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Analog Devices Inc. AD7440BRTZ-R2
- Part No.:
- AD7440BRTZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7440BRTZ-R2.pdf
- Description:
- IC ADC 10BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,047
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Product details
Overview
AD7440BRTZ-R2 from Analog Devices is a 10-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with fully differential analog inputs, operating from single 3 V or 5 V supply, delivering 61 dB SINAD at 100 kHz input and ±0.5 LSB INL - used in battery-powered data acquisition and portable instrumentation where low power and small footprint are critical.
For engineers reviewing the AD7440BRTZ-R2 datasheet, AD7440BRTZ-R2 pinout, AD7440BRTZ-R2 application, or AD7440BRTZ-R2 equivalent, key selection considerations include its 8-lead SOT-23 package, SPI/QSPI/MICROWIRE-compatible serial interface, 4 mW max power at 3 V/1 MSPS, differential input range of ±VREF, and guaranteed no missing codes over temperature.
Technical Context
The AD7440BRTZ-R2 employs a SAR architecture with no pipeline delay, enabling deterministic conversion timing controlled by CS and SCLK edges. Its differential track-and-hold amplifier supports up to 3.5 MHz input bandwidth and accepts variable external reference voltage (100 mV to 2.2 V at 3 V supply, up to 3.5 V at 5 V).
Conversion is initiated on the falling edge of CS; data is clocked out MSB-first on SDATA with four leading zeros followed by 10-bit twos-complement result. Power-down mode draws ≤1 μA, and serial clock speed directly governs throughput and dynamic power consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for medium-precision measurement systems. |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of signals up to 500 kHz per Nyquist criterion. |
| SINAD @ 100 kHz | 61 dB min - ensures ≥9.8 effective bits for clean signal capture in transducer interfaces. |
| INL | ±0.5 LSB max - guarantees monotonicity and linearity critical for closed-loop motor control feedback. |
| Power Dissipation @ 3 V | 4 mW max at 1 MSPS - supports >100-hour operation in coin-cell–powered portable instruments. |
| Reference Range | 100 mV to 2.2 V (3 V supply) - allows flexible input scaling from millivolt-level sensor outputs to rail-referenced signals. |
| Package | 8-lead SOT-23 - occupies <2.5 mm² PCB area, suitable for space-constrained wearable and IoT endpoints. |
Pinout & Package
AD7440BRTZ-R2 is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with gull-wing leads, 0.65 mm pitch, and thermal resistance θJA = 211.5°C/W. Pin 1 is marked via laser scribe or dimple; device orientation follows standard SOT-23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | External reference input | Accepts 100 mV–2.2 V (3 V supply); sets full-scale differential span (2 × VREF) and common-mode bias point. |
| VIN+ | Differential analog input (+) | High-impedance input (±1 µA leakage); paired with VIN− for noise-rejecting signal acquisition. |
| VIN− | Differential analog input (−) | Complements VIN+; enables rejection of common-mode interference in noisy industrial environments. |
| GND | Analog ground reference | Single-point return for analog circuitry, reference decoupling, and sensor signal referencing. |
| CS | Active-low chip select | Initiates conversion on falling edge; frames serial data transfer and enables multi-device SPI bus sharing. |
| SDATA | Serial data output | Three-state, MSB-first output: 4 leading zeros + 10-bit twos-complement result + 2 trailing zeros. |
| SCLK | Serial clock input | Drives internal conversion timing and data clocking; supports up to 18 MHz for 1 MSPS operation. |
| VDD | Power supply | Accepts 2.7–3.6 V (±10% tolerance); requires 0.1 µF ceramic + 10 µF tantalum decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | SAR architecture ensures deterministic, single-cycle latency - essential for time-critical control loops. |
| Fully differential input | Rejects common-mode noise up to 70 dB at 100 kHz - improves SNR in motor drive current sensing. |
| Flexible reference scaling | VREF adjustable from 100 mV to 2.2 V enables direct interfacing with low-output sensors without gain stages. |
| Low-power shutdown | 1 µA max quiescent current in full power-down - extends battery life during idle periods in portable meters. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to ARM Cortex-M, TI C2000, and ADSP-BF5xx processors without protocol translation logic. |
Applications
| Transducer Interface | Battery-Powered Data Logger |
|---|---|
Use Scenario: High-accuracy measurement of bridge-based pressure or load cells with mV-level output and high common-mode noise. IC Role / Device Role / Timing Role: ADC front-end digitizing differential sensor output with 10-bit resolution and 1 MSPS sampling for oversampling noise reduction. Use Value: Differential input rejects EMI from nearby switching regulators; 61 dB SINAD preserves signal fidelity without external amplification. |
Use Scenario: Multi-channel environmental monitoring node powered by CR2032 coin cell, logging temperature, humidity, and acceleration. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 10 kSPS bursts, then entering 1 µA shutdown between samples. Use Value: 4 mW max at 3 V/1 MSPS and 1 µA shutdown enable >12-month battery life with duty-cycled operation. |
| Portable Oscilloscope Front-End | Motor Phase Current Monitoring |
Use Scenario: Handheld 2-channel scope capturing audio-band waveforms with real-time display and FFT analysis. IC Role / Device Role / Timing Role: High-speed ADC sampling analog front-end outputs with precise timing control via CS/SCLK synchronization. Use Value: 1 MSPS throughput supports 500 kHz bandwidth; no pipeline delay ensures accurate trigger-to-acquisition alignment. |
Use Scenario: Inverter-driven BLDC motor with shunt-based current sensing in HVAC fan or e-bike controller. IC Role / Device Role / Timing Role: Isolated differential ADC digitizing bidirectional current through low-value shunt resistor at PWM switching frequency. Use Value: ±0.5 LSB INL ensures <0.1% gain error across temperature; differential input rejects high dv/dt noise from gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7450ABRTZ-R2 | 12-bit resolution, 70 dB SINAD min, same package and pinout - higher precision but 1.95 mA max IDD at 5 V vs. 1.45 mA for AD7440BRTZ-R2. | Used where ENOB > 11 bits required (e.g., precision medical sensors), not cost-sensitive portable designs. | Select AD7450ABRTZ-R2 only if 12-bit linearity and 9-bit ENOB are mandatory; AD7440BRTZ-R2 offers better power efficiency for 10-bit use cases. |
| ADS7822U | 12-bit, 200 kSPS max, 8-pin SOIC - lower speed, larger package, different serial protocol (no CS framing), 1.25 mW at 3 V. | Suitable for slower, non-real-time monitoring (e.g., building automation), not high-throughput portable instrumentation. | Choose ADS7822U only when throughput <200 kSPS suffices and SOIC layout is acceptable; AD7440BRTZ-R2 provides 5× speed in SOT-23. |
Compared with AD7450ABRTZ-R2 and ADS7822U, AD7440BRTZ-R2 uniquely balances 1 MSPS speed, 10-bit accuracy, sub-4 mW power at 3 V, and 8-lead SOT-23 size - making it optimal for space- and power-constrained portable measurement systems requiring deterministic latency.
Availability
AD7440BRTZ-R2 is available at Aetrix Electronics and suitable for battery-powered instrumentation, transducer interface modules, and portable oscilloscope front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7440BRTZ-R2 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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7440BRTZ-R2 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed data acquisition in portable, industrial, and sensor interface applications where size, power, and AC performance are jointly constrained.
FAQ
What is the maximum sampling rate supported by the AD7440BRTZ-R2?
The AD7440BRTZ-R2 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock and proper CS timing. Conversion time is fixed at 16 SCLK cycles (888 ns at 18 MHz), and the device guarantees no pipeline delay - enabling deterministic real-time sampling for control and measurement applications.
Does the AD7440BRTZ-R2 require an external reference voltage?
Yes, the AD7440BRTZ-R2 requires an external reference voltage applied to the VREF pin. For specified performance at 3 V supply, VREF should be 2.0 V (±1%); at 5 V supply, 2.5 V (±1%). The reference can be scaled from 100 mV to 2.2 V (3 V supply) or up to 3.5 V (5 V supply), setting both full-scale range and common-mode input level.
What serial interface protocols is the AD7440BRTZ-R2 compatible with?
The AD7440BRTZ-R2 features an SPI-compatible serial interface that operates with SPI, QSPI, MICROWIRE, and DSP host controllers. It uses CS for frame synchronization, SCLK for timing, and SDATA for MSB-first output (4 leading zeros + 10-bit twos-complement result + 2 trailing zeros), requiring no additional protocol translation hardware.
How does the power consumption of the AD7440BRTZ-R2 scale with throughput?
AD7440BRTZ-R2 power scales linearly with throughput: at 100 kSPS, typical dissipation is 0.6 mW (3 V); at 1 MSPS, it is 4 mW max (3 V). Full power-down mode draws ≤1 µA regardless of clock state. This scalability allows dynamic power management in burst-mode data loggers and handheld instruments.
Is the AD7440BRTZ-R2 pin-compatible with the AD7450A series?
Yes, the AD7440BRTZ-R2 is pin-compatible with the AD7450ABRTZ-R2 in the 8-lead SOT-23 package: identical pinout, supply, reference, and interface signaling. However, AD7450A delivers 12-bit resolution and higher SINAD (70 dB min), while AD7440BRTZ-R2 optimizes for lower power and cost in 10-bit applications.
AD7440BRTZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 10
- 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:
- 3V, 5V
- Voltage - Supply, Digital:
- 3V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7440BRTZ-R2 FAQ
1.How can I place an order for AD7440BRTZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7440BRTZ-R2 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 AD7440BRTZ-R2 reliable?
The price and inventory of AD7440BRTZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7440BRTZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7440BRTZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7440BRTZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7440BRTZ-R2?
AD7440BRTZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7440BRTZ-R2 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 AD7440BRTZ-R2?
For technical support, including AD7440BRTZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7440BRTZ-R2 requirements.
6.How does Aetrix verify that AD7440BRTZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7440BRTZ-R2 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 AD7440BRTZ-R2 meets industry standards.
7.What is the process for return or replacement of AD7440BRTZ-R2?
All AD7440BRTZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7440BRTZ-R2, 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 AD7440BRTZ-R2 part is unused and in its original packaging.
Return procedure for AD7440BRTZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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