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Analog Devices Inc. AD7450BRM
- Part No.:
- AD7450BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7450BRM.pdf
- Description:
- IC ADC 12BIT DIFF-IN 1MSPS 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,806
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Product details
Overview
AD7450BRM from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with fully differential analog input, 3 V/5 V single-supply operation, and SPI/QSPI-compatible serial interface. It features 70 dB SINAD at 300 kHz, 20 MHz full-power bandwidth, and 1 µA max power-down current - deployed in motor control feedback loops, portable instrumentation front-ends, and battery-powered data acquisition systems.
For engineers reviewing the AD7450BRM datasheet, AD7450BRM pinout, AD7450BRM application, or AD7450BRM equivalent, this page delivers verified specifications, SOIC-8 package mapping, real-world use-value per application, and two validated alternative parts for design flexibility under 3 V/5 V embedded signal conditioning constraints.
Technical Context
The AD7450BRM implements a charge-redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier (T/H) featuring 20 MHz –3 dB bandwidth and 50 ps aperture jitter. Its conversion timing is fully synchronized to the external SCLK, eliminating pipeline delay and enabling precise sampling control via CS falling edge.
It operates with externally applied reference voltage (100 mV–3.5 V), where VREF directly sets both full-scale span (±VREF differential) and common-mode range (CM = VREF typical). Input coding is two's complement, and serial output delivers four leading zeros followed by 12 MSB-first data bits on SDATA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete codes for high-fidelity sensor or transducer digitization |
| Throughput Rate | 1 MSPS at 5 V / 833 kSPS at 3 V - supports real-time closed-loop control and burst-mode acquisition |
| SINAD | 70 dB min at 300 kHz input - ensures ≥8.6 ENOB for precision measurement applications |
| Power Dissipation | 9 mW max at 1 MSPS (5 V) / 3.75 mW max at 833 kSPS (3 V) - enables thermally constrained portable designs |
| Reference Range | VREF = 100 mV to 3.5 V (5 V supply) or 2.2 V (3 V supply) - allows flexible input scaling and bias point selection |
| Aperture Jitter | 50 ps typ - limits SNR degradation at high input frequencies (e.g., >100 kHz) |
| INL | ±1 LSB max (B version) - guarantees monotonicity and <0.025% full-scale linearity error |
Pinout & Package
AD7450BRM is housed in an 8-lead SOIC package (SOIC-8, body size 3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | External reference input | Defines full-scale differential span (±VREF) and sets common-mode operating point; requires ≥0.1 µF decoupling |
| VIN+ | Differential analog input (+) | Accepts signal referenced to VIN–; input capacitance = 20 pF (track), 6 pF (hold) |
| VIN– | Differential analog input (–) | Completes differential pair; matched source impedance critical to avoid settling errors |
| GND | Analog ground reference | Common return for all analog circuitry; must be isolated from digital ground to minimize noise coupling |
| CS | Active-low chip select | Initiates conversion on falling edge and frames serial data transfer; minimum pulse width = 10 ns |
| SDATA | Serial data output | Three-state, MSB-first 12-bit result preceded by four leading zeros; output coding = two's complement |
| SCLK | Serial clock input | Drives both data readout and internal conversion timing; max frequency = 18 MHz (5 V), 15 MHz (3 V) |
| VDD | Single power supply | Accepts 3 V ±10% or 5 V ±5%; requires 0.1 µF ceramic + 10 µF tantalum decoupling |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture guarantees deterministic, single-cycle conversion latency - essential for time-critical control loops |
| Fully differential input | Rejects common-mode noise and doubles dynamic range vs. single-ended inputs; supports bipolar signal acquisition |
| Flexible reference scaling | VREF programmable from 100 mV to 3.5 V enables optimized SNR across varying sensor output ranges |
| Low-power shutdown mode | 1 µA max quiescent current extends battery life in intermittent-sampling applications like portable meters |
| High-speed serial interface | SPI/QSPI/MICROWIRE compatibility simplifies integration with ARM Cortex-M, DSP, and FPGA host controllers |
Applications
| Motor Control Feedback | Portable Instrumentation |
|---|---|
Use Scenario: Sampling current/voltage in BLDC motor phase legs for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing synchronized current waveforms at ≥20 kHz PWM switching rates. Use Value: 1 MSPS throughput and 50 ps aperture jitter preserve phase accuracy for torque ripple reduction and efficient commutation. |
Use Scenario: Digitizing sensor outputs (e.g., strain gauge, thermocouple) in handheld multimeters or environmental loggers. IC Role / Device Role / Timing Role: Precision front-end converter with configurable VREF and low 3.75 mW active power at 3 V. Use Value: Differential input rejects EMI from shared PCB traces; shutdown mode extends battery runtime beyond 100 hours. |
| Data Acquisition Systems | Battery-Powered Systems |
Use Scenario: Multi-channel industrial DAQ modules acquiring vibration, pressure, or acoustic signals. IC Role / Device Role / Timing Role: Standalone 12-bit converter interfacing to microcontroller via SPI, supporting up to 1 MSPS per channel. Use Value: 70 dB SINAD at 300 kHz and 20 MHz input bandwidth enable accurate spectral analysis of mechanical resonance signatures. |
Use Scenario: Low-power IoT edge nodes performing periodic sensor reads (e.g., gas detection, water quality monitoring). IC Role / Device Role / Timing Role: Energy-efficient ADC entering 1 µA shutdown between triggered conversions. Use Value: 3.75 mW operational power at 833 kSPS and 1 µA shutdown current reduce average system power to <100 µW in duty-cycled operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7451BRM | Same SOIC-8 package and pinout; higher 1.25 MSPS max throughput; identical VREF range and differential input structure | Preferred for systems requiring margin above 1 MSPS or tighter timing budgets | Select AD7451BRM when >1 MSPS sustained sampling is required without changing layout or firmware interface logic |
| ADS7822U | 8-pin SOIC, 12-bit SAR, but single-ended input only; 200 kSPS max; 2.7–5.25 V supply; no VREF pin (internal reference) | Suitable for cost-sensitive, lower-speed applications where differential noise rejection is not mandatory | Choose ADS7822U only if system design tolerates single-ended inputs and reduced speed - not drop-in compatible due to pin function and reference architecture differences |
Compared with AD7450BRM, AD7451BRM offers higher throughput with identical footprint and interface, while ADS7822U trades differential performance and speed for lower cost and simpler biasing - making AD7450BRM the optimal balance of precision, speed, and power in noise-sensitive 3 V/5 V embedded systems.
Availability
AD7450BRM is available at Aetrix Electronics and suitable for motor control feedback, portable instrumentation, and battery-powered data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7450BRM 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7450BRM belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, differential-input signal acquisition in resource-constrained embedded systems.
FAQ
What is the maximum input frequency supported by the AD7450BRM before SINAD degrades below 70 dB?
The AD7450BRM maintains ≥70 dB SINAD up to 300 kHz input frequency under specified conditions (VDD = 5 V, fS = 1 MSPS, VREF = 2.5 V). At 500 kHz, SINAD drops to ~67 dB per TPC 3; the full-power bandwidth is 20 MHz (–3 dB), but usable dynamic performance is constrained by harmonic distortion above 300 kHz. For AD7450BRM designs targeting 70+ dB SINAD, keep analog input content below 300 kHz.
Can the AD7450BRM operate with a 2.5 V reference when powered from a 3 V supply?
Yes - the AD7450BRM supports VREF from 100 mV up to 2.2 V when VDD = 3 V. A 2.5 V reference exceeds this limit and risks violating absolute maximum ratings (VREF must not exceed VDD + 0.3 V, and functional range is capped at 2.2 V for 3 V operation). Using 2.5 V with 3 V supply may cause incorrect code transitions or damage; instead, use 1.25 V (for ±1.25 V span) or up to 2.2 V (for ±2.2 V span) with AD7450BRM.
Does the AD7450BRM require external anti-aliasing filtering?
Yes - while the AD7450BRM's 20 MHz full-power bandwidth permits high-frequency input, its Nyquist frequency at 1 MSPS is 500 kHz. To prevent aliasing of out-of-band noise or harmonics into the baseband, a sharp cutoff anti-aliasing filter (e.g., 5-pole elliptic, –3 dB at 400 kHz) is recommended before the VIN+/VIN– inputs. The AD7450BRM's 20 pF input capacitance in track mode also interacts with series resistance, affecting settling - RC filtering must be co-designed with driver capability.
How does the AD7450BRM handle common-mode voltage variations during conversion?
The AD7450BRM accepts a wide common-mode range (e.g., 0.625 V to 4.42 V at VREF = 1.25 V, VDD = 5 V), but CM must remain stable within ±0.5 LSB during acquisition. Its differential T/H samples on the CS falling edge and holds for 200 ns (max), so external circuitry must settle CM to within 1 mV before CS assertion. CM drift >1 mV during hold causes gain/offset errors - verified in AD7450BRM TPC 12 showing zero-code error shift vs. VREF and CM.
Is the AD7450BRM pin-compatible with the AD7450ARM or AD7450CRM variants?
Yes - AD7450BRM, AD7450ARM, and AD7450CRM share identical SOIC-8 pinout, electrical interface, and functional behavior. Differences are limited to grade-specific AC/DC specs: AD7450BRM (B-grade) guarantees ±1 LSB INL and ±1 LSB DNL, while AD7450ARM (A-grade) specifies ±2 LSB INL. All three use the same PCB footprint, schematic symbol, and firmware driver - AD7450BRM is the highest-precision variant in the AD7450 family.
AD7450BRM 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:
- 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:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7450BRM FAQ
1.How can I place an order for AD7450BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7450BRM 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 AD7450BRM reliable?
The price and inventory of AD7450BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7450BRM is usually 5 days.
3.What payment methods are accepted for AD7450BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7450BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7450BRM?
AD7450BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7450BRM 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 AD7450BRM?
For technical support, including AD7450BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7450BRM requirements.
6.How does Aetrix verify that AD7450BRM is sourced from the original manufacturer or authorized distributors?
All AD7450BRM 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 AD7450BRM meets industry standards.
7.What is the process for return or replacement of AD7450BRM?
All AD7450BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD7450BRM, 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 AD7450BRM part is unused and in its original packaging.
Return procedure for AD7450BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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