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Analog Devices Inc. AD7853ARSZ
- Part No.:
- AD7853ARSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7853ARSZ.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
AD7853ARSZ 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, featuring on-chip 2.5 V reference, self-calibration, and SPI/8051-compatible serial interface. It delivers 71 dB SNR, ±1 LSB integral nonlinearity, and 4.6 µs conversion time for high-accuracy data acquisition in portable instrumentation and battery-powered systems.
For engineers reviewing the AD7853ARSZ datasheet, AD7853ARSZ pinout, AD7853ARSZ application, or AD7853ARSZ equivalent, this page provides verified technical context, real-world timing constraints, calibrated DC accuracy specs, package-specific layout guidance, and validated alternative options for system-level design trade-offs.
Technical Context
The AD7853ARSZ integrates a track-and-hold amplifier with 500 ns acquisition time, SAR architecture with charge redistribution DAC, and dual-domain power management (AVDD/DVDD). Its calibration engine supports automatic power-up self-calibration and user-initiated system calibration with ±0.05 × VREF offset span and ±0.025 × VREF gain adjustment range.
Serial communication operates across five interface modes via SM1/SM2 pins, supporting external-clock (SCLK input) and self-clocking (SCLK output) configurations with POLARITY-controlled edge sensitivity. The device uses straight binary or twos-complement coding and accepts analog inputs from 0 V to VREF (unipolar) or ±VREF/2 (bipolar), with AIN(+)–AIN(–) differential range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Throughput Rate | 200 kSPS - enables real-time sampling of signals up to 100 kHz Nyquist bandwidth without aliasing. |
| SNR + Distortion | 71 dB min - ensures ≥11.5 effective bits for precision measurement of low-distortion sine waves at 10 kHz. |
| Integral Nonlinearity | ±1 LSB max - maintains end-point linearity critical for closed-loop control and sensor linearization. |
| Conversion Time | 4.6 µs max - defines minimum inter-conversion interval and sets maximum achievable sample rate. |
| Supply Range | 3.0 V to 5.5 V - allows direct interfacing with 3.3 V or 5 V microcontrollers without level-shifting. |
| Reference Voltage | 2.5 V internal (REFIN/REFOUT) - eliminates need for external reference; supports 1.2 V to VDD external override. |
Pinout & Package
AD7853ARSZ is housed in a 24-lead SSOP (Shrink Small Outline Package) with 0.64 mm pitch, JEDEC MO-153 compliant, footprint compatible with SOIC but 30% smaller area. Thermal resistance θJA = 115°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Rising-edge-triggered command initiating track-to-hold transition and conversion; must meet 100 ns minimum pulse width. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking in polled interfaces. |
| SLEEP | Power-Down Control | Logic-low entry into full-power-down mode (5 µA typical); retains calibration data and exits on logic-high. |
| REFIN/REFOUT | Reference I/O | 2.5 V nominal internal reference source; can be overdriven externally or tied to AVDD for rail-to-rail input scaling. |
| AIN(+), AIN(–) | Pseudo-Differential Inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) biasing required for bipolar mode per AMODE state. |
| DOUT, DIN, SCLK, SYNC | Serial Interface Signals | 16-bit SPI/QSPI/8051-compatible port; SCLK direction (input/output) and SYNC function (CS/frame sync) depend on SM1/SM2 settings. |
| AMODE, POLARITY, SM1, SM2 | Configuration Control | Hardware-selectable analog range, clock polarity, and serial interface mode-eliminates software register writes for basic operation. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration on power-up | Eliminates manual calibration step during boot; completes in 31.25 ms with 4 MHz CLKIN, retaining accuracy over temperature drift. |
| Pseudo-differential input architecture | Rejects common-mode noise on AIN(+) and AIN(–) while enabling flexible unipolar/bipolar signal conditioning without external op-amps. |
| Flexible serial interface modes | Five hardware-configurable modes support SPI master/slave, 8051 parallel emulation, and QSPI timing-no firmware changes needed for protocol adaptation. |
| Low-power operation | 12 mW at 3 V (200 kSPS), dropping to 5 µW in full power-down-enables >100-hour battery life in portable medical sensors. |
| On-chip 2.5 V reference with tempco | 20 ppm/°C drift ensures <±0.5 LSB error contribution over –40°C to +85°C, removing external reference cost and board space. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 3.3 V Li-ion supply. IC Role / Device Role / Timing Role: Primary ADC capturing analog front-end output at 200 kSPS with 12-bit resolution and auto-calibrated DC accuracy. Use Value: Enables clinical-grade signal fidelity (71 dB SNR) and long runtime (12 mW @ 3 V) without external reference or calibration circuitry. |
Use Scenario: Environmental sensor node measuring temperature, humidity, and pressure over multi-day deployments. IC Role / Device Role / Timing Role: Low-power sampling ADC performing burst acquisitions triggered by wake-up timer, then entering 5 µA sleep mode. Use Value: Reduces average system current to <10 µA during idle periods while maintaining ±1 LSB INL for calibrated sensor outputs. |
| Industrial Process Monitoring | High-Speed Modem Analog Front-End |
|
Use Scenario: 4–20 mA loop-powered transmitter digitizing thermocouple or RTD signals in factory automation cabinets. IC Role / Device Role / Timing Role: Precision ADC with system calibration support, accepting bipolar inputs and rejecting common-mode noise on twisted-pair wiring. Use Value: Achieves ±1 LSB INL after field calibration using on-chip gain/offset registers-no recalibration hardware required. |
Use Scenario: DSL or cable modem receiving analog IF signals requiring fast, accurate digitization before digital demodulation. IC Role / Device Role / Timing Role: High-throughput ADC delivering 200 kSPS samples to DSP with minimal latency (4.6 µs conversion). Use Value: Supports real-time signal processing with deterministic timing and 71 dB SNR for clean baseband reconstruction. |
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 |
|---|---|---|---|
| AD7853BR | Same die, SOIC-24 package; ±0.5 LSB INL (B-grade) vs. ±1 LSB (A-grade); identical timing and power specs. | Preferred where tighter DC accuracy is required for calibration-critical instrumentation, with no PCB change needed. | Select AD7853BR if system-level INL budget demands ≤±0.5 LSB and SOIC footprint is acceptable. |
| AD7476AARMZ | 12-bit, 1 MSPS SAR ADC; no internal reference; requires external 2.5 V ref; 3.5 µs conversion; 3.6 mW @ 3 V. | Higher speed but lacks auto-calibration and integrated reference-requires additional components and calibration effort. | Choose AD7476AARMZ only when throughput >200 kSPS is mandatory and board space allows external reference + calibration logic. |
Compared with AD7853ARSZ, AD7853BR offers superior DC accuracy in a larger SOIC package, while AD7476AARMZ trades integration and ease-of-use for raw speed-making AD7853ARSZ optimal for compact, low-maintenance, battery-sensitive designs needing guaranteed 12-bit linearity.
Availability
AD7853ARSZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial process monitoring, and high-speed modem analog front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7853ARSZ 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 AD7853ARSZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in space-constrained, battery-operated, and calibration-sensitive applications.
FAQ
What is the maximum sampling rate supported by the AD7853ARSZ?
The AD7853ARSZ supports a maximum throughput rate of 200 kSPS under standard operating conditions with 4 MHz master clock. This corresponds to a minimum conversion time of 4.6 µs and enables accurate digitization of input signals up to 100 kHz without aliasing. The actual achievable rate depends on interface mode selection and timing margins for serial readout.
Does the AD7853ARSZ require an external reference voltage?
No, the AD7853ARSZ includes an internal 2.5 V reference accessible via the REFIN/REFOUT pin, eliminating the need for an external reference in most applications. It also supports external reference voltages from 1.2 V to AVDD, allowing flexibility for rail-to-rail input scaling or improved system-level accuracy when paired with a precision external reference.
How does the AD7853ARSZ handle power management in battery-powered systems?
The AD7853ARSZ provides three power states: normal operation (12 mW @ 3 V), partial power-down (400 µA), and full power-down (5 µA). The SLEEP pin controls entry/exit, and automatic power-down occurs after each conversion. This enables aggressive duty cycling in battery-powered systems-e.g., waking for 5 µs conversion, then sleeping for 99.9% of the time-to extend operational life significantly.
Can the AD7853ARSZ perform system-level calibration?
Yes, the AD7853ARSZ supports both self-calibration (on power-up or via CAL pin) and system calibration. System calibration corrects for external gain/offset errors using on-chip registers, with allowable spans of ±0.05 × VREF for offset and ±0.025 × VREF for gain. This allows compensation of front-end amplifier errors without modifying hardware.
What serial interface protocols are compatible with the AD7853ARSZ?
The AD7853ARSZ supports SPI, QSPI, and 8051-compatible serial interfaces through five hardware-selectable modes controlled by SM1 and SM2 pins. It operates with either external SCLK (master or slave) or self-clocking (SCLK output), and supports both CPOL=0/1 via the POLARITY pin-ensuring seamless integration with diverse microcontroller platforms without firmware modification.
AD7853ARSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7853ARSZ FAQ
1.How can I place an order for AD7853ARSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853ARSZ 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 AD7853ARSZ reliable?
The price and inventory of AD7853ARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853ARSZ is usually 5 days.
3.What payment methods are accepted for AD7853ARSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853ARSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853ARSZ?
AD7853ARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853ARSZ 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 AD7853ARSZ?
For technical support, including AD7853ARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853ARSZ requirements.
6.How does Aetrix verify that AD7853ARSZ is sourced from the original manufacturer or authorized distributors?
All AD7853ARSZ 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 AD7853ARSZ meets industry standards.
7.What is the process for return or replacement of AD7853ARSZ?
All AD7853ARSZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853ARSZ, 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 AD7853ARSZ part is unused and in its original packaging.
Return procedure for AD7853ARSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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