life in portable instrumentation and enables rapid wake-on-event sampling. |
| Integrated temperature sensor | On-die TEMP pin provides direct die temperature measurement-enables thermal derating and self-compensation algorithms. |
| Differential input with high CMRR | 58 dB CMRR at 100 kHz-rejects common-mode noise in motor drive current sensing and ECG front-ends. |
Applications
| Medical Instrumentation | High-Speed Data Acquisition |
|---|---|
Use Scenario: High-resolution ECG and EEG signal digitization in portable diagnostic devices requiring low power and clinical-grade accuracy. IC Role / Device Role / Timing Role: Primary ADC capturing differential biopotential signals at ≥1 kSPS with <1 µV rms noise floor and calibrated dc accuracy. Use Value: 18-bit resolution and 93.5 dB SINAD enable detection of microvolt-level cardiac anomalies without oversampling or post-processing gain. | Use Scenario: Real-time transient capture in automated test equipment (ATE) for semiconductor characterization under varying load conditions. IC Role / Device Role / Timing Role: High-throughput sampling engine synchronized to stimulus generators via CNVST and BUSY signals for deterministic timing. Use Value: 1.25 MSPS throughput with no pipeline delay allows single-shot capture of sub-microsecond events across full 18-bit dynamic range. |
| Spectrum Analysis | Digital Signal Processing |
Use Scenario: Baseband digitization in RF test receivers and vector signal analyzers where spurious-free dynamic range directly impacts measurement confidence. IC Role / Device Role / Timing Role: Front-end ADC feeding FPGA-based FFT engines with precise phase coherence across channels. Use Value: 114 dB SFDR at 20 kHz enables clean spectral decomposition of multi-tone signals without harmonic contamination. | Use Scenario: Sensor fusion node in industrial IoT gateways digitizing vibration, temperature, and pressure from multiple analog sources. IC Role / Device Role / Timing Role: Multi-channel acquisition hub using serial daisy-chain mode (SDIN/SDOUT) to minimize host interface pins. Use Value: Serial slave mode with SDIN support allows time-synchronized sampling across up to four AD7643BCPZ units on shared SCLK/CS lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7641BCPZ | 18-bit, 2.5 MSPS, same 48-lead LFCSP package and pinout; higher throughput but higher power (100 mW @ 2.5 MSPS). | Used where sampling rate >1.25 MSPS is mandatory and thermal headroom permits higher dissipation. | Select AD7641BCPZ only if throughput >1.25 MSPS is required and system cooling supports 50% higher power draw. |
| AD7622BCPZ | 16-bit, 3 MSPS, 48-lead LFCSP; lower resolution but higher speed and lower latency (500 ns conversion time vs. 550 ns). | Preferred in cost-sensitive, bandwidth-critical applications where 16-bit resolution suffices (e.g., motor control position feedback). | Choose AD7622BCPZ when 16-bit resolution meets system SNR requirements and sub-600 ns conversion latency is critical. |
Compared with AD7641BCPZ and AD7622BCPZ, the AD7643BCPZ uniquely balances 18-bit integrity, 1.25 MSPS throughput, and 65 mW power-making it optimal for portable, battery-constrained, high-fidelity measurement systems where resolution cannot be traded for speed.
Availability
AD7643BCPZ is available at Aetrix Electronics and suitable for medical instrumentation, high-speed data acquisition, and spectrum analysis requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7643BCPZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The AD7643BCPZ belongs to the PulSAR® family of precision SAR ADCs designed for applications demanding high resolution, high throughput, and low power-particularly in portable and thermally constrained measurement systems.
FAQ
What is the maximum recommended input voltage range for AD7643BCPZ when using the internal reference?
The AD7643BCPZ supports a differential input range of ±VREF. With the internal 2.048 V reference enabled, the maximum input range is ±2.048 V across IN+ and IN−. The absolute input voltage on each pin must remain between −0.1 V and AVDD (2.5 V); exceeding this violates absolute maximum ratings and risks damage.
Does AD7643BCPZ require external calibration for production use?
No. The AD7643BCPZ is hardware factory calibrated for dc parameters (gain, offset, INL) and ac performance (SNR, THD, SFDR). All specifications-including ±3 LSB max INL and 93.5 dB SINAD-are guaranteed over temperature without user calibration, reducing test time and firmware overhead in final assembly.
Can AD7643BCPZ operate with an external reference voltage higher than 2.5 V?
Yes. When PDREF = high, the AD7643BCPZ accepts external reference voltages from 1.8 V to AVDD + 0.1 V (i.e., up to 2.6 V). However, the differential input range remains ±VREF, so using a 2.5 V external reference maintains full 18-bit utilization without scaling loss-unlike references >2.5 V which exceed AVDD limits.
How does the TEMP pin on AD7643BCPZ function in system design?
AD7643BCPZ's TEMP pin outputs an analog voltage (278 mV at 25°C, 1 mV/°C) proportional to die temperature. It requires no excitation and can be read by any external ADC with ≥12-bit resolution. This enables real-time thermal monitoring for gain/offset compensation or overtemperature shutdown-without adding discrete sensors.
Is AD7643BCPZ pin-compatible with other PulSAR ADCs in the same package?
Yes. AD7643BCPZ uses the same 48-lead LFCSP footprint and pinout as AD7641BCPZ and shares functional compatibility with AD7621/AD7622/AD7623 in Table 1 of the datasheet. This enables drop-in replacement in existing designs targeting 18-bit resolution, though throughput and power differ across variants.
AD7643BCPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1.25M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, Parallel, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.37V ~ 2.63V
- Voltage - Supply, Digital:
- 2.37V ~ 2.63V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LFCSP-VQ (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7643BCPZ FAQ
1.How can I place an order for AD7643BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7643BCPZ 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 AD7643BCPZ reliable?
The price and inventory of AD7643BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7643BCPZ is usually 5 days.
3.What payment methods are accepted for AD7643BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7643BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7643BCPZ?
AD7643BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7643BCPZ 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 AD7643BCPZ?
For technical support, including AD7643BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7643BCPZ requirements.
6.How does Aetrix verify that AD7643BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7643BCPZ 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 AD7643BCPZ meets industry standards.
7.What is the process for return or replacement of AD7643BCPZ?
All AD7643BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7643BCPZ, 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 AD7643BCPZ part is unused and in its original packaging.
Return procedure for AD7643BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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