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Texas Instruments TLC2574IDW
- Part No.:
- TLC2574IDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC2574IDW.pdf
- Description:
- IC ADC 12BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,683
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Product details
Overview
TLC2574IDW from Texas Instruments is a 12-bit, 4-channel single-ended SAR analog-to-digital converter (ADC) with SPI/DSP-compatible serial interface, ±10 V bipolar input range, 200-KSPS maximum throughput, and integrated 8× FIFO. It operates from a single 5-V analog supply and 3-/5-V digital supply, targeting precision data acquisition in industrial control and test equipment.
For engineers reviewing the TLC2574IDW datasheet, TLC2574IDW pinout, TLC2574IDW application, or TLC2574IDW equivalent, key selection criteria include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling (normal/short/extended), built-in conversion clock, and 20-pin TSSOP (DW) package compatibility with system-level timing and isolation requirements.
Technical Context
The TLC2574IDW implements a successive approximation register (SAR) architecture with on-chip analog multiplexer selecting among four single-ended inputs (A0–A3), internal scaling for ±10 V full-scale range, and programmable sampling modes controlled via CSTART or internal counter. Its conversion clock is either internal 6.5-MHz oscillator or external SCLK up to 25 MHz.
Serial communication supports both SPI (CS/SDI/SDO/SCLK) and DSP (FS/SDI/SDO/SCLK) protocols; EOC/INT provides conversion-ready signaling, while CS enables multi-device bus arbitration. The device features autopower-down mode (20 µA) and low-noise analog front-end with 30-pF sample capacitance and ≤25-Ω source impedance requirement for normal sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 12-bit linear output codes without interpolation or oversampling. |
| Input Channels | 4 single-ended (A0–A3) - supports discrete sensor monitoring without external MUX or signal conditioning. |
| Input Range | ±10 V bipolar - accommodates industrial transducer outputs without external level-shifting circuitry. |
| Throughput Rate | 200 KSPS - enables real-time capture of signals up to ~700 kHz bandwidth (−1 dB point). |
| INL / DNL | ±0.5 LSB - ensures monotonicity and <0.1% full-scale linearity error across temperature. |
| Power Consumption | 5.8 mA normal / 20 µA power-down - reduces thermal load and enables battery-backed operation. |
| SINAD @ 20 kHz | 72 dB typical - corresponds to ~11.7 effective bits for medium-frequency signal fidelity. |
| Supply Voltages | AVDD = 4.75–5.5 V; DVDD = 2.7–5.5 V - supports mixed-voltage system integration with 3.3 V or 5 V logic. |
Pinout & Package
Package: 20-pin TSSOP (DW), 0.65 mm pitch, RoHS-compliant surface-mount package with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A3 | Analog input channels | Selectable single-ended inputs; require ≤25 Ω source impedance for accurate sampling without CSTART extension. |
| AGND, DGND | Analog/digital ground returns | Separate ground pins minimize digital noise coupling into analog path; must be connected at single-point star ground. |
| AVDD, DVDD | Analog/digital supply rails | Independent 5 V supplies enable noise isolation; AVDD powers SAR core and reference buffer. |
| CS | Chip select (SPI slave select) | Falling edge initiates conversion cycle and enables serial interface; tied low for single-device SPI use. |
| SCLK | Serial clock input | Up to 25 MHz; serves as data clock and optional external conversion clock source. |
| SDI/SDO | Serial data in/out | 4-bit command + 12-bit result (MSB-first); SDO tri-stated when CS high for bus sharing. |
| EOC/INT | End-of-conversion interrupt | Falling edge signals data readiness; cleared by CS↓, FS↑, or CSTART↓ - supports polled or interrupt-driven firmware. |
| CSTART | Hardware sampling trigger | Asynchronous control of sample period; required for high-impedance sources (>25 Ω) or precise timing alignment. |
| REFP/REFM | External reference inputs | Define ±10 V full-scale range; require 10 µF || 0.1 µF decoupling between pins for stable reference. |
| COMP | Internal compensation | Connect 0.1 µF capacitor to AGND to stabilize internal op-amp used in reference buffer and comparator. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in 8× FIFO | Reduces host processor interrupt frequency and eliminates data loss during burst conversions. |
| Programmable sampling modes | Normal (44 SCLK), short (12 SCLK), or extended (CSTART-controlled) - adapts to source impedance and timing constraints. |
| Hardware default configuration | SDI tied to DVDD enables operation without software initialization - simplifies boot-up in resource-constrained systems. |
| Autopower-down mode | Enters 20 µA standby automatically after conversion completes - extends battery life in portable instrumentation. |
| Pseudodifferential capability | Uses REFP/REFM as differential reference pair - improves common-mode rejection over single-ended references. |
| Multiple serial interface options | Native SPI and DSP protocol support - enables direct connection to TI C2000, C6000, or ARM-based controllers without glue logic. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage monitoring of 4-channel 4–20 mA loop receivers with ±10 V output scaling. IC Role / Device Role / Timing Role: Precision ADC capturing sensor outputs at 100+ KSPS with synchronized sampling and FIFO buffering. Use Value: Eliminates external sample-and-hold and level-shifting components while maintaining ±0.5 LSB linearity over −40°C to 85°C. |
Use Scenario: High-speed digitization of stimulus-response waveforms during functional testing of analog ICs. IC Role / Device Role / Timing Role: Triggered acquisition subsystem using CSTART for precise sampling alignment to stimulus edges. Use Value: Achieves 72 dB SINAD at 20 kHz with hardware-controlled sampling, reducing post-processing correction overhead. |
| Programmable Logic Controller (PLC) I/O Module | Power Quality Analyzer |
Use Scenario: Analog input card acquiring voltage/current measurements from multiple field sensors in noisy factory environments. IC Role / Device Role / Timing Role: Isolated front-end ADC with separate AGND/DGND and bipolar input range handling transducer offsets. Use Value: Delivers 81 dB channel-to-channel isolation and ±10 V range without external amplifiers or attenuators. |
Use Scenario: Simultaneous sampling of voltage and current waveforms for harmonic analysis and THD calculation. IC Role / Device Role / Timing Role: Dual-channel acquisition node using A0/A1 with synchronized conversions and internal clocking. Use Value: Provides −82 dB THD and 72 dB SINAD at 100 kHz, enabling accurate ENOB >11.3 bits for Class A power metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200-KSPS, SPI-only interface, no FIFO, 2.7–5.25 V supply | Limited to lower-precision applications; lacks bipolar input and hardware sampling control | Select when cost sensitivity outweighs resolution and feature requirements. |
| ADS8320EB | 16-bit resolution, 100-KSPS, SPI interface, no internal oscillator, external reference required | Higher precision but slower throughput; requires external clock and reference design effort | Select when DC accuracy and noise floor dominate over speed and integration. |
Compared with TLC2574IDW, ADS7822U trades resolution and bipolar capability for lower cost and smaller footprint, while ADS8320EB sacrifices speed and integrated clocking for enhanced DC performance-neither offers identical feature parity in sampling flexibility, FIFO depth, or ±10 V input range.
Availability
TLC2574IDW is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and programmable logic controller I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TLC2574IDW 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 TLC2574IDW belongs to TI's precision SAR ADC product line, designed specifically for high-fidelity, low-power data acquisition in harsh industrial environments where reliability, bipolar input range, and flexible serial interfacing are critical.
FAQ
What is the maximum sampling rate supported by the TLC2574IDW?
The TLC2574IDW achieves a maximum throughput rate of 200 KSPS under normal long-sampling conditions with fixed-channel operation in conversion mode 00 or 01. This assumes AVDD = 5 V, SCLK = 25 MHz, and 25 Ω source impedance. Channel switching adds multiplexer settling time, reducing effective rate in auto-sweep configurations. The TLC2574IDW datasheet specifies this limit in Section 6 under "Throughput rate".
Does the TLC2574IDW support true differential input mode?
No, the TLC2574IDW does not support true differential input mode. It accepts four single-ended analog inputs (A0–A3) and uses pseudodifferential referencing via REFP and REFM pins to define the ±10 V full-scale range. The internal analog multiplexer routes each channel to a common SAR core referenced against the external voltage difference between REFP and REFM. True differential input capability is absent per the functional block diagram and terminal descriptions in the TLC2574IDW datasheet.
Can the TLC2574IDW operate with a 3.3-V digital supply only?
Yes, the TLC2574IDW supports DVDD from 2.7 V to 5.5 V, making it fully compatible with 3.3-V digital systems. VIH is specified at 2.1 V (min) for DVDD = 3 V, and VOL is 0.4 V (max) at Io = 0.8 mA, ensuring reliable logic-level compatibility with standard 3.3-V microcontrollers and FPGAs. AVDD remains fixed at 4.75–5.5 V to maintain analog performance.
What is the purpose of the COMP pin on the TLC2574IDW?
On the TLC2574IDW, the COMP pin is the internal compensation node for the reference buffer and comparator amplifier. A 0.1 µF capacitor must be connected between COMP and AGND to ensure stability and prevent oscillation during conversion. Omitting this capacitor degrades AC performance and may cause erratic EOC/INT behavior. This requirement is explicitly stated in the Terminal Functions table and Figure 3 of the TLC2574IDW datasheet.
How does the CSTART pin affect sampling timing in the TLC2574IDW?
The CSTART pin on the TLC2574IDW enables asynchronous, hardware-controlled sampling: a high-to-low transition initiates sampling, and a low-to-high transition ends sampling and starts conversion. Its low time directly sets the sampling period-critical for sources with impedance >25 Ω. CSTART operation is independent of CS and FS levels, but the first CSTART pulse must occur after the 11th SCLK rising edge. This mechanism replaces internal counter-based sampling for precise timing alignment in the TLC2574IDW.
TLC2574IDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 2, 4
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC2574IDW FAQ
1.How can I place an order for TLC2574IDW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2574IDW 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 TLC2574IDW reliable?
The price and inventory of TLC2574IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2574IDW is usually 5 days.
3.What payment methods are accepted for TLC2574IDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2574IDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2574IDW?
TLC2574IDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2574IDW 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 TLC2574IDW?
For technical support, including TLC2574IDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2574IDW requirements.
6.How does Aetrix verify that TLC2574IDW is sourced from the original manufacturer or authorized distributors?
All TLC2574IDW 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 TLC2574IDW meets industry standards.
7.What is the process for return or replacement of TLC2574IDW?
All TLC2574IDW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2574IDW, 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 TLC2574IDW part is unused and in its original packaging.
Return procedure for TLC2574IDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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