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 ADS7813UB/1K are both 12-bit successive-approximation ADCs, but they differ fundamentally in resolution-adjacent architecture, sample rate, interface, and package, so the ADS7816U cannot serve as a direct substitute for the ADS7813UB/1K in existing designs. The ADS7813UB/1K offers a substantially faster conversion rate and a parallel interface, while the ADS7816U provides a slower serial interface in a smaller package; a redesign of the digital interface, timing, and board layout would be required before substitution could be considered.
Different sample rate
Different digital interface
Different package footprint
Different reference architecture
Parts at a glance
Part B
ADS7813UB/1K
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 4253 個数
- Package
- SOIC-16
- 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 | ADS7813UB/1K | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 16 bit | Higher resolution provides finer quantization steps, directly affecting measurement accuracy and dynamic range. |
| Sampling Rate | 200 kSPS | 40 kSPS | Maximum throughput determines the highest signal frequency that can be digitized without aliasing. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Channel count defines how many analog signals can be measured without external multiplexing. |
| Input Type | Single-ended | Single-ended | Input configuration affects common-mode rejection and suitability for grounded or differential sources. |
| Supply Voltage | 4.5 V to 5.5 V | 4.75 V to 5.25 V | Operating supply range must match the system rail to ensure correct conversion and logic compatibility. |
| Interface | SPI / Serial | SPI / Serial | Digital interface compatibility determines whether the part can drop into an existing microcontroller bus. |
| Package / Case | 8-SOIC | 16-SOIC | Footprint and pin count must match the PCB layout for a direct physical substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms the part meets the environmental requirements of the target application. |
| Reference Type | External | External | Reference configuration affects accuracy, drift, and the need for an external voltage reference in the design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7813UB/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 16 |
| 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 architectural differences between the ADS7816U and the ADS7813UB/1K?
The ADS7816U is a 12-bit, 200-kSPS successive-approximation register (SAR) analog-to-digital converter with a pseudo-differential input and a serial interface, housed in an SOIC-8 package. The ADS7813UB/1K is a 16-bit, 40-kSPS SAR ADC with a fully differential input, internal reference, and a serial interface, offered in an SOIC-28 package. The two devices differ in resolution, throughput, input configuration, and package footprint.
Can the ADS7816U be used as a drop-in replacement for the ADS7813UB/1K?
No. The ADS7816U and ADS7813UB/1K are not pin-compatible or functionally interchangeable. They differ in resolution (12-bit vs 16-bit), sampling rate (200 kSPS vs 40 kSPS), input topology (pseudo-differential vs fully differential), package (SOIC-8 vs SOIC-28), and reference architecture. A direct substitution is not possible without a complete redesign of the analog front end and digital interface.
How do the sampling rates and resolution of the ADS7816U and ADS7813UB/1K compare?
The ADS7816U offers 12-bit resolution at a maximum throughput of 200 kSPS, making it suitable for higher-speed, lower-resolution applications. The ADS7813UB/1K provides 16-bit resolution at a maximum throughput of 40 kSPS, targeting higher-precision, lower-speed measurement systems. The choice depends on the trade-off between dynamic performance and precision required by the application.
What are the input configuration differences between the ADS7816U and ADS7813UB/1K?
The ADS7816U features a pseudo-differential input, where the negative input is typically tied to a fixed reference or ground, allowing a single-ended signal with some common-mode rejection. The ADS7813UB/1K uses a fully differential input, which provides better common-mode noise rejection and improved dynamic performance, particularly in industrial and instrumentation environments.
Do the ADS7816U and ADS7813UB/1K have different reference requirements?
Yes. The ADS7816U requires an external reference voltage applied to its VREF pin and does not include an internal reference. The ADS7813UB/1K includes an internal reference, though it can also be configured to use an external reference. This difference affects system design complexity and the number of external components required.
How do the package and pin count of the ADS7816U and ADS7813UB/1K differ?
The ADS7816U is supplied in an 8-pin SOIC (SOIC-8) package, while the ADS7813UB/1K is supplied in a 28-pin SOIC (SOIC-28) package. The significant difference in pin count and footprint means the two devices cannot share the same PCB land pattern, and any replacement requires layout changes.
What serial interface do the ADS7816U and ADS7813UB/1K use?
Both devices provide a serial digital interface for connection to microcontrollers and DSPs. The ADS7816U uses a simple serial interface compatible with SPI, QSPI, and MICROWIRE. The ADS7813UB/1K also provides a serial interface, but with a different frame format and timing due to its 16-bit output word and additional configuration options. The interface timing and word length are not interchangeable.
Which applications are better suited to the ADS7816U versus the ADS7813UB/1K?
The ADS7816U is better suited to space-constrained, moderate-precision, higher-speed applications such as portable instrumentation, battery monitoring, and general-purpose data acquisition where a small package and 200-kSPS throughput are beneficial. The ADS7813UB/1K is better suited to high-precision, lower-speed applications such as industrial process control, weigh scales, and medical instrumentation where 16-bit resolution and a fully differential input with an internal reference are required.