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Texas Instruments TLC0820ACDWR
- Part No.:
- TLC0820ACDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC0820ACDWR.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
TLC0820ACDWR from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, delivering 1.18 µs conversion time, ±1 LSB total unadjusted error, and TTL-compatible 3-state parallel output. It operates from a single 5-V supply, integrates on-chip track-and-hold with 100-ns sample window, and supports read-only and write-read modes for microprocessor interfacing in real-time data acquisition systems.
For engineers reviewing the TLC0820ACDWR datasheet, TLC0820ACDWR pinout, TLC0820ACDWR application, or TLC0820ACDWR equivalent, this page provides verified technical context, validated pin functions, confirmed timing parameters (tconv(R) ≤ 2.5 µs, ta(R) ≤ 320 ns), differential reference support (REF+/REF–), and direct replacement guidance for legacy ADC0820C/CC and AD7820K/B/T designs.
Technical Context
The TLC0820ACDWR implements a two-stage modified flash architecture: first, a 4-bit flash ADC quantizes 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 high speed without external clocking.
It features dual operational modes controlled by the MODE pin: read mode (MODE = low) initiates conversion on RD↓ and uses WR/RDY as a ready output; write-read mode (MODE = high) starts conversion on WR/RDY↓ and uses INT to signal completion after ~800 ns delay. Both modes support parallel microprocessor interface with CS, RD, and WR/RDY handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes for analog input mapping |
| Conversion Time | 1.18 µs typical, ≤2.5 µs max over temperature - enables ≥400 kSPS sustained sampling |
| Total Unadjusted Error | ±1 LSB - ensures monotonicity and guarantees no missing codes across full operating range |
| Reference Inputs | Differential REF+ and REF− - allows ratiometric scaling and full-scale adjustment via external voltage sources |
| Supply Voltage | 4.5 V to 8 V - compatible with standard 5-V logic rails and tolerant of minor rail variation |
| Track-and-Hold | On-chip, 100-ns aperture - captures signals with up to 100 mV/µs slew rate without external components |
| Output Interface | Parallel 3-state TTL-compatible D0–D7 - directly drives standard 5-V microprocessor data buses |
Pinout & Package
Package: SOIC (DW), 20-pin, 7.5 mm × 12.8 mm body, 1.27 mm 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 input referenced to differential REF+ and REF− |
| CS (Pin 13) | Chip select | Active-low enable: required low for RD or WR/RDY to be recognized |
| RD (Pin 8) | Read strobe | In write-read mode: enables 3-state outputs when low; in read mode: initiates conversion on falling edge |
| WR/RDY (Pin 6) | Write input / Ready output | Mode-dependent: write trigger in write-read mode; open-drain busy indicator in read mode |
| MODE (Pin 7) | Operation mode select | Low = read mode; high = write-read mode - internally pulled down via 50-µA current source |
| INT (Pin 9) | Interrupt output | Active-low pulse signaling end of internal count-down delay (~800 ns after WR↑) and data validity |
| OFLW (Pin 18) | Overflow flag | Active-low if ANLG IN exceeds REF+ - enables cascading for 9-/10-bit extended resolution |
| REF+ (Pin 12), REF− (Pin 11) | Differential reference inputs | Define full-scale range; common-mode range spans GND to VCC |
| D0–D7 (Pins 2–5, 14–17) | Parallel digital outputs | 3-state TTL-compatible bus outputs; D0 = LSB, D7 = MSB |
| VCC (Pin 20), GND (Pin 10) | Power supply | Single 5-V supply operation; decoupling recommended per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| No external clock required | Self-timed conversion eliminates need for oscillator circuitry or clock routing |
| Microprocessor interface modes | Configurable read-only or write-read operation simplifies integration with 8051, Z80, and 68k-family CPUs |
| Differential reference architecture | Enables ratiometric measurement and flexible gain setting via REF+ and REF− voltages |
| Overflow flag (OFLW) | Supports multi-device cascading to extend resolution beyond 8 bits without external logic |
| On-chip track-and-hold | Eliminates external sample-hold IC and associated timing complexity for high-slew-rate signals |
Applications
| Industrial Data Acquisition | Test & Measurement Equipment |
|---|---|
Use Scenario: Real-time monitoring of sensor outputs (e.g., pressure, temperature) in PLC I/O modules with 100 kHz sampling requirements. IC Role / Device Role / Timing Role: Primary 8-bit ADC performing parallel-conversion-triggered sampling synchronized to microcontroller RD/WR cycles. Use Value: 1.18 µs conversion time and 2.5 µs max access time meet deterministic scan-cycle deadlines in industrial control loops. | Use Scenario: Digitizing analog waveforms in portable oscilloscopes and multimeters requiring fast, repeatable sampling. IC Role / Device Role / Timing Role: High-speed front-end ADC capturing transient events with minimal aperture jitter due to integrated 100-ns track-and-hold. Use Value: On-chip T/H and ±1 LSB error ensure accurate amplitude fidelity without calibration overhead in field-deployed instruments. |
| Motor Control Feedback | Medical Instrumentation |
Use Scenario: Sampling current/voltage feedback signals in brushless DC motor drives operating at switching frequencies >20 kHz. IC Role / Device Role / Timing Role: Dedicated ADC for closed-loop current sensing, interfaced directly to MCU data bus via CS/RD handshake. Use Value: TTL-compatible 3-state outputs and single 5-V supply simplify PCB layout and reduce BOM count in space-constrained drive modules. | Use Scenario: Converting analog ECG or EEG signals in portable patient monitors where low power and reliability are critical. IC Role / Device Role / Timing Role: Low-noise, monotonic ADC providing trusted 8-bit digitization with guaranteed no-missing-codes performance. Use Value: ±1 LSB total unadjusted error and differential reference inputs support clinical-grade accuracy without trimming components. |
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, identical electrical specs, but obsolete National Semiconductor part with limited availability and no RoHS compliance | Legacy drop-in replacement only; lacks TI's long-term supply assurance and modern packaging | Select TLC0820ACDWR for new designs requiring active production, RoHS compliance, and TI's quality and support infrastructure |
| AD7820KN | Functionally equivalent 8-bit ADC, but uses CMOS process (not LinCMOS); slightly higher power (20 mA vs 15 mA ICC) and slower access time (400 ns vs 320 ns) | Acceptable for non-critical timing applications; not recommended for high-throughput systems requiring sub-350 ns data access | Choose TLC0820ACDWR when optimizing for speed, power efficiency, and compatibility with TI's ecosystem and documentation |
Compared with ADC0820CCN and AD7820KN, the TLC0820ACDWR offers superior conversion speed (1.18 µs), lower supply current (15 mA), guaranteed RoHS compliance, and ongoing production support-making it the preferred choice for new industrial and medical designs requiring long-term component stability.
Availability
TLC0820ACDWR is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment, and motor control applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant SOIC packaging.
Supply support for TLC0820ACDWR 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 TLC0820A series belongs to TI's legacy high-speed parallel ADC product line, designed specifically for cost-sensitive, microprocessor-based systems needing fast, reliable 8-bit digitization without external clocks or support components.
FAQ
What is the maximum operating temperature range for the TLC0820ACDWR?
The TLC0820ACDWR is rated for 0°C to 70°C ambient operation, consistent with its "C" grade suffix. This commercial temperature range is validated per TI's SLAS064A datasheet and applies to all electrical characteristics unless otherwise noted. The device is not specified for extended industrial or automotive ranges - for –40°C to 85°C operation, the TLC0820AIDWR variant must be used instead.
Does the TLC0820ACDWR require an external clock or oscillator?
No, the TLC0820ACDWR does not require an external clock or oscillator. Its modified flash architecture uses internal timing generation, enabling fully self-contained conversion. All timing - including conversion, interrupt assertion, and data latching - is derived from on-chip logic and propagation delays, eliminating clock distribution, jitter concerns, and external component dependencies.
How does the MODE pin affect the interface behavior of the TLC0820ACDWR?
The MODE pin selects between two distinct interface protocols: when low, TLC0820ACDWR operates in read mode (conversion starts on RD↓, WR/RDY acts as open-drain ready output); when high, it enters write-read mode (conversion starts on WR/RDY↓, INT signals completion). The internal 50-µA pulldown ensures default read-mode operation if left unconnected, simplifying basic implementations.
Can the TLC0820ACDWR interface directly with a 3.3-V microcontroller data bus?
No, the TLC0820ACDWR is strictly a 5-V TTL-compatible device: its outputs swing from 0.4 V (VOL) to 2.4 V (VOH) under load, and inputs require VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 5 V. Direct connection to a 3.3-V bus risks undriven high states and potential latch-up. Level-shifting circuitry or a 5-V–capable MCU is required for reliable communication.
What is the function of the OFLW pin on the TLC0820ACDWR, and how is it used?
The OFLW (overflow) pin on the TLC0820ACDWR is an active-low flag that asserts when the analog input exceeds the REF+ voltage. It is used to cascade multiple TLC0820ACDWR devices - for example, connecting OFLW of one unit to MODE or CS of another - enabling 9-bit or 10-bit resolution through hardware-based overflow chaining without additional logic gates or firmware intervention.
TLC0820ACDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC0820ACDWR FAQ
1.How can I place an order for TLC0820ACDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC0820ACDWR 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 TLC0820ACDWR reliable?
The price and inventory of TLC0820ACDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC0820ACDWR is usually 5 days.
3.What payment methods are accepted for TLC0820ACDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC0820ACDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC0820ACDWR?
TLC0820ACDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC0820ACDWR 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 TLC0820ACDWR?
For technical support, including TLC0820ACDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC0820ACDWR requirements.
6.How does Aetrix verify that TLC0820ACDWR is sourced from the original manufacturer or authorized distributors?
All TLC0820ACDWR 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 TLC0820ACDWR meets industry standards.
7.What is the process for return or replacement of TLC0820ACDWR?
All TLC0820ACDWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC0820ACDWR, 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 TLC0820ACDWR part is unused and in its original packaging.
Return procedure for TLC0820ACDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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