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Analog Devices Inc. AD7853ANZ
- Part No.:
- AD7853ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7853ANZ.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
AD7853ANZ 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 integrates on-chip 2.5 V reference, self/system calibration, and SPI/8051-compatible serial interface. Designed for portable instrumentation, it delivers ±1 LSB integral nonlinearity, 70 dB SNR at 10 kHz input, and 4.6 µs conversion time with 12 mW power dissipation at 3 V.
For engineers reviewing the AD7853ANZ datasheet, AD7853ANZ pinout, AD7853ANZ application, or AD7853ANZ equivalent, this page provides verified technical context, calibrated DC and dynamic performance data, package-specific pin mapping, real-world use cases in battery-powered systems, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The AD7853ANZ employs 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). Its calibration memory retains offset/gain coefficients across power cycles.
It supports five serial interface modes via SM1/SM2 pins, including external-clock (SCLK input) and self-clocking (SCLK output) configurations, with POLARITY pin selecting SCLK idle state. Conversion is initiated by CONVST edge or software write to control register.
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 sampling of signals up to 100 kHz Nyquist bandwidth without aliasing |
| INL / DNL | ±1 LSB max - guarantees monotonicity and no missing codes over temperature |
| SNR | 70 dB min at 10 kHz - supports >11.3 effective bits for high-fidelity signal capture |
| Power Dissipation | 12 mW at 3 V - enables continuous operation in handheld medical instruments with 20+ hour battery life |
| Reference Voltage | 2.5 V internal - eliminates need for external reference IC, reducing BOM count and layout area |
| Supply Range | 3.0 V to 5.5 V - interoperable with Li-ion (3.0–4.2 V) and 5 V logic rails without level-shifting |
Pinout & Package
AD7853ANZ is supplied in a 24-lead plastic DIP (N-24) package with 0.3-inch width, through-hole mounting, and industry-standard pin spacing compatible with prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start Input | Edge-triggered command initiating track-to-hold transition and conversion sequence |
| 2 BUSY | Conversion Status Output | Active-high open-drain signal indicating ongoing conversion or calibration |
| 3 SLEEP | Power-Down Control | Logic low disables all circuitry including internal reference, reducing current to 5 µA |
| 4 REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external reference up to AVDD for improved accuracy |
| 5 AVDD | Analog Supply | +3.0 V to +5.5 V analog rail powering SAR core, T/H, and reference circuitry |
| 6, 12 AGND | Analog Ground | Dedicated ground return for analog signal path to minimize noise coupling into conversion |
| 7 CREF1 | Reference Decoupling | Connects 0.1 µF ceramic capacitor to AGND to stabilize DAC charge redistribution |
| 8 CREF2 | Reference Filtering | Connects 0.01 µF ceramic capacitor to AGND to suppress high-frequency reference noise |
| 9 AIN(+) | Positive Analog Input | Pseudo-differential input; voltage must stay within AGND to AVDD and ≥ AIN(–) in unipolar mode |
| 10 AIN(–) | Negative Analog Input | Common-mode reference point; biased to +VREF/2 in bipolar mode for ±VREF/2 range |
| 11 NC | No Connect | Internally unconnected; must remain floating per datasheet |
| 13 AMODE | Analog Range Select | Logic 0 = 0 to VREF unipolar; Logic 1 = ±VREF/2 bipolar - configures input scaling and coding |
| 14 POLARITY | SCLK Idle State | Logic 1 = SCLK idles high; Logic 0 = SCLK idles low - determines active clock edge for serial I/O |
| 15 SM1 / 16 SM2 | Serial Interface Mode | Two-pin encoding selects among 5 SPI/8051/QSPI-compatible protocols including self-clocking |
| 17 CAL | Calibration Trigger | Rising edge initiates self-calibration; 10 nF to DGND enables automatic power-up calibration |
| 18 DVDD | Digital Supply | +3.0 V to +5.5 V digital rail powering serial interface and control logic |
| 19 DGND | Digital Ground | Separate ground return for digital I/O to prevent switching noise from corrupting analog conversion |
| 20 DOUT | Serial Data Output | 16-bit MSB-first output carrying conversion result or register readback |
| 21 DIN | Serial Data Input | 16-bit MSB-first input for writing to control/calibration registers; tri-stated when not active |
| 22 CLKIN | Master Clock Input | 4 MHz input synchronizing conversion timing, calibration duration, and internal logic |
| 23 SCLK | Serial Clock | Configurable as input (external clock) or output (self-clocking); frequency derived from CLKIN |
| 24 SYNC | Frame Sync I/O | Configurable as chip-select input or frame-sync output depending on SM1/SM2 mode |
Key Features
| Feature | Design Value |
|---|---|
| System + Self-Calibration | On-chip calibration memory retains coefficients across power cycles, enabling drift-free operation over temperature and time without host intervention |
| Flexible Serial Interface | Five configurable modes support SPI, QSPI, 8051, and µP buses - eliminates need for protocol translation logic in microcontroller-based designs |
| Automatic Power-Down | Enters 5 µA sleep mode automatically after conversion completes, reducing average power in burst-sampling applications |
| Pseudo-Differential Input | Rejects common-mode noise on AIN(+) and AIN(–) while supporting both unipolar (0 to VREF) and bipolar (±VREF/2) signal ranges |
| Integrated 2.5 V Reference | Eliminates external reference IC and associated decoupling components, saving board space and cost in space-constrained portable systems |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Digitizing ECG, pulse oximetry, or glucose sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring physiological waveforms at 100–200 Hz with <1 LSB linearity error. Use Value: 12-bit resolution and ±1 LSB INL ensure accurate amplitude measurement of low-voltage bio-signals; 12 mW power enables multi-day operation on coin-cell batteries. |
Use Scenario: Capturing temperature, humidity, and pressure sensor data in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-power sampling ADC triggered by microcontroller wake-up events to minimize system energy consumption. Use Value: Automatic power-down reduces quiescent current to 5 µA between samples; internal reference eliminates calibration drift across wide temperature ranges. |
| Industrial Handheld Testers | Pen-Based Computing Interfaces |
|
Use Scenario: Measuring voltage, current, and resistance in portable multimeters and clamp meters. IC Role / Device Role / Timing Role: High-accuracy ADC with system calibration capability compensating for sensor and signal-chain offsets. Use Value: On-chip system calibration allows field adjustment of gain/offset errors introduced by external op-amps and resistive dividers, maintaining accuracy without factory recalibration. |
Use Scenario: Converting stylus tip position and pressure signals in pen-enabled PDAs and signature pads. IC Role / Device Role / Timing Role: Fast 200 kSPS ADC capturing rapid pen movement with minimal latency for responsive user interaction. Use Value: 4.6 µs conversion time and 500 ns track/hold acquisition enable sub-millisecond sampling of dynamic pen motion, preserving gesture fidelity. |
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 |
|---|---|---|---|
| AD7853LNZ | Same pinout and interface, but rated for 100 kSPS and 6.85 mW at 3 V - lower speed, 43% less power than AD7853ANZ | Optimized for ultra-low-power applications where throughput >100 kSPS is unnecessary, e.g., slow-scan sensors | Select AD7853LNZ when battery life is prioritized over sampling rate; verify timing margins for 100 kSPS system requirements |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, 2.7–5.25 V supply, no internal reference - requires external 2.5 V reference and decoupling | Used in cost-sensitive industrial controls where external reference improves long-term stability beyond internal 2.5 V option | Select ADS7822U when higher reference accuracy or flexibility is required; accept added BOM cost and layout complexity |
Compared with AD7853LNZ and ADS7822U, the AD7853ANZ uniquely combines 200 kSPS throughput, integrated 2.5 V reference, and system calibration in a DIP package - making it optimal for legacy-compatible, medium-speed, self-contained analog acquisition where board space and calibration simplicity are critical.
Availability
AD7853ANZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial handheld testers requiring stable component supply and long-term obsolescence management.
Supply support for AD7853ANZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7853ANZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for portable, low-power, high-accuracy data acquisition systems where integration, calibration autonomy, and supply flexibility are essential.
FAQ
What is the maximum sampling rate supported by the AD7853ANZ?
The AD7853ANZ supports a maximum throughput rate of 200 kSPS, achieved with a 4 MHz master clock (CLKIN). This corresponds to a minimum conversion time of 4.6 µs and enables accurate digitization of input signals up to 100 kHz under Nyquist criteria. The part maintains specified DC accuracy and dynamic performance (70 dB SNR) at this rate when using the internal 2.5 V reference and proper external decoupling capacitors on CREF1 and CREF2.
Does the AD7853ANZ require an external reference voltage?
No, the AD7853ANZ does not require an external reference voltage because it integrates a 2.5 V internal reference that appears on the REFIN/REFOUT pin. This reference is factory-trimmed and stable over temperature (20 ppm/°C typical). However, the pin can be overdriven with an external reference from 1.2 V to AVDD if higher accuracy or different voltage scaling is needed - in which case CREF1 and CREF2 must still be populated per the datasheet.
How does the AD7853ANZ handle power management in portable applications?
The AD7853ANZ implements three power states: normal (12 mW at 3 V), partial power-down (400 µA), and full power-down (5 µA). The SLEEP pin controls entry into low-power modes, and automatic power-down activates after each conversion completes. Calibration data is retained in all modes. This enables burst-sampling architectures where the ADC wakes, converts, transmits data, and returns to 5 µA sleep - extending battery life in handheld medical and test equipment.
Can the AD7853ANZ perform system-level calibration with external components?
Yes, the AD7853ANZ supports system calibration to compensate for gain and offset errors introduced by external signal-conditioning circuitry. Using the CAL pin and control register, users can apply known reference voltages to AIN(+) and AIN(–) and execute system offset and full-scale calibration sequences. The allowable calibration spans are ±0.05 × VREF for offset and ±0.025 × VREF for gain, ensuring robust compensation of front-end amplifier and resistor network errors.
What package type is used for the AD7853ANZ and is it RoHS-compliant?
The AD7853ANZ is packaged in a 24-lead plastic DIP (N-24) with 0.3-inch width, through-hole mounting, and standard lead finish. Per Analog Devices' official product documentation and packaging data, the AD7853ANZ is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU requirements. The device carries the "N" suffix per the ordering guide, confirming the DIP package variant.
AD7853ANZ 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):
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7853ANZ FAQ
1.How can I place an order for AD7853ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853ANZ 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 AD7853ANZ reliable?
The price and inventory of AD7853ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853ANZ is usually 5 days.
3.What payment methods are accepted for AD7853ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853ANZ?
AD7853ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853ANZ 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 AD7853ANZ?
For technical support, including AD7853ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853ANZ requirements.
6.How does Aetrix verify that AD7853ANZ is sourced from the original manufacturer or authorized distributors?
All AD7853ANZ 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 AD7853ANZ meets industry standards.
7.What is the process for return or replacement of AD7853ANZ?
All AD7853ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853ANZ, 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 AD7853ANZ part is unused and in its original packaging.
Return procedure for AD7853ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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