Part A
ADC0848CCVX
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2942 個数
- Package
- LCC-28
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADC0848CCVX and ADC0838BCVX are both 8-bit successive-approximation ADCs with an 8-channel multiplexer in a 20-pin SOIC package, sharing the same pinout and serial interface family. The ADC0848CCVX offers a higher maximum clock frequency and faster conversion time, while the ADC0838BCVX provides a wider guaranteed supply voltage range. Both are functionally interchangeable in most multiplexed 8-bit ADC applications, though the ADC0838BCVX should be validated for timing margin in designs that depend on the ADC0848CCVX's faster conversion rate.
Resolution and Architecture
High match
Package and Pinout
High match
Conversion Speed
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADC0838BCVX
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 5946 個数
- Package
- LCC-20
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADC0838BCVX | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 8 bit | Both are 8-bit ADCs, so resolution is identical and not a differentiator for substitutability. |
| Number of Input Channels | 8 channels (single-ended) / 4 channels (differential) | 8 channels (single-ended) / 4 channels (differential) | Channel count determines how many analog signals can be multiplexed into the converter; both offer the same flexibility. |
| Interface Type | Parallel (microprocessor-compatible) | Serial (Microwire/SPI-compatible) | The interface differs fundamentally: parallel vs serial, which affects pin count, host wiring, and firmware, making them non-drop-in substitutes. |
| Conversion Time | Approximately 30 µs | Approximately 32 µs | Conversion time affects maximum sampling rate; the values are close but not identical, influencing throughput-sensitive designs. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, so power rail requirements are compatible. |
| Package | 28-pin PLCC (VX suffix) | 20-pin PLCC (VX suffix) | Different package pin counts and footprints mean the parts are not physically interchangeable on the same PCB. |
| Operating Temperature Range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Both are commercial-grade parts, so environmental operating limits are equivalent. |
| Reference Input | External reference supported | External reference supported | External reference capability allows scaling of the input range; both support it, so accuracy scaling options are comparable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0848CCVX | ADC0838BCVX |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Number of Inputs | 4, 8 | 4, 8 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | Parallel | SPI |
| Configuration | MUX-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 4.5V ~ 6V | 4.5V ~ 6.3V |
| Voltage - Supply, Digital | 4.5V ~ 6V | 4.5V ~ 6.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Sampling Rate(Per Second) | 25k | - |
Frequently asked questions
What are the key differences between the ADC0848CCVX and ADC0838BCVX?
The ADC0848CCVX is an 8-channel, 8-bit successive-approximation A/D converter with a multiplexer, offering single-ended or differential inputs and a 0V to 5V analog input range. The ADC0838BCVX is an 8-channel, 8-bit serial I/O A/D converter with a similar multiplexer configuration but is specified with a ±1 LSB linearity error grade (B grade) versus the ADC0848C's ±1 LSB typical. Both are available in 28-pin PLCC packages and operate from a single 5V supply, but they differ in interface timing, reference configuration, and specified accuracy grades.
Are the ADC0848CCVX and ADC0838BCVX pin-compatible?
No. Although both devices are housed in 28-pin PLCC packages, their pin functions and control signal assignments differ. The ADC0848CCVX uses a parallel microprocessor interface with CS, RD, WR, and interrupt signals, while the ADC0838BCVX uses a serial interface with CS, CLK, DI, and DO pins. Therefore, they are not direct drop-in replacements and require different PCB routing and firmware.
What is the resolution and conversion architecture of these devices?
Both the ADC0848CCVX and ADC0838BCVX are 8-bit successive-approximation register (SAR) A/D converters. Each provides 8-bit resolution with a total unadjusted error specified in the datasheet, and both include an 8-channel analog multiplexer that supports single-ended, differential, and pseudo-differential input configurations.
What supply voltage and reference requirements apply to these converters?
Both devices operate from a single +5V supply. The ADC0848CCVX uses the supply voltage as the reference (ratiometric operation) with a specified analog input range of 0V to VCC. The ADC0838BCVX supports an external reference voltage applied to the VREF pin, allowing the analog input span to be set independently of the supply, typically from 0V to VREF.
How do the digital interfaces of the ADC0848CCVX and ADC0838BCVX differ?
The ADC0848CCVX provides a parallel interface compatible with most microprocessors and microcontrollers, using CS, RD, WR, and an interrupt output to signal conversion completion. The ADC0838BCVX uses a serial interface with a clock, chip select, data-in, and data-out, which reduces pin count and is suited to systems with limited I/O. The choice depends on host interface availability and board space.
What are the specified accuracy grades for these two parts?
The ADC0848CCVX is specified with a total unadjusted error of ±1 LSB (typical) over its operating temperature range. The ADC0838BCVX is the B-grade version, specified with a linearity error of ±1 LSB maximum. Designers should consult the respective manufacturer datasheets for the complete error budget, including offset, gain, and linearity specifications over temperature.
Can the ADC0848CCVX and ADC0838BCVX operate over the same temperature range?
Both devices are specified for commercial temperature operation, typically 0°C to +70°C, in their C-grade suffixes (CCVX and BCVX). Industrial and extended temperature versions are available under different suffix codes. The operating temperature range should be verified against the specific orderable part number in the manufacturer datasheet.
Which device is better suited for a design with limited PCB space and few host I/O pins?
The ADC0838BCVX is generally preferable when host I/O pins are limited, because its serial interface requires only a few control lines compared with the parallel bus interface of the ADC0848CCVX. However, the serial interface may require additional firmware overhead for bit-banging or SPI-compatible timing, so the trade-off between pin count and software complexity should be evaluated for the specific system.