Part A
ADC0848CCVX
Texas Instruments
- Lifecycle
- Active
- Stock
- 2942 PCS
- Package
- LCC-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADC0848CCVX and ADC0820BCV are not drop-in replacements for one another. The ADC0848CCVX is an 8-channel, 8-bit successive-approximation ADC with a parallel microprocessor interface, while the ADC0820BCV is a single-channel, 8-bit half-flash ADC with a similar parallel interface. Although both share an 8-bit resolution and a 20-pin package, their channel count, conversion architecture, and pinout differ, so a direct board-level substitution is not possible without redesign.
Different channel count
Different conversion architecture
Different pinout
Different input configuration
Parts at a glance
Part B
ADC0820BCV
Texas Instruments
- Lifecycle
- Active
- Stock
- 8268 PCS
- Package
- LCC-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADC0848CCVX | ADC0820BCV | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 8 bit | Both are 8-bit converters, so resolution is equivalent for substitutability. |
| Number of Input Channels | 8 (multiplexed, single-ended or differential) | 1 (single-ended) | The ADC0848 provides an 8-channel multiplexer, while the ADC0820 has a single input, so channel count is a major functional difference. |
| Conversion Architecture | Successive approximation register (SAR) | Half-flash (two-step flash) | Different architectures affect conversion speed, timing behavior, and interface requirements. |
| Conversion Time | Approximately 30 µs (typical) | Approximately 2.5 µs (typical) | The ADC0820 converts much faster, which matters for high-speed sampling applications. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, so power supply compatibility is maintained. |
| Interface Type | Parallel (8-bit, with address/channel select) | Parallel (8-bit, with RD/WR control) | Both use parallel interfaces but with different control signaling, affecting microcontroller/CPU interfacing. |
| Package | 28-pin PLCC (V suffix) | 20-pin SOIC (V suffix) | Different package footprints and pin counts prevent direct board-level substitution. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | Both are commercial-grade, so environmental compatibility is equivalent. |
| Input Configuration | Single-ended or differential (software selectable) | Single-ended only | Differential input capability in the ADC0848 enables noise rejection and bipolar signal measurement not possible with the ADC0820. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0848CCVX | ADC0820BCV |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Pseudo-Differential, Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | MUX-ADC | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | Flash |
| Reference Type | External | External |
| Voltage - Supply, Analog | 4.5V ~ 6V | 4.5V ~ 8V |
| Voltage - Supply, Digital | 4.5V ~ 6V | 4.5V ~ 8V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Sampling Rate(Per Second) | 25k | - |
Frequently asked questions
What are the key architectural differences between the ADC0848CCVX and the ADC0820BCV?
The ADC0848CCVX is an 8-bit successive-approximation ADC with an 8-channel multiplexer, allowing selection among eight single-ended or four differential input channels. The ADC0820BCV is an 8-bit flash (half-flash) ADC with a single analog input channel and no on-chip multiplexer. The ADC0848CCVX is accessed via a microprocessor-compatible parallel interface, while the ADC0820BCV provides a similar parallel interface but is optimized for high-speed single-channel conversion.
How do the conversion speeds of the ADC0848CCVX and ADC0820BCV compare?
The ADC0820BCV is significantly faster, with a typical conversion time of approximately 1.5 microseconds (2.5 microseconds maximum) due to its half-flash architecture. The ADC0848CCVX uses successive approximation and has a typical conversion time of about 30 microseconds. The ADC0820BCV is therefore better suited to high-speed single-channel sampling, while the ADC0848CCVX trades speed for multi-channel input flexibility.
Are the ADC0848CCVX and ADC0820BCV pin-compatible or package-compatible?
No. The ADC0848CCVX is supplied in a 28-pin package (PLCC or DIP depending on the suffix), while the ADC0820BCV is supplied in a 20-pin package. The pin counts, pin functions, and PCB land patterns differ, so the two devices are not drop-in replacements for one another.
What are the input voltage ranges and reference requirements for these two ADCs?
Both devices operate from a single +5 V supply and are designed for analog input ranges of 0 V to +5 V when the reference is tied to the supply. The ADC0848CCVX supports ratiometric operation with an external reference and provides a multiplexed input structure. The ADC0820BCV has a single analog input and uses the supply voltage as its reference in typical configurations. Designers should confirm exact reference and input range specifications against the respective manufacturer datasheets.
Can the ADC0848CCVX be used to replace the ADC0820BCV in an existing design?
Not directly. The ADC0848CCVX has a different pin count, package, and interface timing, and it adds an 8-channel multiplexer that the ADC0820BCV does not have. A replacement would require PCB redesign, interface timing validation, and confirmation that the slower conversion time of the ADC0848CCVX is acceptable for the application.
Which device is more suitable for multi-channel data acquisition?
The ADC0848CCVX is the appropriate choice for multi-channel data acquisition because it integrates an 8-channel multiplexer supporting eight single-ended or four differential inputs. The ADC0820BCV has only a single analog input and would require external multiplexing to handle multiple channels, adding board space and complexity.
What are the typical interface and control signal differences between the ADC0848CCVX and ADC0820BCV?
The ADC0848CCVX uses a microprocessor-compatible parallel interface with address lines for channel selection, along with CS, RD, and WR control signals for multiplexer and conversion control. The ADC0820BCV uses a simpler parallel interface with CS, RD, and WR (or RD mode) control for a single channel. The additional address and control lines on the ADC0848CCVX reflect its multiplexed input architecture.
Do both devices support the same power supply and operating temperature range?
Both devices are specified for operation from a single +5 V supply. The commercial-grade suffixes (CCVX for the ADC0848 and BCV for the ADC0820) indicate commercial temperature range operation, typically 0°C to +70°C. Designers should verify the exact temperature grade and supply tolerances in the respective manufacturer datasheets before finalizing a design.