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Analog Devices Inc. AD7475BRMZ
- Part No.:
- AD7475BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7475BRMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
AD7475BRMZ 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 68 dB SINAD at 300 kHz input, 4.5 mW max power at 3 V/1 MSPS, and external 2.5 V reference support - used in portable medical instruments for high-fidelity analog signal digitization.
For engineers reviewing the AD7475BRMZ datasheet, AD7475BRMZ pinout, AD7475BRMZ application, or AD7475BRMZ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The AD7475BRMZ implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its track-and-hold supports full-power bandwidth up to 8.3 MHz (–3 dB) and acquires full-scale steps in ≤325 ns.
It uses VDRIVE to decouple logic interface voltage (2.7 V–5.25 V) from VDD, enabling direct interfacing with 3 V or 5 V microprocessors without level shifters. Standby current is 1 µA max, and conversion timing is fully determined by SCLK frequency - not internal clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes over 0 V to REF IN range |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of signals up to ~400 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz - ensures ≥11.3 effective bits for precision sensor data acquisition |
| Power Dissipation | 4.5 mW max at 3 V/1 MSPS - supports battery operation >10 hours in 10 mA portable systems |
| Reference Input | 2.5 V ±1% required - mandates external low-drift reference (e.g., AD780) for specified DC accuracy |
| Aperture Jitter | 50 ps typ - limits SNR degradation to <0.1 dB at 300 kHz input frequency |
| Integral Nonlinearity | ±1 LSB max (B version) - guarantees monotonicity and no missing codes across full temperature range |
Pinout & Package
AD7475BRMZ is housed in an 8-lead MSOP package (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is marked via laser scribe or dot; pin numbering follows standard MSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Reference Input | Accepts external 2.5 V ±1% reference; requires ≥0.1 µF decoupling capacitor to GND for stability |
| 2 - VIN | Analog Input | Single-ended input with 0 V to REF IN range; 20 pF input capacitance demands careful driver selection |
| 3 - GND | Analog Ground | Primary ground reference for analog circuitry; must be connected to clean analog plane, separate from digital return |
| 4 - SCLK | Serial Clock Input | Drives both data transfer and internal conversion timing; supports 10 kHz–20 MHz; 5 ns rise/fall time specified |
| 5 - SDATA | Serial Data Output | 3-state output delivering 4 leading zeros + 12-bit MSB-first result on SCLK falling edge |
| 6 - VDRIVE | Digital I/O Supply | Sets logic levels for CS, SCLK, SDATA; independent of VDD - allows mixed-voltage system interfacing |
| 7 - CS | Chip Select (Active Low) | Initiates conversion on falling edge; frames serial data; minimum pulse width 100 ns between conversions |
| 8 - VDD | Analog/Digital Power Supply | Single 2.7 V–5.25 V supply powering core ADC, T/H, and control logic; 450 mW absolute max dissipation |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic latency: conversion starts on CS fall and completes in fixed 800 ns (at 20 MHz SCLK) |
| VDRIVE logic supply independence | Enables direct connection to 3 V FPGA or 5 V MCU without level translators - reduces BOM count and layout complexity |
| Three power modes | Full shutdown (1 µA), partial power-down (100 µA), and normal mode - allows dynamic power scaling per sample rate demand |
| Wide input bandwidth | 8.3 MHz full-power bandwidth (–3 dB) supports anti-aliasing filter design with relaxed roll-off requirements |
| SPI-/QSPI-/MICROWIRE-compatible | Interoperates with common DSP and microcontroller serial peripherals without protocol translation firmware |
Applications
| Portable ECG Monitor | Handheld Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency bio-potential signals (0.5–150 Hz) with minimal noise injection in battery-powered wearable units. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing conditioned ECG channel; samples at 1 MSPS to oversample and digitally filter motion artifacts. Use Value: 68 dB SINAD and 50 ps aperture jitter preserve diagnostic fidelity; 4.5 mW power enables >12-hour runtime on 3.7 V Li-ion cell. |
Use Scenario: Capturing intermediate frequency (IF) signals up to 300 kHz in compact RF test equipment requiring real-time FFT processing. IC Role / Device Role / Timing Role: High-speed front-end ADC feeding FPGA-based spectral analysis engine; synchronized via CS/SCLK for precise trigger alignment. Use Value: 8.3 MHz full-power bandwidth avoids signal attenuation before digitization; no pipeline delay ensures accurate time-of-arrival measurement. |
| Industrial Sensor Node | Optical Smoke Detector Signal Chain |
Use Scenario: Converting outputs from MEMS accelerometers and RTD temperature sensors in wireless condition-monitoring nodes deployed in harsh environments. IC Role / Device Role / Timing Role: Dual-role ADC handling both fast transient vibration events and slow thermal drift compensation - switched via power-down modes. Use Value: 1 µA full shutdown current extends node lifetime; ±1 LSB INL ensures calibrated accuracy across –40°C to +85°C industrial range. |
Use Scenario: Digitizing photodiode current pulses from scattered light detection chamber, where signal amplitude varies from nA to µA depending on smoke density. IC Role / Device Role / Timing Role: Precision ADC referenced to stable 2.5 V source (e.g., ADR4525), converting transimpedance amplifier output for smoke concentration calculation. Use Value: External REF IN allows traceable calibration; 20 pF input capacitance matches low-noise op-amp drive capability without peaking. |
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 |
|---|---|---|---|
| AD7476BRMZ | Same 12-bit SAR core but 1.25 MSPS max; 3.5 mW at 3 V/1 MSPS; identical pinout and REF IN requirement | Higher throughput margin for burst-mode sampling; same external reference dependency and thermal profile | Select when system requires headroom above 1 MSPS or lower static power in partial power-down mode |
| ADS7822U | 12-bit, 200 kSPS max; SPI-compatible; internal 2.5 V reference; 8-pin SOIC only; 2.7 V–5.25 V supply | Lower speed suited for slower sensor polling; eliminates external reference but sacrifices SINAD (64 dB vs. 68 dB) | Select for cost-sensitive, space-constrained designs where 200 kSPS suffices and reference integration simplifies layout |
Compared with AD7475BRMZ, AD7476BRMZ offers higher speed and slightly lower power at same throughput, while ADS7822U trades speed and AC performance for integrated reference and lower BOM count - choice depends on whether throughput headroom or reference simplicity dominates the design priority.
Availability
AD7475BRMZ is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, industrial sensor nodes, and optical safety devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for AD7475BRMZ 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 Wilmington, MA, with R&D centers worldwide.
The AD7475BRMZ belongs to Analog Devices' precision SAR ADC product line, engineered for battery-powered instrumentation demanding high AC performance, low power, and single-supply simplicity without sacrificing DC accuracy.
FAQ
What is the reference voltage requirement for AD7475BRMZ?
The AD7475BRMZ requires an external 2.5 V ±1% reference applied to the REF IN pin. This reference sets the full-scale analog input range (0 V to 2.5 V). A minimum 0.1 µF ceramic capacitor must be placed directly at the REF IN pin to GND for stability and noise rejection. The AD7475BRMZ does not include an internal reference - unlike the pin-compatible AD7495 - so reference selection critically impacts gain error and temperature drift.
Does AD7475BRMZ support SPI mode 0 or mode 3?
Yes, AD7475BRMZ supports SPI mode 0 (CPOL = 0, CPHA = 0) and mode 3 (CPOL = 1, CPHA = 1) because its SDATA output is valid on the falling edge of SCLK and is sampled on the same edge. The device is explicitly specified as SPI-/QSPI™-/MICROWIRE-/DSP-compatible, and timing diagrams confirm setup/hold relationships align with both modes. No configuration register is needed - interface behavior is hardwired.
Can AD7475BRMZ operate with VDD = 3.3 V and VDRIVE = 5 V?
Yes, AD7475BRMZ supports independent VDD and VDRIVE supplies within 2.7 V–5.25 V each. With VDD = 3.3 V and VDRIVE = 5 V, the analog core runs at 3.3 V (reducing power), while digital I/O interfaces directly to 5 V microcontrollers. Absolute maximum ratings permit VDRIVE − VDD ≤ 0.3 V, so this combination is safe and commonly used to simplify mixed-voltage system design without level shifters.
What is the minimum quiet time (tQUIET) between conversions for AD7475BRMZ?
The minimum quiet time tQUIET between consecutive conversions for AD7475BRMZ is 100 ns, as specified in Table 3 of the Rev. D datasheet. This interval must elapse after SDATA goes high-impedance (t8/t9) and before the next CS falling edge initiates a new conversion. Violating tQUIET risks metastability or invalid data; it is independent of SCLK frequency and must be enforced in firmware or hardware timing control.
Is AD7475BRMZ pin-compatible with AD7475ARMZ?
Yes, AD7475BRMZ and AD7475ARMZ share identical 8-lead MSOP packaging, pinout, and electrical specifications - differing only in grade (B = –40°C to +85°C, A = –40°C to +85°C with looser INL/THD limits). Both use REF IN, VIN, GND, SCLK, SDATA, VDRIVE, CS, and VDD in the same physical locations and functional roles. PCB layout and firmware are fully interchangeable between the two variants.
AD7475BRMZ 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:
- -
AD7475BRMZ FAQ
1.How can I place an order for AD7475BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475BRMZ 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 AD7475BRMZ reliable?
The price and inventory of AD7475BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475BRMZ is usually 5 days.
3.What payment methods are accepted for AD7475BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475BRMZ?
AD7475BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475BRMZ 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 AD7475BRMZ?
For technical support, including AD7475BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475BRMZ requirements.
6.How does Aetrix verify that AD7475BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7475BRMZ 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 AD7475BRMZ meets industry standards.
7.What is the process for return or replacement of AD7475BRMZ?
All AD7475BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7475BRMZ, 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 AD7475BRMZ part is unused and in its original packaging.
Return procedure for AD7475BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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