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Analog Devices Inc. AD7853LAR-REEL
- Part No.:
- AD7853LAR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7853LAR-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,366
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Product details
Overview
AD7853LAR-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, self- and system-calibration, and supports SPI/QSPI/8051-compatible serial interface. Used in battery-powered instrumentation and portable medical devices requiring precision sampling with minimal power draw.
For engineers reviewing the AD7853LAR-REEL datasheet, AD7853LAR-REEL pinout, AD7853LAR-REEL application, or AD7853LAR-REEL equivalent, this page delivers verified electrical specs, validated package mapping, confirmed calibration behavior, real-world timing constraints, and two rigorously cross-checked alternative parts for design-in decisions.
Technical Context
The AD7853LAR-REEL implements a track-and-hold amplifier with 500 ns acquisition time and a SAR ADC core using charge redistribution DAC architecture. Its internal 2.5 V reference is buffered and accessible via REFIN/REFOUT, supporting external overdrive from 1.2 V to AVDD.
Calibration logic includes automatic power-up self-calibration, user-initiated system offset/gain calibration, and configurable power-down modes (full or partial) controlled via PMGT bits in the control register. Serial interface operation is determined by SM1/SM2 pins and supports five distinct modes, including self-clocking (SCLK output) and external-clocking (SCLK input) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.0244% of full-scale range for precise measurement quantization |
| Max Sampling Rate | 100 kSPS - enables real-time capture of signals up to 50 kHz Nyquist bandwidth |
| SNR + THD | 71 dB min - ensures ≥11.8 effective number of bits (ENOB) at 10 kHz input |
| Power Dissipation | 6.85 mW at 3.6 V - supports >100 hr runtime on coin-cell batteries in sleep-integrated systems |
| INL / DNL | ±1 LSB max / ±1 LSB max - guarantees monotonicity and no missing codes across full temperature range |
| Reference Range | 1.2 V to AVDD - allows flexible scaling from low-voltage sensors without external reference ICs |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports both single-ended and differential-sense topologies |
Pinout & Package
AD7853LAR-REEL is housed in a 24-lead SOIC (R-24) package with 0.3-inch width, RoHS-compliant lead finish, and standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Edge-triggered control initiating track-to-hold transition and conversion start; tied high if unused |
| 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 except calibration memory; retains calibration data during sleep |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external reference from 1.2 V to AVDD; requires CREF1/CREF2 decoupling |
| AIN(+), AIN(–) | Pseudo-Differential Analog Inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) must be biased per AMODE setting |
| AMODE | Analog Input Range Select | Logic 0 = unipolar (0 to VREF); Logic 1 = bipolar (±VREF/2); determines input voltage constraints |
| CLKIN | Master Clock Input | 1 MHz max for AD7853L - sets conversion time (10 µs) and calibration duration (31.25 ms typical) |
| SCLK, DIN, DOUT, SYNC | Serial Interface Signals | Configurable SPI-compatible port; SCLK direction (input/output) depends on SM1/SM2 mode selection |
Key Features
| Feature | Design Value |
|---|---|
| Autocalibration on Power-Up | Eliminates manual calibration step at boot; completes full self-calibration in 31.25 ms with 1 MHz CLKIN |
| Flexible Power Management | Three states: normal (6.85 mW), partial power-down (400 µA), full power-down (5 µA with clock off) |
| Pseudo-Differential Input Architecture | Rejects common-mode noise on AIN(+) and AIN(–); supports rail-to-rail input with programmable bias |
| Read-Only Operation Mode | Operates without writing to control register - simplifies firmware integration and reduces BOM count |
| Wide Supply Range Support | Functions identically across 3.0 V to 5.5 V AVDD/DVDD - enables direct use with Li-ion, USB, or regulated 3.3 V rails |
Applications
| Portable Medical Sensors | 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 12-bit sampling ADC acquiring analog front-end outputs at 100 kSPS with synchronized sleep cycles. Use Value: 6.85 mW power dissipation and automatic power-down after conversion extend battery life while maintaining 71 dB SNR+THD fidelity. |
Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in remote field nodes powered by AA batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC triggered by microcontroller wake-up events; performs single-shot conversions with <500 ns acquisition. Use Value: 5 µA full power-down current and 1.2 V–AVDD reference flexibility enable multi-year operation without recalibration. |
| Industrial Handheld Testers | Pen-Based Human Interface Devices |
Use Scenario: Precision multimeter modules requiring accurate DC voltage/current measurement with auto-ranging. IC Role / Device Role / Timing Role: System-calibrated ADC accepting external references for traceable metrology-grade readings. Use Value: ±1 LSB INL and system calibration support (±0.05 × VREF offset span) ensure <0.05% full-scale accuracy across temperature. |
Use Scenario: Digitizing stylus position and pressure in pen computers with low-latency analog sensing. IC Role / Device Role / Timing Role: High-speed track-and-hold front-end feeding SAR core; supports burst-mode sampling during pen contact. Use Value: 500 ns acquisition time and 100 kSPS throughput enable sub-millisecond response to pen movement without aliasing. |
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-REEL | 12-bit, 1 MSPS, 3.6 mW @ 3 V; no internal reference; requires external REF; 10-lead MSOP | Higher speed but lacks on-chip reference and calibration; needs additional passive components | Choose when sampling rate >100 kSPS is required and board space permits external reference design |
| ADS7822U | 12-bit, 200 kSPS, 5.5 mW @ 3 V; internal 2.5 V ref; SPI-only interface; 8-pin SOIC | Faster than AD7853LAR-REEL but no system calibration; limited to unipolar input only | Choose for cost-sensitive, space-constrained designs where bipolar input and calibration are not needed |
Compared with AD7853LAR-REEL, AD7476AARMZ-REEL trades integrated calibration and reference for higher speed and smaller footprint, while ADS7822U offers faster throughput in a smaller package but omits bipolar input support and system-level calibration capability - making AD7853LAR-REEL uniquely suited for portable precision instruments requiring guaranteed linearity and autonomous calibration.
Availability
AD7853LAR-REEL is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, industrial handheld testers, and pen-based human interface devices requiring stable component supply across long production lifecycles.
Supply support for AD7853LAR-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 Norwood, MA.
The AD7853L series belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in portable and energy-constrained systems where calibration autonomy and supply flexibility are critical.
FAQ
What is the maximum sampling rate supported by the AD7853LAR-REEL?
The AD7853LAR-REEL supports a maximum sampling rate of 100 kSPS, achieved with a 1 MHz master clock (CLKIN). This rate is fixed for the 'L' variant and is lower than the 200 kSPS capability of the standard AD7853. The conversion time is 10 µs, and the track-and-hold acquisition time is specified at 500 ns, enabling reliable sampling of signals up to 50 kHz bandwidth. AD7853LAR-REEL maintains this performance across its full operating temperature range of –40°C to +85°C.
Does the AD7853LAR-REEL include an internal voltage reference?
Yes, the AD7853LAR-REEL integrates a 2.5 V internal voltage reference accessible via the REFIN/REFOUT pin. It can operate with this internal reference or accept an external reference from 1.2 V to AVDD. When using the internal reference, external capacitors CREF1 (0.1 µF) and CREF2 (0.01 µF) must be connected to AGND per the datasheet layout guidelines. The reference exhibits 20 ppm/°C tempco and supports both unipolar (0 to VREF) and bipolar (±VREF/2) input ranges. AD7853LAR-REEL retains this reference functionality in all power modes except full power-down.
How does calibration work on the AD7853LAR-REEL?
The AD7853LAR-REEL supports three calibration types: automatic self-calibration on power-up (triggered by CAL pin rising edge), user-initiated full self-calibration (31.25 ms typical), and system-level offset/gain calibration (3.47 ms and 27.78 ms respectively). Calibration data is retained during SLEEP mode. The device allows system calibration spans of ±0.05 × VREF for offset and ±0.025 × VREF for gain, enabling correction of external sensor and signal-chain errors. All calibration operations are performed autonomously by on-chip logic without host processor intervention. AD7853LAR-REEL uses these capabilities to maintain ±1 LSB INL across temperature and time.
What serial interface protocols does the AD7853LAR-REEL support?
The AD7853LAR-REEL supports SPI, QSPI, and 8051-compatible serial interfaces through five programmable modes selected by SM1 and SM2 pins. It operates with either external clocking (SCLK input) or self-clocking (SCLK output), and supports both MSB-first and LSB-first data ordering. The POLARITY pin configures SCLK idle state (high or low), and SYNC functions as chip select or frame sync depending on mode. All interface modes use 16-bit words: first two bits address internal registers (control, status, calibration), and remaining bits carry data. AD7853LAR-REEL requires no external level-shifting for 3 V or 5 V logic families.
What power-saving features does the AD7853LAR-REEL offer?
The AD7853LAR-REEL provides three power states: normal (6.85 mW at 3.6 V), partial power-down (400 µA), and full power-down (5 µA with external clock disabled). Power state is controlled via PMGT bits in the control register or the SLEEP pin. In full power-down, the internal reference and analog circuitry are disabled, but calibration data remains intact. Automatic power-down activates after each conversion completes, reducing average power in burst-mode applications. AD7853LAR-REEL achieves 1.15 mW typical dissipation at 10 kSPS, making it suitable for multi-year battery operation in remote sensors.
AD7853LAR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7853LAR-REEL FAQ
1.How can I place an order for AD7853LAR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853LAR-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 AD7853LAR-REEL reliable?
The price and inventory of AD7853LAR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853LAR-REEL is usually 5 days.
3.What payment methods are accepted for AD7853LAR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853LAR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853LAR-REEL?
AD7853LAR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853LAR-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 AD7853LAR-REEL?
For technical support, including AD7853LAR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853LAR-REEL requirements.
6.How does Aetrix verify that AD7853LAR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7853LAR-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 AD7853LAR-REEL meets industry standards.
7.What is the process for return or replacement of AD7853LAR-REEL?
All AD7853LAR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7853LAR-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 AD7853LAR-REEL part is unused and in its original packaging.
Return procedure for AD7853LAR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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