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Texas Instruments ADS774JE
- Part No.:
- ADS774JE
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS774JE.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
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Product details
Overview
ADS774JE from Burr-Brown Corporation is a 12-bit successive approximation analog-to-digital converter (ADC) with integrated sample/hold, internal 2.5V reference, and microprocessor-compatible parallel interface. It operates from a single +5V supply, delivers ≤8.5µs max conversion time over temperature, supports ±10V/±5V/0–10V/0–20V input ranges, and replaces ADC574/ADC674/ADC774 in legacy industrial data acquisition systems.
For engineers reviewing the ADS774JE datasheet, ADS774JE pinout, ADS774JE application, or ADS774JE equivalent, this page provides verified technical context for drop-in replacement evaluation, single-supply system integration, high-throughput sampling without external S/H, and ±1LSB linearity validation across 0°C to +70°C.
Technical Context
The ADS774JE implements charge-redistribution successive approximation using a laser-trimmed capacitor array (CDAC), enabling on-chip sampling with 1.4µs full-scale settling time and aperture jitter as low as 300ps rms (VEE = +5V). Its dual-mode operation-S/H Control Mode (no external S/H required) and ADC774 Emulation Mode (socket-compatible)-is selected via VEE pin voltage (0V/+5V for Control Mode; –15V for Emulation Mode).
It features TTL/CMOS-compatible control logic (CE, CS, R/C, AO, 12/8), three-state parallel outputs (DB0–DB11, STATUS), and internal scaling resistors for four standard input ranges. Conversion length (8- or 12-bit) is latched on R/C falling edge, and output data format (straight binary or offset binary) depends on input polarity configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes and full 12-bit monotonicity over temperature |
| Conversion Time | 8.5 µs max (TMIN to TMAX) - enables 117 kHz sustained sampling rate without pipeline latency |
| DC Accuracy | ±1 LSB linearity error - ensures calibrated measurement fidelity without post-conversion linearization |
| Input Ranges | ±10V, ±5V, 0–10V, 0–20V - selectable via external resistor networks; no external op-amp scaling needed |
| Power Dissipation | 120 mW max - compatible with +5V-only operation; eliminates need for ±15V supplies |
| Reference | Internal 2.5V ±40mV - stable, laser-trimmed source supplying up to 0.5mA for external circuitry |
| Temperature Range | 0°C to +70°C (specification) - validated for commercial-grade industrial control and test equipment |
Pinout & Package
ADS774JE is housed in a 28-pin 0.3" wide plastic DIP package (drawing number 246), with 0.1" lead pitch and through-hole mounting. Pin 7 is NC (not internally connected); pins 9 (Analog Common) and 15 (Digital Common) must be tied together at the device and routed to separate analog/digital ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | +5V Power Supply | Only supply required; no ±15V needed - simplifies power design and reduces BOM count |
| 5 (R/C) | Read/Convert Control | Falling edge initiates conversion; rising edge enables data read - eliminates separate START and READ signals |
| 6 (CE) | Chip Enable | Active-high enable for bus arbitration; allows multiple converters on shared data bus |
| 11 (VEE) | Mode Selection Input | –15V selects ADC774 Emulation Mode; +5V/0V selects S/H Control Mode - no external logic needed |
| 16–27 (DB0–DB11) | Parallel Data Output | Three-state, MSB-first; configurable for 12-bit simultaneous or 8-bit nibble reads - supports 8- and 16-bit microprocessors |
| 28 (STATUS) | Conversion Status Flag | High during conversion; falls when data is valid - provides hardware-ready signal for interrupt-driven reads |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample/Hold | Eliminates external S/H amplifier in >90% of applications - reduces board area, cost, and signal path errors |
| Dual Operation Modes | Hardware-selectable S/H Control Mode (low-jitter) or ADC774 Emulation Mode (drop-in socket replacement) - preserves legacy firmware and layout |
| Single +5V Supply | No ±15V required - removes need for negative rail generation and associated filtering components |
| Laser-Trimmed Scaling Resistors | Enables precise 0–10V, 0–20V, ±5V, ±10V input ranges without external gain-setting resistors - improves channel-to-channel matching |
| Microprocessor Interface | TTL/CMOS-compatible CE/CS/R/C/AO/12/8 controls with three-state outputs - direct connection to 8051, Z80, or 68K buses without level shifters |
Applications
| Industrial PLC Analog Input Module | Legacy Test Equipment Retrofit |
|---|---|
Use Scenario: Digitizing sensor outputs (thermocouples, strain gauges) in programmable logic controller backplanes with strict timing constraints and space limitations. IC Role / Device Role / Timing Role: Primary ADC performing real-time voltage-to-digital conversion with integrated S/H, eliminating external hold amplifiers and reducing cycle time by 2.3µs per channel. Use Value: Enables 117kHz sampling across 16 channels using single +5V rail, cutting power supply complexity and improving thermal stability vs. ADC774-based designs. | Use Scenario: Upgrading aging automated test systems originally designed around ADC774, where PCB layout and firmware cannot be modified. IC Role / Device Role / Timing Role: Socket-compatible ADC replacement operating in Emulation Mode with identical timing and pinout - no PCB rework or software changes required. Use Value: Delivers 12-bit resolution and ±1LSB linearity while reducing power consumption by 45% and eliminating dependency on ±15V supplies. |
| Portable Data Logger | Motor Drive Current Sensing |
Use Scenario: Battery-powered field instruments acquiring multi-range analog signals (±10V transducer outputs, 0–20mA loop sensors) with minimal component count. IC Role / Device Role / Timing Role: Standalone ADC controlled via R/C line, using internal reference and scaling to support dual-range inputs without external precision resistors. Use Value: Achieves 12-bit accuracy at 120mW total dissipation, extending battery life while maintaining compatibility with existing analog front-end topologies. | Use Scenario: Closed-loop current feedback in IGBT-based motor drives requiring fast, accurate digitization of shunt voltage (±5V range) synchronized to PWM switching. IC Role / Device Role / Timing Role: High-speed ADC operating in S/H Control Mode with 300ps aperture jitter - captures transient current peaks without aliasing or phase error. Use Value: Supports 20kHz current sampling with <0.1% gain error drift, enabling tighter torque control and reduced thermal stress on power stages. |
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 |
|---|---|---|---|
| ADS774KP | Same architecture and pinout; ±1/2 LSB linearity (vs. ±1 LSB) and 70dB SINAD (vs. 68dB) | Requires tighter calibration tolerance; suited for metrology-grade instrumentation over extended temperature | Select ADS774KP only if ±1/2 LSB linearity is mandated and 0.3" DIP footprint is not required |
| ADS774JU | Identical electrical specs; SOIC-28 package (vs. 0.3" DIP); θJA = 100°C/W same | Enables surface-mount assembly and higher board density; requires reflow-compatible layout | Choose ADS774JU for new SMT designs; ADS774JE remains optimal for through-hole prototyping and repair |
Compared with ADS774KP and ADS774JU, the ADS774JE offers the lowest-cost path for commercial-temperature through-hole integration, balancing proven reliability, socket compatibility with legacy ADC774 layouts, and sufficient accuracy for industrial control without over-specifying performance.
Availability
ADS774JE is available at Aetrix Electronics and suitable for industrial PLC analog input modules, legacy test equipment retrofits, portable data loggers, motor drive current sensing, and embedded data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for ADS774JE 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, known for high-precision data converters and signal-conditioning ICs.
The ADS774JE belongs to Burr-Brown's legacy sampling ADC product line, engineered specifically for industrial and instrumentation applications demanding single-supply operation, integrated S/H, and seamless migration from industry-standard 574/674/774 families.
FAQ
What is the maximum sampling rate achievable with the ADS774JE?
The ADS774JE achieves a maximum sustained sampling rate of 117 kHz over its full specified temperature range (0°C to +70°C), based on its guaranteed 8.5 µs maximum conversion time including acquisition. This rate is maintained under worst-case conditions with VDD = +5V, fIN = 10 kHz, and all electrical parameters within limits. The ADS774JE does not require external clocking or pipeline staging to reach this throughput.
Does the ADS774JE require external power supplies beyond +5V?
No, the ADS774JE operates fully from a single +5V supply (VDD on Pin 1). The –15V supply sometimes seen in legacy ADC774 designs is optional and only used on Pin 11 (VEE) to select Emulation Mode; it is not required for basic functionality. In S/H Control Mode, VEE may be tied to 0V or +5V, and power dissipation remains ≤120 mW.
How does the ADS774JE handle bipolar versus unipolar input ranges?
The ADS774JE supports both bipolar (±5V, ±10V) and unipolar (0–10V, 0–20V) inputs via external resistor networks connected to dedicated pins (10VIN, 20VIN, Bipolar Offset). Output coding follows unipolar straight binary (USB) or bipolar offset binary (BOB) formats, automatically selected based on input configuration. Full-scale calibration and offset adjustments are supported for both modes using on-chip trim points.
Can the ADS774JE replace an ADC774 without hardware modifications?
Yes, the ADS774JE is explicitly designed as a drop-in replacement for ADC774 in most applications when operated in ADC774 Emulation Mode (VEE = –15V). It matches the pinout, timing, and control protocol of the ADC774, retains compatibility with existing sockets and firmware, and improves DC accuracy and power efficiency without requiring PCB changes or layout revision.
What is the role of the STATUS pin (Pin 28) in ADS774JE operation?
The STATUS pin (Pin 28) on the ADS774JE outputs HIGH during conversion and transitions LOW only after conversion completion and data latching. This provides a hardware-ready signal for interrupt-driven data reads, eliminates polling overhead, and ensures data validity before bus access. During conversion, STATUS also forces DB0–DB11 into high-impedance state, preventing bus contention on shared microprocessor data lines.
ADS774JE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- 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:
- -
ADS774JE FAQ
1.How can I place an order for ADS774JE through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS774JE 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 ADS774JE reliable?
The price and inventory of ADS774JE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS774JE is usually 5 days.
3.What payment methods are accepted for ADS774JE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS774JE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS774JE?
ADS774JE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS774JE 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 ADS774JE?
For technical support, including ADS774JE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS774JE requirements.
6.How does Aetrix verify that ADS774JE is sourced from the original manufacturer or authorized distributors?
All ADS774JE 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 ADS774JE meets industry standards.
7.What is the process for return or replacement of ADS774JE?
All ADS774JE units undergo pre-shipment inspection (PSI). If there is an issue with ADS774JE, 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 ADS774JE part is unused and in its original packaging.
Return procedure for ADS774JE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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