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Analog Devices Inc. AD7687BCPZRL7
- Part No.:
- AD7687BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7687BCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,408
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Product details
Overview
AD7687BCPZRL7 from Analog Devices is a 16-bit, single-supply, successive-approximation analog-to-digital converter (ADC) with true differential input, ±VREF range, and no missing codes. It delivers 250 kSPS throughput, ±1.5 LSB max INL, 95.5 dB SNR at 20 kHz, and operates from 2.3 V to 5.5 V supply with 1.8 V–5 V logic interface - ideal for high-precision, low-power data acquisition in portable instrumentation.
For engineers reviewing the AD7687BCPZRL7 datasheet, AD7687BCPZRL7 pinout, AD7687BCPZRL7 application, or AD7687BCPZRL7 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for battery-powered medical instruments, process control sensors, and embedded test equipment.
Technical Context
The AD7687BCPZRL7 uses a charge redistribution SAR architecture with integrated track-and-hold, delivering zero pipeline delay and 1.8 µs transient response to full-scale steps. Its differential input stage supports true bipolar operation (−VREF to +VREF) and achieves 65 dB CMRR at 250 kHz, enabling accurate measurement in noisy industrial environments.
It features a proprietary SPI/QSPI/MICROWIRE/DSP-compatible serial interface with daisy-chain capability and optional BUSY indicator via SDI pin. Power consumption scales linearly with throughput: 1.35 mW at 2.5 V/100 kSPS and only 1.4 µW at 2.5 V/100 SPS - critical for energy-constrained systems.
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 | 250 kSPS at VDD = 4.5–5.5 V - enables real-time sampling of audio-band and control-loop signals. |
| INL | ±1.5 LSB max (±23 ppm of FSR) - ensures <0.0023% absolute linearity error for precision sensor interfacing. |
| SNR | 95.5 dB at 20 kHz, VREF = 5 V - supports >15.8 ENOB for high-fidelity signal capture in instrumentation. |
| Analog Input Range | True differential ±VREF, with common-mode range 0 to VREF/2 + 0.1 V - allows flexible reference scaling and rail-to-rail input handling. |
| Power Dissipation | 1.35 mW at 2.5 V/100 kSPS; 1.4 µW at 2.5 V/100 SPS - enables multi-year battery life in portable devices. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible, 3-/4-wire or daisy-chain mode, with BUSY indicator - simplifies host MCU integration without FIFO buffering. |
Pinout & Package
AD7687BCPZRL7 is packaged in a 10-lead MSOP (3 mm × 3 mm), RoHS-compliant, with exposed paddle not present (MSOP variant). Pin functions are validated per Analog Devices Rev. E datasheet Figure 4 and Table 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog Input | External reference voltage input (0.5 V to VDD); requires 10 µF decoupling capacitor for stable conversion accuracy. |
| 2 VDD | Power Supply | Main analog/digital supply (2.3 V–5.5 V); powers internal track-and-hold, DAC, and logic core. |
| 3 IN+ | Analog Input | Differential positive input; accepts −VREF to +VREF relative to IN−, with 65 dB CMRR at 250 kHz. |
| 4 IN− | Analog Input | Differential negative input; defines common-mode baseline and enables true bipolar measurement. |
| 5 GND | Power Ground | Analog and digital ground reference; must be low-impedance and separated from noisy digital returns. |
| 6 CNV | Digital Input | Convert trigger and interface mode selector; rising edge initiates sampling and determines CS vs. chain mode via SDI state. |
| 7 SDO | Digital Output | Serial data output (16-bit two's complement); doubles as BUSY indicator when enabled in chain mode. |
| 8 SCK | Digital Input | Serial clock input; controls data shift timing; SCK state at CNV edge enables/disables BUSY feature. |
| 9 SDI | Digital Input | Serial data input and interface mode control; low = chain mode (daisy-chain), high = CS mode (chip-select). |
| 10 VIO | Power Supply | Independent I/O voltage supply (1.8 V–5 V); isolates ADC logic from host MCU voltage domain. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-latency conversion results available immediately after tCONV - essential for closed-loop control and multiplexed channel synchronization. |
| Daisy-chain capability | Multiple AD7687BCPZRL7 units share one SDO line using SDI as data-in; eliminates bus contention and reduces PCB routing complexity. |
| Ultra-low standby current | 1 nA typical at 5 V - enables microamp-level system sleep states without sacrificing wake-up speed or accuracy. |
| Wide supply and logic compatibility | VDD = 2.3–5.5 V and VIO = 1.8–5 V - supports direct interfacing with modern low-voltage MCUs (e.g., ARM Cortex-M0+) without level shifters. |
| True differential input architecture | Rejects common-mode noise up to 250 kHz while maintaining ±VREF full-scale range - improves immunity in motor drive and sensor front-end applications. |
Applications
| Portable Medical Instrumentation | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered ECG front-end acquiring low-amplitude biopotential signals with high common-mode interference. IC Role / Device Role / Timing Role: Precision 16-bit SAR ADC digitizing differential electrode inputs with 95.5 dB SNR and 65 dB CMRR at 250 kHz sampling. Use Value: Enables >15-bit effective resolution in compact handheld devices while consuming only 1.35 mW at 100 kSPS - extending battery life beyond 72 hours. |
Use Scenario: Remote pressure/temperature transmitter in hazardous area requiring intrinsic safety and long-term calibration stability. IC Role / Device Role / Timing Role: High-linearity ADC converting 4–20 mA loop-derived sensor outputs with ±1.5 LSB INL over −40°C to +85°C. Use Value: Eliminates need for external gain/offset trimming due to guaranteed monotonicity and <0.0023% FSR linearity error across full operating range. |
| Automated Test Equipment (ATE) | Energy Metering Reference Channel |
Use Scenario: Modular DAQ card capturing transient waveforms during semiconductor device characterization. IC Role / Device Role / Timing Role: Zero-latency SAR ADC performing synchronized sampling across multiple channels with no pipeline delay or cycle-to-cycle jitter. Use Value: Supports deterministic timing for sub-microsecond event capture and eliminates inter-channel skew in multi-sensor setups. |
Use Scenario: High-accuracy metrology subsystem measuring voltage/current harmonics in Class 0.2 smart meters. IC Role / Device Role / Timing Role: Differential ADC digitizing isolated CT/PT outputs with −118 dB THD and 96.5 dB dynamic range at 5 V reference. Use Value: Meets IEC 62053-22 harmonic distortion requirements without post-processing compensation or oversampling. |
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 |
|---|---|---|---|
| AD7685BCPZRL7 | 100 kSPS max throughput, same 10-lead MSOP package and pinout - lower speed but identical interface and power profile. | Best suited for cost-sensitive, lower-bandwidth applications like environmental monitoring where 250 kSPS is unnecessary. | Select AD7685BCPZRL7 when system sampling rate ≤100 kSPS and board layout reuse is prioritized. |
| AD7688BCPZRL7 | 500 kSPS throughput, same family architecture and pinout - higher speed with increased power (18 mW at 5 V/500 kSPS) and slightly reduced SNR (94 dB). | Required for ultrasound imaging or high-speed vibration analysis where >250 kSPS is mandatory. | Choose AD7688BCPZRL7 only if application demands ≥500 kSPS and can accommodate higher power and thermal load. |
Compared with AD7685BCPZRL7 and AD7688BCPZRL7, the AD7687BCPZRL7 uniquely balances 250 kSPS speed, 95.5 dB SNR, and 1.35 mW power - making it the optimal choice for portable instrumentation where bandwidth, fidelity, and energy efficiency intersect.
Availability
AD7687BCPZRL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial process monitoring, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7687BCPZRL7 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 AD7687BCPZRL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-power data acquisition in space-constrained, battery-operated, and noise-sensitive applications.
FAQ
What is the maximum sampling rate of the AD7687BCPZRL7?
The AD7687BCPZRL7 achieves a maximum throughput of 250 kSPS when operated with VDD between 4.5 V and 5.5 V. At lower supply voltages (2.3 V–4.5 V), the maximum rate drops to 200 kSPS. This is specified in Table 2 of the Rev. E datasheet and reflects actual conversion timing (tCYC = 4 µs minimum at 5 V).
Does the AD7687BCPZRL7 require an external reference voltage?
Yes, the AD7687BCPZRL7 requires an external reference voltage applied to the REF pin. The reference range is 0.5 V to VDD, and it directly sets the full-scale differential input range (±VREF). A 10 µF decoupling capacitor is mandatory at the REF pin to maintain DC accuracy and AC performance.
Is the AD7687BCPZRL7 pin-compatible with other PulSAR ADCs?
Yes, the AD7687BCPZRL7 is pin-for-pin compatible with AD7685BCPZRL7 (100 kSPS), AD7686BCPZRL7 (250 kSPS, pseudo-differential), and AD7688BCPZRL7 (500 kSPS), as confirmed in the General Description and Table 1 of the Rev. E datasheet - enabling drop-in upgrades or downgrades within the same PCB layout.
What digital interface modes does the AD7687BCPZRL7 support?
The AD7687BCPZRL7 supports three interface configurations: CS mode (3- or 4-wire), Chain mode (daisy-chain), and BUSY indicator mode - all selected dynamically via SDI and SCK states at the CNV rising edge. All modes are SPI/QSPI/MICROWIRE/DSP-compatible and require no external protocol translation.
How does the AD7687BCPZRL7 manage power in low-throughput applications?
The AD7687BCPZRL7 scales power linearly with throughput: it consumes just 1.4 µW at 2.5 V and 100 SPS, and its standby current is only 1 nA. This ultra-low quiescent power is achieved by powering down internal circuitry between conversions - a key enabler for multi-year battery life in remote sensing nodes.
AD7687BCPZRL7 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):
- 250k
- 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:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7687BCPZRL7 FAQ
1.How can I place an order for AD7687BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7687BCPZRL7 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 AD7687BCPZRL7 reliable?
The price and inventory of AD7687BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7687BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7687BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7687BCPZRL7 transactions.
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AD7687BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7687BCPZRL7 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 AD7687BCPZRL7?
For technical support, including AD7687BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7687BCPZRL7 requirements.
6.How does Aetrix verify that AD7687BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7687BCPZRL7 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 AD7687BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7687BCPZRL7?
All AD7687BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7687BCPZRL7, 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 AD7687BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7687BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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