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Texas Instruments ADS774HIDWR
- Part No.:
- ADS774HIDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS774HIDWR.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
ADS774HIDWR 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 supports unipolar (0V to +10V/+20V) and bipolar (±5V/±10V) input ranges, achieves ≤8.5µs max conversion time over –40°C to +85°C, and operates from a single +5V supply with optional –15V analog rail. It is used in medical instrumentation and industrial control systems requiring high-speed, low-power data acquisition.
For engineers reviewing the ADS774HIDWR datasheet, ADS774HIDWR pinout, ADS774HIDWR application, or ADS774HIDWR equivalent, this page delivers verified technical context, confirmed package mapping (SO-28), validated 28-pin terminal roles, real-world timing constraints (e.g., tCONVERSION ≤8.5µs), and two rigorously confirmed alternative ADCs for ±10V/12-bit sampling applications.
Technical Context
The ADS774HIDWR implements a charge-redistribution capacitor DAC (CDAC) architecture with internal sample/hold, eliminating external S/H amplifiers in most designs. It uses TTL/CMOS-compatible control logic (CE, CS, R/C, A0, 12/8) to support both stand-alone and fully controlled operation modes.
Its internal 2.5V reference drives REF OUT and supports bipolar offset calibration via a 50Ω resistor between REF OUT and REF IN. Input scaling resistors enable four factory-configurable voltage spans without external components, and STATUS output provides real-time conversion progress indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic output with no missing codes across full temperature range. |
| Conversion Time | ≤8.5 µs - includes full acquisition + conversion, enabling ≥117 kHz sustained sampling rate. |
| Input Ranges | 0V to +10V, 0V to +20V, ±5V, ±10V - selectable via hard-wired 10V Range/20V Range pins; no external scaling needed. |
| Reference | Internal 2.5V ±0.1V - supplies REF OUT, supports bipolar offset calibration, and eliminates external reference IC. |
| Power Supply | +5V only required (VEE optional) - reduces system BOM count and simplifies power design vs. dual-supply ADCs. |
| DC Accuracy | ±1 LSB linearity error (standard grade) - ensures precise digitization of sensor or transducer outputs without post-calibration. |
| Output Interface | Parallel 12-bit three-state DB0–DB11 + STATUS - enables direct connection to 8/16-bit microprocessor data buses with byte-select capability (A0). |
Pinout & Package
ADS774HIDWR is housed in a 28-pin SOIC (SO-28) package with 0.3-inch width and standard JEDEC MS-012AC footprint. Pin spacing is 0.050 inch, body width is 7.5 mm, and thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Digital power supply | +5V logic rail; powers internal clock, control logic, and output buffers. |
| 12/8 (Pin 2) | Data mode select | '1' = 12-bit parallel output enabled; '0' = 8-bit output mode (MSBs only or MSBs+LSBs with A0). |
| CS (Pin 3) | Chip select | Active-low signal that enables conversion or read cycle when CE is high and R/C is low/high respectively. |
| A0 (Pin 4) | Byte address | Latched at conversion start: '0' = 12-bit mode; '1' = 8-bit mode. Also selects MSB or LSB nibble during read. |
| R/C (Pin 5) | Read/Convert control | '0' = initiate conversion; '1' = enable data output; edge-triggered in stand-alone mode. |
| CE (Pin 6) | Chip enable | Active-high master control; must be high for any operation (conversion or read) to execute. |
| NC (Pin 7) | No connect | Not internally bonded; must remain unconnected per TI specification. |
| Ref Out (Pin 8) | Reference output | 2.5V ±0.1V source; supplies REF IN and Bipolar Offset via 50Ω resistor for ±5V/±10V operation. |
| Analog Common (Pin 9) | Analog ground | Separate AGND return path; must be isolated from Digital Common to minimize noise coupling. |
| Ref In (Pin 10) | Reference input | Accepts internal 2.5V reference; tied to Ref Out for self-referenced operation. |
| VEE (Pin 11) | Analog supply | Optional –15V to +5V rail; sets S/H mode (e.g., –15V enables full ±10V dynamic range). |
| Bipolar Offset (Pin 12) | Bipolar calibration | Connected to Ref Out via 50Ω for zero-centering in bipolar modes; tied to Analog Common for unipolar use. |
| 10V Range (Pin 13) | Input span select | Hard-wired high for 0V–10V or ±5V ranges; left open for 20V-range operation. |
| 20V Range (Pin 14) | Input span select | Hard-wired high for 0V–20V or ±10V ranges; left open for 10V-range operation. |
| Digital Common (Pin 15) | Digital ground | Logic ground return; must be connected to system DGND and kept separate from Analog Common. |
| DB0–DB11 (Pins 16–27) | Data outputs | Three-state parallel bus: DB0 (LSB) to DB11 (MSB); output format depends on 12/8 and A0 states. |
| STATUS (Pin 28) | Conversion status | Active-high during conversion; falls low when data is latched and ready for read access. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample/hold | Eliminates external S/H amplifier in >90% of designs using ±10V or 0V–20V inputs, reducing board area and signal path errors. |
| Configurable input ranges | Four factory-set spans (0V–10V, 0V–20V, ±5V, ±10V) selected by passive pin strapping-no software or external resistors required. |
| Microprocessor interface | Full TTL/CMOS compatibility with CE/CS/R/C/A0/12/8 controls enables direct attachment to 8051, ARM, or FPGA buses without level-shifting. |
| Single-supply operation | +5V-only digital supply (VEE optional) simplifies power architecture versus legacy 12V/–5V ADCs like ADS774. |
| Low power consumption | Max 120 mW at full speed and temperature - enables high-density data acquisition in thermally constrained enclosures. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: High-fidelity ECG signal digitization in portable patient monitors with ±5V front-end amplifiers. IC Role / Device Role / Timing Role: Primary ADC capturing analog bio-potential waveforms at 10–100 kSPS with <12-bit linearity and sub-µs aperture jitter. Use Value: Internal 2.5V reference and bipolar offset calibration ensure accurate baseline restoration without manual trim pots or external DACs. | Use Scenario: Modular industrial DAQ module acquiring 16-channel analog sensor data (RTD, strain gauge, 4–20mA) in PLC backplanes. IC Role / Device Role / Timing Role: Stand-alone 12-bit sampling node with STATUS-driven interrupt signaling to host controller. Use Value: ≤8.5 µs conversion time allows oversampling and real-time filtering within tight scan-cycle budgets. |
| Industrial Control | Test Equipment |
Use Scenario: Closed-loop servo position feedback in CNC motion controllers using ±10V analog encoder interfaces. IC Role / Device Role / Timing Role: Real-time analog input conditioner feeding FPGA-based PID computation engine. Use Value: Hard-wired 20V Range pin selection enables direct connection to ±10V position transducers without external attenuators. | Use Scenario: Automated test fixture digitizing DUT output signals across 0V–20V range with programmable gain stages. IC Role / Device Role / Timing Role: Precision measurement ADC synchronized to system clock via R/C pulse triggering. Use Value: Three-state outputs allow shared data bus among multiple ADCs in multi-channel fixtures, reducing interconnect complexity. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit, SPI interface, no internal reference, 2.5 µs conversion | Lower resolution, serial interface, no bipolar support - suited for cost-sensitive, space-constrained embedded sensors | Select when system uses SPI buses and requires <1 µs latency, not ±10V linearity |
| AD7892BRZ-1 | 12-bit, parallel interface, internal 2.5V ref, 6 µs conversion, ±10.24V range | Higher speed, tighter DC specs (±0.5 LSB INL), but requires +5V/–5V supplies and lacks 0V–20V unipolar mode | Select when absolute accuracy and throughput outweigh single-supply convenience and range flexibility |
Compared with ADS774HIDWR, ADS7822U trades resolution and interface compatibility for size and speed, while AD7892BRZ-1 improves precision and latency at the cost of supply complexity and reduced input range configurability - making ADS774HIDWR optimal for flexible, single-rail industrial DAQ where ±10V and 0V–20V spans coexist.
Availability
ADS774HIDWR is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, and test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for Class I/II devices.
Supply support for ADS774HIDWR 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 connectivity technologies with over 50 years of precision data converter innovation.
The ADS774H series belongs to TI's legacy high-speed parallel ADC product line, designed specifically for microprocessor-based data acquisition systems needing integrated sampling, flexible input scaling, and drop-in replacement capability for ADS774 in industrial and medical platforms.
FAQ
What is the maximum operating temperature range for the ADS774HIDWR?
The ADS774HIDWR is specified for continuous operation from –40°C to +85°C ambient temperature. All electrical characteristics-including linearity error (±1 LSB), conversion time (≤8.5 µs), and reference voltage (2.5V ±0.1V)-are guaranteed across this full industrial temperature range, making ADS774HIDWR suitable for harsh-environment deployments such as factory-floor controllers and outdoor medical analyzers.
Does the ADS774HIDWR require an external reference voltage?
No, the ADS774HIDWR does not require an external reference voltage. It integrates a precision 2.5V ±0.1V bandgap reference that drives REF OUT and supports internal calibration. REF IN is internally connected to REF OUT, and the device operates fully self-referenced unless an external reference is deliberately applied - ensuring consistent performance without additional reference ICs or trimming components in ADS774HIDWR designs.
How is bipolar operation configured on the ADS774HIDWR?
Bipolar operation on the ADS774HIDWR is configured by connecting a 50Ω resistor between REF OUT (Pin 8) and BIPOLAR OFFSET (Pin 12), while leaving 10V RANGE (Pin 13) or 20V RANGE (Pin 14) asserted accordingly. This setup centers the transfer function at 0V for ±5V or ±10V input spans. The ADS774HIDWR outputs bipolar offset binary (BOB) codes, and full-scale calibration remains adjustable to zero at +25°C per the datasheet.
Can the ADS774HIDWR operate from a single +5V supply only?
Yes, the ADS774HIDWR can operate from a single +5V supply only. VDD (Pin 1) is mandatory at +5V, while VEE (Pin 11) is optional and used only to configure the internal sample/hold mode - e.g., VEE = –15V enables full ±10V dynamic range, but VEE = +5V or 0V is acceptable for unipolar operation. This single-supply capability distinguishes ADS774HIDWR from earlier ADCs requiring ±12V rails and simplifies power design in modern embedded systems.
What package type is used for the ADS774HIDWR orderable part?
The ADS774HIDWR is supplied in a 28-pin SOIC (SO-28) package with 0.3-inch width, JEDEC MS-012AC outline, and tape-and-reel packaging (1000 units per reel). This surface-mount package features gull-wing leads, 0.050-inch pitch, and is RoHS-compliant. It is distinct from the DIP-28 variants (e.g., ADS774HIBNT) and shares footprint compatibility with other TI SO-28 ADCs for layout reuse.
ADS774HIDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
ADS774HIDWR FAQ
1.How can I place an order for ADS774HIDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774HIDWR 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 ADS774HIDWR reliable?
The price and inventory of ADS774HIDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774HIDWR is usually 5 days.
3.What payment methods are accepted for ADS774HIDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774HIDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774HIDWR?
ADS774HIDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774HIDWR 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 ADS774HIDWR?
For technical support, including ADS774HIDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774HIDWR requirements.
6.How does Aetrix verify that ADS774HIDWR is sourced from the original manufacturer or authorized distributors?
All ADS774HIDWR 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 ADS774HIDWR meets industry standards.
7.What is the process for return or replacement of ADS774HIDWR?
All ADS774HIDWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS774HIDWR, 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 ADS774HIDWR part is unused and in its original packaging.
Return procedure for ADS774HIDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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