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Analog Devices Inc. AD774BBRZ
- Part No.:
- AD774BBRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD774BBRZ.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
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Product details
Overview
AD774BBRZ from Analog Devices is a complete monolithic 12-bit successive-approximation ADC with on-chip 10 V reference, clock, and three-state digital output buffers. It supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges, operates from ±12 V/±15 V analog and +5 V logic supplies, and achieves 8 µs max conversion time. It is used in precision data acquisition systems requiring direct microprocessor bus interface and calibrated analog input scaling.
For engineers reviewing the AD774BBRZ datasheet, AD774BBRZ pinout, AD774BBRZ application, or AD774BBRZ equivalent, key selection considerations include its 12-bit resolution with ±1/2 LSB linearity (B grade), industry-standard AD574A-compatible 28-pin SOIC package, flexible 8-/12-bit data read modes, and internal reference stability of 10.00 V ±1% with 10 ppm/°C typical TC.
Technical Context
The AD774BBRZ 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 both 8-bit and 16-bit microprocessors via configurable byte-addressing (A0) and data format selection (12/8).
It features active laser trimming for offset, linearity, and full-scale calibration across temperature; the B-grade version is specified from –40°C to +85°C and guarantees ±1/2 LSB differential linearity and no missing codes over that range. The internal 10 V reference drives up to 2.0 mA externally while maintaining <1% initial error and low drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with nominal 2.44 mV/LSB (10 V span) or 4.88 mV/LSB (20 V span) |
| Conversion Time (max) | 8 µs - enables ≥125 kSPS throughput in high-speed data logging and closed-loop control |
| Linearity Error (INL) | ±1/2 LSB - ensures monotonicity and accurate code transition placement across full scale |
| Input Ranges | 0 V–10 V, 0 V–20 V, ±5 V, ±10 V - selectable via external connections without external op amps or gain stages |
| Reference Voltage | 10.00 V ±1% - factory-trimmed, temperature-compensated, and available at REF OUT for system-level reference distribution |
| Supply Voltages | +5 V (VLOGIC), +12/+15 V (VCC), –12/–15 V (VEE) - dual-supply analog section enables true bipolar operation |
| Package | 28-lead plastic SOIC (R-28) - industry-standard footprint compatible with AD574A layout and reflow assembly |
Pinout & Package
AD774BBRZ is housed in a 28-lead plastic SOIC (R-28) package with standard 0.3-inch body width and 0.050-inch lead pitch. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital power supply input | Supplies +5 V to internal logic and output buffers; must be decoupled to DGND (Pin 15) with 4.7 µF + 0.1 µF |
| 12/8 (Pin 2) | Digital mode select input | High = 12-bit parallel output; Low = two 8-bit reads (MSB first, then LSB with zero-padded upper nibble) |
| CS (Pin 3) | Chip Select input | Active-low enable for device addressing in multi-device bus systems; requires setup before CE assertion |
| A0 (Pin 4) | Byte address/short cycle control | High during convert start = 8-bit cycle; Low = 12-bit cycle; during read = selects MSB or LSB byte |
| R/C (Pin 5) | Read/Convert control | Low = initiate conversion (standalone mode); High = enable data read (full-control mode) |
| CE (Pin 6) | Chip Enable input | Active-high signal that gates R/C function; must meet timing specs (e.g., tHEC ≥50 ns pulse width) |
| VCC (Pin 7) | Positive analog supply | +12 V or +15 V input for analog circuitry; decouple directly to AGND (Pin 9) |
| REF OUT (Pin 8) | Analog reference output | 10.00 V ±1% source for internal DAC and external use; capable of driving ≤2.0 mA load |
| AGND (Pin 9) | Analog ground reference | Common return for analog inputs, reference, and supplies; must be isolated from DGND except at single point |
| REF IN (Pin 10) | Reference input | Connected via 50 Ω resistor to REF OUT for normal operation; sets DAC full-scale current |
| VEE (Pin 11) | Negative analog supply | –12 V or –15 V input; powers comparator and analog front-end; decouple to AGND |
| BIP OFF (Pin 12) | Bipolar offset configuration | Connect to REF OUT (via 50 Ω) for ±5 V/±10 V operation; connect to AGND for unipolar 0–10 V/0–20 V |
| 10 VIN (Pin 13) | 10 V span analog input | Accepts 0–10 V (unipolar) or –5 to +5 V (bipolar); input impedance ≈5 kΩ; not used with 20 VIN active |
| 20 VIN (Pin 14) | 20 V span analog input | Accepts 0–20 V (unipolar) or –10 to +10 V (bipolar); input impedance ≈10 kΩ; not used with 10 VIN active |
| DGND (Pin 15) | Digital ground reference | Return for digital I/O and VLOGIC; separate from AGND to minimize noise coupling into analog section |
| DB0–DB3 (Pins 16–19) | Data outputs (LSB) | Lower 4 bits; enabled only when A0 = HIGH during read; three-state controlled by CE/R/C |
| DB4–DB7 (Pins 20–23) | Data outputs (middle) | Middle 4 bits; enabled when A0 = LOW (MSB byte) or all zeros when A0 = HIGH (LSB byte) |
| DB8–DB11 (Pins 24–27) | Data outputs (MSB) | Upper 4 bits; always active in 12-bit mode; driven as MSB byte when A0 = LOW in 8-bit mode |
| STS (Pin 28) | Status output | Active-high open-drain signal indicating conversion in progress; goes low within 8 µs of completion |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Factory-trimmed to 10.00 V ±1% with 10 ppm/°C typical TC; eliminates need for external reference and reduces BOM count |
| AD574A pin compatibility | Direct drop-in replacement for legacy AD574A designs-same 28-pin SOIC footprint and signal mapping-enabling upgrade without PCB change |
| Flexible microprocessor interface | Supports 8-bit and 16-bit buses via programmable 8-/12-bit read cycles and byte-addressing (A0), reducing software overhead in embedded systems |
| Laser-trimmed analog resistors | Thin-film resistors trimmed for offset, linearity, and full-scale calibration-guarantees ±1/2 LSB INL and no missing codes over –40°C to +85°C |
| Four calibrated input ranges | Hardware-selectable 0–10 V, 0–20 V, ±5 V, ±10 V operation without external gain/level-shift circuitry-reduces design complexity and board area |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC-based control cabinets with 4–20 mA or voltage transmitters. IC Role / Device Role / Timing Role: Primary ADC digitizing analog process signals with calibrated 0–10 V input range and ±1/2 LSB linearity to ensure traceable measurement accuracy. Use Value: Eliminates external reference and scaling resistors, reducing calibration drift and long-term maintenance in harsh industrial environments. | Use Scenario: Digitizing analog waveforms and DC levels in benchtop multimeters, oscilloscopes, and automated test systems requiring 12-bit resolution and fast settling. IC Role / Device Role / Timing Role: High-speed 12-bit sampling core with 8 µs conversion time and three-state outputs for direct GPIB or ISA bus interfacing. Use Value: Enables sub-10 µs per-sample throughput with guaranteed monotonicity-critical for FFT-based spectral analysis and pass/fail go/no-go testing. |
| Avionics Sensor Interface | Medical Diagnostic Instrumentation |
Use Scenario: Converting outputs from accelerometers, gyros, and altimeters in flight data recorders and inertial navigation units operating across –40°C to +85°C. IC Role / Device Role / Timing Role: B-grade ADC providing calibrated ±5 V bipolar input support and MIL-STD-883-compliant variants for extended reliability. Use Value: Laser-trimmed thin-film resistors maintain accuracy over wide temperature excursions-no recalibration needed between flights. | Use Scenario: Acquiring ECG, EEG, and blood pressure signals in portable diagnostic devices where size, power, and absolute accuracy are critical. IC Role / Device Role / Timing Role: Precision analog front-end ADC with internal 10 V reference and low-noise analog section meeting IEC 60601-2-27 immunity requirements. Use Value: Integrated reference and trimming reduce component count and improve channel-to-channel matching in multi-lead patient monitors. |
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 |
|---|---|---|---|
| AD7819BRZ | 12-bit, 1.5 µs conversion, single +5 V supply, no internal reference, SPI interface | Designed for low-power, space-constrained embedded systems; lacks bipolar input and on-chip reference | Select when speed >8 µs and supply simplicity outweigh need for calibrated bipolar ranges and reference integration |
| ADS7800U | 12-bit, 10 µs conversion, ±5 V supplies, internal reference, parallel interface, 28-pin DIP only | Same pinout as AD574A but not AD774B; no SOIC option; higher power consumption (500 mW) | Select for legacy DIP-based designs needing identical mechanical fit but tolerating slower conversion and larger footprint |
Compared with AD774BBRZ, AD7819BRZ offers faster conversion and lower supply count but requires external reference and cannot support ±10 V inputs; ADS7800U provides similar functionality in DIP but lacks SOIC packaging and has 25% longer conversion time-making AD774BBRZ optimal for new industrial designs demanding calibrated bipolar operation in surface-mount form.
Availability
AD774BBRZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interface, and medical diagnostic instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD774BBRZ 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 since 1965.
The AD774BBRZ belongs to Analog Devices' legacy precision ADC product line, designed specifically for high-accuracy, microprocessor-integrated data acquisition in environments where calibrated input ranges, internal reference stability, and AD574A compatibility are essential.
FAQ
What is the maximum conversion time specification for AD774BBRZ?
The AD774BBRZ 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 the full 12-bit conversion cycle and is guaranteed for the B-grade version. The 8 µs spec enables sustained sampling rates above 125 kSPS and supports real-time control loops in industrial automation systems using the AD774BBRZ.
Does AD774BBRZ require external calibration components?
No, the AD774BBRZ does not require external calibration components for basic operation. Its laser-trimmed thin-film resistors provide factory-calibrated offset, linearity, and full-scale accuracy. For the B-grade AD774BBRZ, unipolar offset is trimmed to ≤±2 LSB and full-scale error to ≤0.1% of FS. External trims (e.g., 50 Ω resistor between REF OUT and REF IN) are optional and only needed for applications demanding tighter than guaranteed specs.
Can AD774BBRZ operate with a single +5 V supply?
No, AD774BBRZ cannot operate with 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 dual analog supplies are essential for its internal comparator, DAC, and bipolar input operation. Attempting to run AD774BBRZ on only +5 V will result in non-functional analog circuitry and undefined output behavior.
Is AD774BBRZ pin-compatible with the AD574A?
Yes, AD774BBRZ is fully pin-compatible with the industry-standard AD574A in its 28-lead SOIC package. All signal names, pin numbers, and electrical timing relationships match. This allows direct replacement in existing AD574A-based designs, delivering faster 8 µs conversion, improved linearity (±1/2 LSB vs. ±1 LSB), and lower power-without any PCB layout changes or firmware modification.
What input voltage ranges does AD774BBRZ support?
The AD774BBRZ 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 made by hardware connection-10 VIN or 20 VIN is connected to the analog source, and BIP OFF (Pin 12) is tied to REF OUT for bipolar or AGND for unipolar. No external op amps or gain-setting resistors are required to configure these ranges.
AD774BBRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD774BBRZ FAQ
1.How can I place an order for AD774BBRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD774BBRZ 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 AD774BBRZ reliable?
The price and inventory of AD774BBRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD774BBRZ is usually 5 days.
3.What payment methods are accepted for AD774BBRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD774BBRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD774BBRZ?
AD774BBRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD774BBRZ 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 AD774BBRZ?
For technical support, including AD774BBRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD774BBRZ requirements.
6.How does Aetrix verify that AD774BBRZ is sourced from the original manufacturer or authorized distributors?
All AD774BBRZ 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 AD774BBRZ meets industry standards.
7.What is the process for return or replacement of AD774BBRZ?
All AD774BBRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD774BBRZ, 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 AD774BBRZ part is unused and in its original packaging.
Return procedure for AD774BBRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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