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Analog Devices Inc. AD7690BCPZRL7
- Part No.:
- AD7690BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7690BCPZRL7.pdf
- Description:
- IC ADC 18BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,212
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Product details
Overview
AD7690BCPZRL7 from Analog Devices is an 18-bit, successive approximation analog-to-digital converter (ADC) with true differential input, ±1.5 LSB INL, 400 kSPS throughput, and single 5 V supply operation. It delivers 102 dB dynamic range at full speed and supports 1.8 V to 5 V logic via separate VIO pin, enabling direct interface with low-voltage microcontrollers in precision data acquisition systems.
For engineers reviewing the AD7690BCPZRL7 datasheet, AD7690BCPZRL7 pinout, AD7690BCPZRL7 application, or AD7690BCPZRL7 equivalent, this page provides verified specifications, validated pin functions, confirmed LFCSP-10 package mapping, real-world use cases in seismic and medical instrumentation, and two technically documented alternative ADCs for design flexibility.
Technical Context
The AD7690BCPZRL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, delivering zero pipeline delay and no missing codes across its full 18-bit range. Its differential input accepts ±VREF swing with 65 dB CMRR at 250 kHz and supports external reference voltages from 0.5 V to VDD.
Conversion is initiated by the CNV rising edge, and the SPI-compatible serial interface operates in either CS mode (3- or 4-wire) or daisy-chain mode, with optional busy indicator. The device scales power linearly with throughput-consuming only 4.25 µW at 100 SPS and 20 mW at 400 kSPS-while maintaining 101.5 dB SINAD at 1 kHz with 5 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes-guarantees monotonicity and full code coverage for high-fidelity signal capture. |
| Throughput | 400 kSPS maximum-enables real-time sampling of wideband sensor signals up to ~190 kHz Nyquist frequency. |
| INL | ±1.5 LSB max (±6 ppm of FSR)-ensures accurate end-point linearity critical for calibration-sensitive instruments. |
| Dynamic Range | 102 dB at 400 kSPS-supports >16 ENOB in high-speed acquisition without oversampling. |
| Power Dissipation | 20 mW at 400 kSPS, 4.25 µW at 100 SPS-enables ultra-low-power operation in battery-powered DVMs and portable medical devices. |
| Reference Range | 0.5 V to VDD-allows flexible scaling from low-noise 2.5 V references to full 5 V rails while maintaining accuracy. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP compatible with 1.8–5 V VIO-eliminates level-shifting circuitry when interfacing with modern MCUs. |
Pinout & Package
The AD7690BCPZRL7 is housed in a 10-lead 3 mm × 3 mm LFCSP (lead-frame chip-scale package) with exposed pad, rated for −40°C to +85°C operation. Pin 1 is REF; the EPAD must be soldered to ground for thermal and reliability performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; requires local 10 µF decoupling-sets full-scale range and directly impacts gain error and noise floor. |
| VDD | Analog power supply | 4.75–5.25 V; powers core ADC and internal track-and-hold-must be filtered independently from digital supplies. |
| IN+, IN− | Differential analog inputs | True differential pair with ±VREF range and 65 dB CMRR-rejects common-mode noise in noisy industrial environments. |
| GND | Analog ground reference | Single-point return for REF, IN+, IN−, and VDD-critical for minimizing ground bounce in high-resolution conversion. |
| CNV | Convert control input | Rising edge initiates sampling and selects interface mode (CS vs. chain)-timing-critical for synchronization in multi-ADC systems. |
| SDO | Serial data output | 18-bit twos-complement MSB-first output synchronized to SCK-drives standard SPI peripherals without additional logic. |
| SCK | Serial clock input | Accepts up to 66.7 MHz (15 ns period); timing varies with VIO voltage-enables high-speed readout with minimal bus overhead. |
| SDI | Serial data input / mode select | Configures interface mode on CNV edge; enables daisy-chaining-reduces GPIO count when connecting multiple AD7690BCPZRL7 units. |
| VIO | Digital I/O supply | 1.8–5 V independent logic rail-permits direct connection to 1.8 V FPGA I/O banks or 3.3 V MCU peripherals without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion-enables deterministic latency for closed-loop control and time-critical trigger applications. |
| Oversampled dynamic range | 125 dB at 1 kSPS-achieves 20-bit noise-free resolution for high-precision DC measurements in weigh scales and strain gauges. |
| Standby current | 1 nA typical-extends battery life in intermittent-sampling applications such as environmental monitoring nodes. |
| True differential input | ±VREF range with 0 V to VREF common-mode support-simplifies front-end design by eliminating need for level-shifting amplifiers. |
| Pin-for-pin compatibility | With AD7691, AD7982, AD7687, AD7688, and AD7693-allows hardware reuse across 16- and 18-bit PulSAR families during design iteration. |
Applications
| Seismic Data Acquisition | Portable Medical Instruments |
|---|---|
Use Scenario: High-channel-count geophone arrays capturing low-amplitude earth vibrations over extended deployments. IC Role / Device Role / Timing Role: Primary digitizer for low-noise, wide-dynamic-range analog sensor outputs with precise timing alignment across channels. Use Value: 102 dB dynamic range at 400 kSPS enables detection of sub-microvolt signals buried in thermal noise; low standby current extends field battery life. | Use Scenario: Battery-powered ECG/EEG monitors requiring clinical-grade signal fidelity and long operational runtime. IC Role / Device Role / Timing Role: High-resolution front-end ADC converting amplified biopotential signals with minimal added noise or distortion. Use Value: 101.5 dB SINAD and −125 dB THD preserve waveform morphology for accurate arrhythmia detection; 4.25 µW at 100 SPS minimizes power draw. |
| Digital Multimeters (DVMs) | Industrial Process Instrumentation |
Use Scenario: 6½-digit handheld DVMs performing precision DC voltage/current measurements with auto-ranging and fast settling. IC Role / Device Role / Timing Role: Core measurement engine handling dual-slope or SAR-based integration with programmable reference scaling. Use Value: ±1.5 LSB INL ensures traceable accuracy per metrology standards; 20-bit noise-free resolution at 1 kSPS supports stable 100 ppm readings. | Use Scenario: Distributed I/O modules acquiring temperature, pressure, and flow sensor outputs in factory automation systems. IC Role / Device Role / Timing Role: Isolated channel ADC providing galvanically separated, high-accuracy analog input to PLC backplanes. Use Value: True differential inputs reject common-mode noise from motor drives and VFDs; SPI interface simplifies integration with ARM-based controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7691BCPZRL7 | Same 18-bit resolution and LFCSP-10 package, but rated for 100 kSPS max throughput and lower power (1.25 mW at 100 kSPS). | Better suited for ultra-low-power, lower-bandwidth applications where 400 kSPS is unnecessary. | Select AD7691BCPZRL7 when system sampling rate ≤100 kSPS and energy efficiency is prioritized over speed. |
| AD7982BRMZ | 18-bit, 400 kSPS, but uses pseudo-differential input (single-ended IN+ referenced to IN−), lacks true differential architecture. | Requires external driver for true differential signals; less effective at rejecting common-mode interference. | Choose AD7982BRMZ only if front-end signal conditioning already provides single-ended drive and board space constraints favor MSOP-10. |
Compared with AD7691BCPZRL7 and AD7982BRMZ, the AD7690BCPZRL7 uniquely combines full 400 kSPS throughput, true differential input, and 102 dB dynamic range in a pin-compatible LFCSP-10 package-making it the optimal choice for high-fidelity, high-speed, noise-immune data acquisition where both bandwidth and precision are non-negotiable.
Availability
AD7690BCPZRL7 is available at Aetrix Electronics and suitable for seismic sensing, portable medical instrumentation, and high-accuracy digital multimeters requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.
Supply support for AD7690BCPZRL7 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 facilities worldwide.
The AD7690BCPZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for applications demanding high resolution, low power, and robust noise immunity in space-constrained, battery-operated, or industrial environments.
FAQ
What is the maximum sampling rate supported by the AD7690BCPZRL7?
The AD7690BCPZRL7 supports a maximum throughput of 400 kSPS, with conversion time from CNV rising edge to valid data output specified at 2.1 µs maximum. This enables accurate digitization of signals with bandwidths up to ~190 kHz under Nyquist criteria, making it suitable for high-fidelity sensor data acquisition and instrumentation applications where speed and resolution are both critical. The AD7690BCPZRL7 maintains full 18-bit performance at this rate.
Does the AD7690BCPZRL7 require an external reference voltage?
Yes, the AD7690BCPZRL7 requires an external reference voltage applied to the REF pin, which sets the full-scale input range. The REF voltage can range from 0.5 V to VDD (up to 5.25 V), and must be decoupled with a minimum 10 µF capacitor. Using a stable, low-noise reference-such as the ADR4550-is essential to achieve the specified ±1.5 LSB INL and 102 dB dynamic range. The AD7690BCPZRL7 does not include an internal reference.
Can the AD7690BCPZRL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7690BCPZRL7 supports direct interface with 1.8 V logic through its dedicated VIO pin, which accepts 1.8 V to 5 V. When VIO = 1.8 V, the digital interface remains fully SPI-compatible with appropriate timing margins (e.g., SCK period ≥20 ns). This eliminates level-shifting components and simplifies system design for ultra-low-voltage embedded platforms-confirmed in the AD7690BCPZRL7 datasheet Table 3 and Digital Inputs section.
What package type is used for the AD7690BCPZRL7?
The AD7690BCPZRL7 uses a 10-lead 3 mm × 3 mm LFCSP (lead-frame chip-scale package) with exposed pad, designated as CP-10-3. This compact, thermally enhanced package supports high-density PCB layouts and requires the EPAD to be soldered to the PCB ground plane for optimal thermal performance and reliability. It is pin-for-pin compatible with the MSOP-10 variant (AD7690BRMZ), but the AD7690BCPZRL7 specifically ships in LFCSP.
How does the AD7690BCPZRL7 handle power management in low-duty-cycle applications?
The AD7690BCPZRL7 features ultra-low standby current of 1 nA typical, allowing aggressive power cycling between conversions. In low-duty-cycle applications-such as periodic sensor polling-the device can be placed in standby between samples, reducing average power to nanowatt levels. At 100 SPS, total power consumption drops to 4.25 µW, and energy per conversion is specified at 50 nJ/sample-key advantages for battery-powered AD7690BCPZRL7 deployments in remote monitoring systems.
AD7690BCPZRL7 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:
- 18
- Sampling Rate (Per Second):
- 400k
- 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:
- -
AD7690BCPZRL7 FAQ
1.How can I place an order for AD7690BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7690BCPZRL7 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 AD7690BCPZRL7 reliable?
The price and inventory of AD7690BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7690BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7690BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7690BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7690BCPZRL7?
AD7690BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7690BCPZRL7 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 AD7690BCPZRL7?
For technical support, including AD7690BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7690BCPZRL7 requirements.
6.How does Aetrix verify that AD7690BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7690BCPZRL7 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 AD7690BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7690BCPZRL7?
All AD7690BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7690BCPZRL7, 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 AD7690BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7690BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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