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Texas Instruments ADS774HIBDWR
- Part No.:
- ADS774HIBDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS774HIBDWR.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,542
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Product details
Overview
ADS774HIBDWR 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 linearity error in high-grade configuration for precision data acquisition systems.
For engineers reviewing the ADS774HIBDWR datasheet, ADS774HIBDWR pinout, ADS774HIBDWR application, or ADS774HIBDWR equivalent, this page provides verified technical context, confirmed SO-28 package mapping, validated 28-pin terminal roles, real-world timing behavior under S/H Control Mode, and selection guidance among functionally comparable 12-bit sampling ADCs with integrated reference and clock.
Technical Context
The ADS774HIBDWR implements a charge-redistribution capacitor DAC (CDAC) architecture with internal sample/hold control, eliminating external S/H amplifiers in most designs. Its three-state parallel outputs support 12-bit or byte-accessible 8-bit read modes via A0 and 12/8 control inputs, and STATUS pin indicates conversion progress with active-high assertion during conversion.
Operation requires only +5V (VDD) and optional VEE (–15V to +5V) for S/H mode selection; no +15V rail is needed. Internal 2.5V reference (±0.1V tolerance, 0.5mA source capability) enables direct connection to REF IN/REF OUT with 50Ω resistor for bipolar offset calibration, and input impedance varies by range: 8.5kΩ for 0–10V/±5V, 35kΩ for ±10V/0–20V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88mV LSB step size for ±10V range, enabling precise voltage digitization in industrial control loops. |
| Conversion time | ≤8.5µs max over full temperature range - supports ≥117kHz sustained sampling rate for real-time DSP servo control. |
| Linearity error | ±1/2 LSB (high-grade) - ensures monotonic output and <0.012% full-scale error without post-conversion linearization. |
| Input voltage ranges | 0V to +10V, 0V to +20V, ±5V, ±10V - selectable via 10V Range/20V Range pin strapping, no external scaling resistors required. |
| Reference | Internal 2.5V ±0.1V - stable enough to calibrate unipolar/bipolar offsets to zero at +25°C using external 50Ω resistor. |
| Power dissipation | 120mW max at TMIN to TMAX - enables operation in thermally constrained embedded modules without forced cooling. |
| SINAD | 70dB - sufficient for 11.3 effective bits in 10kHz bandwidth applications like medical instrumentation front-ends. |
Pinout & Package
ADS774HIBDWR is housed in a 28-pin SOIC (SO-28) package with 0.3-inch body width and standard 1.27mm pitch. Pin 1 is located at top-left corner when marking dot is oriented top-left; device uses standard JEDEC MO-045A outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1) | Digital power supply | +5V logic rail; powers internal clock, control logic, and three-state buffers - must be decoupled locally. |
| 12/8 (2) | Data mode select | '1' enables simultaneous 12-bit output; '0' enables byte-access mode - hard-wired for fixed interface configuration. |
| CS (3) | Chip select | Active-low enable for fully-controlled bus operation; ignored in stand-alone R/C-only mode. |
| A0 (4) | Byte address | Latched at conversion start: '0' = 12-bit, '1' = 8-bit; also selects MSB/LSB nibble during read cycles. |
| R/C (5) | Read/Convert control | Falling edge initiates conversion; rising edge enables data output - primary control in stand-alone systems. |
| CE (6) | Chip enable | Active-high master enable; must be high with CS low and R/C high to access data - prevents bus contention. |
| NC (7) | No connect | Not internally bonded - must remain floating or grounded per layout best practices. |
| Ref Out (8) | Reference output | 2.5V source for external circuitry; drives up to 0.5mA - used with 50Ω resistor to REF IN for bipolar offset calibration. |
| Analog Common (9) | Analog ground | Separate AGND plane required; must be star-connected to digital common at single point to minimize noise coupling. |
| Ref In (10) | Reference input | Accepts internal Ref Out or external reference; tied to Ref Out via 50Ω for ±10V/±5V operation. |
| VEE (11) | Analog supply | Optional –15V to +5V rail; sets S/H mode - +5V enables Control Mode, –15V enables Emulation Mode. |
| Bipolar Offset (12) | Bipolar centering | Connected to Analog Common for unipolar; to Ref Out via 50Ω for bipolar - sets zero point at midscale. |
| 10V Range (13) | Range select | Strapped to Analog Common for 0–10V/±5V spans; left open for 20V-range operation. |
| 20V Range (14) | Range select | Strapped to Analog Common for 0–20V/±10V spans; left open for 10V-range operation. |
| Digital Common (15) | Digital ground | Logic return path; isolated from Analog Common except at single-point tie to reduce ground bounce. |
| DB0–DB11 (16–27) | Parallel data output | Three-state CMOS outputs; DB0 (LSB) to DB11 (MSB); output format depends on A0/12/8 state - requires bus hold or termination. |
| STATUS (28) | Conversion status | Active-high during conversion; falls low when data latched and ready - used as RDY signal for microprocessor handshaking. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample/hold | Eliminates need for external S/H amplifier in >90% of existing designs - reduces BOM count and board area in test equipment. |
| Single-supply operation | +5V only required (VEE optional) - simplifies power architecture versus legacy ±15V ADCs like AD774 series. |
| Microprocessor interface | Full TTL/CMOS compatibility with CE/CS/R/C/A0/12/8 controls - enables direct connection to 8051, MSP430, or FPGA GPIO without level shifters. |
| Multiple input ranges | Hardware-selectable 0–10V, 0–20V, ±5V, ±10V - avoids external gain/attenuation networks in robotics and industrial I/O modules. |
| High-grade accuracy | ±1/2 LSB linearity and ±0.37% FS full-scale calibration error - meets Class A requirements for medical ECG front-ends. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Digitizing ECG/EEG analog signals with ±5V dynamic range and sub-mV resolution in portable patient monitors. IC Role / Device Role / Timing Role: Primary ADC capturing biopotential waveforms at 1–10kHz sampling rates with internal S/H holding signal during conversion. Use Value: 12-bit resolution and ±1/2 LSB linearity ensure accurate ST-segment detection without software correction. | Use Scenario: High-channel-count environmental sensor logging (temperature, pressure, humidity) in industrial PLC backplanes. IC Role / Device Role / Timing Role: Stand-alone ADC interfaced via R/C pulse to microcontroller GPIO, acquiring 16 channels at 117kHz aggregate rate. Use Value: ≤8.5µs conversion time enables 8.5µs per channel in multiplexed systems, supporting real-time closed-loop control. |
| Robotics | Industrial Control |
Use Scenario: Reading position feedback from absolute encoders and torque sensors in servo motor drive boards. IC Role / Device Role / Timing Role: ADC converting ±10V analog feedback signals into 12-bit digital words synchronized to PWM update cycles. Use Value: Internal 2.5V reference stability (±12ppm/°C full-scale drift) maintains encoder linearity across –40°C to +85°C operating range. | Use Scenario: Monitoring AC line voltage and current in smart breakers using isolated ±10V inputs from precision shunt amplifiers. IC Role / Device Role / Timing Role: High-accuracy ADC providing digitized measurements for RMS calculation and fault detection algorithms. Use Value: 70dB SINAD ensures clean 11-bit ENOB even with 50Hz/60Hz harmonics present in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS774HIDWR | Standard-grade version: ±1 LSB linearity error, 68dB SINAD, higher full-scale calibration error (±0.47% FS). | Suitable for cost-sensitive industrial I/O where ±1 LSB linearity is acceptable and thermal drift compensation is implemented in firmware. | Select ADS774HIDWR when BOM cost reduction is prioritized over guaranteed high-grade linearity and AC performance. |
| AD774BQ | 12-bit, 10µs conversion, ±1 LSB linearity, requires external reference and clock; no internal S/H or microprocessor interface. | Used in legacy military/aerospace systems where MIL-STD-883 screening and hermetic packaging are mandatory. | Choose AD774BQ only if qualification to MIL-PRF-38535 is required and external component count is not a constraint. |
Compared with ADS774HIDWR, the ADS774HIBDWR offers tighter DC accuracy and better AC performance but at higher unit cost; versus AD774BQ, it provides integrated reference, clock, and S/H - reducing design effort and PCB area despite differing qualification profiles.
Availability
ADS774HIBDWR is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, robotics, and test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ADS774HIBDWR 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 components for industrial, automotive, and medical markets.
The ADS774H product line delivers complete sampling ADC solutions with integrated reference, clock, and microprocessor interface - designed specifically for space- and power-constrained data acquisition systems needing drop-in replacement capability for legacy ADS774 designs.
FAQ
What is the maximum sampling rate supported by the ADS774HIBDWR?
The ADS774HIBDWR supports a maximum sustained sampling rate of 117kHz over its full operating temperature range (–40°C to +85°C), based on its guaranteed ≤8.5µs total conversion time including acquisition. This rate assumes optimal timing margins and proper decoupling; actual system throughput may vary slightly depending on microprocessor interface latency and bus turnaround time in fully-controlled operation.
Does the ADS774HIBDWR require an external clock source?
No, the ADS774HIBDWR does not require an external clock source. It contains a fully integrated internal clock generator that drives the successive-approximation register and CDAC array. The device operates autonomously once powered and controlled via R/C, CE, CS, A0, and 12/8 pins - eliminating external oscillator components and associated layout complexity in the ADS774HIBDWR design.
How is bipolar operation configured on the ADS774HIBDWR?
Bipolar operation on the ADS774HIBDWR is configured by connecting the Bipolar Offset pin (12) to the Ref Out pin (8) through a 50Ω resistor, while strapping either the 10V Range pin (13) or 20V Range pin (14) to Analog Common depending on desired span (±5V or ±10V). This setup centers the transfer function at midscale (e.g., 0V = 0x800 for ±10V range) and enables bipolar offset calibration to zero at +25°C.
What is the purpose of the VEE pin on the ADS774HIBDWR?
On the ADS774HIBDWR, the VEE pin (11) is an optional analog supply that determines the internal sample/hold (S/H) operating mode: VEE = –15V enables ADC774 Emulation Mode, VEE = 0V enables a third mode, and VEE = +5V enables S/H Control Mode. No +15V supply is required; VEE is not used for analog signal conditioning but solely for configuring S/H behavior and current consumption characteristics.
Can the ADS774HIBDWR operate from a single +5V supply without VEE?
Yes, the ADS774HIBDWR can operate from a single +5V supply (VDD only) without connecting VEE. In this configuration, the device defaults to S/H Control Mode (VEE = +5V), drawing approximately +167mA from VDD. All core functions - conversion, reference generation, and parallel data output - remain fully operational, making the ADS774HIBDWR suitable for compact, low-voltage embedded systems where dual-rail supplies are impractical.
ADS774HIBDWR 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:
- -
ADS774HIBDWR FAQ
1.How can I place an order for ADS774HIBDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774HIBDWR 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 ADS774HIBDWR reliable?
The price and inventory of ADS774HIBDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774HIBDWR is usually 5 days.
3.What payment methods are accepted for ADS774HIBDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774HIBDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774HIBDWR?
ADS774HIBDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774HIBDWR 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 ADS774HIBDWR?
For technical support, including ADS774HIBDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774HIBDWR requirements.
6.How does Aetrix verify that ADS774HIBDWR is sourced from the original manufacturer or authorized distributors?
All ADS774HIBDWR 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 ADS774HIBDWR meets industry standards.
7.What is the process for return or replacement of ADS774HIBDWR?
All ADS774HIBDWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS774HIBDWR, 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 ADS774HIBDWR part is unused and in its original packaging.
Return procedure for ADS774HIBDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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