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 ADS7804UE4 are not drop-in replacements for each other. The ADS7816U is a 12-bit, 200 kSPS successive-approximation ADC with a serial (SPI-compatible) interface in a small 8-pin SOIC package, while the ADS7804UE4 is a 12-bit, 100 kSPS sampling ADC with a parallel 8-bit/16-bit interface in a 28-pin SOIC package. They differ in resolution-adjacent sampling rate, digital interface, package footprint, and analog input configuration, so a direct board-level substitution is not possible without redesign.
Different digital interface
Different package footprint
Different sampling rate
Different input configuration
Parts at a glance
Part B
ADS7804UE4
德州儀器
- Lifecycle
- Active
- Stock
- 4392 件
- Package
- SOIC-28
- 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 | ADS7804UE4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so they offer the same nominal quantization step and are interchangeable in terms of resolution. |
| Sampling Rate | 200 kSPS | 100 kSPS | The ADS7816U can sample twice as fast, which matters for higher-bandwidth signals or faster control loops. |
| Input Type | Single-ended (pseudo-differential) | Single-ended | Input configuration affects how the signal source must be connected and whether common-mode rejection is available. |
| Interface | SPI / serial | Parallel | The digital interface determines the host connection and firmware; serial vs parallel are not directly interchangeable without redesign. |
| Supply Voltage | 5 V single supply | 5 V single supply | Both operate from a 5 V supply, simplifying power-rail compatibility in existing designs. |
| Package | 8-pin SOIC | 28-pin SOIC | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Reference | External reference | Internal reference | Internal vs external reference changes accuracy, drift behavior, and the need for external reference circuitry. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial ambient conditions. |
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 | ADS7804UE4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 100k |
| 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 | 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 ADS7804UE4?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling ADC with a serial (SPI-compatible) interface, housed in an SOIC-8 package. The ADS7804UE4 is a 12-bit, 100-kSPS sampling ADC with a parallel 8-bit bus interface, housed in a 28-pin SOIC package. They differ in resolution-adjacent architecture, sampling rate, interface type, package size, and power consumption.
Are the ADS7816U and ADS7804UE4 pin-compatible or directly interchangeable?
No. The ADS7816U uses an 8-pin SOIC package with a serial interface, while the ADS7804UE4 uses a 28-pin SOIC package with a parallel interface. The pin counts, pin functions, and PCB land patterns are different, so they are not drop-in replacements.
What are the sampling rates of the ADS7816U and ADS7804UE4?
The ADS7816U has a specified sampling rate of 200 kSPS. The ADS7804UE4 has a specified sampling rate of 100 kSPS. The ADS7816U therefore offers twice the throughput of the ADS7804UE4.
What interface types do these two ADCs use?
The ADS7816U provides a serial interface compatible with SPI and similar synchronous serial ports, requiring fewer I/O lines. The ADS7804UE4 provides a parallel 8-bit data bus interface, which requires more I/O pins but allows direct connection to parallel microcontrollers or DSP buses.
How do the power consumption figures compare between the ADS7816U and ADS7804UE4?
The ADS7816U is specified as a micropower device with very low operating current, typically in the low hundreds of microamperes at 5 V, making it suitable for battery-powered and portable systems. The ADS7804UE4 draws higher supply current due to its parallel interface and larger die, typically in the tens of milliamperes range. Designers should consult the respective datasheets for exact supply current specifications at the intended operating conditions.
What are the package and pin count differences between the ADS7816U and ADS7804UE4?
The ADS7816U is supplied in an 8-pin SOIC package. The ADS7804UE4 is supplied in a 28-pin SOIC package. The larger package of the ADS7804UE4 accommodates the parallel data bus and additional control pins.
Which applications are better suited to the ADS7816U versus the ADS7804UE4?
The ADS7816U is well suited to space-constrained, low-power, and portable designs that can use a serial interface, such as handheld instruments and remote sensor nodes. The ADS7804UE4 is better suited to systems that require a parallel bus interface and can accommodate a larger package, such as industrial data acquisition boards and systems with parallel microcontroller or DSP buses.
Do both devices operate from a single 5 V supply?
Yes. Both the ADS7816U and ADS7804UE4 are specified for operation from a single 5 V analog supply. Designers should verify the exact supply voltage range and any additional reference or digital supply requirements in the respective manufacturer datasheets.