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Analog Devices Inc. AD7853LARS-REEL
- Part No.:
- AD7853LARS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7853LARS-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
AD7853LARS-REEL 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, self- and system-calibration, flexible SPI/8051-compatible serial interface, and 24-lead SSOP package - deployed in battery-powered medical instruments and portable data acquisition systems.
For engineers reviewing the AD7853LARS-REEL datasheet, AD7853LARS-REEL pinout, AD7853LARS-REEL application, or AD7853LARS-REEL equivalent, key selection criteria include its 4.5 mW typical power at 3 V, 10 µs max conversion time, ±1 LSB integral nonlinearity, 0–VREF or ±VREF/2 input ranges, and support for software-initiated conversions via control register writes.
Technical Context
The AD7853LARS-REEL implements a SAR architecture with integrated track-and-hold (500 ns acquisition), internal 2.5 V reference (20 ppm/°C tempco), and charge redistribution DAC. Its calibration engine supports automatic power-up self-calibration and user-triggered system offset/gain calibration using external reference voltage spans of ±0.05 × VREF (offset) and ±0.025 × VREF (gain).
Serial communication operates across five 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 precision measurement applications. |
| Sampling Rate | 100 kSPS - supports real-time capture of signals up to 50 kHz Nyquist bandwidth in continuous mode. |
| Power Dissipation | 4.5 mW at 3 V - enables >100-hour operation on coin-cell batteries in portable instrumentation. |
| INL / DNL | ±1 LSB max / ±1 LSB max - guarantees monotonicity and no missing codes over full temperature range. |
| Reference Voltage | 2.5 V internal (REFIN/REFOUT), 1.2 V to VDD externally supported - allows direct use without external reference IC. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - configurable via AMODE pin for sensor signal conditioning flexibility. |
| Conversion Time | 10 µs max (at 1 MHz CLKIN) - defines minimum inter-conversion interval for high-throughput sampling. |
Pinout & Package
AD7853LARS-REEL is housed in a 24-lead SSOP (Shrink Small Outline Package), 0.154-inch body width, with standard JEDEC MS-013AC footprint and moisture sensitivity level MSL-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start Input | Edge-triggered control: rising edge initiates track-to-hold transition and starts conversion sequence. |
| 2 BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking with host MCU. |
| 3 SLEEP | Low-Power Mode Control | Logic low powers down analog/digital circuitry including internal reference while retaining calibration data. |
| 4 REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external 1.2–VDD reference; requires CREF1/CREF2 decoupling caps. |
| 5 AVDD | Analog Supply | +3.0 V to +5.5 V analog rail; must be decoupled separately from DVDD to minimize noise coupling into ADC core. |
| 6,12 AGND | Analog Ground | Dedicated ground return for track-and-hold, DAC, and reference; isolated from DGND to preserve SNR. |
| 9 AIN(+), 10 AIN(–) | Pseudo-Differential Inputs | Support unipolar (0–VREF) or bipolar (±VREF/2) input ranges; AIN(–) biasing required for bipolar mode. |
| 13 AMODE | Analog Range Select | Logic 0 → 0–VREF range; Logic 1 → ±VREF/2 range - configures input scaling without external op-amps. |
| 14 POLARITY | SCLK Idle State Control | Defines active edge of SCLK: logic high → SCLK idles high (active low); logic low → SCLK idles low (active high). |
| 15–16 SM1/SM2 | Serial Interface Mode Select | Set five SPI-compatible modes (e.g., external clock vs. self-clocking, SYNC as CS or frame sync). |
| 17 CAL | Calibration Trigger | Rising edge initiates self- or system-calibration; 10 nF cap to DGND enables auto-cal on power-up. |
| 18 DVDD | Digital Supply | +3.0 V to +5.5 V digital rail; may be tied to AVDD if supply noise is controlled; separate decoupling required. |
| 19 DGND | Digital Ground | Return path for digital I/O; must be connected to AGND at single point near AVDD/DVDD decoupling caps. |
| 20 DOUT | Serial Data Output | 16-bit MSB-first output; three-state controlled by SYNC; compatible with 8051, SPI, and QSPI timing protocols. |
| 21 DIN | Serial Data Input | 16-bit command/data input; bidirectional in self-clocking modes; tied to DGND for read-only operation. |
| 22 CLKIN | Master Clock Input | 1 MHz (–40°C to +85°C) or 1.8 MHz (0°C to +70°C) - sets conversion/calibration timing; duty cycle 40/60–60/40. |
| 23 SCLK | Serial Clock I/O | Configured as input or output per SM1/SM2; frequency ≤4 MHz in external-clock modes; derived from CLKIN in self-clocking. |
| 24 SYNC | Frame Sync / Chip Select | Level-sensitive control: acts as chip select (mode 1–3) or frame sync (mode 4–5); asserts DOUT/DIN tristate when low. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Calibration on Power-Up | Internal logic triggers full self-calibration at startup when 10 nF capacitor connects CAL to DGND - eliminates manual calibration step in embedded firmware. |
| Flexible Power Management | Three sleep states: full power-down (5 µA), partial power-down (200 µA), and normal mode (1.9 mA @ 3 V) - selectable via control register PMGT bits. |
| Pseudo-Differential Input Architecture | Accepts true differential signals (±VREF/2) or single-ended inputs (0–VREF) with common-mode rejection - reduces need for external signal conditioning circuitry. |
| Wide Reference Voltage Range | Operates with external references from 1.2 V to VDD - supports low-voltage sensor interfaces and mixed-supply systems without level-shifting. |
| Read-Only Operation Mode | No register writes needed: defaults to functional ADC upon power-up; DIN tied to DGND enables immediate conversion with CONVST only. |
Applications
| Battery-Powered Medical Instrumentation | Portable Data Acquisition Systems |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors powered by Li-ion cells. IC Role / Device Role / Timing Role: Primary 12-bit ADC acquiring analog front-end signals at 100 kSPS with <10 µs conversion latency. Use Value: 4.5 mW power at 3 V extends battery life beyond 120 hours; on-chip calibration maintains accuracy across clinical temperature range (0°C to +50°C). |
Use Scenario: Multi-channel environmental sensor hub logging temperature, pressure, and humidity in field-deployed IoT nodes. IC Role / Device Role / Timing Role: Central sampling engine interfacing to multiple transducer signal chains via multiplexed AIN(+) and AIN(–) inputs. Use Value: Configurable unipolar/bipolar input ranges accommodate diverse sensor outputs; SPI compatibility simplifies integration with ARM Cortex-M0+ MCUs. |
| Industrial Handheld Test Equipment | Pen-Based Computing Interfaces |
Use Scenario: Portable multimeter capturing AC/DC voltage, current, and resistance measurements with autoranging. IC Role / Device Role / Timing Role: Precision ADC providing calibrated 12-bit results for display and storage; uses system calibration with external reference for traceable metrology. Use Value: ±1 LSB INL ensures accurate digitization across full scale; 2.5 V internal reference eliminates need for external voltage reference IC. |
Use Scenario: Digitizing analog stylus position and pressure signals in pen-enabled tablet PCs. IC Role / Device Role / Timing Role: High-speed sampling ADC synchronizing with touch controller timing to capture rapid pen movement without aliasing. Use Value: 500 ns track-and-hold acquisition captures fast transient stylus events; low 1.15 mW power-down mode conserves energy between strokes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, low-power SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, 2.7–5.25 V supply, SPI interface, no internal reference - requires external 2.5 V reference. | Higher speed but lacks auto-calibration and internal reference; better suited for fixed-supply industrial PLC modules. | Select ADS7822U when throughput >100 kSPS is mandatory and board space allows external reference + decoupling. |
| MAX1113ECM+ | 12-bit, 100 kSPS, 2.7–3.6 V supply only, internal 2.048 V reference, SPI-compatible, 10-pin µMAX package. | Narrower supply range and lower reference voltage limit dynamic range; smaller footprint but no system calibration capability. | Select MAX1113ECM+ for ultra-compact 3.3 V-only designs where ±1 LSB INL and full calibration are not required. |
Compared with ADS7822U and MAX1113ECM+, the AD7853LARS-REEL uniquely combines internal 2.5 V reference, auto-calibration on power-up, system calibration support, and wide 3–5.5 V supply range - making it optimal for portable, battery-operated systems requiring long-term accuracy without firmware calibration overhead.
Availability
AD7853LARS-REEL is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, portable data acquisition systems, industrial handheld test equipment, and pen-based computing interfaces requiring stable component supply and long-lifecycle availability.
Supply support for AD7853LARS-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 AD7853LARS-REEL belongs to Analog Devices' legacy precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in portable and embedded systems where calibration integrity and supply flexibility are critical.
FAQ
What is the maximum sampling rate of the AD7853LARS-REEL?
The AD7853LARS-REEL achieves a maximum throughput rate of 100 kSPS under specified conditions (1 MHz CLKIN, –40°C to +85°C). This corresponds to a minimum conversion time of 10 µs. The device maintains this rate across its full operating temperature range and supports continuous sampling with proper BUSY-handling or software-controlled timing via the control register.
Does the AD7853LARS-REEL require an external reference voltage?
No - the AD7853LARS-REEL integrates a 2.5 V internal reference with 20 ppm/°C tempco, accessible at the REFIN/REFOUT pin. It also supports external references from 1.2 V to VDD, enabling flexibility in systems with existing precision references. When using the internal reference, 0.1 µF (CREF1) and 0.01 µF (CREF2) ceramic capacitors must be connected to AGND as specified.
How does the AD7853LARS-REEL handle calibration?
The AD7853LARS-REEL supports automatic self-calibration on power-up (via 10 nF cap on CAL pin) and user-initiated system calibration (offset/gain) using external reference voltage spans of ±0.05 × VREF and ±0.025 × VREF. Calibration data is retained during SLEEP mode. No external components are required beyond the CREF1/CREF2 capacitors for reference stability.
What serial interface protocols does the AD7853LARS-REEL support?
The AD7853LARS-REEL supports five configurable serial interface modes selected by SM1/SM2 pins, compatible with 8051, SPI, and QSPI controllers. It operates with either external SCLK (input) or self-clocking (SCLK output), and SYNC functions as chip select or frame sync depending on mode. POLARITY pin selects SCLK idle state, ensuring robust timing alignment with diverse host processors.
What is the power consumption of the AD7853LARS-REEL in sleep mode?
In full power-down sleep mode with external clock disabled, the AD7853LARS-REEL draws just 5 µA max at 3.6 V (typically 1 µA). With external clock enabled, sleep current is 10 µA typ at 5.5 V or 400 µA typ in partial power-down. Sleep mode retains calibration data and resumes normal operation within microseconds after SLEEP pin returns high.
AD7853LARS-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:
- 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-REEL FAQ
1.How can I place an order for AD7853LARS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853LARS-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 AD7853LARS-REEL reliable?
The price and inventory of AD7853LARS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853LARS-REEL is usually 5 days.
3.What payment methods are accepted for AD7853LARS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853LARS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853LARS-REEL?
AD7853LARS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853LARS-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 AD7853LARS-REEL?
For technical support, including AD7853LARS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853LARS-REEL requirements.
6.How does Aetrix verify that AD7853LARS-REEL is sourced from the original manufacturer or authorized distributors?
All AD7853LARS-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 AD7853LARS-REEL meets industry standards.
7.What is the process for return or replacement of AD7853LARS-REEL?
All AD7853LARS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7853LARS-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 AD7853LARS-REEL part is unused and in its original packaging.
Return procedure for AD7853LARS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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