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Analog Devices Inc. AD7688BCPZRL7
- Part No.:
- AD7688BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7688BCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,425
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Product details
Overview
AD7688BCPZRL7 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. It operates from a single 5 V supply with 1.8 V–5 V logic interface (VIO), supports SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and targets high-precision data acquisition in battery-powered instrumentation and medical devices.
For engineers reviewing the AD7688BCPZRL7 datasheet, AD7688BCPZRL7 pinout, AD7688BCPZRL7 application, or AD7688BCPZRL7 equivalent, key selection criteria include its 96.5 dB dynamic range, −118 dB THD at 20 kHz, 2.5 ns aperture delay, daisy-chain capability, and 1 nA standby current-critical for low-power, high-fidelity signal chain design.
Technical Context
The AD7688BCPZRL7 implements a charge redistribution DAC architecture with dual 16-bit capacitor arrays, enabling precise differential sampling without latency. Its track-and-hold circuit acquires the voltage difference between IN+ and IN− on the CNV rising edge, supporting true differential input ranges up to ±VREF with common-mode range of 0 V to VREF/2 + 0.1 V.
Conversion is clocked internally-no external SCK required for core operation-while the SPI-compatible serial interface allows 3-wire CS mode or 3-wire chain mode with BUSY indicator. Power scales linearly with throughput: 3.75 µW at 100 SPS, 21.5 mW at 500 kSPS, and standby current is 1 nA at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage across full-scale range. |
| Throughput | 500 kSPS maximum-enables real-time capture of signals up to ~200 kHz Nyquist bandwidth. |
| INL | ±1.5 LSB max (±23 ppm of FSR)-ensures <0.004% end-point linearity error for precision measurement systems. |
| Dynamic Range | 96.5 dB-supports >15.7 ENOB with inputs shorted, critical for low-noise sensor interfaces. |
| SNR / THD | 95.5 dB SNR and −118 dB THD at 20 kHz-meets Class I medical and industrial instrumentation requirements. |
| Analog Input | True differential ±VREF range with 65 dB CMRR at 250 kHz-rejects common-mode noise in noisy environments. |
| Power Scaling | 3.75 µW at 100 SPS, 21.5 mW at 500 kSPS-enables adaptive power management in portable equipment. |
Pinout & Package
The AD7688BCPZRL7 is available in a 10-lead LFCSP (3 mm × 3 mm, SOT-23 footprint) with exposed paddle requiring GND connection, and also offered in 10-lead MSOP. Both packages operate from −40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; sets full-scale differential range (±VREF); requires local 10 µF decoupling. |
| VDD | Analog power supply | 4.5 V to 5.5 V; powers core ADC, track-and-hold, and internal conversion clock. |
| IN+, IN− | Differential analog inputs | Sample true differential voltage; support 0 V to VREF common-mode with ±VREF swing. |
| GND | Analog ground | Reference for REF, IN+, IN−, and VDD; must be low-impedance return path. |
| CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. Chain); enables SDO in CS mode when low. |
| SDO | Serial data output | 16-bit two's complement output synchronized to SCK; tri-state when CNV/SDI high in CS mode. |
| SCK | Serial clock input | Drives data shift-out timing; compatible with 1.8 V–5 V logic; min period 17 ns (VIO > 4.5 V). |
| SDI | Serial data input | Selects interface mode on CNV rising edge (low = Chain, high = CS); enables daisy-chaining in Chain mode. |
| VIO | Digital I/O supply | 1.8 V to VDD + 0.3 V; isolates digital interface from analog supply; defines logic thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate availability of conversion result after tCONV (≤1.6 µs); eliminates latency in closed-loop control. |
| Daisy-chain capability | Single SDO line supports multiple AD7688BCPZRL7 units via SDI-driven chain mode-reduces PCB routing and host GPIO count. |
| Ultra-low standby current | 1 nA typical at 25°C-extends battery life in sleep-wake architectures without compromising wake-up time. |
| Wide VIO compatibility | Operates with 1.8 V, 2.5 V, 3 V, or 5 V logic-enables direct interfacing to modern low-voltage microcontrollers and FPGAs. |
| Pin-for-pin compatibility | Swappable with AD7685, AD7686, and AD7687-simplifies design reuse and performance scaling within same PCB layout. |
Applications
| Portable ECG Monitor | Industrial Process Controller |
|---|---|
Use Scenario: High-resolution acquisition of low-amplitude, low-frequency biopotential signals (<5 kHz) in battery-operated wearable ECG units. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing differential lead-II signals with 95.5 dB SNR and −118 dB THD to preserve diagnostic fidelity. Use Value: 1 nA standby current extends operating life beyond 7 days on coin-cell; 500 kSPS headroom supports oversampling for noise reduction. |
Use Scenario: Multi-channel voltage/current monitoring in PLC analog input modules with tight thermal and EMI constraints. IC Role / Device Role / Timing Role: Precision differential ADC digitizing 4–20 mA loop outputs and thermocouple signals with 65 dB CMRR at 250 kHz. Use Value: True differential input rejects common-mode noise from motor drives; 2.5 ns aperture delay ensures accurate phase alignment across channels. |
| Handheld Test Equipment | High-Accuracy Data Logger |
Use Scenario: Compact multimeter or oscilloscope probe interface requiring wide dynamic range and minimal power draw. IC Role / Device Role / Timing Role: Core 16-bit converter handling ±5 V differential inputs with 96.5 dB dynamic range and no missing codes. Use Value: 3.75 µW at 100 SPS enables ultra-low-power logging modes; SPI interface simplifies integration with ARM Cortex-M hosts. |
Use Scenario: Environmental sensor node recording temperature, pressure, and strain over extended periods using energy harvesting. IC Role / Device Role / Timing Role: Low-power ADC acquiring conditioned bridge sensor outputs with ±1.5 LSB INL for calibration traceability. Use Value: Linear power scaling allows matching throughput to available energy; REF pin supports ratiometric sensing with external reference. |
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, ±1.5 LSB INL, same 10-lead MSOP/LFCSP package and pinout. | Limited to lower throughput; suitable where 500 kSPS is unnecessary and cost optimization is prioritized. | Drop-in replacement if system sampling rate ≤250 kSPS; identical interface and power profile. |
| ADS8860IDRCT | 16-bit, 1 MSPS, ±1.25 LSB INL, SPI interface, but requires external reference and separate AVDD/DVDD supplies. | Higher speed but less integrated (no internal track-and-hold, no VIO flexibility); larger 10-pin WSON package. | Preferred for higher-speed designs needing >500 kSPS; not pin-compatible-requires layout change and supply redesign. |
Compared with AD7685BRMZ, AD7688BCPZRL7 delivers double throughput and identical linearity in same footprint; versus ADS8860IDRCT, it offers superior integration (single 5 V supply, VIO flexibility, internal reference support) at the cost of 500 kSPS ceiling-making it optimal for precision-limited, power-constrained systems.
Availability
AD7688BCPZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, and process controls requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AD7688BCPZRL7 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 Wilmington, MA.
The AD7688BCPZRL7 belongs to the PulSAR™ family of precision SAR ADCs designed for high-resolution, low-power data acquisition in instrumentation, medical, and industrial applications where accuracy, speed, and power efficiency are co-optimized.
FAQ
What is the maximum sample rate supported by the AD7688BCPZRL7?
The AD7688BCPZRL7 supports a maximum throughput of 500 kSPS, corresponding to a minimum conversion cycle time of 2 µs. This is validated across the full −40°C to +85°C operating temperature range with VDD = 4.5 V to 5.5 V and VREF = VDD. At this rate, power dissipation is 21.5 mW, and dynamic performance remains within datasheet limits including 95.5 dB SNR and −118 dB THD at 20 kHz.
Does the AD7688BCPZRL7 require an external clock for conversion?
No, the AD7688BCPZRL7 contains an internal conversion clock and does not require an external clock for core ADC operation. The SCK signal is used only for serial data readout-not for sampling or conversion timing. This eliminates clock jitter sensitivity and simplifies system-level timing design, making the AD7688BCPZRL7 especially robust in noise-sensitive applications.
Can the AD7688BCPZRL7 operate with a 1.8 V digital interface while using a 5 V analog supply?
Yes, the AD7688BCPZRL7 supports independent analog (VDD = 5 V) and digital I/O (VIO = 1.8 V) supplies. Its digital inputs accept 1.8 V logic levels, and outputs drive 1.8 V–compatible receivers with VOL ≤ 0.4 V and VOH ≥ VIO − 0.3 V. This allows seamless interfacing with low-voltage microcontrollers without level-shifting, preserving signal integrity and reducing BOM count.
What is the purpose of the CNV pin on the AD7688BCPZRL7?
The CNV pin on the AD7688BCPZRL7 serves three critical functions: (1) its rising edge initiates analog sampling and starts conversion; (2) it selects the serial interface mode (CS or Chain) in conjunction with SDI state; and (3) in CS mode, it enables the SDO output when held low. This multifunction pin reduces control-line count and enables flexible, low-pin-count system integration for the AD7688BCPZRL7.
Is the AD7688BCPZRL7 pin-compatible with other PulSAR ADCs?
Yes, the AD7688BCPZRL7 is pin-for-pin compatible with AD7685, AD7686, and AD7687 in both 10-lead MSOP and 10-lead LFCSP packages. This allows drop-in upgrades across the family-for example, replacing AD7685 (250 kSPS) with AD7688BCPZRL7 (500 kSPS) without PCB revision-while maintaining identical power, interface, and layout requirements.
AD7688BCPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
AD7688BCPZRL7 FAQ
1.How can I place an order for AD7688BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7688BCPZRL7 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 AD7688BCPZRL7 reliable?
The price and inventory of AD7688BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7688BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7688BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7688BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7688BCPZRL7?
AD7688BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7688BCPZRL7 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 AD7688BCPZRL7?
For technical support, including AD7688BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7688BCPZRL7 requirements.
6.How does Aetrix verify that AD7688BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7688BCPZRL7 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 AD7688BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7688BCPZRL7?
All AD7688BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7688BCPZRL7, 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 AD7688BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7688BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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