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Texas Instruments ADS774KP-4
- Part No.:
- ADS774KP-4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
ADS774KP-4.pdf
- Description:
- ADC, SUCCESSIVE APPROXIMATION, 1
- Quantity:
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Product details
Overview
ADS774KP-4 from Burr-Brown is a 12-bit successive approximation analog-to-digital converter (ADC) with integrated sampling, internal 2.5V reference, microprocessor interface, and three-state parallel outputs. It operates from a single +5V supply, achieves ≤8.5µs max conversion time over temperature, supports ±10V/±5V/0–10V/0–20V input ranges, and replaces ADC574/ADC674/ADC774 in new designs.
For engineers reviewing the ADS774KP-4 datasheet, ADS774KP-4 pinout, ADS774KP-4 application, or ADS774KP-4 equivalent, this page delivers verified electrical specs, package mapping to 28-pin 0.6" DIP, confirmed control logic behavior (R/C, CE, CS, AO, 12/8), real-world timing constraints (tAQ + tC = 8.5µs), and validated alternative options for industrial data acquisition and embedded control systems.
Technical Context
The ADS774KP-4 implements charge-redistribution successive approximation using a laser-trimmed capacitor DAC (CDAC) in low-power CMOS. It integrates internal clock, scaling resistors for four input ranges, and dual-mode operation: S/H Control Mode (aperture jitter = 300ps rms at VEE = +5V) and ADC774 Emulation Mode (aperture delay = 1.6µs at VEE = –15V).
Its microprocessor interface supports fully controlled operation (via CE, CS, R/C, AO, 12/8) or stand-alone mode (R/C only), with configurable 8-/12-bit cycles, left-justified 8-bit byte reads, and STATUS-driven data latching. Internal reference output supplies up to 0.5mA for external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Conversion Time | ≤8.5µs - includes both acquisition and conversion; enables 117kHz max sampling rate over –40°C to +85°C. |
| Input Ranges | ±10V, ±5V, 0–10V, 0–20V - selectable via external resistor networks; LSB = 4.88mV (±10V range). |
| DC Accuracy | ±0.5 LSB linearity error (typ), ±4 LSB unipolar offset error (max over temp) - calibrated at +25°C and stable over operating range. |
| Power Supply | +5V only required; –15V optional on VEE pin - eliminates need for ±15V rails while supporting legacy ADC774 socket compatibility. |
| Reference | Internal 2.5V ±0.1V (typ), 0.5mA source capability - eliminates external reference IC and reduces BOM count. |
| Output Interface | Parallel 12-bit three-state TTL/CMOS outputs - supports direct connection to 8-bit or 16-bit buses with byte-select (AO) and mode control (12/8). |
Pinout & Package
ADS774KP-4 is housed in a 28-pin plastic DIP with 0.6" body width (package drawing #215). Pin assignments are validated per official Burr-Brown PDS-1109F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply | +5V main power; no +15V required - simplifies power design vs legacy ADC774. |
| 5 (R/C) | Read/Convert control | Falling edge initiates conversion; rising edge enables data read - dual-function signal reduces control line count. |
| 6 (CE) | Chip Enable | Active-high enable for conversion start or data access - allows bus arbitration in multi-device systems. |
| 3 (CS) | Chip Select | Active-low selection - supports shared data bus with other peripherals. |
| 4 (AO) | Address Offset | Selects MSB byte (AO=0) or LSB+zeros byte (AO=1) in 8-bit read mode - enables seamless integration with 8-bit microcontrollers. |
| 2 (12/8) | Data mode select | High = 12-bit parallel output; Low = byte-multiplexed output - configures interface for 8-bit or 12-bit host systems. |
| 28 (STATUS) | Conversion status | High during conversion; falls when data is latched - provides hardware-ready signal for interrupt-driven reads. |
| 16–27 (DB0–DB11) | Digital output | Three-state parallel data bus - outputs unipolar straight binary or bipolar offset binary depending on input range. |
| 11 (VEE) | Mode control | –15V selects ADC774 Emulation Mode; +5V selects S/H Control Mode - determines aperture jitter (300ps vs 10ns) and system timing requirements. |
| 9 (Analog Common) | Analog ground reference | Must be tied to analog ground plane near device - prevents digital noise coupling into sensitive analog front-end. |
| 15 (Digital Common) | Digital ground reference | Separate from analog common; connected at single point near device - maintains signal integrity in mixed-signal layouts. |
| 13 (10V Range) | Input scaling | Connected for 0–10V or ±5V ranges; left open for 0–20V/±10V - sets internal resistor divider ratio. |
| 14 (20V Range) | Input scaling | Connected for 0–20V or ±10V ranges; left open for 0–10V/±5V - enables wide dynamic range without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample/hold | Eliminates external S/H amplifier in most applications - reduces component count, board area, and signal path errors. |
| Single +5V operation | Removes dependency on ±15V supplies - lowers system cost, improves reliability, and eases compliance with modern low-voltage power architectures. |
| Dual operational modes | Supports drop-in replacement (Emulation Mode) or enhanced performance (S/H Control Mode) - enables migration path from legacy ADC774 designs. |
| Laser-trimmed scaling resistors | Guarantees accurate full-scale calibration across all four input ranges - avoids manual trimming and improves production yield. |
| Three-state parallel outputs | Enables direct connection to shared data buses without external buffers - simplifies interface logic and reduces propagation delay. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage monitoring of motor phase currents and temperature sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor signals at 100kHz with deterministic 8.5µs latency - synchronizes with PWM gate drivers and safety interlocks. Use Value: Single-supply operation and integrated S/H reduce isolation complexity and eliminate drift-prone external hold capacitors. | Use Scenario: Digitizing high-fidelity waveforms in portable oscilloscopes and automated test fixtures. IC Role / Device Role / Timing Role: High-speed data acquisition frontend with ±10V input range and 70dB SINAD - captures transients and harmonics up to 20kHz. Use Value: Low aperture jitter (300ps rms) preserves signal integrity at high input frequencies without requiring external precision S/H. |
| Embedded Data Loggers | Legacy System Upgrades |
Use Scenario: Battery-powered environmental sensors logging voltage outputs from gas, humidity, and pressure transducers. IC Role / Device Role / Timing Role: Low-power 12-bit ADC operating from +5V rail with 120mW max dissipation - extends runtime in energy-constrained deployments. Use Value: Internal 2.5V reference and programmable input ranges simplify analog front-end design and reduce calibration overhead. | Use Scenario: Retrofitting aging industrial controllers originally designed for ADC774 in 28-pin DIP sockets. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement supporting identical PCB layout and firmware - retains existing software timing and register maps. Use Value: Emulation Mode (VEE = –15V) replicates ADC774 timing behavior while delivering improved linearity and lower power consumption. |
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 |
|---|---|---|---|
| ADS774JP | Same 28-pin 0.6" DIP package; ±1 LSB linearity (vs ±0.5 LSB for ADS774KP-4); 68dB SINAD (vs 70dB) | Lower accuracy grade suitable for cost-sensitive industrial monitoring where 12-bit resolution suffices but tight linearity is not critical | Select ADS774JP when budget constraints outweigh need for highest DC precision and SNR |
| ADS774KU | SOIC-28 package (vs DIP); identical ±0.5 LSB linearity and 70dB SINAD; same thermal resistance (100°C/W) | Required for surface-mount production or space-constrained PCBs; lacks through-hole mounting option | Choose ADS774KU for automated assembly lines or compact embedded modules needing same performance in smaller footprint |
Compared with ADS774JP and ADS774KU, the ADS774KP-4 uniquely combines 0.6" DIP mechanical compatibility, top-tier DC accuracy (±0.5 LSB), and 70dB SINAD in a through-hole package - making it optimal for prototyping, repair, and legacy board upgrades where socket retention and precision coexist.
Availability
ADS774KP-4 is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment development, embedded data loggers, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for ADS774KP-4 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
Burr-Brown Corporation was a U.S.-based analog semiconductor manufacturer specializing in precision data converters, amplifiers, and interface ICs before its acquisition by Texas Instruments in 2000.
The ADS774 product line was engineered for high-accuracy, microprocessor-compatible data acquisition in industrial control, instrumentation, and retrofit applications - emphasizing single-supply operation, integrated references, and socket compatibility with prior-generation converters.
FAQ
What is the maximum sampling rate supported by the ADS774KP-4?
The ADS774KP-4 supports a maximum sampling rate of 117kHz over its full operating temperature range (–40°C to +85°C), based on its guaranteed 8.5µs maximum conversion time including acquisition. At +25°C, the typical sampling rate reaches 125kHz. This throughput is achievable in both S/H Control Mode and ADC774 Emulation Mode, though aperture characteristics differ between modes.
Does the ADS774KP-4 require external components to operate?
The ADS774KP-4 requires minimal external components: a 10µF bypass capacitor on VDD (Pin 1), proper grounding of Analog Common (Pin 9) and Digital Common (Pin 15), and appropriate connections for selected input range (e.g., leaving Pin 14 open for ±10V operation). No external clock, reference, or sample/hold circuitry is needed - all are integrated internally.
How does the ADS774KP-4 handle bipolar versus unipolar input signals?
The ADS774KP-4 natively supports both bipolar (±5V, ±10V) and unipolar (0–10V, 0–20V) inputs via internal laser-trimmed scaling resistors. Output coding follows unipolar straight binary (USB) for unipolar ranges and bipolar offset binary (BOB) for bipolar ranges. Offset and full-scale calibration points are adjustable using external potentiometers connected to dedicated pins.
Can the ADS774KP-4 interface directly with an 8-bit microcontroller bus?
Yes, the ADS774KP-4 supports direct 8-bit bus interfacing via its byte-multiplexed output mode. When 12/8 = LOW, AO = LOW reads the 8 MSBs (DB4–DB11), and AO = HIGH reads the 4 LSBs followed by four forced zeros (DB0–DB3 + 0000). This left-justified format allows storage in two consecutive memory locations without bit-shifting in firmware.
What is the role of the VEE pin on the ADS774KP-4?
The VEE pin (Pin 11) is a logic-level mode selector, not a power supply. Applying –15V configures ADC774 Emulation Mode (1.6µs aperture delay); applying +5V enables S/H Control Mode (300ps aperture jitter). VEE = 0V yields intermediate behavior. No current flows into VEE - it functions solely as a voltage-controlled configuration input.
ADS774KP-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
ADS774KP-4 FAQ
1.How can I place an order for ADS774KP-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774KP-4 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 ADS774KP-4 reliable?
The price and inventory of ADS774KP-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774KP-4 is usually 5 days.
3.What payment methods are accepted for ADS774KP-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774KP-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774KP-4?
ADS774KP-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774KP-4 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 ADS774KP-4?
For technical support, including ADS774KP-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774KP-4 requirements.
6.How does Aetrix verify that ADS774KP-4 is sourced from the original manufacturer or authorized distributors?
All ADS774KP-4 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 ADS774KP-4 meets industry standards.
7.What is the process for return or replacement of ADS774KP-4?
All ADS774KP-4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS774KP-4, 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 ADS774KP-4 part is unused and in its original packaging.
Return procedure for ADS774KP-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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