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Analog Devices Inc. AD7495BRM-REEL
- Part No.:
- AD7495BRM-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7495BRM-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,049
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Product details
Overview
AD7495BRM-REEL 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-compatible serial interface. It serves as a high-speed analog front-end in portable instrumentation requiring precision DC-coupled sampling.
For engineers reviewing the AD7495BRM-REEL datasheet, AD7495BRM-REEL pinout, AD7495BRM-REEL application, or AD7495BRM-REEL equivalent, key selection criteria include guaranteed no-missed-codes performance, VDRIVE-independent logic interface, full-power bandwidth of 8.3 MHz, 1 µA standby current, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The AD7495BRM-REEL implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, enabling precise control of sampling instant via CS falling edge. Conversion timing is fully determined by SCLK frequency-16 cycles required at up to 20 MHz-with acquisition time as low as 300 ns for sine-wave inputs.
Its integrated 2.5 V reference (±1% initial accuracy, 50 ppm/°C drift) drives REF OUT with 10 Ω typical output impedance and requires ≥100 nF decoupling. The VDRIVE pin enables independent logic-level interfacing (2.7 V–5.25 V), allowing direct connection to 3 V or 5 V microprocessors regardless of VDD supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes with straight binary coding |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz - ensures ≥11.0 effective number of bits (ENOB) for medium-bandwidth sensor signals |
| Reference | On-chip 2.5 V ±1% - eliminates external reference component and layout area; REF OUT pin provides buffered access |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - enables battery-powered operation with <2 mA supply current |
| Standby Current | 1 µA max - reduces system quiescent power during idle intervals without reset overhead |
| Full Power Bandwidth | 8.3 MHz @ −3 dB - supports accurate digitization of fast transients and wideband optical sensor outputs |
Pinout & Package
AD7495BRM-REEL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for compact PCB layouts in portable and medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF OUT) | On-chip reference output | Provides 2.4625 V to 2.5375 V buffered 2.5 V reference; requires ≥100 nF capacitor to GND for stability |
| 2 (VIN) | Analog input | Single-ended input with 0 V to 2.5 V range referenced to REF OUT; 20 pF input capacitance |
| 3 (GND) | Analog ground | Primary ground reference for internal circuitry and external analog signal return path |
| 4 (SCLK) | Serial clock input | Controls conversion timing and data clocking; accepts 10 kHz–20 MHz; determines 800 ns max conversion time |
| 5 (SDATA) | Serial data output | MSB-first 12-bit result preceded by four leading zeros; tri-state controlled by CS; compatible with SPI/QSPI/MICROWIRE |
| 6 (VDRIVE) | Digital I/O supply | Sets logic threshold levels independently 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 transfer |
| 8 (VDD) | Analog/digital power supply | Single 2.7 V–5.25 V supply powering core ADC, reference, and logic; 450 mW absolute max power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation behavior with deterministic sampling instant tied to CS falling edge-enables synchronized multi-channel acquisition |
| VDRIVE logic independence | Serial interface operates at user-defined voltage (2.7 V–5.25 V), decoupled from VDD-eliminates level shifters in mixed-supply systems |
| Guaranteed no-missed-codes | Differential nonlinearity ≤ +1.5/−0.9 LSB across full temperature range-ensures monotonic response critical for closed-loop control |
| Flexible power management | Three operating modes (normal, partial power-down, full power-down) with 1 µA shutdown current-supports duty-cycled sensing architectures |
| Wide input bandwidth | 8.3 MHz full-power bandwidth at −3 dB-preserves fidelity of fast-rising pulses from photodiode amplifiers and piezoelectric sensors |
Applications
| Portable Medical Sensors | Optical Pulse Oximetry |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency plethysmographic waveforms from photodiode front-ends in wearable pulse oximeters. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing 12-bit samples at 1 MSPS with precise aperture timing and minimal jitter. Use Value: 68 dB SINAD and 50 ps aperture jitter preserve signal integrity for SpO₂ calculation algorithms; on-chip 2.5 V reference reduces BOM count and layout sensitivity. |
Use Scenario: Sampling dual-wavelength (660 nm / 940 nm) photodiode currents in compact clinical-grade oximeters. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC with 8.3 MHz full-power bandwidth to resolve rapid IR/Red LED modulation edges. Use Value: No pipeline delay enables tight synchronization with LED drive timing; 1 µA standby current extends battery life between measurement cycles. |
| Industrial Handheld Testers | Battery-Powered Data Loggers |
Use Scenario: Capturing transient voltage/current waveforms during field diagnostics of motor drives and power supplies. IC Role / Device Role / Timing Role: Standalone precision ADC interfaced directly to ARM Cortex-M microcontrollers via SPI. Use Value: VDRIVE pin allows direct 3.3 V MCU connection while VDD runs at 5 V for optimal SNR; MSOP-8 footprint saves board space in ruggedized enclosures. |
Use Scenario: Long-duration environmental monitoring using low-power microcontrollers and analog sensor arrays (temperature, humidity, gas). IC Role / Device Role / Timing Role: Low-quiescent-power ADC activated only during scheduled sampling bursts. Use Value: Full power-down mode draws just 1 µA, reducing average system current; on-chip reference avoids drift-prone external components over temperature. |
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 |
|---|---|---|---|
| AD7475BRM-REEL | No on-chip reference; requires external 2.5 V REF IN; lower power (4.5 mW @ 3 V) | Better suited for systems where reference is shared across multiple ICs or precision external references are already present | Select when reference sharing, ultra-low power (<1.5 mA), or cost-sensitive BOM optimization is prioritized |
| ADS8320EB/250 | 16-bit resolution, 100 kSPS max, SPI interface, no internal reference, 3 V–5.5 V supply | Targeted at higher-precision, lower-speed applications like precision weight scales or calibration equipment | Choose when ENOB > 14 bits is required and throughput ≤100 kSPS suffices; not drop-in compatible due to resolution, speed, and pinout differences |
Compared with AD7475BRM-REEL and ADS8320EB/250, the AD7495BRM-REEL uniquely balances 12-bit precision, 1 MSPS speed, and integrated reference in an MSOP-8 package-making it optimal for space-constrained, battery-operated systems needing self-contained analog digitization without external reference design effort.
Availability
AD7495BRM-REEL is available at Aetrix Electronics and suitable for portable medical instruments, optical sensor interfaces, and industrial handheld testers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7495BRM-REEL 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 since 1965.
The AD7495BRM-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed data acquisition in portable and distributed sensing systems where size, power, and integration are critical.
FAQ
What is the reference voltage source for AD7495BRM-REEL?
The AD7495BRM-REEL integrates a trimmed 2.5 V bandgap reference with ±1% initial accuracy and 50 ppm/°C temperature coefficient. This reference appears on the REF OUT pin (Pin 1) and must be decoupled with ≥100 nF to GND. Unlike the AD7475, the AD7495BRM-REEL does not require an external reference, simplifying design and improving system-level accuracy stability.
Does AD7495BRM-REEL support true 1 MSPS continuous sampling?
Yes, the AD7495BRM-REEL achieves a guaranteed 1 MSPS throughput rate when operated with a 20 MHz SCLK and proper timing margins. Its 800 ns max conversion time (16 SCLK cycles) and 300 ns max track-and-hold acquisition time enable sustained 1 µs cycle time, confirmed in Timing Example 1 of the datasheet. No pipeline delay ensures deterministic sample timing.
Can AD7495BRM-REEL interface directly with a 3.3 V microcontroller while powered from 5 V?
Yes. The VDRIVE pin (Pin 6) sets logic thresholds independently of VDD. When VDRIVE = 3.3 V and VDD = 5 V, the AD7495BRM-REEL accepts 3.3 V logic levels on CS, SCLK, and drives SDATA at 3.3 V-compatible levels-eliminating level shifters. This dual-supply flexibility is explicitly supported in the datasheet's Logic Inputs and Outputs sections.
What is the guaranteed missing-code performance of AD7495BRM-REEL?
The AD7495BRM-REEL guarantees no missing codes across its full 12-bit range under all operating conditions (−40°C to +85°C, 2.7 V–5.25 V). This is ensured by differential nonlinearity (DNL) of +1.5/−0.9 LSB max, which maintains monotonicity-a critical requirement for control loop feedback and waveform reconstruction applications.
How does the power-down mode operate in AD7495BRM-REEL?
The AD7495BRM-REEL offers three power states: Normal Mode (2.6 mA max at 5 V), Partial Power-Down (230 µA max), 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 battery-powered systems without losing configuration state.
AD7495BRM-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7495BRM-REEL FAQ
1.How can I place an order for AD7495BRM-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495BRM-REEL 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 AD7495BRM-REEL reliable?
The price and inventory of AD7495BRM-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495BRM-REEL is usually 5 days.
3.What payment methods are accepted for AD7495BRM-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495BRM-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495BRM-REEL?
AD7495BRM-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495BRM-REEL 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 AD7495BRM-REEL?
For technical support, including AD7495BRM-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495BRM-REEL requirements.
6.How does Aetrix verify that AD7495BRM-REEL is sourced from the original manufacturer or authorized distributors?
All AD7495BRM-REEL 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 AD7495BRM-REEL meets industry standards.
7.What is the process for return or replacement of AD7495BRM-REEL?
All AD7495BRM-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7495BRM-REEL, 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 AD7495BRM-REEL part is unused and in its original packaging.
Return procedure for AD7495BRM-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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