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Analog Devices Inc. AD7450BRMZ
- Part No.:
- AD7450BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7450BRMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,921
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Product details
Overview
AD7450BRMZ 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 - enabling high-fidelity signal acquisition in battery-powered data loggers and motor control feedback loops.
For engineers reviewing the AD7450BRMZ datasheet, AD7450BRMZ pinout, AD7450BRMZ application, or AD7450BRMZ equivalent, this page delivers verified specifications, SOIC-8 package mapping, real-world use cases, and two validated alternative parts for transducer interface and portable instrumentation designs.
Technical Context
The AD7450BRMZ implements a charge-redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier. Its conversion is clocked directly by the SCLK input (15–18 MHz), eliminating pipeline delay and enabling precise sampling control via CS falling edge initiation.
It supports externally applied reference voltages from 100 mV to 3.5 V (5 V supply) or 2.2 V (3 V supply), with common-mode voltage range dynamically determined by VREF. Input signals are sampled differentially across VIN+ and VIN–, requiring matched source impedances to avoid settling-time mismatch errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of small-signal transducers. |
| Throughput Rate | 1 MSPS at 5 V / 833 kSPS at 3 V - enables real-time capture of fast transient events in motor control or communications systems. |
| SINAD | 70 dB min at 300 kHz input (5 V supply) - ensures >8-bit effective resolution for audio-band and sensor signals. |
| Power Dissipation | 9 mW max at 1 MSPS (5 V), 3.75 mW max at 833 kSPS (3 V) - supports thermally constrained PCB layouts in portable instruments. |
| Reference Range | VREF = 100 mV to 3.5 V (5 V supply); 100 mV to 2.2 V (3 V supply) - allows flexible input span scaling from ±100 mV to ±3.5 V differential full-scale. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.03 LSB at 100 kHz input, critical for high-SNR applications. |
| INL | ±1 LSB max (B version) - guarantees monotonicity and predictable code transitions across full temperature range (–40°C to +85°C). |
Pinout & Package
AD7450BRMZ is housed in an 8-lead SOIC package (SOIC-8, body width 3.9 mm, JEDEC MS-012). Pin spacing is 1.27 mm; thermal resistance θJA = 157°C/W.
| 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. |
| VIN+ | Positive differential analog input | Accepts signal referenced to common-mode voltage; paired with VIN– for noise-rejecting acquisition. |
| VIN– | Negative differential analog input | Complements VIN+; both inputs require matched source impedance to prevent differential settling error. |
| GND | Analog ground reference | Single-point 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 | Outputs 16-bit word: four leading zeros + 12-bit two's complement result, MSB first on SCLK falling edge. |
| SCLK | Serial clock input | Drives both data transfer and internal conversion timing; supports 4 kHz–18 MHz range (16 SCLK cycles per conversion). |
| VDD | Single power supply input | Accepts 3 V (±10%) or 5 V (±5%); requires 0.1 µF ceramic + 10 µF tantalum decoupling to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture guarantees deterministic latency: conversion completes in exactly 16 SCLK cycles with no hidden cycles or buffer dependencies. |
| Fully differential input | Rejects common-mode noise up to 90 dB (at 10 kHz), doubles dynamic range vs. single-ended, and enables flexible bias point selection via VREF. |
| Flexible power/serial clock management | Throughput rate scales linearly with SCLK frequency; power consumption drops proportionally when reducing SCLK for lower sampling rates. |
| Variable reference input | VREF adjustable from 100 mV to 3.5 V allows optimization of input range and SNR for specific sensor outputs without external gain stages. |
| Low power-down current | 1 µA max shutdown current enables microamp-level system sleep modes between burst acquisitions in battery-powered devices. |
Applications
| Transducer Interface | Battery-Powered Data Logger |
|---|---|
Use Scenario: High-precision measurement of strain gauge or RTD bridge outputs in industrial field sensors. IC Role / Device Role / Timing Role: Differential ADC capturing low-amplitude ratiometric signals while rejecting EMI-coupled common-mode noise on long cables. Use Value: 70 dB SINAD and 90 dB CMRR ensure accurate digitization of µV-level bridge imbalances without external instrumentation amplifiers. |
Use Scenario: Multi-channel environmental monitoring (temperature, humidity, pressure) in handheld field meters with 10-year battery life. 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: 3.75 mW max at 833 kSPS and 1 µA shutdown enable >5 years of operation on two AA cells with duty-cycled acquisition. |
| Motor Control Feedback | Portable Medical Instrumentation |
Use Scenario: Real-time current sensing in BLDC motor phase-leg shunt resistors for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed ADC sampling synchronized to PWM edges via CS-triggered conversion, delivering 1 MSPS current waveforms. Use Value: 20 MHz full-power bandwidth and 50 ps aperture jitter preserve harmonic content up to 10 kHz, enabling accurate torque ripple analysis. |
Use Scenario: ECG front-end digitization in handheld cardiac monitors requiring clinical-grade signal fidelity. IC Role / Device Role / Timing Role: Differential input rejects 50/60 Hz mains interference; variable VREF configures ±100 mV input range matching electrode output swing. Use Value: ±1 LSB INL and 70 dB SINAD meet AAMI EC11 requirements for diagnostic ECG amplitude accuracy and noise floor performance. |
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 |
|---|---|---|---|
| AD7451BRMZ | Same SOIC-8 package and pinout; includes internal reference (2.5 V), eliminating external VREF circuitry but fixing full-scale range. | Reduces BOM count in cost-sensitive, fixed-range systems; sacrifices VREF flexibility for simplicity. | Select AD7451BRMZ when reference stability and layout simplicity outweigh need for adjustable input span. |
| ADS7822U | 8-pin SOIC, 12-bit SAR, 200 kSPS max; uses SPI interface but lacks differential input - requires external op-amp for true differential acquisition. | Suitable for single-ended sensor interfaces where common-mode rejection is not required; lower throughput limits dynamic response. | Choose ADS7822U only for legacy single-ended designs where differential noise immunity is unnecessary and speed <200 kSPS suffices. |
Compared with AD7450BRMZ, AD7451BRMZ offers plug-and-play reference integration at the cost of input range adaptability, while ADS7822U trades differential capability and speed for lower power and simpler analog front-end requirements - making AD7450BRMZ optimal for high-fidelity, flexible-range, noise-immune acquisition.
Availability
AD7450BRMZ is available at Aetrix Electronics and suitable for transducer interface, battery-powered data acquisition, and motor control applications requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term industrial lifecycle assurance.
Supply support for AD7450BRMZ 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 AD7450BRMZ belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high speed, low power, and true differential input performance in space- and energy-constrained systems.
FAQ
What is the maximum input frequency supported by the AD7450BRMZ before signal degradation occurs?
The AD7450BRMZ has a full-power bandwidth of 20 MHz (–3 dB point) and 2.5 MHz (–0.1 dB point). At 300 kHz input frequency, it achieves 70 dB SINAD under 5 V supply conditions. Performance degrades gradually beyond 2.5 MHz due to aperture jitter and THD increase - design margins should limit sustained inputs to ≤1 MHz for >65 dB SINAD.
Can the AD7450BRMZ operate with a 2.5 V reference when powered from a 3 V supply?
Yes, the AD7450BRMZ supports VREF from 100 mV to 2.2 V when using a 3 V supply. A 2.5 V reference exceeds the 2.2 V maximum and risks violating absolute maximum ratings. For 3 V operation, use VREF ≤ 2.2 V (e.g., 1.25 V or 2.0 V) to maintain specified INL, SINAD, and reliability.
Does the AD7450BRMZ require external op-amps to drive its differential inputs?
No - the AD7450BRMZ includes an integrated differential track-and-hold amplifier capable of handling input frequencies >1 MHz. However, source impedances driving VIN+ and VIN– must be closely matched (≤1% mismatch) to prevent differential settling errors; mismatched sources may necessitate external matched-driver op-amps.
How does the AD7450BRMZ handle power-down mode entry and exit timing?
The AD7450BRMZ enters full power-down mode when CS remains high and SCLK is inactive. Power-up time from full power-down is 1 µs max. During wake-up, the internal reference and T/H amplifier stabilize before the first conversion - no additional delay is needed if CS is asserted ≥1 µs after power-up initiation.
Is the AD7450BRMZ pin-compatible with other members of the AD745x family?
Yes - AD7450BRMZ, AD7451BRMZ, and AD7452BRMZ share identical SOIC-8 pinout and footprint. The AD7451BRMZ integrates a 2.5 V reference (pin 1 = VREF_OUT), while AD7450BRMZ requires external VREF on pin 1. No PCB changes are needed when substituting within this family, provided reference routing is adapted.
AD7450BRMZ 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:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7450BRMZ FAQ
1.How can I place an order for AD7450BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7450BRMZ 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 AD7450BRMZ reliable?
The price and inventory of AD7450BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7450BRMZ is usually 5 days.
3.What payment methods are accepted for AD7450BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7450BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7450BRMZ?
AD7450BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7450BRMZ 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 AD7450BRMZ?
For technical support, including AD7450BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7450BRMZ requirements.
6.How does Aetrix verify that AD7450BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7450BRMZ 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 AD7450BRMZ meets industry standards.
7.What is the process for return or replacement of AD7450BRMZ?
All AD7450BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7450BRMZ, 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 AD7450BRMZ part is unused and in its original packaging.
Return procedure for AD7450BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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