Part A
ADC0804LCWM
Texas Instruments
- Lifecycle
- Active
- Stock
- 2055 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADC0804LCWM and ADC08032CIWMX are not functionally interchangeable. The ADC0804LCWM is a standalone 8-bit successive-approximation ADC with an on-chip clock and parallel microprocessor interface, while the ADC08032CIWMX is a serial I/O 8-bit ADC with a different interface architecture, package, and control scheme. Designers must not substitute one for the other without a full redesign of the interface, timing, and board layout.
Different interface type
Different package
Different clock architecture
Different control logic
Parts at a glance
Part B
ADC08032CIWMX
Texas Instruments
- Lifecycle
- Active
- Stock
- 4931 PCS
- Package
- SOIC-14
- Series
- Data Acquisition - 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 | ADC0804LCWM | ADC08032CIWMX | Why it matters |
|---|---|---|---|
| Resolution | 8 bits | 8 bits | Both are 8-bit converters, so quantization step size is equivalent for a given reference voltage. |
| Architecture | Successive approximation (SAR) | Successive approximation (SAR) | Matching SAR architecture means similar conversion timing behavior and comparable dynamic performance. |
| Number of Input Channels | 1 (single-ended) | 2 (single-ended, multiplexed) | The second device can multiplex two analog inputs, allowing more signals to be measured without external muxing. |
| Interface Type | Parallel (8-bit) | Parallel (8-bit) | Both present data on a parallel bus, so the host MCU/CPU connection style is compatible. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Identical supply requirements simplify power-rail design and allow drop-in replacement in 5 V systems. |
| Package | 20-pin SOIC (wide) | 20-pin SOIC (wide) | Same package footprint enables PCB-level interchangeability without layout changes. |
| Conversion Time | ~100 µs | ~100 µs | Comparable conversion speed means similar maximum sampling rates in the target application. |
| Reference Input | External (VREF/2 pin) | External (VREF/2 pin) | Both allow scaling of the input range via an external reference, preserving measurement flexibility. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | The wider industrial range of the second device suits harsher environments where the commercial part may not be rated. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0804LCWM | ADC08032CIWMX |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Number of Inputs | 1 | 2 |
| Input Type | Differential | Differential, Pseudo-Differential, Single Ended |
| Data Interface | Parallel | SPI |
| Configuration | ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Supply | Internal |
| Voltage - Supply, Analog | 4.5V ~ 6.3V | 4.5V ~ 6.3V |
| Voltage - Supply, Digital | 4.5V ~ 6.3V | 4.5V ~ 6.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Sampling Rate(Per Second) | 10k | - |
Frequently asked questions
Are the ADC0804LCWM and ADC08032CIWMX interchangeable?
No. The ADC0804LCWM is an 8-bit successive-approximation A/D converter with a parallel microprocessor interface, while the ADC08032CIWMX is a 20-bit delta-sigma A/D converter with a serial interface. They differ in resolution, architecture, interface, and package, so they are not drop-in replacements.
What is the resolution and architecture of each device?
The ADC0804LCWM is an 8-bit successive-approximation register (SAR) ADC. The ADC08032CIWMX is a 20-bit delta-sigma ADC. The higher resolution of the ADC08032CIWMX suits low-frequency, high-accuracy measurements, while the ADC0804LCWM suits general-purpose 8-bit conversion.
How do the digital interfaces differ between the two parts?
The ADC0804LCWM provides a parallel 8-bit data bus with microprocessor control signals (CS, RD, WR, INTR) for direct CPU interfacing. The ADC08032CIWMX uses a serial digital interface for data output, reducing pin count and suited to SPI-style or serial host connections.
Do the ADC0804LCWM and ADC08032CIWMX use the same package?
No. The ADC0804LCWM is supplied in a 20-pin SOIC wide-body package (the "WM" suffix denotes the SOIC option). The ADC08032CIWMX is supplied in a 20-pin SOIC wide-body package as well, but the pin functions and internal architecture differ, so the packages are not functionally interchangeable.
What are the supply voltage requirements for each device?
The ADC0804LCWM operates from a single 5 V supply. The ADC08032CIWMX operates from a 5 V analog supply with a separate digital supply. Designers should confirm exact supply and reference requirements against the respective manufacturer datasheets before layout.
Which device is better for high-accuracy, low-speed measurements?
The ADC08032CIWMX is preferable for high-accuracy, low-speed measurements because its 20-bit delta-sigma architecture provides much finer resolution and lower quantization error than the 8-bit SAR ADC0804LCWM. The ADC0804LCWM is better suited to faster, lower-resolution general-purpose conversion.
Can the ADC0804LCWM and ADC08032CIWMX share the same PCB footprint?
Although both are offered in 20-pin SOIC wide-body packages, the pin assignments and functions differ between the two devices. A board designed for one part cannot be populated with the other without verifying pin compatibility and revising the layout, so they should not be treated as footprint-compatible.