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Analog Devices Inc. AD774BKNZ
- Part No.:
- AD774BKNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD774BKNZ.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,708
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Product details
Overview
AD774BKNZ from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter with on-chip 10 V reference, clock, and three-state output buffers. It supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges; achieves 8 µs max conversion time; operates from +5 V logic, ±12 V/±15 V analog supplies; and targets precision data acquisition in industrial control and test instrumentation.
For engineers reviewing the AD774BKNZ datasheet, AD774BKNZ pinout, AD774BKNZ application, or AD774BKNZ equivalent, key selection considerations include its industry-standard AD574A-compatible 28-pin DIP package, 12-bit resolution with ±1/2 LSB linearity (K grade), flexible 8-/12-bit parallel interface, and internal reference stability of 10.00 V ±1% with 10 ppm/°C TC.
Technical Context
The AD774BKNZ implements a SAR architecture with integrated current-output DAC, comparator, and laser-trimmed thin-film resistor network for scaling and bipolar offset. Its control logic supports full-control mode (CS/CE/R/C) and standalone mode (R/C edge-triggered), enabling direct interfacing to 8- and 16-bit microprocessor buses without external timing components.
It features on-chip voltage reference trimmed to 10.00 V ±1% with 2.0 mA drive capability, and uses BiMOS II process to integrate high-precision bipolar analog circuitry with CMOS digital logic. Input impedance is 5 kΩ (10 VIN) or 10 kΩ (20 VIN), and conversion accuracy is maintained across –40°C to +85°C for B-grade variants like AD774BKNZ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range |
| Conversion Time (max) | 8 µs - enables up to 125 kSPS throughput in high-speed data acquisition |
| Linearity Error (INL) | ±1/2 LSB - ensures monotonicity and no missing codes across temperature |
| Reference Voltage | 10.00 V ±1% - factory-trimmed internal reference eliminates need for external precision reference |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external resistor configuration at BIP OFF and REF IN |
| Supply Voltages | +5 V (VLOGIC), +12 V/+15 V (VCC), –12 V/–15 V (VEE) - dual-supply analog section supports bipolar signal handling |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments per B-grade specification |
Pinout & Package
AD774BKNZ is housed in a 28-lead plastic DIP (N-28) package with 0.6-inch width and standard through-hole footprint compatible with AD574A layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply input | Provides +5 V ±10% logic rail; powers internal buffers and control logic |
| 12/8 (Pin 2) | Digital mode select input | Configures output format: HIGH = 12-bit word, LOW = two 8-bit bytes |
| CS (Pin 3) | Chip Select input | Active LOW enables device for conversion or read operations |
| A0 (Pin 4) | Byte address/short cycle input | LOW initiates 12-bit conversion; HIGH enables 8-bit mode or selects DB7–DB4/DB3–DB0 during read |
| R/C (Pin 5) | Read/Convert control input | LOW starts conversion (standalone mode); HIGH reads data (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active HIGH initiates conversion or read cycle in full-control mode |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V input powering analog core, DAC, and reference |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% buffered reference; drives external loads ≤2.0 mA |
| AGND (Pin 9) | Analog ground | Common return for analog inputs, reference, and supplies; must be isolated from DGND |
| REF IN (Pin 10) | Reference input | Connected via 50 Ω resistor to REF OUT for internal reference use |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V input enabling bipolar input operation |
| BIP OFF (Pin 12) | Bipolar offset control | Connected to REF OUT (via 50 Ω) for bipolar mode; tied to AGND for unipolar mode |
| 10 VIN (Pin 13) | 10 V span analog input | Accepts 0 V–10 V (unipolar) or ±5 V (bipolar); 5 kΩ input impedance |
| 20 VIN (Pin 14) | 20 V span analog input | Accepts 0 V–20 V (unipolar) or ±10 V (bipolar); 10 kΩ input impedance |
| DGND (Pin 15) | Digital ground | Common return for digital I/O; must be connected to system digital ground plane |
| DB0–DB3 (Pins 16–19) | Digital output bits (LSB) | Output lower 4 bits when A0 = HIGH; tri-stated when A0 = LOW |
| DB4–DB7 (Pins 20–23) | Digital output bits (middle) | Output middle 4 bits in 12-bit mode; zero-padded in 8-bit mode when A0 = HIGH |
| DB8–DB11 (Pins 24–27) | Digital output bits (MSB) | Output upper 4 bits in both 12-bit and 8-bit modes; tri-stated only if disabled by control logic |
| STS (Pin 28) | Status output | Active HIGH during conversion; goes LOW when result is ready for read |
Key Features
| Feature | Design Value |
|---|---|
| Industry-standard AD574A pinout | Enables drop-in replacement in legacy systems without PCB redesign |
| Integrated 10 V reference with 10 ppm/°C TC | Eliminates external reference IC and reduces calibration drift in temperature-varying environments |
| Flexible parallel interface (8-/12-bit, byte-selectable) | Supports direct connection to 8-bit microcontrollers (e.g., 8051) and 16-bit processors (e.g., 68000) without glue logic |
| Laser-trimmed thin-film resistors | Guarantees calibrated input ranges and minimizes system-level trimming effort |
| Three-state output buffers | Allows direct bus sharing with multiple peripherals on shared data lines |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA sensor loops converted to voltage via precision shunt resistors in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC converting analog sensor outputs into 12-bit digital values for real-time control algorithms. Use Value: ±1/2 LSB linearity and 8 µs conversion enable accurate, high-throughput sampling of fast-changing process variables such as pressure or flow rate. | Use Scenario: Digitizing DC voltage outputs from programmable power supplies during functional testing of PCBAs. IC Role / Device Role / Timing Role: High-accuracy measurement front-end providing calibrated 0 V–10 V and ±5 V input support for multi-channel DVM subsystems. Use Value: Internal 10 V reference and laser-trimmed scaling eliminate external calibration components, reducing test head BOM and improving long-term measurement repeatability. |
| Medical Instrumentation | Avionics Data Acquisition |
Use Scenario: Converting analog outputs from biopotential amplifiers (ECG, EEG) in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision ADC capturing low-amplitude, high-impedance physiological signals with minimal added noise or offset drift. Use Value: Bipolar ±5 V input range and –40°C to +85°C operation support battery-powered field-deployable equipment requiring reliable performance across ambient conditions. | Use Scenario: Sampling transducer outputs (e.g., accelerometers, pressure sensors) in flight data recorders and engine health monitoring units. IC Role / Device Role / Timing Role: Ruggedized ADC performing deterministic conversions under vibration, EMI, and wide thermal cycling. Use Value: MIL-STD-883-compliant versions available; B-grade AD774BKNZ meets DO-160 environmental stress requirements when used with proper decoupling and layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7819BRZ | 12-bit SAR ADC with SPI interface, 1.2 µs conversion, single +3 V supply | Designed for low-power, space-constrained embedded systems; lacks parallel bus and internal reference | Select when board space, power budget, or modern microcontroller compatibility outweigh need for AD574A pin compatibility |
| MAX197BCNI+ | 12-bit multichannel ADC with internal reference, 6 µs conversion, 8-channel MUX, +5 V only | Integrates multiplexer and reference but uses different pinout and control protocol; not pin-compatible | Choose for multi-sensor systems requiring channel scanning without external MUX, accepting layout redesign |
Compared with AD774BKNZ, AD7819BRZ offers faster conversion and lower supply voltage but requires external reference and serial interface redesign, while MAX197BCNI+ adds channel multiplexing at the cost of non-compatible packaging and control logic-neither provides drop-in replacement capability.
Availability
AD774BKNZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-lifecycle support, and traceable sourcing of legacy-qualified analog ICs.
Supply support for AD774BKNZ 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, Inc. 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 AD774BKNZ belongs to Analog Devices' legacy high-accuracy parallel ADC product line, designed specifically for drop-in upgrades of AD574A-based systems requiring improved speed, reduced power, and enhanced temperature stability without board redesign.
FAQ
What is the maximum conversion time specified for the AD774BKNZ?
The AD774BKNZ has a maximum conversion time of 8 µs under all operating conditions across its rated temperature range (–40°C to +85°C). This value applies to both 12-bit and 8-bit conversion cycles and is guaranteed for the K-grade variant. The 8 µs spec enables sustained sampling rates up to 125 kSPS, making AD774BKNZ suitable for medium-speed data acquisition where deterministic latency matters. All timing parameters are tested with worst-case supply voltages at TMIN, 25°C, and TMAX.
Does the AD774BKNZ require external calibration components?
The AD774BKNZ does not require external calibration components for basic operation due to factory laser trimming of thin-film resistors for offset, gain, and bipolar scaling. Its internal 10 V reference is trimmed to ±1% accuracy with 10 ppm/°C TC, and input ranges are pre-calibrated. However, system-level trims (e.g., using R1/R2 in Figure 7) may be applied for tighter absolute accuracy. AD774BKNZ datasheet Figure 7 shows optional trimmer locations, but most industrial applications operate within spec using only the internal reference and default connections.
Is the AD774BKNZ pin-compatible with the AD574A?
Yes, the AD774BKNZ is fully pin-compatible with the industry-standard AD574A, sharing identical 28-pin DIP pinout, signal naming, and functional mapping. This allows direct replacement in existing designs without PCB modification. Key enhancements include faster 8 µs conversion (vs. 25 µs for AD574A), lower power consumption, improved linearity (±1/2 LSB vs. ±0.5 LSB typical), and tighter reference tolerance. All control timing waveforms remain compatible, though AD774BKNZ supports additional modes like standalone R/C triggering.
What are the supported analog input voltage ranges for the AD774BKNZ?
The AD774BKNZ supports four calibrated input ranges: 0 V to 10 V (unipolar), 0 V to 20 V (unipolar), –5 V to +5 V (bipolar), and –10 V to +10 V (bipolar). Selection is determined by external resistor configuration at BIP OFF and REF IN pins-not by internal register settings. For 10 V span, connect 10 VIN to AGND; for 20 V span, use 20 VIN. Input impedance is 5 kΩ (10 VIN) or 10 kΩ (20 VIN), and signals beyond supply rails are tolerated per absolute maximum ratings (±24 V on 20 VIN).
Can the AD774BKNZ operate from a single +5 V supply?
No, the AD774BKNZ cannot operate from a single +5 V supply. It requires three independent supplies: +5 V (VLOGIC, Pin 1), +12 V or +15 V (VCC, Pin 7), and –12 V or –15 V (VEE, Pin 11). The analog section uses dual ±12 V/±15 V rails to support bipolar input ranges and maintain DAC linearity; the digital interface runs from +5 V. Attempting single-supply operation will prevent proper comparator biasing, DAC current sourcing/sinking, and reference regulation-resulting in failed conversions or undefined output states.
AD774BKNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD774BKNZ FAQ
1.How can I place an order for AD774BKNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD774BKNZ 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 AD774BKNZ reliable?
The price and inventory of AD774BKNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD774BKNZ is usually 5 days.
3.What payment methods are accepted for AD774BKNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD774BKNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD774BKNZ?
AD774BKNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD774BKNZ 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 AD774BKNZ?
For technical support, including AD774BKNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD774BKNZ requirements.
6.How does Aetrix verify that AD774BKNZ is sourced from the original manufacturer or authorized distributors?
All AD774BKNZ 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 AD774BKNZ meets industry standards.
7.What is the process for return or replacement of AD774BKNZ?
All AD774BKNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD774BKNZ, 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 AD774BKNZ part is unused and in its original packaging.
Return procedure for AD774BKNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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