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Analog Devices Inc. AD7495BRM
- Part No.:
- AD7495BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7495BRM.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,762
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Product details
Overview
AD7495BRM 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 digitizer in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the AD7495BRM datasheet, AD7495BRM pinout, AD7495BRM application, or AD7495BRM equivalent, key selection considerations include its integrated 2.5 V reference output (REF OUT), VDRIVE logic-level independence, 1 µA full power-down current, 8-lead MSOP package, and absence of pipeline delay for deterministic sampling control.
Technical Context
The AD7495BRM 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 by SCLK - no internal pipeline stages ensure precise sampling timing control.
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 microprocessors without level shifters. The on-chip 2.5 V reference provides ±1% initial accuracy and 50 ppm/°C tempco, buffered at REF OUT with 10 Ω typical output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precision measurement applications. |
| Throughput Rate | 1 MSPS max - supports real-time sampling of signals up to ~300 kHz with ≥68 dB SINAD. |
| SINAD | 68 dB min at fIN = 300 kHz - enables accurate digitization of medium-bandwidth sensor signals. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - suitable for thermally constrained, battery-operated designs. |
| Reference | On-chip 2.5 V ±1% (REF OUT) - eliminates external reference component and layout area. |
| Power-Down Current | 1 µA max - reduces standby power in intermittent-sampling systems like wireless sensors. |
| Input Bandwidth | 8.3 MHz @ −3 dB - accommodates fast transients and anti-aliasing filter design flexibility. |
Pinout & Package
AD7495BRM is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts. 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 buffered 2.5 V reference; requires ≥100 nF decoupling to GND. |
| 2 (VIN) | Analog input | Single-ended input with 0 V to 2.5 V range; 20 pF input capacitance affects anti-aliasing filter design. |
| 3 (GND) | Analog ground | Primary ground reference for analog circuitry; must be connected to low-impedance analog plane. |
| 4 (SCLK) | Serial clock input | Drives both data transfer and internal conversion timing; supports up to 20 MHz clock rate. |
| 5 (SDATA) | Serial data output | MSB-first 12-bit result preceded by four leading zeros; tri-state controlled by CS. |
| 6 (VDRIVE) | Digital I/O supply | Sets logic thresholds independently of VDD - enables mixed-voltage system interfacing. |
| 7 (CS) | Chip select (active low) | Initiates conversion on falling edge; frames serial data transfer and controls SDATA three-state. |
| 8 (VDD) | Analog/digital core supply | Single 2.7 V–5.25 V supply powers ADC core, track-and-hold, and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Sampling instant precisely controlled by CS falling edge - eliminates latency uncertainty in closed-loop systems. |
| VDRIVE logic independence | Serial interface operates at 2.7 V–5.25 V regardless of VDD - avoids level shifters when interfacing with 3 V or 5 V processors. |
| On-chip 2.5 V reference | REF OUT provides stable, buffered reference with 50 ppm/°C drift - reduces BOM count and improves system-level accuracy. |
| Flexible power management | Three operating modes (normal, partial power-down, full power-down) allow dynamic power scaling based on throughput demand. |
| Wide supply range | 2.7 V–5.25 V operation supports both Li-ion battery (3.0–4.2 V) and regulated 5 V rails without redesign. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG or pulse oximetry signals in handheld diagnostic devices. IC Role / Device Role / Timing Role: High-fidelity analog front-end digitizer with deterministic sampling timing and low power consumption. Use Value: 68 dB SINAD preserves signal integrity for clinical-grade waveform analysis; 1 µA shutdown current extends battery life between measurements. |
Use Scenario: Periodic environmental monitoring (temperature, humidity, light) in remote IoT nodes. IC Role / Device Role / Timing Role: Low-power, self-contained ADC with integrated reference for simplified sensor interface. Use Value: On-chip 2.5 V REF OUT eliminates external reference IC and associated decoupling, reducing board area and component count. |
| Optical Sensor Interfaces | Industrial Field Transmitters |
Use Scenario: Digitizing photodiode or ambient light sensor outputs in compact optical modules. IC Role / Device Role / Timing Role: Fast 1 MSPS sampling front-end with wide 8.3 MHz input bandwidth for transient light detection. Use Value: 325 ns track-and-hold acquisition time ensures accurate capture of rapid light pulses without external sample-hold circuitry. |
Use Scenario: Signal conditioning and digitization in 4–20 mA loop-powered field instruments. IC Role / Device Role / Timing Role: Precision ADC with robust 2.7 V–5.25 V supply tolerance and low thermal drift reference. Use Value: 50 ppm/°C REF OUT tempco maintains measurement stability across industrial temperature ranges (−40°C to +85°C). |
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 | Lacks on-chip reference; requires external 2.5 V REF IN; lower power (4.5 mW at 3 V/1 MSPS) vs. AD7495BRM's 6 mW. | Suitable where board space allows external reference and lowest possible active power is critical. | Select AD7475BRM only if external reference is already present and power budget is tighter than reference integration benefit. |
| ADS7822U | 12-bit, 250 kSPS max, no internal reference, 3 V–5.5 V supply, SPI interface, 8-pin SOIC package. | Lower throughput limits use in slower-sampling applications like basic sensor monitoring. | Choose ADS7822U when 1 MSPS is unnecessary and cost-sensitive, low-complexity designs dominate. |
Compared with AD7475BRM and ADS7822U, the AD7495BRM uniquely combines 1 MSPS speed, integrated 2.5 V reference, and VDRIVE flexibility - making it optimal for space- and power-constrained systems requiring self-contained, high-fidelity digitization without external support components.
Availability
AD7495BRM is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, optical sensors, and industrial field transmitters requiring stable component supply and long-term production continuity.
Supply support for AD7495BRM 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 AD7495BRM belongs to the AD7475/AD7495 family of micropower, single-supply SAR ADCs designed specifically for portable, battery-operated, and space-constrained measurement systems demanding high speed and low power.
FAQ
What is the reference voltage source for AD7495BRM?
The AD7495BRM integrates a precision 2.5 V bandgap reference, accessible at the REF OUT pin (Pin 1). This output provides 2.4625 V to 2.5375 V with 50 ppm/°C temperature coefficient and requires ≥100 nF ceramic decoupling to GND. Unlike the AD7475BRM, the AD7495BRM does not accept an external reference - REF IN is not present on this variant.
Does AD7495BRM support SPI-compatible serial communication?
Yes, the AD7495BRM features a SPI-/QSPI™-/MICROWIRE-/DSP-compatible serial interface. It uses CS (active-low chip select), SCLK (serial clock), and SDATA (serial data out) pins. Data is output MSB-first as a 12-bit word preceded by four leading zeros, synchronized to the falling edge of SCLK, with timing fully compliant to standard SPI Mode 0 and Mode 3 protocols.
What is the maximum sampling rate and corresponding power consumption of AD7495BRM?
The AD7495BRM achieves a maximum throughput rate of 1 MSPS. At this rate, power dissipation is 6 mW max with a 3 V supply and 13 mW max with a 5 V supply. Power scales with throughput: in partial power-down mode at 100 kSPS, consumption drops to 690 µW (3 V) or 1.15 mW (5 V), and full power-down draws just 1 µA.
How does the VDRIVE pin function on AD7495BRM?
The VDRIVE pin on AD7495BRM sets the logic threshold voltages for all digital inputs (CS, SCLK) and output (SDATA), independent of VDD. It accepts 2.7 V to 5.25 V, allowing direct connection to 3 V or 5 V microcontrollers without level-shifting circuitry. For example, AD7495BRM can operate from a 5 V VDD while interfacing to a 3 V processor via VDRIVE = 3 V.
What package type and dimensions does AD7495BRM use?
The AD7495BRM is supplied in an 8-lead MSOP package (RM suffix), measuring 3.0 mm × 3.0 mm with 0.65 mm lead pitch. This compact, surface-mount outline provides thermal impedance of 205.9°C/W (θJA) and is RoHS-compliant. Pin configuration matches the AD7475BRM except that Pin 1 is REF OUT instead of REF IN.
AD7495BRM 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:
- -
AD7495BRM FAQ
1.How can I place an order for AD7495BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495BRM 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 reliable?
The price and inventory of AD7495BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495BRM is usually 5 days.
3.What payment methods are accepted for AD7495BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495BRM?
AD7495BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495BRM 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?
For technical support, including AD7495BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495BRM requirements.
6.How does Aetrix verify that AD7495BRM is sourced from the original manufacturer or authorized distributors?
All AD7495BRM 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 meets industry standards.
7.What is the process for return or replacement of AD7495BRM?
All AD7495BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD7495BRM, 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 part is unused and in its original packaging.
Return procedure for AD7495BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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