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Analog Devices Inc. AD7895BRZ-10
- Part No.:
- AD7895BRZ-10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7895BRZ-10.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
AD7895BRZ-10 from Analog Devices is a 12-bit successive-approximation ADC with ±10 V analog input range, 3.8 µs conversion time in Mode 1, single +5 V supply operation, and high-speed 2-wire serial interface (SCLK/SDATA). It integrates on-chip track/hold amplifier, internal clock, and 2's complement output coding - used in precision data acquisition systems for industrial sensor interfacing and automated test equipment.
For engineers reviewing the AD7895BRZ-10 datasheet, AD7895BRZ-10 pinout, AD7895BRZ-10 application, or AD7895BRZ-10 equivalent, key selection considerations include bipolar ±10 V input scaling, guaranteed no missing codes, 70 dB SNR at 50 kHz, automatic power-down mode (5 µA standby), and SOIC-8 package compatibility with legacy 8-pin ADC layouts.
Technical Context
The AD7895BRZ-10 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with signal scaling circuitry enabling ±10 V full-scale input while operating from a single +5 V rail. Its buffered reference input accepts 2.375 V to 2.625 V, and the on-chip track/hold achieves 0.5 µs acquisition time to ±1/2 LSB.
It supports two deterministic operating modes: Mode 1 (high-speed, 3.8 µs conversion, BUSY asserted on CONVST falling edge) and Mode 2 (auto-sleep, 9.8 µs total cycle including 6 µs wake-up, 5 µA IDD standby). Serial data output delivers 16-bit frames: four leading zeros followed by 12-bit 2's complement result, synchronized to SCLK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full temperature range (–40°C to +85°C). |
| Conversion Time | 3.8 µs (Mode 1) - enables up to 192 kSPS throughput when paired with 15 MHz SCLK and proper timing margins. |
| Analog Input Range | ±10 V - supports direct connection to industrial ±10 V sensor outputs without external level-shifting. |
| Signal-to-(Noise+Distortion) | 70 dB min @ 50 kHz - meets requirements for medium-fidelity instrumentation and control loop feedback. |
| Power Dissipation | 20 mW max (active), 25 µW max (power-down) - suitable for battery-backed or thermally constrained embedded systems. |
| Reference Input | 2.375 V to 2.625 V (2.5 V ±5%) - requires external precision reference (e.g., AD780); gain error scales linearly with REF IN deviation. |
| Digital Interface | 2-wire serial (SCLK/SDATA) - eliminates parallel bus routing; data valid on SCLK falling edge with 10 ns hold time. |
Pinout & Package
AD7895BRZ-10 is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered, high-impedance node accepting 2.375–2.625 V; sets full-scale range and directly impacts gain accuracy. |
| 2 - VIN | Analog input channel | Accepts ±10 V differential-to-ground signal; input resistance ≥24 kΩ; no dynamic charging current due to internal resistor network and T/H front-end. |
| 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 | Asynchronous edge-triggered clock (max 15 MHz); falling edge clocks out SDATA bit; timing-critical for data capture. |
| 5 - SDATA | Serial data output | Three-state CMOS output delivering 16-bit frame (4 zeros + 12-bit 2's complement); data valid 10 ns after SCLK falling edge. |
| 6 - BUSY | Conversion status indicator | Open-drain or CMOS output; goes high on CONVST falling edge, returns low 3.8 µs later - used for hardware handshaking or interrupt generation. |
| 7 - CONVST | Convert start trigger | Edge-sensitive input; falling edge initiates conversion and T/H hold; low state at end of conversion enables auto-sleep mode. |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers all analog and digital sections; decoupling capacitor (0.1 µF ceramic) required within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 12-bit SAR architecture | Eliminates need for ±15 V rails in industrial signal chains, reducing BOM count and layout complexity. |
| On-chip track/hold amplifier | Acquires ±10 V signals to 12-bit accuracy in ≤0.5 µs - enables accurate sampling of 100 kHz+ bandwidth inputs without external components. |
| Two-wire serial interface | Reduces PCB trace count vs. parallel ADCs; compatible with SPI-compatible controllers using SCLK/SDATA only (no CS required). |
| Auto power-down mode | Reduces average current to 5 µA between conversions - extends battery life in portable DAQ or remote sensor nodes. |
| Bipolar ±10 V input scaling | Direct interface to standard industrial voltage sensors (e.g., strain gauge bridges with ±10 V excitation) without external op-amp gain stages. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transmitters outputting ±10 V analog signals in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing sensor outputs at 10–100 kSPS; BUSY signal synchronizes microcontroller read cycles. Use Value: Guaranteed no missing codes and 70 dB SNR ensure accurate representation of slow-varying process variables without interpolation artifacts. |
Use Scenario: Digitizing stimulus-response waveforms during functional testing of analog circuits on production test fixtures. IC Role / Device Role / Timing Role: High-throughput ADC capturing transient responses; SCLK-driven serial output minimizes controller GPIO usage. Use Value: 3.8 µs conversion time enables sub-5 µs per-sample acquisition windows, supporting fast test cycle times without FIFO buffering. |
| Portable Data Loggers | Motor Control Feedback Systems |
|
Use Scenario: Battery-powered environmental loggers acquiring thermocouple or RTD signals via signal-conditioning amplifiers. IC Role / Device Role / Timing Role: Low-power ADC operating in Mode 2; CONVST pulse triggers wake-up and conversion, then returns to 5 µA sleep. Use Value: 25 µW power-down dissipation extends multi-year battery life while maintaining precise ±10 V measurement capability. |
Use Scenario: Sampling current-sense amplifier outputs in servo drives to compute real-time torque and position correction. IC Role / Device Role / Timing Role: Precision ADC feeding FPGA or DSP with synchronized BUSY handshake for deterministic control loop timing. Use Value: ±1 LSB relative accuracy and 0.5 µs track/hold acquisition ensure minimal phase lag in closed-loop current regulation. |
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 |
|---|---|---|---|
| AD7894ARZ | 14-bit resolution, same SOIC-8 pinout, 3.8 µs conversion, but requires external reference and has no on-chip track/hold. | Higher resolution needed for metrology-grade systems; lacks integrated T/H, requiring external circuitry for wideband signals. | Select AD7894ARZ only when 14-bit precision is mandatory and external T/H + reference design is acceptable. |
| ADS7822U | 12-bit, 2.7–5.25 V supply, SPI-compatible 3-wire interface (CS required), 7.5 µs conversion, no auto-sleep mode. | Lower supply voltage flexibility; higher power (1.25 mW active); suited for low-voltage mixed-signal SoC interfaces. | Choose ADS7822U for 3.3 V systems where SPI protocol compliance and smaller footprint outweigh power and speed trade-offs. |
Compared with AD7895BRZ-10, AD7894ARZ offers higher resolution but adds design complexity and cost, while ADS7822U reduces supply flexibility and increases active power - making AD7895BRZ-10 optimal for ±10 V, 5 V, low-power industrial DAQ where integration and proven reliability are prioritized.
Availability
AD7895BRZ-10 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable data loggers, and motor control feedback systems requiring stable component supply across extended product lifecycles.
Supply support for AD7895BRZ-10 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7895BRZ-10 belongs to Analog Devices' precision data acquisition ADC family, designed specifically for industrial and instrumentation applications demanding robust ±10 V input handling, low power, and compact 8-pin integration.
FAQ
What is the maximum recommended SCLK frequency for reliable operation of the AD7895BRZ-10?
The AD7895BRZ-10 supports up to 15 MHz SCLK, but system-level timing must respect t4 (603 ns max data access time) and t5 (10 ns min data hold time). At 15 MHz, the 66.7 ns clock period leaves marginal margin; for robust designs, 10 MHz is recommended to accommodate PCB trace delays and controller setup/hold uncertainties. The AD7895BRZ-10 datasheet specifies this limit under "Timing Characteristics" with test conditions at VDD = 5 V ±5%.
Does the AD7895BRZ-10 require an external reference, and what are the critical specifications for that reference?
Yes, the AD7895BRZ-10 requires an external 2.5 V reference applied to the REF IN pin, with tolerance 2.375 V to 2.625 V (±5%). Critical specs include low drift (<10 ppm/°C), low noise (<10 µV p-p), and output current capability ≥1 µA. Recommended references include the AD780 (2.5 V, 0.1 ppm/°C drift) or ADR421 (2.5 V, 3 ppm/°C), both of which maintain AD7895BRZ-10's specified ±1 LSB linearity and 70 dB SNR performance.
How does the auto power-down mode function in the AD7895BRZ-10, and how is it enabled?
The AD7895BRZ-10 enters auto power-down mode when CONVST remains low after BUSY goes low (end of conversion). In this state, IDD drops to 5 µA max. To initiate the next conversion, a rising edge on CONVST wakes the device (6 µs wake-up time), followed by falling edge to start conversion. This behavior is exclusive to Mode 2 operation and is confirmed in the "Operating Modes" section of the AD7895BRZ-10 datasheet, Figure 4 timing diagram.
Is the AD7895BRZ-10 pin-compatible with other variants in the AD7895 family, such as the AD7895BRZ-3 or AD7895BRZ-2?
Yes, all AD7895 variants - including AD7895BRZ-10, AD7895BRZ-3, and AD7895BRZ-2 - share identical SOIC-8 pinout and electrical interface (SCLK, SDATA, BUSY, CONVST, etc.). However, input ranges differ: AD7895BRZ-10 uses ±10 V, AD7895BRZ-3 uses ±2.5 V, and AD7895BRZ-2 uses 0–2.5 V unipolar. Output coding also differs: AD7895BRZ-10 and -3 use 2's complement; AD7895BRZ-2 uses straight binary. These differences require firmware adaptation but no PCB change.
What is the significance of the "no missing codes" guarantee for the AD7895BRZ-10, and under what conditions does it apply?
The AD7895BRZ-10 guarantees no missing codes over its full 12-bit range (0 to 4095) across the entire specified temperature range (–40°C to +85°C) and supply voltage (5 V ±5%). This means every possible digital output code appears for some analog input value, ensuring monotonicity and eliminating data gaps in control or measurement applications. The guarantee is validated per the "DC Accuracy" section of the AD7895BRZ-10 datasheet, with ±1 LSB relative accuracy specification.
AD7895BRZ-10 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-10 FAQ
1.How can I place an order for AD7895BRZ-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7895BRZ-10 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-10 reliable?
The price and inventory of AD7895BRZ-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7895BRZ-10 is usually 5 days.
3.What payment methods are accepted for AD7895BRZ-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7895BRZ-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7895BRZ-10?
AD7895BRZ-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7895BRZ-10 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-10?
For technical support, including AD7895BRZ-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7895BRZ-10 requirements.
6.How does Aetrix verify that AD7895BRZ-10 is sourced from the original manufacturer or authorized distributors?
All AD7895BRZ-10 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-10 meets industry standards.
7.What is the process for return or replacement of AD7895BRZ-10?
All AD7895BRZ-10 units undergo pre-shipment inspection (PSI). If there is an issue with AD7895BRZ-10, 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-10 part is unused and in its original packaging.
Return procedure for AD7895BRZ-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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