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Analog Devices Inc. AD7450ABRT-R2
- Part No.:
- AD7450ABRT-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7450ABRT-R2.pdf
- Description:
- IC ADC 12BIT W/DIFF INP SOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
AD7450ABRT-R2 from Analog Devices is a 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with fully differential analog inputs, operating from single 3 V or 5 V supplies. It delivers 70 dB minimum SINAD at 100 kHz input frequency, ±1 LSB INL max, and supports flexible external reference voltages from 100 mV to 3.5 V. It is used in high-precision, low-power data acquisition systems requiring accurate differential signal digitization.
For engineers reviewing the AD7450ABRT-R2 datasheet, AD7450ABRT-R2 pinout, AD7450ABRT-R2 application, or AD7450ABRT-R2 equivalent, key selection criteria include its 12-bit resolution, 1 MSPS throughput with no pipeline delay, differential input architecture, SPI-compatible serial interface, and 8-lead SOT-23 package compatibility with space-constrained embedded designs.
Technical Context
The AD7450ABRT-R2 implements a SAR architecture with a low-noise, wide-bandwidth differential track-and-hold amplifier capable of handling input frequencies up to 3.5 MHz. Its conversion is initiated on the falling edge of CS, and data is clocked out MSB-first with four leading zeros, ensuring deterministic timing and zero latency.
It features a variable external reference input (VREF), enabling user-defined full-scale spans (2 × VREF) and common-mode biasing. Power management includes a full power-down mode drawing ≤1 μA, and dynamic power scaling via serial clock rate adjustment-no separate control logic or external timing circuitry required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - provides 4096 discrete output codes for high-fidelity signal representation in precision measurement. |
| Throughput Rate | 1 MSPS - enables real-time sampling of fast transients in motor control and instrumentation without buffering. |
| SINAD @ 100 kHz | 70 dB min - ensures ≥8.3 effective bits (ENOB) for clean digitization of medium-frequency sensor signals. |
| INL | ±1 LSB max - guarantees monotonicity and linearity critical for closed-loop feedback accuracy. |
| Power Dissipation @ 1 MSPS | 4 mW max (3 V), 9.25 mW max (5 V) - supports battery-powered operation with minimal thermal impact in compact enclosures. |
| Reference Range | 100 mV to 3.5 V - allows scalable input ranges (e.g., ±100 mV to ±3.5 V differential) without external gain stages. |
| Package | 8-lead SOT-23 - surface-mount footprint (2.8 mm × 2.9 mm) suitable for dense PCB layouts and portable devices. |
Pinout & Package
The AD7450ABRT-R2 is housed in an 8-lead SOT-23 package with exposed pad (RoHS-compliant, moisture sensitivity level 1). Pin 1 is marked by a dot; device orientation follows JEDEC MO-178BA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | External reference voltage input | Defines full-scale differential input span (2 × VREF); must be decoupled with ≥0.1 µF capacitor to GND for noise immunity. |
| VIN+ | Differential analog input positive terminal | Accepts signal referenced to VCM = VREF; supports rail-to-rail common-mode range when VREF is set appropriately. |
| VIN– | Differential analog input negative terminal | Complements VIN+ for true differential acquisition; rejects common-mode noise up to CMRR >70 dB at 100 kHz. |
| GND | Analog ground reference | Single-point return for all analog circuitry; must be isolated from digital ground to prevent coupling errors. |
| CS | Active-low chip select | Initiates conversion on falling edge and frames serial data transfer; enables multi-device SPI bus sharing. |
| SDATA | Serial data output | Provides 12-bit twos-complement result MSB-first, preceded by four leading zeros; tri-states when CS is high. |
| SCLK | Serial clock input | Controls conversion timing and data readout; supports up to 18 MHz clock rate for 1 MSPS operation. |
| VDD | Power supply input | Accepts 2.7–3.6 V or 4.75–5.25 V; requires parallel 0.1 µF ceramic + 10 µF tantalum decoupling for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture ensures immediate conversion completion after CS assertion-critical for time-critical control loops. |
| Fully differential input | Rejects common-mode noise and doubles effective input swing versus single-ended ADCs, improving SNR in noisy environments. |
| Flexible reference scaling | VREF adjustable from 100 mV to 3.5 V enables direct interfacing with low-level sensors (e.g., strain gauges) or high-voltage signals via scaling resistors. |
| Low-power shutdown mode | 1 μA max current draw in full power-down extends battery life in intermittent-sampling applications like wireless sensor nodes. |
| SPI/QSPI/MICROWIRE/DSP compatible | Standard serial interface eliminates need for custom logic or protocol translation-reduces firmware development effort. |
Applications
| Transducer Interface | Battery-Powered Systems |
|---|---|
Use Scenario: Digitizing low-amplitude differential outputs from load cells, RTDs, or bridge-based pressure sensors in industrial field instruments. IC Role / Device Role / Timing Role: High-accuracy SAR ADC performing synchronized sampling with precise aperture control via CS-triggered acquisition. Use Value: 12-bit resolution and ±1 LSB INL enable sub-0.1% measurement accuracy; differential input rejects EMI-induced common-mode offsets from long sensor cables. |
Use Scenario: Monitoring battery voltage, temperature, and current in portable medical devices or handheld test equipment with strict power budgets. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at configurable rates (10 kSPS–1 MSPS) while minimizing active time via SCLK-gated throughput control. Use Value: 4 mW max dissipation at 3 V/1 MSPS and 1 μA shutdown current extend operational runtime; small SOT-23 footprint saves board space. |
| Data Acquisition Systems | Motor Control |
Use Scenario: High-channel-count DAQ modules capturing synchronized analog waveforms from multiple sensors in lab-grade equipment. IC Role / Device Role / Timing Role: Precision ADC providing deterministic 1 MSPS sampling with no latency or pipeline artifacts across channels. Use Value: 70 dB SINAD at 100 kHz preserves signal integrity for FFT-based spectral analysis; SPI interface simplifies FPGA or microcontroller integration. |
Use Scenario: Sampling phase currents and DC bus voltage in three-phase inverter drives for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Fast SAR ADC delivering timely current feedback with <888 ns conversion time to support high-bandwidth current loops. Use Value: Differential input handles high dv/dt noise near IGBTs; 1 MSPS rate enables >10 kHz control loop bandwidth with oversampling capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7450BRMZ-REEL | Same 12-bit/1 MSPS specs but in 10-lead MSOP package; slightly higher thermal resistance (θJA = 205.9°C/W vs. 211.5°C/W). | Preferred where board layout allows larger footprint and improved thermal performance is needed for sustained high-throughput operation. | Select AD7450BRMZ-REEL if MSOP's larger pad area improves solder joint reliability or thermal dissipation in thermally constrained assemblies. |
| ADS7822U | 12-bit, 250 kSPS (vs. 1 MSPS); single-supply 2.7–5.5 V; uses SPI but lacks differential input-requires external instrumentation amplifier. | Suitable for lower-speed, cost-sensitive applications where differential front-end can be added externally and throughput <250 kSPS suffices. | Choose ADS7822U only when system throughput requirements are ≤250 kSPS and design can accommodate external signal conditioning for differential signals. |
Compared with AD7450BRMZ-REEL, the AD7450ABRT-R2 offers identical electrical performance in a smaller SOT-23 package-ideal for space-limited designs-but with marginally higher junction temperature rise under continuous 1 MSPS operation. Versus ADS7822U, AD7450ABRT-R2 delivers 4× higher throughput and integrated differential input, eliminating external amplifiers and reducing BOM count and layout complexity.
Availability
AD7450ABRT-R2 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and motor control applications requiring stable component supply, long-term production continuity, and RoHS-compliant sourcing.
Supply support for AD7450ABRT-R2 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 AD7450A product line delivers precision, low-power SAR ADCs optimized for space-constrained, battery-aware, and noise-sensitive applications including portable instrumentation and industrial sensing.
FAQ
What is the maximum sampling rate supported by the AD7450ABRT-R2?
The AD7450ABRT-R2 supports a maximum throughput rate of 1 MSPS (1 million samples per second), achieved using an 18 MHz serial clock and completing conversion in 16 SCLK cycles (888 ns). This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) and both 3 V and 5 V supply conditions.
Does the AD7450ABRT-R2 require an external reference voltage?
Yes, the AD7450ABRT-R2 requires an external reference voltage applied to the VREF pin. The reference can range from 100 mV to 3.5 V depending on the supply voltage (2.06 V typical for 3 V operation, 2.55 V for 5 V), and directly sets the full-scale differential input span as 2 × VREF. No internal reference is provided.
Is the AD7450ABRT-R2 compatible with standard SPI interfaces?
Yes, the AD7450ABRT-R2 is fully compatible with SPI, QSPI, MICROWIRE, and DSP serial interfaces. It uses a simple 3-wire interface (CS, SCLK, SDATA), accepts standard clock polarity and phase configurations, and outputs data MSB-first with four leading zeros-requiring no protocol translation in standard microcontroller implementations.
What is the meaning of "fully differential analog input" in the AD7450ABRT-R2?
The AD7450ABRT-R2 accepts true differential signals between VIN+ and VIN–, rejecting common-mode noise and enabling bipolar input ranges centered on VREF. This architecture eliminates the need for external instrumentation amplifiers in many sensor applications and improves noise immunity compared to pseudo-differential or single-ended ADCs.
How does power consumption scale with throughput in the AD7450ABRT-R2?
Power consumption in the AD7450ABRT-R2 scales linearly with throughput: at 100 kSPS it draws ~0.6 mW (3 V) or ~1.55 mW (5 V), rising to 4 mW (3 V) or 9.25 mW (5 V) at 1 MSPS. Reducing SCLK frequency proportionally lowers IDD, and full power-down mode reduces current to ≤1 μA-enabling adaptive power management.
AD7450ABRT-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Cut Tape (CT)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7450ABRT-R2 FAQ
1.How can I place an order for AD7450ABRT-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7450ABRT-R2 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 AD7450ABRT-R2 reliable?
The price and inventory of AD7450ABRT-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7450ABRT-R2 is usually 5 days.
3.What payment methods are accepted for AD7450ABRT-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7450ABRT-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7450ABRT-R2?
AD7450ABRT-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7450ABRT-R2 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 AD7450ABRT-R2?
For technical support, including AD7450ABRT-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7450ABRT-R2 requirements.
6.How does Aetrix verify that AD7450ABRT-R2 is sourced from the original manufacturer or authorized distributors?
All AD7450ABRT-R2 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 AD7450ABRT-R2 meets industry standards.
7.What is the process for return or replacement of AD7450ABRT-R2?
All AD7450ABRT-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7450ABRT-R2, 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 AD7450ABRT-R2 part is unused and in its original packaging.
Return procedure for AD7450ABRT-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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