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Analog Devices Inc. AD7682BCBZ-RL7
- Part No.:
- AD7682BCBZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
AD7682BCBZ-RL7.pdf
- Description:
- IC ADC 16BIT SAR 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,954
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Product details
Overview
AD7682BCBZ-RL7 from Analog Devices is a 16-bit, 4-channel, 250 kSPS successive approximation register (SAR) ADC with integrated multiplexer, internal 2.5 V/4.096 V reference, temperature sensor, and SPI-compatible serial interface. It operates from a single 2.3 V to 5.5 V supply with 1.8 V to 5.5 V logic interface and delivers ±0.4 LSB typical INL, 92.5 dB SINAD at 20 kHz, and 50 nA standby current. It targets multichannel battery-powered data acquisition in medical ECG systems.
For engineers reviewing the AD7682BCBZ-RL7 datasheet, AD7682BCBZ-RL7 pinout, AD7682BCBZ-RL7 application, or AD7682BCBZ-RL7 equivalent, key selection criteria include its 4-channel unipolar/differential/pseudobipolar input flexibility, no-pipeline-delay SAR architecture, internal reference options, low-power operation down to 3.5 mW at 2.5 V/200 kSPS, and LFCSP package compatibility with space-constrained portable instrumentation.
Technical Context
The AD7682BCBZ-RL7 implements a charge redistribution SAR architecture with no pipeline delay, enabling deterministic conversion timing and immediate result availability. Its 4-channel analog multiplexer supports configurable input modes-unipolar single-ended, differential (GND-sense), and pseudobipolar-with channel sequencer and selectable 1-pole filter for oversampling reduction.
Digital interface uses SPI/MICROWIRE/QSPI/DSP-compatible protocol with separate VIO supply (1.8 V–5.5 V), allowing direct interfacing to low-voltage microcontrollers. Internal temperature sensor output is routed to a dedicated MUX channel, and busy indicator functionality is enabled via CNV pin control during conversion.
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 (−40°C to +85°C). |
| Throughput | 250 kSPS at VDD = 4.5–5.5 V - enables real-time sampling of ECG waveforms and power line harmonics up to 125 kHz Nyquist. |
| INL | ±0.4 LSB typical (±1.5 LSB max) - ensures <±0.0023% FSR linearity error critical for precision sensor measurement accuracy. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - supports >15-bit effective resolution for high-fidelity signal capture in medical and seismic applications. |
| Power Dissipation | 3.5 mW at 2.5 V/200 kSPS - enables continuous operation on coin-cell batteries for >1 year in portable monitoring devices. |
| Analog Input Range | 0 V to VREF (unipolar), −VREF/2 to +VREF/2 (bipolar) - accommodates both ground-referenced and floating sensor outputs without external level-shifting. |
| Reference Options | Internal 2.5 V or 4.096 V (±10 ppm/°C drift), external buffered (≤VDD − 0.5 V), or external direct (0.5 V to VDD) - simplifies BOM by eliminating external reference ICs in cost-sensitive designs. |
Pinout & Package
AD7682BCBZ-RL7 is housed in a 20-lead 4 mm × 4 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) for thermal and mechanical reliability. Pinout is fully defined per Analog Devices Rev. K datasheet Figure 4 and Table 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 20) | Core analog power supply | 2.3–5.5 V supply; minimum 3.0 V required when internal 2.5 V reference is enabled; requires 10 μF + 100 nF decoupling. |
| REF (Pin 2) | Reference input/output | Outputs selectable 2.5 V or 4.096 V internal reference; accepts buffered external reference up to VDD − 0.5 V; requires 10 μF decoupling capacitor. |
| REFIN (Pin 3) | Internal reference buffer input | Provides unbuffered internal bandgap voltage (2.5 V or 4.096 V); requires 0.1 μF decoupling; used only when internal reference is active. |
| GND (Pins 4, 5) | Analog and digital ground | Common return path for analog inputs, reference, and digital I/O; must be connected to low-impedance system ground plane. |
| IN0–IN3 (Pins 16, 18, 9, 6) | Analog input channels | Four single-ended or differential analog inputs; support unipolar, differential (GND-sense), and pseudobipolar configurations via configuration register. |
| COM (Pin 10) | Common-mode reference | Defines common-mode point for all channels (0 V or VREF/2); enables true differential measurements without external resistors. |
| CNV (Pin 11) | Conversion start trigger | Rising edge initiates conversion; held low during conversion enables busy indicator mode for host synchronization. |
| DIN (Pin 12) | Serial configuration input | Writes to 14-bit configuration register during or after conversion; supports dynamic reconfiguration of input mode, bandwidth, and filtering. |
| SCK (Pin 13) | Serial clock input | Drives SPI interface timing; compatible with standard microcontroller SPI peripherals; supports up to 50 MHz clock rate. |
| SDO (Pin 14) | Serial data output | Outputs 16-bit conversion result MSB-first; format is straight binary (unipolar) or two's complement (bipolar); tri-state capable. |
| VIO (Pin 15) | Digital I/O supply | Independent 1.8–5.5 V supply for digital interface; isolates ADC core from host logic noise and enables mixed-voltage system integration. |
| NC (Pins 7, 8, 17, 19) | No internal connection | Not bonded internally; must be left floating or tied to GND per PCB layout best practices; no electrical function. |
| EPAD | Exposed thermal pad | Not electrically connected; soldering to system ground plane improves thermal dissipation and mechanical reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-channel analog multiplexer | Enables sequential scanning of four sensors (e.g., ECG leads) without external analog switches or op-amp buffers, reducing component count and board area. |
| Selectable 1-pole digital filter | Reduces aliasing and noise in oversampled applications (e.g., power line monitoring), eliminating need for external anti-aliasing filters in many cases. |
| Internal temperature sensor (TEMP) | Provides calibrated on-die temperature reading via dedicated MUX channel (INx = TEMP), enabling self-calibration and thermal compensation without external sensors. |
| No pipeline delay SAR architecture | Delivers deterministic conversion latency (2.2 µs typical), supporting time-critical closed-loop control and real-time waveform analysis without latency uncertainty. |
| Low-power standby mode (50 nA) | Allows rapid wake-up from deep sleep in battery-operated devices (e.g., wearable health monitors), extending operational lifetime between charges. |
Applications
| Medical ECG/EKG Monitoring | Battery-Powered Portable DAS |
|---|---|
Use Scenario: Continuous 4-lead ECG acquisition in handheld or wearable diagnostic devices with Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Primary 16-bit analog front-end digitizer for biopotential signals; performs synchronized 4-channel sampling at ≥1 kSPS with programmable gain and filtering. Use Value: Integrated reference and temperature sensor eliminate 3 external components; 3.5 mW power enables >12-hour runtime on 200 mAh Li-ion cell. |
Use Scenario: Field-deployable environmental sensor node measuring temperature, pressure, and humidity with local SD logging. IC Role / Device Role / Timing Role: Multichannel data acquisition hub interfacing to multiple analog transducers; uses channel sequencer for automatic round-robin sampling. Use Value: 250 kSPS throughput allows oversampling for noise reduction; internal 4.096 V reference provides 16-bit resolution over full 0–5 V sensor range. |
| Industrial Power Line Monitoring | Seismic Data Acquisition |
Use Scenario: Three-phase voltage/current harmonic analysis in smart grid edge meters with Class 0.2 accuracy requirements. IC Role / Device Role / Timing Role: High-precision ADC for isolated current/voltage sensing circuits; configured in differential mode to reject common-mode noise on long sensor lines. Use Value: ±0.4 LSB INL and 92.5 dB SINAD meet IEC 62053-22 harmonic distortion limits; 125 dB channel-to-channel crosstalk prevents interphase interference. |
Use Scenario: Low-noise geophone array digitization in oil/gas exploration equipment operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Low-power, high-dynamic-range ADC for seismic vibration signals; uses internal temperature sensor for real-time gain calibration across temperature extremes. Use Value: 93.8 dB dynamic range captures weak seismic reflections amid high-amplitude noise; LFCSP package withstands mechanical shock and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7689BCPZ-RL7 | 8-channel variant with identical 16-bit resolution, 250 kSPS, and LFCSP package; adds IN4–IN7 pins and extended temperature option (−40°C to +125°C). | Supports higher channel count systems (e.g., 8-lead ECG, multi-zone structural monitoring); requires PCB redesign due to different pinout and additional analog inputs. | Select AD7689BCPZ-RL7 when >4 channels are needed and board layout can accommodate larger pin count; same firmware interface simplifies migration. |
| ADS8684IPWR | Texas Instruments 16-bit, 4-channel SAR ADC with 500 kSPS throughput, integrated PGA (±10.24 V range), and SPI interface; consumes 15 mW at 5 V/500 kSPS. | Offers programmable gain amplifier for direct connection to ±10 V industrial sensors; lacks internal temperature sensor and selectable reference; wider supply range (4.75–5.25 V). | Choose ADS8684IPWR for high-voltage sensor interfaces requiring on-chip amplification; AD7682BCBZ-RL7 remains preferred for ultra-low-power, reference-integrated, or temperature-compensated designs. |
Compared with AD7689BCPZ-RL7, AD7682BCBZ-RL7 offers lower channel count but smaller footprint and identical performance per channel; versus ADS8684IPWR, it trades off PGA flexibility for lower power, integrated reference, and on-die temperature sensing-making it optimal for compact, battery-sensitive, self-calibrating systems.
Availability
AD7682BCBZ-RL7 is available at Aetrix Electronics and suitable for medical instrumentation, portable data acquisition, and industrial power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7682BCBZ-RL7 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7682 is part of Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for low-power, multichannel data acquisition systems where accuracy, small size, and integrated features reduce system complexity and bill-of-materials cost.
FAQ
What is the maximum sample rate of the AD7682BCBZ-RL7?
The AD7682BCBZ-RL7 achieves 250 kSPS maximum throughput when powered from VDD = 4.5 V to 5.5 V. At lower supplies (2.3 V to 4.5 V), the maximum rate drops to 200 kSPS. This is specified in Table 2 of the Rev. K datasheet and applies across the full −40°C to +85°C operating range. The AD7682BCBZ-RL7 maintains this rate with no pipeline delay, delivering deterministic timing for real-time control loops.
Does the AD7682BCBZ-RL7 require an external reference voltage?
No, the AD7682BCBZ-RL7 includes an internal selectable 2.5 V or 4.096 V reference with ±10 ppm/°C drift, eliminating the need for external reference ICs in most applications. When enabled, REF (Pin 2) outputs the selected voltage and requires a 10 μF decoupling capacitor. External references (0.5 V to VDD) or buffered references (up to VDD − 0.5 V) may also be used via the REFIN pin for higher precision or custom ranges.
How many analog input channels does the AD7682BCBZ-RL7 support?
The AD7682BCBZ-RL7 supports exactly four analog input channels (IN0–IN3), as confirmed by the AD7682-specific pin mapping in Table 8 of the Rev. K datasheet. Unlike the AD7689 (8-channel), the AD7682BCBZ-RL7 has NC connections at Pins 7, 8, 17, and 19. All four channels are configurable as unipolar single-ended, differential (GND-sense), or pseudobipolar via the configuration register.
What package type is used for the AD7682BCBZ-RL7?
The AD7682BCBZ-RL7 is supplied in a 20-lead 4 mm × 4 mm lead frame chip scale package (LFCSP), identified by the "CBZ" suffix in the part number. This package includes an exposed thermal pad (EPAD) that must be soldered to the PCB ground plane for optimal thermal performance and mechanical reliability. The LFCSP footprint is documented in Figure 4 and Outline Dimensions section of the Rev. K datasheet.
Can the AD7682BCBZ-RL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7682BCBZ-RL7 supports 1.8 V digital I/O via its independent VIO supply pin (Pin 15), which accepts 1.8 V to 5.5 V. When VIO = 1.8 V, DIN and SCK inputs recognize logic high at ≥1.26 V and logic low at ≤0.54 V, while SDO output drives VOH ≥1.5 V and VOL ≤0.4 V under 500 µA load. This enables seamless SPI communication with 1.8 V MCUs without level shifters.
AD7682BCBZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- -
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-WLCSP (2.39x2.39)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7682BCBZ-RL7 FAQ
1.How can I place an order for AD7682BCBZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7682BCBZ-RL7 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 AD7682BCBZ-RL7 reliable?
The price and inventory of AD7682BCBZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7682BCBZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7682BCBZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7682BCBZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7682BCBZ-RL7?
AD7682BCBZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7682BCBZ-RL7 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 AD7682BCBZ-RL7?
For technical support, including AD7682BCBZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7682BCBZ-RL7 requirements.
6.How does Aetrix verify that AD7682BCBZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7682BCBZ-RL7 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 AD7682BCBZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7682BCBZ-RL7?
All AD7682BCBZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7682BCBZ-RL7, 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 AD7682BCBZ-RL7 part is unused and in its original packaging.
Return procedure for AD7682BCBZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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