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Analog Devices Inc. AD7495ARM
- Part No.:
- AD7495ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7495ARM.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
AD7495ARM from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC with on-chip 2.5 V reference, single-supply operation (2.7 V to 5.25 V), 68 dB SINAD at 300 kHz input, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It serves as a high-speed analog front-end digitizer in portable instrumentation and sensor interfaces.
For engineers reviewing the AD7495ARM datasheet, AD7495ARM pinout, AD7495ARM application, or AD7495ARM equivalent, key selection considerations include its integrated 2.5 V reference output (REF OUT), VDRIVE logic-level independence, 1 µA full power-down current, and guaranteed no-missed-codes performance across −40°C to +85°C.
Technical Context
The AD7495ARM implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, sampling triggered by CS falling edge and conversion clocked by SCLK. Its track-and-hold supports 8.3 MHz full-power bandwidth (−3 dB) and acquires full-scale steps in ≤325 ns.
It features dual supply domains: VDD powers analog and core logic (2.7 V–5.25 V), while VDRIVE independently sets digital I/O voltage (2.7 V–5.25 V), enabling direct interfacing with 3 V or 5 V processors without level shifters. REF OUT delivers 2.4625 V to 2.5375 V with 50 ppm/°C drift and 10 Ω output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise amplitude quantization |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz - enables ≥11.3 effective bits for medium-bandwidth sensor signals |
| Reference | On-chip 2.5 V ±1.5% REF OUT - eliminates external reference component and layout area |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - suitable for battery-powered systems with tight thermal budgets |
| Power-Down Current | 1 µA max - reduces standby power by >99.9% versus active mode |
| Integral Nonlinearity | ±1 LSB max (B grade) - ensures monotonicity and no missing codes over full temperature range |
Pinout & Package
AD7495ARM is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF OUT) | Reference Output | Provides buffered 2.5 V reference; requires ≥100 nF decoupling to GND; usable as system reference after buffering |
| 2 (VIN) | Analog Input | Single-ended input with 0 V to 2.5 V range; 20 pF input capacitance and ±1 µA leakage |
| 3 (GND) | Analog Ground | Primary ground reference for analog circuitry; must be connected to low-impedance analog ground plane |
| 4 (SCLK) | Serial Clock Input | Drives both data transfer and internal conversion timing; accepts 10 kHz–20 MHz clock with 40/60 duty cycle |
| 5 (SDATA) | Serial Data Output | 3-state output delivering 12-bit MSB-first result preceded by four zeros; driven by VDRIVE domain |
| 6 (VDRIVE) | Digital I/O Supply | Sets logic thresholds independently of VDD; allows direct connection to 3 V or 5 V host processor I/O |
| 7 (CS) | Chip Select (Active Low) | Initiates conversion on falling edge; frames serial data transfer; enables multi-device SPI bus sharing |
| 8 (VDD) | Analog & Core Power | Supplies ADC core, track-and-hold, and reference; operates from 2.7 V to 5.25 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5 V reference | Eliminates external reference IC and associated decoupling, reducing BOM count and board area |
| VDRIVE logic supply independence | Enables seamless SPI interface to mixed-voltage systems without level translators or additional power rails |
| No pipeline delay | Ensures deterministic latency (≤800 ns conversion time) critical for closed-loop control and trigger-based acquisition |
| Three power modes | Supports dynamic power scaling: normal (2 mA), partial power-down (230 µA), and full shutdown (1 µA) |
| Guaranteed no missing codes | Validated across −40°C to +85°C and full supply range, simplifying calibration and validation in industrial environments |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Digitizing ECG, pulse oximetry, or temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring conditioned biopotential signals at up to 1 MSPS with minimal power draw. Use Value: On-chip 2.5 V reference and 1 µA shutdown current extend battery life while maintaining measurement accuracy across operating temperature. | Use Scenario: Capturing vibration, pressure, or environmental sensor data in unattended field-deployed loggers. IC Role / Device Role / Timing Role: High-fidelity signal digitizer interfaced to microcontroller via SPI, supporting burst-mode acquisition and deep-sleep wake-up. Use Value: VDRIVE independence allows direct connection to 3.3 V MCU I/O; no-missing-codes guarantee ensures reliable long-term data integrity. |
| Optical Sensor Interfaces | Wireless Sensor Node Front Ends |
Use Scenario: Converting photodiode or ambient light sensor outputs in smart lighting or proximity detection modules. IC Role / Device Role / Timing Role: Low-noise, wide-input-bandwidth ADC capturing fast transient optical events with 68 dB SINAD at 300 kHz. Use Value: 8.3 MHz full-power bandwidth supports accurate digitization of modulated optical carriers; MSOP package fits compact optical subassemblies. | Use Scenario: Sampling analog sensor outputs prior to RF transmission in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Energy-efficient ADC enabling short-duration active periods followed by ultra-low-power sleep states. Use Value: 6 mW active power at 3 V and 1 µA shutdown current maximize node lifetime; SPI compatibility simplifies integration with common wireless SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7475ARM | External 2.5 V reference required; lower power (4.5 mW @ 3 V); same pinout but REF IN instead of REF OUT | Requires external reference design and decoupling; better suited when system already provides precision reference | Select when reference sharing across multiple converters is needed or when lowest possible active power is critical |
| ADS7822U | 2.7 V–5.5 V supply; 1 MSPS; no internal reference; 10-bit resolution; different SPI timing and pinout | Lacks on-chip reference and 12-bit resolution; requires external reference and gain stage for equivalent dynamic range | Consider only if 10-bit resolution suffices and board space permits external reference + op-amp signal conditioning |
Compared with AD7475ARM and ADS7822U, the AD7495ARM uniquely combines integrated 2.5 V reference, 12-bit resolution, and identical MSOP footprint-enabling drop-in replacement where reference integration and code compatibility are required, without altering PCB layout or firmware timing.
Availability
AD7495ARM is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial data acquisition requiring stable component supply and long-lifecycle support.
Supply support for AD7495ARM 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The AD7495ARM belongs to Analog Devices' precision SAR ADC product line, designed specifically for portable and power-sensitive applications demanding high speed, low power, and integrated reference functionality without sacrificing DC accuracy or AC performance.
FAQ
What is the reference voltage source for AD7495ARM?
The AD7495ARM integrates a trimmed 2.5 V bandgap reference, delivered at the REF OUT pin (Pin 1). This output ranges from 2.4625 V to 2.5375 V (±1.5%), exhibits 50 ppm/°C temperature drift, and requires ≥100 nF ceramic decoupling to GND. Unlike the AD7475ARM, it does not require an external reference, simplifying system design and reducing component count.
Does AD7495ARM support independent logic and analog supply voltages?
Yes, AD7495ARM supports independent supply domains: VDD (Pin 8) powers the analog core and reference (2.7 V–5.25 V), while VDRIVE (Pin 6) sets digital I/O thresholds (also 2.7 V–5.25 V). This allows direct interfacing with 3 V microcontrollers even when VDD is 5 V, eliminating level-shifting circuitry and reducing design complexity.
What is the guaranteed missing-code performance of AD7495ARM?
The AD7495ARM guarantees no missing codes across its full 12-bit range under all specified conditions: −40°C to +85°C, VDD = 2.7 V to 5.25 V, and with proper REF OUT decoupling. This is validated per the B-grade specification (±1.5/−0.9 LSB DNL max), ensuring monotonic transfer function and reliable operation in closed-loop control or calibration-critical applications.
How does the power-down mode operate in AD7495ARM?
The AD7495ARM offers three power states: Normal (2 mA max at 3 V), Partial Power-Down (230 µA max static), and Full Power-Down (1 µA max). Full shutdown is entered by holding CS high while SCLK is inactive; wake-up time is 650 µs. This enables aggressive power gating in intermittent-sampling applications such as wireless sensor nodes or portable data loggers.
Is AD7495ARM pin-compatible with AD7475ARM?
Yes, AD7495ARM and AD7475ARM share identical 8-lead MSOP/SOIC footprints and pin assignments, but Pin 1 differs: AD7495ARM uses REF OUT, while AD7475ARM uses REF IN. Swapping them requires redesigning the reference path-external decoupling for AD7475ARM versus internal reference buffering for AD7495ARM-but mechanical layout and digital interface remain unchanged.
AD7495ARM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- 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 ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7495ARM FAQ
1.How can I place an order for AD7495ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495ARM 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 AD7495ARM reliable?
The price and inventory of AD7495ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495ARM is usually 5 days.
3.What payment methods are accepted for AD7495ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495ARM?
AD7495ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495ARM 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 AD7495ARM?
For technical support, including AD7495ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495ARM requirements.
6.How does Aetrix verify that AD7495ARM is sourced from the original manufacturer or authorized distributors?
All AD7495ARM 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 AD7495ARM meets industry standards.
7.What is the process for return or replacement of AD7495ARM?
All AD7495ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7495ARM, 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 AD7495ARM part is unused and in its original packaging.
Return procedure for AD7495ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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