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Analog Devices Inc. AD7495ARZ-REEL7
- Part No.:
- AD7495ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7495ARZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
AD7495ARZ-REEL7 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), SPI-compatible serial interface, and 68 dB SINAD at 300 kHz input. It serves as a high-speed data acquisition front-end in portable instrumentation requiring low power and precise analog digitization.
For engineers reviewing the AD7495ARZ-REEL7 datasheet, AD7495ARZ-REEL7 pinout, AD7495ARZ-REEL7 application, or AD7495ARZ-REEL7 equivalent, key selection criteria include its integrated 2.5 V reference output (REF OUT), VDRIVE logic-level independence, no-pipeline-delay conversion control via CS, and guaranteed no-missed-codes performance across −40°C to +85°C.
Technical Context
The AD7495ARZ-REEL7 implements a capacitive DAC-based successive-approximation architecture with track-and-hold acquisition time ≤325 ns for full-scale steps. Its conversion is initiated on the falling edge of CS and clocked by SCLK, requiring exactly 16 cycles at up to 20 MHz - enabling deterministic timing without pipeline latency.
It features dual power domains: VDD powers the analog core and SAR logic (2.7 V–5.25 V), while VDRIVE independently sets digital I/O voltage (2.7 V–5.25 V), allowing direct interfacing to 3 V or 5 V microcontrollers without level shifters. The on-chip 2.5 V reference (±1% initial accuracy, 50 ppm/°C TC) is buffered and available at REF OUT with 10 Ω output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with straight binary coding and guaranteed no-missed-codes performance. |
| Throughput Rate | 1 MSPS maximum - supports real-time sampling of signals up to ~1.3 MHz (0.1 dB flatness) in high-speed data loggers. |
| SINAD | 68 dB min at 300 kHz input - enables accurate digitization of medium-bandwidth sensor signals (e.g., accelerometers, optical detectors). |
| Reference | On-chip 2.5 V ±1% (REF OUT) - eliminates external reference component count and reduces BOM cost and board area. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - suitable for battery-powered systems with strict average current budgets (e.g., <2 mA typical supply current). |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.1 LSB error at 300 kHz, preserving dynamic range in precision acquisition. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and medical environments without derating. |
Pinout & Package
AD7495ARZ-REEL7 is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012). 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 2.4625 V to 2.5375 V (2.5 V ±1.5%) buffered reference; requires ≥100 nF decoupling to GND; must be buffered before use as system reference. |
| 2 (VIN) | Analog input | Single-ended input with 0 V to 2.5 V range referenced to GND; 20 pF input capacitance necessitates careful driver impedance matching. |
| 3 (GND) | Analog ground | Primary ground reference for analog circuitry; must connect directly to low-impedance analog ground plane to minimize noise coupling. |
| 4 (SCLK) | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports 10 kHz–20 MHz; defines conversion time as 16 × tSCLK. |
| 5 (SDATA) | Serial data output | 3-state output delivering 12-bit result MSB-first preceded by four leading zeros; data valid on SCLK falling edge. |
| 6 (VDRIVE) | Digital I/O supply | Sets logic threshold for all digital pins (CS, SCLK, SDATA); independent of VDD - enables mixed-voltage interfacing (e.g., 3 V MCU with 5 V VDD). |
| 7 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data; controls device enable and timing synchronization. |
| 8 (VDD) | Analog/digital core supply | Powers SAR, track-and-hold, and reference circuitry; 2.7 V–5.25 V range allows flexibility across legacy and modern supply rails. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion completes in fixed 800 ns (at 20 MHz SCLK) with sampling precisely controlled by CS edge - essential for time-critical closed-loop systems. |
| VDRIVE logic independence | Separate VDRIVE pin allows serial interface to operate at 3 V while VDD runs at 5 V - eliminates level translators in mixed-voltage designs. |
| Integrated 2.5 V reference | On-chip buffered reference (REF OUT) with 50 ppm/°C TC and 10 Ω output impedance - reduces external component count and improves system reproducibility. |
| Three power modes | Normal (2 mA @ 3 V), partial power-down (650 µA), and full shutdown (1 µA) - enables adaptive power management in duty-cycled sensing applications. |
| SPI/QSPI/MICROWIRE compatibility | Standard 4-wire serial interface with CS, SCLK, SDATA - ensures drop-in integration with common microcontrollers (e.g., STM32, TMS320C5x, ADSP-21xx). |
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 front-end ADC digitizing conditioned biopotential signals at 1–2 kSPS in burst mode, leveraging standby current of 1 µA between samples. Use Value: Integrated 2.5 V reference and 6 mW active power at 3 V eliminate external reference and reduce total solution size - critical for compact wearable form factors. |
Use Scenario: Multi-channel voltage monitoring in factory-floor PLC modules acquiring sensor outputs (RTDs, strain gauges) with 12-bit resolution and >65 dB SNR. IC Role / Device Role / Timing Role: High-fidelity digitizer interfacing to isolated analog front-ends, using CS-triggered sampling synchronized to programmable scan intervals. Use Value: Guaranteed no-missed-codes performance and 68 dB SINAD at 300 kHz ensure accurate representation of transducer signals even under electromagnetic interference. |
| Optical Sensor Interfaces | Mobile Communication Test Equipment |
|
Use Scenario: Digitizing photodiode or CCD output in portable spectrometers or laser alignment tools where low noise and wide input bandwidth are required. IC Role / Device Role / Timing Role: Wide-bandwidth track-and-hold amplifier (8.3 MHz full-power bandwidth @ 3 dB) captures fast optical pulses without distortion. Use Value: 50 ps aperture jitter and 68 dB SINAD preserve signal integrity for FFT-based spectral analysis - enabling sub-nm wavelength resolution. |
Use Scenario: Embedded signal analysis in handheld RF field strength meters or base station maintenance tools requiring real-time waveform capture. IC Role / Device Role / Timing Role: High-speed acquisition engine capturing IF or baseband signals up to 300 kHz with deterministic CS-controlled sampling. Use Value: SPI-compatible interface and 1 MSPS throughput allow seamless integration with ARM Cortex-M7 MCUs running real-time FFT firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, serial-interface ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7475ARZ-REEL7 | Lacks on-chip reference; requires external 2.5 V REF IN; lower power (4.5 mW @ 3 V) but needs reference BOM addition. | Suitable when system already provides a high-accuracy external reference and board space is constrained for passive components. | Select AD7475ARZ-REEL7 only if reference sharing across multiple ADCs justifies added complexity and layout overhead. |
| ADS7822U | 12-bit, 200 kSPS, single-supply (2.7–3.6 V), no internal reference, SPI interface, higher THD (−65 dB) and lower SINAD (65 dB). | Better suited for cost-sensitive, lower-speed applications like basic sensor readout where 1 MSPS is unnecessary. | Choose ADS7822U only for sub-200 kSPS applications where power budget is tighter than performance requirements. |
Compared with AD7475ARZ-REEL7, the AD7495ARZ-REEL7 trades slightly higher active power (6 mW vs. 4.5 mW) for significant system-level simplification via integrated reference; versus ADS7822U, it delivers 5× higher throughput and 3 dB better SINAD at the cost of wider supply range and higher pin count.
Availability
AD7495ARZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, industrial data loggers, and optical sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7495ARZ-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, with design and manufacturing expertise spanning over 50 years.
The AD7495ARZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-throughput data acquisition in space-constrained, battery-operated, and industrial-grade applications.
FAQ
What is the reference voltage source for AD7495ARZ-REEL7?
The AD7495ARZ-REEL7 integrates a trimmed 2.5 V bandgap reference with ±1% initial accuracy and 50 ppm/°C temperature coefficient. This reference is available at the REF OUT pin (Pin 1) and requires a minimum 100 nF capacitor to GND. Unlike the AD7475, the AD7495ARZ-REEL7 does not accept an external reference - REF IN is not present on this variant.
Does AD7495ARZ-REEL7 support true 1 MSPS continuous conversion?
Yes, AD7495ARZ-REEL7 achieves 1 MSPS throughput with a 20 MHz SCLK and proper timing margins. Conversion time is fixed at 800 ns (16 SCLK cycles), and the minimum quiet time (tQUIET) between conversions is 100 ns. With CS reasserted every 1 µs, sustained 1 MSPS operation is fully specified and tested across −40°C to +85°C.
Can AD7495ARZ-REEL7 interface directly with a 3.3 V microcontroller while operating from a 5 V VDD supply?
Yes. AD7495ARZ-REEL7 uses separate VDD (analog core, 2.7–5.25 V) and VDRIVE (digital I/O, 2.7–5.25 V) supplies. Connect VDRIVE to the microcontroller's 3.3 V rail and VDD to 5 V. All digital pins (CS, SCLK, SDATA) then operate at 3.3 V logic levels - no level shifter is needed.
What is the guaranteed DC accuracy of AD7495ARZ-REEL7 over temperature?
AD7495ARZ-REEL7 guarantees ±1 LSB integral nonlinearity (INL) and +1.5/−0.9 LSB differential nonlinearity (DNL) over −40°C to +85°C at 5 V supply. Offset error is ±8 LSB max, gain error is ±7 LSB max. These specs ensure monotonicity and no-missed-codes behavior across the full industrial temperature range.
How does the power-down mode function in AD7495ARZ-REEL7?
AD7495ARZ-REEL7 offers three power states: Normal (2 mA @ 3 V), Partial Power-Down (230 µA static), and Full Power-Down (1 µA). Full shutdown is entered by holding CS high for >100 ns after conversion completes; wake-up time is 650 µs. This enables aggressive power gating in intermittent-sampling applications like wireless sensor nodes.
AD7495ARZ-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:
- Active
- 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:
- -
AD7495ARZ-REEL7 FAQ
1.How can I place an order for AD7495ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495ARZ-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 AD7495ARZ-REEL7 reliable?
The price and inventory of AD7495ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7495ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495ARZ-REEL7?
AD7495ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495ARZ-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 AD7495ARZ-REEL7?
For technical support, including AD7495ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495ARZ-REEL7 requirements.
6.How does Aetrix verify that AD7495ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7495ARZ-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 AD7495ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7495ARZ-REEL7?
All AD7495ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7495ARZ-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 AD7495ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7495ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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