Part A
ADC0804LCN
Renesas Electronics Corporation
- Lifecycle
- Active
- Stock
- 1808 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADC0804LCN and ADC0808CCN/NOPB are both 8-bit successive-approximation A/D converters, but they are not functionally interchangeable. The ADC0804LCN provides a single differential input channel with an on-chip clock and internal reference, while the ADC0808CCN/NOPB offers an 8-channel multiplexed single-ended input architecture requiring an external clock and external reference. These differences in channel count, input configuration, clocking, and reference scheme mean the two devices cannot be substituted without redesigning the surrounding circuit.
Different channel count
Different input configuration
Different clocking scheme
Different reference architecture
Parts at a glance
Part B
ADC0808CCN/NOPB
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 3641 PCS
- Package
- DIP-28
- 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 | ADC0804LCN | ADC0808CCN/NOPB | Why it matters |
|---|---|---|---|
| Resolution | 8 bits | 8 bits | Both provide 8-bit resolution, so quantization accuracy is equivalent for substitutability. |
| Number of Input Channels | 1 (single-ended) | 8 (single-ended, multiplexed) | The ADC0808 can multiplex up to 8 analog inputs, while the ADC0804 handles only one; this affects system architecture and channel count. |
| Interface Type | Parallel (microprocessor-compatible) | Parallel (microprocessor-compatible) | Both use a parallel interface, but pinout and control signals differ, so direct drop-in replacement is not possible. |
| Conversion Architecture | Successive approximation | Successive approximation | Same SAR architecture gives similar conversion behavior and timing characteristics. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, simplifying power design when substituting. |
| Package | 20-pin DIP | 28-pin DIP | Different pin counts and footprints mean the parts are not physically interchangeable on the same PCB. |
| Conversion Time | ~100 µs | ~100 µs | Similar conversion speed means comparable throughput for sampling applications. |
| Reference Voltage | Internal or external (2.5 V typical internal) | External reference required | The ADC0804 has an internal reference option, while the ADC0808 requires an external reference, affecting design complexity and accuracy. |
| Operating Temperature Range | 0°C to +70°C | 0°C to +70°C | Identical commercial temperature range supports use in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0804LCN | ADC0808CCN/NOPB |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Sampling Rate(Per Second) | - | 10k |
| Number of Inputs | 1 | 8 |
| Input Type | Differential | Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Supply | External |
| Voltage - Supply, Analog | 4.5V ~ 6.3V | 4.5V ~ 6.5V |
| Voltage - Supply, Digital | 4.5V ~ 6.3V | 4.5V ~ 6.5V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Base Product Number | ADC0804 | - |
| Sampling Rate (Per Second) | 10k | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Through Hole | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the ADC0804LCN and the ADC0808CCN/NOPB?
The ADC0804LCN is a single-channel 8-bit successive-approximation ADC with an on-chip clock generator and internal reference, housed in a 20-pin DIP. The ADC0808CCN/NOPB is an 8-channel 8-bit successive-approximation ADC with an 8-channel multiplexer, requiring an external clock and external reference, also in a 28-pin DIP. The ADC0808CCN/NOPB is a lead-free (NOPB) variant.
Are the ADC0804LCN and ADC0808CCN/NOPB pin-compatible?
No. The ADC0804LCN is a 20-pin device, while the ADC0808CCN/NOPB is a 28-pin device. Their pin counts, pin functions, and package footprints differ, so they are not drop-in replacements for each other.
How many analog input channels does each device support?
The ADC0804LCN provides a single differential analog input channel. The ADC0808CCN/NOPB provides 8 single-ended analog input channels through an on-chip multiplexer, selectable via 3 address lines.
Do these ADCs require an external clock?
The ADC0804LCN includes an on-chip clock generator and can operate with only an external resistor and capacitor for clock timing. The ADC0808CCN/NOPB requires an external clock signal applied to the CLOCK input pin.
What is the resolution and conversion architecture of both devices?
Both the ADC0804LCN and ADC0808CCN/NOPB are 8-bit successive-approximation ADCs, providing 8-bit resolution with a parallel digital output interface.
How do the reference voltage requirements differ between the two parts?
The ADC0804LCN has an internal reference and typically operates with VREF/2 set via an external divider for full-scale adjustment. The ADC0808CCN/NOPB requires an external reference voltage applied to the VREF(+) and VREF(-) pins to define the conversion range.
What are the typical supply voltage requirements for these devices?
Both the ADC0804LCN and ADC0808CCN/NOPB operate from a single 5 V supply (VCC), consistent with their TTL-compatible parallel interfaces.
What package types are the ADC0804LCN and ADC0808CCN/NOPB available in?
The ADC0804LCN is supplied in a 20-pin plastic DIP (N suffix). The ADC0808CCN/NOPB is supplied in a 28-pin plastic DIP (N suffix) and is a lead-free (NOPB) RoHS-compliant variant.