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Analog Devices Inc. AD7475BRZ
- Part No.:
- AD7475BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7475BRZ.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
AD7475BRZ 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, ±1 LSB integral nonlinearity (B grade), and 4.5 mW power consumption at 3 V/1 MSPS. It serves as a high-speed, low-power analog front-end for portable data acquisition in battery-powered instrumentation.
For engineers reviewing the AD7475BRZ datasheet, AD7475BRZ pinout, AD7475BRZ application, or AD7475BRZ equivalent, key selection criteria include external 2.5 V reference requirement, VDRIVE-independent 3 V/5 V logic interface, no pipeline delay, 800 ns conversion time, and SOIC/MSOP-8 package compatibility with space-constrained embedded systems.
Technical Context
The AD7475BRZ implements a capacitive DAC-based successive-approximation architecture with a track-and-hold amplifier supporting full-power bandwidth up to 8.3 MHz (–3 dB) and 1.3 MHz (–0.1 dB). Conversion is initiated on the falling edge of CS and synchronized to SCLK, requiring exactly 16 clock cycles at 20 MHz for 800 ns completion.
It uses straight binary output coding, supports SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interfaces, and provides three power modes: normal (1.5 mA at 3 V), partial power-down (100 µA static), and full shutdown (1 µA). The VDRIVE pin decouples logic-level voltage (2.7 V–5.25 V) from VDD, enabling direct interfacing with mixed-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes over full-scale analog input range |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth |
| SINAD | 68 dB min at 300 kHz - enables accurate digitization of medium-frequency sensor outputs with <0.4% RMS noise+distortion |
| Integral Nonlinearity | ±1 LSB max (B grade) - ensures monotonicity and guarantees no missing codes across full 12-bit range |
| Power Dissipation | 4.5 mW max at 3 V/1 MSPS - allows continuous high-speed operation in thermally constrained handheld devices |
| Conversion Time | 800 ns max - fixed latency determined by 16×SCLK cycles, enabling deterministic timing control |
| Reference Input | 2.5 V ±1% external - requires stable buffered source on REF IN pin; mandates ≥0.1 µF local decoupling |
Pinout & Package
AD7475BRZ is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), with pin 1 marked by notch or dot. Thermal impedance θJA = 157°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | External reference input | Accepts 2.5 V ±1% precision voltage; must be decoupled with ≥0.1 µF capacitor to GND for stable conversion accuracy |
| 2 - VIN | Analog input | Single-ended input referenced to GND; full-scale range = 0 V to REF IN voltage; 20 pF input capacitance |
| 3 - GND | Analog ground | Primary return path for analog circuitry; must connect to clean analog ground plane, separate from digital ground |
| 4 - SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports 10 kHz–20 MHz frequency range |
| 5 - SDATA | Serial data output | 3-state output delivering 12-bit result MSB-first preceded by four leading zeros; driven by VDRIVE voltage |
| 6 - VDRIVE | Logic interface supply | Sets I/O voltage level independently of VDD; allows direct connection to 3 V or 5 V processors without level shifters |
| 7 - CS | Chip select (active low) | Initiates sampling on falling edge; frames serial data transfer; controls power mode transitions |
| 8 - VDD | Analog/digital supply | Single 2.7 V–5.25 V supply powering core ADC, T/H, and logic; 750 µA static current draw |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True successive-approximation behavior with deterministic 800 ns conversion latency-enables precise time-critical sampling control via CS edge |
| VDRIVE voltage independence | Serial interface operates at VDRIVE level (2.7 V–5.25 V) regardless of VDD, eliminating need for external level translation in mixed-supply systems |
| Three-tier power management | Full shutdown (1 µA), partial power-down (100 µA), and dynamic scaling via SCLK rate allow average power optimization across variable throughput demands |
| Wide supply range | Functional operation from 2.7 V to 5.25 V enables direct integration into legacy 5 V and modern 3.3 V/3 V systems without regulators |
| High input bandwidth | 8.3 MHz full-power bandwidth (–3 dB) supports accurate digitization of fast transients and RF-sampled baseband signals |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG or pulse oximetry analog waveforms in handheld diagnostic tools powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing 12-bit samples at up to 1 MSPS with minimal power overhead and no timing uncertainty. Use Value: 4.5 mW consumption at 3 V extends battery life while 68 dB SINAD preserves clinical-grade signal fidelity for arrhythmia detection algorithms. |
Use Scenario: Field-deployed environmental monitoring nodes recording temperature, humidity, and gas concentration over weeks on primary batteries. IC Role / Device Role / Timing Role: Low-quiescent ADC enabling burst-mode acquisition-awakened by MCU, sampled once per minute, then returned to 1 µA shutdown. Use Value: Full power-down current of 1 µA minimizes standby drain; VDRIVE flexibility allows direct interface with ultra-low-voltage 1.8 V MCUs. |
| Industrial Handheld Testers | Optical Sensor Signal Conditioning |
Use Scenario: Portable multimeters and insulation testers requiring high-accuracy DC and AC measurements under varying ambient temperatures. IC Role / Device Role / Timing Role: Precision ADC front-end with ±1 LSB INL (B grade) and stable 2.5 V reference support for calibrated voltage/current readings. Use Value: External REF IN allows use of ultra-stable references (e.g., AD780) to maintain calibration integrity across –40°C to +85°C operating range. |
Use Scenario: Digitizing photodiode or pyroelectric sensor outputs in smoke detectors, spectrometers, and laser alignment systems. IC Role / Device Role / Timing Role: High-bandwidth ADC capturing fast optical pulses or modulated IR signals with 1.3 MHz full-scale bandwidth (–0.1 dB). Use Value: 300 ns track-and-hold acquisition time ensures faithful capture of nanosecond-scale optical events without aperture jitter degradation. |
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 |
|---|---|---|---|
| AD7476BRZ | Same 12-bit SAR architecture but rated for 1.25 MSPS; identical pinout, package, and reference scheme; higher max SCLK (25 MHz) | Requires faster controller clocking; offers margin for future throughput upgrades without layout change | Select AD7476BRZ when system design targets >1 MSPS headroom or plans migration to higher sample rates |
| ADS7822U | TI 12-bit SAR ADC; 200 kSPS max; uses internal 2.5 V reference; SPI-compatible but lacks VDRIVE pin; SO-8 package | Lower power (1.25 mW at 200 kSPS) but cannot match 1 MSPS throughput or flexible logic interfacing | Choose ADS7822U only for cost-sensitive, low-throughput applications where external reference elimination outweighs speed loss |
Compared with AD7475BRZ, AD7476BRZ provides verified throughput headroom within identical footprint and biasing, while ADS7822U trades speed and interface flexibility for lower cost and integrated reference-making AD7475BRZ optimal for balanced performance in portable 1 MSPS systems.
Availability
AD7475BRZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable test equipment, and industrial data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for AD7475BRZ 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 R&D and manufacturing spanning 15+ countries.
The AD7475BRZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for portable, low-power, high-fidelity data acquisition where deterministic latency, wide supply tolerance, and minimal external components are critical.
FAQ
What reference voltage does the AD7475BRZ require?
The AD7475BRZ requires an external 2.5 V ±1% reference applied to the REF IN pin. Unlike the AD7495, it does not include an internal reference. A minimum 0.1 µF ceramic capacitor must be placed between REF IN and GND to ensure stable conversion accuracy and low noise performance across the full 1 MSPS throughput range of the AD7475BRZ.
Does the AD7475BRZ support 3 V microcontroller interfaces?
Yes, the AD7475BRZ supports direct 3 V microcontroller interfacing via its VDRIVE pin. When VDRIVE is tied to a 3 V supply, all digital inputs (CS, SCLK) accept 3 V logic levels and the SDATA output swings between 0.4 V and VDRIVE − 0.2 V, enabling seamless SPI communication with 3 V MCUs without level-shifting circuitry-this capability is fully specified and validated for the AD7475BRZ.
What is the maximum sampling rate of the AD7475BRZ?
The AD7475BRZ achieves a maximum throughput rate of 1 MSPS, confirmed under conditions of VDD = 2.7 V to 5.25 V, fSCLK = 20 MHz, and TA = −40°C to +85°C. This rate is enabled by a fixed 16-cycle conversion time, resulting in 800 ns latency. Exceeding 20 MHz SCLK violates timing specifications and is not supported for reliable operation of the AD7475BRZ.
How does power management work on the AD7475BRZ?
The AD7475BRZ implements three distinct power states controlled via CS and SCLK: Normal Mode (1.5 mA at 3 V), Partial Power-Down (100 µA static), and Full Power-Down (1 µA). Entering Full Power-Down requires holding CS high and stopping SCLK; recovery takes 20 µs. This hierarchical control allows dynamic power scaling aligned precisely with acquisition duty cycles in the AD7475BRZ.
Is the AD7475BRZ pin-compatible with other devices in the AD7475/AD7495 family?
Yes, the AD7475BRZ shares identical 8-lead SOIC/MSOP pinout and footprint with AD7475ARZ, AD7475ARMZ, AD7495BRZ, and AD7495ARMZ. However, pin functions differ at Pin 1: AD7475 variants use REF IN, while AD7495 variants use REF OUT. Swapping them without circuit revision will cause functional failure-this mechanical compatibility does not imply electrical or functional interchangeability for the AD7475BRZ.
AD7475BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7475BRZ FAQ
1.How can I place an order for AD7475BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475BRZ 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 AD7475BRZ reliable?
The price and inventory of AD7475BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475BRZ is usually 5 days.
3.What payment methods are accepted for AD7475BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475BRZ?
AD7475BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475BRZ 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 AD7475BRZ?
For technical support, including AD7475BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475BRZ requirements.
6.How does Aetrix verify that AD7475BRZ is sourced from the original manufacturer or authorized distributors?
All AD7475BRZ 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 AD7475BRZ meets industry standards.
7.What is the process for return or replacement of AD7475BRZ?
All AD7475BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7475BRZ, 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 AD7475BRZ part is unused and in its original packaging.
Return procedure for AD7475BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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