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Analog Devices Inc. AD7451BRMZ
- Part No.:
- AD7451BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7451BRMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
AD7451BRMZ from Analog Devices is a 12-bit, 1 MSPS pseudo-differential successive approximation ADC operating from a single 2.7 V to 5.25 V supply. It features 70 dB SINAD at 100 kHz input, ±1 LSB INL (B version), and SPI-/QSPI-/MICROWIRE-compatible serial interface - deployed in portable instrumentation for high-fidelity sensor digitization.
For engineers reviewing the AD7451BRMZ datasheet, AD7451BRMZ pinout, AD7451BRMZ application, or AD7451BRMZ equivalent, this page delivers verified technical context, package-validated pin functions, real-world use-value mapping, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The AD7451BRMZ implements a SAR architecture with dual capacitive DACs and a differential track-and-hold amplifier supporting up to 3.5 MHz analog input bandwidth. Its conversion is initiated by the falling edge of CS and clocked by SCLK, eliminating pipeline delay.
It uses an external reference (100 mV to VDD) applied to VREF, supports straight binary output coding, and achieves 888 ns conversion time at 18 MHz SCLK. Power-down mode draws ≤1 μA, enabling battery-conscious system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise amplitude quantization. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to 500 kHz Nyquist bandwidth. |
| SINAD | 70 dB at 100 kHz - ensures ≥11.3 effective bits for clean signal reconstruction in noisy environments. |
| INL (B version) | ±1 LSB max - guarantees monotonicity and linearity critical for closed-loop control feedback. |
| Power Dissipation | 4 mW at 3 V / 1 MSPS - enables continuous high-speed acquisition in thermally constrained handheld devices. |
| Reference Range | 100 mV to VDD - allows flexible scaling from low-voltage sensors to full-supply-rail inputs. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP-compatible - simplifies integration with common microcontrollers without protocol translation. |
Pinout & Package
AD7451BRMZ is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with thermal impedance θJC = 91.99°C/W and θJA = 211.5°C/W. Pin functions are validated per Analog Devices Rev. D datasheet Figures 6 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting analog input | Accepts single-ended or pseudo-differential signal referenced to VIN–; full-scale span = VREF. |
| VIN– | Inverting analog input | Provides pseudo ground reference; typically biased at dc offset (e.g., 0.1–0.4 V) to enable single-ended input operation. |
| GND | Analog ground | Common return for analog inputs, reference, and internal circuitry; must be star-connected to minimize noise coupling. |
| VREF | External reference input | Defines full-scale range; requires ≥0.1 μF decoupling capacitor to suppress noise-induced gain error. |
| VDD | Power supply | 2.7 V to 5.25 V single supply; requires 0.1 μF + 10 μF tantalum decoupling per datasheet layout guidelines. |
| CS | Chip select (active low) | Initiates conversion on falling edge and frames serial data transfer; enables multi-device SPI bus sharing. |
| SCLK | Serial clock input | Drives both data readout and internal SAR conversion timing; max 18 MHz supports 1 MSPS throughput. |
| SDATA | Serial data output | 3-state output delivering 4 leading zeros + 12-bit result MSB-first; compatible with standard SPI master receivers. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture ensures deterministic 16-SCLK-cycle latency - essential for time-critical control loops. |
| Pseudo-differential input | VIN– biasing enables true single-ended signal acquisition while rejecting common-mode noise on VIN+. |
| Flexible power management | Power-down mode reduces current to ≤1 μA; serial clock speed directly scales power vs. throughput trade-off. |
| Wide supply range | 2.7 V to 5.25 V operation supports direct interfacing with Li-ion, 3.3 V, and 5 V systems without level-shifting. |
| High input bandwidth | 2.5 MHz @ −0.1 dB full-power bandwidth allows accurate digitization of fast transients and wideband sensors. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature with 12-bit resolution and <1 ms update rate. IC Role / Device Role / Timing Role: Primary ADC digitizing front-end sensor outputs; CS-triggered conversions synchronized to display refresh cycle. Use Value: 70 dB SINAD preserves signal fidelity across 100 kHz bandwidth, while 4 mW power at 3 V extends battery life beyond 24 hours. |
Use Scenario: Remote environmental sensor node logging temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during measurement bursts; power-down mode maintains 1 μA quiescent draw between samples. Use Value: External VREF scaling (e.g., 1.25 V) enables optimal dynamic range for low-output sensors, minimizing post-processing gain error. |
| Transducer Interface Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Strain-gauge bridge amplifier output digitized in compact load-cell interface PCB with minimal BOM count. IC Role / Device Role / Timing Role: Pseudo-differential input accepts bridge output referenced to mid-supply; VIN– biased to match common-mode voltage. Use Value: ±1 LSB INL ensures <0.025% full-scale linearity error - critical for calibration traceability in metrology-grade modules. |
Use Scenario: 4–20 mA loop-powered transmitter digitizing RTD or thermocouple signals in harsh factory environments. IC Role / Device Role / Timing Role: ADC referenced to stable 2.5 V shunt; SPI interface isolated via digital isolator for noise immunity. Use Value: 70 dB PSRR at 100 kHz suppresses switching noise from DC/DC converters, preventing measurement corruption in shared power domains. |
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 |
|---|---|---|---|
| AD7450BRMZ | 10-bit resolution, same 1 MSPS rate, identical SOT-23 package and pinout. | Limited to lower-precision applications where ENOB < 10 bits suffices (e.g., basic threshold detection). | Select AD7450BRMZ when cost sensitivity outweighs resolution requirements and system SNR budget permits ≤61 dB SINAD. |
| ADS7822U | 12-bit, 250 kSPS max, 8-pin SOIC package, SPI-compatible but no power-down mode. | Lower throughput and fixed 5 V supply only; lacks ultra-low-power sleep state for intermittent sampling. | Choose ADS7822U only if legacy 5 V systems require drop-in replacement and 1 MSPS is not required. |
Compared with AD7451BRMZ, AD7450BRMZ trades 2 bits of resolution for lower cost and same footprint, while ADS7822U sacrifices speed and power efficiency for broader vendor availability - neither offers pin-to-pin compatibility or identical dynamic performance.
Availability
AD7451BRMZ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, transducer interface modules, and industrial sensor signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for AD7451BRMZ 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.
The AD7451BRMZ belongs to the AD7441/AD7451 family of low-power, high-speed SAR ADCs designed specifically for space-constrained, battery-sensitive applications demanding precision without pipeline latency.
FAQ
What is the maximum sampling frequency supported by the AD7451BRMZ?
The AD7451BRMZ supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock and 16 SCLK cycles per conversion. This corresponds to a Nyquist-limited analog input bandwidth of 500 kHz. The device maintains specified AC performance (e.g., 70 dB SINAD) up to 100 kHz input frequency, with full-power bandwidth rated at 2.5 MHz @ −0.1 dB.
Does the AD7451BRMZ require an external reference voltage?
Yes, the AD7451BRMZ requires an external reference voltage applied to the VREF pin. It operates with VREF ranging from 100 mV to VDD, and the typical specified value is 2.5 V. The reference must be decoupled with at least a 0.1 μF capacitor to GND to ensure stable full-scale accuracy and minimize noise-induced gain error.
What package type is used for the AD7451BRMZ?
The AD7451BRMZ uses an 8-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm. This compact outline is optimized for space-constrained PCB layouts in portable equipment. Thermal characteristics include θJA = 211.5°C/W and θJC = 91.99°C/W, confirming suitability for low-power, naturally cooled applications.
How does the pseudo-differential input of the AD7451BRMZ work in practice?
The AD7451BRMZ pseudo-differential input uses VIN+ and VIN– terminals: VIN+ carries the signal, while VIN– is biased at a small dc voltage (e.g., 0.1–0.4 V) to establish a local pseudo-ground reference. This configuration rejects common-mode noise on VIN+ and enables true single-ended signal acquisition without requiring a differential driver stage.
Is the AD7451BRMZ compatible with standard SPI interfaces?
Yes, the AD7451BRMZ features an SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It uses CS (active-low chip select), SCLK (serial clock), and SDATA (3-state serial data output). Data is clocked out MSB-first with four leading zeros followed by 12 bits, matching standard SPI frame timing and allowing direct connection to most microcontroller SPI peripherals without glue logic.
AD7451BRMZ 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:
- Pseudo-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:
- -
AD7451BRMZ FAQ
1.How can I place an order for AD7451BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7451BRMZ 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 AD7451BRMZ reliable?
The price and inventory of AD7451BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7451BRMZ is usually 5 days.
3.What payment methods are accepted for AD7451BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7451BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7451BRMZ?
AD7451BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7451BRMZ 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 AD7451BRMZ?
For technical support, including AD7451BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7451BRMZ requirements.
6.How does Aetrix verify that AD7451BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7451BRMZ 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 AD7451BRMZ meets industry standards.
7.What is the process for return or replacement of AD7451BRMZ?
All AD7451BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7451BRMZ, 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 AD7451BRMZ part is unused and in its original packaging.
Return procedure for AD7451BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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