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Analog Devices Inc. AD7893BN-2
- Part No.:
- AD7893BN-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7893BN-2.pdf
- Description:
- IC ADC 12BIT SRL T/H LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,533
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Product details
Overview
AD7893BN-2 from Analog Devices is a 12-bit, serial-output analog-to-digital converter with 6 µs conversion time, single +5 V supply operation, and on-chip track/hold amplifier. It accepts 0 V to +2.5 V unipolar input range, delivers straight binary output coding, and achieves ±1/2 LSB relative accuracy and 72 dB SNR at 10 kHz - used in precision data acquisition systems for industrial sensor interfacing.
For engineers reviewing the AD7893BN-2 datasheet, AD7893BN-2 pinout, AD7893BN-2 application, or AD7893BN-2 equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and DC specifications, real-world use scenarios, and two rigorously cross-checked alternative parts for unipolar 0–2.5 V, 12-bit serial ADC designs.
Technical Context
The AD7893BN-2 implements a successive-approximation ADC core with an R-2R ladder DAC, integrated track/hold amplifier, and laser-trimmed internal clock oscillator. Its analog front-end directly accepts 0 V to +2.5 V inputs with <500 nA input current and no external scaling resistors.
It uses a two-wire serial interface: SCLK controls timing, and SDATA outputs 16-bit frames (4 leading zeros + 12-bit straight binary result), with data valid on the falling edge of SCLK and three-state disable after the 16th falling edge.
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 margin |
| Analog Input Range | 0 V to +2.5 V - requires external +2.5 V reference; no input biasing network needed |
| Relative Accuracy | ±1/2 LSB max - ensures high linearity for precision measurement applications |
| Signal-to-(Noise+Distortion) | 72 dB min at fIN = 10 kHz - meets requirements for medium-speed instrumentation |
| Power Dissipation | 25 mW typical - supports low-power portable and battery-operated systems |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. two's complement |
Pinout & Package
AD7893BN-2 is housed in an 8-pin plastic mini-DIP (N-8 package), 0.3" wide, with through-hole mounting compatibility and standard DIP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; gain and offset errors scale with reference accuracy |
| 2 - VIN | Analog input channel | High-impedance input for 0 V to +2.5 V unipolar signals; <500 nA input current |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC; must be isolated from DGND |
| 4 - SCLK | Serial clock input | External clock up to 8.33 MHz; rising edge clocks out data, falling edge validates data |
| 5 - SDATA | Serial data output | Three-state output delivering 16-bit frame (4 zeros + 12-bit result); disabled after 16th falling SCLK edge |
| 6 - DGND | Digital ground reference | Ground return for logic circuitry; must connect to system digital ground plane |
| 7 - CONVST | Convert start input | Falling edge resets serial counter; rising edge initiates track-to-hold and starts conversion |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; IDD ≤ 9 mA max |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤1.5 µs - eliminates need for external THA in most 100 kSPS designs |
| Single-supply +5 V 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 most microcontrollers - saves GPIO pins and simplifies routing |
| LC2MOS process technology | Combines bipolar precision with CMOS low power - achieves 72 dB SNR and 25 mW typical dissipation |
| Unipolar 0 V to +2.5 V input | No external resistor network required - direct connection to sensors with 0–2.5 V output range |
Applications
| Industrial Sensor Signal Conditioning | Portable Data Logger Front-End |
|---|---|
Use Scenario: Digitizing output from 0–2.5 V pressure, temperature, or strain sensors in factory-floor PLC modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor voltage with 12-bit resolution and 117 kHz throughput; track/hold holds signal during 6 µs conversion. Use Value: ±1/2 LSB linearity ensures accurate calibration traceability; straight binary output reduces firmware overhead in real-time control loops. | Use Scenario: Battery-powered environmental monitor acquiring thermistor and humidity sensor outputs at 10–50 kSPS. IC Role / Device Role / Timing Role: Low-power ADC enabling extended runtime; single +5 V supply interfaces directly with LDO-regulated battery rail. Use Value: 25 mW typical power allows >100 hours of continuous logging on two AA cells; 8-pin DIP eases hand-soldering in prototype builds. |
| Medical Instrumentation Input Stage | Test & Measurement Equipment Channel |
Use Scenario: Converting amplified biopotential signals (ECG, EMG) within FDA-cleared diagnostic devices requiring 0–2.5 V input compliance. IC Role / Device Role / Timing Role: Precision ADC stage preceding digital filtering and analysis; operates with AD780 reference for stable 2.5 V reference. Use Value: 72 dB SNR at 10 kHz meets IEC 60601-2-27 immunity requirements for clinical-grade signal fidelity. | Use Scenario: Channel ADC in benchtop multimeter or waveform analyzer accepting calibrated 0–2.5 V analog inputs. IC Role / Device Role / Timing Role: High-linearity digitizer synchronized to system master clock via CONVST edge-triggering. Use Value: 6 µs conversion + 1.5 µs acquisition enables deterministic 117 kHz sampling without jitter-induced aliasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7893AN-2 | Same package and pinout; ±1 LSB relative accuracy (vs. ±1/2 LSB for AD7893BN-2); 70 dB SNR | Lower-cost option where ±1 LSB linearity suffices; suitable for non-critical sensor readout | Select AD7893AN-2 when budget constraints outweigh need for highest linearity |
| ADS7822U | 8-pin SOIC; 12-bit, 200 kSPS; SPI-compatible; 2.7–5.25 V supply; 0–VREF input; ±1 LSB INL | Higher speed and wider supply range; requires external reference; no integrated track/hold | Choose ADS7822U when higher throughput or flexible supply voltage is prioritized over integrated THA |
Compared with AD7893AN-2, the AD7893BN-2 delivers tighter linearity and improved SNR for metrology-grade measurements; compared with ADS7822U, it integrates a track/hold and uses simpler timing but trades off maximum sample rate and supply flexibility.
Availability
AD7893BN-2 is available at Aetrix Electronics and suitable for industrial sensor conditioning, portable data loggers, medical instrumentation input stages, and test equipment channels requiring stable component supply across long production lifecycles.
Supply support for AD7893BN-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 specifically for space-constrained, low-power, high-accuracy data acquisition systems requiring integrated track/hold and serial interface in minimal pin count - targeting industrial, medical, and portable instrumentation.
FAQ
What is the input voltage range supported by the AD7893BN-2?
The AD7893BN-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 device requires an external +2.5 V reference applied to the REF IN pin, and its input stage has high impedance with <500 nA input current - making it ideal for direct connection to low-output-impedance sensors.
Does the AD7893BN-2 include an integrated track/hold amplifier?
Yes, the AD7893BN-2 includes a fully integrated track/hold amplifier optimized for 12-bit accuracy. It acquires the input signal to within ±1/2 LSB in ≤1.5 µs after conversion ends or after a step change at VIN. The track/hold transitions automatically from track to hold on the rising edge of CONVST, eliminating the need for external components in most 100 kSPS applications.
What output coding format does the AD7893BN-2 use?
The AD7893BN-2 uses straight (natural) binary output coding - not two's complement. Its 16-bit serial frame consists of four leading zeros followed by the 12-bit result, with DB11 (MSB) first and DB0 (LSB) last. This simplifies firmware interpretation in microcontroller-based systems, especially when interfacing with unsigned integer arithmetic or display drivers.
What is the maximum recommended serial clock frequency for the AD7893BN-2?
The AD7893BN-2 supports a maximum serial clock (SCLK) frequency of 8.33 MHz. At this rate, the full 16-bit read cycle completes in 1.92 µs. To maintain specification compliance, the read operation must not overlap conversion or occur within 600 ns before the next CONVST rising edge - resulting in a minimum total throughput time of 8.52 µs (117 kHz).
How does the AD7893BN-2 handle reference voltage requirements?
The AD7893BN-2 requires a precise +2.5 V reference applied to the REF IN pin, with tolerance of ±5% (2.375 V to 2.625 V). The reference input is buffered on-chip with ≤1 µA input current. Reference inaccuracies directly cause gain errors in the transfer function; thus, high-stability references like the AD780 or AD680 are recommended to preserve the ±1/2 LSB relative accuracy of the AD7893BN-2.
AD7893BN-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:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7893BN-2 FAQ
1.How can I place an order for AD7893BN-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BN-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 AD7893BN-2 reliable?
The price and inventory of AD7893BN-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BN-2 is usually 5 days.
3.What payment methods are accepted for AD7893BN-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BN-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BN-2?
AD7893BN-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BN-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 AD7893BN-2?
For technical support, including AD7893BN-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BN-2 requirements.
6.How does Aetrix verify that AD7893BN-2 is sourced from the original manufacturer or authorized distributors?
All AD7893BN-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 AD7893BN-2 meets industry standards.
7.What is the process for return or replacement of AD7893BN-2?
All AD7893BN-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BN-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 AD7893BN-2 part is unused and in its original packaging.
Return procedure for AD7893BN-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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