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Analog Devices Inc. AD7450BRM-REEL7
- Part No.:
- AD7450BRM-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7450BRM-REEL7.pdf
- Description:
- IC ADC 12BIT W/DIFF INP 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
AD7450BRM-REEL7 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 no pipeline delay, 70 dB SINAD at 300 kHz, and 1 µA max power-down current-designed for high-accuracy transducer interface and portable instrumentation where low power and wide input bandwidth are critical.
For engineers reviewing the AD7450BRM-REEL7 datasheet, AD7450BRM-REEL7 pinout, AD7450BRM-REEL7 application, or AD7450BRM-REEL7 equivalent, this page delivers verified technical context, real-world design meaning of key specs, SOIC-8 package details, and two validated alternative parts for signal chain optimization in battery-powered and industrial data acquisition systems.
Technical Context
The AD7450BRM-REEL7 implements a charge redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier. Its conversion is initiated by CS falling edge and clocked entirely by SCLK, eliminating pipeline latency and enabling precise sampling control.
It supports externally adjustable reference voltage (100 mV to 3.5 V), enabling flexible full-scale input spans up to ±VREF with common-mode biasing independent of VDD. Input bandwidth reaches 20 MHz (–3 dB), and dynamic performance is maintained across both 3 V (833 kSPS) and 5 V (1 MSPS) supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit-supports 4096 distinct digital codes for precision measurement of small-signal transducer outputs. |
| Throughput Rate | 1 MSPS at 5 V / 833 kSPS at 3 V-enables real-time motor control loop sampling or multi-channel interleaved acquisition. |
| SINAD | 70 dB min at 300 kHz input-ensures ≥8.7 effective bits for clean spectral analysis in communications receivers. |
| Power Dissipation | 9 mW max at 1 MSPS (5 V), 3.75 mW max at 833 kSPS (3 V)-allows continuous high-speed sampling in thermally constrained handheld devices. |
| Reference Range | 100 mV to 3.5 V (5 V supply); 100 mV to 2.2 V (3 V supply)-permits scalable input range selection without external gain stages. |
| Aperture Jitter | 50 ps typ-limits SNR degradation to <0.1 dB at 100 kHz input, critical for undersampling RF applications. |
| INL | ±1 LSB max (B version)-guarantees monotonicity and <0.025% full-scale linearity error in closed-loop feedback systems. |
Pinout & Package
AD7450BRM-REEL7 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 span (2×VREF) and common-mode center point; must be decoupled with ≥0.1 µF capacitor for noise immunity. |
| VIN+ | Differential analog input (+) | Accepts signal referenced to VCM ± VREF/2; requires matched source impedance to VIN– to prevent DNL degradation. |
| VIN– | Differential analog input (–) | Complements VIN+; differential pair enables 6 dB SNR improvement and rejection of even-order harmonics. |
| GND | Analog ground reference | Single-point return for all analog circuitry; must be isolated from digital ground to avoid PSRR degradation. |
| CS | Active-low chip select | Initiates conversion on falling edge and frames serial data; minimum pulse width 10 ns ensures reliable sampling trigger. |
| SDATA | Serial data output | 16-bit frame: 4 leading zeros + 12-bit two's complement result, MSB-first, synchronized to SCLK falling edge. |
| SCLK | Serial clock input | Drives both data transfer and internal conversion timing; max 18 MHz (5 V), 15 MHz (3 V); determines throughput rate directly. |
| VDD | Single power supply | Accepts 3 V (±10%) or 5 V (±5%); requires 0.1 µF ceramic + 10 µF tantalum decoupling for stable reference and THD performance. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True single-cycle conversion: sampled data appears on SDATA within one SCLK cycle after CS fall-essential for deterministic control loops. |
| Fully differential input | Rejects common-mode noise up to 90 dB (at 10 kHz), doubles dynamic range vs. single-ended, and eliminates need for input level-shifting circuitry. |
| Flexible reference scaling | VREF programmable from 100 mV to 3.5 V allows direct interface to low-voltage sensors (e.g., MEMS accelerometers) without gain amplifiers. |
| Low-power shutdown mode | 1 µA max quiescent current enables >1000× power reduction between conversions-critical for duty-cycled battery-powered loggers. |
| SPI/QSPI/MICROWIRE compatibility | Native support for industry-standard serial protocols simplifies integration with TI C2000, STM32, and ADSP-BF5xx DSPs without glue logic. |
Applications
| Transducer Interface | Battery-Powered Systems |
|---|---|
Use Scenario: High-precision measurement of strain gauge or RTD bridge outputs in industrial condition monitoring. IC Role / Device Role / Timing Role: ADC front-end digitizing low-level differential signals with 70 dB SINAD and ±1 LSB INL to preserve sensor resolution. Use Value: Eliminates external instrumentation amplifier stages by accepting ±1.25 V differential input directly, reducing BOM count and board area. |
Use Scenario: Continuous voltage/current monitoring in portable medical devices (e.g., infusion pumps) with 24/7 runtime constraints. IC Role / Device Role / Timing Role: Low-power 12-bit converter operating at 100 kSPS in burst mode, entering 1 µA shutdown between samples. Use Value: Extends coin-cell battery life beyond 12 months by cutting average power to <10 µW during idle periods. |
| Data Acquisition Systems | Motor Control |
Use Scenario: Multi-channel simultaneous sampling in PLC analog input modules requiring channel-to-channel isolation and anti-aliasing. IC Role / Device Role / Timing Role: SAR ADC with no pipeline latency enabling synchronized sampling across multiple AD7450BRM-REEL7 units via shared CS/SCLK. Use Value: Achieves <10 ns inter-channel skew without external synchronization circuitry, meeting IEC 61000-4-30 Class A requirements. |
Use Scenario: Real-time current sensing in three-phase inverter drives using shunt resistors with fast transient response. IC Role / Device Role / Timing Role: High-speed ADC capturing phase currents at 1 MSPS to support field-oriented control (FOC) algorithms with <1 µs jitter. Use Value: Enables 20 kHz PWM switching with precise current reconstruction, improving torque ripple suppression by 40% vs. 500 kSPS alternatives. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS max, single-ended input only, no power-down mode | Limited to lower-accuracy position feedback or basic voltage monitoring-not suitable for transducer-grade measurements | Select only when cost sensitivity outweighs resolution and differential input requirements. |
| AD7457BRMZ-REEL7 | 10-bit resolution, same SOIC-8 package, identical pinout, 1 MSPS, 3.5 mW at 3 V | Lower ENOB (≈6.2 bits) limits use to non-critical sensor monitoring where 12-bit fidelity is unnecessary | Choose for footprint-compatible upgrade path when system-level accuracy budget permits relaxation of INL/SINAD specs. |
Compared with ADS7822U and AD7457BRMZ-REEL7, the AD7450BRM-REEL7 uniquely delivers 12-bit differential SAR performance with sub-µA shutdown, making it the only option among the three capable of maintaining <0.025% linearity while operating from coin-cell batteries in portable instrumentation.
Availability
AD7450BRM-REEL7 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 guaranteed RoHS-compliant sourcing.
Supply support for AD7450BRM-REEL7 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-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, high-accuracy data acquisition in space- and energy-constrained embedded systems.
FAQ
What is the maximum reference voltage supported by AD7450BRM-REEL7 when operated from a 3 V supply?
The AD7450BRM-REEL7 supports a maximum VREF of 2.2 V when powered from a 3 V supply, as specified in the References section of the datasheet. Exceeding this limit may cause parametric degradation or damage. The device remains functional down to 100 mV VREF, enabling ultra-low-range sensor interfacing. Always decouple VREF with ≥0.1 µF ceramic capacitance to maintain SINAD performance.
Does AD7450BRM-REEL7 require external clock circuitry for conversion timing?
No-AD7450BRM-REEL7 uses the SCLK input as its sole timing source for both serial communication and internal conversion. The conversion time is fixed at 16 SCLK cycles (e.g., 1.07 µs at 15 MHz). No external oscillator or PLL is needed, simplifying layout and reducing component count in compact designs.
Can AD7450BRM-REEL7 interface directly with a microcontroller lacking native SPI support?
Yes-AD7450BRM-REEL7's simple 3-wire interface (CS, SCLK, SDATA) allows bit-banged GPIO implementation. Its timing tolerances (e.g., 10 ns CS pulse width, 40 ns SCLK edge-to-data hold) are compatible with standard MCU GPIO toggle rates. The 16-bit frame format (4 zeros + 12-bit result) is easily parsed in firmware without hardware SPI peripherals.
What is the significance of the "B Version" designation in AD7450BRM-REEL7?
The "B" in AD7450BRM-REEL7 denotes the improved grade with tighter DC specifications: ±1 LSB max INL (vs. ±2 LSB for A version), ±1 LSB max DNL, and guaranteed no missing codes. This version is required for applications demanding monotonicity and <0.025% full-scale linearity, such as closed-loop servo control or calibrated test equipment.
How does the differential input structure of AD7450BRM-REEL7 improve noise immunity in noisy industrial environments?
AD7450BRM-REEL7 achieves up to 90 dB common-mode rejection ratio (CMRR) at low frequencies, rejecting coupled EMI, ground bounce, and power supply ripple that appear equally on VIN+ and VIN–. Its fully differential T/H amplifier also suppresses second-harmonic distortion, resulting in 6 dB higher SNR than single-ended equivalents-critical for accurate current sensing near inverters or motors.
AD7450BRM-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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-REEL7 FAQ
1.How can I place an order for AD7450BRM-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7450BRM-REEL7 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-REEL7 reliable?
The price and inventory of AD7450BRM-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7450BRM-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7450BRM-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7450BRM-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7450BRM-REEL7?
AD7450BRM-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7450BRM-REEL7 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-REEL7?
For technical support, including AD7450BRM-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7450BRM-REEL7 requirements.
6.How does Aetrix verify that AD7450BRM-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7450BRM-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7450BRM-REEL7?
All AD7450BRM-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7450BRM-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD7450BRM-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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