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Texas Instruments TLC2578IPW
- Part No.:
- TLC2578IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC2578IPW.pdf
- Description:
- IC ADC 12BIT SAR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:213
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Product details
Overview
TLC2578IPW from Texas Instruments is a 12-bit, 8-channel pseudodifferential 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 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 TLC2578IPW datasheet, TLC2578IPW pinout, TLC2578IPW application, or TLC2578IPW equivalent, key selection considerations include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling modes (normal/short/extended), built-in conversion clock, and TSSOP-20 package compatibility with board space-constrained designs.
Technical Context
The TLC2578IPW implements a charge-redistribution SAR architecture with on-chip analog multiplexer selecting among eight single-ended inputs or pseudodifferential pairs. Its conversion clock is either internal 6.5-MHz oscillator or external SCLK up to 25 MHz, enabling flexible timing control across host processor interfaces.
It supports three serial interface modes: SPI (CS-initiated), DSP (FS-initiated), and hardware-default (SDI tied to DVDD). The CSTART pin enables asynchronous extended sampling independent of SCLK/CS/FS timing, critical for high-impedance signal sources requiring precise aperture control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = ±2.44 mV over ±10 V full-scale range |
| Throughput Rate | 200 KSPS - fixed-channel conversion speed sufficient for real-time motor current sensing and sensor monitoring |
| Analog Input Range | ±10 V bipolar - supports direct connection to industrial transducers without external level-shifting |
| INL / DNL | ±0.5 LSB - ensures monotonicity and <0.012% linearity error for closed-loop control accuracy |
| SINAD | 72 dB at 20 kHz - corresponds to ~11.7 effective bits for audio-band signal fidelity |
| Power Consumption | 5.8 mA normal / 20 µA power-down - enables low-power operation in battery-backed DAQ systems |
| Supply Voltages | AVDD = 4.75–5.5 V; DVDD = 2.7–5.5 V - allows mixed-voltage system integration with 3.3 V or 5 V logic |
Pinout & Package
Package: 20-pin TSSOP (PW), 4.4 mm × 6.5 mm body, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Drives SDI latching and SDO shifting; doubles as external conversion clock source up to 25 MHz |
| FS | Frame sync input | Indicates start of serial frame in DSP mode; must be tied to DVDD if unused in SPI configuration |
| SDI | Serial data input | Accepts 4-bit command + optional 12-bit config; hardware default enabled when tied to DVDD |
| EOC/INT | End-of-conversion interrupt output | Active-low pulse signals data readiness; cleared by CS↓, FS↑, or CSTART↓ |
| SDO | 3-state serial data output | MSB-first 12-bit result; high-impedance when CS = high; valid before first SCLK falling edge |
| DGND | Digital ground reference | Return path for digital I/O; must be separated from AGND except at single-point star ground |
| DVDD | Digital supply voltage | Supplies core logic and interface; accepts 2.7–5.5 V for 3.3 V or 5 V system compatibility |
| CS | Chip select input | Enables serial interface and resets internal counter; functions as slave select in SPI mode |
| A0–A7 | Analog input channels | Eight single-ended inputs; internally multiplexed; source impedance ≤25 Ω required for normal sampling |
| CSTART | External sampling trigger | Controls hold time in extended sampling mode; low pulse duration defines aperture window |
| AVDD | Analog supply voltage | 5 V ±5% supply for ADC core and MUX; requires local 10 µF + 0.1 µF decoupling |
| AGND | Analog ground reference | Return for analog circuitry; separate from DGND to minimize digital noise coupling into conversion |
| COMP | Internal compensation | Requires 0.1 µF capacitor to AGND for stable internal op-amp operation |
| REFM | Negative reference input | Connected to AGND; sets lower bound of ±10 V input range |
| REFP | Positive reference input | Accepts 3.96–4.04 V; differential with REFM defines full-scale; requires 10 µF || 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Built-in 8× FIFO | Buffers consecutive conversions without host intervention, reducing CPU overhead in burst-sampling applications |
| Programmable autochannel sweep | Automatically cycles through selected analog inputs without software polling, ideal for multi-sensor monitoring |
| Hardware-controlled sampling period | Three modes-normal (4 SCLK), short (12 SCLK), extended (CSTART-triggered)-optimize SNR vs. speed trade-offs |
| Single-supply analog operation | 5 V AVDD only eliminates need for dual ±15 V supplies, simplifying power design in compact instrumentation |
| Low-power autopower-down | Enters 20 µA sleep state between conversions, extending runtime in portable or energy-harvested systems |
Applications
| Industrial Process Monitoring | Motor Drive Current Sensing |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC performing synchronized 8-channel scanning at 10–100 Hz update rates. Use Value: ±0.5 LSB INL ensures <0.012% measurement consistency across sensor calibration curves over temperature. |
Use Scenario: Isolated phase current sampling in 3-phase inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: High-speed ADC capturing current peaks during PWM switching intervals with programmable short-sampling mode. Use Value: 200-KSPS throughput and 72 dB SINAD enable accurate RMS calculation and overcurrent detection within 5 µs latency. |
| Portable Test Equipment | Energy Metering Front-End |
Use Scenario: Battery-powered handheld multimeter acquiring DC voltage, AC RMS, and diode test readings. IC Role / Device Role / Timing Role: Low-power ADC operating in autopower-down mode between manual trigger events. Use Value: 20 µA standby current extends battery life to >100 hours on two AA cells while maintaining ±10 V input capability. |
Use Scenario: Voltage and current channel digitization in Class 0.5 polyphase electricity meters with anti-tampering diagnostics. IC Role / Device Role / Timing Role: Precision ADC providing calibrated 12-bit samples to metrology DSP for harmonic analysis and billing computation. Use Value: Bipolar ±10 V range accommodates both voltage transformer (VT) and current transformer (CT) secondary outputs without gain switching. |
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, no FIFO, 200-KSPS, SPI-only interface, 3-V supply only | Lacks bipolar input, no extended sampling, lower precision limits use in calibration-critical systems | Select when cost-sensitive, low-resolution, single-supply 3 V designs dominate and FIFO is unnecessary |
| MAX11100ETE+ | 12-bit, 8-channel, 500-KSPS, internal reference, 2.7–3.6 V DVDD only | Integrated 4.096 V reference eliminates external REFP/REFM components but fixes full-scale to ±2.048 V | Choose for simplified BOM in 3.3 V systems where ±2 V range suffices and higher speed justifies layout changes |
Compared with ADS7822U and MAX11100ETE+, the TLC2578IPW uniquely combines ±10 V bipolar input, hardware-configurable sampling, and 8× FIFO in a 20-TSSOP package-making it optimal for industrial DAQ where signal range flexibility, timing control, and host offload are prioritized over raw speed or lowest component count.
Availability
TLC2578IPW is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, portable test equipment, and energy metering front-end designs requiring stable component supply and long-term manufacturability.
Supply support for TLC2578IPW 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 TLC2578IPW belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, multi-channel data acquisition in harsh industrial environments where reliability and parametric consistency are non-negotiable.
FAQ
What is the maximum sampling rate of the TLC2578IPW?
The TLC2578IPW achieves a maximum throughput rate of 200 KSPS in fixed-channel conversion mode (00 or 01) with normal long sampling. This rate assumes internal 6.5-MHz conversion clock and 25-MHz SCLK; actual sustained rate drops when switching channels due to multiplexer settling time. The TLC2578IPW maintains this performance across its full −40°C to +85°C operating range.
Does the TLC2578IPW support bipolar input signals?
Yes, the TLC2578IPW supports true bipolar analog input with a full-scale range of ±10 V, configured via external REFP and REFM pins. When REFM is connected to AGND and REFP is set to 4 V, the device digitizes inputs from −10 V to +10 V with 12-bit resolution. This eliminates need for external level-shifting circuitry in industrial sensor interfaces.
How does the CSTART pin function on the TLC2578IPW?
The CSTART pin on the TLC2578IPW provides hardware-controlled extended sampling: a high-to-low transition initiates sampling, and low-to-high transition starts conversion. Its low-time directly controls aperture duration, enabling precise sampling of high-impedance sources (>25 Ω) where normal SCLK-based sampling would cause errors. CSTART operates independently of CS and FS timing.
What package type is used for the TLC2578IPW?
The TLC2578IPW is packaged in a 20-pin TSSOP (PW) with 4.4 mm × 6.5 mm body size and 0.65 mm lead pitch. This RoHS-compliant surface-mount package offers thermal and electrical performance comparable to SOIC but with 30% smaller footprint-ideal for space-constrained industrial PCBs where reflow compatibility and hand-soldering accessibility matter.
Can the TLC2578IPW operate with a 3.3 V digital supply?
Yes, the TLC2578IPW supports DVDD from 2.7 V to 5.5 V, making it fully compatible with 3.3 V digital systems. Digital inputs meet VIH ≥ 2.1 V and VIL ≤ 0.6 V at DVDD = 3 V, and outputs drive VOH ≥ 2.4 V at −0.2 mA load. This allows seamless integration with 3.3 V microcontrollers and FPGAs without level shifters.
TLC2578IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4, 8
- 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:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC2578IPW FAQ
1.How can I place an order for TLC2578IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2578IPW 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 TLC2578IPW reliable?
The price and inventory of TLC2578IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2578IPW is usually 5 days.
3.What payment methods are accepted for TLC2578IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2578IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2578IPW?
TLC2578IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2578IPW 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 TLC2578IPW?
For technical support, including TLC2578IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2578IPW requirements.
6.How does Aetrix verify that TLC2578IPW is sourced from the original manufacturer or authorized distributors?
All TLC2578IPW 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 TLC2578IPW meets industry standards.
7.What is the process for return or replacement of TLC2578IPW?
All TLC2578IPW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2578IPW, 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 TLC2578IPW part is unused and in its original packaging.
Return procedure for TLC2578IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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