Part A
ADC0809CCN
Texas Instruments
- Lifecycle
- Active
- Stock
- 5334 Stückzahl
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADC0809CCN and ADC0831CCN are not functionally interchangeable despite sharing the same 28-pin DIP footprint and 5 V supply. The ADC0809CCN is an 8-channel, 8-bit successive-approximation ADC with a parallel microprocessor interface, while the ADC0831CCN is a single-channel, 8-bit ADC with a serial (Microwire/SPI-compatible) interface. The differences in channel count, output interface, and conversion architecture require board-level redesign, firmware changes, and revalidation before substitution can be considered.
Different channel count
Different output interface
Different conversion architecture
Different control logic
Parts at a glance
Part B
ADC0831CCN
Texas Instruments
- Lifecycle
- Active
- Stock
- 7875 Stückzahl
- Package
- DIP-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADC0809CCN | ADC0831CCN | Why it matters |
|---|---|---|---|
| Resolution | 8 bits | 8 bits | Both provide 8-bit resolution, so quantization step size is comparable for a given reference voltage. |
| Number of Input Channels | 8 single-ended (multiplexed) | 1 single-ended (differential capable) | The ADC0809 can scan multiple analog sources, while the ADC0831 handles only one channel, affecting system architecture and external multiplexing needs. |
| Conversion Architecture | Successive approximation | Successive approximation | Both use SAR conversion, giving similar speed/accuracy tradeoffs and similar external component requirements. |
| Interface Type | Parallel (8-bit data bus) | Serial (SPI-compatible, 3-wire) | Parallel vs serial interface fundamentally changes the host connection, pin count, and firmware, so they are not drop-in substitutes. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, so power rail compatibility is maintained in legacy 5 V systems. |
| Conversion Time | ~100 µs (at 640 kHz clock) | ~32 µs (at 250 kHz clock) | Faster conversion allows higher sample rates; the ADC0831 is roughly three times faster per conversion. |
| Package | 28-pin DIP | 8-pin DIP | Different pin counts and footprints mean the boards are not physically interchangeable without redesign. |
| Reference Input | External reference (VREF+/VREF-) | External reference (VREF) | Both require an external reference, so accuracy and input range depend on the reference circuit in either case. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | Identical commercial temperature ratings mean both suit the same benign environments but neither is suited to industrial extremes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0809CCN | ADC0831CCN |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Sampling Rate(Per Second) | - | 31.25k |
| Number of Inputs | 8 | 1 |
| Input Type | Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | Parallel | SPI |
| Configuration | MUX-S/H-ADC | MUX-ADC |
| Number of A/D Converters | - | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 4.5V ~ 6.5V | 4.5V ~ 6.3V |
| Voltage - Supply, Digital | 4.5V ~ 6.5V | 4.5V ~ 6.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Base Product Number | ADC0809 | - |
| Sampling Rate (Per Second) | 10k | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Through Hole | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key architectural differences between the ADC0809CCN and ADC0831CCN?
The ADC0809CCN is an 8-channel, 8-bit successive-approximation ADC with a built-in 8-channel multiplexer and an on-chip track-and-hold, housed in a 28-pin DIP. The ADC0831CCN is a single-channel, 8-bit successive-approximation ADC with a serial (Microwire/SPI-compatible) interface, housed in an 8-pin DIP. The ADC0809 provides a parallel 8-bit data bus and multiple analog inputs, while the ADC0831 provides one differential/ single-ended input pair and serial data output.
Can the ADC0809CCN and ADC0831CCN be used as direct substitutes for each other?
No. They differ in package pin count (28-pin vs 8-pin DIP), interface type (parallel vs serial), number of analog input channels (8 vs 1), and control signal protocol. A direct drop-in replacement is not possible without redesigning the interface, PCB footprint, and control firmware.
What is the resolution and conversion time of each device?
Both devices provide 8-bit resolution. The ADC0809CCN has a typical conversion time of approximately 100 µs when clocked at 640 kHz. The ADC0831CCN has a typical conversion time of approximately 32 µs when clocked at 250 kHz. Actual timing depends on the applied clock frequency per the respective datasheets.
How do the analog input configurations differ between the two parts?
The ADC0809CCN offers 8 single-ended analog input channels selected via a 3-bit address, with an input voltage range of 0 V to VCC (typically 5 V). The ADC0831CCN provides one differential input pair (or two single-ended inputs) with a similar 0 V to VCC range, configured via the serial control word.
What supply voltage and power consumption do these ADCs require?
Both the ADC0809CCN and ADC0831CCN operate from a single 5 V supply. The ADC0809CCN typically consumes about 15 mW, while the ADC0831CCN typically consumes about 5 mW, per their manufacturer datasheets.
What interface does each device use to communicate with a microcontroller?
The ADC0809CCN uses a parallel interface with an 8-bit data bus plus control lines (START, EOC, OE, ALE, and channel address lines), requiring multiple GPIO pins. The ADC0831CCN uses a serial interface (CS, CLK, and DO) compatible with Microwire/SPI, requiring only three microcontroller pins.
Which device is better suited for multi-channel data acquisition?
The ADC0809CCN is better suited for multi-channel acquisition because it integrates an 8-channel multiplexer, allowing up to eight analog signals to be sampled by a single device. The ADC0831CCN handles only one differential input pair, so multi-channel systems would require external multiplexing or multiple ADC0831 devices.
Are the ADC0809CCN and ADC0831CCN still available and what package options exist?
Both are legacy National Semiconductor (now Texas Instruments) parts. The ADC0809CCN is supplied in a 28-pin plastic DIP (N package), and the ADC0831CCN is supplied in an 8-pin plastic DIP (N package). Availability should be confirmed with authorized distributors such as DigiKey or Mouser, as these parts are not recommended for new designs.