Part A
ADS7816U
Texas Instruments
- Lifecycle
- Active
- Stock
- 6722 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7816U and ADS7807U/1K are not drop-in replacements for one another. The ADS7816U is a 12-bit, 200 kSPS successive-approximation ADC in a small 8-pin SOIC package with a serial interface, while the ADS7807U/1K is a 16-bit, 40 kSPS ADC in a 28-pin SOIC package with a parallel interface. The differences in resolution, sampling rate, package footprint, and digital interface make direct substitution impractical without a full board redesign.
Different resolution
Different sampling rate
Different package footprint
Different digital interface
Parts at a glance
Part B
ADS7807U/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 8478 PCS
- Package
- SOIC-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7807U/1K | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 16 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit part offers far finer quantization than a 12-bit part. |
| Sampling Rate | 200 kSPS | 40 kSPS | Maximum throughput dictates how fast the system can acquire signals; the ADS7816U samples much faster while the ADS7807U trades speed for higher resolution. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the sensor or signal source must be connected; both are single-ended, but the surrounding analog front-end requirements differ with resolution and range. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Supply voltage must match the system rail; both operate from a 5 V supply, simplifying power-rail compatibility. |
| Interface | SPI / serial | Parallel | The digital interface determines microcontroller pin count and firmware; SPI needs few pins while parallel offers faster bus access but requires many I/O lines. |
| Package | SOIC-8 | SOIC-28 | Package footprint and pin count affect PCB layout and board space; these parts are not drop-in compatible due to very different package sizes. |
| Reference | External | Internal | Reference source affects accuracy and external component count; the ADS7807U includes an internal reference while the ADS7816U requires an external one. |
| Input Voltage Range | 0 V to VREF | ±10 V (bipolar) | Input range determines signal conditioning needs; the ADS7807U accepts bipolar ±10 V signals directly, while the ADS7816U is limited to a unipolar reference-based range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7816U | ADS7807U/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| 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, 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 ADS7807U/1K?
The ADS7816U is a 12-bit, 200-kSPS micropower sampling ADC with a pseudo-differential input and serial interface, while the ADS7807U/1K is a 16-bit, 40-kSPS sampling ADC with a successive-approximation register architecture and a parallel interface. They differ in resolution, throughput, interface type, and package.
Do the ADS7816U and ADS7807U/1K have the same resolution?
No. The ADS7816U provides 12-bit resolution, whereas the ADS7807U/1K provides 16-bit resolution.
How do the sampling rates of the ADS7816U and ADS7807U/1K compare?
The ADS7816U supports a maximum sampling rate of 200 kSPS, while the ADS7807U/1K supports a maximum sampling rate of 40 kSPS.
What interface types do the ADS7816U and ADS7807U/1K use?
The ADS7816U uses a serial interface, while the ADS7807U/1K uses a parallel interface.
Are the ADS7816U and ADS7807U/1K pin-compatible or package-compatible?
No. The ADS7816U is supplied in an 8-pin SOIC package, and the ADS7807U/1K is supplied in a 28-pin SOIC package. The pin counts, pin functions, and package dimensions differ, so they are not direct drop-in replacements.
Can the ADS7816U be used as a direct replacement for the ADS7807U/1K in an existing design?
No. Because the two devices differ in resolution, sampling rate, interface type, and package, a direct replacement is not possible without redesigning the interface, PCB layout, and system timing.
What input configuration does the ADS7816U support compared with the ADS7807U/1K?
The ADS7816U provides a pseudo-differential input configuration, while the ADS7807U/1K is a complete 16-bit sampling ADC with a specified input range and parallel output architecture. Designers should verify the exact input configuration against the respective manufacturer datasheets.
Which device is better suited for low-power, space-constrained designs?
The ADS7816U is generally more suitable for low-power and space-constrained designs because it is a micropower 12-bit ADC in an 8-pin SOIC package, whereas the ADS7807U/1K is a 16-bit device in a larger 28-pin SOIC package.