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Analog Devices Inc. AD7641BCPZ
- Part No.:
- AD7641BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7641BCPZ.pdf
- Description:
- IC ADC 18BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,348
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Product details
Overview
AD7641BCPZ from Analog Devices is an 18-bit, 2 MSPS charge redistribution SAR analog-to-digital converter with fully differential input, internal 2.048 V reference (±10 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 SNR @ 20 kHz for high-fidelity data acquisition in medical instrumentation and spectrum analysis systems.
For engineers reviewing the AD7641BCPZ datasheet, AD7641BCPZ pinout, AD7641BCPZ application, or AD7641BCPZ equivalent, key selection criteria include throughput mode flexibility (wideband warp/normal), differential ±VREF input range, internal temperature sensor output, low power-down consumption (2 µW), and Pb-free 48-lead LFCSP packaging compatible with industrial-grade −40°C to +85°C operation.
Technical Context
The AD7641BCPZ implements a fully differential switched-capacitor SAR architecture with hardware-calibrated error correction, enabling true 18-bit resolution with no missing codes and ±2 LSB typical INL. Its conversion control supports asynchronous timing via CNVST-triggered hold-and-convert, with BUSY signaling completion and RD/CS-gated parallel or serial readout.
It integrates dual reference paths: internal 2.048 V bandgap reference buffered to REF (with TEMP sensor and REFBUFIN tap) or external reference up to AVDD+0.1 V. Interface modes are selected by MODE[1:0], supporting 18-/16-/8-bit parallel bus or SPI/QSPI/MICROWIRE-compatible serial operation with configurable SYNC polarity, SCLK inversion, and master/slave clock sourcing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full code coverage across full-scale range. |
| Throughput Rate | 2 MSPS in wideband warp/warp mode - enables real-time capture of fast transients in ATE and communications test equipment. |
| INL Accuracy | ±2 LSB typical (±3 LSB max) - ensures precise amplitude fidelity for calibration-critical instrumentation applications. |
| SNR / THD | 93.5 dB SNR and −115 dB THD @ 20 kHz - supports high dynamic range signal reconstruction in spectrum analyzers. |
| Reference | 2.048 V internal reference with ±10 ppm/°C drift - eliminates external reference component count while maintaining thermal stability. |
| Power Dissipation | 75 mW at 2 MSPS with internal reference - balances speed and efficiency for thermally constrained embedded systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and medical environments without derating. |
Pinout & Package
AD7641BCPZ is packaged in a Pb-free 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed paddle, optimized for thermal performance (θJA = 26°C/W) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | Accept ±VREF fully differential input range; require matched layout to preserve CMRR >58 dB at 100 kHz. |
| REF, REFGND | Reference voltage node | Delivers 2.048 V when PDREF/PDBUF = low; requires 10 µF decoupling capacitor for <5 ms turn-on settling. |
| CNVST | Conversion start trigger | Falling-edge sensitive; initiates sample-to-hold transition and starts SAR conversion sequence. |
| BUSY | Conversion status indicator | Active-high open-drain output; falling edge signals valid data ready for parallel/serial readout. |
| MODE[1:0] | Interface configuration control | Selects 18-bit/16-bit/8-bit parallel or serial mode; determines D[0:17] pin functionality per Table 7. |
| TEMP | On-chip temperature sensor output | Provides 278 mV @ 25°C with 1 mV/°C slope; used for system-level thermal monitoring without external sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware factory calibration | Ensures guaranteed AC specs (SNR, THD) and DC linearity without field calibration overhead. |
| No pipeline delay | Enables deterministic latency for closed-loop control and real-time feedback systems. |
| Dual reference operation | Supports seamless transition between internal 2.048 V reference and external references up to 2.63 V. |
| Flexible digital interface | Configurable 18-/16-/8-bit parallel bus or SPI-compatible serial port with master/slave clock options. |
| Low-power power-down mode | Reduces current draw to 2 µW - ideal for battery-powered portable instrumentation. |
Applications
| Medical Imaging Data Acquisition | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing ultrasound echo signals and MRI gradient waveforms requiring high SNR and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary high-speed ADC capturing baseband analog signals with 95.5 dB dynamic range and 50 MHz input bandwidth. Use Value: Enables accurate tissue differentiation and artifact-free spectral reconstruction using 18-bit resolution and −115 dB THD. |
Use Scenario: Capturing RF downconverted IF signals in real-time spectrum analyzers for EMI compliance testing. IC Role / Device Role / Timing Role: High-fidelity digitizer sampling at 2 MSPS with warp mode to resolve narrowband interference peaks. Use Value: Delivers 112 dB SFDR to distinguish low-level spurs from noise floor in crowded RF environments. |
| Automated Test Equipment (ATE) | Digital Signal Processing Systems |
Use Scenario: High-throughput parametric testing of mixed-signal ICs where accuracy and repeatability are critical. IC Role / Device Role / Timing Role: Precision measurement engine acquiring voltage/current waveforms with ±2 LSB INL and no missing codes. Use Value: Reduces test uncertainty and eliminates false fails caused by non-monotonic transfer functions. |
Use Scenario: Real-time sensor fusion in industrial control systems combining vibration, pressure, and temperature streams. IC Role / Device Role / Timing Role: Multi-channel synchronized sampling node interfacing to FPGA or DSP via parallel 18-bit bus. Use Value: Supports simultaneous acquisition with deterministic latency and on-chip TEMP sensor for thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7622BCPZ | 16-bit, 3 MSPS, no internal reference, requires external REF; lower resolution but higher speed. | Suitable for cost-sensitive, speed-prioritized applications where 16-bit resolution suffices. | Choose AD7622BCPZ when throughput >2 MSPS is mandatory and reference design flexibility is preferred. |
| AD7643BCPZ | 18-bit, 2 MSPS, identical architecture and pinout; differs only in internal reference voltage (2.5 V vs. 2.048 V). | Direct drop-in replacement where 2.5 V reference simplifies system-level scaling or matches existing DACs. | Choose AD7643BCPZ when matching a 2.5 V reference rail avoids gain recalibration in signal chain. |
Compared with AD7641BCPZ, AD7622BCPZ trades resolution for speed and external reference dependency, while AD7643BCPZ maintains identical performance except for reference voltage-making it a functionally identical alternative for 2.5 V reference systems.
Availability
AD7641BCPZ is available at Aetrix Electronics and suitable for medical instruments, high-speed data acquisition systems, and spectrum analysis equipment requiring stable component supply, long-term lifecycle support, and industrial temperature grade assurance.
Supply support for AD7641BCPZ 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 AD7641BCPZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, high throughput, and low power in industrial, medical, and test equipment signal chains.
FAQ
What is the maximum sampling rate of the AD7641BCPZ and under which conditions is it achieved?
The AD7641BCPZ achieves a maximum throughput rate of 2 MSPS in wideband warp and warp modes, with a minimum conversion cycle time of 500 ns. This rate requires proper timing alignment of CNVST pulses and BUSY-read synchronization, and is validated with internal reference enabled and OVDD ≥ 2.3 V. The AD7641BCPZ maintains full specified accuracy-including ±2 LSB INL and 93.5 dB SNR-only when operated within the documented timing windows and thermal limits.
Does the AD7641BCPZ support external voltage references, and what are the voltage limits?
Yes, the AD7641BCPZ supports external voltage references applied to the REF pin when PDREF and PDBUF are set high. The allowable external reference voltage range is 1.8 V to AVDD + 0.1 V (i.e., up to 2.63 V), with a maximum current drain of 180 µA at 2 MSPS. The AD7641BCPZ retains full differential input range (±VREF) and all AC/DC specifications when using an external reference, provided the reference exhibits ≤15 ppm/V line regulation and adequate noise filtering.
How does the MODE[1:0] pin configuration affect the AD7641BCPZ data interface behavior?
The MODE[1:0] pins configure the AD7641BCPZ's digital interface into one of four modes: 18-bit parallel (00), 16-bit parallel (01), 8-bit parallel (10), or serial (11). In each mode, specific pins (e.g., D0/OB/2C, D1/A0, D2/A1) assume alternate functions such as address bits or format controls. The AD7641BCPZ's internal logic maps these selections directly to its shift register and bus drivers-enabling flexible host processor compatibility without external glue logic.
What is the purpose and electrical behavior of the TEMP pin on the AD7641BCPZ?
The TEMP pin on the AD7641BCPZ provides a calibrated analog voltage output proportional to die temperature: 278 mV at 25°C with a sensitivity of 1 mV/°C and output resistance of 4.7 kΩ. It is intended for system-level thermal monitoring-not precision temperature measurement-and requires no external excitation. The AD7641BCPZ uses this same sensor internally for reference drift compensation, ensuring consistent performance across its −40°C to +85°C operating range.
Can the AD7641BCPZ operate with different I/O voltage levels, and how is OVDD used?
Yes, the AD7641BCPZ supports mixed-voltage I/O via the OVDD supply, which powers the digital interface circuitry and can be independently set to 2.5 V, 3.3 V, or 5 V-enabling direct connection to diverse host processors. OVDD must remain within 2.3 V to 3.6 V, and its ground (OGND) must be tied to DGND with low-impedance routing. All digital inputs (CNVST, CS, RD, etc.) accept logic levels referenced to OVDD, while DVDD remains fixed at 2.5 V for core logic. This separation allows the AD7641BCPZ to interface reliably across voltage domains without level shifters.
AD7641BCPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 2M
- 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:
- -
AD7641BCPZ FAQ
1.How can I place an order for AD7641BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7641BCPZ 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 AD7641BCPZ reliable?
The price and inventory of AD7641BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7641BCPZ is usually 5 days.
3.What payment methods are accepted for AD7641BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7641BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7641BCPZ?
AD7641BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7641BCPZ 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 AD7641BCPZ?
For technical support, including AD7641BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7641BCPZ requirements.
6.How does Aetrix verify that AD7641BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7641BCPZ 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 AD7641BCPZ meets industry standards.
7.What is the process for return or replacement of AD7641BCPZ?
All AD7641BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7641BCPZ, 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 AD7641BCPZ part is unused and in its original packaging.
Return procedure for AD7641BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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