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Analog Devices Inc. AD7477SRTZ-REEL
- Part No.:
- AD7477SRTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
AD7477SRTZ-REEL.pdf
- Description:
- IC ADC 10BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,559
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Product details
Overview
AD7477SRTZ-REEL 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. It delivers 61 dB SINAD at 100 kHz input, 70 dB SNR (typ), and 10 ns aperture delay, serving as a compact, low-power analog-to-digital converter for space-constrained data acquisition nodes.
For engineers reviewing the AD7477SRTZ-REEL datasheet, AD7477SRTZ-REEL pinout, AD7477SRTZ-REEL application, or AD7477SRTZ-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for battery-powered instrumentation and portable sensing systems.
Technical Context
The AD7477SRTZ-REEL implements a standard successive-approximation register (SAR) architecture with no pipeline delay, using CS to initiate sampling on its falling edge and SCLK to control conversion timing. Its internal track-and-hold amplifier supports full-scale input bandwidth up to 6.5 MHz and handles input frequencies exceeding 100 kHz with 70 dB SNR (typ).
Conversion is SPI-/QSPI-/MICROWIRE-/DSP-compatible, with serial data output MSB-first: four leading zeros, then 10-bit result, followed by two trailing zeros. The reference is derived directly from VDD, enabling a 0 V to VDD analog input range without external reference components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for medium-precision sensor digitization. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz (Nyquist-limited) in high-speed portable instruments. |
| SINAD | 61 dB min at 100 kHz - ensures usable dynamic range for audio-band and baseband signal capture in medical PDA front-ends. |
| Power Dissipation | 4.8 mW max at 3 V / 1 MSPS - enables >100-hour operation on coin-cell batteries in handheld diagnostic tools. |
| Aperture Jitter | 30 ps typ - limits sampling uncertainty to <0.05 LSB at 100 kHz, preserving signal fidelity without external clock conditioning. |
| Input Range | 0 V to VDD - eliminates need for level-shifting circuitry when interfacing with single-supply op-amps or sensors. |
| Standby Current | 1 μA max - allows rapid wake-up from ultra-low-power sleep states in duty-cycled IoT sensor nodes. |
Pinout & Package
AD7477SRTZ-REEL uses a 6-lead SOT-23 package (JEDEC MO-178AA), footprint-compatible with industry-standard 0.95 mm pitch layouts and reflow-solderable per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Single 2.7–5.25 V rail powers both analog core and digital interface; also serves as internal reference voltage source. |
| GND | Analog ground reference | Common return for VIN and internal circuitry; must be routed separately from digital ground to preserve 61 dB SINAD. |
| VIN | Analog input channel | Single-ended input accepting 0 V to VDD range; 30 pF input capacitance requires careful driver impedance matching. |
| SCLK | Serial clock input | Controls conversion timing and data clocking; supports up to 20 MHz, enabling 800 ns conversion time (16 cycles). |
| SDATA | Serial data output | MSB-first 16-bit frame: 4 leading zeros + 10-bit result + 2 trailing zeros; tri-state capable for bus sharing. |
| CS | Chip select / conversion trigger | Active-low signal initiates sampling on falling edge; also frames serial data transfer-no separate START command needed. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR behavior enables deterministic latency (≤800 ns), critical for closed-loop control feedback paths. |
| Flexible power-clock scaling | Lowering SCLK frequency reduces average current draw proportionally-enabling adaptive power management in burst-mode systems. |
| Internal VDD-referenced conversion | Removes external reference IC and associated PCB area, BOM cost, and drift sources-ideal for miniaturized medical sensors. |
| 1 μA shutdown mode | Allows integration into always-on wearable devices where background monitoring consumes <1 μW between active sampling intervals. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to common microcontrollers (e.g., STM32, MSP430, nRF52) without protocol translation logic or firmware overhead. |
Applications
| Battery-Powered Medical Instruments | Portable Data Acquisition Systems |
|---|---|
Use Scenario: Handheld ECG or pulse oximeter capturing analog biosignals under tight size and battery-life constraints. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog front-end outputs at 1 MSPS with deterministic latency. Use Value: 10-bit resolution and 61 dB SINAD meet Class II medical device SNR requirements while 4.8 mW power enables >12-hour runtime on CR2032. |
Use Scenario: Field-deployable environmental sensor node logging temperature, humidity, and gas concentration. IC Role / Device Role / Timing Role: Low-power SAR ADC acquiring multi-channel sensor data via multiplexed inputs with minimal MCU intervention. Use Value: VDD-referenced input simplifies analog signal chain; 1 μA shutdown extends shelf life and field deployment duration without compromising sampling fidelity. |
| Mobile Communications Front-Ends | Optical Sensor Signal Conditioning |
Use Scenario: RF power detector or antenna tuning feedback loop in LTE/5G small-cell modules. IC Role / Device Role / Timing Role: Fast-response ADC measuring DC-coupled detector output for real-time PA bias adjustment. Use Value: 10 ns aperture delay and 30 ps jitter ensure accurate amplitude tracking across modulation bandwidths up to 100 kHz. |
Use Scenario: Compact optical smoke detector or ambient light sensor requiring precise photodiode current digitization. IC Role / Device Role / Timing Role: Single-supply ADC interfacing directly with transimpedance amplifier output. Use Value: 0 V to VDD input range matches typical TIA output swing; 6.5 MHz full-power bandwidth accommodates fast transient detection events. |
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-REEL | Same die, A-grade (-40°C to +85°C) vs. S-grade (-55°C to +125°C); identical electrical specs and pinout. | Commercial vs. extended temperature industrial/military use; S-grade qualified for harsh-environment automotive subsystems. | Select AD7477SRTZ-REEL for operation beyond +85°C; AD7477ARTZ-REEL suffices for consumer-grade portable electronics. |
| ADS7822U | 12-bit, 200 kSPS, 8-pin SOIC; higher resolution but lower speed and larger footprint; requires external reference. | Higher-precision, lower-throughput applications where board space and thermal budget allow SOIC packaging. | Choose ADS7822U only if 12-bit resolution is mandatory and 1 MSPS is not required; AD7477SRTZ-REEL offers superior speed/power density in SOT-23. |
Compared with AD7477ARTZ-REEL, the AD7477SRTZ-REEL provides guaranteed operation to +125°C without performance trade-offs, while ADS7822U trades throughput and package size for extra bits-making AD7477SRTZ-REEL optimal for thermally demanding, space-constrained 10-bit sampling.
Availability
AD7477SRTZ-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data acquisition systems, mobile communications front-ends, and optical sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for AD7477SRTZ-REEL 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 AD7476/AD7477/AD7478 family was designed for ultra-compact, low-power data acquisition in portable and battery-operated systems-prioritizing minimal footprint, single-supply simplicity, and deterministic SAR timing over multi-channel or differential input capability.
FAQ
What is the maximum sampling rate supported by the AD7477SRTZ-REEL?
The AD7477SRTZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16-cycle conversion sequence. This timing is valid across its full operating temperature range (−55°C to +125°C) and supply range (2.7 V to 5.25 V), making AD7477SRTZ-REEL suitable for real-time signal capture in high-reliability embedded systems.
Does the AD7477SRTZ-REEL require an external voltage reference?
No, the AD7477SRTZ-REEL uses an internal reference derived from the VDD supply, enabling a 0 V to VDD analog input range without external components. This simplifies design and reduces BOM count, though input accuracy tracks VDD stability-so a well-regulated supply is recommended for best INL performance.
What is the function of the CS pin on the AD7477SRTZ-REEL?
The CS (chip select) pin on the AD7477SRTZ-REEL serves a dual role: it initiates sampling on its falling edge and frames the serial data transfer. When CS goes low, the internal track-and-hold enters hold mode and conversion begins; data is clocked out on subsequent SCLK edges. This eliminates need for separate START or CONVST signals in AD7477SRTZ-REEL designs.
How does the power consumption of the AD7477SRTZ-REEL scale with throughput?
AD7477SRTZ-REEL power scales linearly with throughput: at 1 MSPS and 3 V, it draws 1.6 mA (4.8 mW); at standby, it drops to 1 μA. Reducing SCLK frequency lowers average current, allowing dynamic power management-e.g., running at 100 kSPS cuts power to ~0.5 mW, extending battery life in intermittent-sampling applications using AD7477SRTZ-REEL.
Is the AD7477SRTZ-REEL pin-compatible with other members of the AD7476/AD7477/AD7478 family?
Yes, all variants-including AD7476, AD7477, and AD7478 in SOT-23-share identical 6-lead pinout (VDD, GND, VIN, SCLK, SDATA, CS) and SPI-compatible serial interface. This allows hardware reuse across 8-, 10-, and 12-bit versions; only firmware and layout derating (e.g., for SNR differences) require adjustment when substituting AD7477SRTZ-REEL with AD7476SRTZ-REEL or AD7478SRTZ-REEL.
AD7477SRTZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 10
- 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:
- Supply
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7477SRTZ-REEL FAQ
1.How can I place an order for AD7477SRTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7477SRTZ-REEL 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 AD7477SRTZ-REEL reliable?
The price and inventory of AD7477SRTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7477SRTZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7477SRTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7477SRTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7477SRTZ-REEL?
AD7477SRTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7477SRTZ-REEL 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 AD7477SRTZ-REEL?
For technical support, including AD7477SRTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7477SRTZ-REEL requirements.
6.How does Aetrix verify that AD7477SRTZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7477SRTZ-REEL 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 AD7477SRTZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7477SRTZ-REEL?
All AD7477SRTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7477SRTZ-REEL, 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 AD7477SRTZ-REEL part is unused and in its original packaging.
Return procedure for AD7477SRTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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