My Inquiry
My Account
Analog Devices Inc. AD7688BCPZRL
- Part No.:
- AD7688BCPZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7688BCPZRL.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,587
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7688BCPZRL from Analog Devices is a 16-bit, charge redistribution successive approximation ADC with true differential input, ±1.5 LSB max INL, 500 kSPS throughput, and no pipeline delay-designed for precision data acquisition in battery-powered instrumentation and medical instruments.
For engineers reviewing the AD7688BCPZRL datasheet, AD7688BCPZRL pinout, AD7688BCPZRL application, or AD7688BCPZRL equivalent, this page delivers verified specifications, validated pin functions, confirmed packaging (3 mm × 3 mm LFCSP), real-world interface timing, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The AD7688BCPZRL implements a proprietary charge redistribution DAC architecture with dual 16-bit capacitor arrays, enabling precise differential sampling without latency. Its on-chip track-and-hold acquires signals at up to 9 MHz bandwidth with 2.5 ns aperture delay and supports full-scale step transient response in 400 ns.
It features a SPI/QSPI/MICROWIRE/DSP-compatible serial interface with daisy-chain capability via SDI/SDO, BUSY indicator support, and independent VIO supply (1.8 V–5 V) for mixed-voltage system interfacing-while maintaining single 5 V (4.5–5.5 V) analog operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage across full temperature range. |
| Throughput | 500 kSPS maximum-enables real-time capture of high-frequency sensor or control loop signals. |
| INL | ±1.5 LSB max (±23 ppm FSR)-ensures accurate end-point linearity critical for calibration-sensitive instrumentation. |
| Dynamic Range | 96.5 dB-supports >15.7 ENOB for low-noise signal extraction in noisy industrial environments. |
| SNR | 95.5 dB at 20 kHz-delivers high-fidelity digitization of audio-band and vibration monitoring signals. |
| Power @ 100 kSPS | 3.75 mW at 5 V-enables continuous high-speed acquisition in energy-constrained portable devices. |
| Standby Current | 1 nA-facilitates ultra-low-power sleep modes in battery-operated data loggers. |
| Analog Input Range | True differential ±VREF (up to ±5 V)-rejects common-mode noise while supporting bipolar transducer outputs. |
Pinout & Package
AD7688BCPZRL is housed in a 10-lead, 3 mm × 3 mm LFCSP package with exposed paddle requiring GND connection. Pin numbering follows JEDEC-standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts external 0.5 V to VDD reference; must be decoupled with 10 µF ceramic capacitor for stable conversion accuracy. |
| 2 - VDD | Analog power supply | 4.5 V–5.5 V single supply; powers internal track-and-hold, DAC, and comparator circuitry. |
| 3 - IN+ | Differential analog input (+) | Accepts true differential voltage relative to IN−; common-mode range 0 V to VREF/2 + 0.1 V. |
| 4 - IN− | Differential analog input (−) | Completes differential pair; rejects common-mode interference up to 65 dB at 250 kHz. |
| 5 - GND | Analog/digital ground | Common return for VDD, REF, and digital I/O; exposed paddle must connect to this node in LFCSP. |
| 6 - CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. chain); doubles as chip select in CS mode. |
| 7 - SDO | Serial data output | 16-bit twos-complement result synchronized to SCK falling edge; high-impedance when not selected. |
| 8 - SCK | Serial clock input | Drives data shift-out; minimum period 17 ns (VIO > 4.5 V); no clock required for internal conversion timing. |
| 9 - SDI | Serial data input | Selects interface mode on CNV rising edge (low = chain, high = CS); enables daisy-chaining in chain mode. |
| 10 - VIO | Digital I/O supply | 1.8 V–5 V logic interface supply; isolates digital noise from analog section and enables mixed-voltage host interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion results available immediately after completion-eliminates latency-induced phase errors in closed-loop control systems. |
| Proprietary serial interface | Supports 3-wire CS mode (with optional BUSY) and 3-wire chain mode-reduces PCB routing complexity in multi-ADC systems. |
| True differential input | ±VREF range with 65 dB CMRR at 250 kHz-enables direct connection to bridge sensors and isolated amplifiers without level-shifting. |
| Scalable power consumption | 3.75 µW at 100 SPS, 21.5 mW at 500 kSPS-allows dynamic power scaling for duty-cycled sensing applications. |
| Pin-for-pin compatibility | Interchangeable with AD7685, AD7686, and AD7687-simplifies design reuse and performance tiering within same PCB layout. |
Applications
| Portable Medical Monitoring | Industrial Process Control |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing differential lead signals at 1 kSPS with <1 µV RMS noise floor. Use Value: 95.5 dB SNR and 1.5 LSB INL ensure diagnostic-grade fidelity; 1 nA standby current extends battery runtime between charges. |
Use Scenario: High-precision pressure and temperature feedback in PLC analog input modules. IC Role / Device Role / Timing Role: Isolated channel ADC converting 4–20 mA loop signals via precision resistor and op-amp conditioning. Use Value: True differential input rejects 60 Hz mains noise; ±1.5 LSB INL meets IEC 61000-4-3 immunity requirements for factory-floor EMC. |
| Battery-Powered Data Loggers | Test & Measurement Equipment |
Use Scenario: Remote environmental sensor nodes logging temperature, humidity, and gas concentration over months on AA batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by microcontroller interrupt to sample conditioned analog outputs. Use Value: 3.75 µW power at 100 SPS enables >1-year operation; daisy-chain interface reduces wiring count in multi-sensor deployments. |
Use Scenario: Modular digitizer card in benchtop oscilloscopes and spectrum analyzers requiring 16-bit resolution at >100 kSPS. IC Role / Device Role / Timing Role: High-speed acquisition core with 400 ns transient response for fast edge capture and jitter analysis. Use Value: 96.5 dB dynamic range resolves small-amplitude harmonics; no missing codes prevents spectral artifacts in FFT-based measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7685BRMZ | 250 kSPS max throughput, ±1.5 LSB INL, identical 10-lead MSOP/LFCSP footprint and pinout. | Limited to lower-bandwidth sensor interfaces (e.g., thermocouples, RTDs) where 500 kSPS is unnecessary. | Select when system sampling rate ≤250 kSPS and board space allows same package; drop-in replacement with no layout change. |
| AD7687BRMZ | 500 kSPS throughput, ±2 LSB INL (worse than AD7688BCPZRL's ±1.5 LSB), same serial interface and power specs. | Suitable for cost-sensitive industrial DAQ where 0.5 LSB INL margin is acceptable for non-calibrated measurements. | Choose for budget-constrained designs accepting reduced linearity; verify system-level calibration tolerance before substitution. |
Compared with AD7685BRMZ and AD7687BRMZ, the AD7688BCPZRL delivers superior linearity (±1.5 LSB vs. ±2 LSB) and higher dynamic range (96.5 dB vs. 94.5 dB), making it optimal for metrology-grade applications where measurement traceability is required.
Availability
AD7688BCPZRL is available at Aetrix Electronics and suitable for portable medical monitoring, industrial process control, and battery-powered data loggers requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for AD7688BCPZRL 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 healthcare markets since 1965.
The AD7688BCPZRL belongs to Analog Devices' PulSAR™ family of precision SAR ADCs-engineered specifically for high-resolution, low-latency data acquisition in resource-constrained embedded systems.
FAQ
What is the maximum recommended reference voltage for AD7688BCPZRL?
The AD7688BCPZRL supports an external reference voltage from 0.5 V to VDD, with VDD specified from 4.5 V to 5.5 V. Therefore, the maximum recommended reference voltage is 5.5 V. However, typical operation uses VREF = VDD = 5 V to achieve full 96.5 dB dynamic range and 95.5 dB SNR; exceeding VDD risks violating absolute maximum ratings on the REF pin.
Does AD7688BCPZRL require an external clock for conversion?
No, the AD7688BCPZRL does not require an external clock for the conversion process-it contains an internal conversion clock. The SCK signal is used only for serial data readout and has no effect on conversion timing. Conversion is initiated solely by the CNV rising edge, and results are available within 1.6 µs regardless of SCK frequency.
Can AD7688BCPZRL operate with a 3.3 V digital interface while using a 5 V analog supply?
Yes, AD7688BCPZRL supports independent digital and analog supplies: VDD = 5 V (4.5–5.5 V) for analog circuitry and VIO = 1.8 V–5 V for digital I/O. With VIO = 3.3 V, all digital inputs (CNV, SDI, SCK) accept 3.3 V logic levels, and SDO outputs are compatible with 3.3 V receivers-enabling seamless integration with 3.3 V microcontrollers without level shifters.
What is the purpose of the exposed paddle in the AD7688BCPZRL LFCSP package?
The exposed paddle in the AD7688BCPZRL's 3 mm × 3 mm LFCSP package must be soldered and electrically connected to GND. It serves as a low-inductance thermal and electrical path to improve heat dissipation and reduce ground bounce, directly contributing to stable 95.5 dB SNR performance and robust ESD immunity per JEDEC J-STD-20 reflow guidelines.
How does the AD7688BCPZRL handle input overvoltage conditions?
The AD7688BCPZRL analog inputs (IN+, IN−) include integrated ESD diodes rated for ±130 mA forward current. However, these diodes begin conducting if input voltage exceeds GND − 0.3 V or VDD + 0.3 V. To prevent damage or erroneous conversion, external clamping or series resistance must limit current under fault conditions-especially when driving from op-amps powered by supplies different from VDD.
AD7688BCPZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7688BCPZRL FAQ
1.How can I place an order for AD7688BCPZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7688BCPZRL 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 AD7688BCPZRL reliable?
The price and inventory of AD7688BCPZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7688BCPZRL is usually 5 days.
3.What payment methods are accepted for AD7688BCPZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7688BCPZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7688BCPZRL?
AD7688BCPZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7688BCPZRL 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 AD7688BCPZRL?
For technical support, including AD7688BCPZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7688BCPZRL requirements.
6.How does Aetrix verify that AD7688BCPZRL is sourced from the original manufacturer or authorized distributors?
All AD7688BCPZRL 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 AD7688BCPZRL meets industry standards.
7.What is the process for return or replacement of AD7688BCPZRL?
All AD7688BCPZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7688BCPZRL, 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 AD7688BCPZRL part is unused and in its original packaging.
Return procedure for AD7688BCPZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7688BCPZRL 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…
