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Analog Devices Inc. AD7853AN
- Part No.:
- AD7853AN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7853AN.pdf
- Description:
- IC ADC 12BIT SRL 200KSPS 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
AD7853AN 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, flexible SPI/8051-compatible serial interface, and 24-pin PDIP package. Used in battery-powered instrumentation requiring high accuracy and low power.
For engineers reviewing the AD7853AN datasheet, AD7853AN pinout, AD7853AN application, or AD7853AN equivalent, this page delivers verified technical context, real-world timing behavior, calibrated DC accuracy (±1 LSB INL), dynamic performance (71 dB SNR), and validated alternative options for portable and embedded data acquisition systems.
Technical Context
The AD7853AN implements a charge redistribution SAR architecture with integrated track-and-hold (500 ns acquisition), internal 2.5 V reference, and programmable analog input ranges (0 to VREF or ±VREF/2). Calibration logic supports automatic power-up self-calibration and user-initiated system calibration via the CAL pin.
Its serial interface supports five modes (SM1/SM2 configurable), including external-clock and self-clocking operation, with POLARITY-selectable SCLK edge triggering. Conversion is initiated by CONVST or software write, and BUSY indicates active conversion or calibration state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precise sensor digitization |
| Throughput Rate | 200 kSPS - enables real-time sampling of audio-band and control-loop signals |
| INL / DNL | ±1 LSB max / ±1 LSB max - guarantees monotonicity and no missing codes across temperature |
| SNR | 71 dB min at 10 kHz input - supports >11.5 effective bits for clean signal capture |
| Power Dissipation | 20 mW at 3.6 V - balances speed and efficiency for 3 V–5 V battery-operated designs |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - configurable via AMODE pin for flexible signal conditioning |
| Reference | Internal 2.5 V ±20 ppm/°C - eliminates external reference need while maintaining stability over temperature |
Pinout & Package
AD7853AN is supplied in a 24-lead plastic dual-in-line package (N-24), 0.3 inch wide, with through-hole mounting and standard DIP footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start input | Edge-triggered command to latch analog input and begin conversion; required for hardware-started acquisition |
| 2 BUSY | Conversion status output | Active-high open-drain signal indicating ongoing conversion or calibration; used for polling or interrupt generation |
| 3 SLEEP | Power-down control | Logic-low entry into low-power mode (5 µA typical); retains calibration data and exits automatically on next CONVST or CAL |
| 4 REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference output or accepts external 1.2 V–VDD reference; requires CREF1/CREF2 decoupling |
| 9 AIN(+), 10 AIN(–) | Pseudo-differential analog inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) must be biased appropriately per AMODE setting |
| 11 NC | No-connect | Internally unconnected; must remain floating or grounded per layout best practice |
| 13 AMODE | Analog range select | Logic-0 selects 0 to VREF; Logic-1 selects ±VREF/2 - determines input voltage translation and coding format |
| 14 POLARITY | SCLK idle state control | Defines active SCLK edge: Logic-1 → SCLK idles high (active low), Logic-0 → idles low (active high) |
| 15 SM1, 16 SM2 | Serial interface mode select | Configure among five SPI/8051/QSPI-compatible protocols including external clock, self-clock, and frame-sync modes |
| 17 CAL | Calibration trigger | Rising-edge initiates full self-calibration; optional 10 nF capacitor to DGND enables auto-cal on power-up |
| 20 DOUT, 21 DIN | Serial data I/O | 16-bit MSB-first interface; DIN functions as input or bidirectional depending on selected serial mode |
| 22 CLKIN | Master clock input | 4 MHz nominal clock sets conversion time (4.6 µs) and calibration duration; tolerant of 500 kHz–4 MHz range |
| 23 SCLK | Serial clock | Configured as input or output based on SM1/SM2; frequency up to 4 MHz in external-clock modes |
| 24 SYNC | Frame synchronization | Functions as chip-select input or frame-sync output depending on serial mode; enables multi-device daisy-chaining |
Key Features
| Feature | Design Value |
|---|---|
| Automatic power-up self-calibration | Eliminates manual calibration step and ensures ±1 LSB INL without external intervention at startup |
| Flexible serial interface (5 modes) | Interoperates with 8051, SPI, QSPI, and μP controllers without protocol translation hardware or firmware overhead |
| Configurable analog input ranges | Single pin (AMODE) switches between unipolar 0–VREF and bipolar ±VREF/2, supporting both sensor and AC-coupled signals |
| Low-power sleep mode | Reduces current to 5 µA (typ) with external clock off - extends battery life in intermittent-sampling applications |
| Integrated 2.5 V reference | Removes need for external precision reference; tempco of 20 ppm/°C maintains accuracy across –40°C to +85°C |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Digitizing ECG, pulse oximetry, or temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing physiological waveforms at ≤200 kSPS with calibrated DC accuracy. Use Value: ±1 LSB INL and 71 dB SNR ensure clinical-grade fidelity; 20 mW power enables >24-hour operation on two AA cells. |
Use Scenario: Recording environmental parameters (voltage, current, humidity) in remote field sensors with infrequent wake-ups. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by microcontroller for burst sampling, then returning to 5 µA sleep mode. Use Value: SLEEP pin control and auto-calibration preserve measurement integrity across thermal cycles without host intervention. |
| Industrial Control Loop Monitoring | High-Speed Modem Analog Front-End |
|
Use Scenario: Sampling feedback signals (motor current, position encoder, pressure transducer) in closed-loop PLC modules. IC Role / Device Role / Timing Role: High-speed, deterministic ADC interfaced via SPI to real-time MCU for sub-5 µs loop latency. Use Value: 4.6 µs conversion time and BUSY-driven synchronization enable tight control timing; 0–VREF range matches industrial 0–5 V standards. |
Use Scenario: Converting baseband analog signals in legacy 56 kbps modems or fax systems with strict THD requirements. IC Role / Device Role / Timing Role: Precision ADC handling voice-band signals (300 Hz–3.4 kHz) with –78 dB THD and minimal intermodulation. Use Value: –78 dB THD and –78 dB IMD meet ITU-T V.22/V.32 linearity specs; bipolar mode supports AC-coupled signal paths. |
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 |
|---|---|---|---|
| AD7853BN | Same package and pinout; improved ±0.5 LSB INL (B grade) at 5 V supply only | Preferred where tighter DC accuracy is required in fixed 5 V systems; not rated for 3 V operation | Select AD7853BN when 5 V rail is stable and ±0.5 LSB INL is mandatory; AD7853AN remains optimal for 3 V–5.5 V flexibility |
| AD7853LAN | Lower 100 kSPS throughput, 6.85 mW power at 3.6 V, identical pinout and calibration features | Targeted for ultra-low-power, lower-bandwidth applications such as static sensor monitoring | Choose AD7853LAN when sampling rate ≤100 kSPS suffices and sub-7 mW operation is critical; AD7853AN delivers 2× speed at modest power cost |
Compared with AD7853BN and AD7853LAN, the AD7853AN uniquely balances 200 kSPS speed, ±1 LSB INL across 3 V–5.5 V, and DIP-package availability-making it the default choice for general-purpose, mixed-supply, medium-speed data acquisition where calibration robustness and layout simplicity are prioritized.
Availability
AD7853AN is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial control loop monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7853AN 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 AD7853 family was designed for portable, low-power, high-accuracy data acquisition in battery-constrained environments-emphasizing integrated calibration, flexible supply operation, and robust serial interfacing without external support components.
FAQ
What is the maximum sampling rate supported by the AD7853AN?
The AD7853AN supports a maximum throughput rate of 200 kSPS under specified conditions (4 MHz CLKIN, VDD = 3.0 V to 5.5 V). This is achieved with a 4.6 µs conversion time and requires proper timing alignment of CONVST, BUSY, and serial interface signals. The AD7853AN maintains this rate across its full operating temperature range of –40°C to +85°C.
Does the AD7853AN require an external reference voltage?
No, the AD7853AN includes an internal 2.5 V reference with ±20 ppm/°C tempco, eliminating the need for an external reference in most applications. However, the REFIN/REFOUT pin can accept an external reference from 1.2 V to VDD if higher precision or different voltage scaling is required. When using the internal reference, CREF1 (0.1 µF) and CREF2 (0.01 µF) capacitors must be connected to AGND.
How does the AD7853AN handle calibration during power-up?
The AD7853AN supports automatic self-calibration on power-up when a 10 nF capacitor is connected between the CAL pin and DGND. This initiates a full self-calibration sequence (~31 ms at 4 MHz CLKIN) that corrects offset and gain errors, ensuring ±1 LSB INL without host processor involvement. If auto-cal is not needed, CAL should be tied to DVDD.
Can the AD7853AN operate from a 3 V supply?
Yes, the AD7853AN is fully specified for operation from 3.0 V to 5.5 V on both AVDD and DVDD. At 3 V, it delivers 20 mW power dissipation, ±1 LSB INL, and 200 kSPS throughput. All logic thresholds, reference behavior, and timing parameters are guaranteed across this range, making it ideal for single-cell Li-ion or dual-cell alkaline systems.
What serial interface protocols does the AD7853AN support?
The AD7853AN supports five configurable serial interface modes via SM1 and SM2 pins, compatible with 8051, SPI, QSPI, and generic microprocessor buses. Modes include external-clock read/write, self-clocking output, and frame-sync configurations. POLARITY pin selects SCLK idle state, enabling interoperability with diverse controller peripherals without level-shifting or protocol adaptation.
AD7853AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7853AN FAQ
1.How can I place an order for AD7853AN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853AN 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 AD7853AN reliable?
The price and inventory of AD7853AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853AN is usually 5 days.
3.What payment methods are accepted for AD7853AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853AN?
AD7853AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853AN 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 AD7853AN?
For technical support, including AD7853AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853AN requirements.
6.How does Aetrix verify that AD7853AN is sourced from the original manufacturer or authorized distributors?
All AD7853AN 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 AD7853AN meets industry standards.
7.What is the process for return or replacement of AD7853AN?
All AD7853AN units undergo pre-shipment inspection (PSI). If there is an issue with AD7853AN, 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 AD7853AN part is unused and in its original packaging.
Return procedure for AD7853AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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