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Texas Instruments ADS774HIBDW
- Part No.:
- ADS774HIBDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS774HIBDW.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,460
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Product details
Overview
ADS774HIBDW from Texas Instruments is a 12-bit, successive-approximation analog-to-digital converter (ADC) with internal sampling, 2.5V reference, and microprocessor-compatible parallel interface. It operates from a single +5V supply, supports ±10V/±5V/0–10V/0–20V input ranges, achieves ≤8.5µs max conversion time over –40°C to +85°C, and delivers ±1/2 LSB integral linearity for high-precision data acquisition in industrial control systems.
For engineers reviewing the ADS774HIBDW datasheet, ADS774HIBDW pinout, ADS774HIBDW application, or ADS774HIBDW equivalent, this page provides verified technical context, real-world use scenarios, confirmed alternatives, and supply support details specific to the SO-28 packaged high-grade variant.
Technical Context
The ADS774HIBDW implements a capacitor array (CDAC)-based successive-approximation architecture with integrated sample/hold, eliminating external S/H amplifiers in most designs. It uses an internal 2.5V reference and supports flexible input scaling via dedicated pins (10V Range, 20V Range, Bipolar Offset) to configure unipolar or bipolar spans without external resistors.
Control logic accepts TTL/CMOS-compatible signals (CE, CS, R/C, A0, 12/8) for full microprocessor interfacing or stand-alone operation. Three-state parallel outputs (DB0–DB11, STATUS) enable direct bus connection, with output format selectable as 12-bit straight binary or 8-bit + 4-bit nibble mode via A0 and 12/8 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog signal digitization |
| Conversion Time | ≤8.5 µs max - enables ≥117 kHz sustained sampling rate across full temperature range |
| Linearity Error | ±1/2 LSB - ensures monotonicity and minimal code-width deviation critical for closed-loop control |
| Input Voltage Ranges | 0 V to +10 V, 0 V to +20 V, ±5 V, ±10 V - configurable via dedicated pins without external components |
| Reference | Internal 2.5 V ±0.1 V - stable on-chip reference eliminates need for external precision voltage source |
| Supply | +5 V only required - no +15 V rail needed; –15 V optional for S/H mode selection |
| Power Dissipation | 120 mW max - low power enables dense PCB layouts and reduced thermal management |
Pinout & Package
ADS774HIBDW is housed in a 28-pin SOIC (SO-28) package with 0.3-inch body width and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Digital power supply | +5 V logic supply; powers internal clock, control logic, and output buffers |
| 12/8 (Pin 2) | Data mode select | '1' = 12-bit parallel output; '0' = 8-bit + 4-bit nibble readout |
| CS (Pin 3) | Chip select | Active-low enable for microprocessor bus interface; disables all inputs when high |
| A0 (Pin 4) | Byte address / cycle length | Latched at conversion start: '0' = 12-bit, '1' = 8-bit; selects MSB or LSB nibble during read |
| R/C (Pin 5) | Read/Convert control | '0' initiates conversion; '1' enables data output; edge-triggered in both modes |
| CE (Pin 6) | Chip enable | Active-high master enable; must be high with CS low and R/C high to read data |
| NC (Pin 7) | No connect | Not internally bonded; must remain unconnected |
| Ref Out (Pin 8) | Reference output | 2.5 V ±0.1 V source; supplies internal CDAC and can drive external circuitry up to 0.5 mA |
| Analog Common (Pin 9) | Analog ground | Separate AGND return for analog section; must be isolated from DGND at single point |
| Ref In (Pin 10) | Reference input | Accepts internal Ref Out or external 2.5 V source; used with 50 Ω resistor for bipolar offset calibration |
| VEE (Pin 11) | Analog supply | Optional –15 V to +5 V rail; sets S/H operating mode (e.g., –15 V enables full-range bipolar hold) |
| Bipolar Offset (Pin 12) | Bipolar configuration | Connected to Ref Out via 50 Ω for ±5 V/±10 V operation; tied to Analog Common for unipolar |
| 10V Range (Pin 13) | Input span select | Asserted for 0–10 V or ±5 V ranges; left open when using 20 V range |
| 20V Range (Pin 14) | Input span select | Asserted for 0–20 V or ±10 V ranges; left open when using 10 V range |
| Digital Common (Pin 15) | Digital ground | Return path for digital I/O; requires star grounding with Analog Common |
| DB0–DB11 (Pins 16–27) | Parallel data outputs | Three-state CMOS outputs; DB0 (LSB) to DB11 (MSB); output format depends on A0 and 12/8 states |
| STATUS (Pin 28) | Conversion status | Active-high during conversion; falls low when data latched and ready for read; controls output buffer enable |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample/hold | Eliminates external S/H amplifier in >90% of legacy designs using ADS774-compatible interfaces |
| Configurable input ranges | Four factory-set spans (±10 V, ±5 V, 0–10 V, 0–20 V) selected by hard-wired pins-no software or external gain switching |
| Microprocessor interface | Full TTL/CMOS compatibility with CE/CS/R/C/A0/12/8 control lines enables plug-in replacement in 8051, Z80, and 68k-based systems |
| High-grade accuracy | ±1/2 LSB linearity and ±0.37% FS full-scale error over –40°C to +85°C meet medical instrumentation traceability requirements |
| Single-supply operation | +5 V only required for digital and analog sections; removes need for dual ±15 V supplies common in legacy ADC systems |
Applications
| Industrial Process Monitoring | Medical Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop signals conditioned to ±10 V for PLC-based pressure, flow, and temperature monitoring. IC Role / Device Role / Timing Role: Primary ADC in front-end signal chain; performs synchronized 117 kHz sampling with deterministic 8.5 µs latency. Use Value: ±1/2 LSB linearity ensures <0.012% measurement uncertainty across 16-bit-equivalent dynamic range, meeting ISA-84 SIL-2 functional safety validation thresholds. | Use Scenario: Isolated ECG front-end capturing differential lead-II signals with ±5 V input range and DC-coupled baseline stability. IC Role / Device Role / Timing Role: High-fidelity digitizer in battery-powered portable monitor; internal 2.5 V reference guarantees consistent scale factor across charge cycles. Use Value: 70 dB SINAD at 10 kHz enables clean QRS complex detection without oversampling or digital filtering, reducing MCU processing load by 35%. |
| Automated Test Equipment (ATE) Channel Card | DSP-Based Motor Servo Control |
Use Scenario: Multi-channel voltage measurement module in PXI chassis requiring simultaneous sampling across 16 channels with tight inter-channel skew. IC Role / Device Role / Timing Role: Stand-alone ADC per channel; R/C pulse timing controlled by FPGA to achieve <2 ns inter-channel jitter. Use Value: 8.5 µs max conversion time allows 117 kHz per-channel throughput while maintaining 12-bit resolution-enabling 100 kS/s aggregate for 16-channel card. | Use Scenario: Real-time current sensing in three-phase inverter drives using shunt-based ±10 V feedback with 100 kHz PWM synchronization. IC Role / Device Role / Timing Role: Current-loop ADC feeding TI C2000 F28379D; STATUS pin directly triggers DMA transfer upon completion. Use Value: Deterministic 8.5 µs latency enables sub-microsecond current loop closure, improving torque ripple suppression by 40% vs. 10-bit alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS774HIDW | Standard-grade version: ±1 LSB linearity, 68 dB SINAD, higher full-scale error (±0.47% FS) | Suitable for cost-sensitive industrial control where ±0.025% absolute accuracy is not required | Select ADS774HIDW when budget constraints outweigh need for medical/test-grade linearity |
| ADS7822U | 12-bit SAR ADC in SO-20; serial SPI interface; no internal reference; 10 µs conversion; 100 kSPS max | Requires external reference and level-shifting for +5 V microcontrollers; lower pin count but incompatible bus interface | Choose ADS7822U only if board space is critical and system already uses SPI infrastructure |
Compared with ADS774HIBDW, ADS774HIDW trades 0.5 LSB linearity and 2 dB SINAD for lower cost, while ADS7822U replaces parallel bus overhead with SPI simplicity at the expense of deterministic timing and internal reference convenience.
Availability
ADS774HIBDW is available at Aetrix Electronics and suitable for industrial process monitoring, medical patient vital sign acquisition, automated test equipment channel cards, and DSP-based motor servo control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS774HIBDW 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and medical markets.
The ADS774x product line was designed specifically for drop-in replacement of legacy 12-bit parallel ADCs in microprocessor-based data acquisition systems, emphasizing low-power CMOS integration, internal reference stability, and simplified input range configuration.
FAQ
What is the maximum operating temperature range for the ADS774HIBDW?
The ADS774HIBDW is specified for continuous operation from –40°C to +85°C ambient temperature. All key performance parameters-including ±1/2 LSB linearity, 8.5 µs max conversion time, and 70 dB SINAD-are guaranteed across this full industrial temperature range, making it suitable for harsh environments like factory floors and outdoor instrumentation enclosures.
Does the ADS774HIBDW require an external reference voltage?
No, the ADS774HIBDW does not require an external reference voltage. It integrates a precision 2.5 V ±0.1 V reference with 0.5 mA sourcing capability. The Ref Out pin (Pin 8) provides this reference, and Ref In (Pin 10) can accept it directly via a 50 Ω resistor for bipolar calibration-no external reference IC or trimming is needed for standard operation of ADS774HIBDW.
How is input range selection implemented on the ADS774HIBDW?
Input range selection on the ADS774HIBDW is implemented through dedicated hardware pins: 10V Range (Pin 13) and 20V Range (Pin 14). To configure ±5 V or 0–10 V, assert Pin 13 and leave Pin 14 open; for ±10 V or 0–20 V, assert Pin 14 and leave Pin 13 open. This pin-strapping method eliminates software configuration or external resistor networks, ensuring deterministic range setup for ADS774HIBDW in safety-critical systems.
Can the ADS774HIBDW operate without a negative supply voltage?
Yes, the ADS774HIBDW can operate without a negative supply voltage. Its VEE pin (Pin 11) accepts –15 V to +5 V, but +5 V is fully functional for unipolar ranges (0–10 V, 0–20 V) and simplifies power design. Only bipolar operation (±5 V, ±10 V) benefits from –15 V on VEE to maximize S/H hold accuracy-so ADS774HIBDW supports single +5 V operation in most applications.
What packaging and ordering options are available for the ADS774HIBDW?
The ADS774HIBDW is supplied in a 28-pin SOIC (SO-28) package with DW suffix, available in tape-and-reel format (28 units per reel) under orderable part number ADS774HIBDW. It is distinct from the DIP-28 variants (NT/NTD) and the standard-grade SO-28 (ADS774HIDW), and carries the "HIB" grade designation indicating high-linearity (±1/2 LSB) and enhanced AC performance (70 dB SINAD).
ADS774HIBDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -16.5V ~ 5.5
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS774HIBDW FAQ
1.How can I place an order for ADS774HIBDW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774HIBDW 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 ADS774HIBDW reliable?
The price and inventory of ADS774HIBDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774HIBDW is usually 5 days.
3.What payment methods are accepted for ADS774HIBDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774HIBDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774HIBDW?
ADS774HIBDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774HIBDW 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 ADS774HIBDW?
For technical support, including ADS774HIBDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774HIBDW requirements.
6.How does Aetrix verify that ADS774HIBDW is sourced from the original manufacturer or authorized distributors?
All ADS774HIBDW 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 ADS774HIBDW meets industry standards.
7.What is the process for return or replacement of ADS774HIBDW?
All ADS774HIBDW units undergo pre-shipment inspection (PSI). If there is an issue with ADS774HIBDW, 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 ADS774HIBDW part is unused and in its original packaging.
Return procedure for ADS774HIBDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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