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Analog Devices Inc. AD7472BRU
- Part No.:
- AD7472BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7472BRU.pdf
- Description:
- IC ADC 12BIT SAR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
AD7472BRU from Analog Devices is a 12-bit, 1.5 MSPS high-speed successive approximation ADC in a 24-lead TSSOP package. It operates from a single 2.7 V to 5.25 V supply, consumes 4.5 mW at 3 V/1.2 MSPS, features 70 dB SNR at 500 kHz input, and uses an external 2.5 V reference for 0 V to 2.5 V analog input range. It is used in real-time sensor data acquisition systems requiring low-latency parallel interface and deterministic conversion timing.
For engineers reviewing the AD7472BRU datasheet, AD7472BRU pinout, AD7472BRU application, or AD7472BRU equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL (B version), 14-cycle conversion time, sleep-mode current of 1 µA, and compatibility with 3 V or 5 V digital logic via independent VDRIVE supply.
Technical Context
The AD7472BRU implements a standard SAR architecture with track-and-hold front-end, no pipeline delay, and precise sampling controlled by the falling edge of CONVST. Conversion is clocked by an external master clock (up to 26 MHz at 5 V), and BUSY output signals completion after exactly 531.66 ns (at 26 MHz).
It supports flexible power management: throughput scales linearly with clock frequency, and auto-sleep mode enables 124 µA average current at 100 kSPS with 3 V supplies. The dual-supply design separates AVDD/DVDD (2.7–5.25 V) from VDRIVE (2.7–5.25 V) to decouple analog performance from digital I/O voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement applications |
| Throughput Rate | 1.5 MSPS max at 5 V / 1.2 MSPS max at 3 V - enables real-time sampling of fast transients |
| SNR | 70 dB typ at 500 kHz input - supports clean digitization of medium-bandwidth analog signals |
| INL | ±1 LSB max (B version) - ensures monotonicity and accurate end-point linearity |
| Power Dissipation | 4.5 mW max at 3 V - allows battery-powered or thermally constrained embedded designs |
| Sleep Current | 1 µA max - enables ultra-low-power duty-cycled operation in sensor wake-up systems |
| Aperture Jitter | 15 ps typ - limits sampling uncertainty for high-frequency signal fidelity |
Pinout & Package
AD7472BRU is housed in a 24-lead TSSOP (RU-24) package with 0.65 mm pitch, 7.8 mm × 4.4 mm body, and thermal impedance θJA = 115°C/W. Pin functions are validated per Analog Devices Rev. B datasheet Figure 7 (AD7472 top view) and Pin Function Descriptions (pp. 7–8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB11 | Parallel data outputs (LSB to MSB) | Three-state CMOS outputs driven by VDRIVE; enable direct connection to 3 V or 5 V microprocessor data buses |
| CONVST | Conversion start trigger | Falling-edge–sensitive control that initiates hold mode and conversion; pulse width ≥10 ns |
| BUSY | Conversion status indicator | Active-high open-drain output; goes low 531.66 ns after CONVST fall (26 MHz CLKIN), signaling result readiness |
| CS / RD | Parallel bus access controls | Interchangeable active-low inputs; both must fall to place conversion result on DB[0:11] bus |
| CLKIN | Master conversion clock input | Accepts 20–26 MHz (5 V) or 14–20 MHz (3 V); determines throughput and conversion time (14 cycles) |
| VIN | Analog input channel | Single-ended input referenced to AGND; 0 V to REF IN range; 33 pF input capacitance |
| REF IN | External reference input | Requires 2.5 V ±1% stable reference; sets full-scale range and directly impacts gain accuracy |
| AVDD / DVDD | Analog/digital supply rails | 2.7–5.25 V each; must be within 0.3 V of each other; separate AGND/DGND required |
| VDRIVE | Digital output driver supply | Independent 2.7–5.25 V rail sets VOH level (VDRIVE – 0.2 V), enabling mixed-voltage system interfacing |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True single-shot conversion with deterministic latency (14 CLKIN cycles + acquisition), enabling precise time-critical sampling |
| Auto-sleep mode | Automatic entry into 1 µA sleep state after conversion completes if CONVST remains low - eliminates software overhead for power gating |
| VDRIVE-independent outputs | Output logic levels set by dedicated VDRIVE pin, allowing AVDD/DVDD to run at 5 V for analog performance while interfacing to 3 V FPGAs or MCUs |
| Guaranteed no missing codes | Specified for 12-bit monotonicity (B version) - ensures reliable code transitions across full dynamic range without ambiguity |
| Flexible clocking | Throughput rate fully scalable via external CLKIN frequency - supports adaptive power/performance trade-offs without firmware changes |
Applications
| Industrial Process Monitoring | Medical Instrumentation |
|---|---|
|
Use Scenario: Continuous acquisition of pressure, temperature, and flow sensor outputs in PLC-based control cabinets with tight thermal budgets. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing analog sensor channels at 1 MSPS with deterministic BUSY-driven readout timing. Use Value: 4.5 mW power at 3 V enables fanless enclosure design; ±1 LSB INL ensures calibration stability over 85°C operating range. |
Use Scenario: High-fidelity waveform digitization in portable ECG and EEG front-ends where SNR and low power are critical. IC Role / Device Role / Timing Role: Single-ended analog-to-digital converter sampling biopotential signals with 70 dB SNR at 500 kHz bandwidth. Use Value: 15 ps aperture jitter preserves signal integrity; sleep mode reduces average current to 124 µA at 100 kSPS for extended battery life. |
| Automotive Sensor Interface | Test & Measurement Equipment |
|
Use Scenario: Engine control unit (ECU) subsystem measuring throttle position, knock sensor, and exhaust gas oxygen signals under harsh ambient conditions. IC Role / Device Role / Timing Role: Robust 12-bit ADC with AEC-Q200-compatible SOIC/TSSOP packaging and −40°C to +85°C operation. Use Value: Dual ground (AGND/DGND) separation and 0.3 V supply tolerance prevent noise coupling in noisy automotive electrical environments. |
Use Scenario: Modular data acquisition modules requiring parallel interface compatibility with legacy FPGA-based controller boards. IC Role / Device Role / Timing Role: High-speed parallel-output ADC synchronized to external clock and controlled via CS/RD handshake. Use Value: 14-cycle conversion time and BUSY timing guarantee predictable data availability for real-time buffer management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7472ARU | A-version (±2 LSB INL, ±1.8 LSB DNL) vs. B-version's tighter ±1/±0.9 LSB specs; same 24-lead TSSOP package and pinout | Lower-cost option where 12-bit monotonicity is sufficient but guaranteed no-missing-codes to 12 bits is not required | Select AD7472ARU for cost-sensitive industrial monitoring where full 12-bit linearity is not critical |
| AD7472BR | Identical electrical specs and B-grade performance, but in 24-lead SOIC (R-24) instead of TSSOP (RU-24) | Preferred for through-hole prototyping or legacy PCBs with SOIC footprints; higher θJA (75°C/W vs. 115°C/W) | Choose AD7472BR when board layout requires SOIC or thermal dissipation margin exceeds 115°C/W requirement |
Compared with AD7472ARU and AD7472BR, the AD7472BRU offers the tightest DC accuracy (±1 LSB INL) in the smallest footprint (TSSOP), making it optimal for space-constrained, high-precision embedded systems where thermal headroom permits 115°C/W junction rise.
Availability
AD7472BRU is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, automotive sensor interface, and test & measurement equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for AD7472BRU 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 AD7472BRU belongs to the AD7470/AD7472 family of high-speed, low-power SAR ADCs designed specifically for embedded systems needing deterministic timing, parallel interface simplicity, and flexible voltage operation without sacrificing resolution or SNR.
FAQ
What is the maximum clock frequency supported by AD7472BRU?
The AD7472BRU supports up to 26 MHz CLKIN at 5 V supply and up to 20 MHz at 3 V supply, as specified in the B-version electrical characteristics table. This defines the upper limit of its 1.5 MSPS (5 V) or 1.2 MSPS (3 V) throughput capability. Exceeding these frequencies may cause timing violations or conversion errors. The AD7472BRU datasheet explicitly states these values for the B version under "AD7472–SPECIFICATIONS" on page 3.
Does AD7472BRU require an external reference, and what voltage is specified?
Yes, AD7472BRU requires an external reference applied to the REF IN pin. The datasheet specifies 2.5 V ±1% for full performance compliance, including SNR, THD, and INL. Deviations beyond this tolerance degrade DC accuracy and dynamic performance. The AD7472BRU does not include an internal reference; REF IN is a high-impedance input with ±1 µA leakage and 10/20 pF capacitance.
How does the auto-sleep mode function on AD7472BRU?
When CONVST remains low after conversion completes, the AD7472BRU automatically enters sleep mode on the falling edge of BUSY. Wake-up occurs on the next rising edge of CONVST, with typical wake-up time of 1 µs. In this mode, the AD7472BRU draws just 1 µA (max) at 5 V, enabling ultra-low-power operation in duty-cycled sensor systems without external control logic.
What is the purpose of the VDRIVE pin on AD7472BRU?
The VDRIVE pin on AD7472BRU sets the high-level output voltage (VOH = VDRIVE – 0.2 V) for all DB[0:11] data pins. It allows independent biasing of digital outputs - for example, running AVDD/DVDD at 5 V to maximize analog performance while interfacing DB[0:11] to a 3 V FPGA or MCU. This decouples I/O voltage from core supply, enhancing system-level voltage translation flexibility.
Is AD7472BRU pin-compatible with other variants in the AD7472 family?
Yes, AD7472BRU shares identical pinout and package (24-lead TSSOP, RU-24) with AD7472ARU and AD7472YRU. All three variants use the same physical layout, signal assignments, and mechanical footprint. Differences are limited to grade (A/B/Y), temperature range (−40°C to +85°C for BRU), and DC specifications - no PCB redesign is needed when substituting within the RU-24 package group.
AD7472BRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1.5M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- 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:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7472BRU FAQ
1.How can I place an order for AD7472BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7472BRU 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 AD7472BRU reliable?
The price and inventory of AD7472BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7472BRU is usually 5 days.
3.What payment methods are accepted for AD7472BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7472BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7472BRU?
AD7472BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7472BRU 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 AD7472BRU?
For technical support, including AD7472BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7472BRU requirements.
6.How does Aetrix verify that AD7472BRU is sourced from the original manufacturer or authorized distributors?
All AD7472BRU 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 AD7472BRU meets industry standards.
7.What is the process for return or replacement of AD7472BRU?
All AD7472BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7472BRU, 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 AD7472BRU part is unused and in its original packaging.
Return procedure for AD7472BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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