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Analog Devices Inc. AD7477SRT-REEL7
- Part No.:
- AD7477SRT-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7477SRT-REEL7.pdf
- Description:
- IC ADC 10BIT 1MSPS SOT-23-6 T/R
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
AD7477SRT-REEL7 from Analog Devices is a 10-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.7 V to 5.25 V supply, delivering 61 dB SINAD at 100 kHz input and consuming 4.8 mW at 3 V/1 MSPS. It serves as a high-speed, low-power analog-to-digital converter for battery-constrained signal acquisition in portable instrumentation.
For engineers reviewing the AD7477SRT-REEL7 datasheet, AD7477SRT-REEL7 pinout, AD7477SRT-REEL7 application, or AD7477SRT-REEL7 equivalent, key selection considerations include its 10-bit resolution, SPI-compatible serial interface, no-pipeline-delay conversion architecture, internal VDD-referenced input range (0 V to VDD), and guaranteed no-missed-codes performance.
Technical Context
The AD7477SRT-REEL7 implements a standard successive-approximation register (SAR) architecture with a track-and-hold amplifier supporting >6 MHz input bandwidth and 400 ns acquisition time. Conversion is initiated on the falling edge of CS and synchronized entirely to the external SCLK, eliminating pipeline latency.
It uses an internal VDD-based reference, enabling full-scale analog input range from 0 V to VDD without external components. Its serial interface is fully compatible with SPI, QSPI, MICROWIRE, and DSP host controllers, with data output MSB-first and fixed 16-cycle timing (four leading zeros + 10 data bits + two trailing zeros).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for precise amplitude quantization in medium-speed data acquisition. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz Nyquist bandwidth with minimal latency. |
| SINAD @ 100 kHz | 61 dB min - ensures usable dynamic range for audio-band and sensor signals with moderate harmonic content. |
| Power Dissipation | 4.8 mW max at 3 V/1 MSPS - enables operation in energy-sensitive applications such as handheld medical devices. |
| Analog Input Range | 0 V to VDD - eliminates need for external level-shifting or reference buffers when interfacing with single-supply sensors. |
| Conversion Time | 800 ns max - fixed 16-SCLK-cycle timing enables deterministic timing budgeting in synchronous systems. |
| Standby Current | 1 μA max - allows rapid wake-up from ultra-low-power sleep states without significant start-up delay. |
Pinout & Package
AD7477SRT-REEL7 is housed in a RoHS-compliant, Pb-free 6-lead SOT-23 package (JEDEC MO-178AA), with 1.0 mm pitch, 2.9 mm × 1.6 mm footprint, and thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | Single 2.7–5.25 V supply powering both analog and digital sections; also serves as internal reference source. |
| GND (Pin 2) | Analog Ground Reference | Common return path for analog circuitry; must be routed separately from digital ground to preserve SNR. |
| VIN (Pin 3) | Analog Input Channel | Single-ended input accepting 0 V to VDD range; requires external anti-aliasing filter for >6.5 MHz full-power bandwidth. |
| SCLK (Pin 4) | Serial Clock Input | Master clock driving conversion timing and data transfer; supports up to 20 MHz for 1 MSPS operation. |
| SDATA (Pin 5) | Serial Data Output | Three-state CMOS output delivering 16-bit frame (4 leading zeros + 10-bit result + 2 trailing zeros) MSB-first on SCLK falling edge. |
| CS (Pin 6) | Chip Select / Conversion Trigger | Active-low signal initiating sample-and-hold on falling edge and framing serial data window; no minimum pulse width beyond 10 ns. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture provides deterministic, single-cycle conversion with zero-latency output - critical for closed-loop control timing. |
| VDD-referenced input | Eliminates external voltage reference and associated layout complexity while maintaining full-scale utilization across supply variations. |
| Flexible serial clock management | Conversion rate scales directly with SCLK frequency, enabling dynamic power/performance trade-offs without firmware changes. |
| Guaranteed no-missed-codes | Ensures monotonic transfer function across full 10-bit range - essential for position sensing and closed-loop feedback accuracy. |
| Ultra-low standby current | 1 μA shutdown mode reduces system-level quiescent power in intermittent-sampling applications like wireless sensor nodes. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Continuous acquisition of ECG or pulse oximetry signals in handheld diagnostic tools powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary analog front-end digitizer performing single-ended 10-bit sampling at 1 MSPS with minimal power overhead. Use Value: 4.8 mW consumption at 3 V enables >100 hours of operation on a 300 mAh battery, while 61 dB SINAD preserves clinical-grade waveform fidelity. |
Use Scenario: Multi-channel voltage monitoring in DIN-rail-mounted condition-monitoring units deployed in factory automation environments. IC Role / Device Role / Timing Role: High-reliability, temperature-stable ADC interfacing with isolated sensor outputs and microcontroller via SPI. Use Value: −55°C to +125°C extended temperature grade (S version) ensures consistent 10-bit linearity across industrial thermal cycles without calibration drift. |
| Optical Sensor Interfaces | Mobile Communication Front Ends |
|
Use Scenario: Digitizing photodiode or ambient light sensor outputs in compact optical modules for smart lighting or gesture recognition. IC Role / Device Role / Timing Role: Low-noise, wide-input-bandwidth ADC capturing fast transient light pulses with <10 ns aperture jitter. Use Value: 30 ps aperture jitter and 6.5 MHz full-power bandwidth support accurate time-of-flight or modulation depth measurement in pulsed optical systems. |
Use Scenario: Baseband signal conditioning in legacy 2G/3G RF modules where space and BOM count are constrained. IC Role / Device Role / Timing Role: Compact, single-supply ADC converting RSSI or PA bias monitor signals into digital domain for DSP processing. Use Value: 6-lead SOT-23 footprint (2.9 × 1.6 mm) reduces PCB area by >60% versus SOIC-8 alternatives while maintaining SPI compatibility with existing firmware stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7477ARTZ-REEL7 | Same die, but in 6-lead SOT-23-6 with different tape-and-reel packaging (TRAY vs. REEL7); identical electrical specs and pinout. | No functional difference - used interchangeably in automated assembly; REEL7 denotes 1,000-piece reel, ARTZ denotes same device in tray format. | Select AD7477SRT-REEL7 for high-volume pick-and-place; choose ARTZ only if tray handling is required for prototyping or low-volume builds. |
| ADS7822U | 12-bit, 200 kSPS, 8-lead SOIC; higher resolution but lower speed and larger package; requires external reference and separate AVDD/DVDD supplies. | Better resolution for precision instrumentation, but unsuitable for 1 MSPS or space-constrained designs due to speed and footprint limitations. | Choose ADS7822U only when 12-bit accuracy outweighs throughput and size requirements; AD7477SRT-REEL7 remains optimal for 10-bit/1 MSPS/SOT-23 use cases. |
Compared with AD7477ARTZ-REEL7, AD7477SRT-REEL7 offers identical performance in optimized reel packaging for SMT production; compared with ADS7822U, it trades 2-bit resolution for 5× higher throughput, 33% smaller footprint, and single-supply simplicity - making it superior for portable, real-time signal capture.
Availability
AD7477SRT-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, optical sensor interfaces, and industrial data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for AD7477SRT-REEL7 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 design and manufacturing expertise spanning over 50 years.
The AD7476/AD7477/AD7478 family was engineered specifically for space- and power-constrained data acquisition, delivering high-speed SAR performance in the smallest possible footprint - targeting portable instrumentation, sensor nodes, and embedded control systems.
FAQ
What is the maximum sampling rate supported by the AD7477SRT-REEL7?
The AD7477SRT-REEL7 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V and SCLK = 20 MHz. This is achieved using a fixed 16-clock-cycle conversion sequence, with each sample completed in ≤800 ns. The device maintains this rate across its full operating temperature range (−55°C to +125°C for the S version).
Does the AD7477SRT-REEL7 require an external voltage reference?
No, the AD7477SRT-REEL7 uses an internal reference derived from VDD, establishing a 0 V to VDD analog input range. This eliminates the need for external reference components, simplifies PCB layout, and reduces BOM cost. The reference tracking follows VDD variations, preserving relative accuracy without additional calibration.
How is data formatted on the SDATA pin of the AD7477SRT-REEL7?
The AD7477SRT-REEL7 outputs a 16-bit serial frame on SDATA: four leading zeros, followed by the 10-bit conversion result (MSB first), followed by two trailing zeros. This structure ensures consistent timing alignment across the AD7476/AD7477/AD7478 family and simplifies host-side bit extraction without shifting logic.
What is the guaranteed performance of the AD7477SRT-REEL7 over temperature?
The AD7477SRT-REEL7 (S version) is specified from −55°C to +125°C. Key parameters including 10-bit resolution, ±1 LSB integral nonlinearity, 61 dB SINAD at 100 kHz, and 1 MSPS throughput are guaranteed across this full range. DC accuracy specs (offset, gain error) and power consumption remain within published limits without derating.
Can the AD7477SRT-REEL7 interface directly with a 1.8 V microcontroller?
Yes - the AD7477SRT-REEL7 supports logic inputs down to 1.8 V for VINH when VDD ≥ 2.7 V, and its SDATA output swings from 0 V to VDD − 0.2 V, allowing direct connection to 1.8 V I/O domains when VDD = 2.7 V. Level-shifting is unnecessary if the host controller's input thresholds align with AD7477SRT-REEL7's output swing.
AD7477SRT-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 10
- 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:
- -
AD7477SRT-REEL7 FAQ
1.How can I place an order for AD7477SRT-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7477SRT-REEL7 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 AD7477SRT-REEL7 reliable?
The price and inventory of AD7477SRT-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7477SRT-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7477SRT-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7477SRT-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7477SRT-REEL7?
AD7477SRT-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7477SRT-REEL7 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 AD7477SRT-REEL7?
For technical support, including AD7477SRT-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7477SRT-REEL7 requirements.
6.How does Aetrix verify that AD7477SRT-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7477SRT-REEL7 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 AD7477SRT-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7477SRT-REEL7?
All AD7477SRT-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7477SRT-REEL7, 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 AD7477SRT-REEL7 part is unused and in its original packaging.
Return procedure for AD7477SRT-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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