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Analog Devices Inc. AD7895BRZ-2
- Part No.:
- AD7895BRZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7895BRZ-2.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,420
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Product details
Overview
AD7895BRZ-2 from Analog Devices is a 12-bit successive-approximation ADC with 3.8 µs conversion time, single +5 V supply operation, on-chip track/hold amplifier, and high-speed serial interface. It accepts 0 V to +2.5 V unipolar input range, delivers straight binary output coding, and consumes ≤20 mW - used in precision data acquisition systems for industrial sensors and portable instrumentation.
For engineers reviewing the AD7895BRZ-2 datasheet, AD7895BRZ-2 pinout, AD7895BRZ-2 application, or AD7895BRZ-2 equivalent, key selection considerations include its 0–2.5 V input range, SOIC-8 package, 12-bit resolution with ±1 LSB relative accuracy, 70 dB SNR at 50 kHz, and automatic power-down mode enabling low-power embedded sampling.
Technical Context
The AD7895BRZ-2 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with integrated track/hold acquiring to ±0.5 LSB in ≤0.5 µs. Its analog front-end directly accepts 0 V to +2.5 V inputs with <500 nA input current and no external scaling resistors.
It operates in two modes: Mode 1 (high-speed, 3.8 µs conversion) and Mode 2 (auto-sleep, 9.8 µs total wake-up + conversion), both using a 2-wire serial interface (SCLK/SDATA) with 16-bit frame format (4 leading zeros + 12 data bits) and BUSY status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 discrete levels for high-fidelity sensor digitization. |
| Analog Input Range | 0 V to +2.5 V - optimized for unipolar signals like RTD outputs or DAC feedback loops without level-shifting. |
| Conversion Time | 3.8 µs (Mode 1) - enables up to 192 kSPS throughput when paired with 15 MHz SCLK and proper timing margins. |
| Signal-to-Noise+Distortion | 70 dB min @ 50 kHz - meets precision measurement requirements for 10+ ENOB in industrial monitoring. |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and predictable transfer function across full temperature range (–40°C to +85°C). |
| Power Dissipation | 20 mW max - supports battery-powered handheld meters and low-power IoT edge nodes. |
| Reference Input | +2.5 V ±5% - requires external precision reference (e.g., AD780); gain error scales linearly with REF IN deviation. |
| Output Coding | Straight binary - simplifies firmware parsing vs. 2's complement; MSB-first, 16-clock read cycle. |
Pinout & Package
AD7895BRZ-2 is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered +2.5 V reference node; max 1 µA input current; determines full-scale gain and must be stable to ±0.1% for <1 LSB error. |
| 2 - VIN | Analog input channel | Direct connection to track/hold input; 0 V to +2.5 V unipolar range; <500 nA input bias current enables high-impedance sensor interfacing. |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic; must be star-connected to minimize noise coupling. |
| 4 - SCLK | Serial clock input | External clock up to 15 MHz; falling edge clocks out SDATA; timing-critical for meeting t4 (603 ns max access time) and t5 (10 ns min hold). |
| 5 - SDATA | Serial data output | 16-bit frame (4 zeros + 12 data bits); 2-wire interface; tri-stated after 16th SCLK falling edge; straight binary coding. |
| 6 - BUSY | Conversion status indicator | Active-high open-drain signal; asserts on CONVST falling edge, deasserts 3.8 µs later; used for polling or interrupt-driven reads. |
| 7 - CONVST | Convert start trigger | Edge-sensitive input; falling edge initiates conversion and hold mode; low state at completion enables auto-sleep mode. |
| 8 - VDD | Positive supply | +5 V ±5%; powers all analog and digital sections; decoupling capacitor required near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤0.5 µs - eliminates need for external THA and reduces board space in compact DAQ designs. |
| Auto power-down mode | Reduces IDD to ≤10 µA between conversions - extends battery life in intermittent-sampling applications like environmental loggers. |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 15 MHz max clock - simplifies microcontroller GPIO usage and avoids parallel bus routing complexity. |
| Single +5 V supply operation | No dual supplies or charge pumps required - lowers system BOM cost and simplifies power architecture for embedded controllers. |
| SOIC-8 package | Standard 8-pin surface-mount footprint - enables drop-in replacement in legacy designs and compatibility with automated assembly lines. |
| Unipolar 0–2.5 V input range | Matches common voltage-output sensors and DACs - removes need for external op-amp level-shifting or attenuation networks. |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Digitizing 4–20 mA loop-powered transducer outputs via precision shunt resistor. IC Role / Device Role / Timing Role: ADC front-end converting conditioned 0–2.5 V shunt voltage with 12-bit resolution and minimal latency. Use Value: Enables direct interface to current-loop sensors without external amplification or level-shifting, reducing component count and calibration drift. | Use Scenario: Battery-operated environmental monitor capturing temperature, humidity, and pressure at 100 Hz intervals. IC Role / Device Role / Timing Role: Low-power sampling engine using auto-sleep mode to minimize average current draw during idle periods. Use Value: Achieves >1-year battery life by drawing only 10 µA between conversions while maintaining 12-bit fidelity per sample. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Signal conditioning stage in handheld ECG or pulse oximeter front-end. IC Role / Device Role / Timing Role: High-accuracy digitizer for amplified biopotential signals within 0–2.5 V range, synchronized to MCU timer. Use Value: Delivers 70 dB SNR at 50 kHz - sufficient for clinical-grade waveform capture without oversampling or post-processing filtering. | Use Scenario: Embedded digitizer in benchtop multimeter or calibrator requiring traceable DC voltage measurement. IC Role / Device Role / Timing Role: Precision unipolar ADC referenced to AD780 +2.5 V source, supporting 0.01% full-scale accuracy. Use Value: Meets metrology-grade linearity (±1 LSB) and stability over temperature, eliminating need for per-unit gain trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7895ARZ-2 | Same specs and SOIC-8 package; A-grade (-40°C to +85°C) vs. B-grade (same temp range but tighter initial linearity binning not specified) | Identical functional use; ARZ-2 may have marginally better production yield consistency for high-volume OEMs | Select AD7895ARZ-2 if long-term parametric stability across batches is prioritized over cost. |
| ADS7822U | 12-bit SAR ADC, 2.7–5.25 V supply, SPI-compatible 4-wire interface, 2.5 µs conversion, 0–VREF input range | Requires separate VREF; uses 4-wire SPI (CS, SCLK, DIN, DOUT) instead of 2-wire serial + BUSY | Choose ADS7822U when existing firmware uses standard SPI peripherals and higher speed (2.5 µs) is critical. |
Compared with AD7895ARZ-2, AD7895BRZ-2 offers identical performance in SOIC-8 but targets cost-sensitive industrial designs; versus ADS7822U, it trades SPI compatibility for simpler 2-wire control and integrated BUSY signaling - reducing MCU GPIO count and interrupt latency.
Availability
AD7895BRZ-2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical instrumentation, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for AD7895BRZ-2 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 AD7895BRZ-2 belongs to Analog Devices' precision data acquisition IC family, designed specifically for space-constrained, low-power, high-accuracy sampling applications where integration of track/hold, reference buffering, and serial interface in an 8-pin package is essential.
FAQ
What is the maximum sampling rate achievable with the AD7895BRZ-2?
The AD7895BRZ-2 achieves up to 192 kSPS in Mode 1 (high-speed) operation. This requires a 15 MHz SCLK, 3.8 µs conversion time, 1.1 µs serial read (16 clocks), 0.5 µs track/hold acquisition, and ≥300 ns inter-conversion guard band. Real-world throughput depends on MCU interface timing margins and SCLK stability.
Does the AD7895BRZ-2 require an external reference voltage?
Yes, the AD7895BRZ-2 requires an external +2.5 V reference applied to the REF IN pin. The part buffers this input internally; reference accuracy directly impacts full-scale gain error. Recommended sources include the AD780 or AD680 precision references, stable to ±0.05% over temperature.
How does the auto power-down mode work in the AD7895BRZ-2?
In auto power-down mode (Mode 2), the AD7895BRZ-2 enters sleep state when CONVST remains low after conversion completes (BUSY goes low). It "wakes up" on the rising edge of the next CONVST pulse, with 6 µs wake-up time before hold mode activation. This reduces average current to ≤10 µA, ideal for intermittent sampling.
What is the purpose of the BUSY pin on the AD7895BRZ-2?
On the AD7895BRZ-2, the BUSY pin is an active-high, open-drain status signal indicating conversion progress. It asserts on the falling edge of CONVST and deasserts 3.8 µs later (Mode 1), enabling polling or interrupt-driven data reads without fixed delays or SCLK dependency.
Can the AD7895BRZ-2 interface directly with a microcontroller SPI peripheral?
The AD7895BRZ-2 uses a custom 2-wire serial protocol (SCLK/SDATA) with BUSY signaling - not standard SPI. While some MCUs can bit-bang this interface, true SPI peripherals require CS and MOSI lines not present on AD7895BRZ-2. For SPI-native designs, consider alternatives like the ADS7822U.
AD7895BRZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 192k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7895BRZ-2 FAQ
1.How can I place an order for AD7895BRZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7895BRZ-2 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 AD7895BRZ-2 reliable?
The price and inventory of AD7895BRZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7895BRZ-2 is usually 5 days.
3.What payment methods are accepted for AD7895BRZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7895BRZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7895BRZ-2?
AD7895BRZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7895BRZ-2 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 AD7895BRZ-2?
For technical support, including AD7895BRZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7895BRZ-2 requirements.
6.How does Aetrix verify that AD7895BRZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7895BRZ-2 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 AD7895BRZ-2 meets industry standards.
7.What is the process for return or replacement of AD7895BRZ-2?
All AD7895BRZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7895BRZ-2, 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 AD7895BRZ-2 part is unused and in its original packaging.
Return procedure for AD7895BRZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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