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Analog Devices Inc. AD7475ARM
- Part No.:
- AD7475ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7475ARM.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
AD7475ARM 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. It serves as a high-speed, low-power analog front-end in portable instrumentation and battery-powered data acquisition.
For engineers reviewing the AD7475ARM datasheet, AD7475ARM pinout, AD7475ARM application, or AD7475ARM equivalent, this page delivers verified electrical specs, real-world timing behavior, package-specific interface constraints, and validated alternative options for embedded signal chain design.
Technical Context
The AD7475ARM 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-level compatibility from VDD - enabling direct interfacing with 3 V or 5 V microprocessors regardless of analog supply voltage. Power management includes three modes: normal (1.5–2.1 mA), partial power-down (100–450 µA), and full shutdown (1 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over 0 V to REF IN range |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~300 kHz with 68 dB SINAD |
| SINAD | 68 dB min at fIN = 300 kHz - defines usable dynamic range for medium-bandwidth sensor signals |
| Power Dissipation | 4.5 mW max at 3 V/1 MSPS - enables operation in thermally constrained handheld devices |
| Reference Input | External 2.5 V ±1% - requires stable buffered source; no internal reference |
| Conversion Time | 800 ns max - fixed 16-cycle latency at 20 MHz SCLK, no variable overhead |
| Supply Range | VDD = 2.7 V to 5.25 V - compatible with Li-ion, 3.3 V, and 5 V system rails |
Pinout & Package
AD7475ARM is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance (θJA = 205.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF IN (Pin 1) | Reference Input | Accepts external 2.5 V ±1% reference; requires ≥0.1 µF decoupling capacitor to GND |
| VIN (Pin 2) | Analog Input | Single-ended input with 0 V to REF IN range; 20 pF input capacitance affects anti-alias filter design |
| GND (Pin 3) | Analog Ground | Primary ground reference for analog circuitry; must be tied to clean analog plane, not digital return |
| SCLK (Pin 4) | Serial Clock Input | Drives both data transfer and internal conversion timing; supports 10 kHz–20 MHz frequency range |
| SDATA (Pin 5) | Serial Data Output | 3-state output delivering 4 leading zeros + 12-bit MSB-first result on SCLK falling edge |
| VDRIVE (Pin 6) | Digital I/O Supply | Sets logic thresholds independently of VDD; allows 3 V MCU interface even when VDD = 5 V |
| CS (Pin 7) | Chip Select | Active-low signal initiating sample acquisition on falling edge and framing serial data window |
| VDD (Pin 8) | Analog Power Supply | Supplies core ADC and T/H amplifier; must be decoupled locally with ≥1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guaranteed deterministic 16-cycle conversion latency - simplifies timing-critical control loops |
| VDRIVE logic independence | Enables mixed-voltage systems: 3 V processor ↔ 5 V analog rail without level shifters |
| Three power modes | Full shutdown (1 µA), partial power-down (100 µA), and operational modes optimize energy per sample |
| SPI/QSPI/MICROWIRE compatibility | Direct integration with common DSP/microcontroller serial peripherals without protocol translation |
| Wide full-power bandwidth | 8.3 MHz (−3 dB) supports accurate digitization of fast transients and RF envelope detection |
Applications
| Portable Medical Sensors | Battery-Powered DAQ |
|---|---|
Use Scenario: ECG front-end digitizing low-amplitude biopotential signals in handheld monitors. IC Role / Device Role / Timing Role: Primary ADC capturing analog lead signals at 1 MSPS with <325 ns acquisition time for transient fidelity. Use Value: 68 dB SINAD ensures diagnostic-grade resolution; 4.5 mW power enables >24-hour operation on coin-cell batteries. | Use Scenario: Field-deployable environmental sensor node logging temperature, pressure, and humidity. IC Role / Device Role / Timing Role: Low-power sampling engine triggered by wake-up timer or external event, entering 1 µA shutdown between samples. Use Value: VDRIVE flexibility allows direct connection to 3.3 V MCU I/O; external reference ensures measurement stability across supply voltage drift. |
| Optical Sensor Interface | Industrial Handheld Tester |
Use Scenario: Photodiode current-to-voltage conversion and digitization in optical smoke detectors. IC Role / Device Role / Timing Role: High-speed acquisition of pulsed photodiode outputs with minimal aperture jitter (50 ps typ). Use Value: 8.3 MHz full-power bandwidth captures fast light pulses; 20 pF input capacitance simplifies op-amp drive requirements. | Use Scenario: Portable multimeter or insulation resistance tester requiring precision DC and AC measurements. IC Role / Device Role / Timing Role: Core ADC in dual-slope or SAR-based measurement engine, referenced to stable 2.5 V source. Use Value: Integral nonlinearity ≤±1.5 LSB ensures accuracy across full 12-bit range; SOIC/MSOP package supports automated assembly. |
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 |
|---|---|---|---|
| AD7476ARM | Same 8-lead MSOP package and pinout; 1 MSPS, but 10-bit resolution (not 12-bit); lower power (3.6 mW @ 3 V) | Suitable where 10-bit resolution suffices and board space/power budget is tighter | Select AD7476ARM only if system SNR requirements allow ≤60 dB SINAD and code depth < 1024 |
| ADS7822U | 12-bit, 200 kSPS max (vs. 1 MSPS); SPI-compatible; internal reference; 8-lead SOIC package | Fits cost-sensitive, lower-throughput designs where 200 kSPS meets sampling needs | Choose ADS7822U when throughput demand is ≤200 kSPS and integrated reference reduces BOM count |
Compared with AD7475ARM, AD7476ARM trades 2 bits of resolution for lower power and cost, while ADS7822U sacrifices speed for integrated reference and lower price - neither offers pin-to-pin compatibility or identical timing behavior.
Availability
AD7475ARM is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensor interfaces requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for AD7475ARM 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.
The AD7475ARM belongs to the AD747x family of micropower SAR ADCs designed specifically for space- and power-constrained signal acquisition in portable and industrial instrumentation.
FAQ
What is the maximum recommended clock frequency for the AD7475ARM serial interface?
The AD7475ARM supports SCLK frequencies from 10 kHz to 20 MHz. At 20 MHz, conversion completes in 800 ns (16 cycles). Exceeding 20 MHz violates absolute maximum ratings and risks timing failure or latch-up. For reliable operation, maintain SCLK duty cycle between 40/60 and 60/40, with rise/fall times ≤5 ns.
Does the AD7475ARM include an internal voltage reference?
No, the AD7475ARM requires an external 2.5 V ±1% reference applied to the REF IN pin. Unlike the AD7495, it has no on-chip reference. A minimum 0.1 µF capacitor must be placed between REF IN and GND for stability. The AD7475ARM's reference input leakage is ±1 µA max, supporting standard precision references like the AD780 or REF192.
How does the VDRIVE pin function in the AD7475ARM?
The VDRIVE pin sets logic threshold voltages for all digital I/O pins (CS, SCLK, SDATA) independently of VDD. When VDRIVE = 3 V, inputs recognize logic high ≥2 V and outputs swing 0.4 V to 2.8 V - enabling direct interfacing with 3 V processors even if VDD = 5 V. This eliminates level-shifter components and simplifies mixed-voltage system design.
What is the guaranteed integral nonlinearity (INL) specification for the AD7475ARM across temperature?
The AD7475ARM guarantees ±1.5 LSB max INL over the full operating temperature range (−40°C to +85°C) at 5 V supply, and ±1 LSB max at 3 V supply. At 25°C, typical INL is ±0.5 LSB. This ensures monotonicity and no missing codes across all 4096 levels, critical for closed-loop control and precision measurement applications using the AD7475ARM.
Can the AD7475ARM operate with a 2.5 V VDD supply?
No - the AD7475ARM specifies a minimum VDD of 2.7 V. Operation below 2.7 V violates the absolute maximum ratings table and may cause conversion errors, increased INL, or failure to meet timing specifications. The device is characterized and guaranteed only from 2.7 V to 5.25 V; for true 2.5 V operation, consider the AD7477A or AD7482 families instead of the AD7475ARM.
AD7475ARM 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:
- -
AD7475ARM FAQ
1.How can I place an order for AD7475ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7475ARM 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 AD7475ARM reliable?
The price and inventory of AD7475ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7475ARM is usually 5 days.
3.What payment methods are accepted for AD7475ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7475ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7475ARM?
AD7475ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7475ARM 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 AD7475ARM?
For technical support, including AD7475ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7475ARM requirements.
6.How does Aetrix verify that AD7475ARM is sourced from the original manufacturer or authorized distributors?
All AD7475ARM 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 AD7475ARM meets industry standards.
7.What is the process for return or replacement of AD7475ARM?
All AD7475ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7475ARM, 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 AD7475ARM part is unused and in its original packaging.
Return procedure for AD7475ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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