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Analog Devices Inc. AD7453BRTZ-R2
- Part No.:
- AD7453BRTZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
AD7453BRTZ-R2.pdf
- Description:
- IC ADC 12BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,719
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Product details
Overview
AD7453BRTZ-R2 from Analog Devices is a 12-bit, pseudo-differential successive approximation register (SAR) analog-to-digital converter optimized for high-speed, low-power data acquisition in space-constrained systems. It delivers 555 kSPS throughput at 3 V (3.3 mW max) or 5 V (7.25 mW max), features SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and operates from a single 2.7 V to 5.25 V supply with external reference input (100 mV to VDD). It is used in portable instrumentation requiring precise dc-coupled signal digitization.
For engineers reviewing the AD7453BRTZ-R2 datasheet, AD7453BRTZ-R2 pinout, AD7453BRTZ-R2 application, or AD7453BRTZ-R2 equivalent, key selection criteria include its 8-lead SOT-23 package footprint, guaranteed no-missed-codes DNL (±0.95 LSB max), 70 dB SINAD at 100 kHz, 1.6 µs conversion time, and power-down mode consuming ≤1 µA - all critical for battery-powered transducer interfaces.
Technical Context
The AD7453BRTZ-R2 implements a capacitive charge-redistribution SAR architecture with integrated differential track-and-hold amplifier capable of handling input frequencies up to 3.5 MHz. Its pseudo-differential input structure uses VIN+ for signal and VIN– for programmable dc offset reference, enabling rejection of common-mode voltage shifts without requiring dual supplies.
Conversion is initiated on the falling edge of CS, with sampling synchronized to that edge; the 16-cycle serial readout (4 leading zeros + 12-bit MSB-first natural binary) is clocked by SCLK. No pipeline delay ensures deterministic latency, and flexible clock-speed management allows dynamic power scaling - higher SCLK reduces conversion time and total energy per sample.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with LSB = VREF/4096, enabling ±1.22 mV resolution at 5 V full-scale with 2.5 V reference. |
| Throughput Rate | 555 kSPS maximum - supports real-time capture of signals up to ~200 kHz bandwidth (Nyquist-limited) in continuous conversion mode. |
| SINAD | 70 dB min at 100 kHz input - ensures ≥11.3 effective bits (ENOB) for accurate representation of dynamic sensor signals in noisy environments. |
| INL | ±1 LSB max (B version) - guarantees monotonicity and linearity critical for closed-loop control feedback paths and calibration-sensitive measurements. |
| Power Consumption | 3.3 mW max at 3 V / 555 kSPS - enables >100-hour operation on a single 3.7 V Li-ion cell in burst-sampling portable data loggers. |
| Power-Down Current | 1 µA max - reduces standby power by >1000× versus active mode, essential for wake-on-event architectures in IoT endpoints. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.01 LSB at 100 kHz, preserving SNR in medium-frequency ac signal acquisition. |
Pinout & Package
AD7453BRTZ-R2 is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), 2.9 mm × 1.6 mm × 1.1 mm body, with gull-wing leads and 0.65 mm pitch. The package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply | Single 2.7 V–5.25 V rail; requires local decoupling (0.1 µF ceramic + 10 µF tantalum) to suppress switching noise coupling into analog path. |
| SCLK | Serial clock input | Controls both data transfer timing and internal SAR conversion clock; supports up to 10 MHz, enabling 1.6 µs conversion time. |
| SDATA | Serial data output | Three-state, MSB-first 16-bit frame (4 zeros + 12-bit result); output coding is straight binary; load-dependent timing requires CL ≤ 25 pF. |
| CS | Chip select / conversion trigger | Active-low signal initiating sampling on falling edge; also frames serial readout; minimum pulse width 10 ns. |
| VREF | External reference input | Accepts 100 mV–VDD; sets full-scale range (VIN+ − VIN– = VREF); 2.5 V nominal; requires ≥0.1 µF decoupling to GND. |
| VIN+ | Noninverting analog input | Signal input terminal; full-scale swing = VREF p-p; input capacitance 30 pF (track) / 10 pF (hold); must be driven from low-impedance source. |
| VIN− | Inverting analog input | Pseudo-ground reference point; accepts dc offset (e.g., 0 V or 1.25 V) to level-shift bipolar inputs; input capacitance 10 pF (track) / 30 pF (hold). |
| GND | Analog ground reference | Common return for VREF, VIN+, VIN−, and internal circuitry; must connect to clean analog ground plane - separate from digital ground. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic 1.6 µs conversion latency - eliminates timing uncertainty in time-critical control loops and event-triggered sampling. |
| Pseudo-differential input architecture | Enables dc-coupled signal acquisition with common-mode rejection while using single supply - avoids need for level-shifting op amps in many sensor front-ends. |
| Flexible serial clock speed management | Throughput scales directly with SCLK frequency; increasing clock rate reduces conversion time and per-sample power, supporting adaptive energy optimization. |
| Guaranteed no-missed-codes performance | DNL ≤ ±0.95 LSB ensures monotonic transfer function across full temperature range - critical for position encoders and precision measurement where code dropout causes system errors. |
| Low-power shutdown mode | 1 µA max quiescent current extends battery life in intermittent-sampling applications such as environmental monitoring nodes. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered field instruments capturing temperature, pressure, and humidity over multi-day deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; samples triggered by microcontroller via CS; serial data read via SPI at 555 kSPS during active acquisition bursts. Use Value: 3.3 mW max active power at 3 V enables >120 hours runtime on 1000 mAh cell; 1 µA shutdown current minimizes self-discharge between logging intervals. |
Use Scenario: 4–20 mA loop-powered transmitters converting analog sensor signals to digital for HART or wireless backhaul. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing with bridge sensors or RTDs; referenced to stable 2.5 V shunt reference; operates from loop-derived 3.3 V rail. Use Value: ±1 LSB INL and 70 dB SINAD ensure <0.1% total error budget compliance; pseudo-differential input rejects common-mode noise from long sensor cables. |
| Handheld Test Equipment | Medical Vital Sign Monitors |
Use Scenario: Compact multimeters and oscilloscope probes requiring fast, precise dc and low-frequency ac measurements. IC Role / Device Role / Timing Role: Core acquisition engine performing burst-mode sampling of buffered analog inputs; CS-controlled single-shot conversions synchronized to display update rate. Use Value: 1.6 µs conversion time supports >500 kSPS real-time waveform capture; 8-lead SOT-23 footprint saves PCB area in ultra-portable form factors. |
Use Scenario: Wearable ECG/PPG modules digitizing biopotential signals with minimal size and power overhead. IC Role / Device Role / Timing Role: Low-noise ADC acquiring filtered biosignals; VIN– biased to mid-supply to accommodate bipolar electrode inputs; powered from regulated 3 V LDO. Use Value: 50 ps aperture jitter preserves signal fidelity at heart-rate frequencies; 70 dB SINAD meets IEC 60601-2-47 SNR requirements for diagnostic-grade acquisition. |
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 |
|---|---|---|---|
| ADS7822UID | 8-bit resolution, 200 kSPS max, SPI interface, 6-pin SOT-23 - lower resolution and speed; no pseudo-differential input (single-ended only). | Targeted at cost-sensitive, lower-accuracy industrial controls - insufficient for ENOB >10 bit requirements in precision instrumentation. | Select only if resolution ≤8 bits and input common-mode rejection is not required; AD7453BRTZ-R2 provides 4× more codes and true pseudo-differential capability. |
| MAX11100ETA+ | 12-bit, 500 kSPS, pseudo-differential, 10-lead µMAX - same resolution/speed class but larger package; integrated reference (1.0 V) vs. external reference flexibility. | Used in space-tolerant designs where board area is less constrained; fixed reference limits full-scale range adaptability compared to AD7453BRTZ-R2's 100 mV–VDD VREF range. | Choose MAX11100ETA+ only when integrated reference simplifies BOM and 10-lead layout is acceptable; AD7453BRTZ-R2 offers superior package density and reference voltage scalability. |
Compared with ADS7822UID and MAX11100ETA+, the AD7453BRTZ-R2 uniquely combines 12-bit accuracy, 555 kSPS speed, pseudo-differential input, and 8-lead SOT-23 packaging - making it the only option meeting strict size, power, and linearity requirements for next-generation portable medical and test equipment.
Availability
AD7453BRTZ-R2 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial sensor transmitters requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance across production lots.
Supply support for AD7453BRTZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing facilities worldwide.
The AD7453BRTZ-R2 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for space-constrained, low-power data acquisition systems where deterministic latency, low power, and high dc/dc+ac accuracy are mandatory - such as handheld test gear and wearable health monitors.
FAQ
What is the maximum recommended source impedance for the AD7453BRTZ-R2 analog inputs?
The AD7453BRTZ-R2 analog input performance degrades with increasing source impedance. At 100 kHz input frequency and 10 Ω source, THD is –80 dB; at 200 Ω, THD degrades to –50 dB. For THD ≤ –70 dB, Analog Devices recommends ≤62 Ω source impedance. Use a unity-gain buffer (e.g., AD8021) when driving from high-impedance sensors to maintain specified SINAD and INL performance in the AD7453BRTZ-R2.
Does the AD7453BRTZ-R2 support true differential input operation?
No, the AD7453BRTZ-R2 implements a pseudo-differential input architecture: VIN+ accepts the signal, while VIN– serves as a programmable dc reference (e.g., ground or mid-supply bias) rather than a true complementary signal input. This configuration rejects common-mode voltage shifts but does not provide full differential noise rejection like a true differential ADC. The AD7453BRTZ-R2 specification explicitly defines the input as "pseudo differential" in both the General Description and Pin Function Descriptions sections.
What is the minimum VREF voltage supported by the AD7453BRTZ-R2?
The AD7453BRTZ-R2 supports VREF voltages from 100 mV to VDD, as stated in the GENERAL DESCRIPTION and REFERENCE INPUT section of the datasheet. Operation at 100 mV VREF yields a full-scale input span of 100 mV (VIN+ − VIN–), resulting in LSB = 24.4 µV. Performance specifications (e.g., SINAD, INL) are guaranteed at VREF = 2.5 V; at lower VREF, noise floor and offset error become proportionally more significant relative to full-scale range.
Can the AD7453BRTZ-R2 operate with a 1.8 V digital interface while using a 3.3 V VDD?
No. The AD7453BRTZ-R2 logic inputs (CS, SCLK) and output (SDATA) are referenced to VDD, not a separate IOVDD rail. Input high voltage (VINH) is specified as 2.4 V min when VDD = 2.7–3.6 V, and output high voltage (VOH) is 2.4 V min under same conditions. Driving CS/SCLK with 1.8 V violates the VINH specification and risks unreliable operation. All digital signals must swing between 0 V and VDD (2.7–5.25 V) for guaranteed functionality in the AD7453BRTZ-R2.
How is the conversion result formatted on the SDATA pin of the AD7453BRTZ-R2?
The AD7453BRTZ-R2 outputs a 16-bit serial word on SDATA: four leading zeros followed by the 12-bit conversion result in MSB-first straight (natural) binary format. For example, a full-scale input yields "0000 1111 1111 1111". The first bit appears on SDATA one SCLK cycle after the CS falling edge, and the entire 16-bit frame is clocked out over 16 SCLK cycles. This framing is fixed and independent of VREF or input signal level in the AD7453BRTZ-R2.
AD7453BRTZ-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:
- 12
- Sampling Rate (Per Second):
- 555k
- 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:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7453BRTZ-R2 FAQ
1.How can I place an order for AD7453BRTZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7453BRTZ-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 AD7453BRTZ-R2 reliable?
The price and inventory of AD7453BRTZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7453BRTZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7453BRTZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7453BRTZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7453BRTZ-R2?
AD7453BRTZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7453BRTZ-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 AD7453BRTZ-R2?
For technical support, including AD7453BRTZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7453BRTZ-R2 requirements.
6.How does Aetrix verify that AD7453BRTZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7453BRTZ-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 AD7453BRTZ-R2 meets industry standards.
7.What is the process for return or replacement of AD7453BRTZ-R2?
All AD7453BRTZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7453BRTZ-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 AD7453BRTZ-R2 part is unused and in its original packaging.
Return procedure for AD7453BRTZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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