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Analog Devices Inc. AD7853ARZ
- Part No.:
- AD7853ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7853ARZ.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,417
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Product details
Overview
AD7853ARZ from Analog Devices is a 12-bit, 200 kSPS pseudo-differential successive-approximation ADC operating from a single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, self- and system-calibration, automatic power-down after conversion (25 mW), and SPI/8051/QSPI-compatible serial interface. Used in battery-powered instrumentation requiring high accuracy and low power at moderate sampling rates.
For engineers reviewing the AD7853ARZ datasheet, AD7853ARZ pinout, AD7853ARZ application, or AD7853ARZ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply support for industrial embedded and portable medical designs.
Technical Context
The AD7853ARZ implements a SAR architecture with integrated track-and-hold (500 ns acquisition), internal 2.5 V reference (±20 ppm/°C tempco), and flexible analog input modes (0 to VREF unipolar or ±VREF/2 bipolar) selected via AMODE pin. Calibration logic supports both on-chip self-calibration (typ. 31.25 ms at 4 MHz CLKIN) and external system calibration using CAL pin trigger.
Its serial interface operates in five configurable modes (SM1/SM2 controlled), supporting external clock (SCLK input) or self-clocking (SCLK output), with POLARITY pin selecting SCLK idle state. BUSY signal asserts during conversion or calibration; SYNC serves as frame sync or chip select depending on mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precision measurement |
| Sampling Rate | 200 kSPS - supports real-time capture of signals up to 100 kHz Nyquist bandwidth |
| SNR + Distortion | 71 dB min - enables >11.5 ENOB for clean digitization of audio and sensor signals |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and <0.025% transfer function error across full scale |
| Power Dissipation | 20 mW max at 5.5 V - balances speed and efficiency for portable systems with thermal constraints |
| Reference Voltage | 2.5 V internal - eliminates need for external reference; stable over temperature (20 ppm/°C) |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - configurable via AMODE pin for sensor polarity flexibility |
Pinout & Package
AD7853ARZ is housed in a 24-lead SOIC (R-24) package with 0.3-inch width and standard JEDEC MS-013 footprint. Pin 11 is NC (no connect); AGND appears on pins 6 and 12 for analog ground separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start input | Edge-triggered control: rising edge initiates T/H hold and conversion; unused must tie to DVDD |
| BUSY | Conversion status output | Active-high open-drain signal indicating active conversion or calibration sequence |
| SLEEP | Power management input | Logic 0 enters full power-down (5 µA typ), retaining calibration data; Logic 1 enables normal operation |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external reference up to AVDD; requires CREF1/CREF2 decoupling |
| AIN(+), AIN(–) | Pseudo-differential analog inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) biasing required for bipolar mode |
| AMODE | Analog range select | Logic 0 = unipolar (0 to VREF); Logic 1 = bipolar (±VREF/2); sets input voltage interpretation |
| CAL | Calibration trigger | Rising edge starts self-calibration; internal 0.15 µA pull-up; 10 nF to DGND enables auto-cal on power-up |
| DOUT/DIN/SCLK/SYNC | Serial interface I/O | Configurable SPI-compatible port; SM1/SM2 determine master/slave, clock source, and frame sync behavior |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration on power-up | Eliminates manual calibration step in production; triggered by 10 nF capacitor on CAL pin |
| Flexible power management | Three states: normal (20 mW), partial power-down (400 µA), full power-down (5 µA with clock off) |
| Pseudo-differential input architecture | Rejects common-mode noise while enabling single-ended sensor interfacing without external amplifiers |
| Wide supply range (3 V to 5.5 V) | Operates directly from Li-ion battery (3.0–4.2 V) or 5 V rail without LDO, reducing BOM count |
| On-chip 2.5 V reference | Stable ±20 ppm/°C output removes need for external reference IC and associated layout complexity |
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; synchronized to microcontroller via SPI with BUSY-driven polling. Use Value: 200 kSPS throughput captures 100 Hz bandwidth with oversampling margin; 20 mW power enables extended runtime without thermal throttling. |
Use Scenario: Environmental sensor node measuring temperature, humidity, and pressure over weeks on coin-cell battery. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by microcontroller wake-up; enters full power-down (5 µA) between samples. Use Value: Automatic power-down after conversion reduces average current; internal reference avoids external component drift over temperature. |
| Industrial Control Loop Sampling | High-Speed Modem Analog Front-End |
Use Scenario: Closed-loop motor control requiring precise current sensing and position feedback at 50 kHz update rate. IC Role / Device Role / Timing Role: Dual-channel sampling (via sequential AIN+/AIN− configuration) feeding PID controller; calibrated for long-term gain stability. Use Value: ±1 LSB INL and system calibration capability maintain loop accuracy over temperature and aging without field recalibration. |
Use Scenario: Analog baseband digitization in 56 kbps modem design with strict THD and SNR requirements. IC Role / Device Role / Timing Role: High-fidelity signal capture stage preceding digital signal processing; driven by fixed 4 MHz CLKIN for deterministic timing. Use Value: –78 dB THD and 71 dB SNR+D meet ITU-T V.34 linearity specs; pseudo-differential input suppresses coupling noise from digital sections. |
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 |
|---|---|---|---|
| AD7853BRZ | Same package and pinout; ±0.5 LSB INL (B-grade) vs. ±1 LSB (A-grade); higher accuracy at cost premium | Used where long-term linearity stability over temperature is critical (e.g., calibration equipment) | Select AD7853BRZ when ±0.5 LSB INL is required; otherwise AD7853ARZ offers optimal cost/performance balance |
| AD7853LARZ | Same pinout but lower speed (100 kSPS); reduced power (6.85 mW vs. 20 mW); identical calibration and interface features | Preferred for ultra-low-power applications where 100 kSPS suffices (e.g., wireless sensor nodes) | Choose AD7853LARZ only if sampling rate can be halved to save >65% power; AD7853ARZ retains full 200 kSPS capability |
Compared with AD7853BRZ, AD7853ARZ trades 0.5 LSB linearity for lower cost and broader availability; compared with AD7853LARZ, it doubles throughput at 3× power, making it the default choice for speed-constrained portable instrumentation.
Availability
AD7853ARZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial control loop sampling, and high-speed modem analog front-end designs requiring stable component supply and long-lifecycle support.
Supply support for AD7853ARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD7853 product line delivers precision, low-power, single-supply SAR ADCs optimized for portable and battery-operated instrumentation where calibration integrity, supply flexibility, and serial interface compatibility are essential.
FAQ
What is the maximum sampling rate supported by the AD7853ARZ?
The AD7853ARZ supports a maximum sampling rate of 200 kSPS, achieved with a 4 MHz master clock (CLKIN). This allows accurate digitization of input signals up to 100 kHz (Nyquist limit). The conversion time is fixed at 4.6 µs maximum, and the device maintains this rate across its full operating temperature range (–40°C to +85°C). AD7853ARZ achieves this performance while maintaining 71 dB SNR+D and ±1 LSB INL.
Does the AD7853ARZ require an external reference voltage?
No, the AD7853ARZ includes an internal 2.5 V reference with ±20 ppm/°C temperature coefficient, eliminating the need for an external reference in most applications. The REFIN/REFOUT pin provides this voltage and can be overdriven by an external reference if higher precision or different voltage is required. 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. AD7853ARZ operates reliably with this integrated solution across its 3 V to 5.5 V supply range.
How does the AD7853ARZ handle power management in battery-powered systems?
The AD7853ARZ offers three distinct power states: normal operation (20 mW max), partial power-down (400 µA typ), and full power-down (5 µA typ with external clock off). The SLEEP pin controls entry into low-power modes, and the device automatically enters full power-down after conversion completes unless prevented by register settings. Calibration data is retained in all modes. This enables aggressive duty cycling in battery-powered systems-e.g., waking to sample every second, converting in 4.6 µs, then returning to 5 µA sleep-extending operational life significantly. AD7853ARZ's architecture makes it ideal for portable medical and sensor applications.
Can the AD7853ARZ interface directly with an 8051 microcontroller?
Yes, the AD7853ARZ supports 8051-compatible serial interface mode (Interface Mode 2 per datasheet Table X), using standard 8051 timing and signal conventions. In this mode, SCLK is driven externally, SYNC acts as frame sync, and DOUT/DIN operate in half-duplex with proper timing alignment. No level-shifting is required for 3 V or 5 V 8051 systems, as AD7853ARZ logic thresholds are specified for both supply ranges (e.g., VINH = 2.1 V min at 3 V). The part powers up ready for read-only operation, simplifying integration. AD7853ARZ's native compatibility reduces firmware overhead versus bit-banged solutions.
What calibration options are available on the AD7853ARZ?
The AD7853ARZ provides both self-calibration (on-chip DAC and logic) and system calibration (external reference and signal path). Self-calibration corrects offset and gain errors using internal circuitry and takes ~31.25 ms at 4 MHz CLKIN; it can be triggered manually via the CAL pin or automatically on power-up using a 10 nF capacitor. System calibration allows correction of external front-end errors (e.g., sensor amplifier gain/offset) by applying known references to AIN(+) and AIN(–). Both methods store results in on-chip registers and remain valid across power cycles. AD7853ARZ's dual calibration capability ensures long-term accuracy in field-deployed equipment.
AD7853ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- 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:
- -
AD7853ARZ FAQ
1.How can I place an order for AD7853ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853ARZ 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 AD7853ARZ reliable?
The price and inventory of AD7853ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853ARZ is usually 5 days.
3.What payment methods are accepted for AD7853ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853ARZ?
AD7853ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853ARZ 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 AD7853ARZ?
For technical support, including AD7853ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853ARZ requirements.
6.How does Aetrix verify that AD7853ARZ is sourced from the original manufacturer or authorized distributors?
All AD7853ARZ 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 AD7853ARZ meets industry standards.
7.What is the process for return or replacement of AD7853ARZ?
All AD7853ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853ARZ, 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 AD7853ARZ part is unused and in its original packaging.
Return procedure for AD7853ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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