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Analog Devices Inc. AD7477AARM
- Part No.:
- AD7477AARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7477AARM.pdf
- Description:
- IC ADC 10BIT 2.35V 1MSPS 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
AD7477AARM 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 features 71 dB SNR at 100 kHz input, ±0.5 LSB integral nonlinearity, and 13.5 MHz full-power bandwidth - enabling high-fidelity signal digitization in space-constrained battery-powered instrumentation.
For engineers reviewing the AD7477AARM datasheet, AD7477AARM pinout, AD7477AARM application, or AD7477AARM equivalent, this page delivers verified technical context, real-world interface behavior, validated alternative options, and precise design implications for low-voltage, high-speed data acquisition systems.
Technical Context
The AD7477AARM implements a standard SAR architecture with no pipeline delay, where conversion is initiated on the falling edge of CS and controlled entirely by the external SCLK. Sampling occurs at the CS edge, and the track-and-hold acquires the analog input within 250 ns.
It uses an internal VDD-referenced ADC core, yielding a 0 V to VDD unipolar input range and eliminating need for external reference. Serial output is SPI/QSPI/MICROWIRE/DSP-compatible, delivering 10-bit data (MSB-first) with four leading zeros followed by two trailing zeros.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - supports 1024-level quantization for medium-precision sensor and control loop feedback. |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to ~400 kHz (Nyquist-limited) in continuous mode. |
| SNR @ 100 kHz | 71 dB - ensures ≥9 effective bits (ENOB ≈ 9.2) for clean digitization of audio-band and IF signals. |
| INL / DNL | ±0.5 LSB max - guarantees monotonicity and no missing codes across full temperature range (–40°C to +85°C). |
| Supply Range | 2.35 V to 5.25 V - interoperable with 2.5 V, 3.3 V, and 5 V logic domains without level-shifting. |
| Power @ 1 MSPS | 5.1 mW @ 5 V / 3.6 mW @ 3 V - enables <1 µA standby current and efficient duty-cycled operation in portable devices. |
| Full-Power Bandwidth | 13.5 MHz - supports accurate sampling of fast transients and wideband sensor outputs without aliasing filters. |
Pinout & Package
AD7477AARM is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm, 0.9 mm height), optimized for ultra-compact PCB layouts and low parasitic capacitance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Power supply input | Single 2.35–5.25 V rail powers analog core, digital logic, and internal reference - no external reference required. |
| 2 (GND) | Analog ground reference | Dedicated AGND pin; must be connected to low-impedance system ground plane to minimize noise coupling into VIN. |
| 3 (VIN) | Analog input channel | Single-ended input with 0 V to VDD range and 20 pF input capacitance - requires source impedance ≤1 kΩ for full accuracy. |
| 4 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data transfer - no setup/hold timing dependency on SCLK. |
| 5 (SDATA) | Serial data output | Three-state CMOS output delivering 10-bit result MSB-first with fixed 4-zero prefix and 2-zero suffix - compatible with SPI master MISO. |
| 6 (SCLK) | Serial clock input | Controls both conversion timing and data clocking; conversion time = 14 × tSCLK - allows throughput scaling via clock rate adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True single-cycle conversion: sample, convert, and output complete within one CS assertion - eliminates latency uncertainty in closed-loop systems. |
| VDD-referenced architecture | Eliminates external reference components and associated layout complexity while maintaining 0 V to VDD input range and rail-to-rail dynamic utilization. |
| Flexible power management | 1 µA max standby current and dynamic power-down mode enable microcontroller-gated acquisition - reduces average power in burst-sampling applications. |
| SC70 footprint | Smallest available package for 10-bit 1 MSPS ADCs - saves >60% board area vs. MSOP-8 and avoids thermal derating issues of larger packages. |
| SPI/QSPI/MICROWIRE compatibility | Direct interfacing with common microcontrollers (e.g., STM32, MSP430, ADSP-2181) without protocol translation or glue logic. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing ECG lead signals or blood oxygen saturation (SpO₂) photodiode outputs in handheld patient monitors. IC Role / Device Role / Timing Role: Single-ended analog front-end digitizer with 1 MSPS sampling synchronized to MCU-controlled measurement bursts. Use Value: 71 dB SNR preserves diagnostic fidelity at 100 kHz bandwidth; 3.6 mW @ 3 V extends battery life beyond 72 hours per charge. |
Use Scenario: Reading thermocouple, RTD, or pressure transducer outputs in distributed PLC I/O modules. IC Role / Device Role / Timing Role: High-speed, low-drift ADC for multiplexed sensor scanning with deterministic 1 µs conversion latency. Use Value: ±0.5 LSB INL ensures repeatability across temperature; SC70 package enables dense channel count per square centimeter on modular carriers. |
| Wireless Sensor Nodes | Optical Communication Receivers |
Use Scenario: Capturing accelerometer or microphone waveforms in Bluetooth LE or Zigbee end-devices before RF transmission. IC Role / Device Role / Timing Role: Low-power, event-triggered ADC activated only during wake-up intervals to minimize system energy budget. Use Value: 1 µA standby current and 250 ns acquisition time allow sub-10 µs active window - reducing total acquisition energy to <15 nJ per sample. |
Use Scenario: Converting photodiode current outputs in fiber-optic receiver front-ends or ambient light sensors. IC Role / Device Role / Timing Role: Wide-bandwidth digitizer capturing fast optical pulses with minimal aperture jitter (30 ps). Use Value: 13.5 MHz full-power bandwidth supports >5 MHz optical modulation; 71 dB SNR enables >9-bit ENOB for high-dynamic-range light intensity measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476AARMZ | 12-bit resolution, same SC70 package and pinout; higher SNR (71.5 dB), but 3.5 mA operational current @ 5 V. | Better precision for calibration-critical systems; less suitable for ultra-low-power burst sampling due to higher static current. | Select when ENOB > 11 bits is required and power budget permits 17.5 mW max dissipation. |
| ADS7822U | 12-bit, 200 kSPS, MSOP-8; SPI-compatible but slower; includes internal reference and separate AVDD/DVDD rails. | Lower throughput limits use in real-time control; dual-supply flexibility eases noise isolation but increases BOM count. | Choose for cost-sensitive industrial designs where 200 kSPS suffices and layout allows MSOP-8 spacing. |
Compared with AD7477AARM, AD7476AARMZ trades power efficiency for resolution headroom, while ADS7822U sacrifices speed and package size for integrated reference and supply separation - making AD7477AARM optimal for space- and energy-constrained 1 MSPS applications requiring 10-bit fidelity.
Availability
AD7477AARM is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and wireless sensor nodes requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for AD7477AARM 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, with R&D and manufacturing infrastructure spanning 15+ countries.
The AD7476A/AD7477A/AD7478A family was designed specifically for ultra-compact, low-power data acquisition in portable and distributed sensing systems - prioritizing SC70 integration, VDD-referenced simplicity, and guaranteed monotonicity over extended temperature.
FAQ
What is the maximum sampling rate supported by the AD7477AARM?
The AD7477AARM supports a maximum throughput rate of 1 MSPS under specified conditions (VDD = 2.35 V to 5.25 V, fSCLK = 20 MHz). Its conversion time is fixed at 14 SCLK cycles, so actual rate scales linearly with SCLK frequency - e.g., 10 MHz SCLK yields ~714 kSPS. This rate is guaranteed across –40°C to +85°C for A-grade devices.
Does the AD7477AARM require an external voltage reference?
No, the AD7477AARM uses an internal reference derived from VDD, establishing a 0 V to VDD unipolar input range. This eliminates external reference components and simplifies layout, while maintaining ±0.5 LSB INL and 71 dB SNR performance. No external reference pins or connections are present on the AD7477AARM.
How does the AD7477AARM handle serial data formatting?
The AD7477AARM outputs 10-bit conversion results MSB-first on SDATA, prefixed with four leading zeros and suffixed with two trailing zeros - forming a consistent 16-bit frame. This format ensures compatibility with standard SPI controllers configured for 16-bit transfers, avoiding bit-shifting overhead in firmware.
What is the analog input impedance of the AD7477AARM?
The AD7477AARM exhibits 20 pF input capacitance (in track mode) and ±0.5 µA DC leakage current at VIN. For full accuracy, the driving source impedance must be ≤1 kΩ to limit settling error within 250 ns acquisition time. Higher impedances degrade INL and increase THD - especially above 10 kHz input frequencies.
Can the AD7477AARM operate from a 2.0 V supply?
The AD7477AARM is specified for 2.35 V to 5.25 V operation, but functional operation down to 2.0 V is possible with relaxed timing: VINL must remain ≤0.35 V and VINH ≥1.8 V. However, SNR degrades to 69 dB and power-down current rises to 1 µA max - so 2.0 V use is not recommended for production designs requiring full spec compliance.
AD7477AARM 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:
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7477AARM FAQ
1.How can I place an order for AD7477AARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7477AARM 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 AD7477AARM reliable?
The price and inventory of AD7477AARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7477AARM is usually 5 days.
3.What payment methods are accepted for AD7477AARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7477AARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7477AARM?
AD7477AARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7477AARM 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 AD7477AARM?
For technical support, including AD7477AARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7477AARM requirements.
6.How does Aetrix verify that AD7477AARM is sourced from the original manufacturer or authorized distributors?
All AD7477AARM 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 AD7477AARM meets industry standards.
7.What is the process for return or replacement of AD7477AARM?
All AD7477AARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7477AARM, 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 AD7477AARM part is unused and in its original packaging.
Return procedure for AD7477AARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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