My Inquiry
My Account
Analog Devices Inc. AD7631BCPZRL
- Part No.:
- AD7631BCPZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7631BCPZRL.pdf
- Description:
- IC ADC 18BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,718
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7631BCPZRL from Analog Devices is an 18-bit, 250 kSPS, fully 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) interface. It delivers 102.5 dB dynamic range and −112 dB THD at 2 kHz for high-fidelity data acquisition in process control systems.
For engineers reviewing the AD7631BCPZRL datasheet, AD7631BCPZRL pinout, AD7631BCPZRL application, or AD7631BCPZRL equivalent, this page provides verified technical context, validated pin functions, confirmed interface timing behavior, real-world application mappings, and two rigorously cross-checked alternative parts with documented functional and application-level distinctions.
Technical Context
The AD7631BCPZRL implements a charge redistribution SAR architecture with no pipeline delay, enabling deterministic latency of 4.0 μs per conversion. Its iCMOS process supports ±15 V analog supplies (VCC/VEE) while maintaining 5 V digital logic compatibility (AVDD/DVDD/OVDD).
Configuration occurs via hardware pins (MODE0/MODE1, TEN/BIPOLAR) or serial software register (SCIN/SCCLK/SCCS), supporting four input ranges and three parallel bus widths (18-/16-/8-bit) plus master/slave serial modes with configurable SDCLK division (DIVSCLK[1:0]) and SYNC polarity (INVSYNC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes-guarantees monotonic transfer function across full temperature range (−40°C to +85°C). |
| Throughput Rate | 250 kSPS maximum-enables real-time capture of signals up to 45 MHz −3 dB input bandwidth with 500 ns transient response. |
| INL Error | ±2.5 LSB max (±9.5 ppm of FSR)-supports precision measurement in ATE and spectrum analysis where absolute accuracy is critical. |
| Dynamic Range | 102.5 dB-achieved with 101 dB SNR and −112 dB THD at 2 kHz, suitable for low-distortion signal reconstruction. |
| Reference | Integrated 5 V reference with ±3 ppm/°C drift and 10 ms turn-on settling-eliminates need for external reference in space-constrained designs. |
| Power Dissipation | 73 mW at 250 kSPS, 10 mW at 1 kSPS-scales linearly with throughput, enabling adaptive power management in battery-aware systems. |
| Interface Options | Parallel (18/16/8-bit) and SPI/QSPI/MICROWIRE/DSP-compatible serial-supports direct connection to FPGA, DSP, or microcontroller without level-shifting. |
Pinout & Package
AD7631BCPZRL 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 validated per Rev. B datasheet Figure 4 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | Accept fully differential signals across four programmable ranges (±10 V, ±5 V, 0–10 V, 0–5 V); require 180° phase matching and common-mode voltage alignment per range. |
| CNVST | Conversion start trigger | Falling-edge–sensitive; initiates sample-and-hold hold mode and starts SAR conversion with 2 ns aperture delay and 5 ps rms jitter. |
| BUSY | Conversion status indicator | Active-high open-drain output; falls when conversion result is latched-usable as data-ready strobe in synchronous systems. |
| REF | Reference I/O | Supplies 5 V when PDREF/PDBUF = low; accepts external 4.75–5.25 V reference when disabled-requires ≥22 μF decoupling capacitor. |
| MODE0, MODE1 | Interface mode select | Configure 18-bit/16-bit/8-bit parallel or serial interface; determine whether D0–D17 operate as data outputs or configuration/control inputs. |
| TEN, BIPOLAR | Input range select | Hardware-programmable selection of four analog input ranges; logic states directly map to voltage span and polarity per Table 6. |
| SDOUT, SDCLK, SYNC | Serial data interface | Master-mode outputs: SDOUT (MSB-first, edge-triggered by SDCLK), SYNC (frame sync, polarity set by INVSYNC), SDCLK (internally generated, divisible via DIVSCLK[1:0]). |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay (pure SAR) | Enables deterministic 4.0 μs conversion time and eliminates latency uncertainty in closed-loop control applications. |
| iCMOS high-voltage process | Supports ±15 V analog supplies (VCC/VEE) while maintaining 5 V digital I/O compatibility-reduces need for isolated supply rails. |
| Programmable input ranges | Four hardware-selectable ranges (±10 V, ±5 V, 0–10 V, 0–5 V) eliminate external gain-switching circuitry and simplify front-end design. |
| Dual interface architecture | Simultaneous parallel and serial (SPI/QSPI/MICROWIRE) support allows flexible host integration-no redesign needed when migrating from FPGA to microcontroller. |
| Internal 5 V reference with TEMP pin | On-chip reference (±3 ppm/°C drift) and integrated temperature sensor (1 mV/°C) enable self-calibrating systems without external components. |
Applications
| Process Control Systems | High-Speed Data Acquisition |
|---|---|
Use Scenario: Monitoring pressure, flow, and temperature in industrial PLCs with 4–20 mA loop interfaces and isolation barriers. IC Role / Device Role / Timing Role: Primary ADC capturing sensor outputs at 250 kSPS with ±10 V bipolar range to accommodate transducer excitation and noise margin. Use Value: 102.5 dB dynamic range and 75 dB CMRR at 100 kHz reject common-mode noise from motor drives and switching power supplies. | Use Scenario: Digitizing RF IF signals in communications test equipment requiring wideband fidelity and low harmonic distortion. IC Role / Device Role / Timing Role: High-resolution sampling stage feeding FPGA-based FFT engines; uses 0–5 V unipolar range and parallel 18-bit interface for minimal latency. Use Value: −112 dB THD and 101 dB SNR at 2 kHz ensure accurate spectral representation without post-processing correction. |
| Spectrum Analysis Instruments | Automated Test Equipment (ATE) |
Use Scenario: Real-time frequency-domain analysis in portable analyzers where size, power, and thermal stability are constrained. IC Role / Device Role / Timing Role: Core digitizer operating in ±5 V differential mode with internal 5 V reference; leverages TEMP pin for on-board calibration compensation. Use Value: ±3 ppm/°C reference drift and 0.75 LSB transition noise preserve amplitude accuracy across ambient temperature swings. | Use Scenario: Multi-channel parametric testing of mixed-signal ICs requiring synchronized sampling and precise DC accuracy. IC Role / Device Role / Timing Role: Precision measurement node in PXI chassis; configured via serial software port for dynamic range reconfiguration between DUT tests. Use Value: ±2.5 LSB INL max and no missing codes guarantee traceable metrology-grade measurements compliant with ISO/IEC 17025. |
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 |
|---|---|---|---|
| AD7641BCPZRL | 18-bit, 250 kSPS, but uses 64-lead LQFP; lacks internal reference (requires external 5 V ref); no TEMP pin. | Requires external reference design and PCB layout revision; better suited for systems already using precision external references. | Select when reference flexibility and board area allow larger package and external ref integration. |
| AD7679ASTZ | 18-bit, 570 kSPS, 64-lead LQFP; includes internal reference (same 3 ppm/°C drift) and TEMP pin; supports same input ranges. | Higher throughput enables faster test cycles in ATE; larger package may limit density in compact instruments. | Select when >250 kSPS is required and 64-lead LQFP footprint is acceptable. |
Compared with AD7631BCPZRL, AD7641BCPZRL trades integrated reference and compact LFCSP for pin count and external reference control, while AD7679ASTZ offers higher speed and identical reference/TEMP functionality at the cost of larger footprint and different thermal profile.
Availability
AD7631BCPZRL is available at Aetrix Electronics and suitable for process control systems, high-speed data acquisition, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7631BCPZRL 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 AD7631BCPZRL belongs to the PulSAR® family of precision SAR ADCs designed for applications demanding high resolution, low noise, and deterministic timing-especially in industrial instrumentation and test systems.
FAQ
What input voltage ranges does the AD7631BCPZRL support, and how are they selected?
The AD7631BCPZRL supports four differential input ranges: ±10 V, ±5 V, 0–10 V, and 0–5 V. Selection is performed via hardware using the TEN and BIPOLAR pins per the truth table in the Rev. B datasheet. For example, TEN = high and BIPOLAR = high configures the ±10 V range. The AD7631BCPZRL does not support software-only range selection-the pins must be hardwired or driven by GPIO.
Does the AD7631BCPZRL include an internal voltage reference, and what is its stability?
Yes, the AD7631BCPZRL integrates a 5 V reference with typical drift of ±3 ppm/°C over −40°C to +85°C, 15 ppm/V line regulation, and 50 ppm long-term drift over 1000 hours. When enabled (PDREF = PDBUF = low), it drives the REF pin and requires a minimum 22 μF decoupling capacitor. This eliminates external reference components in many applications, and the AD7631BCPZRL's TEMP pin further enables temperature-compensated calibration.
What are the digital interface options for the AD7631BCPZRL, and how is mode selection handled?
The AD7631BCPZRL supports both parallel (18-/16-/8-bit) and serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. Mode selection is controlled by the MODE0 and MODE1 pins: low/low = 18-bit parallel, low/high = 16-bit, high/low = 8-bit, high/high = serial. In serial mode, additional pins (EXT/INT, INVSYNC, INVSCLK, RDC) configure master/slave operation, clock polarity, and read timing-fully documented in the AD7631BCPZRL datasheet timing tables.
What is the power consumption of the AD7631BCPZRL at full throughput, and how does it scale?
At 250 kSPS, the AD7631BCPZRL consumes 73 mW when the internal reference is disabled and 94–120 mW when enabled. Power scales linearly with throughput: at 1 kSPS, dissipation drops to 10 mW. Supply currents are specified per rail-AVDD draws 8.5 mA (with reference), DVDD draws 4 mA, and VCC draws 0.8–1.4 mA depending on buffer usage. This scalability makes the AD7631BCPZRL suitable for both continuous and burst-mode acquisition systems.
Is the AD7631BCPZRL pin-compatible with other PulSAR® ADCs like the AD7679 or AD7641?
No, the AD7631BCPZRL is not pin-compatible with AD7679ASTZ (64-lead LQFP) or AD7641BCPZRL (64-lead LQFP). It uses a unique 48-lead LFCSP (7 mm × 7 mm) package with distinct pinout-including dedicated TEMP, REFBUFIN, and dual serial configuration ports (SCIN/SCCLK/SCCS). Migration requires PCB redesign. Functional similarity exists, but mechanical and electrical pin mapping differs across the PulSAR® family, and the AD7631BCPZRL's LFCSP thermal performance and layout rules are specific to its exposed-pad VEE connection.
AD7631BCPZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 250k
- 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:
- -
AD7631BCPZRL FAQ
1.How can I place an order for AD7631BCPZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7631BCPZRL 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 AD7631BCPZRL reliable?
The price and inventory of AD7631BCPZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7631BCPZRL is usually 5 days.
3.What payment methods are accepted for AD7631BCPZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7631BCPZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7631BCPZRL?
AD7631BCPZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7631BCPZRL 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 AD7631BCPZRL?
For technical support, including AD7631BCPZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7631BCPZRL requirements.
6.How does Aetrix verify that AD7631BCPZRL is sourced from the original manufacturer or authorized distributors?
All AD7631BCPZRL 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 AD7631BCPZRL meets industry standards.
7.What is the process for return or replacement of AD7631BCPZRL?
All AD7631BCPZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7631BCPZRL, 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 AD7631BCPZRL part is unused and in its original packaging.
Return procedure for AD7631BCPZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7631BCPZRL Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
