Part A
ADS7807U
Texas Instruments
- Lifecycle
- Active
- Stock
- 7038 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7804UB/1K is a viable functional replacement candidate for the ADS7807U, sharing the same 12-bit SAR architecture, 5V supply, and 28-pin SOIC footprint, though the designer must validate the faster 10 µs conversion time, the narrower 0–5V input range, and the absence of the internal reference buffer before committing to a drop-in substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Input Voltage Range
Validation required
Conversion Speed
Validation required
Parts at a glance
Part B
ADS7804UB/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 4479 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit Analog to Digital Converters (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 | ADS7804UB/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest signal change the ADC can distinguish; a 16-bit device provides 16x finer quantization than a 12-bit device, so they are not functionally interchangeable in precision applications. |
| Sampling Rate | 40 kSPS | 100 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7804 supports faster sampling, which matters for higher-frequency or multiplexed acquisition systems. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the analog source must be connected; both are single-ended, so the interface topology is compatible. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both operate from a single 5 V supply, simplifying power design compatibility. |
| Interface | Parallel | Parallel | The digital interface determines how the ADC connects to a host processor; both use a parallel interface, so bus wiring is similar. |
| Package | 28-SOIC | 28-SOIC | Package and pinout affect board layout and drop-in compatibility; matching SOIC packages allow reuse of the same footprint. |
| Integral Nonlinearity (INL) | ±2 LSB (max) | ±0.5 LSB (max) | INL measures deviation from an ideal transfer function; tighter INL improves absolute accuracy, and the specified grades differ significantly. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the part is guaranteed to meet specifications; identical ranges mean equivalent environmental suitability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7804UB/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | 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 ADS7804UB/1K?
The ADS7807U is a 16-bit successive-approximation ADC, while the ADS7804UB/1K is a 12-bit successive-approximation ADC. Both are pin-compatible 28-pin SOIC devices from Texas Instruments with similar sampling architectures, but they differ in resolution, linearity specifications, and dynamic performance. The ADS7807U offers higher resolution (16-bit) for applications requiring finer measurement granularity, whereas the ADS7804UB/1K provides 12-bit resolution with a faster full-scale settling characteristic and is typically selected where 12-bit accuracy is sufficient.
Are the ADS7807U and ADS7804UB/1K pin-compatible and package-compatible?
Yes. Both devices are offered in a 28-pin SOIC (DW) package with the same pinout, allowing them to share a common PCB footprint. However, designers must verify that the surrounding analog front-end, reference, and digital interface circuitry meet the requirements of the selected resolution grade before substituting one for the other.
What are the resolution and sampling rate specifications for each device?
The ADS7807U provides 16-bit resolution with a maximum sampling rate of 40 kSPS. The ADS7804UB/1K provides 12-bit resolution with a maximum sampling rate of 100 kSPS. The higher throughput of the ADS7804UB/1K suits faster control loops, while the ADS7807U targets precision measurement applications where 16-bit resolution is required.
How do the input voltage ranges of the ADS7807U and ADS7804UB/1K compare?
Both converters accept bipolar input ranges of ±10 V and ±5 V, as well as a unipolar 0 V to 10 V range, configured via external pin strapping. This common input range flexibility allows both devices to interface with similar industrial signal-conditioning front ends.
Do the ADS7807U and ADS7804UB/1K use the same digital interface?
Yes. Both devices provide a parallel digital output interface with a similar pin configuration, including chip-select, read, and convert-start control signals. The data bus width differs according to resolution (16-bit for the ADS7807U versus 12-bit for the ADS7804UB/1K), so the host processor or FPGA must be configured for the corresponding bus width.
What are the linearity and accuracy differences between the two converters?
The ADS7807U specifies 16-bit no-missing-code performance with integral nonlinearity (INL) and differential nonlinearity (DNL) appropriate to a 16-bit converter. The ADS7804UB/1K specifies 12-bit no-missing-code performance with INL and DNL specified for 12-bit resolution. Designers should consult the respective datasheets for the exact grade-specific INL, DNL, offset, and gain error limits before finalizing a design.
Can the ADS7804UB/1K be used as a drop-in replacement for the ADS7807U in an existing design?
Although the devices are pin-compatible, a direct drop-in replacement is not recommended without validation. The resolution difference (12-bit versus 16-bit) changes the digital output data format and the effective LSB size, which affects system calibration, scaling, and software. The designer must confirm that 12-bit resolution meets the application's accuracy budget and update the digital interface and calibration routines accordingly.
What are the typical applications for each device?
The ADS7807U is typically used in precision industrial measurement, instrumentation, and data-acquisition systems requiring 16-bit resolution. The ADS7804UB/1K is commonly used in industrial process control, motor control, and monitoring systems where 12-bit resolution and a 100 kSPS throughput are sufficient. Both are suited to bipolar industrial signal chains using ±10 V or ±5 V inputs.