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Analog Devices Inc. AD7476SRT-500RL7
- Part No.:
- AD7476SRT-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7476SRT-500RL7.pdf
- Description:
- IC ADC 12BIT 1MSPS SOT-23-6 TR
- Quantity:
- Payment:
- Shipping:
Inventory:986
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Product details
Overview
AD7476SRT-500RL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.35 V to 5.25 V supply, delivering 70 dB SNR at 100 kHz input frequency and featuring no pipeline delay for deterministic timing in battery-powered data acquisition systems.
For engineers reviewing the AD7476SRT-500RL7 datasheet, AD7476SRT-500RL7 pinout, AD7476SRT-500RL7 application, or AD7476SRT-500RL7 equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL, 1 μA standby current, SPI-compatible serial interface, and single-supply operation supporting 0 V to VDD analog input range.
Technical Context
The AD7476SRT-500RL7 implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its reference is derived internally from VDD, eliminating external reference components while maintaining full-scale input range from 0 V to VDD.
Timing is fully controlled by the external serial clock (SCLK), with conversion rate directly proportional to SCLK frequency-up to 20 MHz for A-version operation. The device supports flexible power management via CS-controlled shutdown, achieving 1 μA max quiescent current and no latency between command and sample initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensing applications. |
| Throughput Rate | 1 MSPS - enables real-time capture of fast transients up to 500 kHz Nyquist bandwidth without undersampling. |
| SNR @ 100 kHz | 70 dB min - supports accurate measurement of low-amplitude signals in noisy environments such as portable medical instruments. |
| INL | ±1.5 LSB max - ensures monotonicity and predictable transfer function behavior across full temperature range (−40°C to +85°C). |
| Supply Range | 2.35 V to 5.25 V - allows direct interfacing with Li-ion, 3.3 V, and 5 V logic domains without level-shifting circuitry. |
| Standby Current | 1 μA max - extends battery life in intermittent-sampling systems like handheld diagnostic tools. |
| Conversion Time | 0.8 μs max - guarantees sub-microsecond latency from CS assertion to data availability on SDATA. |
| Input Range | 0 V to VDD - simplifies sensor interface design by eliminating need for external biasing or rail-to-rail op-amp drivers. |
Pinout & Package
AD7476SRT-500RL7 is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Single 2.35–5.25 V supply powers analog core, digital interface, and internal reference; no separate AVDD/DVDD required. |
| GND (Pin 2) | Analog ground reference | Common return path for VIN, internal reference, and track-and-hold; must be connected to low-impedance system ground plane. |
| VIN (Pin 3) | Analog input channel | Single-ended input accepting 0 V to VDD range; 30 pF input capacitance requires careful driver impedance matching for settling. |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data clocking; supports up to 20 MHz for 1 MSPS operation; determines throughput rate directly. |
| SDATA (Pin 5) | Serial data output | MSB-first 16-bit frame: four leading zeros + 12-bit result; tri-state enabled when CS is high; compatible with SPI/QSPI/MICROWIRE. |
| CS (Pin 6) | Chip select / conversion trigger | Active-low signal initiates sampling on falling edge and frames serial data transfer; also enters shutdown mode when held high between conversions. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic, zero-latency conversion start and completion-critical for time-triggered control loops and synchronized multi-channel sampling. |
| Internal VDD-referenced ADC | Eliminates external reference IC and associated layout complexity while preserving full dynamic range across supply voltage variations. |
| 1 μA shutdown current | Reduces average power in duty-cycled systems (e.g., wireless sensor nodes) to sub-μW levels during idle periods without sacrificing wake-up speed. |
| SPI-/QSPI-/MICROWIRE-compatible interface | Enables plug-and-play integration with common microcontrollers (ARM Cortex-M, MSP430, PIC) without custom protocol firmware or glue logic. |
| 6-lead SOT-23 footprint | Minimizes board area and thermal mass-ideal for wearable devices and compact instrumentation where size and self-heating are critical constraints. |
| 70 dB SNR @ 100 kHz | Supports high-fidelity digitization of audio-band and sensor signals (e.g., piezoelectric accelerometers, strain gauges) without oversampling or post-processing. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous monitoring of temperature, ECG, or blood oxygen using coin-cell or LiPo batteries with periodic wake-up and burst sampling. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring sensor outputs with precise timing control via CS-triggered sampling and deterministic 0.8 μs conversion. Use Value: 1 μA shutdown current and 3.6 mW active power at 3 V extend operational life to months; 12-bit resolution captures subtle physiological trends without interpolation. |
Use Scenario: Handheld pulse oximeters or glucose meters requiring rapid, low-noise digitization of photodiode or electrochemical sensor outputs. IC Role / Device Role / Timing Role: High-speed SAR ADC performing single-shot conversions synchronized to LED pulsing or electrode excitation waveforms. Use Value: 70 dB SNR at 100 kHz enables detection of weak optical signals amid ambient noise; 0 V to VDD input range simplifies front-end amplifier design. |
| Industrial Field Transmitters | Optical Communication Monitoring |
Use Scenario: 4–20 mA loop-powered sensors digitizing pressure, flow, or humidity in harsh industrial environments with wide temperature variation. IC Role / Device Role / Timing Role: Precision ADC converting conditioned analog signals under −40°C to +85°C operating range with guaranteed monotonicity (no missing codes). Use Value: ±1.5 LSB INL and ±2 LSB gain error ensure calibrated accuracy over full temperature range; SOT-23 package withstands reflow and mechanical stress. |
Use Scenario: Real-time monitoring of laser diode bias current or photodetector output in fiber-optic transceivers and optical test equipment. IC Role / Device Role / Timing Role: Fast-sampling ADC capturing transient events (e.g., laser turn-on overshoot, fault pulses) at up to 1 MSPS with minimal aperture jitter (30 ps). Use Value: 30 ps aperture jitter preserves signal integrity for high-frequency modulation analysis; 6.5 MHz full-power bandwidth supports accurate digitization of fast optical pulses. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS max, 3 V only, no internal reference - requires external VREF and higher supply headroom. | Lower precision, lower speed; suitable only for cost-sensitive, non-critical threshold detection. | Select only if 8-bit resolution and reduced throughput are acceptable and external reference design is feasible. |
| MAX1116EUT+T | 12-bit, 1 MSPS, but uses external reference and requires 2.7–3.6 V supply only; INL ±2 LSB, SNR 68 dB - slightly lower DC and AC performance. | Compatible in speed and resolution but demands additional reference IC and tighter supply regulation. | Choose when existing designs already use MAXIM's reference ecosystem or require pin-compatible migration within same family. |
Compared with ADS7822U and MAX1116EUT+T, AD7476SRT-500RL7 provides superior 12-bit accuracy with internal VDD reference, wider supply range (2.35–5.25 V), and guaranteed no missing codes - reducing BOM count and layout complexity while maintaining 1 MSPS throughput in the smallest possible footprint.
Availability
AD7476SRT-500RL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial field transmitters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AD7476SRT-500RL7 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 Norwood, MA, with decades of expertise in precision data conversion and signal conditioning.
The AD7476/AD7477/AD7478 family was designed specifically for ultra-compact, low-power, high-speed data acquisition in space- and energy-constrained applications-delivering 12-/10-/8-bit resolution in the industry's smallest 6-lead SOT-23 package without sacrificing AC or DC performance.
FAQ
What is the maximum sampling rate supported by the AD7476SRT-500RL7?
The AD7476SRT-500RL7 supports a maximum throughput rate of 1 MSPS when operated with a 20 MHz SCLK and VDD ≥ 2.7 V. At lower supply voltages (2.35–2.7 V), the maximum SCLK is 12 MHz, limiting throughput to 600 kSPS. This is confirmed in Table 1 of the Rev. F datasheet under "AD7476 Specifications" for the S version.
Does the AD7476SRT-500RL7 require an external reference voltage?
No, the AD7476SRT-500RL7 uses an internal reference derived from VDD, enabling a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference components and simplifies system design-confirmed in the General Description section and Figure 1 functional block diagram of the AD7476/AD7477/AD7478 datasheet.
What is the guaranteed integral nonlinearity (INL) specification for the AD7476SRT-500RL7?
The AD7476SRT-500RL7 has a guaranteed integral nonlinearity of ±1.5 LSB maximum over the full operating temperature range (−40°C to +85°C), as specified in Table 1 under "DC ACCURACY" for the S version. This ensures monotonic behavior and predictable transfer function linearity for precision measurement applications.
How does the AD7476SRT-500RL7 enter and exit power-down mode?
The AD7476SRT-500RL7 enters full power-down mode automatically when CS is held high and SCLK is inactive, drawing ≤1 μA. It exits power-down and begins conversion on the falling edge of CS, with typical power-up time of 1 μs (Table 4, tPOWER-UP). No separate command or reset sequence is required-operation is fully CS-driven.
Is the AD7476SRT-500RL7 compatible with standard SPI interfaces?
Yes, the AD7476SRT-500RL7 features an SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It outputs MSB-first data on SDATA synchronized to the falling edge of SCLK, with CS acting as frame synchronization-enabling direct connection to standard SPI peripherals on microcontrollers without protocol translation or bit-banging.
What is the aperture jitter performance of the AD7476SRT-500RL7?
The AD7476SRT-500RL7 exhibits 30 ps typical aperture jitter, as specified in Table 1 under "DYNAMIC PERFORMANCE." This low jitter contributes directly to its 70 dB SNR at 100 kHz input frequency and supports accurate digitization of high-frequency signals in optical and RF-sensing applications.
AD7476SRT-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7476SRT-500RL7 FAQ
1.How can I place an order for AD7476SRT-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7476SRT-500RL7 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 AD7476SRT-500RL7 reliable?
The price and inventory of AD7476SRT-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7476SRT-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7476SRT-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7476SRT-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7476SRT-500RL7?
AD7476SRT-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7476SRT-500RL7 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 AD7476SRT-500RL7?
For technical support, including AD7476SRT-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7476SRT-500RL7 requirements.
6.How does Aetrix verify that AD7476SRT-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7476SRT-500RL7 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 AD7476SRT-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7476SRT-500RL7?
All AD7476SRT-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7476SRT-500RL7, 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 AD7476SRT-500RL7 part is unused and in its original packaging.
Return procedure for AD7476SRT-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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