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Analog Devices Inc. AD774BTD/883B
- Part No.:
- AD774BTD/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD774BTD/883B.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
AD774BTD/883B 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 operates on ±12 V/±15 V analog supplies and +5 V logic supply, supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges, and delivers 8 µs maximum conversion time in military-grade –55°C to +125°C operation.
For engineers reviewing the AD774BTD/883B datasheet, AD774BTD/883B pinout, AD774BTD/883B application, or AD774BTD/883B equivalent, this page provides verified technical context, MIL-STD-883B-compliant specifications, pin-level interface guidance, and validated alternatives for high-reliability data acquisition systems requiring calibrated bipolar/unipolar measurement and direct microprocessor bus interfacing.
Technical Context
The AD774BTD/883B implements a SAR architecture with internal 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 both 12-bit and 8-bit read cycles via A0 and 12/8 pins.
It integrates a temperature-compensated 10.00 V ±1% reference with 10 ppm/°C typical drift, capable of sourcing up to 2.0 mA externally while maintaining stability during conversion. Input impedance is 5 kΩ for 10 V span and 10 kΩ for 20 V span, with analog inputs referenced to AGND (Pin 9) and digital I/O referenced to DGND (Pin 15).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range |
| Conversion Time | 8 µs max - enables high-throughput sampling in real-time control loops |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external connections without external op amps |
| Reference Voltage | 10.00 V ±1% - factory-trimmed, stable enough to eliminate external reference in most designs |
| Temperature Range | –55°C to +125°C - qualified per MIL-STD-883B for aerospace and defense applications |
| Linearity Error | ±1 LSB max - ensures monotonicity and predictable code transitions across full operating range |
| Power Supplies | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - requires triple-rail analog supply for full-range operation |
Pinout & Package
AD774BTD/883B is housed in a 28-lead hermetically sealed ceramic DIP package (D-28), rated for extended military temperature operation and suitable for high-reliability PCB assembly with lead finish compliant to MIL-STD-750.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply input | +5 V logic rail; must be decoupled directly to DGND (Pin 15) for noise immunity |
| 12/8 (Pin 2) | Digital mode select input | High = 12-bit word output; Low = two 8-bit byte reads (MSB first) |
| CS (Pin 3) | Chip Select input | Active-low enable for device selection in multi-converter bus systems |
| A0 (Pin 4) | Byte address/short cycle input | High = 8-bit conversion; Low = 12-bit conversion; also selects DB11–DB8 (Low) or DB3–DB0 (High) during read |
| R/C (Pin 5) | Read/Convert control | Low = start conversion (standalone mode); High = read data (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active-high strobe that initiates either conversion or read cycle when CS is asserted |
| VCC (Pin 7) | Analog positive supply | +12 V or +15 V analog rail; decouple to AGND (Pin 9) with 4.7 µF + 0.1 µF |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% source; drives REF IN (Pin 10) and BIP OFF (Pin 12); load ≤2.0 mA |
| AGND (Pin 9) | Analog ground reference | Common return for analog inputs (10VIN, 20VIN), REF IN, BIP OFF, and VEE |
| REF IN (Pin 10) | Reference input | Connected via 50 Ω to REF OUT for internal reference use; required for calibration |
| VEE (Pin 11) | Analog negative supply | –12 V or –15 V analog rail; decouple to AGND (Pin 9) |
| BIP OFF (Pin 12) | Bipolar offset control | Connect to REF OUT via 50 Ω for ±5 V/±10 V modes; tie to AGND for unipolar 0–10 V/0–20 V |
| 10 VIN (Pin 13) | 10 V span analog input | 0–10 V unipolar or ±5 V bipolar; input impedance = 5 kΩ; do not connect when using 20 VIN |
| 20 VIN (Pin 14) | 20 V span analog input | 0–20 V unipolar or ±10 V bipolar; input impedance = 10 kΩ; do not connect when using 10 VIN |
| DGND (Pin 15) | Digital ground reference | Common return for digital outputs (DB0–DB11), CS, CE, R/C, A0, 12/8, STS |
| DB0–DB3 (Pins 16–19) | Digital output bits (LSB) | Lower 4 bits; enabled only when A0 = High during read cycle |
| DB4–DB7 (Pins 20–23) | Digital output bits (mid) | Middle 4 bits; enabled when A0 = Low (DB4–DB7) or set to zero when A0 = High |
| DB8–DB11 (Pins 24–27) | Digital output bits (MSB) | Upper 4 bits; enabled when A0 = Low; disabled when A0 = High |
| STS (Pin 28) | Status output | Active-High during conversion; goes Low when result is ready and latched in output buffers |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Eliminates need for external precision reference; trimmed to ±1% and 10 ppm/°C drift |
| Three-state output buffers | Enables direct connection to 8-bit or 16-bit microprocessor buses without external latch or transceiver |
| Four calibrated input ranges | Hardware-selectable 0–10 V, 0–20 V, ±5 V, ±10 V - no external gain/offset circuitry required |
| Industry-standard AD574A pinout | Drop-in replacement for legacy systems; preserves existing PCB layout and firmware interface logic |
| MIL-STD-883B compliance | Qualified for high-reliability applications including avionics, missile guidance, and space-qualified electronics |
Applications
| Test & Measurement Instrumentation | Avionics Data Acquisition |
|---|---|
Use Scenario: High-accuracy voltage logging in benchtop multimeters and automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Primary ADC converting sensor outputs and calibration references into 12-bit digital words for FPGA or microcontroller processing. Use Value: ±1 LSB linearity and 8 µs conversion support sub-millisecond sampling rates with guaranteed monotonicity across –55°C to +125°C. | Use Scenario: Monitoring engine parameters (temperature, pressure, RPM) in flight control computers under extreme thermal cycling. IC Role / Device Role / Timing Role: Ruggedized front-end ADC interfacing with isolated analog sensors and feeding ARINC-429 or MIL-STD-1553 bus controllers. Use Value: MIL-STD-883B qualification and ±12 V/±15 V supply tolerance ensure functional integrity during aircraft power transients and wide ambient swings. |
| Industrial Process Control | Defense Radar Signal Conditioning |
Use Scenario: Analog input module in PLC backplanes acquiring 4–20 mA loop signals conditioned through precision resistors. IC Role / Device Role / Timing Role: Standalone-mode ADC triggered by programmable logic to digitize multiple channels sequentially. Use Value: Bipolar offset trimming and internal 10 V reference reduce component count and calibration labor in distributed I/O cabinets. | Use Scenario: Digitizing IF signals in phased-array radar receivers where dynamic range and timing predictability are critical. IC Role / Device Role / Timing Role: High-speed SAR ADC capturing pulse amplitude and timing with deterministic 8 µs latency. Use Value: 12-bit resolution with ±1 LSB INL and low-noise analog front-end design preserve SNR in RF receiver chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD781JRZ | Monolithic 12-bit sampling ADC with integrated sample-and-hold; 10 µs conversion; single +5 V supply; no internal reference | Designed for fast transient capture; lacks bipolar input support and MIL-STD-883B screening | Choose AD781JRZ when sampling speed >8 µs is unnecessary and system uses external reference and single-supply architecture |
| AD1674TQ | Pin-compatible 12-bit SAR ADC with 10 µs conversion; includes internal reference and trim capability; MIL-STD-883B qualified | Same D-28 ceramic package and AD574A pinout; slightly slower but offers improved full-scale calibration error (±0.05% FS vs. ±0.1% FS) | Choose AD1674TQ when tighter full-scale accuracy is required and 10 µs conversion is acceptable in the target system |
Compared with AD774BTD/883B, AD781JRZ simplifies power design but sacrifices bipolar range and military qualification, while AD1674TQ matches form, fit, and function with enhanced calibration performance at the cost of 2 µs longer conversion latency.
Availability
AD774BTD/883B is available at Aetrix Electronics and suitable for avionics data acquisition, industrial process control, and defense radar signal conditioning requiring stable component supply across extended temperature and long product lifecycles.
Supply support for AD774BTD/883B 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 defense markets since 1965.
The AD774BTD/883B belongs to Analog Devices' legacy high-reliability data converter family, engineered specifically for MIL-STD-883B-compliant applications demanding calibrated precision, triple-supply operation, and drop-in compatibility with AD574A-based systems.
FAQ
What is the maximum conversion time specification for AD774BTD/883B?
The AD774BTD/883B has a maximum conversion time of 8 µs across its full –55°C to +125°C operating range, as confirmed in the AD674B/AD774B–SPECIFICATIONS table under T Grade timing parameters. This value applies to the 12-bit cycle and is guaranteed under worst-case supply conditions (+12 V/–12 V/+5 V) and temperature extremes. The 8 µs figure distinguishes AD774BTD/883B from the slower AD674BTD/883B (15 µs max) and reflects its optimized SAR clock and buffer timing.
Does AD774BTD/883B require external components to operate as a complete ADC?
No, AD774BTD/883B is a complete monolithic 12-bit ADC requiring only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input connections, and control signals (CS, CE, R/C, A0, 12/8). It integrates a 10 V reference, clock generator, SAR logic, DAC, comparator, and three-state output buffers. External components like the 50 Ω resistor between REF OUT and REF IN or BIP OFF are part of the standard calibration path-not optional add-ons-and are specified in the AD774BTD/883B functional description.
How does the AD774BTD/883B support both unipolar and bipolar input ranges?
The AD774BTD/883B supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) ranges through hardware configuration: tie BIP OFF (Pin 12) to AGND (Pin 9) for unipolar; connect it to REF OUT (Pin 8) via 50 Ω for bipolar. Input selection is made by applying signal to 10 VIN (Pin 13) or 20 VIN (Pin 14), with corresponding input impedances of 5 kΩ and 10 kΩ. These configurations are explicitly defined in the PIN FUNCTION DESCRIPTIONS and CIRCUIT OPERATION sections of the datasheet.
Is AD774BTD/883B pin-compatible with the AD574A?
Yes, AD774BTD/883B uses the industry-standard AD574A pinout as stated in the PRODUCT DESCRIPTION and PRODUCT HIGHLIGHTS sections. Pin assignments for VLOGIC, CS, CE, R/C, A0, 12/8, REF OUT, REF IN, BIP OFF, 10 VIN, 20 VIN, STS, DB0–DB11, AGND, DGND, VCC, and VEE match AD574A exactly. This enables drop-in replacement in legacy systems without PCB redesign, though users must verify supply voltage compatibility (+12/+15 V vs. older ±15 V requirements) and timing margins.
What is the purpose of the STS pin on AD774BTD/883B?
The STS (Status) pin (Pin 28) is an active-high open-collector output that signals conversion progress: it goes HIGH when a conversion is initiated (via R/C or CE) and remains HIGH until the 12-bit result is fully settled and latched in the output buffers, at which point it goes LOW. This provides hardware handshaking for microprocessors or FPGAs to know precisely when valid data is available on DB0–DB11, eliminating polling overhead. Its timing relationship to CE and R/C is detailed in Figure 1 (Convert Start Timing) and Figure 4a/b (Standalone Mode Timing).
AD774BTD/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD774BTD/883B FAQ
1.How can I place an order for AD774BTD/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD774BTD/883B 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 AD774BTD/883B reliable?
The price and inventory of AD774BTD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD774BTD/883B is usually 5 days.
3.What payment methods are accepted for AD774BTD/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD774BTD/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD774BTD/883B?
AD774BTD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD774BTD/883B 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 AD774BTD/883B?
For technical support, including AD774BTD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD774BTD/883B requirements.
6.How does Aetrix verify that AD774BTD/883B is sourced from the original manufacturer or authorized distributors?
All AD774BTD/883B 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 AD774BTD/883B meets industry standards.
7.What is the process for return or replacement of AD774BTD/883B?
All AD774BTD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD774BTD/883B, 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 AD774BTD/883B part is unused and in its original packaging.
Return procedure for AD774BTD/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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