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Analog Devices Inc. AD774BKN
- Part No.:
- AD774BKN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD774BKN.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
AD774BKN 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 instrumentation and test equipment.
For engineers reviewing the AD774BKN datasheet, AD774BKN pinout, AD774BKN application, or AD774BKN equivalent, key selection criteria include its 8 µs conversion speed, ±1/2 LSB integral linearity (K-grade), industry-standard AD574A-compatible 28-pin DIP package, and support for both standalone and microprocessor-controlled operation modes.
Technical Context
The AD774BKN implements a SAR architecture with internal 10 V reference trimmed to ±1% and 10 ppm/°C drift, enabling calibrated unipolar and bipolar conversions without external components. Its dual-mode digital interface supports 12-bit word or byte-wide (8+4) reads via R/C, CS, CE, A0, and 12/8 control lines.
Conversion is initiated by R/C falling edge in standalone mode or CE high pulse in full-control mode; status is reported via STS pin. Input impedance is 5 kΩ (10 VIN) or 10 kΩ (20 VIN); reference output drives up to 2.0 mA while maintaining stability during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete codes over full-scale range |
| Conversion Time | 8 µs max - enables ≥125 kSPS sampling in burst mode |
| Integral Linearity Error | ±1/2 LSB - ensures monotonicity and no missing codes across temperature |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external pin connections |
| Reference Voltage | 10.00 V ±1% - factory-trimmed, low-drift source for DAC and scaling |
| Supply Voltages | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - supports mixed-signal system integration |
| Package | 28-pin plastic DIP (N-28) - industry-standard footprint compatible with AD574A PCB layouts |
Pinout & Package
AD774BKN is housed in a 28-pin plastic dual in-line package (DIP), N-28 option, with 0°C to +70°C operating range and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply | +5 V ±10% logic rail; powers internal buffers and control logic |
| 12/8 (Pin 2) | Data format select | LOW = two 8-bit bytes; HIGH = single 12-bit word output |
| CS (Pin 3) | Chip Select input | Active LOW; enables device for read/convert commands when CE is asserted |
| A0 (Pin 4) | Byte address/short cycle | HIGH = 8-bit conversion; LOW = full 12-bit conversion; also selects DB11–DB8 or DB3–DB0 during read |
| R/C (Pin 5) | Read/Convert control | LOW = start conversion (standalone); HIGH = read data (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active HIGH; initiates conversion or read cycle in conjunction with CS and R/C |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V ±10%; powers SAR, DAC, and comparator circuitry |
| REF OUT (Pin 8) | 10 V reference output | Stable 10.00 V ±1% source; drives REF IN and BIP OFF; supports 2.0 mA external load |
| 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 to REF OUT via 50 Ω resistor; sets full-scale gain and offset calibration point |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V ±10%; required for bipolar operation and comparator biasing |
| BIP OFF (Pin 12) | Bipolar offset adjust | Connected to REF OUT (bipolar) or AGND (unipolar) via 50 Ω; sets zero-crossing point |
| 10 VIN (Pin 13) | 10 V span analog input | 0 V–10 V unipolar or ±5 V bipolar; 5 kΩ input impedance; not used with 20 VIN |
| 20 VIN (Pin 14) | 20 V span analog input | 0 V–20 V unipolar or ±10 V bipolar; 10 kΩ input impedance; not used with 10 VIN |
| DGND (Pin 15) | Digital ground | Common return for digital I/O; must be connected to system digital ground plane |
| DB0–DB3 (Pins 16–19) | Data outputs (LSB) | Lower 4 bits; enabled during read when A0 = HIGH; three-state buffered |
| DB4–DB7 (Pins 20–23) | Data outputs (mid) | Middle 4 bits; enabled when A0 = LOW (12-bit) or A0 = LOW (8-bit byte 1) |
| DB8–DB11 (Pins 24–27) | Data outputs (MSB) | Upper 4 bits; enabled when A0 = LOW (12-bit) or A0 = LOW (8-bit byte 1) |
| STS (Pin 28) | Status output | Active HIGH during conversion; goes LOW at completion; used for interrupt or polling |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | 10.00 V ±1% with 10 ppm/°C drift - eliminates need for external precision reference |
| AD574A pin compatibility | Direct drop-in replacement - preserves legacy PCB designs and reduces redesign risk |
| Flexible digital interface | Supports 8-bit microprocessors (two-byte read) and 16-bit systems (single 12-bit word) |
| Four calibrated input ranges | Hardware-selectable 0–10 V, 0–20 V, ±5 V, ±10 V - simplifies front-end signal conditioning |
| Three-state output buffers | Enables direct connection to shared data bus without external transceivers or isolation |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage/current measurement from sensors in PLC-based control cabinets with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs (4–20 mA loops, thermocouples) into 12-bit digital values for real-time PID processing. Use Value: 8 µs conversion time allows >100 kSPS throughput per channel; ±1/2 LSB linearity ensures <0.012% full-scale error in closed-loop feedback accuracy. | Use Scenario: High-speed parametric testing of semiconductor devices requiring precise DC voltage stimulus and measurement. IC Role / Device Role / Timing Role: Digitizing reference voltages and DUT responses in multi-channel fixture boards with synchronized trigger timing. Use Value: Standalone mode (R/C-triggered) enables deterministic latency; 10 V internal reference provides traceable calibration without external standards. |
| Medical Instrumentation | Power Supply Monitoring |
Use Scenario: Analog front-end in portable patient monitors measuring ECG, SpO₂, and temperature with battery-powered operation. IC Role / Device Role / Timing Role: Converting conditioned biopotential signals into digital domain for filtering and display; operates from isolated ±12 V rails. Use Value: Bipolar ±5 V input range supports AC-coupled bio-signals; low power consumption (375 mW max) extends battery life. | Use Scenario: Real-time monitoring of output voltage and current in programmable lab power supplies with digital control loop. IC Role / Device Role / Timing Role: Sampling sense resistors and reference taps to compute regulation error and adjust PWM duty cycle. Use Value: 0–20 V unipolar range accommodates 0–18 V output with margin; 12-bit resolution yields 4.88 mV step size for <0.1% setpoint accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD781JRZ | 12-bit, 10 µs conversion, integrated sample-and-hold, SOIC-24 package | Eliminates need for external S/H; lower pin count but no bipolar offset support | Preferred when input signal bandwidth exceeds 100 kHz or when board space is constrained |
| AD1674KN | 12-bit, 10 µs conversion, pin-compatible with AD574A/AD774B, includes internal S/H | Same 28-pin DIP footprint; adds sampling capability without external components | Best choice when replacing aging AD574A systems requiring improved dynamic performance |
Compared with AD774BKN, AD781JRZ offers integrated sampling but lacks bipolar input support and uses a different package, while AD1674KN retains identical pinout and adds sample-and-hold-making it ideal for upgrading legacy AD574A designs without layout changes.
Availability
AD774BKN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and power supply monitoring requiring stable component supply across commercial temperature grades.
Supply support for AD774BKN 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, serving industrial, automotive, communications, and healthcare markets.
The AD774BKN belongs to Analog Devices' legacy precision ADC product line, designed specifically for high-accuracy, medium-speed data acquisition in systems where integration, reliability, and pin compatibility with industry-standard converters are critical.
FAQ
What is the maximum conversion time specification for the AD774BKN?
The AD774BKN has a maximum conversion time of 8 µs under all operating conditions across its 0°C to +70°C temperature range. This value is guaranteed for both 8-bit and 12-bit conversion cycles and is tested at final electrical test with worst-case supply voltages at TMIN, 25°C, and TMAX. The AD774BKN achieves this speed while maintaining ±1/2 LSB integral linearity, making it faster than the AD674B (15 µs max) and suitable for applications requiring >125 kSPS throughput.
Does the AD774BKN require external components to operate as a complete ADC solution?
No, the AD774BKN requires no external components to perform full 12-bit analog-to-digital conversion. It integrates a precision 10 V reference, internal clock, successive-approximation register, DAC, comparator, and three-state output buffers. Only power supplies (+5 V, ±12 V/±15 V), analog input connections (10 VIN or 20 VIN), and control signals (R/C, CE, CS, A0, 12/8) are needed. External resistors (e.g., 50 Ω between REF OUT and REF IN) are used only for calibration-not basic operation.
How does the AD774BKN support both unipolar and bipolar input ranges?
The AD774BKN supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) ranges through hardware configuration: connect BIP OFF to AGND for unipolar mode or to REF OUT via 50 Ω for bipolar mode; apply signal to 10 VIN (5 kΩ) or 20 VIN (10 kΩ). The internal laser-trimmed scaling and offset resistors ensure calibrated transitions-first code at +1/2 LSB (unipolar) or –1/2 LSB (bipolar)-without software compensation.
Is the AD774BKN pin-compatible with the AD574A, and what advantages does it offer?
Yes, the AD774BKN uses the exact same 28-pin DIP pinout as the industry-standard AD574A, enabling direct PCB replacement. It improves upon the AD574A with 8 µs max conversion time (vs. 25 µs), lower power consumption (375 mW vs. ~500 mW), tighter ±1/2 LSB linearity (K-grade), and enhanced noise immunity due to BiMOS II process integration. No layout or firmware changes are required for migration.
What is the role of the STS pin on the AD774BKN, and how is it used in system design?
The STS (Status) pin on the AD774BKN is an active-HIGH open-collector output that signals conversion progress: it goes HIGH when a conversion starts and returns LOW when complete. In microprocessor systems, STS can trigger an interrupt or be polled to synchronize data reads. In standalone mode, it provides visual or logic-level confirmation of conversion status-enabling deterministic timing without additional timing components or software delays. Its behavior is fully defined in the AD774BKN timing diagrams.
AD774BKN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD774BKN FAQ
1.How can I place an order for AD774BKN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD774BKN 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 AD774BKN reliable?
The price and inventory of AD774BKN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD774BKN is usually 5 days.
3.What payment methods are accepted for AD774BKN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD774BKN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD774BKN?
AD774BKN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD774BKN 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 AD774BKN?
For technical support, including AD774BKN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD774BKN requirements.
6.How does Aetrix verify that AD774BKN is sourced from the original manufacturer or authorized distributors?
All AD774BKN 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 AD774BKN meets industry standards.
7.What is the process for return or replacement of AD774BKN?
All AD774BKN units undergo pre-shipment inspection (PSI). If there is an issue with AD774BKN, 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 AD774BKN part is unused and in its original packaging.
Return procedure for AD774BKN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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