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Texas Instruments ADC0820CCWM/NOPB
- Part No.:
- ADC0820CCWM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADC0820CCWM/NOPB.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
ADC0820CCWM/NOPB from Texas Instruments is an 8-bit CMOS analog-to-digital converter with integrated track-and-hold, designed for high-speed µP interfacing in embedded data acquisition systems. It delivers 1.5 µs conversion time in WR-RD mode, ±1 LSB total unadjusted error, 0 V to 5 V analog input range on single 5 V supply, and latched TRI-STATE outputs - enabling direct connection to 8080/8085/Z80-style microprocessor buses without external logic.
For engineers reviewing the ADC0820CCWM/NOPB datasheet, ADC0820CCWM/NOPB pinout, ADC0820CCWM/NOPB application, or ADC0820CCWM/NOPB equivalent, key selection considerations include its half-flash architecture, ratiometric reference flexibility (VREF(−) to VREF(+)), overflow output for cascading, and dual interface modes (RD-only vs. WR-RD) supporting both interrupt-driven and timing-critical real-time sampling.
Technical Context
The ADC0820CCWM/NOPB implements a two-stage half-flash architecture: a 4-bit most-significant-bit (MSB) flash ADC drives an internal DAC that generates a reconstructed analog voltage; the residual difference is converted by a second 4-bit least-significant-bit (LSB) flash ADC. This achieves 8-bit resolution with only 32 comparators and eliminates need for external sample-and-hold for signals ≤100 mV/µs.
It supports two synchronous digital interface modes selected via the MODE pin: RD Mode (conversion initiated and data read on RD falling edge) and WR-RD Mode (WR starts conversion, RD reads result, with optional early-read capability at ≥600 ns). Both modes provide latched TRI-STATE outputs, INT flag, RDY status, and OFL overflow indication - all compliant with MOS/TTL voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - guarantees monotonic transfer function with no missing codes across full operating temperature range. |
| Conversion Time | 1.5 µs max (WR-RD mode) - enables up to 667 kSPS sustained sampling without pipeline latency or external timing control. |
| Total Unadjusted Error | ±1 LSB - includes offset, full-scale, and linearity errors; ensures accuracy without zero/full-scale calibration in most applications. |
| Analog Input Range | 0 V to 5 V with single 5 V supply - supports direct connection to sensors, op-amp outputs, or ratiometric transducer bridges. |
| Reference Flexibility | VREF(−) to VREF(+) differential range ≤ VCC - allows programmable span (e.g., 2.5 V reference yields 9.8 mV/LSB) and offset (e.g., VREF(−) = 1 V sets zero code at 1 V). |
| Power Dissipation | 75 mW max at 5 V - enables use in thermally constrained industrial modules and battery-backed instrumentation. |
| Digital Interface | µP-compatible 8-bit parallel bus with CS, WR, RD, INT, RDY, OFL, and MODE - requires no glue logic for 8080/8085/Z80 or compatible controllers. |
Pinout & Package
ADC0820CCWM/NOPB is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.3-inch body width and standard JEDEC MS-013 footprint. Pin 19 (NC) is not internally connected; all other pins are electrically active per functional description.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Analog input | Accepts 0 V to VCC signal; sampled simultaneously by MS and LS flash stages during WR low or RD start - provides inherent sample-and-hold for ≤100 mV/µs inputs. |
| DB0–DB7 (Pins 2–5, 14–17) | TRI-STATE digital output bus | Latched 8-bit parallel data (LSB to MSB); high-impedance when CS high or RD inactive - enables bus sharing with other peripherals. |
| WR / RDY (Pin 6) | Mode-shared control/status | In WR-RD mode: WR initiates conversion on falling edge; in RD mode: RDY goes low after CS fall and tri-states upon data latch - simplifies handshaking. |
| MODE (Pin 7) | Interface mode select | Low = RD Mode (single-cycle conversion); high = WR-RD Mode (asynchronous start/read) - determines timing sequence and INT behavior. |
| RD (Pin 8) | Data strobe / enable | In RD Mode: starts conversion and enables DB0–DB7; in WR-RD Mode: reads latched result early (≥600 ns) or waits for INT - supports flexible µP timing budgets. |
| INT (Pin 9) | Interrupt request | Active-low open-drain flag indicating conversion completion; reset by rising edge of RD or CS - enables interrupt-driven data capture in real-time systems. |
| OFL (Pin 18) | Overflow indicator | Active-low output asserted when VIN > VREF(+); used to cascade multiple ADC0820CCWM/NOPB devices for 9+ bit resolution without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold function | Eliminates need for external S/H circuitry for input slew rates ≤100 mV/µs - reduces BOM count and board area in data loggers and sensor interfaces. |
| Half-flash conversion architecture | Uses 32 comparators and dual 4-bit flash stages to achieve 8-bit resolution at 1.5 µs - balances speed, power (75 mW), and silicon area more efficiently than full-flash or SAR. |
| Ratiometric or independent reference support | VREF(−) and VREF(+) accept any differential voltage ≤ VCC - enables direct use of sensor excitation supply as reference, improving noise rejection in bridge-based measurements. |
| µP-compatible parallel interface | No external clock or timing logic required; meets MOS/TTL voltage thresholds and provides CS/WR/RD handshaking - integrates seamlessly with legacy 8-bit microcontrollers. |
| Overflow output for resolution extension | OFL pin enables daisy-chaining of two ADC0820CCWM/NOPB units to implement 9-bit conversion - avoids redesign when higher resolution is needed post-production. |
Applications
| Industrial Data Acquisition | Telecom Signal Monitoring |
|---|---|
|
Use Scenario: Digitizing analog sensor outputs (temperature, pressure, current) in PLC I/O modules operating at ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Primary A/D converter providing 8-bit resolution and 1.5 µs conversion for real-time loop control with deterministic µP response. Use Value: Single-supply 5 V operation and no calibration requirement reduce system cost; built-in track-and-hold handles transducer settling without added components. |
Use Scenario: Monitoring line voltage, signal amplitude, and clipping indicators in voice-band telecom front-ends (e.g., FXS/FXO interfaces). IC Role / Device Role / Timing Role: High-speed analog monitor capturing peak envelope or DC bias levels with minimal latency between analog event and µP alert. Use Value: OFL output flags overvoltage conditions immediately; WR-RD mode allows sub-microsecond response to transient faults without interrupt latency. |
| Embedded Instrumentation | Multi-Channel Sensor Hub |
|
Use Scenario: Portable multimeter or handheld test equipment requiring low-power, self-contained A/D with direct µP interface. IC Role / Device Role / Timing Role: Stand-alone A/D converter operated with CS and RD tied low, triggered by WR pulses - minimizes firmware overhead. Use Value: 75 mW max power enables battery operation; ratiometric reference support improves accuracy when using same supply for sensor excitation and ADC reference. |
Use Scenario: Aggregating analog readings from multiple RTDs, thermocouples, or strain gauges using multiplexed input switching. IC Role / Device Role / Timing Role: Core A/D engine shared across channels via analog MUX; RDY/INT signals coordinate µP readout timing per channel. Use Value: TRI-STATE outputs prevent bus contention during channel switching; fast 1.5 µs conversion enables high aggregate sampling rate across 4–8 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC0804LCN/NOPB | Successive approximation (SAR) architecture; 100 µs conversion time; no built-in track-and-hold; requires external clock. | Lower speed, higher power per conversion; suited for slower, lower-cost systems where timing determinism is less critical. | Select ADC0804LCN/NOPB when cost sensitivity outweighs speed requirements and external clock generation is acceptable. |
| MAX1112CPE+ | 12-bit SAR ADC; SPI interface; 2.7–5.25 V supply; built-in reference; 10 µs conversion time. | Higher resolution and serial interface reduce pin count but require µP SPI peripheral and software driver support. | Select MAX1112CPE+ when resolution >8 bits is mandatory and system design accommodates serial interface and tighter supply regulation. |
Compared with ADC0804LCN/NOPB and MAX1112CPE+, the ADC0820CCWM/NOPB uniquely combines µP-compatible parallel timing, sub-microsecond conversion, and integrated track-and-hold - making it optimal for legacy 8-bit microcontroller systems demanding real-time analog monitoring without layout or firmware redesign.
Availability
ADC0820CCWM/NOPB is available at Aetrix Electronics and suitable for industrial data acquisition, telecom signal monitoring, and embedded instrumentation requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for ADC0820CCWM/NOPB 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 high-reliability ICs for industrial, automotive, and communications markets.
The ADC0820CCWM/NOPB belongs to TI's legacy high-speed parallel ADC product line, engineered for µP-centric data acquisition systems where deterministic timing, minimal external components, and compatibility with 8-bit bus architectures are primary design constraints.
FAQ
What is the maximum analog input slew rate supported by the ADC0820CCWM/NOPB without external sample-and-hold?
The ADC0820CCWM/NOPB supports analog input slew rates up to 100 mV/µs without external sample-and-hold due to its inherent sampled-data comparator architecture and simultaneous sampling of VIN by both MS and LS flash stages. This is confirmed in the Functional Description section of the SNAS529C datasheet, which states that input signals ≤100 mV/µs can be converted without error. The ADC0820CCWM/NOPB achieves this through precise timing alignment of zeroing and compare phases across its dual 4-bit converters.
Does the ADC0820CCWM/NOPB require an external clock source?
No, the ADC0820CCWM/NOPB does not require an external clock source. Its half-flash conversion is internally timed: WR-RD mode uses a preset internal timeout (~800 ns) for MS flash completion, and RD mode triggers comparator phases directly from RD edge timing. All timing parameters - including tCRD (2.5 µs max), tCWR-RD (1.5 µs max), and tI (internal comparison time) - are self-contained within the ADC0820CCWM/NOPB die, eliminating need for external oscillators or clock distribution.
How does the OFL pin function in the ADC0820CCWM/NOPB, and what is its practical use case?
The OFL (Overflow) pin on the ADC0820CCWM/NOPB is an active-low, always-enabled output that asserts when VIN exceeds VREF(+). Its primary use is cascading two ADC0820CCWM/NOPB devices to construct a 9-bit converter: the OFL of the first device controls the enable of the second, allowing MSB extension. This is explicitly documented in the PIN DESCRIPTIONS and TYPICAL APPLICATIONS sections of the datasheet, and enables resolution upgrades without PCB redesign or additional logic ICs.
Can the ADC0820CCWM/NOPB operate with a reference voltage less than 5 V, and how does that affect LSB size?
Yes, the ADC0820CCWM/NOPB supports ratiometric operation with VREF(+) − VREF(−) as low as 1.00 kΩ minimum reference resistance and down to 1.2 V typical minimum reference voltage. When VREF = 2.5 V, 1 LSB equals 9.77 mV (2.5 V / 256); at VREF = 1.2 V, 1 LSB = 4.69 mV. This scaling is linear and fully supported per the CONVERTER CHARACTERISTICS table in the datasheet, enabling improved resolution for low-voltage sensor outputs without external amplification.
What are the absolute maximum ratings for supply voltage and operating temperature of the ADC0820CCWM/NOPB?
The ADC0820CCWM/NOPB has an absolute maximum supply voltage (VCC) of 10 V and a storage temperature range of −65°C to +150°C. Its specified operating temperature range is 0°C to +70°C, as indicated by the "CC" grade suffix in ADC0820CCWM/NOPB - matching the ADC0820CCN and ADC0820CCWM part numbers listed under Operating Ratings in the SNAS529C datasheet. Exceeding these limits may cause permanent damage.
ADC0820CCWM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential, 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:
- -
ADC0820CCWM/NOPB FAQ
1.How can I place an order for ADC0820CCWM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC0820CCWM/NOPB 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 ADC0820CCWM/NOPB reliable?
The price and inventory of ADC0820CCWM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC0820CCWM/NOPB is usually 5 days.
3.What payment methods are accepted for ADC0820CCWM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC0820CCWM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC0820CCWM/NOPB?
ADC0820CCWM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC0820CCWM/NOPB 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 ADC0820CCWM/NOPB?
For technical support, including ADC0820CCWM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC0820CCWM/NOPB requirements.
6.How does Aetrix verify that ADC0820CCWM/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC0820CCWM/NOPB 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 ADC0820CCWM/NOPB meets industry standards.
7.What is the process for return or replacement of ADC0820CCWM/NOPB?
All ADC0820CCWM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC0820CCWM/NOPB, 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 ADC0820CCWM/NOPB part is unused and in its original packaging.
Return procedure for ADC0820CCWM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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