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 ADS7813U/1K are not drop-in replacements for each other. Although both are 12-bit successive-approximation ADCs from Texas Instruments, they differ in resolution-critical architecture, package footprint, and sampling performance, so the ADS7813U/1K cannot be substituted directly for the ADS7816U without design validation.
Different package footprint
Different sampling rate
Different input architecture
Different supply configuration
Parts at a glance
Part B
ADS7813U/1K
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2270 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 | ADS7813U/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 | Determines the maximum signal bandwidth the ADC can digitize; a faster rate supports higher-frequency inputs. |
| Number of Input Channels | 1 (single-ended) | 1 (pseudo-differential) | Input configuration affects how the signal is referenced and the ability to reject common-mode noise. |
| Interface Type | SPI / Serial | SPI / Serial | Both use a serial interface, but timing and frame formats must be checked for direct drop-in compatibility. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Supply voltage must match the system rail; identical values simplify power design substitution. |
| Reference Input | External | External | External references allow scaling of the input range; both require an external reference for full-scale accuracy. |
| Package | SOIC-8 | SOIC-16 | Different package footprints require PCB layout changes and are not physically drop-in compatible. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Confirms both parts are rated for industrial temperature environments. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7813U/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| 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 differences between the ADS7816U and the ADS7813U/1K?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling analog-to-digital converter with a pseudo-differential input, while the ADS7813U/1K is a 16-bit, 40-kSPS sampling ADC with a similar serial interface. The ADS7816U offers higher throughput at lower resolution, whereas the ADS7813U/1K provides higher resolution at a reduced sampling rate. Both are offered in SOIC packages and operate from a single 5-V supply.
Are the ADS7816U and ADS7813U/1K pin-compatible?
No. The ADS7816U is an 8-pin SOIC device, while the ADS7813U/1K is a 16-pin SOIC device. Pin count, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
What resolution and sampling rate does each device support?
The ADS7816U provides 12-bit resolution with a maximum sampling rate of 200 kSPS. The ADS7813U/1K provides 16-bit resolution with a maximum sampling rate of 40 kSPS. The choice depends on whether the application prioritizes resolution or throughput.
Do both parts use the same serial interface?
Both devices use a serial interface for data output, but the frame length and timing differ because of their different resolutions. The ADS7816U outputs 12 bits of conversion data, while the ADS7813U/1K outputs 16 bits. System firmware and host SPI/SSI timing must be adjusted accordingly.
What are the power supply and reference requirements for these ADCs?
Both the ADS7816U and ADS7813U/1K operate from a single 5-V analog supply. Each device uses an external reference voltage to set the input full-scale range, so the reference source and decoupling must be selected to match the required accuracy and input span.
Can the ADS7816U be used as a replacement for the ADS7813U/1K in an existing design?
Not directly. The ADS7816U has lower resolution (12-bit vs 16-bit), a different package (8-pin vs 16-pin SOIC), and a different maximum sampling rate (200 kSPS vs 40 kSPS). A replacement requires PCB redesign, firmware changes, and validation against the original accuracy and throughput requirements.
Which device is better suited for high-resolution, low-speed measurement applications?
The ADS7813U/1K is better suited for high-resolution, low-speed measurement applications because it provides 16-bit resolution at up to 40 kSPS. The ADS7816U is better suited for applications requiring faster sampling at 12-bit resolution.