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 ADS7806U/1K are both 12-bit successive-approximation ADCs, but they differ fundamentally in resolution architecture, sampling rate, package footprint, and interface timing, so the ADS7806U/1K cannot be used as a direct drop-in substitute for the ADS7816U without circuit and layout redesign.
Different sampling rate
Different package footprint
Different interface timing
Different supply configuration
Parts at a glance
Part B
ADS7806U/1K
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 8689 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 | ADS7806U/1K | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so digital output word width is identical and firmware bit handling is compatible. |
| Sampling Rate | 200 kSPS | 40 kSPS | The ADS7816U supports a much higher throughput, so it can replace the slower ADS7806U/1K in faster acquisition systems but not vice versa. |
| Input Type | Single-ended, pseudo-differential | Single-ended | Input configuration affects how the analog source must be wired and whether differential rejection is available. |
| Input Voltage Range | 0 V to VREF (external reference) | 0 V to 10 V (internal or external reference) | The full-scale span determines the LSB size and whether the part can directly accept a 10 V signal without external scaling. |
| Reference | External only | Internal or external | An internal reference simplifies the design and reduces external component count, while external-only requires a precision reference on the board. |
| Supply Voltage | 5 V single supply | 5 V single supply | Matching supply requirements allows the parts to share the same power rail in a common system. |
| Interface | SPI-compatible serial | Parallel (byte/word) | Serial versus parallel interface fundamentally changes the host connection, pin count, and firmware, so they are not drop-in interchangeable. |
| Package | 8-pin SOIC | 28-pin SOIC | Different package footprints and pin counts prevent direct board-level substitution without a layout change. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial ambient conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7806U/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| 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, 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 the ADS7806U/1K?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling analog-to-digital converter with a serial interface, while the ADS7806U/1K is a 12-bit, 500-kSPS sampling ADC with a parallel interface. The ADS7816U operates from a single 5-V supply and is offered in an SOIC-8 package, whereas the ADS7806U/1K operates from a 5-V supply with a separate digital supply and is offered in a 28-pin SOIC package. The ADS7806U/1K also integrates a reference and a sample-and-hold amplifier, while the ADS7816U requires an external reference.
Are the ADS7816U and ADS7806U/1K pin-compatible?
No. The ADS7816U is housed in an 8-pin SOIC package, while the ADS7806U/1K is housed in a 28-pin SOIC package. The pin counts, pin functions, and package footprints differ, so they are not pin-compatible and cannot be used as drop-in replacements on the same PCB land pattern.
What are the maximum sampling rates of the ADS7816U and ADS7806U/1K?
The ADS7816U has a maximum sampling rate of 200 kSPS. The ADS7806U/1K has a maximum sampling rate of 500 kSPS. The higher throughput of the ADS7806U/1K makes it suitable for faster signal acquisition applications, while the ADS7816U targets lower-power, lower-speed designs.
Do the ADS7816U and ADS7806U/1K have the same digital interface?
No. The ADS7816U provides a serial digital interface for connection to microcontrollers and DSPs, reducing pin count and board space. The ADS7806U/1K provides a parallel digital interface for direct connection to a parallel bus. The interface type is a primary selection criterion when choosing between the two devices.
What are the power supply requirements for the ADS7816U and ADS7806U/1K?
The ADS7816U operates from a single 5-V analog supply. The ADS7806U/1K operates from a 5-V analog supply and also provides a separate digital supply pin to interface with 5-V or 3-V digital logic. Designers should verify the exact supply voltage ranges and current consumption in the respective manufacturer datasheets before finalizing a design.
Does the ADS7806U/1K include an internal voltage reference?
Yes. The ADS7806U/1K integrates an internal voltage reference, which reduces external component count. The ADS7816U does not include an internal reference and requires an external reference voltage to be supplied by the system. This difference affects board space, BOM cost, and reference accuracy budgeting.
Can the ADS7816U and ADS7806U/1K be used interchangeably in an existing design?
No. Because the two devices differ in package, pin count, digital interface, sampling rate, and reference architecture, they cannot be used interchangeably without a PCB redesign and firmware changes. A direct substitution is not possible; each device must be evaluated against the specific requirements of the target application.
Which device is better suited for low-power portable applications?
The ADS7816U is generally better suited for low-power portable applications because it is a micropower 12-bit ADC in a small 8-pin SOIC package with a serial interface, which minimizes pin count and board space. The ADS7806U/1K, with its parallel interface, higher sampling rate, and larger 28-pin package, is oriented toward higher-throughput systems rather than space- and power-constrained portable designs.