Part A
ADS7809U
Texas Instruments
- Lifecycle
- Active
- Stock
- 6471 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7807UBE4 is a viable functional replacement candidate for the ADS7809U, sharing the same 16-bit SAR architecture, 5V supply, and 28-pin SOIC footprint, though the designer must validate the faster 35 kSPS throughput, the narrower 0.3–2.7 V input range, and the internal reference configuration against the target application requirements.
Resolution and Architecture
High match
Sampling Rate
Validation required
Analog Input Range
Validation required
Package and Pinout
High match
Parts at a glance
Part B
ADS7807UBE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 2303 PCS
- Package
- SOIC-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS7809U | ADS7807UBE4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 100 kSPS | 40 kSPS | The ADS7809U supports a higher throughput; systems needing faster conversion cannot directly substitute the slower ADS7807UBE4. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so signal conditioning topology remains compatible. |
| Input Voltage Range | ±10 V | ±10 V | Identical full-scale input range means the same front-end scaling can be reused. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Same single 5 V supply simplifies power rail design and allows drop-in power compatibility. |
| Interface | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Matching serial interface allows reuse of the same digital host connection and firmware. |
| Package | 28-pin SOIC | 28-pin SOIC | Same package and pinout enable direct PCB footprint compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature range supports use in the same environmental conditions. |
| INL (Integral Nonlinearity) | ±2 LSB (max) | ±2 LSB (max) | Matching linearity specifications indicate comparable accuracy performance for precision measurement applications. |
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 | ADS7809U | ADS7807UBE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | 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 ADS7809U and ADS7807UBE4?
The ADS7809U is a 16-bit successive-approximation ADC with a 10 µs conversion time and a parallel 16-bit output interface, specified for operation from a single +5 V supply. The ADS7807UBE4 is a 16-bit SAR ADC with a 10 µs conversion time and a serial (SPI-compatible) output interface, also operating from a single +5 V supply. The primary differences are the digital interface (parallel vs. serial) and the package/ordering variant indicated by the suffix.
Are the ADS7809U and ADS7807UBE4 pin-compatible?
No. The ADS7809U provides a parallel 16-bit data bus, while the ADS7807UBE4 provides a serial data output, so their pin functions and package pinouts differ. They are not direct drop-in replacements and require different PCB routing for the digital interface.
Do both devices operate from a single +5 V supply?
Yes. Both the ADS7809U and ADS7807UBE4 are specified for a single +5 V analog and digital supply, which simplifies system power design compared with dual-supply ADCs.
What is the resolution and conversion time of these ADCs?
Both the ADS7809U and ADS7807UBE4 are 16-bit successive-approximation ADCs with a specified conversion time of 10 µs, supporting sampling rates up to approximately 100 kSPS.
Which device should be selected for a system with a serial microcontroller interface?
The ADS7807UBE4 is the appropriate choice because it provides a serial output interface compatible with SPI-style hosts, reducing pin count and simplifying isolation. The ADS7809U's parallel interface is better suited to hosts with a wide parallel bus.
Can the ADS7809U and ADS7807UBE4 be used interchangeably in an existing design?
No. Because the digital interfaces differ (parallel vs. serial) and the pinouts are not identical, substituting one for the other requires PCB redesign and firmware changes. Interchangeability should only be considered after validating all differences against the respective manufacturer datasheets.
What input voltage range do these ADCs support?
Both the ADS7809U and ADS7807UBE4 are specified with a bipolar ±10 V input range, making them suitable for industrial signal acquisition where bipolar analog inputs are present.