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Analog Devices Inc. AD7634BCPZ
- Part No.:
- AD7634BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7634BCPZ.pdf
- Description:
- IC ADC 18BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
AD7634BCPZ from Analog Devices is an 18-bit, 670 kSPS differential successive approximation register (SAR) ADC with programmable input ranges (±10 V, ±5 V, 0–10 V, 0–5 V), integrated 5 V reference (3 ppm/°C drift), and dual parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. It delivers 102.5 dB dynamic range and −112 dB THD at 2 kHz for high-fidelity data acquisition in CT scanners and spectrum analyzers.
For engineers reviewing the AD7634BCPZ datasheet, AD7634BCPZ pinout, AD7634BCPZ application, or AD7634BCPZ equivalent, this page provides verified specifications, interface mode mapping, real-world use scenarios, thermal sensing capability (TEMP pin), and validated alternative options for medical imaging, process control, and high-dynamic-range instrumentation design.
Technical Context
The AD7634BCPZ implements a charge redistribution SAR architecture with no pipeline delay, enabling deterministic conversion timing and true 18-bit no-missing-codes performance. Its iCMOS process supports ±15 V analog supplies (VCC/VEE) alongside 5 V digital rails (AVDD/DVDD/OVDD), enabling direct interfacing with industrial bipolar signal chains.
Hardware- and software-configurable operation includes three sampling modes (warp/normal/impulse), four input ranges selected via MODE[1:0], TEN, and BIPOLAR pins, and flexible digital interface selection (18-/16-/8-bit parallel or serial) - all managed without external clocking or calibration firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full code coverage across full temperature range (−40°C to +85°C). |
| Throughput Rate | 670 kSPS in warp mode - enables real-time capture of fast transients in medical CT detector channels. |
| INL Error | ±2.5 LSB max (±9.5 ppm of FSR) - ensures <0.001% linearity error for precision calibration-critical applications. |
| Dynamic Range | 102.5 dB - supports >100 dB SNR in spectrum analysis up to 2 kHz input frequency. |
| Reference | Integrated 5 V reference with ±3 ppm/°C drift - eliminates need for external low-drift reference in portable instrumentation. |
| Interface Support | Parallel (18-/16-/8-bit) and SPI/QSPI/MICROWIRE/DSP-compatible serial - allows drop-in replacement in legacy microprocessor systems or compact FPGA designs. |
| Power Dissipation | 195 mW @ 670 kSPS (with internal reference) - balances speed and thermal load in densely packed data acquisition modules. |
Pinout & Package
AD7634BCPZ uses a Pb-free, 48-lead LFCSP package (7 mm × 7 mm) with exposed pad connected to VEE per Analog Devices' recommendation. Pin functions are mode-dependent: MODE[1:0] selects interface width; TEN/BIPOLAR configure input range; WARP/IMPULSE set sampling mode; and hardware/software configuration is enabled via HW/SW pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | Accept fully differential signals up to ±10 V; CMRR ≥75 dB at 100 kHz ensures noise rejection in noisy industrial environments. |
| CNVST | Conversion start trigger | Falling edge initiates sampling; aperture jitter = 5 ps rms enables precise time-domain measurements. |
| BUSY | Conversion status indicator | High during conversion; falling edge signals data readiness - usable as hardware handshake in synchronous systems. |
| TEMP | On-chip temperature sensor output | Analog voltage (311 mV @ 25°C, 1 mV/°C slope) - enables system-level thermal compensation without external sensors. |
| REF, REFGND | Internal reference output and ground | 5 V ±35 mV output with 10 ms turn-on settling - supports daisy-chained reference distribution to multiple ADCs. |
| PD, PDBUF, PDREF | Power-down controls | Independent enable/disable of ADC core (PD), reference buffer (PDBUF), and internal reference (PDREF) - enables fine-grained power management. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input ranges | Four hardware-selectable ranges (0–5 V, 0–10 V, ±5 V, ±10 V) eliminate external gain-switching circuitry in multi-range instruments. |
| No pipeline delay | SAR architecture ensures zero-latency conversion - critical for closed-loop control and real-time feedback systems. |
| iCMOS high-voltage process | Supports ±15 V analog supplies (VCC/VEE) while maintaining 5 V logic compatibility - simplifies mixed-signal PCB layout. |
| Integrated temperature sensor | Monitors die temperature with ±1°C accuracy over −40°C to +85°C - enables on-the-fly gain/offset correction in field-deployed equipment. |
| Flexible digital interface | Single device supports 18-bit parallel, 16-bit byte-wide, or serial SPI/QSPI modes - reduces BOM count across product variants. |
Applications
| CT Scanner Detector Interface | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing low-noise, high-dynamic-range current outputs from photodiode arrays in multi-slice CT detectors. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 670 kSPS differential signals with 102.5 dB dynamic range and <5 ps aperture jitter. Use Value: Enables sub-millimeter spatial resolution and accurate Hounsfield unit calculation without external amplification or filtering. |
Use Scenario: High-fidelity baseband digitization of RF downconverted signals in benchtop and portable spectrum analyzers. IC Role / Device Role / Timing Role: Precision ADC with −112 dB THD and 101 dB SNR at 2 kHz - preserves spectral purity for harmonic and intermodulation analysis. Use Value: Eliminates need for external anti-aliasing filters due to 45 MHz −3 dB input bandwidth and inherent linearity. |
| Industrial Process Controller Input Module | Medical Ultrasound Beamformer Calibration |
Use Scenario: Simultaneous acquisition of multiple ±10 V sensor outputs (pressure, temperature, flow) in PLC analog input cards. IC Role / Device Role / Timing Role: Configurable bipolar ADC with hardware-mode selection (TEN/BIPOLAR pins) and integrated 5 V reference for isolated channel scaling. Use Value: Reduces component count by 30% vs. discrete reference + amplifier + ADC solutions while meeting IEC 61000-4 immunity requirements. |
Use Scenario: Calibrating time-of-flight delays and gain matching across 128+ ultrasound transducer channels using known test pulses. IC Role / Device Role / Timing Role: Low-noise 18-bit ADC with TEMP pin feedback used to compensate for temperature-induced beamforming drift. Use Value: Achieves <±0.5 ns timing stability over operating temperature - essential for sub-wavelength focusing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7631BCPZ | 18-bit, 250 kSPS max; no internal reference; requires external 5 V reference. | Limited to lower-speed applications where board space permits external reference and decoupling. | Select when power budget allows external reference and throughput ≤250 kSPS suffices. |
| AD7674ASTZ | 18-bit, 1 MSPS; 64-lead LQFP; higher power (320 mW); no TEMP pin or iCMOS process. | Targeted at high-throughput lab equipment where thermal monitoring is handled externally. | Choose for maximum speed in non-portable systems where 7 mm × 7 mm LFCSP footprint is not required. |
Compared with AD7634BCPZ, AD7631BCPZ trades speed and integration for lower cost and simpler supply sequencing, while AD7674ASTZ prioritizes raw throughput over on-chip features like temperature sensing and ultra-low-drift reference - making AD7634BCPZ optimal for space-constrained, thermally sensitive, and self-calibrating medical/industrial platforms.
Availability
AD7634BCPZ is available at Aetrix Electronics and suitable for CT scanner subsystems, high-dynamic-range data acquisition systems, and medical ultrasound calibration modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7634BCPZ 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, with R&D and manufacturing operations worldwide.
The AD7634BCPZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for demanding applications in medical imaging, test equipment, and industrial automation where resolution, speed, and integration must coexist without compromise.
FAQ
What input voltage ranges does the AD7634BCPZ support, and how are they selected?
The AD7634BCPZ supports four differential input ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. Selection is performed using the TEN and BIPOLAR pins - both low for 0–5 V, TEN high/BIPOLAR low for 0–10 V, TEN low/BIPOLAR high for ±5 V, and both high for ±10 V. This hardware-based configuration avoids software overhead and ensures deterministic range switching during runtime.
Does the AD7634BCPZ require an external reference, or is one integrated?
The AD7634BCPZ integrates a precision 5 V reference with ±3 ppm/°C temperature drift and 10 ms turn-on settling time. When PDREF = PDBUF = low, the internal reference is active and drives the REF pin. External reference operation is also supported (4.75 V to AVDD + 0.1 V) when PDREF = PDBUF = high - providing flexibility for systems requiring tighter reference tolerance or shared reference distribution.
How does the AD7634BCPZ handle power management in low-duty-cycle applications?
The AD7634BCPZ offers granular power control: PD pin disables the ADC core (reducing consumption to 10 μW), PDREF disables the internal reference, and PDBUF disables the reference buffer. In impulse mode at 1 kSPS, total power drops to 10 mW - ideal for battery-powered portable instrumentation where acquisition occurs intermittently but must maintain full 18-bit fidelity when active.
What digital interface options does the AD7634BCPZ provide, and how are they configured?
The AD7634BCPZ supports 18-bit parallel, 16-bit byte-wide, 8-bit, and serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. Configuration is controlled by MODE[1:0] pins: 00 = 18-bit, 01 = 16-bit, 10 = 8-bit, 11 = serial. Serial mode further supports master (internal clock) or slave (external clock) operation via EXT/INT pin, enabling seamless integration into FPGA, DSP, or microcontroller-based systems.
Can the AD7634BCPZ be used in systems requiring temperature compensation, and how is that implemented?
Yes - the AD7634BCPZ includes a dedicated TEMP pin that outputs an analog voltage proportional to die temperature (311 mV at 25°C, 1 mV/°C). This signal can be digitized by a secondary ADC or monitored directly to adjust gain, offset, or timing parameters in real time. Its integration eliminates external temperature sensors and associated calibration complexity in medical and industrial systems where thermal drift impacts measurement accuracy.
AD7634BCPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®, PulSAR®
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 670k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LFCSP-VQ (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7634BCPZ FAQ
1.How can I place an order for AD7634BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7634BCPZ 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 AD7634BCPZ reliable?
The price and inventory of AD7634BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7634BCPZ is usually 5 days.
3.What payment methods are accepted for AD7634BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7634BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7634BCPZ?
AD7634BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7634BCPZ 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 AD7634BCPZ?
For technical support, including AD7634BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7634BCPZ requirements.
6.How does Aetrix verify that AD7634BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7634BCPZ 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 AD7634BCPZ meets industry standards.
7.What is the process for return or replacement of AD7634BCPZ?
All AD7634BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7634BCPZ, 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 AD7634BCPZ part is unused and in its original packaging.
Return procedure for AD7634BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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