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Analog Devices Inc. AD7477AAKSZ-500RL7
- Part No.:
- AD7477AAKSZ-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AD7477AAKSZ-500RL7.pdf
- Description:
- IC ADC 10BIT SAR SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,312
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Product details
Overview
AD7477AAKSZ-500RL7 from Analog Devices is a 10-bit, 1 MSPS successive-approximation ADC in a 6-lead SC70 package, operating from 2.35 V to 5.25 V supply. It delivers 61 dB SINAD at 100 kHz input, 71 dB SNR (typ), and ±0.5 LSB INL/±0.5 LSB DNL, enabling high-fidelity signal digitization in space-constrained battery-powered instrumentation.
For engineers reviewing the AD7477AAKSZ-500RL7 datasheet, AD7477AAKSZ-500RL7 pinout, AD7477AAKSZ-500RL7 application, or AD7477AAKSZ-500RL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts for 10-bit, 1 MSPS, SC70-packaged SAR ADCs with SPI-compatible serial interface and internal VDD-referenced conversion.
Technical Context
The AD7477AAKSZ-500RL7 implements a standard successive-approximation register (SAR) architecture with no pipeline delay, where sampling is triggered on the falling edge of CS and conversion is clocked by SCLK. Its track-and-hold amplifier supports full-power bandwidth up to 13.5 MHz and acquisition time ≤250 ns.
It uses an internal VDD-derived reference, fixing the analog input range to 0 V to VDD, and features SPI/QSPI/MICROWIRE/DSP-compatible serial output with MSB-first 14-bit frame (4 leading zeros + 10 data bits + 2 trailing zeros). Power-down current is ≤1 µA, enabling ultra-low quiescent operation between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1,024 discrete digital codes for medium-precision sensor or control loop feedback digitization. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz (Nyquist-limited) without oversampling penalty. |
| SINAD | 61 dB min at 100 kHz - ensures ≥9.8 effective number of bits (ENOB) for clean dynamic signal capture in noisy environments. |
| INL / DNL | ±0.5 LSB max - guarantees monotonicity and no missing codes across full scale, critical for closed-loop control accuracy. |
| Supply Range | 2.35 V to 5.25 V - enables direct interfacing with 3.3 V or 5 V microcontrollers and compatibility with Li-ion (3.0–4.2 V) battery rails. |
| Power Dissipation | 5.1 mW max at 5 V / 1 MSPS - allows continuous high-speed operation in thermally constrained handheld devices. |
| Standby Current | 1 µA max - reduces system-level standby power to sub-microwatt levels during idle intervals. |
Pinout & Package
AD7477AAKSZ-500RL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm body, 0.65 mm pitch), optimized for ultra-compact PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low conversion trigger and serial frame sync; falling edge initiates sampling and conversion, defining precise acquisition timing. |
| 2 (SCLK) | Serial Clock | Master clock input controlling both conversion speed and data readout; 14 SCLK cycles required per 10-bit result (4+10+0). |
| 3 (SDATA) | Serial Data Output | Three-state CMOS output delivering 14-bit frame (MSB first); high-impedance when CS high, enabling bus sharing. |
| 4 (VIN) | Analog Input | Single-ended input referenced to GND; accepts 0 V to VDD range with 20 pF input capacitance and ±0.5 µA leakage. |
| 5 (GND) | Analog Ground | Common return for analog circuitry and VIN reference; must be isolated from digital ground to preserve SNR. |
| 6 (VDD) | Power Supply | Single supply powering analog core, reference, and digital interface; also serves as internal reference voltage source. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, single-cycle latency from CS assertion to valid data - essential for time-critical control loops. |
| VDD-referenced conversion | Eliminates external reference component and layout complexity while maintaining full-scale linearity across supply variation. |
| SPI/QSPI/MICROWIRE compatibility | Direct drop-in integration with common MCU peripherals (e.g., STM32 SPI, TI C2000 ePWM, NXP Kinetis) without protocol translation. |
| SC70 footprint | Reduces board area by >50% vs. MSOP-8 equivalents, enabling placement directly adjacent to sensors or op-amp front-ends. |
| 1 µA standby mode | Supports duty-cycled acquisition schemes (e.g., 1 kSPS average rate) with <100 nW average power consumption. |
Applications
| Battery-Powered Medical Sensors | Portable Instrumentation Front-End |
|---|---|
Use Scenario: Digitizing ECG or pulse oximeter analog outputs in handheld clinical devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary SAR ADC acquiring conditioned biopotential signals at 1–2 kSPS with low-latency, no-pipeline response to trigger events. Use Value: 10-bit resolution and 61 dB SINAD preserve diagnostic waveform fidelity; 2.35 V minimum supply enables operation down to 3.0 V battery voltage without regulator. |
Use Scenario: Capturing sensor outputs (temperature, pressure, strain) in field-deployable test equipment with limited PCB space. IC Role / Device Role / Timing Role: High-speed, low-power ADC interfacing directly to op-amp buffers and microcontroller SPI peripheral. Use Value: SC70 package minimizes trace length and parasitic capacitance, preserving 71 dB SNR performance; 1 µA standby extends battery life during measurement idle periods. |
| Optical Sensor Signal Chain | Industrial Control Loop Feedback |
Use Scenario: Converting photodiode or ambient light sensor current (via transimpedance amp) in smart lighting or gesture recognition modules. IC Role / Device Role / Timing Role: Medium-speed ADC sampling analog outputs of optical front-end ICs with minimal power overhead. Use Value: Internal VDD reference eliminates need for precision external reference, reducing BOM count and layout sensitivity to noise coupling. |
Use Scenario: Sampling motor current or position feedback in compact servo drives or PLC I/O modules. IC Role / Device Role / Timing Role: Deterministic-latency ADC providing timely feedback for PID computation in real-time control firmware. Use Value: No pipeline delay ensures consistent 1 µs conversion-to-data latency, simplifying timing budgeting in closed-loop cycle timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, 1 MSPS SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7477ARMZ | Same die, 8-lead MSOP package (3.0 mm × 3.0 mm); identical electrical specs and timing. | Requires larger PCB area but offers better thermal dissipation (θJA = 205.9°C/W vs. 340.2°C/W) and easier hand-soldering. | Select AD7477ARMZ when thermal margin or assembly yield outweighs size constraints. |
| ADS7822U | 12-bit, 200 kSPS, 8-lead SOIC; lower throughput, higher resolution; requires external reference; 2.7–5.25 V supply. | Not suitable for 1 MSPS systems; better for precision DC measurements (e.g., thermocouple cold-junction compensation) where speed is secondary. | Select ADS7822U only if resolution >10 bits is mandatory and throughput ≤200 kSPS is acceptable. |
Compared with AD7477ARMZ, AD7477AAKSZ-500RL7 saves >70% board area and enables tighter sensor-ADC coupling, while ADS7822U trades speed for resolution and adds reference design complexity-neither is pin-compatible, but both serve overlapping medium-speed data acquisition roles with distinct trade-offs.
Availability
AD7477AAKSZ-500RL7 is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable instrumentation front-ends, optical sensor signal chains, and industrial control loop feedback requiring stable component supply and long-term production continuity.
Supply support for AD7477AAKSZ-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.
The AD7476A/AD7477A/AD7478A family was designed to deliver high-speed, low-power SAR ADC functionality in the smallest possible footprint-specifically targeting space- and power-constrained portable and battery-operated systems.
FAQ
What is the maximum sample rate supported by the AD7477AAKSZ-500RL7?
The AD7477AAKSZ-500RL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 14 SCLK cycles per conversion. At lower SCLK frequencies (e.g., 5 MHz), the throughput scales linearly down to ~315 kSPS while maintaining full 10-bit accuracy and monotonicity.
Does the AD7477AAKSZ-500RL7 require an external reference voltage?
No, the AD7477AAKSZ-500RL7 uses an internal reference derived from VDD, setting the full-scale analog input range to 0 V to VDD. This eliminates the need for external reference components and simplifies layout, though it ties dynamic range directly to supply stability.
What is the analog input voltage range for the AD7477AAKSZ-500RL7?
The analog input range of the AD7477AAKSZ-500RL7 is 0 V to VDD, where VDD may be any value from 2.35 V to 5.25 V. For example, with a 3.3 V supply, VIN accepts 0 V to 3.3 V; with a 5.0 V supply, it accepts 0 V to 5.0 V.
How does the AD7477AAKSZ-500RL7 handle power-down mode?
The AD7477AAKSZ-500RL7 enters full power-down mode when CS remains high and no SCLK activity occurs, drawing ≤1 µA (typically 50 nA). Recovery time from power-down to first valid conversion is ≤1 µs, enabling rapid wake-up for burst-mode sampling.
Is the AD7477AAKSZ-500RL7 compatible with standard SPI interfaces?
Yes, the AD7477AAKSZ-500RL7 is SPI/QSPI/MICROWIRE/DSP-compatible: it uses CS as frame select, SCLK as master clock, and SDATA as MOSI-like output (no input), with data valid on SCLK falling edges and MSB-first framing - requiring only minor configuration (e.g., CPOL=0, CPHA=1) on most SPI controllers.
AD7477AAKSZ-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- SC-70-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7477AAKSZ-500RL7 FAQ
1.How can I place an order for AD7477AAKSZ-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7477AAKSZ-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 AD7477AAKSZ-500RL7 reliable?
The price and inventory of AD7477AAKSZ-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7477AAKSZ-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7477AAKSZ-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7477AAKSZ-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7477AAKSZ-500RL7?
AD7477AAKSZ-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7477AAKSZ-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 AD7477AAKSZ-500RL7?
For technical support, including AD7477AAKSZ-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7477AAKSZ-500RL7 requirements.
6.How does Aetrix verify that AD7477AAKSZ-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7477AAKSZ-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 AD7477AAKSZ-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7477AAKSZ-500RL7?
All AD7477AAKSZ-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7477AAKSZ-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 AD7477AAKSZ-500RL7 part is unused and in its original packaging.
Return procedure for AD7477AAKSZ-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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