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Analog Devices Inc. AD7894BRZ-10
- Part No.:
- AD7894BRZ-10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7894BRZ-10.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:231
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Product details
Overview
AD7894BRZ-10 from Analog Devices is a 14-bit successive-approximation ADC with ±10 V bipolar input range, 5 µs conversion time in high-speed mode, 77 dB SNR at 70 kHz, and on-chip track/hold amplifier - designed for precision data acquisition in industrial instrumentation and motor control feedback loops.
For engineers reviewing the AD7894BRZ-10 datasheet, AD7894BRZ-10 pinout, AD7894BRZ-10 application, or AD7894BRZ-10 equivalent, key selection criteria include guaranteed ±1.5 LSB relative accuracy over –40°C to +85°C, SO-8 package compatibility, single 5 V supply operation, and twos-complement serial output timing aligned to SCLK falling edge.
Technical Context
The AD7894BRZ-10 implements a laser-trimmed internal clock driving a 14-bit R-2R ladder SAR core, with integrated signal scaling resistors (R1=8 kΩ, R2=R3=2 kΩ) enabling ±10 V full-scale input from a +2.5 V reference. Its track/hold achieves 14-bit settling in ≤0.35 µs with 7.5 MHz small-signal bandwidth and 50 ps aperture jitter.
It operates in two modes: Mode 1 (5 µs conversion, continuous sampling up to 160 kHz) and Mode 2 (10 µs effective conversion including 5 µs wake-up, auto-power-down to 20 µA). Serial interface uses SCLK falling edge to clock out 16-bit frames: two leading zeros followed by 14-bit twos-complement data, with SDATA three-stated after the 16th edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14 bits - guarantees no missing codes across full operating temperature range |
| Conversion Time | 5 µs max (Mode 1) - enables 160 kHz sustained throughput with 250 ns quiet time before next CONVST |
| Input Range | ±10 V - supported by on-chip resistor network; requires external +2.5 V reference at REF IN |
| Relative Accuracy | ±1.5 LSB max - specifies endpoint nonlinearity error over –40°C to +85°C (B-grade) |
| SNR | 77 dB min at 70 kHz - measured with fSAMPLE = 160 kHz, defines usable dynamic range for AC signals |
| Power Dissipation | 20 mW typ at 5 V - drops to 15 µW in power-down mode, critical for portable or low-quiescent systems |
| Package | SO-8 (Narrow Body) - 150 mil width, standard JEDEC MS-012 footprint, compatible with automated assembly |
Pinout & Package
AD7894BRZ-10 is housed in an 8-lead narrow-body SOIC (SO-8) package with standard JEDEC MS-012 dimensions (4.9 mm × 3.9 mm × 1.75 mm), gull-wing leads, and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; 1 µA max input current; sets full-scale gain for ±10 V range |
| 2 - VIN | Analog input channel | ±10 V differential input (relative to GND); high-impedance node after scaling resistors; no dynamic charging current |
| 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 input controlling SDATA timing; data valid 10 ns after falling edge; supports up to 16 MHz frequency |
| 5 - SDATA | Serial data output | Three-state output delivering 16-bit frame (2 zeros + 14-bit twos-complement); disabled after 16th SCLK edge |
| 6 - BUSY | Conversion status indicator | Active-high open-drain signal; goes high on CONVST falling edge, returns low 5 µs later when conversion completes |
| 7 - CONVST | Edge-triggered conversion start | Falling-edge sensitive; initiates track-to-hold transition and conversion sequence; low hold enables auto-power-down |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; 5.5 mA max IDD; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 14-bit conversion | Operates from +5 V only - eliminates need for dual ±15 V supplies in legacy industrial designs |
| On-chip track/hold amplifier | Acquires ±10 V signals to 14-bit accuracy in ≤0.35 µs - removes requirement for external THS circuitry |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 16 MHz max clock - reduces PCB routing complexity vs parallel bus ADCs |
| Auto-power-down mode | Draws 20 µA in sleep - extends battery life in portable DAQ systems without software intervention |
| B-grade accuracy guarantee | ±1.5 LSB relative accuracy over –40°C to +85°C - enables drop-in replacement of AD7894AR-10 in demanding environments |
Applications
| Industrial Process Monitoring | Motor Phase Current Sensing |
|---|---|
Use Scenario: Continuous voltage measurement of 4–20 mA loop transmitters and thermocouple amplifiers in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; synchronized to system controller via CONVST pulses. Use Value: ±1.5 LSB linearity ensures <0.025% full-scale error across temperature - meets SIL-2 functional safety margin requirements. |
Use Scenario: Real-time sampling of shunt-based current waveforms in 3-phase inverter drives. IC Role / Device Role / Timing Role: High-speed acquisition node capturing phase currents at 160 kHz; BUSY signal used for DMA trigger synchronization. Use Value: 5 µs conversion + 0.35 µs track/hold acquisition enables accurate reconstruction of 10 kHz fundamental harmonics. |
| Portable Power Quality Analyzer | Test & Measurement Front-End |
Use Scenario: Battery-powered handheld device measuring harmonic distortion and RMS voltage in AC mains. IC Role / Device Role / Timing Role: Core ADC in isolated signal chain; auto-power-down mode activated between 10 ms sample intervals. Use Value: 20 µA sleep current extends 4× AA battery life to >12 hours - enabled by hardware-controlled power state transitions. |
Use Scenario: Modular digitizer card in benchtop oscilloscopes and spectrum analyzers requiring DC-coupled inputs. IC Role / Device Role / Timing Role: Precision front-end converter accepting ±10 V inputs directly; REF IN driven by AD780 reference IC. Use Value: 77 dB SNR at 70 kHz supports >10-bit ENOB for 100 kHz bandwidth measurements - validated per IEEE 1057. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7894AR-10 | A-grade (±2 LSB relative accuracy) vs B-grade (±1.5 LSB); otherwise identical pinout, timing, and specs | Suitable where cost sensitivity outweighs tighter linearity requirement; same SO-8 footprint and layout | Select AD7894AR-10 for cost-optimized industrial designs where ±2 LSB error is acceptable |
| ADS8325IPW | 16-bit resolution, 2.5 µs conversion, SPI-compatible interface, but requires external reference and track/hold | Higher resolution needed for metrology; lacks integrated scaling for ±10 V - needs external op-amp conditioning | Choose ADS8325IPW only when 16-bit ENOB and lower THD (–92 dB) are mandatory; adds board area and BOM cost |
Compared with AD7894AR-10, the AD7894BRZ-10 delivers tighter linearity at identical price point and footprint; versus ADS8325IPW, it trades 2-bit resolution for integrated ±10 V scaling, lower power, and reduced system-level design effort.
Availability
AD7894BRZ-10 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable power quality analysis, and test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for AD7894BRZ-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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7894 product line delivers compact, single-supply 14-bit SAR ADCs optimized for space-constrained industrial and instrumentation applications where ±10 V input range, low power, and serial interface simplicity are critical.
FAQ
What is the maximum sampling rate achievable with AD7894BRZ-10?
The AD7894BRZ-10 supports a maximum sustained sampling rate of 160 kHz in Mode 1 operation. This requires a 16 MHz SCLK, 5 µs conversion time, 1.0 µs serial read (16 clocks), and 250 ns quiet time before the next CONVST falling edge - totaling 6.25 µs per cycle. Exceeding this rate degrades track/hold settling and violates specified dynamic performance.
Does AD7894BRZ-10 require an external reference voltage?
Yes, the AD7894BRZ-10 requires an external +2.5 V reference applied to the REF IN pin. The internal reference buffer accepts 2.375 V to 2.625 V with ≤1 µA input current. Recommended sources include the AD780 or AD680 precision references; reference errors directly contribute to gain error in the AD7894BRZ-10 transfer function.
How does the auto-power-down mode work in AD7894BRZ-10?
In Mode 2, the AD7894BRZ-10 automatically enters power-down (20 µA IDD) when CONVST remains low after conversion completes. A rising edge on CONVST triggers a ~5 µs wake-up period before the next falling edge initiates conversion. This eliminates software overhead for power management and reduces average power in low-duty-cycle applications.
What is the meaning of "B" in AD7894BRZ-10?
The "B" in AD7894BRZ-10 denotes the accuracy grade: ±1.5 LSB relative accuracy over –40°C to +85°C. This is tighter than the "A" grade (±2 LSB) and is verified per the AD7894 datasheet's B-version specifications table. The "RZ" suffix indicates SO-8 package with lead-free (Pb-free) finish and RoHS compliance.
Can AD7894BRZ-10 interface directly with a microcontroller GPIO without level-shifting?
Yes, the AD7894BRZ-10 logic inputs (CONVST, SCLK) accept 0.8 V low and 2.4 V high thresholds at VDD = 5 V ±5%, matching standard 5 V CMOS levels. Its SDATA output drives 4.0 V high (ISOURCE = 400 µA) and 0.4 V low (ISINK = 1.6 mA), fully compatible with 5 V microcontrollers - no level-shifting required.
AD7894BRZ-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:
- 14
- Sampling Rate (Per Second):
- 200k
- 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:
- -
AD7894BRZ-10 FAQ
1.How can I place an order for AD7894BRZ-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7894BRZ-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 AD7894BRZ-10 reliable?
The price and inventory of AD7894BRZ-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7894BRZ-10 is usually 5 days.
3.What payment methods are accepted for AD7894BRZ-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7894BRZ-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7894BRZ-10?
AD7894BRZ-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7894BRZ-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 AD7894BRZ-10?
For technical support, including AD7894BRZ-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7894BRZ-10 requirements.
6.How does Aetrix verify that AD7894BRZ-10 is sourced from the original manufacturer or authorized distributors?
All AD7894BRZ-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 AD7894BRZ-10 meets industry standards.
7.What is the process for return or replacement of AD7894BRZ-10?
All AD7894BRZ-10 units undergo pre-shipment inspection (PSI). If there is an issue with AD7894BRZ-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 AD7894BRZ-10 part is unused and in its original packaging.
Return procedure for AD7894BRZ-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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