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Analog Devices Inc. AD7853LBRZ
- Part No.:
- AD7853LBRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7853LBRZ.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,042
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Product details
Overview
AD7853LBRZ from Analog Devices is a 12-bit, 100 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, system/self-calibration, automatic power-down after conversion (1.15 mW at 10 kSPS), and SPI/QSPI/8051-compatible serial interface. Used in battery-powered medical instruments and portable data acquisition systems requiring low-power precision sampling.
For engineers reviewing the AD7853LBRZ datasheet, AD7853LBRZ pinout, AD7853LBRZ application, or AD7853LBRZ equivalent, key selection criteria include its 100 kSPS throughput, ±1 LSB INL (B-grade), 4.5 mW typical active power at 3 V, and 24-lead SOIC package with verified pin mapping for AIN(+), CONVST, BUSY, and SCLK.
Technical Context
The AD7853LBRZ implements a charge-redistribution 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) controlled by AMODE. Calibration logic supports both self-calibration (125013 tCLKIN) and system-level offset/gain adjustment using external reference voltage spans.
Its serial interface supports five programmable modes via SM1/SM2 pins, including external-clock (SCLK input) and self-clocking (SCLK output) configurations, with POLARITY pin selecting SCLK idle state. Power management is controlled via SLEEP pin and control register bits PMGT1/PMGT0, enabling full or partial power-down with retained calibration data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for high-fidelity signal digitization |
| Sampling Rate | 100 kSPS - enables accurate capture of signals up to 50 kHz Nyquist bandwidth |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.025% end-point linearity error over temperature |
| Power (3 V) | 4.5 mW typical - supports >100-hour operation on coin-cell batteries in portable instrumentation |
| Reference | Internal 2.5 V ±2.7 V output - eliminates need for external reference IC; supports 1.2 V–VDD external reference input |
| THD | –78 dB max - maintains signal fidelity for audio and sensor signal chains with low harmonic distortion |
| SNR + Distortion | 71 dB min - provides >70 dB effective number of bits (ENOB ≈ 11.5 bits) at 10 kHz input |
| Track/Hold Acquisition | 500 ns - allows fast settling for multiplexed multi-channel sampling without aperture jitter penalty |
Pinout & Package
AD7853LBRZ is housed in a 24-lead SOIC (R-24) package with 0.3-inch width, JEDEC MS-013 compliant footprint, and 1.27 mm lead pitch. Thermal impedance θJA = 75°C/W enables stable operation at ambient temperatures up to +85°C without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (1) | Convert Start Input | Edge-triggered control initiating T/H hold mode and conversion; must be tied to DVDD if unused |
| BUSY (2) | Conversion Status Output | Active-high open-drain signal indicating conversion/calibration progress; used for handshaking with µP |
| SLEEP (3) | Low-Power Mode Control | Logic 0 powers down all circuitry including internal reference while retaining calibration memory |
| REFIN/REFOUT (4) | Reference I/O | Provides 2.5 V reference output; accepts external 1.2 V–VDD reference input for system-level accuracy tuning |
| AIN(+) (9), AIN(–) (10) | Pseudo-Differential Analog Inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges selected by AMODE; AIN(–) bias required for bipolar mode |
| AMODE (11) | Analog Range Select | Logic 0 configures 0 to VREF input; Logic 1 configures ±VREF/2 input with AIN(–) biased to +VREF/2 |
| CAL (17) | Calibration Trigger | Rising edge initiates self-calibration; 10 nF capacitor to DGND enables auto-cal on power-up |
| DOUT (20), DIN (21) | Serial Data I/O | 16-bit SPI-compatible interface; DIN functions as bidirectional pin depending on SM1/SM2 mode configuration |
| CLKIN (22) | Master Clock Input | 1 MHz (–40°C to +85°C) or 1.8 MHz (0°C to +70°C) clock sets conversion timing and calibration duration |
| SCLK (23), SYNC (24) | Serial Interface Clock/Frame Sync | SCLK direction (input/output) and SYNC function (input chip-select or output frame sync) depend on SM1/SM2 settings |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Calibration on Power-Up | Configurable via CAL pin capacitor; eliminates manual calibration step during system boot and ensures initial accuracy without host intervention |
| Flexible Serial Interface Modes | Five selectable protocols (SPI/QSPI/8051/mP) via SM1/SM2 pins-enables drop-in compatibility across diverse microcontroller platforms |
| Low-Power Operation | 1.15 mW at 10 kSPS in power-down mode; 4.5 mW typical at 100 kSPS-extends battery life in portable medical and field instruments |
| Pseudo-Differential Input Architecture | Rejects common-mode noise on AIN(+) and AIN(–) while supporting both unipolar and bipolar ranges-reduces external signal conditioning complexity |
| On-Chip Reference with Tempco | 2.5 V ±2.7 V output, 20 ppm/°C drift-provides stable scaling without external reference components or layout-sensitive routing |
| System Calibration Support | Offset span ±0.05×VREF and gain span ±0.025×VREF-allows correction of external sensor amplifier errors and PCB trace mismatches |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform acquisition in handheld patient monitors with 3.3 V Li-ion supply. IC Role / Device Role / Timing Role: Primary sampling front-end ADC converting differential electrode signals at 100 kSPS with on-chip reference stability. Use Value: 12-bit resolution and ±1 LSB INL ensure diagnostic-grade waveform fidelity; 4.5 mW power enables >12-hour runtime per charge. | Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in remote field nodes powered by AA batteries. IC Role / Device Role / Timing Role: Low-power analog-to-digital converter interfacing with multiple sensors via multiplexer, triggered by µC on scheduled intervals. Use Value: Auto power-down between conversions reduces average current to µA range; internal calibration maintains accuracy across –40°C to +85°C operating range. |
| Industrial Handheld Testers | Pen-Based Data Capture Systems |
Use Scenario: Multifunction handheld tester measuring voltage, current, and resistance with real-time display and USB upload. IC Role / Device Role / Timing Role: Precision ADC providing calibrated measurements with user-initiated self-calibration before critical tests. Use Value: System calibration capability corrects for thermocouple amplifier offsets and shunt resistor tolerances; SPI interface simplifies integration with ARM Cortex-M host. | Use Scenario: Pen computer digitizing handwritten input via resistive touch overlay with analog stylus pressure sensing. IC Role / Device Role / Timing Role: High-speed sampling ADC capturing pen position and pressure signals synchronously with display refresh. Use Value: 500 ns track/hold acquisition enables clean sampling of fast-moving pen strokes; 24-pin SOIC fits compact PCB layouts with minimal board area. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, SPI interface, no internal reference, 3 V only | Lower resolution limits use to non-critical industrial monitoring-not suitable for medical waveform capture | Select when cost sensitivity outweighs resolution needs and external reference is already present |
| MAX11131ETE+ | 12-bit, 500 kSPS, internal 2.048 V reference, 10-pin µMAX, no system calibration | Higher speed and smaller package-but lacks system calibration and bipolar input support | Select for space-constrained designs needing faster sampling but not requiring field recalibration |
Compared with ADS7822U and MAX11131ETE+, the AD7853LBRZ uniquely combines 12-bit accuracy, system-level calibration, bipolar/unipolar input flexibility, and ultra-low 4.5 mW active power-making it optimal for portable precision measurement where long battery life and field-deployable accuracy are mandatory.
Availability
AD7853LBRZ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, and industrial handheld testers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for AD7853LBRZ 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 AD7853LBRZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in portable and battery-operated instrumentation systems.
FAQ
What is the maximum sampling rate supported by the AD7853LBRZ?
The AD7853LBRZ supports a maximum sampling rate of 100 kSPS, achieved with a 1.8 MHz master clock at 0°C to +70°C or a 1 MHz master clock at –40°C to +85°C. This throughput enables accurate digitization of signals up to 50 kHz bandwidth while maintaining specified SNR and THD performance. The AD7853LBRZ's conversion time is fixed at 18 clock cycles, so actual sample rate depends directly on CLKIN frequency and operating temperature grade.
Does the AD7853LBRZ require an external reference voltage?
No, the AD7853LBRZ does not require an external reference voltage because it integrates a 2.5 V reference with 20 ppm/°C tempco and ±2.7 V output tolerance. However, it supports external reference input via the REFIN/REFOUT pin for improved system-level accuracy-accepting voltages from 1.2 V to AVDD. When using the internal reference, CREF1 (0.1 µF) and CREF2 (0.01 µF) capacitors must be connected to AGND as specified in the AD7853LBRZ datasheet.
How does the AD7853LBRZ handle power management in battery-powered applications?
The AD7853LBRZ offers three power states: normal (4.5 mW at 3 V), sleep (5 µA with external clock off), and full power-down (1 µA typical). The SLEEP pin controls entry into low-power mode, and the control register allows software-configurable power management (PMGT1/PMGT0 bits). After each conversion, the device automatically enters power-down unless disabled-reducing average power in intermittent-sampling applications like environmental data loggers where the AD7853LBRZ operates at <10 kSPS.
Can the AD7853LBRZ perform system-level calibration with external components?
Yes, the AD7853LBRZ supports system-level calibration using external signal chain components. Its calibration engine accepts system offset spans of ±0.05 × VREF and system gain spans of ±0.025 × VREF, allowing correction of errors introduced by external amplifiers, sensors, or PCB traces. This is performed by applying known reference signals to AIN(+) and AIN(–) while asserting CAL, and requires no host µC involvement beyond initiating the sequence-making it ideal for field-deployable calibration in portable medical or test equipment using the AD7853LBRZ.
What serial interface protocols are compatible with the AD7853LBRZ?
The AD7853LBRZ supports five serial interface modes selectable via SM1 and SM2 pins, making it compatible with SPI, QSPI, 8051, and generic µP protocols. It operates with either external SCLK (modes 1–3) or self-clocking SCLK output (modes 4–5), and the POLARITY pin determines whether SCLK idles high or low. All modes use 16-bit framing with configurable read/write addressing, enabling seamless integration with diverse host controllers without protocol translation hardware.
AD7853LBRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- 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:
- -
AD7853LBRZ FAQ
1.How can I place an order for AD7853LBRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853LBRZ 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 AD7853LBRZ reliable?
The price and inventory of AD7853LBRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853LBRZ is usually 5 days.
3.What payment methods are accepted for AD7853LBRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853LBRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853LBRZ?
AD7853LBRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853LBRZ 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 AD7853LBRZ?
For technical support, including AD7853LBRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853LBRZ requirements.
6.How does Aetrix verify that AD7853LBRZ is sourced from the original manufacturer or authorized distributors?
All AD7853LBRZ 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 AD7853LBRZ meets industry standards.
7.What is the process for return or replacement of AD7853LBRZ?
All AD7853LBRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853LBRZ, 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 AD7853LBRZ part is unused and in its original packaging.
Return procedure for AD7853LBRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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