Part A
ADS7807U
Texas Instruments
- Lifecycle
- Active
- Stock
- 7038 PCS
- Package
- SOIC-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7825UB/1K can serve as a functional replacement candidate for the ADS7807U in many 16-bit ADC applications, but it is not a drop-in substitute. Both devices share a 16-bit SAR architecture and 5V supply, yet they differ in package footprint, sample rate, and interface timing, so board-level validation is required before committing to the swap.
Resolution and Architecture
High match
Package Type
Validation required
Sample Rate
Validation required
Digital Interface
Validation required
Parts at a glance
Part B
ADS7825UB/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 4144 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 | ADS7807U | ADS7825UB/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Number of Input Channels | 1 (single-ended) | 4 (single-ended, multiplexed) | The ADS7825 provides a 4-channel multiplexer, allowing multiple signals to be sampled by one device, whereas the ADS7807 is single-channel. |
| Sampling Rate | 40 kSPS | 40 kSPS | Identical throughput means both can handle the same signal bandwidth requirements. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning requirements are similar. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Both use a parallel interface, so the host microcontroller or DSP connection scheme is compatible. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Matching supply requirements simplify power supply design when substituting parts. |
| Package | 28-pin SOIC | 28-pin SOIC | Same package and pin count allow a drop-in footprint replacement on the PCB. |
| Internal Reference | Yes (on-chip reference) | Yes (on-chip reference) | Both include an internal reference, reducing external component count and simplifying design. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial application environments. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7825UB/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 40k | 40k |
| Number of Inputs | 1 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | 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, Internal | 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 ADS7807U and the ADS7825UB/1K?
The ADS7807U is a 16-bit successive-approximation register (SAR) analog-to-digital converter that operates from a single +5 V supply and features a parallel data interface. The ADS7825UB/1K is a 16-bit SAR ADC that operates from a single +5 V supply and provides a serial (SPI-compatible) data interface. Both are 16-bit SAR converters, but they differ in output interface (parallel versus serial) and package options.
Are the ADS7807U and ADS7825UB/1K pin-compatible or package-compatible?
No. The ADS7807U is offered in a 28-pin SOIC package, while the ADS7825UB/1K is offered in a 28-pin SOIC package as well, but the pin functions differ because one provides a parallel interface and the other a serial interface. Pin functions and PCB land patterns must be verified against the respective manufacturer datasheets before considering any substitution.
Do both devices support the same analog input voltage range?
Both the ADS7807U and ADS7825UB/1K are specified for a bipolar analog input range of ±10 V (with a ±10 V input span) when configured accordingly, operating from a single +5 V supply. Designers should confirm the exact input configuration and reference requirements in the respective datasheets, as the input range depends on the reference and configuration used.
What sampling rate do the ADS7807U and ADS7825UB/1K support?
Both the ADS7807U and ADS7825UB/1K are specified with a maximum throughput of 250 kSPS (kilo-samples per second) for 16-bit conversion. The actual achievable rate depends on the interface timing and the host system's ability to read the conversion results.
Can the ADS7825UB/1K be used as a drop-in replacement for the ADS7807U?
No, not as a direct drop-in replacement. Although both are 16-bit SAR ADCs from the same family, the ADS7807U uses a parallel output interface while the ADS7825UB/1K uses a serial interface, and their pinouts differ. A redesign of the digital interface and PCB layout would be required, and all timing and reference parameters must be validated against the manufacturer datasheets.
What are the operating temperature ranges for these two converters?
Both the ADS7807U and ADS7825UB/1K are specified for the industrial temperature range of −40 °C to +85 °C. This should be confirmed against the specific grade and datasheet revision for each part number before use in a design.
Which device is better suited for space-constrained or isolated designs?
The ADS7825UB/1K, with its serial (SPI-compatible) interface, typically requires fewer digital I/O lines and can simplify isolation and routing in space-constrained or isolated systems. The ADS7807U's parallel interface provides higher data throughput per conversion cycle but requires more host pins. Selection should be based on the system's interface, isolation, and throughput requirements.