Part A
ADS7816U
Texas Instruments
- Lifecycle
- Active
- Stock
- 6722 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7816U and ADS7800KUG4 are not functionally interchangeable. The ADS7816U is a 12-bit, 200 kSPS successive-approximation ADC in a small SOIC-8 package with a serial SPI interface, while the ADS7800KUG4 is a 12-bit, 333 kSPS sampling ADC in a larger SOIC-28 package with a parallel interface and a different analog input range. The differences in package footprint, digital interface, sampling rate, and analog input configuration prevent direct substitution without a board redesign.
Different package footprint
Different digital interface
Different sampling rate
Different analog input range
Parts at a glance
Part B
ADS7800KUG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 2642 PCS
- Package
- SOIC-24
- 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 | ADS7816U | ADS7800KUG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so quantization accuracy is equivalent for substitutability. |
| Sampling Rate | 200 kSPS | 333 kSPS | The ADS7800KUG4 supports a higher throughput, which matters if the application needs faster conversion. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning topology can remain the same. |
| Interface | SPI / Serial | Parallel | The digital interface differs significantly; a serial-to-parallel redesign is required, affecting MCU pin count and firmware. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V supply, so power rail design is compatible. |
| Package | SOIC-8 | SOIC-28 | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Reference | External | Internal | The ADS7800KUG4 includes an internal reference, simplifying design, while the ADS7816U requires an external reference. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7800KUG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 333k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Single Ended |
| Data Interface | 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 | Internal |
| Voltage - Supply, Analog | 5V | 5V, -11.4V ~ 16.5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS7816U and ADS7800KUG4?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling analog-to-digital converter with a serial (SPI-compatible) interface, housed in an SOIC-8 package. The ADS7800KUG4 is a 12-bit, 333-kSPS sampling ADC with a parallel 12-bit output interface, housed in a 28-pin SOIC package. The ADS7816U targets low-power, space-constrained designs, while the ADS7800KUG4 provides higher throughput with a parallel bus interface.
Are the ADS7816U and ADS7800KUG4 pin-compatible or package-compatible?
No. The ADS7816U is supplied in an 8-pin SOIC (D) package, whereas the ADS7800KUG4 is supplied in a 28-pin SOIC (DW) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
How do the sampling rates and throughput of the two converters compare?
The ADS7816U is specified for a 200-kSPS sampling rate, while the ADS7800KUG4 is specified for a 333-kSPS sampling rate. The ADS7800KUG4 therefore offers higher throughput, which may matter in faster acquisition systems.
What digital interfaces do the ADS7816U and ADS7800KUG4 use?
The ADS7816U uses a serial interface compatible with SPI and QSPI, reducing pin count and simplifying isolation. The ADS7800KUG4 provides a parallel 12-bit output interface, which requires more I/O pins but can simplify interfacing to parallel-bus microcontrollers or DSPs.
How do the power consumption characteristics of the ADS7816U and ADS7800KUG4 differ?
The ADS7816U is designed as a micropower device, making it suitable for battery-powered and portable applications. The ADS7800KUG4, with its higher throughput and parallel interface, is not positioned as a micropower converter. Designers should consult the respective datasheets for exact supply current and power dissipation specifications under their operating conditions.
Can the ADS7816U be used as a direct substitute for the ADS7800KUG4 in an existing design?
No. The two devices differ in package (8-pin SOIC vs 28-pin SOIC), interface (serial vs parallel), and sampling rate (200 kSPS vs 333 kSPS). A direct substitution would require PCB redesign, interface rework, and validation against the target system requirements.
What are the typical application targets for each converter?
The ADS7816U is typically used in portable instrumentation, battery-powered systems, and space-constrained data acquisition where a serial interface and low power are advantageous. The ADS7800KUG4 is typically used in higher-throughput data acquisition systems, industrial control, and applications that benefit from a parallel interface to a host processor.