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Texas Instruments ADS774KP
- Part No.:
- ADS774KP
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
ADS774KP.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
ADS774KP from Burr-Brown Corporation 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 data acquisition systems requiring high-speed, low-power digitization.
For engineers reviewing the ADS774KP datasheet, ADS774KP pinout, ADS774KP application, or ADS774KP equivalent, this page delivers verified technical context on its S/H control mode, bipolar offset binary output format, ±1/2 LSB linearity error at 0°C to +70°C, 70 dB SINAD, and compatibility with 8-bit or 12-bit microprocessor buses via configurable R/C, CE, CS, AO, and 12/8 control lines.
Technical Context
The ADS774KP implements charge-redistribution successive approximation using a laser-trimmed capacitor array (CDAC), enabling internal sampling without external S/H in Control Mode. Its dual operating modes-S/H Control Mode (aperture jitter ≤10 ns rms with VEE = –15V) and ADC774 Emulation Mode (1.6 µs aperture delay)-are selected by VEE voltage level applied to Pin 11.
It features TTL/CMOS-compatible control logic with five inputs (CE, CS, R/C, AO, 12/8) supporting fully controlled or stand-alone operation. Output data format is unipolar straight binary (USB) or bipolar offset binary (BOB), with 12-bit parallel outputs (DB0–DB11) and STATUS flag indicating conversion status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function with no missing codes across full temperature range. |
| Conversion Time | ≤8.5 µs max (TMIN to TMAX) - enables 117 kHz sustained sampling rate including acquisition and conversion. |
| DC Accuracy | ±1/2 LSB linearity error - ensures precise digitization of slow-varying signals without calibration overhead. |
| SINAD | 70 dB at +25°C - supports accurate measurement of medium-frequency analog signals up to ~20 kHz. |
| Input Ranges | ±10V, ±5V, 0–10V, 0–20V - selectable via external resistor networks; internal scaling resistors eliminate need for external gain stages. |
| Supply Voltage | +5V only required (VEE optional) - simplifies power design versus legacy ±15V ADCs like ADC774. |
| Power Dissipation | 120 mW max - reduces thermal load in dense PCB layouts and enables use in low-power embedded DAQ. |
Pinout & Package
ADS774KP is housed in a 28-pin 0.6" wide plastic DIP package (Package Drawing #215), with 2.54 mm pitch, through-hole mounting, and industry-standard footprint compatible with legacy ADC774 sockets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | VDD / STATUS | VDD: +5V supply input; STATUS: active-HIGH during conversion, falls after data latching - used as read-strobe signal. |
| 2, 3 | NC / CS | Pin 2 not internally connected; CS (active-low chip select) enables conversion initiation or data read when LOW. |
| 4, 5 | AO / R/C | AO selects 8-bit (HIGH) or 12-bit (LOW) mode; R/C = LOW initiates conversion, HIGH enables output buffers. |
| 6, 7 | CE / NC | CE (active-high chip enable) must be HIGH to initiate conversion or read data; Pin 7 not internally connected. |
| 8–10 | DB0–DB2 | LSB data outputs (DB0 = LSB); three-state buffered - high-impedance during conversion, enabled only when R/C=HIGH, STATUS=LOW, CE=HIGH, CS=LOW. |
| 11–14 | DB3–DB6, 10VIN | DB3–DB6: mid-range data bits; 10VIN: input for 0–10V or ±5V range selection - must be unconnected when using 20V range. |
| 15–17 | Digital Common, DB7–DB9 | Digital Common (Pin 15) is separate from Analog Common (Pin 9); DB7–DB9: upper mid-range data bits. |
| 18–21 | DB10–DB11, REF OUT, REF IN | DB10–DB11: MSBs; REF OUT: +2.4–2.6V internal reference output; REF IN: accepts external reference or connects to REF OUT for internal use. |
| 22–24 | Bipolar Offset, 20VIN, Analog Common | Bipolar Offset: adjusts zero point for bipolar ranges; 20VIN: enables 0–20V/±10V range - must be unconnected when using 10V range; Analog Common (Pin 9) must tie to analog ground near device. |
| 25–27 | VEE, NC*, NC* | VEE (Pin 25): logic-level input selecting S/H mode (–15V = Emulation Mode, +5V = Control Mode); Pins 26–27 not internally connected. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample-and-Hold | Eliminates external S/H amplifier in most applications when used in S/H Control Mode, reducing BOM count and layout complexity. |
| Single +5V Operation | Removes need for ±15V supplies required by ADC574/ADC674/ADC774, lowering system cost and improving power efficiency. |
| Configurable Data Interface | Supports 12-bit parallel bus or 8-bit byte-wide transfers (MSB first, LSB second with trailing zeros) via AO and 12/8 pins - compatible with both 8-bit and 16-bit microcontrollers. |
| Laser-Trimmed Input Scaling | On-chip precision resistors enable four standard input ranges without external components, ensuring consistent gain accuracy across units. |
| Dual Operating Modes | Drop-in replacement capability (ADC774 Emulation Mode) and enhanced performance (S/H Control Mode) allow seamless migration and new design optimization. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous digitization of ±10V sensor outputs (e.g., strain gauges, RTDs) in PLC I/O modules operating at ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Primary 12-bit ADC performing real-time analog input capture with 117 kHz throughput and ±1/2 LSB linearity for closed-loop control feedback. Use Value: Enables deterministic sampling without external S/H, reducing latency and component count while maintaining traceable calibration across production units. |
Use Scenario: Digitizing calibrated AC waveforms in portable oscilloscopes and spectrum analyzers requiring ≥70 dB SINAD at 10–20 kHz input frequencies. IC Role / Device Role / Timing Role: High-fidelity front-end ADC delivering bipolar offset binary output synchronized to microcontroller read cycles via STATUS flag. Use Value: Provides stable 70 dB SINAD and <10 ns rms aperture jitter in Control Mode, supporting accurate FFT-based spectral analysis without post-processing correction. |
| Medical Instrumentation | Automotive Diagnostic Tools |
|
Use Scenario: Acquisition of biopotential signals (ECG, EEG) scaled to ±5V range in battery-powered patient monitors with strict power budget constraints. IC Role / Device Role / Timing Role: Low-power 12-bit ADC operating from single +5V supply, delivering 120 mW max dissipation and 12-bit resolution for waveform fidelity. Use Value: Eliminates need for dual-supply op-amps and external reference ICs, simplifying analog front-end design while meeting IEC 60601 leakage current requirements. |
Use Scenario: Reading analog sensor outputs (oxygen, throttle position, coolant temp) in handheld OBD-II scanners interfacing with 8-bit microcontrollers via parallel bus. IC Role / Device Role / Timing Role: Microprocessor-compatible ADC configured for 8-bit byte reads (AO toggled per address bit) to match 8-bit data bus architecture. Use Value: Allows direct connection to 8-bit MCU without glue logic, leveraging left-justified 4-LSB+zeros format for efficient memory-mapped storage in two consecutive locations. |
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 |
|---|---|---|---|
| ADS774KE | Same die, 28-pin 0.3" DIP package; identical specs except θJA = 100°C/W (same as KP) and same ±1/2 LSB linearity. | Preferred where board space is constrained and 0.3" DIP footprint is required; pinout identical but narrower body. | Select ADS774KE if PCB layout uses 0.3" DIP socket; electrical and timing behavior is identical to ADS774KP. |
| ADS774KU | Same die, 28-lead SOIC package; identical DC/AC specs, but thermal resistance and mounting differ (surface-mount vs through-hole). | Used in automated assembly environments requiring reflow-soldered components and higher board density. | Choose ADS774KU for volume production with pick-and-place assembly; requires SOIC-compatible layout and reflow profile. |
Compared with ADS774KP, ADS774KE offers identical performance in a space-saving 0.3" DIP, while ADS774KU provides surface-mount flexibility without sacrificing resolution or speed - all three share the same internal CDAC architecture, control logic, and 70 dB SINAD specification.
Availability
ADS774KP is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, and automotive diagnostic tools requiring stable component supply, long-lifecycle support, and drop-in replacement capability for legacy ADC774-based systems.
Supply support for ADS774KP 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 pioneer, acquired by Texas Instruments in 2000, renowned for high-precision data converters, amplifiers, and interface ICs targeting industrial and instrumentation markets.
The ADS774KP belongs to Burr-Brown's legacy 12-bit parallel ADC product line, designed specifically for microprocessor-based data acquisition systems needing integrated sampling, single-supply operation, and pin-compatible upgrade paths from ADC574/ADC674/ADC774.
FAQ
What is the maximum operating temperature range for the ADS774KP?
The ADS774KP is specified for 0°C to +70°C operation, with guaranteed performance including ±1/2 LSB linearity error and 70 dB SINAD across that full range. Its storage temperature extends to –65°C to +150°C, and it can operate transiently up to +85°C, though datasheet specifications apply only within the 0°C to +70°C range.
Does the ADS774KP require an external reference voltage?
No, the ADS774KP includes an internal +2.4V to +2.6V bandgap reference with 0.5 mA source capability. REF OUT and REF IN pins allow direct loopback for internal use or connection to external precision references - external reference is optional, not required for basic operation.
How does the ADS774KP handle bipolar input signals?
The ADS774KP supports bipolar inputs (±5V, ±10V) using bipolar offset binary (BOB) output coding. The Bipolar Offset pin (Pin 22) allows hardware adjustment of zero-point calibration, and internal scaling resistors ensure correct full-scale mapping without external components.
Can the ADS774KP interface directly with an 8-bit microcontroller bus?
Yes, the ADS774KP supports 8-bit interface via its AO and 12/8 control pins. When 12/8 = LOW, AO = LOW reads the 8 MSBs and AO = HIGH reads the 4 LSBs plus four trailing zeros - enabling full 12-bit data capture in two sequential 8-bit reads compatible with standard 8-bit address/data buses.
What is the purpose of the VEE pin on the ADS774KP?
The VEE pin (Pin 25) is a logic-level input-not a power supply-that selects operating mode: –15V enables ADC774 Emulation Mode (1.6 µs aperture delay), while +5V enables S/H Control Mode (10 ns rms jitter). VEE = 0V yields intermediate behavior; no current flows into VEE under normal operation.
ADS774KP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS774KP FAQ
1.How can I place an order for ADS774KP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774KP 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 reliable?
The price and inventory of ADS774KP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774KP is usually 5 days.
3.What payment methods are accepted for ADS774KP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774KP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774KP?
ADS774KP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774KP 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?
For technical support, including ADS774KP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774KP requirements.
6.How does Aetrix verify that ADS774KP is sourced from the original manufacturer or authorized distributors?
All ADS774KP 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 meets industry standards.
7.What is the process for return or replacement of ADS774KP?
All ADS774KP units undergo pre-shipment inspection (PSI). If there is an issue with ADS774KP, 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 part is unused and in its original packaging.
Return procedure for ADS774KP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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