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Texas Instruments TLC0820AIDW
- Part No.:
- TLC0820AIDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC0820AIDW.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
TLC0820AIDW from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring differential reference inputs, parallel microprocessor interface, on-chip track-and-hold, single 5-V supply operation, and ±1 LSB total unadjusted error over –40°C to 85°C. It delivers 2.5 µs max read-mode conversion time and supports high-speed data acquisition in industrial control and test equipment.
For engineers reviewing the TLC0820AIDW datasheet, TLC0820AIDW pinout, TLC0820AIDW application, or TLC0820AIDW equivalent, this page provides verified technical context, real-world interface timing behavior, package-specific layout guidance, and validated alternative options for embedded ADC selection.
Technical Context
The TLC0820AIDW implements a two-stage modified flash architecture: first, a 4-bit flash ADC digitizes the MSBs; then a precision 4-bit DAC generates a reference voltage for a second 4-bit flash comparison on the residual analog difference. This enables full 8-bit resolution with low power and no external clock requirement.
It operates in two distinct modes controlled by the MODE pin: read-only mode (MODE low) uses WR/RDY as a ready output and initiates conversion on RD falling edge; write-read mode (MODE high) uses WR/RDY as a write input and starts conversion on its rising edge, with INT signaling completion after ~800 ns delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital output levels for precise analog signal quantization |
| Conversion Time (Read Mode) | 2.5 µs max - enables ≥400 kSPS sustained sampling when interfaced to fast microprocessors |
| Total Unadjusted Error | ±1 LSB - ensures monotonicity and guarantees no missing codes across full operating temperature range |
| Reference Inputs | Differential (REF+, REF–) - supports ratiometric measurement and flexible full-scale range setting via external voltage divider |
| Supply Voltage | 4.5 V to 5.25 V - compatible with standard TTL/CMOS 5-V logic rails and stable under typical board regulation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade environmental robustness without derating |
| Track-and-Hold Window | 100 ns - captures fast-changing analog signals up to 100 mV/µs slew rate without external components |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANLG IN (Pin 1) | Analog input | Single-ended analog signal entry point; accepts –0.1 V to VCC+0.1 V range with internal sample-and-hold activation |
| CS (Pin 13) | Chip select | Active-low enable for RD/WR recognition; required low state before any bus transaction begins |
| RD (Pin 8) | Read strobe | Falling edge triggers conversion in read mode; enables 3-state outputs and controls data latch timing in write-read mode |
| WR/RDY (Pin 6) | Mode-dependent I/O | Ready output (MODE low) or write input (MODE high); open-drain in read mode, active drive in write-read mode |
| INT (Pin 9) | Interrupt output | Active-low pulse indicating conversion completion; delays ~800 ns after WR/RDY rise in write-read mode |
| OFLW (Pin 18) | Overflow flag | Active-low when ANLG IN exceeds REF+, enabling cascaded 9-/10-bit configurations with multiple devices |
| REF+ / REF– (Pins 12/11) | Differential reference | Define full-scale span; support common-mode voltages from GND to VCC, enabling rail-to-rail input scaling |
| D0–D7 (Pins 2–5, 14–17) | Parallel data outputs | TTL-compatible 3-state outputs; D0 = LSB, D7 = MSB; driven only when CS and RD are low |
| MODE (Pin 7) | Interface mode select | Internally pulled down; high = write-read mode (WR-initiated), low = read-only mode (RD-initiated) |
| VCC (Pin 20) / GND (Pin 10) | Power supply | Single 5-V supply with bypass capacitor requirement; GND serves as analog and digital reference return |
Key Features
| Feature | Design Value |
|---|---|
| No external clock required | Internal timing eliminates need for oscillator circuitry, reducing BOM count and PCB footprint |
| Two operational modes | Hardware-selectable read-only or write-read interface simplifies integration with diverse microprocessor buses |
| On-chip track-and-hold | 100 ns aperture window supports accurate sampling of signals with ≤100 mV/µs slew rate |
| Differential reference architecture | Enables ratiometric measurement and programmable gain by adjusting REF+ and REF– independently |
| Overflow output (OFLW) | Allows daisy-chaining multiple TLC0820AIDW units to extend resolution to 9 or 10 bits without external logic |
Applications
| Industrial Data Acquisition | Automated Test Equipment |
|---|---|
Use Scenario: Real-time monitoring of sensor outputs (temperature, pressure, current) in PLC-based control cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary 8-bit ADC capturing analog process variables at ≥300 kSPS with deterministic latency and minimal external support components. Use Value: Eliminates external sample-and-hold and clock generation, reducing system cost and improving thermal stability in uncooled enclosures. | Use Scenario: High-throughput parametric testing of semiconductor devices requiring synchronized analog stimulus and response capture. IC Role / Device Role / Timing Role: Fast parallel-interface ADC triggered by test controller's RD/WR signals to acquire transient waveforms within tight timing windows. Use Value: 2.5 µs read-mode access time enables sub-microsecond per-sample throughput, accelerating test cycle times. |
| Embedded Motor Control Feedback | Legacy System Upgrades |
Use Scenario: Current sensing and position feedback in brushless DC motor drives where space-constrained PCBs limit component count. IC Role / Device Role / Timing Role: Analog front-end ADC converting shunt voltage and Hall-effect signals into digital values for real-time FOC algorithms. Use Value: Single 5-V supply and integrated track-and-hold reduce power domain complexity and eliminate external hold capacitors. | Use Scenario: Replacement of obsolete National Semiconductor ADC0820C/CC in field-deployed instrumentation with unchanged PCB layout. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement preserving existing firmware timing and address decoding logic. Use Value: Maintains legacy system reliability while extending product lifecycle with TI's long-term manufacturing commitment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC0820CCN | Same pinout and functional interface, but rated for 0°C to 70°C only; lacks –40°C low-temp qualification | Not suitable for extended-temperature industrial deployments; requires thermal margin validation | Select only for commercial-grade systems with controlled ambient environments |
| AD7820KN | CMOS process, 10 µs conversion time, requires external clock; different timing sequence and no OFLW output | Slower throughput and no overflow flag limits multi-device resolution extension capability | Choose only if legacy AD7820K firmware and clock infrastructure already exist |
Compared with ADC0820CCN and AD7820KN, the TLC0820AIDW offers wider temperature range, faster conversion, integrated timing, and cascade-ready overflow signaling-making it the optimal choice for new industrial designs requiring robust, self-contained 8-bit digitization.
Availability
TLC0820AIDW is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, and embedded motor control applications requiring stable component supply, long-lifecycle assurance, and consistent SOIC-20 packaging.
Supply support for TLC0820AIDW 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 digital signal technologies, with decades of experience in precision data converters and industrial-grade ICs.
The TLC0820AIDW belongs to TI's legacy LinCMOS™ precision ADC family, designed specifically for cost-sensitive, high-reliability industrial systems needing fast parallel-interface digitization without external clocks or support components.
FAQ
What is the maximum operating temperature range for the TLC0820AIDW?
The TLC0820AIDW is specified for continuous operation from –40°C to +85°C. This industrial temperature grade is confirmed in the "recommended operating conditions" table of the SLAS064A datasheet and distinguishes it from the commercial-grade TLC0820AC variant (0°C to 70°C). The TLC0820AIDW maintains ±1 LSB total unadjusted error across this full range, making it suitable for harsh-environment applications where thermal stability is critical. Its SOIC-20 (DW) package is rated for MSL Level-1 handling.
Does the TLC0820AIDW require an external clock source?
No, the TLC0820AIDW does not require an external clock source. Its modified flash architecture uses fully internal timing generation, eliminating the need for oscillators, crystals, or clock distribution circuitry. Conversion timing is governed by internal delays such as td(int) (~800 ns) and tconv(R) (≤2.5 µs), which are guaranteed over temperature and supply voltage. This self-timed operation reduces system complexity, PCB area, and potential EMI sources-key advantages confirmed in the device's "Features" section and timing diagrams (Figures 1–4).
How does the MODE pin affect interface timing in the TLC0820AIDW?
The MODE pin selects between two mutually exclusive interface protocols: when MODE is low, the TLC0820AIDW operates in read-only mode where RD falling edge initiates conversion and WR/RDY functions as an open-drain ready signal; when MODE is high, it enters write-read mode where WR/RDY rising edge starts conversion and INT asserts after ~800 ns. These distinct timing sequences-including td(RIL), ta(R1), and td(int)-are fully documented in the "Operating Characteristics" table and Figures 1–4 of the SLAS064A datasheet. Proper MODE configuration is essential for correct microprocessor handshake behavior.
Can the TLC0820AIDW be used in cascaded configurations for higher resolution?
Yes, the TLC0820AIDW supports cascaded operation via its OFLW (overflow) output. When the analog input exceeds REF+, OFLW goes low, signaling that the input is beyond full scale. This flag can be fed into the CS or MODE input of a second TLC0820AIDW to implement 9-bit or 10-bit resolution systems-as illustrated in Figure 6 of the SLAS064A datasheet. No additional logic gates or controllers are needed; the architecture inherently supports this extension using only inter-device wiring and shared reference voltages.
Is the TLC0820AIDW pin-compatible with the National Semiconductor ADC0820C?
Yes, the TLC0820AIDW is explicitly designated as a direct replacement for the National Semiconductor ADC0820C/CC, with identical SOIC-20 (DW) pinout, signal definitions, and electrical interface behavior. TI's datasheet states "TLC0820A Is Direct Replacement for National Semiconductor ADC0820C/CC", and all terminal functions-including WR/RDY dual-role operation, MODE-selectable timing, and OFLW functionality-match. However, the TLC0820AIDW extends temperature range to –40°C to +85°C and improves conversion speed (2.5 µs vs. 3.0 µs typical for ADC0820CC).
TLC0820AIDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 392k
- 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:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 4.5V ~ 8V
- Voltage - Supply, Digital:
- 4.5V ~ 8V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC0820AIDW FAQ
1.How can I place an order for TLC0820AIDW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC0820AIDW 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 TLC0820AIDW reliable?
The price and inventory of TLC0820AIDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC0820AIDW is usually 5 days.
3.What payment methods are accepted for TLC0820AIDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC0820AIDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC0820AIDW?
TLC0820AIDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC0820AIDW 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 TLC0820AIDW?
For technical support, including TLC0820AIDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC0820AIDW requirements.
6.How does Aetrix verify that TLC0820AIDW is sourced from the original manufacturer or authorized distributors?
All TLC0820AIDW 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 TLC0820AIDW meets industry standards.
7.What is the process for return or replacement of TLC0820AIDW?
All TLC0820AIDW units undergo pre-shipment inspection (PSI). If there is an issue with TLC0820AIDW, 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 TLC0820AIDW part is unused and in its original packaging.
Return procedure for TLC0820AIDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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