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Analog Devices Inc. AD7475BRM
- Part No.:
- AD7475BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7475BRM.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,388
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Product details
Overview
AD7475BRM from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC operating from a single 2.7 V to 5.25 V supply, featuring external 2.5 V reference input (REF IN), no pipeline delay, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It delivers 68 dB SINAD at 300 kHz input frequency and consumes only 4.5 mW at 3 V/1 MSPS - ideal for portable instrumentation requiring high-speed, low-power signal digitization.
For engineers reviewing the AD7475BRM datasheet, AD7475BRM pinout, AD7475BRM application, or AD7475BRM equivalent, key selection considerations include its 8-lead MSOP package, VDRIVE logic-level independence, 1 µA full shutdown current, track-and-hold acquisition time of 300 ns (sine wave), and guaranteed no-missed-codes performance with ±1 LSB DNL (B version).
Technical Context
The AD7475BRM implements a capacitive DAC-based successive-approximation architecture with precise sampling controlled by the CS falling edge and conversion clocked entirely by SCLK - eliminating pipeline latency. Its on-chip track-and-hold supports full-power bandwidth up to 8.3 MHz (–3 dB) and handles input frequencies above 1 MHz.
It uses VDRIVE to decouple logic interface voltage (2.7 V to 5.25 V) from analog supply (VDD), enabling direct interfacing with 3 V or 5 V processors without level shifters. Power management includes three modes: normal (1.5 mA at 3 V/1 MSPS), partial power-down (100 µA static), and full power-down (1 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precision measurement applications. |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of fast transients in data acquisition systems. |
| SINAD | 68 dB min at 300 kHz - ensures ≥11.3 effective bits for high-fidelity signal capture in noisy environments. |
| Power Dissipation | 4.5 mW max at 3 V/1 MSPS - supports battery operation in handheld medical or sensor devices for >100 hours. |
| Integral Nonlinearity | ±1 LSB max (B version) - guarantees monotonicity and accurate end-point linearity across temperature. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.1 LSB error at 100 kHz input, critical for dynamic accuracy. |
| Shutdown Current | 1 µA max - enables ultra-low quiescent power during idle periods in duty-cycled systems. |
Pinout & Package
AD7475BRM is housed in an 8-lead MSOP package (3.0 mm × 4.9 mm, 0.65 mm pitch), thermally optimized with θJA = 205.9°C/W and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | External reference input | Accepts 2.5 V ±1% reference; requires ≥0.1 µF decoupling capacitor for stable 12-bit conversion accuracy. |
| 2 - VIN | Analog input | Single-ended input with 0 V to REF IN range; 20 pF input capacitance necessitates careful driver impedance matching. |
| 3 - GND | Analog ground | Primary reference for analog circuitry; must be connected to clean analog ground plane to minimize noise coupling. |
| 4 - SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 20 MHz for 1 MSPS throughput. |
| 5 - SDATA | Serial data output | Provides 12-bit result MSB-first with four leading zeros; tri-state capable for bus sharing in multi-device systems. |
| 6 - VDRIVE | Digital I/O supply | Sets logic voltage level independently of VDD - allows direct connection to 3 V or 5 V microcontrollers without level shifters. |
| 7 - CS | Chip select (active low) | Initiates conversion on falling edge and frames serial data; enables precise timing control of sample instant. |
| 8 - VDD | Analog power supply | Supplies core ADC and track-and-hold; operates from 2.7 V to 5.25 V with 750 µA static current draw. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Sampling instant precisely defined by CS falling edge - eliminates timing uncertainty in closed-loop control systems. |
| VDRIVE logic independence | Serial interface operates at 2.7 V–5.25 V regardless of VDD - simplifies mixed-voltage system integration and reduces BOM count. |
| Guaranteed no-missed-codes | ±1.5/−0.9 LSB DNL (max) ensures monotonic transfer function - essential for position sensing and servo feedback. |
| Flexible power management | Three power modes (normal/partial/full shutdown) reduce average power by >99% during idle - extends battery life in portable instruments. |
| Wide input bandwidth | 8.3 MHz full-power bandwidth (–3 dB) supports accurate digitization of fast pulses and RF envelope signals. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Real-time acquisition of ECG or pulse oximetry analog waveforms in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 12-bit digitizer capturing biopotential signals at ≥1 kSPS with minimal power draw between measurements. Use Value: 1 µA shutdown current and 4.5 mW active power enable >72-hour battery life while maintaining 68 dB SINAD fidelity. |
Use Scenario: Multi-channel voltage monitoring in remote environmental sensor nodes powered by solar/battery hybrid sources. IC Role / Device Role / Timing Role: High-speed, low-drift ADC interfacing with precision op-amp front-ends for thermocouple or RTD conditioning. Use Value: External 2.5 V reference support and ±1 LSB INL ensure calibrated accuracy across –40°C to +85°C industrial temperature range. |
| Optical Sensor Interfaces | Mobile Communication Test Equipment |
|
Use Scenario: Digitizing photodiode current outputs in optical smoke detectors or fiber-optic link monitors. IC Role / Device Role / Timing Role: Fast-settling track-and-hold ADC acquiring transient light pulses with 300 ns acquisition time. Use Value: 8.3 MHz full-power bandwidth captures rapid optical events without aliasing, while VDRIVE enables direct FPGA interface. |
Use Scenario: Baseband signal sampling in portable RF field strength analyzers or cellular protocol testers. IC Role / Device Role / Timing Role: Low-jitter (50 ps) ADC capturing modulated IF signals for spectral analysis and demodulation. Use Value: 68 dB SINAD at 300 kHz and SPI-compatible interface allow real-time FFT processing on embedded ARM Cortex-M cores. |
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 |
|---|---|---|---|
| AD7476BRM | Same 12-bit SAR architecture but 1.25 MSPS max; lower power (3.3 mW @ 3 V); no VDRIVE pin - logic tied to VDD. | Lacks independent logic supply; requires VDD = VIO, limiting mixed-voltage designs. | Select when higher speed is needed and system uses single-rail logic; avoid if interfacing 3 V MCU with 5 V analog rail. |
| ADS7822U | 12-bit, 250 kSPS, 2.7–5.25 V supply; SPI interface; no VDRIVE; internal reference option; higher INL (±2 LSB). | Lower throughput and less precise DC specs; simpler biasing but no logic-level flexibility. | Choose for cost-sensitive, lower-speed applications where VDRIVE independence is unnecessary and board space is constrained. |
Compared with AD7475BRM, AD7476BRM offers faster conversion but sacrifices VDRIVE flexibility, while ADS7822U trades speed and accuracy for simplicity and lower cost - making AD7475BRM optimal for mixed-supply, battery-powered systems demanding 1 MSPS with guaranteed monotonicity.
Availability
AD7475BRM is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for AD7475BRM 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning over 50 years.
The AD7475BRM belongs to Analog Devices' precision SAR ADC product line, engineered for portable and power-constrained applications where speed, accuracy, and ultra-low power must coexist - such as handheld test equipment and clinical diagnostics.
FAQ
What is the reference configuration for AD7475BRM?
The AD7475BRM requires an external 2.5 V reference applied to the REF IN pin, with ±1% tolerance for specified performance. A minimum 0.1 µF ceramic capacitor must be placed directly at the REF IN pin to stabilize the reference and maintain 12-bit accuracy. Unlike the AD7495, the AD7475BRM does not include an internal reference.
Does AD7475BRM support SPI mode 0 or mode 3?
Yes, AD7475BRM supports SPI mode 0 (CPOL = 0, CPHA = 0) and mode 3 (CPOL = 1, CPHA = 1) via its SCLK and CS timing. Data is sampled on the falling edge of SCLK, and the SDATA output is valid after the falling edge - compatible with QSPI™, MICROWIRE, and DSP serial interfaces as confirmed in the AD7475BRM datasheet Rev. D.
What is the maximum SCLK frequency for AD7475BRM at 1 MSPS throughput?
The AD7475BRM requires a minimum SCLK frequency of 10 kHz and supports up to 20 MHz. At 1 MSPS throughput, a 20 MHz SCLK yields a conversion time of 800 ns (16 cycles), satisfying timing requirements. The device's tCONVERT is specified as 800 ns max at 20 MHz, and timing examples in the AD7475BRM datasheet confirm reliable operation at this rate.
Can AD7475BRM operate with VDD = 3.3 V and VDRIVE = 1.8 V?
No - AD7475BRM specifies VDRIVE = 2.7 V to 5.25 V per the Absolute Maximum Ratings and Electrical Specifications tables. Applying 1.8 V to VDRIVE violates the minimum VDRIVE rating and may cause unreliable logic communication or damage. VDRIVE must match the host processor's I/O voltage within the 2.7–5.25 V range.
Is AD7475BRM pin-compatible with AD7475ARMZ?
Yes - AD7475BRM (8-lead MSOP) and AD7475ARMZ (8-lead MSOP) share identical pinout, footprint, and electrical specifications. Both are B-grade versions with −40°C to +85°C temperature range and ±1 LSB INL (max). The suffix difference denotes tape-and-reel packaging (BRM) versus cut-tape (ARMZ), not functional variation.
AD7475BRM 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:
- -
AD7475BRM FAQ
1.How can I place an order for AD7475BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475BRM 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 AD7475BRM reliable?
The price and inventory of AD7475BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475BRM is usually 5 days.
3.What payment methods are accepted for AD7475BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475BRM?
AD7475BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475BRM 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 AD7475BRM?
For technical support, including AD7475BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475BRM requirements.
6.How does Aetrix verify that AD7475BRM is sourced from the original manufacturer or authorized distributors?
All AD7475BRM 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 AD7475BRM meets industry standards.
7.What is the process for return or replacement of AD7475BRM?
All AD7475BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD7475BRM, 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 AD7475BRM part is unused and in its original packaging.
Return procedure for AD7475BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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