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Analog Devices Inc. AD7853LARS
- Part No.:
- AD7853LARS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7853LARS.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
AD7853LARS from Analog Devices is a 12-bit, 100 kSPS pseudo-differential successive-approximation ADC optimized for low-power operation on single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, system/self-calibration, flexible SPI/QSPI/μP-compatible serial interface, and 24-lead SSOP package. Used in battery-powered medical instruments and portable data acquisition.
For engineers reviewing the AD7853LARS datasheet, AD7853LARS pinout, AD7853LARS application, or AD7853LARS equivalent, key selection criteria include its 4.5 mW typical power at 3 V, 100 kSPS throughput, ±1 LSB integral nonlinearity, 0–VREF or ±VREF/2 input ranges, and support for software-initiated conversion and automatic power-down after conversion.
Technical Context
The AD7853LARS employs a charge redistribution SAR architecture with integrated track-and-hold (500 ns acquisition), internal 2.5 V reference, and dual calibration modes-self-calibration on power-up and system calibration via external signals. Its analog front-end supports pseudo-differential inputs with AMODE-selectable unipolar (0 to VREF) or bipolar (±VREF/2) ranges.
Serial communication uses four interface modes selected by SM1/SM2 pins, supporting both external-clock (SCLK input) and self-clocking (SCLK output) configurations. POLARITY pin controls SCLK idle state, and SYNC functions as frame sync or chip select depending on mode-enabling interoperability with 8051, SPI, and QSPI controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise measurement of small signal changes |
| Throughput Rate | 100 kSPS - enables real-time sampling of signals up to ~40 kHz Nyquist bandwidth |
| Power Dissipation | 6.85 mW at 3.6 V - supports extended battery life in portable instrumentation without thermal derating |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and <0.025% full-scale error across temperature range |
| Input Range | 0 to VREF or ±VREF/2 - selectable via AMODE pin for unipolar sensor outputs or bipolar AC-coupled signals |
| Reference | Internal 2.5 V ±20 ppm/°C - eliminates need for external reference; REFIN/REFOUT pin allows overdrive or bypass |
| Calibration | Auto-calibration on power-up - retains accuracy over time and temperature without host intervention |
Pinout & Package
AD7853LARS is housed in a 24-lead Small Shrink Outline Package (SSOP), 0.150" body width, with exposed pad not electrically connected. Pin pitch is 0.025", compliant with JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Edge-triggered control: rising edge initiates track-to-hold transition and starts conversion sequence |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking |
| SLEEP | Low-Power Mode Control | Logic 0 powers down all circuitry including internal reference while retaining calibration data |
| REFIN/REFOUT | Reference Voltage Node | Provides 2.5 V internal reference; accepts external reference up to AVDD; requires CREF1/CREF2 decoupling |
| AIN(+), AIN(–) | Pseudo-Differential Analog Inputs | Supports unipolar (0–VREF) or bipolar (±VREF/2) input ranges; AIN(–) must be biased accordingly |
| AMODE | Analog Range Select | Logic 0 = unipolar (0 to VREF); Logic 1 = bipolar (±VREF/2); determines input voltage constraints |
| CAL | Calibration Initiate | Rising edge triggers full self-calibration; internal pull-up enables auto-cal on power-up with 10 nF capacitor to DGND |
| DOUT/DIN/SCLK/SYNC | Serial Interface Signals | Configurable SPI-compatible port with four interface modes; supports 8051/QSPI timing and software-controlled conversion |
Key Features
| Feature | Design Value |
|---|---|
| Single 3 V to 5.5 V Supply Operation | Eliminates dual-supply design complexity and reduces BOM count in portable systems |
| On-Chip 2.5 V Reference with Tempco ≤20 ppm/°C | Enables stable conversion without external reference IC or trimming, reducing layout sensitivity |
| System and Self-Calibration Support | Compensates for gain/offset drift over temperature and time-no host MCU firmware calibration required |
| Four Configurable Serial Interface Modes | Interoperates with legacy 8051, standard SPI, and QSPI controllers without protocol translation logic |
| Automatic Power-Down After Conversion | Reduces average current to µA-level between conversions-critical for duty-cycled sensor nodes |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring 100 kSPS bipolar ECG signals with ±1.25 V range and 12-bit resolution. Use Value: Low 4.5 mW power at 3 V extends runtime; on-chip calibration maintains diagnostic accuracy across operating temperature. | Use Scenario: Environmental sensor node logging temperature, humidity, and pressure every 10 seconds using intermittent wake-up. IC Role / Device Role / Timing Role: Low-duty-cycle ADC triggered by microcontroller; enters sleep mode between samples to minimize quiescent current. Use Value: Automatic power-down after conversion cuts average supply current to <1 µA; 24-pin SSOP fits compact PCB layouts. |
| Industrial Field Transmitters | Pen-Based Computing Interfaces |
Use Scenario: 4–20 mA loop-powered transmitter digitizing thermocouple or RTD signals in hazardous locations. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned analog inputs with system calibration against known reference. Use Value: REFIN/REFOUT pin accepts precision external reference; ±1 LSB INL ensures compliance with IEC 61000-4-5 immunity requirements. | Use Scenario: Digitizing stylus position and pressure in pen computers with high-resolution touch detection. IC Role / Device Role / Timing Role: High-speed sampling ADC capturing rapid pen movement at >50 kSPS with minimal latency. Use Value: 500 ns track/hold acquisition enables accurate capture of fast transients; SPI interface synchronizes with host processor clock. |
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 |
|---|---|---|---|
| AD7476AARMZ | 12-bit, 1 MSPS, 3.6 mW at 3 V; no internal reference; requires external REF | Higher speed but lacks on-chip reference and calibration - demands more external components and host calibration effort | Choose when throughput >100 kSPS is mandatory and board space allows external reference + calibration routine |
| ADS7822U | 12-bit, 200 kSPS, 5.5 mW at 3 V; internal reference; SPI-only interface; no system calibration | Higher speed and lower power than AD7853LARS but lacks system calibration and multi-mode serial compatibility | Prefer for cost-sensitive, SPI-only designs where self-calibration suffices and external calibration is impractical |
Compared with AD7853LARS, AD7476AARMZ offers higher speed but increases system complexity with external reference and calibration, while ADS7822U trades system calibration and interface flexibility for marginal power reduction and speed gain-making AD7853LARS optimal for robust, low-maintenance portable instrumentation.
Availability
AD7853LARS is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial field transmitters, and pen-based computing interfaces requiring stable component supply and long-term lifecycle support.
Supply support for AD7853LARS 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 AD7853LARS belongs to the AD7853 family of low-power, single-supply SAR ADCs designed specifically for portable and battery-operated instrumentation where accuracy, calibration autonomy, and power efficiency are critical.
FAQ
What is the maximum sampling rate supported by the AD7853LARS?
The AD7853LARS supports a maximum throughput rate of 100 kSPS. This is achieved with a 1 MHz master clock (CLKIN) over its full –40°C to +85°C operating range. At 0°C to +70°C, it can operate up to 1.8 MHz CLKIN for the same 100 kSPS rate. The conversion time is fixed at 10 µs (18 × tCLKIN) under these conditions. This specification is confirmed in the Rev. B datasheet timing table and applies specifically to the AD7853LARS variant.
Does the AD7853LARS require an external reference voltage?
No, the AD7853LARS includes an internal 2.5 V reference with ±20 ppm/°C tempco, accessible via the REFIN/REFOUT pin. It operates fully functional with this internal reference. However, the pin supports overdriving with an external reference from 1.2 V to AVDD, enabling higher precision or custom voltage scaling. External decoupling capacitors (CREF1 = 0.1 µF, CREF2 = 0.01 µF) are mandatory for stability, as specified in the AD7853LARS pin function descriptions.
How does the AD7853LARS handle calibration, and is host intervention required?
The AD7853LARS supports automatic self-calibration on power-up when a 10 nF capacitor is connected from CAL to DGND. It also supports manual system calibration via the CAL pin's rising edge. Calibration data is retained during SLEEP mode. No host MCU firmware is required for basic operation-the device powers up ready for read-only use. This autonomous calibration capability is explicitly documented in the AD7853LARS General Description and PRODUCT HIGHLIGHTS sections.
What serial interface protocols does the AD7853LARS support?
The AD7853LARS supports four configurable serial interface modes selected by SM1/SM2 pins, compatible with 8051, SPI™, and QSPI™ protocols. It operates with either external SCLK (input) or self-clocking (SCLK output), and supports both CPOL/CPHA variants via the POLARITY pin. These capabilities are defined in Table X and timing diagrams Figures 2–3 of the AD7853LARS datasheet, confirming direct interoperability with common microcontroller peripherals without glue logic.
What package type is used for the AD7853LARS, and are there thermal considerations?
The AD7853LARS is supplied in a 24-lead Small Shrink Outline Package (SSOP), designated RS-24 in the Ordering Guide. Its θJA is 115°C/W, and absolute maximum junction temperature is +150°C. With typical power dissipation of 6.85 mW at 3.6 V, self-heating is negligible (<1°C rise) under normal operation-no heatsink or airflow is required. This package choice balances compact size, manufacturability, and thermal performance for portable applications.
AD7853LARS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7853LARS FAQ
1.How can I place an order for AD7853LARS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853LARS 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 AD7853LARS reliable?
The price and inventory of AD7853LARS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853LARS is usually 5 days.
3.What payment methods are accepted for AD7853LARS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853LARS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853LARS?
AD7853LARS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853LARS 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 AD7853LARS?
For technical support, including AD7853LARS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853LARS requirements.
6.How does Aetrix verify that AD7853LARS is sourced from the original manufacturer or authorized distributors?
All AD7853LARS 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 AD7853LARS meets industry standards.
7.What is the process for return or replacement of AD7853LARS?
All AD7853LARS units undergo pre-shipment inspection (PSI). If there is an issue with AD7853LARS, 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 AD7853LARS part is unused and in its original packaging.
Return procedure for AD7853LARS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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