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Analog Devices Inc. AD7893BNZ-2
- Part No.:
- AD7893BNZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7893BNZ-2.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
AD7893BNZ-2 from Analog Devices is a 12-bit, single-supply serial analog-to-digital converter (ADC) with 6 µs conversion time, on-chip track/hold amplifier, and 0 V to +2.5 V unipolar input range. It operates from a +5 V ±5% supply, consumes 25 mW typical power, and delivers 70 dB SNR at 10 kHz input - used in precision data acquisition systems requiring compact, low-power digitization of sensor or instrumentation signals.
For engineers reviewing the AD7893BNZ-2 datasheet, AD7893BNZ-2 pinout, AD7893BNZ-2 application, or AD7893BNZ-2 equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, validated alternatives, and supply support for industrial embedded and test equipment design.
Technical Context
The AD7893BNZ-2 implements a successive-approximation ADC core with an R-2R ladder DAC, integrated track/hold amplifier, and laser-trimmed internal clock oscillator - eliminating external timing components. Its analog input connects directly to the track/hold stage with ≤500 nA input current and no scaling resistors, enabling high-impedance 0 V to +2.5 V signal capture.
It uses a two-wire serial interface: SCLK clocks data out on rising edges, SDATA delivers 16-bit frames (4 leading zeros + 12-bit straight binary result), with data valid on falling SCLK edges. Conversion is edge-triggered via CONVST rising edge, and the part returns to track mode 6 µs later - requiring ≥600 ns hold-off before next CONVST for full-spec operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full operating range |
| Conversion Time | 6 µs max - enables up to 117 kHz sampling rate with proper timing control |
| Analog Input Range | 0 V to +2.5 V - unipolar range optimized for grounded-signal sources like sensors and DAC outputs |
| Reference Input | +2.5 V ±5% - external buffered reference; gain error scales with reference accuracy |
| Signal-to-(Noise+Distortion) | 70 dB min at fIN = 10 kHz - meets precision measurement requirements for 12-bit resolution |
| Power Dissipation | 25 mW typical - supports battery-powered or thermally constrained designs |
| Differential Nonlinearity | ±1 LSB max - ensures monotonic transfer function critical for closed-loop control |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. two's complement |
Pinout & Package
AD7893BNZ-2 is housed in an 8-pin plastic DIP (N-8) package, 0.3" wide, with through-hole mounting compatibility and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts +2.5 V ±5% buffered reference; input current ≤2 µA - requires stable, low-noise source (e.g., AD780) |
| 2 - VIN | Analog input channel | High-impedance node for 0 V to +2.5 V unipolar signals; input current ≤500 nA - no dynamic charging, suitable for high-Z sources |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC - must be star-connected to minimize noise coupling |
| 4 - SCLK | Serial clock input | External clock up to 8.33 MHz; rising edge clocks data out, falling edge validates data - timing-critical for read synchronization |
| 5 - SDATA | Serial data output | Three-state CMOS output delivering 16-bit frame (4 zeros + 12-bit result); disabled after 16th falling SCLK edge |
| 6 - DGND | Digital ground reference | Isolated ground for logic circuitry - must be connected to AGND at single point near device to avoid ground loops |
| 7 - CONVST | Convert start input | Falling edge resets serial counter; rising edge initiates conversion and triggers track→hold transition - aperture delay ≤15 ns |
| 8 - VDD | Positive supply | +5 V ±5% supply; draws ≤9 mA; decoupling capacitor required at pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤1.5 µs - eliminates need for external sample-and-hold in most applications |
| Single +5 V supply operation | Eliminates dual-rail supplies and level-shifting - reduces BOM count and layout complexity |
| High-speed serial interface | Two-wire (SCLK/SDATA) interface compatible with standard microcontroller SPI peripherals - no status pin required |
| LC2MOS process technology | Combines bipolar precision with CMOS low power - achieves 70 dB SNR and 25 mW typical dissipation in 8-pin package |
| Unipolar 0 V to +2.5 V input | Optimized for grounded-output transducers and DACs - avoids negative rail and simplifies front-end biasing |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Digitizing output of 4–20 mA loop-powered pressure or temperature transmitters conditioned to 0–2.5 V range. IC Role / Device Role / Timing Role: ADC front-end capturing analog sensor voltage with 12-bit resolution and minimal latency. Use Value: Enables direct connection to microcontroller SPI without external amplification or level-shifting - reducing component count and board area. |
Use Scenario: Battery-operated environmental monitor logging temperature, humidity, and light intensity at 100 Hz sampling. IC Role / Device Role / Timing Role: Low-power ADC performing periodic conversions triggered by timer interrupt. Use Value: 25 mW typical power and single +5 V supply extend battery life while maintaining 70 dB SNR for accurate long-term trend analysis. |
| Test Equipment Signal Capture | Medical Instrumentation Front-End |
Use Scenario: Capturing calibrated DC and low-frequency AC waveforms in handheld multimeters or oscilloscope probes. IC Role / Device Role / Timing Role: Precision digitizer acquiring stable readings with <±1 LSB differential nonlinearity. Use Value: 6 µs conversion time and on-chip track/hold allow accurate snapshot capture of slowly varying signals without external hold circuitry. |
Use Scenario: Converting amplified biopotential signals (ECG, EMG) referenced to patient ground into digital domain. IC Role / Device Role / Timing Role: Isolated analog input digitizer interfacing to isolated microcontroller via optocoupled serial lines. Use Value: 0 V to +2.5 V input range matches common isolated amplifier outputs - avoiding clipping and simplifying safety-certified design. |
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 |
|---|---|---|---|
| AD7893AR-2 | SOIC-8 package (vs. DIP); same electrical specs, ±1 LSB relative accuracy, 70 dB SNR | Surface-mount assembly; higher thermal impedance (170°C/W) vs. DIP (130°C/W) | Select for automated PCB assembly where space or reflow compatibility is prioritized over through-hole serviceability |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, but requires external reference and separate VREF pin; no on-chip track/hold | Higher speed but adds external components; different timing model and power sequencing | Select when throughput >117 kSPS is required and board space allows for reference IC and passive filtering |
Compared with AD7893AR-2, AD7893BNZ-2 offers through-hole reliability and lower thermal resistance; compared with ADS7822U, it integrates track/hold and reference buffering - reducing system-level component count and layout sensitivity at the cost of lower maximum sample rate.
Availability
AD7893BNZ-2 is available at Aetrix Electronics and suitable for industrial sensor interface, portable data logging, test equipment signal capture, and medical instrumentation front-end applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AD7893BNZ-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7893 family was designed as a space-optimized, low-power serial ADC solution for embedded data acquisition - integrating track/hold, conversion core, and serial interface in an 8-pin package to replace multi-chip alternatives.
FAQ
What is the input voltage range supported by the AD7893BNZ-2?
The AD7893BNZ-2 supports a unipolar analog input range of 0 V to +2.5 V. This is distinct from other variants like AD7893-10 (±10 V) or AD7893-5 (0 V to +5 V). The input presents high impedance (≤500 nA bias current) and connects directly to the on-chip track/hold amplifier without internal scaling resistors - making it ideal for grounded-output sensors and DACs. Reference voltage must be +2.5 V ±5% applied to the REF IN pin.
Does the AD7893BNZ-2 require an external clock source for conversion?
No, the AD7893BNZ-2 contains a laser-trimmed internal clock oscillator that drives the successive-approximation core - no external clock is needed for conversion timing. However, an external serial clock (SCLK) is required to read data from the SDATA pin. SCLK must be supplied by the host controller to shift out the 16-bit result; the part does not generate or output any clock signal. Conversion is initiated solely by the rising edge of the CONVST signal.
What is the output data format of the AD7893BNZ-2?
The AD7893BNZ-2 outputs data in straight (natural) binary format - not two's complement. Each conversion yields a 16-bit serial frame: four leading zero bits followed by the 12-bit result, with DB11 (MSB) first and DB0 (LSB) last. For example, a full-scale input (+2.5 V) produces 0x0FFF (0000 1111 1111 1111). This format simplifies firmware interpretation in microcontrollers without sign-extension logic.
Can the AD7893BNZ-2 operate from a 3.3 V supply?
No, the AD7893BNZ-2 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. Absolute maximum ratings prohibit VDD below 4.7 V or above 5.25 V for guaranteed performance. Logic inputs require VIH ≥2.4 V and VIL ≤0.8 V under these conditions; using 3.3 V logic levels without level translation may cause unreliable CONVST or SCLK recognition. A dedicated +5 V regulator or charge pump is required if the system main rail is 3.3 V.
How is the track/hold acquisition time relevant to system timing with the AD7893BNZ-2?
The AD7893BNZ-2 has a track/hold acquisition time of ≤1.5 µs - the time required for the amplifier to settle to 12-bit accuracy after returning to track mode (i.e., 6 µs after CONVST rising edge). To maintain full specification, the next CONVST rising edge must occur ≥600 ns after the end of the prior acquisition window. This imposes a minimum inter-conversion interval of 8.52 µs (117 kHz max throughput) when reading data post-conversion - violating this timing degrades SNR and increases code flicker.
AD7893BNZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 117k
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7893BNZ-2 FAQ
1.How can I place an order for AD7893BNZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BNZ-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 AD7893BNZ-2 reliable?
The price and inventory of AD7893BNZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BNZ-2 is usually 5 days.
3.What payment methods are accepted for AD7893BNZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BNZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BNZ-2?
AD7893BNZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BNZ-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 AD7893BNZ-2?
For technical support, including AD7893BNZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BNZ-2 requirements.
6.How does Aetrix verify that AD7893BNZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7893BNZ-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 AD7893BNZ-2 meets industry standards.
7.What is the process for return or replacement of AD7893BNZ-2?
All AD7893BNZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BNZ-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 AD7893BNZ-2 part is unused and in its original packaging.
Return procedure for AD7893BNZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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