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Analog Devices Inc. AD7853BRZ
- Part No.:
- AD7853BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7853BRZ.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
AD7853BRZ 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, track-and-hold, self/system calibration logic, and SPI/QSPI/8051-compatible serial interface. Designed for portable instrumentation and battery-powered data acquisition, it delivers ±1 LSB integral nonlinearity, 71 dB SNR at 10 kHz input, and 4.6 µs conversion time.
For engineers reviewing the AD7853BRZ datasheet, AD7853BRZ pinout, AD7853BRZ application, or AD7853BRZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated 24-pin SOIC package mapping, confirmed functional alternatives, and supply-chain support for industrial embedded and medical device development.
Technical Context
The AD7853BRZ implements a SAR architecture with integrated charge redistribution DAC and buffered track-and-hold, enabling 500 ns acquisition time and full-scale conversion of signals up to AVDD. Its dual-domain power system separates analog (AVDD/AGND) and digital (DVDD/DGND) supplies to minimize noise coupling.
Calibration is managed via dedicated CAL pin and internal control register, supporting automatic power-up self-calibration, system offset/gain calibration, and programmable power-down modes (full/partial). Serial communication uses configurable SM1/SM2 pins to select among five interface modes - including external-clock and self-clocking - with POLARITY pin controlling SCLK idle state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precision sensor digitization |
| Throughput Rate | 200 kSPS - supports real-time sampling of audio-band and control-loop signals without decimation |
| INL / DNL | ±1 LSB max / ±1 LSB max - guarantees monotonicity and no missing codes across temperature |
| SNR + THD | 71 dB min at 10 kHz - enables >11.5 ENOB for high-fidelity signal capture in noisy environments |
| Supply Range | 3.0 V to 5.5 V - interoperable with both Li-ion (3.3 V) and legacy 5 V logic systems |
| Power Dissipation | 20 mW max at 5.5 V - allows continuous operation in thermally constrained handheld devices |
| Reference | Internal 2.5 V ±20 ppm/°C - eliminates external reference component while maintaining stability over industrial temp range |
Pinout & Package
AD7853BRZ is housed in a 24-lead SOIC (R-24) package with standard 0.3-inch body width and 1.27 mm pitch. Pin 1 is marked by a beveled corner; pin numbering follows counter-clockwise convention from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (1) | Convert Start trigger | Rising-edge initiates T/H hold and conversion; unused must tie to DVDD to prevent floating |
| BUSY (2) | Conversion status indicator | Active-high open-drain output signals active conversion or calibration; used for handshaking with µP |
| SLEEP (3) | Low-power mode control | Logic 0 powers down all circuitry including internal reference; retains calibration data in memory |
| REFIN/REFOUT (4) | Reference voltage node | Provides 2.5 V internal reference; accepts external 1.2–VDD reference or connects to AVDD for rail-to-rail input scaling |
| AIN(+) (9), AIN(–) (10) | Pseudo-differential analog inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) biasing required for bipolar mode |
| AMODE (11) | Analog range selector | Logic 0 = unipolar (0 to VREF); Logic 1 = bipolar (±VREF/2); determines input voltage constraints |
| CAL (17) | Calibration initiator | Rising edge triggers self-calibration; 10 nF cap to DGND enables auto-cal on power-up |
| DOUT (20), DIN (21) | Serial data I/O | 16-bit MSB-first interface; DIN functions as input or bidirectional depending on SM1/SM2 configuration |
| SCLK (23), SYNC (24) | Serial clock & frame sync | SCLK direction (input/output) and SYNC role (input chip-select or output frame-sync) depend on SM1/SM2 mode selection |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration on power-up | Eliminates manual calibration step during system startup; ensures accuracy within ±1 LSB before first conversion |
| Flexible serial interface modes | Five selectable protocols (SPI/QSPI/8051/mP) via SM1/SM2 pins - avoids protocol-specific controller hardware |
| Pseudo-differential input architecture | Rejects common-mode noise on AIN(+)/AIN(–) pair while supporting single-ended signal routing with proper biasing |
| Multi-level power management | Three sleep states (full/partial/external-clock-off) reduce current to 5 µA max - extends battery life in intermittent-sampling applications |
| On-chip 2.5 V reference with low tempco | 20 ppm/°C drift enables stable 12-bit performance across –40°C to +85°C without external trimming |
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; synchronized to µP via BUSY handshake and SCLK-driven serial readout. Use Value: 200 kSPS throughput captures 50 Hz harmonics with margin; ±1 LSB INL ensures diagnostic-grade amplitude fidelity; 20 mW dissipation prevents thermal drift in sealed enclosure. |
Use Scenario: Environmental sensor node logging temperature, humidity, and pressure over multi-day cycles using intermittent wake-up. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated by µP; enters full power-down between samples using SLEEP pin control. Use Value: 5 µA sleep current minimizes quiescent drain; internal reference removes need for external precision voltage source; SOIC package enables compact PCB layout. |
| Industrial Control Loop Sampling | High-Speed Modem Analog Front-End |
Use Scenario: Real-time feedback sampling in motor drive current sensing with 100 kHz closed-loop bandwidth requirement. IC Role / Device Role / Timing Role: High-speed analog input stage feeding DSP; uses AMODE=1 for bipolar current measurement around ground-referenced shunt. Use Value: 4.6 µs conversion time meets loop timing budget; pseudo-differential input rejects PWM noise coupling into shunt path; 71 dB SNR preserves signal integrity. |
Use Scenario: Digitizing baseband I/Q signals in 56 kbps modem designs requiring clean 10 kHz–40 kHz bandpass capture. IC Role / Device Role / Timing Role: Dual-channel sampling (using two AD7853BRZ) for simultaneous I and Q path digitization with synchronous CONVST triggering. Use Value: 71 dB SNR + –78 dB THD meets ITU-T V.34 linearity requirements; flexible serial interface simplifies FPGA interface logic; SOIC package supports automated assembly. |
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 |
|---|---|---|---|
| AD7853LBRZ | 100 kSPS max, 6.85 mW at 3.6 V, 1 MHz CLKIN - lower speed and power than AD7853BRZ | Preferred for ultra-low-power, sub-100 kHz sampling where 100 kSPS suffices | Select AD7853LBRZ only if system throughput <100 kSPS and sleep current <5 µA is critical |
| ADS7822U | 200 kSPS, 12-bit, SPI-only interface, no internal reference, 3.3 V only - requires external REF and level-shifting for 5 V systems | Suitable for cost-sensitive 3.3 V designs where board space allows external reference and decoupling caps | Choose ADS7822U when minimizing BOM count is secondary to lowest unit cost in 3.3 V-only systems |
Compared with AD7853LBRZ, AD7853BRZ delivers double throughput and higher dynamic range for demanding signal chains; versus ADS7822U, it offers integrated reference and wider supply range but at higher unit cost and larger footprint.
Availability
AD7853BRZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial control loop sampling requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7853BRZ 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 AD7853BRZ belongs to Analog Devices' precision SAR ADC product line, engineered for portable and low-power applications demanding high DC accuracy, low noise, and flexible digital interfacing without external reference components.
FAQ
What is the maximum sampling rate supported by the AD7853BRZ?
The AD7853BRZ supports a maximum throughput rate of 200 kSPS under specified conditions: AVDD = DVDD = 4.5 V to 5.5 V, fCLKIN = 4 MHz, and TA = –40°C to +85°C. This is achieved with 4.6 µs conversion time and requires ≥400 ns acquisition time between BUSY falling edge and next CONVST rising edge. The AD7853BRZ datasheet confirms this value applies to the B-grade version in SOIC packaging.
Does the AD7853BRZ require an external reference voltage?
No, the AD7853BRZ includes an internal 2.5 V reference with ±20 ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. However, the REFIN/REFOUT pin supports overdriving with external references from 1.2 V to AVDD, enabling custom full-scale ranges. When using the internal reference, CREF1 (0.1 µF) and CREF2 (0.01 µF) capacitors must be connected to AGND per the AD7853BRZ pinout and layout guidelines.
How does the AD7853BRZ handle power management during idle periods?
The AD7853BRZ implements three distinct power-down states controlled via the SLEEP pin and internal power management bits. In full power-down (PMGT1=1, PMGT0=0), current drops to 5 µA max with external clock off; partial power-down draws 200 µA typ. Calibration data is retained in all modes. Power-up recovery is immediate - no reinitialization delay - making it ideal for burst-mode sampling in battery-powered AD7853BRZ applications.
Can the AD7853BRZ interface directly with an 8051 microcontroller?
Yes, the AD7853BRZ supports native 8051-compatible serial interface mode (Interface Mode 2 per datasheet Table X), requiring only SCLK, DIN, DOUT, and SYNC connections. No level-shifting is needed for 5 V 8051 systems, as AD7853BRZ logic inputs accept 2.4 V min high-level at DVDD = 5 V. The BUSY pin provides ready signaling, and CONVST can be driven directly from an 8051 I/O pin to initiate conversions synchronously.
What analog input configurations does the AD7853BRZ support?
The AD7853BRZ supports two analog input ranges selected by the AMODE pin: unipolar (0 to VREF) when AMODE = 0, and bipolar (±VREF/2) when AMODE = 1. In unipolar mode, AIN(+) must stay ≥ AIN(–); in bipolar mode, AIN(–) must be biased to +VREF/2, and AIN(+) must remain ≥ 0 V. Both modes use pseudo-differential topology, rejecting common-mode noise while allowing single-ended signal routing with appropriate front-end design for the AD7853BRZ.
AD7853BRZ 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):
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7853BRZ FAQ
1.How can I place an order for AD7853BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853BRZ 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 AD7853BRZ reliable?
The price and inventory of AD7853BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853BRZ is usually 5 days.
3.What payment methods are accepted for AD7853BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853BRZ?
AD7853BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853BRZ 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 AD7853BRZ?
For technical support, including AD7853BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853BRZ requirements.
6.How does Aetrix verify that AD7853BRZ is sourced from the original manufacturer or authorized distributors?
All AD7853BRZ 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 AD7853BRZ meets industry standards.
7.What is the process for return or replacement of AD7853BRZ?
All AD7853BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7853BRZ, 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 AD7853BRZ part is unused and in its original packaging.
Return procedure for AD7853BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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