Part A
ADS7816U
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6722 個数
- Package
- SOIC-8
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7816U and ADS7824UBG4 are not functionally interchangeable. The ADS7816U is a single-channel 12-bit SAR ADC in a compact SOIC-8 package, while the ADS7824UBG4 is a 4-channel 12-bit SAR ADC in a wider SOIC-28 package with a different serial interface and reference architecture. Designers must account for differences in channel count, package footprint, digital interface, and reference configuration before considering any substitution.
Different channel count
Different package footprint
Different digital interface
Different reference configuration
Parts at a glance
Part B
ADS7824UBG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 7529 個数
- Package
- SOIC-28
- 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 | ADS7816U | ADS7824UBG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide 12-bit resolution, so quantization step size is equivalent for a given reference voltage. |
| Number of Input Channels | 1 (single-ended) | 4 (single-ended, multiplexed) | The ADS7824UBG4 can multiplex among four inputs, while the ADS7816U handles only one channel, affecting system architecture and board space. |
| Sampling Rate | 200 kSPS | 100 kSPS | A higher sampling rate supports faster signal acquisition; the ADS7816U can sample twice as fast as the ADS7824UBG4. |
| Interface Type | SPI / serial (CS, DCLOCK, DOUT) | SPI / serial (CS, DCLOCK, DOUT) | Both use a similar serial interface, simplifying firmware reuse when swapping between the two parts. |
| Supply Voltage | 4.5 V to 5.5 V (single 5 V supply) | 4.5 V to 5.5 V (single 5 V supply) | Identical supply requirements mean the same power rail can be used for either device. |
| Reference Input | External reference | External reference | Both require an external reference, so accuracy and full-scale range depend on the same external reference design. |
| Package | 8-pin SOIC | 28-pin SOIC | Different package footprints and pin counts prevent direct drop-in replacement on an existing PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature ranges allow use in the same environmental conditions. |
| Power Consumption | Low power (approx. 1.2 mW at 5 V, 200 kSPS) | Higher power (multi-channel, approx. 15 mW typical) | The single-channel ADS7816U consumes significantly less power, which matters for battery-powered or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7824UBG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 40k |
| Number of Inputs | 1 | 4 |
| Input Type | Differential | Single Ended |
| Data Interface | SPI | SPI, Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7816U and ADS7824UBG4?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling ADC with a single pseudo-differential input, SPI-compatible serial interface, and an SOIC-8 package. The ADS7824UBG4 is a 12-bit, 100-kSPS 4-channel sampling ADC with a successive-approximation register, SPI/QSPI-compatible serial interface, and a SOIC-28 package. The ADS7824UBG4 integrates a 4-channel input multiplexer and reference, while the ADS7816U is a single-channel device in a much smaller package.
Are the ADS7816U and ADS7824UBG4 pin-compatible?
No. The ADS7816U is housed in an 8-pin SOIC (SOIC-8) package, while the ADS7824UBG4 is housed in a 28-pin SOIC (SOIC-28) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
How do the sampling rates of the ADS7816U and ADS7824UBG4 compare?
The ADS7816U supports a maximum sampling rate of 200 kSPS. The ADS7824UBG4 supports a maximum sampling rate of 100 kSPS. The ADS7816U therefore offers twice the throughput of the ADS7824UBG4.
How many input channels does each device provide?
The ADS7816U provides a single pseudo-differential input channel. The ADS7824UBG4 provides a 4-channel input multiplexer, allowing selection among four single-ended inputs (or two differential pairs, depending on configuration) via the serial interface.
Do both devices use the same serial interface?
Both devices use an SPI-compatible serial interface for communication with a host controller. However, the ADS7824UBG4 supports additional configuration through its serial interface for channel selection and operating modes, while the ADS7816U has a simpler fixed-function serial interface suited to single-channel operation.
How do the power consumption characteristics of the ADS7816U and ADS7824UBG4 differ?
The ADS7816U is specified as a micropower device operating from a single 5 V supply with low power consumption suitable for battery-powered and portable applications. The ADS7824UBG4 operates from a 5 V supply and, due to its 4-channel multiplexer and higher integration, draws more supply current than the ADS7816U. Designers should consult the respective datasheets for exact quiescent and operating current specifications.
Can the ADS7816U be used as a substitute for the ADS7824UBG4 in an existing design?
No, not as a direct substitute. The ADS7816U has only one input channel versus four on the ADS7824UBG4, a different package (SOIC-8 vs SOIC-28), a different pinout, and a different maximum sampling rate (200 kSPS vs 100 kSPS). Any substitution would require a redesign of the PCB, input signal routing, and firmware to accommodate the different channel count and interface behavior.
Which device is better suited for multi-channel data acquisition systems?
The ADS7824UBG4 is better suited for multi-channel data acquisition because it integrates a 4-channel input multiplexer, allowing multiple signals to be sampled by a single ADC. The ADS7816U, with only one input channel, would require external multiplexing circuitry to handle multiple signals.