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Texas Instruments ADS774HIDW
- Part No.:
- ADS774HIDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS774HIDW.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,059
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Product details
Overview
ADS774HIDW from Texas Instruments is a 12-bit, successive-approximation analog-to-digital converter (ADC) with integrated CDAC, internal 2.5V reference, microprocessor interface, and three-state parallel outputs. It operates from a single +5V supply (–15V optional), supports ±10V/±5V/0V–+10V/0V–+20V input ranges, and achieves ≤8.5µs max conversion time over –40°C to +85°C. It replaces the ADS774 with lower power (120mW max) and eliminates external sample/hold in medical instrumentation and industrial control systems.
For engineers reviewing the ADS774HIDW datasheet, ADS774HIDW pinout, ADS774HIDW application, or ADS774HIDW equivalent, key selection criteria include its 12-bit resolution with ±1 LSB linearity error, SO-28 package compatibility, 117kHz sampling rate, unipolar/bipolar offset binary output coding, and support for both stand-alone (R/C-controlled) and fully microprocessor-controlled operation modes.
Technical Context
The ADS774HIDW implements a charge-redistribution successive-approximation architecture using a capacitor DAC (CDAC) array, enabling fast acquisition and conversion without external sample/hold circuitry. Its internal 2.5V reference drives REF OUT and is used for scaling across multiple input voltage ranges via dedicated pins (10V Range, 20V Range, Bipolar Offset).
Control logic accepts TTL/CMOS-compatible inputs (CE, CS, R/C, A0, 12/8) to configure 8- or 12-bit conversions, byte-addressed read cycles, and output enable timing. STATUS pin provides real-time conversion progress indication, while DB0–DB11 deliver parallel data in straight binary (unipolar) or offset binary (bipolar) format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization |
| Conversion Time | ≤8.5 µs max - enables ≥117 kHz sustained sampling rate over full temperature range |
| Input Ranges | ±10V, ±5V, 0V–+10V, 0V–+20V - selectable via dedicated pins without external resistors |
| Linearity Error | ±1 LSB (standard grade) - ensures monotonicity and predictable code transitions |
| Reference Voltage | 2.5 V ±0.1 V - internally generated, stable output usable as system reference |
| Power Dissipation | 120 mW max at TA = –40°C to +85°C - enables low-thermal-impact integration in dense PCB layouts |
| Supply Voltage | +5 V only required; –15 V optional - simplifies power design versus dual-supply ADCs |
Pinout & Package
ADS774HIDW is housed in a 28-pin SOIC (SO-28) package with 0.3-inch width and standard JEDEC MS-012AC footprint. Pin spacing is 0.05 inch (1.27 mm), compatible with automated assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1) | Digital supply | +5 V logic rail; powers internal logic, clock, and output buffers |
| 12/8 (2) | Data mode select | '1' = 12-bit parallel output enabled; '0' = byte-mode (MSB/LSB) output |
| CS (3) | Chip select | Active-low enable for microprocessor bus interface; must be low during CE/R/C activity |
| A0 (4) | Byte address | Latched at conversion start: '0' = 12-bit cycle; '1' = 8-bit cycle or LSB byte read |
| R/C (5) | Read/Convert control | '0' = initiate conversion; '1' = enable data output after completion |
| CE (6) | Chip enable | Active-high master enable; required high for any operation including R/C-triggered mode |
| NC (7) | No connect | Not internally bonded; must remain unconnected per datasheet |
| Ref Out (8) | Reference output | 2.5 V ±0.1 V source; supplies internal scaling and may drive external circuitry up to 0.5 mA |
| Analog Common (9) | Analog ground | Separate AGND return path; must be isolated from Digital Common to minimize noise coupling |
| Ref In (10) | Reference input | Accepts 2.5 V reference; tied to Ref Out via 50 Ω for bipolar calibration |
| VEE (11) | Analog supply | Optional –15 V to +5 V rail; sets S/H mode (–15 V = full hold; +5 V = control mode) |
| Bipolar Offset (12) | Bipolar configuration | Connected to Ref Out via 50 Ω for ±10V/±5V operation; tied to Analog Common for unipolar |
| 10V Range (13) | Input span select | Asserted for 0V–+10V or ±5V ranges; left open when 20V Range is active |
| 20V Range (14) | Input span select | Asserted for 0V–+20V or ±10V ranges; left open when 10V Range is active |
| Digital Common (15) | Digital ground | Separate DGND return; requires star-point connection to Analog Common at single point |
| DB0–DB11 (16–27) | Parallel data output | Three-state outputs delivering 12-bit result in USB (unipolar) or BOB (bipolar) format |
| STATUS (28) | Conversion status | Active-high during conversion; falls low when data latched and ready for read |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CDAC architecture | Eliminates need for external sample/hold amplifier in most applications, reducing BOM count and layout area |
| Multiple programmable input ranges | Hardware-selectable ±10V, ±5V, 0V–+10V, 0V–+20V spans via dedicated pins-no external gain/attenuation required |
| Microprocessor-compatible interface | Full TTL/CMOS-level control (CE, CS, R/C, A0, 12/8) supports direct 8051, Z80, and 68k bus integration |
| Internal 2.5V reference | Stable ±0.1 V output with 0.5 mA sourcing capability-reduces external component count and improves system accuracy |
| Three-state parallel outputs | DB0–DB11 tri-state buffers allow direct connection to shared data buses without external transceivers |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: High-precision ECG and patient monitor front-ends digitizing low-amplitude bio-signals with wide dynamic range. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs with ±10V input range and 12-bit resolution for waveform fidelity. Use Value: Internal 2.5V reference and bipolar offset binary coding ensure accurate zero-crossing detection and baseline stability in differential measurements. | Use Scenario: Modular rack-mounted DAQ modules acquiring multi-channel industrial sensor data (pressure, temperature, flow) at ≥100 kSPS. IC Role / Device Role / Timing Role: Stand-alone ADC controlled via R/C line, delivering synchronized 12-bit samples to FPGA-based data aggregation logic. Use Value: ≤8.5 µs conversion time enables deterministic sampling intervals and tight jitter control across 16+ channels. |
| Industrial Control | Test Equipment |
Use Scenario: PLC analog I/O modules converting field signals (4–20 mA, ±10 V) into digital control values for closed-loop servo positioning. IC Role / Device Role / Timing Role: ADC interfacing directly to isolation amplifiers and microcontroller peripherals in harsh EMI environments. Use Value: Separate Analog/Digital Common pins and ±1 LSB linearity maintain measurement integrity despite ground potential differences. | Use Scenario: Automated test equipment digitizing DUT outputs across multiple voltage ranges (±5 V for op-amp testing, 0–20 V for power supply validation). IC Role / Device Role / Timing Role: Reconfigurable ADC supporting rapid range switching via 10V/20V Range pins without firmware reload. Use Value: Hardware-selectable input spans reduce test sequence overhead and eliminate external relay-based range switching. |
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 time | Lower resolution, serial interface, higher speed - suited for space-constrained embedded control | Select when board space is critical and 8-bit resolution suffices; not drop-in due to interface and pinout mismatch |
| MAX197ACPI+ | 12-bit, 8-channel MUX, internal 4.096V reference, parallel/SPI, 10 µs conversion | Integrated multiplexer and higher reference voltage - ideal for multi-sensor scanning systems | Choose when channel scanning and on-chip MUX reduce external component count; requires different power and timing design |
Compared with ADS774HIDW, ADS7822U trades resolution and parallel interface for compactness and speed, while MAX197ACPI+ adds channel multiplexing and a higher reference at the cost of longer conversion latency and different pinout - neither offers pin compatibility, but both serve overlapping industrial data acquisition use cases.
Availability
ADS774HIDW is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS774HIDW 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 decades of expertise in precision data converters and industrial-grade ICs.
The ADS774H series belongs to TI's legacy high-speed parallel-output ADC product line, designed specifically for microprocessor-based data acquisition systems needing fast, self-contained conversion with minimal external components.
FAQ
What is the maximum operating temperature range for the ADS774HIDW?
The ADS774HIDW 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 SINAD (68 dB)-are guaranteed across this full industrial temperature range, making ADS774HIDW suitable for deployment in demanding environments such as factory automation and outdoor instrumentation.
Does the ADS774HIDW require an external reference voltage?
No, the ADS774HIDW does not require an external reference voltage. It integrates a precision 2.5 V ±0.1 V reference that drives both internal scaling circuitry and the REF OUT pin. This reference can supply up to 0.5 mA to external circuitry, eliminating the need for a separate reference IC in most designs using ADS774HIDW.
How does the ADS774HIDW handle bipolar versus unipolar input configurations?
The ADS774HIDW supports both configurations via hardware pins: for bipolar (±5V or ±10V), connect Bipolar Offset to REF OUT through a 50 Ω resistor; for unipolar (0V–+10V or 0V–+20V), tie Bipolar Offset to Analog Common. Input range is selected by asserting either 10V Range or 20V Range, and output coding automatically switches between bipolar offset binary (BOB) and unipolar straight binary (USB) based on configuration-no software reconfiguration needed in ADS774HIDW.
Can the ADS774HIDW operate without the –15V supply?
Yes, the ADS774HIDW can operate without the –15V supply. VEE is optional and supports three modes: –15V enables full sample/hold functionality; 0V or +5V configures alternative S/H control modes. The device functions correctly with only +5V applied to VDD and all other supplies referenced to their respective commons. ADS774HIDW's datasheet confirms single +5V operation is fully supported.
What packaging and ordering options are available for the ADS774HIDW?
The ADS774HIDW is supplied in a 28-pin SOIC (SO-28) package with 0.3-inch width, designated by the DW suffix. Ordering options include ADS774HIDW (tape-and-reel, 28 units) and ADS774HIDWR (tape-and-reel, 1000 units). Both variants share identical electrical specifications, temperature rating (–40°C to +85°C), and SO-28 mechanical dimensions-ADS774HIDW is the standard production version for prototyping and low-volume builds.
ADS774HIDW 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:
- -
ADS774HIDW FAQ
1.How can I place an order for ADS774HIDW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774HIDW 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 ADS774HIDW reliable?
The price and inventory of ADS774HIDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774HIDW is usually 5 days.
3.What payment methods are accepted for ADS774HIDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774HIDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774HIDW?
ADS774HIDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774HIDW 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 ADS774HIDW?
For technical support, including ADS774HIDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774HIDW requirements.
6.How does Aetrix verify that ADS774HIDW is sourced from the original manufacturer or authorized distributors?
All ADS774HIDW 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 ADS774HIDW meets industry standards.
7.What is the process for return or replacement of ADS774HIDW?
All ADS774HIDW units undergo pre-shipment inspection (PSI). If there is an issue with ADS774HIDW, 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 ADS774HIDW part is unused and in its original packaging.
Return procedure for ADS774HIDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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