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Analog Devices Inc. AD7495BRMZ
- Part No.:
- AD7495BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7495BRMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
AD7495BRMZ 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-compatible serial interface - used for high-fidelity data acquisition in portable medical instruments and battery-powered sensor nodes.
For engineers reviewing the AD7495BRMZ datasheet, AD7495BRMZ pinout, AD7495BRMZ application, or AD7495BRMZ equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use-value per application, and two confirmed alternative parts with documented functional and architectural differences.
Technical Context
The AD7495BRMZ implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, sampling triggered by CS falling edge and conversion clocked entirely by SCLK. Its track-and-hold supports full-scale step acquisition in ≤325 ns and handles input frequencies up to 8.3 MHz (–3 dB).
It integrates a buffered 2.5 V reference (±1% initial accuracy, 50 ppm/°C drift) outputting from REF OUT, eliminating external reference components. The VDRIVE pin enables independent logic-level interfacing (2.7 V–5.25 V) decoupled from VDD, supporting direct connection to 3 V or 5 V microcontrollers without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes over 0 V to 2.5 V input range (LSB = 610 µV) |
| Throughput Rate | 1 MSPS maximum - supports real-time sampling of signals up to ~300 kHz while maintaining ≥68 dB SINAD |
| SINAD | 68 dB min at fIN = 300 kHz - ensures <0.4% RMS distortion for precision waveform capture in instrumentation |
| Reference | On-chip 2.5 V ±1% buffered reference (REF OUT) - removes need for external reference IC and decoupling network |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - enables continuous high-speed acquisition in energy-constrained systems like handheld diagnostics |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.03 LSB at 300 kHz, preserving dynamic performance |
| Integral Nonlinearity | ±1 LSB max (B version) - guarantees monotonicity and <0.025% full-scale linearity error across temperature |
Pinout & Package
AD7495BRMZ is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is marked by dot; pin numbering follows standard MSOP top-view convention.
| 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 ceramic capacitor to GND for stability |
| 2 (VIN) | Analog input | Single-ended input referenced to GND; accepts 0 V to 2.5 V range; 20 pF input capacitance demands careful driver selection |
| 3 (GND) | Analog ground | Primary ground reference for analog circuitry; must be connected to low-impedance analog ground plane, separate from digital return |
| 4 (SCLK) | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports 10 kHz–20 MHz; 40/60 duty cycle required |
| 5 (SDATA) | Serial data output | 3-state output delivering 12-bit result MSB-first preceded by four leading zeros; driven low/high relative to VDRIVE |
| 6 (VDRIVE) | Digital I/O supply | Sets logic voltage levels for SDATA, SCLK, CS; can differ from VDD (e.g., VDD = 5 V, VDRIVE = 3.3 V) enabling mixed-voltage interfacing |
| 7 (CS) | Chip select (active low) | Initiates conversion on falling edge; frames serial data transfer; must remain low for entire 16-SCLK conversion cycle |
| 8 (VDD) | Analog/digital power supply | Single 2.7 V–5.25 V supply powering core ADC, reference, and logic; 450 mW max power dissipation rating |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation operation enables deterministic, single-shot conversion control via CS - critical for time-triggered embedded systems |
| VDRIVE voltage independence | Allows serial interface to operate at 3 V while VDD runs at 5 V, eliminating level translators when interfacing with modern low-voltage MCUs |
| Three power-down modes | Full shutdown draws only 1 µA; partial power-down reduces current to 230 µA at 100 kSPS - extends battery life in intermittent-sampling applications |
| On-chip 2.5 V reference | Integrated buffered reference with 50 ppm/°C drift and 10 Ω output impedance eliminates external reference cost, board space, and calibration complexity |
| SPI/QSPI/MICROWIRE/DSP compatibility | Standard 4-wire serial interface with CS/SCLK/SDATA supports plug-and-play integration with ARM Cortex-M, TI C2000, and ADI SHARC DSPs |
Applications
| Portable ECG Monitor | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Continuous 1 kHz sampling of amplified biopotential signals from dry-electrode chest leads in a handheld diagnostic device. IC Role / Device Role / Timing Role: Primary analog front-end digitizer; samples conditioned analog voltage with precise timing controlled by MCU's CS and SCLK. Use Value: 68 dB SINAD at 300 kHz and 1 µA shutdown current enable >24-hour battery life while preserving clinical-grade signal fidelity for arrhythmia detection. |
Use Scenario: High-accuracy reading of RTD or thermistor bridges in a DIN-rail mounted PLC I/O module operating at 85°C ambient. IC Role / Device Role / Timing Role: Precision DC-coupled ADC capturing slow-varying resistance-derived voltages; operates in normal mode during polling cycles. Use Value: ±1 LSB INL and on-chip 2.5 V reference eliminate system-level calibration drift, reducing field maintenance intervals by 40% versus external-reference solutions. |
| Optical Smoke Detector Signal Chain | Wireless Vibration Sensor Edge Node |
Use Scenario: Digitizing pulsed IR photodiode current outputs in battery-powered smoke alarms complying with UL 217. IC Role / Device Role / Timing Role: Low-power ADC acquiring peak amplitude and pulse width of scattered light bursts; activated on interrupt-driven wake-up. Use Value: 325 ns track-and-hold acquisition time captures fast transients; 6 mW active power at 3 V allows >5-year coin-cell operation with periodic sampling. |
Use Scenario: Capturing broadband accelerometer waveforms (DC–2 kHz) in predictive maintenance sensors deployed on rotating machinery. IC Role / Device Role / Timing Role: High-SNR digitizer feeding FFT engine in ultra-low-power MCU; synchronized to external trigger for event-based capture. Use Value: 8.3 MHz full-power bandwidth and 50 ps aperture jitter preserve spectral integrity for bearing fault frequency analysis up to 10 kHz. |
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 |
|---|---|---|---|
| ADS7822UID | 12-bit, 200 kSPS, external reference only, no on-chip buffer, 3.3 V–5.25 V supply | Lacks integrated reference and 1 MSPS throughput; suited for lower-speed, cost-sensitive industrial controls | Select when reference flexibility and lower BOM cost outweigh speed and integration needs |
| MAX11100ETE+ | 12-bit, 1 MSPS, internal 4.096 V reference, SPI interface, 2.7 V–3.6 V supply only | Fixed 4.096 V reference increases LSB size (1 mV); incompatible with 5 V systems; higher gain error (±12 LSB) | Choose for 3.3 V-only designs requiring larger input range and accepting reduced DC accuracy |
Compared with ADS7822UID and MAX11100ETE+, the AD7495BRMZ uniquely combines 1 MSPS speed, on-chip 2.5 V reference with buffering, wide 2.7 V–5.25 V supply range, and sub-1 µA shutdown - making it optimal for portable, mixed-voltage, high-SNR applications where board space and calibration overhead are constrained.
Availability
AD7495BRMZ is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensors requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AD7495BRMZ 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 AD7495BRMZ belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-SNR data acquisition in portable and embedded systems where accuracy, integration, and energy efficiency are co-optimized.
FAQ
What is the reference voltage configuration of the AD7495BRMZ?
The AD7495BRMZ features an integrated, buffered 2.5 V reference accessible at the REF OUT pin. This reference is factory-trimmed to ±1% initial accuracy with 50 ppm/°C temperature coefficient and requires a minimum 100 nF ceramic capacitor to GND for stability. Unlike the AD7475, the AD7495BRMZ does not accept an external reference - REF IN is not present on this variant.
Does the AD7495BRMZ support true 1 MSPS continuous conversion?
Yes, the AD7495BRMZ achieves 1 MSPS sustained throughput when operated with a 20 MHz SCLK and proper timing margins. Conversion time is fixed at 800 ns (16 SCLK cycles), and the minimum quiet time between conversions is 100 ns. At 20 MHz SCLK, the total cycle time is 1 µs, fully supporting 1 MSPS operation without pipeline latency or dead time.
Can the AD7495BRMZ interface directly with a 1.8 V microcontroller?
No - the AD7495BRMZ logic interface requires VDRIVE between 2.7 V and 5.25 V. Its input high threshold is VDRIVE − 1 V, and output high level is VDRIVE − 0.2 V. A 1.8 V MCU cannot meet the VINH minimum; a level-shifting circuit or I/O voltage translator is required for interoperability.
What is the purpose of the VDRIVE pin on the AD7495BRMZ?
The VDRIVE pin sets the logic voltage level for all digital I/Os (SCLK, CS, SDATA). It may be supplied independently from VDD - for example, VDD = 5 V for analog performance while VDRIVE = 3.3 V to match a 3.3 V processor. This eliminates external level shifters and simplifies mixed-voltage system design, a key advantage over legacy ADCs with fixed I/O voltage tied to VDD.
How does the AD7495BRMZ minimize power consumption during idle periods?
The AD7495BRMZ offers three power-down modes: partial (230 µA static), full (1 µA), and automatic sleep after conversion. Full shutdown is entered by holding CS high for >100 ns after conversion completes. Power-up time from full shutdown is 650 µs - fast enough for burst-mode sensing while cutting quiescent draw by 99.9% versus normal operation.
AD7495BRMZ 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:
- 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7495BRMZ FAQ
1.How can I place an order for AD7495BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495BRMZ 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 AD7495BRMZ reliable?
The price and inventory of AD7495BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495BRMZ is usually 5 days.
3.What payment methods are accepted for AD7495BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495BRMZ?
AD7495BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495BRMZ 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 AD7495BRMZ?
For technical support, including AD7495BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495BRMZ requirements.
6.How does Aetrix verify that AD7495BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7495BRMZ 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 AD7495BRMZ meets industry standards.
7.What is the process for return or replacement of AD7495BRMZ?
All AD7495BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7495BRMZ, 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 AD7495BRMZ part is unused and in its original packaging.
Return procedure for AD7495BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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