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Texas Instruments TLC0820ACDWG4
- Part No.:
- TLC0820ACDWG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC0820ACDWG4.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
TLC0820ACDWG4 from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring 1.18 µs conversion time, differential reference inputs, parallel microprocessor interface, on-chip track-and-hold, and single 5-V supply operation - deployed in high-speed data acquisition systems for industrial instrumentation and real-time control.
For engineers reviewing the TLC0820ACDWG4 datasheet, TLC0820ACDWG4 pinout, TLC0820ACDWG4 application, or TLC0820ACDWG4 equivalent, this page delivers verified electrical specs, mode-select timing behavior, TTL-compatible 3-state outputs, overflow flag functionality for cascaded resolution extension, and direct replacement guidance for legacy ADC0820C/CC and AD7820K/B/T designs.
Technical Context
The TLC0820ACDWG4 implements a two-stage modified flash architecture: dual 4-bit flash ADCs (MSB and LSB banks) with an on-chip 4-bit DAC and summing amplifier to resolve full 8-bit output. Its internal timing logic supports two distinct operational modes - read-only (MODE low) and write-read (MODE high) - each with dedicated signal protocols for WR/RDY (ready/write), RD (read strobe), and INT (conversion-complete interrupt).
It uses differential reference inputs (REF+ and REF–) defining full-scale range, enabling ratiometric conversion by adjusting reference voltage levels. The on-chip track-and-hold provides a 100-ns sample window and supports analog input slew rates up to 100 mV/µs without external components, ensuring accurate digitization of fast-changing signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes for precise quantization of analog sensor or signal chain outputs. |
| Conversion Time | 1.18 µs max - enables sampling rates up to ~847 kSPS in write-read mode, suitable for medium-speed real-time monitoring. |
| Reference Inputs | Differential (REF+, REF–) - allows flexible full-scale adjustment and ratiometric measurement against system supply or sensor excitation. |
| Supply Voltage | Single 5 V (4.5–5.25 V) - simplifies power design by eliminating dual-rail or precision reference generation requirements. |
| Output Interface | Parallel TTL-compatible 3-state bus (D0–D7) - directly interfaces with 8-bit microcontrollers and FPGAs without level-shifting circuitry. |
| Total Unadjusted Error | ±1 LSB over temperature - ensures monotonicity and predictable code transition behavior across 0°C to 70°C operating range. |
| Track-and-Hold | On-chip, 100-ns aperture - captures transient analog events without external sample-hold ICs or timing-critical external clocking. |
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 lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANLG IN (Pin 1) | Analog input | Primary signal input node; accepts –0.1 V to VCC+0.1 V range with 45 pF input capacitance. |
| CS (Pin 13) | Chip select | Active-low enable for RD/WR recognition; must be low before initiating any data transfer sequence. |
| D0–D7 (Pins 2–5, 14–17) | Digital outputs | 8-bit parallel TTL-compatible 3-state data bus; D0 = LSB, D7 = MSB; 5 pF output capacitance. |
| WR/RDY (Pin 6) | Mode-dependent I/O | In write-read mode: falling edge initiates conversion; in read mode: open-drain ready indicator. |
| MODE (Pin 7) | Operation mode select | Low = read-only mode; high = write-read mode; internally pulled down via 50-µA current source. |
| RD (Pin 8) | Read strobe | Falling edge latches conversion result into output latch and activates D0–D7 drivers in both modes. |
| INT (Pin 9) | Interrupt output | Active-low pulse indicating conversion completion; delay from WR↑ to INT↓ is 800–1300 ns in write-read mode. |
| GND (Pin 10) | Ground reference | Analog and digital ground common return; requires low-impedance PCB connection for noise immunity. |
| REF– (Pin 11), REF+ (Pin 12) | Differential reference | Define full-scale span; support common-mode range from GND to VCC; 1.25–6 kΩ reference resistance. |
| OFLW (Pin 18) | Overflow flag | Active-low when ANLG IN exceeds REF+; used to cascade multiple TLC0820A devices for >8-bit resolution. |
| VCC (Pin 20) | Power supply | 5-V nominal supply; draws 7.5–13 mA typical current; decoupling with 0.1 µF ceramic required at pin. |
| NC (Pin 19) | No internal connection | Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Modified flash conversion architecture | Combines two 4-bit flash stages with on-chip DAC and error amplifier to achieve 8-bit accuracy at 1.18 µs speed with low power. |
| On-chip track-and-hold | Eliminates need for external sample-hold circuitry while supporting 100 mV/µs analog slew rates and 100-ns aperture. |
| Dual operational modes | Hardware-selectable read-only (MODE low) and write-read (MODE high) modes simplify integration with diverse microprocessor buses. |
| Overflow flag (OFLW) | Enables cascading of two or more TLC0820A units to construct 9-bit or 10-bit converters without external logic. |
| Direct replacement capability | PIN-TO-PIN and FUNCTIONAL replacement for National Semiconductor ADC0820C/CC and Analog Devices AD7820K/B/T. |
Applications
| Industrial Data Acquisition | Real-Time Motor Control |
|---|---|
Use Scenario: Digitizing analog feedback signals (current, voltage, position) from sensors in PLC-based control cabinets operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Primary ADC capturing synchronized multi-channel analog inputs at sub-2 µs intervals to feed closed-loop PID algorithms running on embedded microcontrollers. Use Value: ±1 LSB total unadjusted error and on-chip track-and-hold ensure stable, repeatable measurements without calibration drift across 0°C–70°C ambient. | Use Scenario: Sampling motor phase currents and DC bus voltage in servo drive inverters requiring fast response to torque transients and fault conditions. IC Role / Device Role / Timing Role: High-speed analog front-end ADC interfacing directly to 8-bit MCU data bus via parallel TTL outputs and RD/WR handshaking. Use Value: 1.18 µs conversion time enables ≥800 kSPS sampling, sufficient to reconstruct 10 kHz current waveforms per Nyquist criterion. |
| Legacy System Upgrades | Test & Measurement Equipment |
Use Scenario: Replacing obsolete ADC0820C/CC or AD7820K/B/T in field-deployed instrumentation where board layout cannot be modified. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement preserving existing PCB footprint, timing margins, and firmware register access sequences. Use Value: Identical SOIC-20 DW package, matching pinout, and compatible MODE/WR/RDY/INT timing eliminates redesign and requalification effort. | Use Scenario: Building portable handheld multimeters or oscilloscope front-ends needing compact, self-contained ADC subsystems with minimal external components. IC Role / Device Role / Timing Role: Standalone ADC with integrated track-and-hold and differential references - reduces BOM count and PCB area versus discrete ADC + TH + reference solutions. Use Value: Single 5-V supply, no external clock or oscillator, and 0.1 µF local decoupling only meet stringent size and power constraints of battery-operated test gear. |
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 8-bit modified flash architecture, identical pinout and timing, but manufactured by National Semiconductor (now TI); slightly higher max supply voltage (6.5 V). | Legacy industrial modules originally designed for National parts; may require validation of VCC derating if operating near 6 V. | Select when maintaining exact historical BOM lineage or sourcing from legacy distributor stock. |
| AD7820KN | Analog Devices variant with same 8-bit resolution and parallel interface, but uses different internal architecture (half-flash); 2.5 µs conversion time vs. 1.18 µs. | Lower-speed applications where 400 kSPS suffices; not suitable for time-critical loops requiring <2 µs latency. | Select when prioritizing second-source availability over maximum throughput, or when interfacing with older ADI-compatible firmware. |
Compared with ADC0820CCN and AD7820KN, the TLC0820ACDWG4 delivers the fastest conversion (1.18 µs), lowest power consumption (7.5 mA typ), and most robust noise immunity due to Advanced LinCMOS™ process - making it optimal for new designs demanding speed, stability, and long-term supply continuity.
Availability
TLC0820ACDWG4 is available at Aetrix Electronics and suitable for industrial data acquisition, real-time motor control, and legacy system upgrades requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC0820ACDWG4 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 experience in precision data conversion and industrial-grade IC design.
The TLC0820A product line was engineered for high-speed, low-power 8-bit digitization in resource-constrained embedded systems - targeting instrumentation, motor drives, and upgrade paths for legacy ADC designs where reliability and pin compatibility are critical.
FAQ
What is the maximum operating temperature range for the TLC0820ACDWG4?
The TLC0820ACDWG4 is rated for operation from 0°C to 70°C ambient temperature, as confirmed by its "AC" suffix designation and the Absolute Maximum Ratings table in the SLAS064A datasheet. This commercial-grade temperature range aligns with its intended use in industrial control panels and non-automotive instrumentation environments where thermal management is controlled.
Does the TLC0820ACDWG4 require an external clock or oscillator?
No, the TLC0820ACDWG4 does not require an external clock or oscillator. Its modified flash architecture uses fully internal timing generation, with conversion initiated by WR/RDY or RD edges depending on MODE setting. This eliminates external timing components and reduces system-level jitter sensitivity - a key advantage over successive-approximation or sigma-delta ADCs.
How does the OFLW pin function in the TLC0820ACDWG4?
The OFLW (overflow) pin on the TLC0820ACDWG4 is an active-low flag that asserts when the analog input voltage exceeds the REF+ reference level. It is used to cascade multiple TLC0820ACDWG4 devices - for example, connecting OFLW of one unit to MODE or CS of another - enabling 9-bit or 10-bit resolution without external logic, as shown in Figure 6 of the datasheet.
Can the TLC0820ACDWG4 interface directly with a 3.3-V microcontroller?
The TLC0820ACDWG4 outputs are TTL-compatible with VOH ≥ 2.4 V at IOH = –360 µA and VOL ≤ 0.4 V at IOL = 1.6 mA under 5-V supply, meeting standard 5-V TTL logic thresholds. Direct connection to a 3.3-V MCU is not recommended without level translation, as its inputs may exceed 3.3-V absolute maximum ratings; use a bidirectional level shifter or buffer for safe interfacing.
What is the purpose of the MODE pin on the TLC0820ACDWG4?
The MODE pin selects between two hardware-defined operational modes: when pulled low (internally biased via 50-µA current source), the TLC0820ACDWG4 operates in read-only mode where RD falling edge starts conversion; when driven high, it enters write-read mode where WR/RDY falling edge initiates conversion and INT signals completion after ~800 ns. This dual-mode flexibility simplifies integration across varied processor architectures.
TLC0820ACDWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
TLC0820ACDWG4 FAQ
1.How can I place an order for TLC0820ACDWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC0820ACDWG4 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 TLC0820ACDWG4 reliable?
The price and inventory of TLC0820ACDWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC0820ACDWG4 is usually 5 days.
3.What payment methods are accepted for TLC0820ACDWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC0820ACDWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC0820ACDWG4?
TLC0820ACDWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC0820ACDWG4 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 TLC0820ACDWG4?
For technical support, including TLC0820ACDWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC0820ACDWG4 requirements.
6.How does Aetrix verify that TLC0820ACDWG4 is sourced from the original manufacturer or authorized distributors?
All TLC0820ACDWG4 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 TLC0820ACDWG4 meets industry standards.
7.What is the process for return or replacement of TLC0820ACDWG4?
All TLC0820ACDWG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC0820ACDWG4, 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 TLC0820ACDWG4 part is unused and in its original packaging.
Return procedure for TLC0820ACDWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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