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 ADS7825UE4 is a viable functional replacement candidate for the ADS7807U, sharing the same 16-bit SAR architecture, 5V supply, and SOIC-28 footprint. Designers must validate the higher 250 kSPS throughput, the additional input channel, and the differing external reference and interface configuration before committing to a drop-in substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Input Channel Configuration
Validation required
Parts at a glance
Part B
ADS7825UE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 5594 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 | ADS7825UE4 | 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 offers a 4-channel multiplexer while the ADS7807 is single-channel, affecting how many signals can be digitized without external muxing. |
| Sampling Rate | 40 kSPS | 40 kSPS | Identical throughput means both suit similar signal bandwidths; not a differentiator. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning requirements are comparable. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Both use a parallel interface, so host-side bus timing and pin count are similar. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Same supply simplifies power-rail design when substituting one for the other. |
| Package / Mounting | 28-SOIC (surface mount) | 28-SOIC (surface mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range means both are suitable for the same environmental conditions. |
| Reference | Internal reference | Internal reference | Both include an on-chip reference, reducing external component count similarly. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7825UE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| 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 differences between the ADS7807U and the ADS7825UE4?
The ADS7807U is a 16-bit successive-approximation ADC offering a 10 µs max conversion time and a 100 kHz min sampling rate, while the ADS7825UE4 is a 16-bit ADC with a 25 µs max conversion time and a 40 kHz min sampling rate. The ADS7825UE4 integrates a 4-channel input multiplexer, whereas the ADS7807U provides a single input channel. Both operate from a +5 V supply and are specified over the industrial temperature range.
Are the ADS7807U and ADS7825UE4 pin-compatible?
No. The ADS7807U is offered in a 28-pin SOIC package, while the ADS7825UE4 is offered in a 28-pin SOIC package but with a different pin function assignment due to the integrated 4-channel multiplexer on the ADS7825UE4. A direct drop-in replacement is not possible without verifying pin functions and PCB layout against the respective datasheets.
What is the maximum sampling rate of each device?
The ADS7807U supports a minimum sampling rate of 100 kHz with a maximum conversion time of 10 µs. The ADS7825UE4 supports a minimum sampling rate of 40 kHz with a maximum conversion time of 25 µs. The ADS7807U therefore offers higher throughput for single-channel applications.
Do both devices include an internal reference?
Yes. Both the ADS7807U and the ADS7825UE4 integrate an internal reference voltage, allowing ratiometric or absolute measurement configurations without an external reference in many applications. Designers should consult the respective datasheets for reference accuracy and drift specifications.
How do the input configurations differ between the two parts?
The ADS7807U provides a single analog input channel, making it suitable for single-channel data acquisition. The ADS7825UE4 includes a 4-channel input multiplexer, enabling it to sequentially convert up to four analog input signals. This makes the ADS7825UE4 preferable for multi-channel systems where board space is limited.
What are the supply voltage and power requirements for these ADCs?
Both the ADS7807U and the ADS7825UE4 operate from a single +5 V analog supply. Power consumption differs due to the different conversion architectures and throughput; designers should refer to the manufacturer datasheets for exact quiescent current and power dissipation figures under specified operating conditions.
Which device is better suited for multi-channel data acquisition systems?
The ADS7825UE4 is better suited for multi-channel data acquisition because it integrates a 4-channel input multiplexer, reducing external component count and board space. The ADS7807U, with its single input channel and faster conversion time, is better suited for high-throughput single-channel applications.