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Analog Devices Inc. AD7684BRMZRL7
- Part No.:
- AD7684BRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7684BRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,437
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Product details
Overview
AD7684BRMZRL7 from Analog Devices is a 16-bit, 100 kSPS charge redistribution successive approximation ADC (PulSAR®) with true differential input, ±VREF range, SPI-compatible serial interface, and 8-lead MSOP package. It operates from a single 2.7 V to 5.5 V supply, delivers ±1 LSB typical INL, 88 dB SNR at 1 kHz, and consumes only 150 μW at 10 kSPS/2.7 V - ideal for precision battery-powered data acquisition.
For engineers reviewing the AD7684BRMZRL7 datasheet, AD7684BRMZRL7 pinout, AD7684BRMZRL7 application, or AD7684BRMZRL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The AD7684BRMZRL7 implements a capacitor-based charge redistribution SAR architecture with integrated track-and-hold, enabling zero-latency conversion and no pipeline delay. Its differential input stage rejects common-mode noise, while internal conversion clocking eliminates external timing complexity.
It uses a 16-bit binary-weighted capacitive DAC array switched between GND and REF to resolve the sampled +IN/–IN voltage difference. Acquisition occurs on CS falling edge; conversion completes in 10 μs, with power scaling linearly from 150 μW (10 kSPS/2.7 V) to 4 mW (100 kSPS/5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across temperature. |
| Throughput Rate | 100 kSPS maximum - supports real-time sampling of signals up to ~40 kHz Nyquist bandwidth. |
| INL | ±3 LSB max (−40°C to +85°C) - ensures <0.005% full-scale linearity error for calibrated sensor interfaces. |
| SNR | 88 dB typical at 1 kHz (VREF = 5 V) - enables 14.8 ENOB for high-fidelity signal capture in instrumentation. |
| Supply Range | 2.7 V to 5.5 V single supply - allows direct integration with Li-ion, 3.3 V, or 5 V system rails without level-shifting. |
| Standby Current | 1 nA - enables multi-year operation in wake-on-event sensor nodes with microcontroller-controlled CS assertion. |
| Digital Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible 3-wire serial - simplifies host connection using standard peripheral libraries on ARM, Blackfin, or FPGA platforms. |
Pinout & Package
AD7684BRMZRL7 is housed in an 8-lead MSOP (3 mm × 3 mm, 0.65 mm pitch), RoHS-compliant, surface-mount package with exposed pad (not electrically connected). Pin 1 marked by dot; top-side marking includes "B84" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog Input | External reference voltage input (0.5 V to VDD); must be decoupled with ≥2.2 μF ceramic capacitor directly to GND for stable DNL performance. |
| 2 - +IN | Analog Input | Differential positive input; requires 180° phase opposition to –IN; absolute voltage range: −0.1 V to VDD + 0.1 V. |
| 3 - –IN | Analog Input | Differential negative input; must be driven 180° out-of-phase with +IN; common-mode range: 0 V to VREF/2 + 0.1 V. |
| 4 - GND | Power Ground | Analog and digital ground reference; must be low-impedance plane; separate analog/digital ground routing recommended. |
| 5 - CS | Digital Input | Active-low chip select; falling edge initiates conversion and enables DOUT; device enters shutdown upon conversion completion. |
| 6 - DOUT | Digital Output | Serial 16-bit two's complement data output; MSB-first; high-impedance when CS is high; synchronized to DCLOCK falling edge. |
| 7 - DCLOCK | Digital Input | Serial interface clock input (DCLOCK); max frequency 2.9 MHz; controls data timing; rising/falling edges both valid for sampling. |
| 8 - VDD | Power Supply | Single analog/digital supply (2.7 V to 5.5 V); requires local 100 nF ceramic decoupling placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Rejects >65 dB of 100 kHz common-mode noise - eliminates need for external instrumentation amplifiers in noisy industrial environments. |
| Zero-latency SAR conversion | No pipeline delay or cycle-to-cycle latency - enables deterministic timing for closed-loop control and multiplexed channel sequencing. |
| Linear power vs. throughput scaling | 150 μW at 10 kSPS / 2.7 V - supports ultra-low-power wake-up sampling without sacrificing resolution or accuracy. |
| Integrated track-and-hold | 400 ns acquisition time - allows direct connection to low-output-impedance sensors or op-amp drivers without external THA. |
| 1 nA standby current | Enables >10-year battery life in intermittent-sampling applications (e.g., environmental monitors) when paired with microcontroller-driven CS control. |
Applications
| Portable ECG Monitor | Industrial Process Transmitter |
|---|---|
|
Use Scenario: Continuous 16-bit sampling of differential biopotential signals from electrode pairs at ≤10 kSPS, powered by coin-cell or rechargeable Li-ion. IC Role / Device Role / Timing Role: Primary ADC capturing amplified, filtered ECG waveforms; triggered by microcontroller via CS; outputs 16-bit two's complement data over SPI. Use Value: 88 dB SNR and ±1 LSB INL preserve ST-segment morphology; 150 μW power enables >5-year operation on CR2032 with duty-cycled sampling. |
Use Scenario: 4–20 mA loop-powered field transmitter measuring pressure/temperature with HART modulation capability. IC Role / Device Role / Timing Role: High-accuracy front-end ADC for sensor excitation and measurement; referenced to precision bandgap; isolated SPI interface to HART modem MCU. Use Value: True differential input rejects common-mode noise from long sensor cables; ±VREF range accommodates ratiometric bridge outputs without gain stages. |
| Handheld Multimeter | Lab Data Logger |
|
Use Scenario: Battery-operated 6½-digit DMM performing auto-ranging DCV/ACV/Ohms measurements with sub-μV resolution. IC Role / Device Role / Timing Role: Precision SAR ADC digitizing conditioned analog inputs; CS controlled per range change; REF tied to stable 2.5 V reference. Use Value: No missing codes and ±3 LSB INL ensure monotonicity across ranges; 2.7 V operation extends runtime on dual AA cells. |
Use Scenario: Benchtop logger acquiring synchronized multi-channel sensor data (vibration, temp, strain) at 10–100 kSPS for FFT analysis. IC Role / Device Role / Timing Role: Channel-isolated ADC in modular signal conditioning module; driven by FPGA with precise DCLOCK timing and CS strobing. Use Value: 100 kSPS throughput and 88 dB SNR support 14.8-bit effective resolution for spectral analysis; MSOP footprint enables dense channel packing. |
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 |
|---|---|---|---|
| AD7687BRMZ | 250 kSPS throughput, same 16-bit resolution and MSOP-8 package; higher power (7.5 mW @ 5 V/250 kSPS); identical SPI interface and pinout. | Requires faster DCLOCK (≤5.5 MHz); better suited for higher-bandwidth applications like motor control feedback where >100 kSPS is needed. | Select AD7687BRMZ if system demands >100 kSPS with identical form factor and software compatibility; verify layout supports higher-speed digital routing. |
| ADS8860IDRCT | Texas Instruments 16-bit SAR ADC; 100 kSPS, SPI interface, but uses 10-lead VSSOP; INL ±1.5 LSB max; SNR 89 dB; requires external reference. | Not pin-compatible; different pin count and layout; lacks integrated track-and-hold - needs external driver amplifier for high-Z sources. | Choose ADS8860IDRCT only if TI ecosystem alignment or specific qualification requirements override need for drop-in replacement; expect PCB redesign and driver circuit changes. |
Compared with AD7684BRMZRL7, AD7687BRMZ offers higher speed at increased power and clock rate, while ADS8860IDRCT provides similar speed and resolution but demands board-level redesign and external signal conditioning - making AD7684BRMZRL7 optimal for space-constrained, low-power, differential-input precision systems requiring minimal BOM and layout changes.
Availability
AD7684BRMZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, and industrial process control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7684BRMZRL7 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, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD7684BRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for low-power, high-accuracy data acquisition in portable and embedded systems where resolution, linearity, and energy efficiency are critical.
FAQ
What is the minimum reference voltage supported by the AD7684BRMZRL7?
The AD7684BRMZRL7 supports a minimum reference voltage of 0.5 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 0.5 V risks degraded INL and missing codes; for optimal 16-bit performance, Analog Devices recommends VREF ≥ 2.5 V. The AD7684BRMZRL7 reference input is dynamic and must be buffered or decoupled with ≥2.2 μF ceramic capacitance to maintain DNL spec.
Does the AD7684BRMZRL7 require an external clock source?
No, the AD7684BRMZRL7 does not require an external master clock. It contains an internal conversion clock and relies solely on the externally supplied DCLOCK signal for serial data timing. The DCLOCK input (Pin 7) controls data transfer synchronization - it is not a system clock input. The AD7684BRMZRL7 generates its own sampling aperture timing internally upon CS assertion, eliminating need for external timing generators.
Can the AD7684BRMZRL7 operate with a 2.0 V supply?
The AD7684BRMZRL7 is specified for 2.7 V to 5.5 V operation, but the Absolute Maximum Ratings table permits VDD down to 2.0 V. However, Analog Devices does not guarantee performance (INL, SNR, throughput) below 2.7 V. At 2.0 V, startup behavior, reference regulation, and digital interface margins become unreliable. For robust operation, the AD7684BRMZRL7 must be powered within its specified 2.7 V–5.5 V range.
Is the AD7684BRMZRL7 pin-compatible with other PulSAR ADCs in MSOP-8?
No - the AD7684BRMZRL7 has a unique 8-pin MSOP pinout optimized for differential input and minimal footprint. While AD7680, AD7683, and AD7685 also use MSOP-8, their pin assignments differ significantly (e.g., AD7680 lacks dedicated REF pin; AD7683 uses different CS/DOUT logic). Substituting any of these requires PCB redesign and firmware adaptation. The AD7684BRMZRL7 pinout is fixed per Figure 6 of Rev. A datasheet.
How does the AD7684BRMZRL7 handle input overvoltage conditions?
The AD7684BRMZRL7 analog inputs (+IN and –IN) include ESD diodes to VDD and GND, rated for ±130 mA forward current. Absolute maximum rating is GND − 0.3 V to VDD + 0.3 V. Exceeding this causes diode conduction, risking latch-up or permanent damage if current is uncontrolled. For overvoltage protection, external series resistors (e.g., 33 Ω) and clamping diodes to rails are recommended - as shown in Figure 22 of the AD7684BRMZRL7 datasheet.
AD7684BRMZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- 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:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7684BRMZRL7 FAQ
1.How can I place an order for AD7684BRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7684BRMZRL7 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 AD7684BRMZRL7 reliable?
The price and inventory of AD7684BRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7684BRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7684BRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7684BRMZRL7 transactions.
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4.How is shipping managed for AD7684BRMZRL7?
AD7684BRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7684BRMZRL7 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 AD7684BRMZRL7?
For technical support, including AD7684BRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7684BRMZRL7 requirements.
6.How does Aetrix verify that AD7684BRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7684BRMZRL7 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 AD7684BRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7684BRMZRL7?
All AD7684BRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7684BRMZRL7, 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 AD7684BRMZRL7 part is unused and in its original packaging.
Return procedure for AD7684BRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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