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Analog Devices Inc. AD7853LARSZ-REEL
- Part No.:
- AD7853LARSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7853LARSZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
AD7853LARSZ-REEL from Analog Devices is a 12-bit, pseudo-differential successive approximation register (SAR) analog-to-digital converter optimized for low-power operation at up to 100 kSPS. It operates from a single 3 V to 5.5 V supply, features on-chip 2.5 V reference, system/self-calibration, and flexible SPI/QSPI/μP-compatible serial interface. Used in battery-powered medical instruments and portable data acquisition systems requiring precision and extended runtime.
For engineers reviewing the AD7853LARSZ-REEL datasheet, AD7853LARSZ-REEL pinout, AD7853LARSZ-REEL application, or AD7853LARSZ-REEL equivalent, key selection criteria include its 100 kSPS throughput, 4.5 mW typical power dissipation at 3 V, ±1 LSB integral nonlinearity, 24-pin SSOP package, and support for unipolar/bipolar input ranges with external or internal reference.
Technical Context
The AD7853LARSZ-REEL implements a track-and-hold amplifier with 500 ns acquisition time feeding a 12-bit SAR ADC core, paired with a charge redistribution DAC and internal calibration memory. Its serial interface supports five programmable modes via SM1/SM2 pins, including self-clocking (SCLK output) and external-clocking (SCLK input) configurations.
Calibration logic includes automatic power-up self-calibration, system offset/gain calibration, and configurable power-down states (full or partial) controlled by PMGT bits in the control register. Input range selection (0 to VREF or ±VREF/2) is managed by the AMODE pin, while POLARITY sets SCLK idle state for compatibility with diverse host controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part in 4096 quantization granularity for high-fidelity signal digitization. |
| Sampling Rate | 100 kSPS - enables real-time capture of baseband signals up to ~40 kHz with Nyquist margin. |
| Power Dissipation | 4.5 mW at 3 V - supports >100-hour operation in coin-cell–powered devices without thermal derating. |
| INL / DNL | ±1 LSB max / ±1 LSB max - guarantees monotonicity and <0.025% full-scale linearity error across temperature. |
| Reference | Internal 2.5 V ±20 ppm/°C - eliminates need for external reference IC in cost-sensitive portable designs. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both single-ended sensor outputs and differential transducer signals. |
| Interface | SPI/QSPI/8051-compatible serial port - interoperates with common microcontrollers without protocol translation. |
Pinout & Package
AD7853LARSZ-REEL is housed in a 24-lead SSOP (Shrink Small Outline Package) with 0.635 mm lead pitch and exposed pad for thermal enhancement. The package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start input | Edge-triggered command initiating track-to-hold transition and conversion; tied high if unused. |
| BUSY | Conversion status output | Active-high open-drain signal indicating ongoing conversion or calibration; used for handshaking. |
| SLEEP | Low-power mode control | Logic 0 powers down all circuitry except calibration memory; retains settings during sleep. |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference or accepts external 1.2 V to AVDD reference; requires CREF1/CREF2 decoupling. |
| AIN(+), AIN(–) | Pseudo-differential analog inputs | Supports unipolar (0 to VREF) or bipolar (±VREF/2) sampling; AIN(–) must be biased per AMODE setting. |
| AMODE | Analog range select | Logic 0 = 0 to VREF; Logic 1 = ±VREF/2 - configures input topology without external op-amp reconfiguration. |
| SCLK, DIN, DOUT, SYNC | Serial interface signals | Configurable for master/slave operation; supports continuous or noncontinuous clocking per SM1/SM2 mode selection. |
| AVDD, DVDD, AGND, DGND | Supply and ground rails | Separate analog/digital supplies reduce noise coupling; AGND/DGND must be connected at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Autocalibration on power-up | Eliminates manual calibration step during system boot; ensures ±1 LSB INL without host intervention. |
| Flexible power management | Three power states (normal, partial, full power-down) reduce current to 5 µA (clock off) or 10 µA (clock on). |
| Pseudo-differential input architecture | Rejects common-mode noise up to AVDD while enabling bipolar measurement without external level-shifting. |
| Wide reference voltage range | Accepts 1.2 V to AVDD reference - allows use of low-voltage references or direct connection to AVDD for rail-to-rail scaling. |
| Read-only default operation | Operates immediately after power-up without register writes - simplifies integration in resource-constrained MCUs. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform acquisition in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC digitizing amplified analog front-end signals at 100 kSPS with 12-bit resolution. Use Value: 4.5 mW power consumption at 3 V extends runtime; built-in calibration maintains accuracy across body-temperature variations. |
Use Scenario: Environmental sensor node logging temperature, humidity, and pressure over weeks on AA batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during measurement bursts, entering deep sleep between samples. Use Value: 5 µA sleep current with clock disabled minimizes quiescent drain; unipolar 0–2.5 V input matches standard sensor outputs. |
| Industrial Handheld Testers | Pen-Based Computing Interfaces |
Use Scenario: Portable multimeter capturing AC/DC voltage and current with autoranging and auto-zero. IC Role / Device Role / Timing Role: Precision ADC supporting both unipolar (voltage) and bipolar (current shunt) input configurations. Use Value: AMODE pin enables hardware-selectable input range; ±1 LSB INL ensures traceable metrology-grade readings. |
Use Scenario: Digitizing stylus position and pressure in pen computers using resistive touch overlay. IC Role / Device Role / Timing Role: High-speed sampling ADC interfacing directly to touch controller ASIC via SPI. Use Value: 100 kSPS throughput captures rapid pen motion; 24-pin SSOP footprint fits compact tablet PCB layouts. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, no internal reference, 8-pin SOIC | Lower resolution suits basic voltage monitoring; lacks calibration and bipolar input support | Select when cost and board space outweigh precision requirements |
| MAX11131ETE+ | 12-bit, 500 kSPS, internal reference, 16-pin TQFN, SPI-only interface | Higher speed and smaller package but no AMODE-configurable input polarity | Select for higher throughput or space-constrained designs where bipolar input is not needed |
Compared with ADS7822U and MAX11131ETE+, the AD7853LARSZ-REEL uniquely combines 12-bit accuracy, hardware-selectable unipolar/bipolar input, on-chip calibration, and ultra-low 4.5 mW active power-making it optimal for portable instrumentation where precision, flexibility, and battery life are jointly critical.
Availability
AD7853LARSZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial handheld testers, and pen-based computing interfaces requiring stable component supply and long-term lifecycle assurance.
Supply support for AD7853LARSZ-REEL 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 Wilmington, MA.
The AD7853LARSZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for portable and low-power measurement systems demanding accuracy, configurability, and minimal external components.
FAQ
What is the maximum sampling rate of the AD7853LARSZ-REEL?
The AD7853LARSZ-REEL achieves a maximum sampling rate of 100 kSPS under specified conditions (1 MHz CLKIN, –40°C to +85°C). This is fixed for the L-version and differs from the 200 kSPS capability of the standard AD7853. The conversion time is 10 µs maximum, consistent with its low-power design target.
Does the AD7853LARSZ-REEL require external calibration components?
No, the AD7853LARSZ-REEL performs automatic self-calibration on power-up using on-chip circuitry and requires only two external capacitors (CREF1 = 0.1 µF, CREF2 = 0.01 µF) on the reference pins. System calibration can also be executed in-circuit without additional hardware, retaining calibration data during SLEEP mode.
Can the AD7853LARSZ-REEL operate with a 1.8 V supply?
No, the AD7853LARSZ-REEL specifies AVDD and DVDD operating range as +3.0 V to +5.5 V. Operation below 3.0 V is outside absolute maximum ratings and will result in undefined behavior or failure. For sub-3 V systems, consider newer low-voltage SAR ADCs such as the AD7476A series.
What package type does the AD7853LARSZ-REEL use?
The AD7853LARSZ-REEL is supplied in a 24-lead SSOP (Shrink Small Outline Package) with 0.635 mm lead pitch, designated by the "RS" suffix in the ordering guide. It is distinct from the N-24 (DIP) and R-24 (SOIC) variants and offers reduced footprint and thermal resistance versus SOIC.
How does the AMODE pin affect analog input configuration in the AD7853LARSZ-REEL?
The AMODE pin selects between two input ranges: logic 0 configures unipolar mode (0 to VREF), where AIN(+) must stay ≥ AIN(–); logic 1 enables bipolar mode (±VREF/2), requiring AIN(–) to be biased to +VREF/2. This hardware-selectable mode eliminates external op-amp circuitry for range switching in the AD7853LARSZ-REEL.
AD7853LARSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3V ~ 5.5V
- Voltage - Supply, Digital:
- 3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7853LARSZ-REEL FAQ
1.How can I place an order for AD7853LARSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853LARSZ-REEL 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 AD7853LARSZ-REEL reliable?
The price and inventory of AD7853LARSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853LARSZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7853LARSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853LARSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853LARSZ-REEL?
AD7853LARSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853LARSZ-REEL 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 AD7853LARSZ-REEL?
For technical support, including AD7853LARSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853LARSZ-REEL requirements.
6.How does Aetrix verify that AD7853LARSZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7853LARSZ-REEL 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 AD7853LARSZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7853LARSZ-REEL?
All AD7853LARSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7853LARSZ-REEL, 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 AD7853LARSZ-REEL part is unused and in its original packaging.
Return procedure for AD7853LARSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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