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Analog Devices Inc. AD7451ARM
- Part No.:
- AD7451ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7451ARM.pdf
- Description:
- IC ADC 12BIT PSDO-IN 1MSPS 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
AD7451ARM from Analog Devices is a 12-bit, 1 MSPS pseudo-differential successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 2.7 V to 5.25 V supply. It features 70 dB SINAD at 100 kHz input, ±1.5 LSB INL (A version), 888 ns conversion time, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface - deployed in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the AD7451ARM datasheet, AD7451ARM pinout, AD7451ARM application, or AD7451ARM equivalent, this page delivers verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and application-level differences - all grounded in Rev. D datasheet specifications and Analog Devices' official ordering guide.
Technical Context
The AD7451ARM implements a SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier supporting up to 3.5 MHz input bandwidth. Its conversion is initiated by the falling edge of CS and clocked by SCLK, enabling precise sampling control without pipeline delay.
It accepts an external reference (100 mV to VDD) on VREF, supports pseudo-differential input via VIN+ and VIN– (where VIN– sets a dc-biased pseudo ground), and operates in Normal or Full Power-Down mode (1 μA max). Serial output is straight binary, MSB-first, with four leading zeros followed by 12 data bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity digitization of sensor or transducer signals. |
| Throughput Rate | 1 MSPS maximum - enables real-time capture of fast-changing analog waveforms in portable test equipment. |
| SINAD | 70 dB min at 100 kHz - ensures ≥11.3 effective bits of dynamic resolution for clean signal reconstruction. |
| INL | ±1.5 LSB max (A version) - guarantees monotonicity and linearity critical for closed-loop control feedback paths. |
| Power Dissipation | 4 mW max at 1 MSPS, VDD = 3 V - allows continuous high-speed operation in energy-constrained battery systems. |
| Reference Range | 100 mV to VDD - permits flexible scaling from low-voltage sensors (e.g., MEMS) to full-supply-rail inputs. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.01% of 1 MSPS period, preserving SNR at high input frequencies. |
Pinout & Package
AD7451ARM is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with thermal impedance θJC = 91.99°C/W. Pin numbering follows standard SOT-23 top-view orientation (pin 1 at top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | 2.7 V to 5.25 V single supply; requires 0.1 μF ceramic + 10 μF tantalum decoupling to GND for stable conversion performance. |
| SCLK (Pin 2) | Serial Clock Input | Controls both data readout timing and internal SAR conversion clock; supports up to 18 MHz for 1 MSPS throughput. |
| SDATA (Pin 3) | Serial Data Output | Three-state, MSB-first output delivering 12-bit result prefixed by four leading zeros; compatible with SPI/QSPI/MICROWIRE protocols. |
| CS (Pin 4) | Chip Select (Active Low) | Initiates conversion on falling edge; frames serial data transfer; enables precise sample timing control in microprocessor interfaces. |
| VREF (Pin 5) | External Reference Input | Accepts 100 mV–VDD reference voltage; determines full-scale input span (VIN+ − VIN–); requires ≥0.1 μF decoupling capacitor. |
| VIN+ (Pin 6) | Noninverting Analog Input | Pseudo-differential input node; full-scale range equals VREF; referenced to VIN–, not GND. |
| VIN– (Pin 7) | Inverting Analog Input | DC bias point for VIN+; typically tied to GND or small offset voltage to establish pseudo ground reference. |
| GND (Pin 8) | Analog Ground | Common return for analog circuitry, reference, and input signals; must be separated from digital ground in mixed-signal layouts. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture ensures deterministic 16-SCLK-cycle conversion latency - essential for time-critical control loops. |
| Pseudo-differential input structure | Rejects common-mode noise on VIN+ and VIN– while enabling single-ended signal acquisition with reduced PCB routing complexity. |
| Flexible power/serial clock management | Throughput rate scales directly with SCLK frequency; combined with 1 μA power-down mode, enables dynamic power optimization. |
| Wide input bandwidth | 20 MHz full-power bandwidth (−3 dB) supports accurate digitization of fast transients and RF-adjacent baseband signals. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Eliminates need for protocol translation logic - simplifies integration with ARM Cortex-M, TI C2000, and ADI SHARC processors. |
Applications
| Portable Instrumentation | Battery-Powered Systems |
|---|---|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings with >100 kSPS sampling. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog front-end outputs; synchronized to microcontroller via CS/SCLK for burst-mode acquisition. Use Value: 12-bit resolution and 70 dB SINAD ensure accurate RMS calculations; 4 mW @ 3 V extends battery life beyond 24 hours in active measurement mode. |
Use Scenario: Wireless sensor node monitoring industrial vibration using piezoelectric accelerometers. IC Role / Device Role / Timing Role: High-fidelity digitizer for anti-alias filtered accelerometer output; triggered by wake-up interrupt to minimize idle power. Use Value: Pseudo-differential input rejects supply noise from RF transceiver; 1 μA power-down current preserves coin-cell battery for >1 year in sleep mode. |
| Data Acquisition Systems | Transducer Interface |
Use Scenario: Modular DAQ module in PLC backplane acquiring 8-channel analog inputs at 1 MSPS aggregate rate. IC Role / Device Role / Timing Role: Per-channel ADC with independent CS lines; daisy-chained SDATA outputs reduce FPGA I/O count. Use Value: 888 ns conversion time enables interleaved sampling across channels; SPI compatibility simplifies FPGA firmware development. |
Use Scenario: Strain gauge bridge signal conditioning in load cell amplifier with ratiometric reference. IC Role / Device Role / Timing Role: Ratiometric ADC where VREF is derived from bridge excitation voltage; VIN– biased to half-VREF for true differential measurement. Use Value: Variable VREF support (100 mV–VDD) enables direct ratiometric operation; ±1.5 LSB INL maintains <0.1% measurement accuracy over temperature. |
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 |
|---|---|---|---|
| AD7450ARMZ | 10-bit resolution, same 1 MSPS rate, identical SOT-23-8 package and pinout; lower power (3.5 mW @ 3 V), reduced INL (±0.5 LSB). | Targeted at cost-sensitive, lower-accuracy applications like basic sensor monitoring where 10-bit resolution suffices. | Select AD7450ARMZ when system ENOB requirements are ≤9.5 bits and BOM cost reduction is prioritized over precision. |
| ADS7822U | 12-bit, 200 kSPS max, SO-8 package; SPI-compatible but lacks power-down mode; higher typical INL (±2 LSB) and lower SINAD (65 dB). | Suited for lower-throughput industrial controls where extended acquisition time is acceptable and layout space permits SO-8. | Choose ADS7822U only if throughput demand is ≤200 kSPS and legacy SO-8 footprint compatibility is required. |
Compared with AD7450ARMZ, AD7451ARM provides 2 extra bits of resolution and higher dynamic performance at modest power cost; versus ADS7822U, it delivers 5× higher throughput, integrated power-down, and superior linearity - making it optimal for portable, high-speed, precision acquisition.
Availability
AD7451ARM is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered systems, and data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7451ARM 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 AD7451ARM belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, and high-accuracy data acquisition in space- and energy-constrained applications.
FAQ
What is the maximum sampling rate supported by the AD7451ARM?
The AD7451ARM supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock (SCLK) and 16 SCLK cycles per conversion. This rate is guaranteed across the full operating temperature range (−40°C to +85°C) and supply voltage range (2.7 V to 5.25 V), as specified in Table 1 of the Rev. D datasheet.
Does the AD7451ARM require an external reference voltage?
Yes, the AD7451ARM requires an external reference voltage applied to the VREF pin. The reference can range from 100 mV to VDD, with 2.5 V being the specified nominal value. The full-scale input span (VIN+ − VIN–) equals the VREF voltage, and performance parameters such as INL and SINAD are validated at VREF = 2.5 V per the datasheet test conditions.
What package type is used for the AD7451ARM?
The AD7451ARM is packaged in an 8-lead SOT-23 (Small Outline Transistor) package, compliant with JEDEC MO-178AA outline dimensions. This surface-mount package measures 2.9 mm × 1.6 mm × 1.1 mm and features gull-wing leads for reflow soldering - confirmed in the "Outline Dimensions" section (Page 23) and "Ordering Guide" (Page 24) of the Rev. D datasheet.
How does the pseudo-differential input of the AD7451ARM function in practice?
The AD7451ARM's pseudo-differential input uses VIN+ as the signal input and VIN– as a user-defined dc bias point (e.g., GND or a small offset), rather than a true differential pair. This configuration rejects common-mode noise while allowing single-ended signal acquisition. As stated in the datasheet, VIN– establishes the pseudo ground reference for VIN+, and its absolute voltage must remain within −0.1 V to +1.5 V depending on VDD.
Is the AD7451ARM pin-compatible with the AD7441ARM?
Yes, the AD7451ARM and AD7441ARM share identical pin configurations, package footprints (SOT-23-8 and MSOP-8), and serial interface protocol. Both devices use the same 16-SCLK conversion cycle and four-leading-zero data format - differing only in resolution (12-bit vs. 10-bit) and associated AC/DC performance specs. This allows direct substitution in existing designs where resolution headroom is available.
AD7451ARM 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:
- -
AD7451ARM FAQ
1.How can I place an order for AD7451ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7451ARM 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 AD7451ARM reliable?
The price and inventory of AD7451ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7451ARM is usually 5 days.
3.What payment methods are accepted for AD7451ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7451ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7451ARM?
AD7451ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7451ARM 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 AD7451ARM?
For technical support, including AD7451ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7451ARM requirements.
6.How does Aetrix verify that AD7451ARM is sourced from the original manufacturer or authorized distributors?
All AD7451ARM 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 AD7451ARM meets industry standards.
7.What is the process for return or replacement of AD7451ARM?
All AD7451ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7451ARM, 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 AD7451ARM part is unused and in its original packaging.
Return procedure for AD7451ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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