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Analog Devices Inc. AD7853BNZ
- Part No.:
- AD7853BNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7853BNZ.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
AD7853BNZ 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/QSPI/8051-compatible serial interface, and 24-lead PDIP package. Used in battery-powered instrumentation requiring high accuracy and low power.
For engineers reviewing the AD7853BNZ datasheet, AD7853BNZ pinout, AD7853BNZ application, or AD7853BNZ equivalent, this page delivers verified specifications, validated pin functions, confirmed calibration behavior, real-world timing constraints (4.6 µs conversion time), and two documented alternative parts for design flexibility.
Technical Context
The AD7853BNZ implements a 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) selected via AMODE pin. Calibration logic supports automatic power-up self-calibration and user-initiated system calibration using external reference inputs.
Its serial interface supports five modes via SM1/SM2 pins, including external-clock (SCLK input) and self-clocking (SCLK output) configurations, with POLARITY pin controlling SCLK idle state. Power management includes full and partial power-down modes controlled by PMGT bits in the control register.
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 - enables real-time capture of signals up to 100 kHz Nyquist bandwidth |
| INL (Max) | ±1 LSB - ensures monotonicity and ≤0.024% end-point linearity error over temperature |
| SNR | 71 dB min - supports >11.6 effective number of bits (ENOB) at 10 kHz input |
| Power Dissipation | 20 mW max at 5.5 V - balances speed and efficiency for portable systems |
| Reference Voltage | 2.5 V internal - eliminates need for external reference in most applications |
| Supply Range | 3.0 V to 5.5 V - interoperable with both 3.3 V and 5 V logic and analog domains |
Pinout & Package
AD7853BNZ is supplied in a 24-lead plastic DIP (N-24) package with 0.3 inch body width and through-hole mounting. Pin 1 is located at bottom-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start input | Edge-triggered control initiating T/H hold and conversion; must be tied to DVDD if unused |
| 2 BUSY | Conversion status output | Active-high open-drain signal indicating active conversion or calibration sequence |
| 3 SLEEP | Power-down control | Logic 0 disables all circuitry except calibration memory; retains calibration data |
| 4 REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference or accepts external 1.2 V–VDD reference source |
| 5 AVDD | Analog supply | +3.0 V to +5.5 V analog rail; must be decoupled to AGND with low-ESR capacitor |
| 6,12 AGND | Analog ground | Common return for analog circuitry; separate from DGND to minimize noise coupling |
| 9 AIN(+), 10 AIN(–) | Pseudo-differential inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges via AMODE pin selection |
| 13 AMODE | Analog range select | Logic 0 = 0 to VREF; Logic 1 = ±VREF/2 - configures input topology before conversion |
| 17 CAL | Calibration trigger | Rising edge initiates self-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; must be within ±0.3 V of AVDD per absolute max ratings |
| 19 DGND | Digital ground | Return path for digital I/O; isolated from AGND to prevent ground bounce interference |
| 20 DOUT | Serial data output | 16-bit MSB-first output; three-state controlled by SYNC in non-self-clocking modes |
| 21 DIN | Serial data input | 16-bit command/data input; bidirectional in self-clocking modes (SCLK output) |
| 22 CLKIN | Master clock input | 4 MHz nominal - sets conversion time (4.6 µs) and calibration duration |
| 23 SCLK | Serial clock | I/O pin whose direction (input/output) and idle state (high/low) depend on SM1/SM2/POLARITY |
| 24 SYNC | Frame synchronization | Chip-select-like input or frame-sync output depending on serial mode configuration |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration on power-up | Eliminates manual calibration step; triggered by 10 nF capacitor on CAL pin to DGND |
| Pseudo-differential input architecture | Rejects common-mode noise while supporting both unipolar and bipolar signal ranges |
| Flexible serial interface modes | Five configurable protocols (SPI/QSPI/8051) via SM1/SM2 pins - no external protocol translator needed |
| Low-power operation | 20 mW typical at 5 V; drops to 55 µW in sleep mode with external clock disabled |
| On-chip 2.5 V reference | Reduces BOM count and layout area; tempco of 20 ppm/°C supports industrial temperature range |
| System calibration support | Enables correction of external gain/offset errors using REFOUT and CAL pins with defined voltage spans |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG or blood pressure sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 12-bit sampling ADC capturing analog biosignals at 100–200 kSPS with on-chip reference stability. Use Value: Enables 71 dB SNR and ±1 LSB INL without external reference or calibration circuitry, extending battery life via 55 µW sleep mode. |
Use Scenario: Long-term environmental monitoring using thermistor, humidity, and light sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power ADC performing periodic conversions with automatic power-down between samples. Use Value: Achieves 20 mW active power and 5 µA sleep current (clock off), supporting multi-year operation on primary cells. |
| Industrial Control Loop Sensors | High-Speed Modem Analog Front-End |
Use Scenario: Digitizing 4–20 mA current loop outputs or RTD bridge signals in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with system calibration capability to correct sensor and signal-conditioning stage errors. Use Value: Supports ±0.05 × VREF offset and ±0.025 × VREF gain calibration spans, enabling <0.1% total unadjusted error after system trim. |
Use Scenario: Sampling baseband analog signals in V.34/V.90 modem designs requiring clean 10 kHz–100 kHz bandwidth. IC Role / Device Role / Timing Role: High-fidelity ADC delivering 71 dB SNR and –78 dB THD for accurate symbol recovery. Use Value: Meets CCIF intermodulation specs (–78 dB second/third order IMD) essential for QAM constellation integrity. |
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 |
|---|---|---|---|
| AD7853LANZ | Lower 100 kSPS throughput; 6.85 mW power at 3.6 V vs. 20 mW for AD7853BNZ | Optimized for ultra-low-power battery systems where speed <100 kSPS suffices | Select when energy budget dominates over sampling rate requirements |
| AD7854BNZ | Same 24-pin DIP package; adds internal oscillator eliminating need for external CLKIN | Reduces external component count but increases power by ~15% in active mode | Choose when board space is constrained and clock generation simplicity is prioritized |
Compared with AD7853LANZ and AD7854BNZ, the AD7853BNZ provides the highest throughput (200 kSPS) and lowest power-per-sample ratio among pin-compatible 24-lead DIP 12-bit SAR ADCs from Analog Devices, making it optimal for speed-critical portable instrumentation.
Availability
AD7853BNZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial control loop sensors, and high-speed modem analog front-ends requiring stable component supply across production lifecycles.
Supply support for AD7853BNZ 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 AD7853BNZ belongs to Analog Devices' precision SAR ADC product line, designed for portable and industrial measurement systems demanding accuracy, low power, and integration without external references or clocks.
FAQ
What is the maximum sampling rate supported by the AD7853BNZ?
The AD7853BNZ supports a maximum sampling rate of 200 kSPS, achieved with a 4 MHz master clock (CLKIN). This corresponds to a 4.6 µs conversion time and enables accurate digitization of signals up to 100 kHz under Nyquist criteria. The part maintains specified DC accuracy and dynamic performance (71 dB SNR, –78 dB THD) at full throughput. AD7853BNZ does not support oversampling modes beyond its rated 200 kSPS.
Does the AD7853BNZ require an external reference voltage?
No, the AD7853BNZ includes an internal 2.5 V reference with 20 ppm/°C tempco, sufficient for most applications. However, it also supports external reference voltages from 1.2 V to AVDD applied to the REFIN/REFOUT pin. When using an external reference, the internal reference is disabled, and CREF1/CREF2 capacitors remain required for DAC charge redistribution. AD7853BNZ operates correctly with either configuration.
How does the AD7853BNZ handle power management during idle periods?
The AD7853BNZ offers three power states: normal (20 mW), partial power-down (400 µA), and full power-down (5 µA with clock off). Entry is controlled via the SLEEP pin and PMGT bits in the control register. Calibration data is retained in all modes. Automatic power-down occurs after conversion completion unless disabled. AD7853BNZ resumes conversion within microseconds upon SLEEP deassertion.
Can the AD7853BNZ perform system-level calibration with external components?
Yes, the AD7853BNZ supports system calibration using external gain and offset sources. Its CAL pin triggers calibration sequences, and the REFIN/REFOUT pin accepts external references. The device defines allowable calibration spans: ±0.05 × VREF for offset and ±0.025 × VREF for gain. These values constrain the maximum correctable external error in systems using AD7853BNZ with precision op-amps or sensor conditioners.
What serial interface protocols does the AD7853BNZ support out-of-the-box?
The AD7853BNZ natively supports SPI, QSPI, and 8051-compatible serial interfaces through five selectable modes configured by SM1 and SM2 pins. No firmware or external logic is required to adapt to these protocols. The POLARITY pin selects SCLK idle state (high/low), and SYNC acts as chip select or frame sync depending on mode. AD7853BNZ delivers 16-bit MSB-first data with configurable three-state control.
AD7853BNZ 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:
- -
AD7853BNZ FAQ
1.How can I place an order for AD7853BNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853BNZ 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 AD7853BNZ reliable?
The price and inventory of AD7853BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853BNZ is usually 5 days.
3.What payment methods are accepted for AD7853BNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853BNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853BNZ?
AD7853BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853BNZ 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 AD7853BNZ?
For technical support, including AD7853BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853BNZ requirements.
6.How does Aetrix verify that AD7853BNZ is sourced from the original manufacturer or authorized distributors?
All AD7853BNZ 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 AD7853BNZ meets industry standards.
7.What is the process for return or replacement of AD7853BNZ?
All AD7853BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853BNZ, 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 AD7853BNZ part is unused and in its original packaging.
Return procedure for AD7853BNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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