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Analog Devices Inc. AD7495BR
- Part No.:
- AD7495BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7495BR.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,188
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Product details
Overview
AD7495BR 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), SPI-compatible serial interface, and 68 dB SINAD at 300 kHz input - used in portable medical instruments and battery-powered data acquisition systems.
For engineers reviewing the AD7495BR datasheet, AD7495BR pinout, AD7495BR application, or AD7495BR equivalent, this page delivers verified specifications, package mapping, real-world use scenarios, and validated alternative options for low-power, high-speed analog-to-digital conversion in space-constrained embedded designs.
Technical Context
The AD7495BR implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, sampling triggered by CS falling edge and conversion clocked by SCLK. Its on-chip 2.5 V reference (±1% initial accuracy, 50 ppm/°C drift) sets the full-scale analog input range to 0 V to 2.5 V.
VDRIVE enables independent logic-level interfacing (2.7 V–5.25 V), decoupling serial I/O voltage from VDD. Power management includes three modes: normal (6 mW @ 3 V), partial power-down (690 µW), and full shutdown (3 µW), all controlled via CS timing without external signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precision measurement of analog sensor or signal sources. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients up to 300 kHz while maintaining 68 dB SINAD. |
| Reference | On-chip 2.5 V ±1% - eliminates external reference component count and layout area; REF OUT provides buffered output with 10 Ω impedance. |
| Power Dissipation | 6 mW max @ 3 V, 1 MSPS - enables continuous high-speed conversion in thermally constrained battery-operated devices. |
| SNR/SINAD | 68 dB min @ fIN = 300 kHz - ensures accurate digitization of medium-bandwidth signals such as ECG waveforms or optical sensor outputs. |
| Integral Nonlinearity | ±1 LSB max @ 5 V - guarantees monotonicity and ≤1 LSB error across full temperature range (−40°C to +85°C). |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.01% of 1 MSPS period, preserving dynamic performance at high input frequencies. |
Pinout & Package
AD7495BR 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 instrumentation and wireless sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF OUT) | On-chip reference output | Provides 2.5 V ±1% reference; requires ≥100 nF bypass capacitor to GND; must be buffered before routing to other ICs. |
| 2 (VIN) | Analog input | Single-ended input with 0 V to 2.5 V range; 20 pF input capacitance and ±1 µA leakage enable direct connection to low-output-impedance sensors. |
| 3 (GND) | Analog ground | Primary reference for analog circuitry; must be connected to clean analog ground plane - separate from digital ground except at single point. |
| 4 (SCLK) | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports 10 kHz–20 MHz; 40/60 mark/space ratio required. |
| 5 (SDATA) | Serial data output | MSB-first 12-bit result preceded by four leading zeros; tri-state enabled by CS; compatible with SPI/QSPI/MICROWIRE protocols. |
| 6 (VDRIVE) | Digital I/O supply | Sets logic levels for SDATA, SCLK, CS independently of VDD - allows direct interfacing to 3 V or 5 V microcontrollers without level shifters. |
| 7 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data; controls power modes via pulse width timing. |
| 8 (VDD) | Analog/digital core supply | 2.7 V–5.25 V single supply powers ADC core, track-and-hold, and reference; 450 mW absolute max power dissipation rating. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation behavior with deterministic 800 ns conversion time - enables precise timing-critical sampling synchronized to external events. |
| VDRIVE logic independence | Serial interface operates at 2.7 V–5.25 V regardless of VDD - simplifies mixed-voltage system design and eliminates level-shifter components. |
| Three-tier power management | Full shutdown (1 µA), partial power-down (230 µA), and operational modes allow dynamic power scaling based on real-time throughput requirements. |
| On-chip 2.5 V reference | 50 ppm/°C tempco and 2.4625 V–2.5375 V output tolerance ensure stable full-scale calibration across industrial temperature range without external trimming. |
| Wide input bandwidth | 1.3 MHz full-power bandwidth (0.1 dB) supports accurate digitization of fast-rising pulses and broadband sensor outputs without external anti-alias filtering. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Digitizing ECG or pulse oximetry analog front-end outputs in handheld diagnostic devices with strict size and battery life constraints. IC Role / Device Role / Timing Role: Primary ADC capturing biopotential signals at ≥1 kSPS with <1 LSB INL to preserve clinical waveform fidelity. Use Value: Integrated 2.5 V reference and 6 mW power at 1 MSPS eliminate external reference and reduce total BOM cost by one precision component. |
Use Scenario: Sampling multi-channel sensor arrays (temperature, humidity, pressure) in field-deployable environmental monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: High-speed, low-quiescent ADC enabling burst-mode acquisition to minimize active time and extend battery life. Use Value: Full power-down mode draws only 1 µA, allowing microcontroller to wake the AD7495BR on demand and achieve >1-year battery runtime. |
| Optical Sensor Interface | Industrial Control Loop Feedback |
Use Scenario: Converting photodiode or CCD output currents in compact optical analyzers where board space limits passive component count. IC Role / Device Role / Timing Role: Signal-chain ADC with 68 dB SINAD at 300 kHz supporting high-fidelity digitization of modulated light signals. Use Value: 20 pF input capacitance and ±1 µA leakage minimize loading on transimpedance amplifier outputs, preserving bandwidth and SNR. |
Use Scenario: Sampling analog feedback signals (e.g., motor current, position encoder outputs) in servo drives requiring deterministic latency and monotonic response. IC Role / Device Role / Timing Role: Deterministic 800 ns conversion with no pipeline delay ensures predictable control loop timing and jitter-free sampling. Use Value: CS-triggered sampling and SPI-compatible interface simplify integration with real-time DSPs and microcontrollers in closed-loop systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 1 MSPS SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7475BR | No on-chip reference; requires external 2.5 V REF IN; lower power (4.5 mW @ 3 V) and tighter INL (±0.5 LSB typ). | Suitable where reference is shared across multiple converters or higher accuracy is prioritized over integration. | Select when system already includes a precision reference and lowest possible power at 1 MSPS is critical. |
| ADS7822U | 2.7 V–5.25 V supply; 1 MSPS; no internal reference; SPI interface; 11.5-bit ENOB; 1.25 mW @ 3 V. | Lower resolution and dynamic performance (64 dB SINAD); optimized for ultra-low-power sub-MSPS operation. | Choose for cost-sensitive, lower-performance applications where 12-bit linearity and 68 dB SINAD are not required. |
Compared with AD7475BR and ADS7822U, the AD7495BR uniquely combines integrated reference, guaranteed 12-bit monotonicity, and 68 dB SINAD at 1 MSPS - making it optimal for space-limited, high-fidelity portable measurement systems where reference integration reduces design risk and bill-of-materials complexity.
Availability
AD7495BR is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, optical sensor interfaces, and industrial control loop feedback requiring stable component supply and long-term production continuity.
Supply support for AD7495BR 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 AD7495BR belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed digitization in portable and energy-constrained systems where accuracy, integration, and small footprint are essential.
FAQ
What is the reference voltage specification for the AD7495BR?
The AD7495BR features an on-chip 2.5 V reference with output tolerance of 2.4625 V to 2.5375 V (±1.5% total error including initial accuracy and tempco), 50 ppm/°C temperature coefficient, and 10 Ω output impedance. A minimum 100 nF capacitor must be placed between REF OUT and GND. This reference directly defines the 0 V to 2.5 V analog input range of the AD7495BR.
Does the AD7495BR require an external reference?
No, the AD7495BR does not require an external reference because it integrates a trimmed 2.5 V reference. Unlike the AD7475BR, which uses the REF IN pin for an external reference, the AD7495BR uses pin 1 as REF OUT and derives its conversion scale internally. The AD7495BR's REF OUT can be buffered and reused elsewhere in the system, but must not be loaded beyond its specified drive capability.
What are the power consumption values for the AD7495BR at different operating modes?
The AD7495BR consumes 6 mW maximum at 3 V and 1 MSPS in normal operational mode, 690 µW in partial power-down mode (100 kSPS), and 3 µW in full power-down mode. Static current is 2 mA max at 3 V in normal mode and drops to 1 µA in full shutdown. These values are measured per the AD7495 specifications table and confirmed in the Power vs. Throughput Rate section of the datasheet.
Is the AD7495BR pin-compatible with the AD7475BR?
No, the AD7495BR and AD7475BR are not pin-compatible: AD7475BR uses pin 1 as REF IN (input), while AD7495BR uses pin 1 as REF OUT (output). Although both share identical 8-lead MSOP/SOIC footprints and identical pin assignments for VIN, GND, SCLK, SDATA, VDRIVE, CS, and VDD, the function swap on pin 1 requires PCB layout revision when substituting between them.
What serial interface protocols does the AD7495BR support?
The AD7495BR supports SPI-, QSPI™-, MICROWIRE-, and DSP-compatible serial interfaces. It outputs 16-bit frames comprising four leading zeros followed by 12 bits of conversion data (MSB first) on the falling edge of SCLK. The CS signal controls framing and conversion initiation, and the VDRIVE pin allows logic-level compatibility with 3 V or 5 V host processors independent of VDD voltage.
AD7495BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7495BR FAQ
1.How can I place an order for AD7495BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7495BR 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 AD7495BR reliable?
The price and inventory of AD7495BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7495BR is usually 5 days.
3.What payment methods are accepted for AD7495BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7495BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7495BR?
AD7495BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7495BR 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 AD7495BR?
For technical support, including AD7495BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7495BR requirements.
6.How does Aetrix verify that AD7495BR is sourced from the original manufacturer or authorized distributors?
All AD7495BR 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 AD7495BR meets industry standards.
7.What is the process for return or replacement of AD7495BR?
All AD7495BR units undergo pre-shipment inspection (PSI). If there is an issue with AD7495BR, 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 AD7495BR part is unused and in its original packaging.
Return procedure for AD7495BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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