ADC0809CCN/NOPB - 8-Bit 8-Ch µP-Compatible A/D Converter DIP-28
MPN: ADC0809CCN/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.46 | $6.46 |
| 10 | $5.81 | $58.10 |
| 100 | $4.95 | $495.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.55 | $3,550.00 |
ADC0809CCN/NOPB Overview
An ADC (analog-to-digital converter) is an integrated circuit that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or logic circuits. The ADC0809 family belongs to the successive-approximation ADC (SAR ADC) category, which uses an internal DAC and comparator to perform a binary search against the input voltage each conversion cycle. Within the broader power-management and data-acquisition hierarchy, the ADC0809 sits at the bridge between analog sensors and digital control systems, often paired with op-amps for signal conditioning and voltage references for absolute accuracy.
Key features include 8 single-ended input channels selected via three address lines (A, B, C) and an address-latch enable, on-chip +5 V reference scaling for the analog comparator, easy interface to most 8-bit microprocessors via standard control signals (START, EOC, OE, ALE), low power dissipation of approximately 15 mW, and ±½ LSB and ±1 LSB linearity grades. The dual-supply topology (VCC analog and VDD digital) reduces digital switching noise coupling into the analog conversion path.
The ADC0809 uses CMOS switching logic and an internal ladder-network DAC, with a successive-approximation register clocked by an external RC or external clock. Conversion completes in approximately 100 µs, and the EOC (End of Conversion) output signals completion to the host processor. Its TTL-compatible bus interface enables direct connection to 8080, 8085, Z80, and similar legacy microprocessor buses without external glue logic.
Typical applications include data-acquisition front-ends, process-control instrumentation, industrial PLC analog input modules, panel-meter and digital-multimeter designs, and legacy 8-bit microcontroller-based sensor interfaces. The wide analog input span (0 V to VREF) and 8-channel multiplexer make it ideal for reading multiple slow-changing sensors with a single ADC resource.
When using this device, observe the dual-supply decoupling practice - place 0.1 µF ceramic capacitors close to both VCC (analog) and VDD (digital) pins, and a 10 µF tantalum bulk capacitor on each rail. Use the address-latch enable (ALE) to qualify channel selection, and gate the output enable (OE) before reading the data bus to avoid bus contention.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for ADC0809CCN/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADC0809CCN/NOPB (same form factor and footprint) — differing in Package, RoHS Status, Mounting Type, Resolution, Analog Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC0809CCN
✅ Drop-In✓ In Stock
$3.4 / Unit
View Datasheet →ADC0808CCN/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0808CCN
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0831CCN
✅ Drop-In✓ In Stock
$2.24 / Unit
View Datasheet →ADC0809CCN/NOPB Maximum Ratings & Electrical Characteristics
| Resolution | 8 bit |
| Number of Input Channels | 8 single-ended |
| Sampling Rate | 10 kSPS (typical) |
| Conversion Architecture | SAR (Successive Approximation) |
| Input Channel Type | Single-Ended |
| Data Interface | Parallel, TTL |
| Analog Supply Voltage | 4.5 V to 6 V (nominal +5 V) |
| Digital Supply Voltage | 4.5 V to 5.5 V (nominal +5 V) |
| Analog Input Voltage Range | 0 V to VREF (typically 0 to +5 V) |
| Conversion Time | approximately 100 µs |
| Power Dissipation | approximately 15 mW |
| Operating Temperature | -40 °C to +85 °C |
| Package | 28-pin PDIP (N) through-hole |
| Mounting Type | Through-Hole (DIP) |
| Reference Voltage | +5 V on-chip (or external) |
| Output Type | 3-state TTL parallel bus |
| RoHS Status | Compliant (NOPB suffix) |
| Lead-Free | Yes |
ADC0809CCN/NOPB Pin Configuration
| Pin 1 | IN1 — Analog input channel 1 |
| Pin 2 | IN2 — Analog input channel 2 |
| Pin 3 | IN3 — Analog input channel 3 |
| Pin 4 | IN4 — Analog input channel 4 |
| Pin 5 | IN5 — Analog input channel 5 |
| Pin 6 | START — Start conversion (active high pulse) |
| Pin 7 | EOC — End of conversion (active low output flag) |
| Pin 8 | IN6 — Analog input channel 6 |
| Pin 9 | OE — Output enable (active high, enables 3-state outputs) |
| Pin 10 | GND — Analog ground |
| Pin 11 | VCC — Analog supply (+5 V nominal) |
| Pin 12 | VREF+ — Reference voltage positive input |
| Pin 13 | VREF- — Reference voltage negative input (typically GND) |
| Pin 14 | AGND — Analog ground (return for VREF) |
| Pin 15 | D7 — Data bit 7 (MSB) |
| Pin 16 | D6 — Data bit 6 |
| Pin 17 | D5 — Data bit 5 |
| Pin 18 | D4 — Data bit 4 |
| Pin 19 | D3 — Data bit 3 |
| Pin 20 | D2 — Data bit 2 |
| Pin 21 | D1 — Data bit 1 |
| Pin 22 | ALE — Address latch enable (latches A, B, C) |
| Pin 23 | A — Channel address bit A (LSB) |
| Pin 24 | B — Channel address bit B |
| Pin 25 | C — Channel address bit C (MSB) |
| Pin 26 | IN7 — Analog input channel 7 |
| Pin 27 | IN0 — Analog input channel 0 |
| Pin 28 | D0 — Data bit 0 (LSB) |
Typical Applications
ADC0809CCN/NOPB is suitable for 6 applications: Multi-Sensor Data-Acquisition Front-End, Industrial PLC Analog Input Module, Digital Panel Meter and DMM, Legacy 8-bit Microprocessor Sensor Interface, Process Control Instrumentation, Educational / Hobby Electronics Trainer.
Multi-Sensor Data-Acquisition Front-End
The ADC0809CCN/NOPB's 8 single-ended input channels and on-chip multiplexer let a single IC digitize up to 8 analog sensor outputs - temperature, pressure, level, and flow transducers - in sequence. Its 10 kSPS throughput is more than adequate for slow-changing process variables (sub-100 Hz signal content), and the parallel 8-bit output streams directly into legacy 8051/PIC/Z80 microcontrollers. Place 0.1 µF ceramic bypass caps on both VCC and VDD within 5 mm of the IC pins, and gate OE before each bus read to prevent bus contention. The ±1 LSB linearity makes the part suitable for 8-bit industrial monitoring rather than laboratory instrumentation.
Recommended
Industrial PLC Analog Input Module
Programmable logic controllers routinely accept 4–20 mA or 0–10 V analog signals from field instruments, and the ADC0809CCN/NOPB is well-suited to digitize up to 8 such channels per module. Its dual ±5 V analog/digital supplies reduce switching transients coupling into the conversion path, while the TTL-compatible 3-state bus directly interfaces to PLC backplane logic. Channel selection via three address lines simplifies input-scan firmware, and the EOC flag provides a deterministic handshake for the host CPU. For harsh factory environments the through-hole PDIP package offers stronger lead compliance than SOTL.
Recommended
Digital Panel Meter and DMM
Handheld digital multimeters and panel meters using 8-bit displays benefit from the ADC0809CCN/NOPB's low cost and simple MCU interface. The 8-bit resolution is sufficient for ±0.5% full-scale meter readings, and the +5 V reference on-chip eliminates an external reference component. Voltage-divider or current-shunt signal conditioning feeds the IN0–IN7 inputs, and the host MCU controls channel switching through the address latch. The legacy parallel interface simplifies hand-prototyping and breadboarding, and the wide -40 °C to +85 °C operating range covers most consumer test equipment.
Recommended
Legacy 8-bit Microprocessor Sensor Interface
8080/8085/Z80-based industrial boards can attach the ADC0809CCN/NOPB directly through the parallel data bus with minimal glue logic. START, ALE, and OE signals align with the host CPU's read/write strobes, and the 3-state outputs share the data bus without external latches. This makes the part ideal for retrofitting older control boards, maintaining long-life industrial equipment, and educational labs that still use vintage CPUs. The 28-pin PDIP also survives repeated insertion cycles in development sockets better than fine-pitch SOTL alternatives.
Recommended
Process Control Instrumentation
Closed-loop process controllers reading temperature, pressure, and level transmitters benefit from the ADC0809CCN/NOPB's eight-channel multiplexer: one IC scans an entire rack of 0–5 V sensor outputs without external analog switching. The successive-approximation core delivers deterministic 100 µs conversion time suitable for PID update rates of 100 Hz. Dual-supply rails isolate the analog front-end from digital noise on the controller backplane, and the TTL bus connects cleanly to the controller's CPU. For higher-precision loops a 12-bit upgrade such as AD7862 or AD7893 maintains the same 28-DIP footprint.
Recommended
Educational / Hobby Electronics Trainer
The ADC0809CCN/NOPB is a classic teaching vehicle for SAR-ADC theory, multiplexer operation, and parallel microprocessor interfacing. Breadboard-friendly 28-pin PDIP, single supply operation, and clearly documented address latch, START, EOC, and OE signals let students observe each conversion phase on an oscilloscope. Many university curricula pair the part with the 8085 or Z80 trainer kit. Its legacy status keeps pricing low, and the abundance of available application notes and reference designs in the TI ADC0809 datasheet shortens learning curves.
Recommended
Recommended Products Summary
Engineering reference data for ADC0809CCN/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC0809CCN | ADC0808CCN/NOPB | ADC0808CCN | ADC0831CCN |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-pin PDIP (N) | 28-pin PDIP (N) - same | 28-pin PDIP (N) - same | 28-pin PDIP (N) - same | 28-pin PDIP (N) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 1 single-ended |
| Data Interface | Parallel TTL | Parallel TTL | Parallel TTL | Parallel TTL | Serial |
| Architecture | SAR, 8-ch mux | SAR, 8-ch mux | SAR, 8-ch mux | SAR, 8-ch mux | SAR, 1-ch (no mux) |
Key Differentiators
- Industry-standard 8-channel SAR ADC with on-chip address-latch multiplexer (vs ADC0831CCN)
- Mature legacy product with abundant inventory and design references (vs ADC0808CCN/NOPB)
- Drop-in pin-compatible with 8080/8085/Z80 microprocessor data buses (vs Modern SPI/I²C SAR ADCs (AD7992, ADS7822))
Design Notes
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VCC pin (analog supply) and another 0.1 µF ceramic within 5 mm of the VDD pin (digital supply). Add a 10 µF tantalum or electrolytic bulk capacitor on each rail. The dual-supply topology exists specifically to isolate digital switching noise from the analog conversion path; do not tie VCC and VDD together externally - separate analog and digital grounds should also be kept distinct except at a single star point near the IC.
Estimated: for a 2-layer board, route VCC and VDD power traces at least 5 mm apart from each other and from any digital clock or address-line trace to minimize capacitive coupling into the analog reference ladder. Keep analog input traces (IN0–IN7) short and surrounded by a ground pour on the same layer to limit common-mode pickup. If you must cross analog and digital traces, do so at 90° angles. Mount the IC on a socket only if you need firmware-replaceable parts, since socket contact resistance can degrade the on-chip reference by tens of millivolts.
Three common pitfalls: (1) Forgetting to assert ALE before changing A/B/C - the multiplexer latches the previous address, causing wrong-channel readings; (2) Leaving OE permanently asserted - the 3-state outputs will fight the system data bus during writes, causing excessive current and possible bus latch-up; (3) Driving analog inputs beyond VREF+ or below VREF− - the input ESD structures clamp and inject non-linear charge into the sample-and-hold. Always gate OE only during the read cycle, latch addresses on every ALE, and clamp analog inputs with external protection diodes if over-voltage is possible.
For best 8-bit accuracy, source-impedance the analog inputs at <10 kΩ; higher source impedance combined with the ADC's input sampling charge can cause gain error and channel-to-channel crosstalk. Add a 0.1 µF bypass capacitor at each analog input pin if the source impedance exceeds ~5 kΩ. The on-chip reference ladder draws current transients during conversion - add a 1 µF bypass from VREF+ to GND as close to the IC as possible to keep VREF stable within 1 LSB across all eight channels.
Compliance Information
RoHS compliance indicated by NOPB suffix per verified DigiKey and TI product listings. Not AEC-Q100 qualified - the ADC0809CCN/NOPB is intended for industrial and consumer data-acquisition, not automotive safety-critical applications.
