Part A
ADS7816U
德州儀器
- Lifecycle
- Active
- Stock
- 6722 件
- Package
- SOIC-8
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS7816U and ADS7812U/1K are both 12-bit successive-approximation ADCs, but they differ in resolution-critical architecture, package, and interface characteristics that prevent direct substitution. The ADS7816U is a micropower 12-bit ADC in an 8-pin SOIC with a serial interface, while the ADS7812U/1K is a 12-bit ADC in a 16-pin SOIC offering a different input and reference configuration. Designers must validate timing, reference, and layout requirements before considering either part as a functional alternative.
Different package footprint
Different pin count
Different input configuration
Different reference architecture
Parts at a glance
Part B
ADS7812U/1K
德州儀器
- Lifecycle
- Active
- Stock
- 6923 件
- Package
- SOIC-16
- Series
- 資料獲取-模數轉換器（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 | ADS7812U/1K | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Sampling Rate | 200 kSPS | 40 kSPS | The ADS7816U supports a much higher throughput, so it can replace the slower ADS7812U/1K in faster acquisition systems but not vice versa. |
| Input Type | Single-ended (pseudo-differential) | Single-ended | Input configuration affects how the converter connects to the signal source and whether differential or ground-referenced signals can be handled. |
| Interface | SPI / serial | SPI / serial | Both use a serial interface, simplifying digital-side substitution in microcontroller-based designs. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Matching supply requirements allow the parts to share the same power rail in a replacement scenario. |
| Package | SOIC-8 | SOIC-16 | Different package footprints mean a board layout change is required when substituting one part for the other. |
| Reference | External reference | Internal reference | The reference architecture affects accuracy, external component count, and system calibration requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings indicate both parts suit the same industrial-grade environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7812U/1K |
|---|---|---|
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Single Ended |
| Data Interface | SPI | SPI |
| 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 the ADS7812U/1K?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling ADC with a serial interface, typically offered in an SOIC-8 package. The ADS7812U/1K is a 12-bit, 40-kSPS sampling ADC with a serial interface and an internal reference, typically offered in an SOIC-16 package. The ADS7812U/1K is supplied in a 1,000-unit tape-and-reel (the "1K" suffix), while the ADS7816U is generally supplied in tube or standard reel quantities depending on the distributor.
Are the ADS7816U and ADS7812U/1K pin-compatible?
No. The ADS7816U is an 8-pin device, while the ADS7812U/1K is a 16-pin device, so they are not pin-compatible and cannot be interchanged on the same PCB footprint without a layout change.
Do both devices have the same sampling rate?
No. The ADS7816U supports a throughput of up to 200 kSPS, whereas the ADS7812U/1K supports up to 40 kSPS. The ADS7816U is therefore suitable for higher-speed sampling applications, while the ADS7812U/1K targets lower-speed, higher-resolution-system designs.
Do both ADCs include an internal voltage reference?
No. The ADS7812U/1K includes an internal reference, while the ADS7816U requires an external reference voltage applied to its VREF pin. Designs using the ADS7816U must therefore provide an external reference, whereas the ADS7812U/1K can operate with its internal reference.
What supply voltage do the ADS7816U and ADS7812U/1K require?
Both devices operate from a single 5 V supply. The ADS7816U is specified for a 5 V supply with low power consumption, and the ADS7812U/1K is also specified for a 5 V single-supply operation.
What serial interface do these ADCs use?
Both the ADS7816U and the ADS7812U/1K use a serial interface compatible with SPI and similar synchronous serial ports, allowing connection to microcontrollers and DSPs. The ADS7816U provides a serial output with a synchronous clock, and the ADS7812U/1K provides a serial interface with a synchronous clock as well.
Can the ADS7816U directly replace the ADS7812U/1K in an existing design?
No. Because the two devices differ in package pin count (8 vs 16 pins), sampling rate (200 kSPS vs 40 kSPS), and reference architecture (external vs internal), a direct replacement is not possible without verifying schematic, layout, and timing compatibility against the respective manufacturer datasheets.
What is the significance of the "1K" suffix on the ADS7812U/1K?
The "1K" suffix indicates the device is supplied in a 1,000-unit tape-and-reel packaging format, which is intended for automated production assembly. The ADS7816U is typically ordered in tube or reel quantities depending on the distributor, and its ordering suffix does not denote a 1,000-unit reel by default.