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Analog Devices Inc. AD7495AR-REEL7
- Part No.:
- AD7495AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7495AR-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,077
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Product details
Overview
AD7495AR-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC with integrated 2.5 V reference, single-supply operation (2.7 V to 5.25 V), 68 dB SINAD at 300 kHz input, and SPI-compatible serial interface. It serves as a high-speed analog front-end in portable instrumentation requiring precision, low power, and compact layout.
For engineers reviewing the AD7495AR-REEL7 datasheet, AD7495AR-REEL7 pinout, AD7495AR-REEL7 application, or AD7495AR-REEL7 equivalent, key selection criteria include on-chip reference accuracy (±1.5% over temperature), no pipeline delay, 1 µA full shutdown current, and VDRIVE-independent logic interfacing for mixed-voltage systems.
Technical Context
The AD7495AR-REEL7 implements a capacitive DAC-based successive-approximation architecture with track-and-hold acquisition time ≤325 ns for full-scale steps and aperture jitter of 50 ps typ. Its conversion is initiated by CS falling edge and clocked entirely by SCLK - no internal oscillator or pipeline stages are used.
It features dual supply domains: VDD powers analog and core logic (2.7–5.25 V), while VDRIVE sets I/O voltage level (2.7–5.25 V) independently, enabling direct interfacing to 3 V or 5 V microcontrollers without level shifters. The on-board 2.5 V reference (REF OUT) delivers 10 Ω output impedance and 50 ppm/°C tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz input - enables ≥11.3 effective bits for medium-bandwidth sensor signals |
| Reference | On-chip 2.5 V ±1.5% - eliminates external reference component and associated PCB area/cost |
| Power @ 1 MSPS | 6 mW max at 3 V - allows battery operation in handheld medical or field instruments |
| Shutdown Current | 1 µA max - reduces system standby power in duty-cycled data loggers |
| Aperture Jitter | 50 ps typ - limits SNR degradation at high input frequencies (e.g., >100 kHz) |
Pinout & Package
AD7495AR-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCBs in portable electronics. Pin functions are validated per Analog Devices Rev. D datasheet Figures 6 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF OUT | On-chip reference output | Provides buffered 2.5 V reference; requires ≥100 nF decoupling to GND; not intended as system reference without external buffer |
| 2 - VIN | Analog input | Single-ended input referenced to GND; full-scale range = 0 V to REF OUT (0–2.5 V) |
| 3 - GND | Analog ground | Primary return path for analog circuitry; must be connected to clean analog ground plane |
| 4 - SCLK | Serial clock input | Drives both data transfer and internal conversion timing; supports up to 20 MHz; determines throughput rate |
| 5 - SDATA | Serial data output | 3-state output delivering 12-bit result MSB-first, preceded by four zeros; active only during CS low |
| 6 - VDRIVE | I/O power supply | Sets logic threshold for all digital pins; enables interoperability with 3 V or 5 V host processors independent of VDD |
| 7 - CS | Chip select (active low) | Initiates conversion on falling edge; frames serial data transaction; controls output enable of SDATA |
| 8 - VDD | Analog/digital core supply | Powers internal ADC, reference, and logic; operates from 2.7 V to 5.25 V; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation operation ensures deterministic, single-cycle latency - critical for closed-loop control timing |
| VDRIVE logic independence | Allows direct connection to 3 V FPGA or 5 V DSP without level-shifting components or signal integrity risk |
| Integrated 2.5 V reference | Eliminates need for external reference IC and its supporting passives, reducing BOM count and layout complexity |
| Flexible power management | Three operating modes (normal/partial/full power-down) let designers trade throughput vs. average power in burst-sampling applications |
| SPI/QSPI/MICROWIRE compatibility | Enables drop-in integration with widely deployed microcontroller peripheral libraries without custom driver development |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG or pulse oximetry signals in handheld diagnostic devices powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing biopotential waveforms at ≥1 kSPS with <1 µA quiescent current during sleep intervals. Use Value: On-chip 2.5 V reference and 1 µA shutdown current extend battery life beyond 12 months in intermittent-readout mode. |
Use Scenario: Multi-channel environmental monitoring (temperature, humidity, pressure) in remote industrial sites with solar/battery hybrid power. IC Role / Device Role / Timing Role: High-fidelity front-end ADC for sensor signal conditioning, synchronized via microcontroller SPI bus. Use Value: 68 dB SINAD at 300 kHz supports accurate digitization of fast transient events (e.g., valve actuation spikes) without aliasing. |
| Optical Sensor Interfaces | Mobile Communication Test Equipment |
Use Scenario: Digitizing photodiode or CCD output in compact optical analyzers (e.g., spectrophotometers, particle counters). IC Role / Device Role / Timing Role: Low-noise, wide-input-bandwidth ADC capturing fast light-pulse responses with minimal aperture jitter. Use Value: 50 ps aperture jitter preserves SNR when sampling narrow optical pulses, enabling sub-0.5% intensity measurement repeatability. |
Use Scenario: Signal integrity validation in RF front-end test fixtures where baseband I/Q signals require precise amplitude tracking. IC Role / Device Role / Timing Role: High-throughput ADC in automated test equipment capturing modulated baseband waveforms at 1 MSPS. Use Value: 1 MSPS throughput with no pipeline delay allows real-time envelope detection and distortion analysis without buffering latency. |
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 |
|---|---|---|---|
| AD7475AR-REEL7 | External 2.5 V reference required; lower power (4.5 mW @ 3 V); no REF OUT pin | Used where system already provides high-accuracy reference; preferred for ultra-low-power designs with external ref stability | Select when reference sharing across multiple ADCs or tighter gain error spec (<±3 LSB) is needed |
| ADS7822U | 2.7 V–5.25 V supply; 1 MSPS; no internal reference; 8-pin SOIC; THD −72 dB (vs. −75 dB) | Common in legacy TI-based industrial PLC modules; requires external reference and has higher THD | Choose when existing design uses TI ecosystem or needs pin-compatible upgrade path with minimal layout change |
Compared with AD7495AR-REEL7, AD7475AR-REEL7 saves 1.5 mW at 3 V but adds BOM cost and layout area for external reference; ADS7822U offers TI support continuity but trades 3 dB SINAD and lacks integrated reference - making AD7495AR-REEL7 optimal for new designs prioritizing integration and SNR.
Availability
AD7495AR-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, optical sensors, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7495AR-REEL7 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 AD7495 belongs to Analog Devices' precision SAR ADC product line, engineered for portable and power-sensitive applications demanding high DC accuracy, low noise, and minimal board space - especially where integrated reference and flexible I/O voltage simplify system design.
FAQ
What is the reference voltage source for AD7495AR-REEL7?
The AD7495AR-REEL7 integrates a trimmed 2.5 V bandgap reference, accessible at the REF OUT pin. This reference is specified at 2.4625 V to 2.5375 V (±1.5%) over temperature and requires ≥100 nF ceramic decoupling to GND. It is not intended to drive loads >100 µA without external buffering, and its 50 ppm/°C tempco supports stable performance across −40°C to +85°C.
Does AD7495AR-REEL7 support true 1 MSPS continuous conversion?
Yes, AD7495AR-REEL7 achieves 1 MSPS sustained throughput when driven by a 20 MHz SCLK and operated within its specified supply (2.7–5.25 V) and temperature (−40°C to +85°C) ranges. Conversion time is fixed at 800 ns (16 SCLK cycles), and the device exhibits no pipeline delay - each CS-initiated conversion yields one valid 12-bit result with deterministic timing.
Can AD7495AR-REEL7 interface directly with a 3.3 V microcontroller while powered from 5 V?
Yes. AD7495AR-REEL7 uses separate VDD (analog/core supply) and VDRIVE (I/O supply) pins. With VDD = 5 V and VDRIVE = 3.3 V, all digital inputs (CS, SCLK) accept 3.3 V logic levels, and SDATA outputs are 3.3 V compatible - eliminating level shifters. This dual-supply flexibility is confirmed in the Rev. D datasheet Absolute Maximum Ratings and Logic Input/Output sections.
What is the maximum recommended analog input frequency for AD7495AR-REEL7?
The AD7495AR-REEL7 specifies full-power bandwidth of 8.3 MHz (−3 dB) and 1.3 MHz (−0.1 dB). For optimal 12-bit accuracy, input signals should remain below 300 kHz, where dynamic specifications (68 dB SINAD, −75 dB THD) are guaranteed. Higher-frequency inputs suffer increased harmonic distortion and reduced effective resolution due to track-and-hold limitations and aperture jitter.
How does power consumption scale with throughput in AD7495AR-REEL7?
AD7495AR-REEL7 power scales nearly linearly with throughput in normal mode: 6 mW max at 1 MSPS/3 V, dropping to ~690 µW in partial power-down at 100 kSPS. Full power-down draws just 1 µA (3 µW at 3 V). This scalability is enabled by clock-gated internal blocks - unlike sigma-delta ADCs, no oversampling or digital filtering overhead exists, making it ideal for burst-mode sensing.
AD7495AR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7495AR-REEL7 FAQ
1.How can I place an order for AD7495AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495AR-REEL7 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 AD7495AR-REEL7 reliable?
The price and inventory of AD7495AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495AR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7495AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495AR-REEL7?
AD7495AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495AR-REEL7 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 AD7495AR-REEL7?
For technical support, including AD7495AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495AR-REEL7 requirements.
6.How does Aetrix verify that AD7495AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7495AR-REEL7 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 AD7495AR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7495AR-REEL7?
All AD7495AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7495AR-REEL7, 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 AD7495AR-REEL7 part is unused and in its original packaging.
Return procedure for AD7495AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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