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 ADS7817U/2K5 is a functionally compatible replacement candidate for the ADS7807U, sharing the same 12-bit SAR architecture, serial interface, and SOIC-8 footprint, though the ADS7807U offers a wider supply range and higher throughput that must be validated against the target application's timing and voltage requirements.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage Range
Validation required
Sampling Rate
Validation required
Parts at a glance
Part B
ADS7817U/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 3745 PCS
- Package
- SOIC-8
- 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 | ADS7817U/2K5 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest signal change the ADC can distinguish; a 16-bit part offers 16x finer quantization than a 12-bit part, so they are not functionally interchangeable in precision applications. |
| Sampling Rate | 40 kSPS | 200 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the faster part supports higher-frequency inputs and faster system update rates. |
| Input Type | Single-ended | Pseudo-differential | Input configuration affects how the signal source must be connected and the ability to reject common-mode noise; single-ended and pseudo-differential front ends are not directly interchangeable. |
| Interface | Parallel | SPI / Serial | The digital interface must match the host controller; a parallel interface requires many GPIO lines while a serial interface uses few pins, so board layout and firmware differ significantly. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both parts operate from a 5 V supply, so power-rail compatibility is maintained. |
| Package | SOIC-28 | SOIC-8 | Package footprint and pin count determine PCB layout compatibility; a 28-pin and an 8-pin package cannot be dropped into the same footprint. |
| Reference | Internal reference | External reference | Reference architecture affects accuracy, drift, and external component count; an internal reference simplifies design while an external reference allows the user to set the full-scale range. |
| Power Consumption | ~100 mW | ~4 mW | Power dissipation impacts thermal design and battery life; the lower-power part is preferable for portable or thermally constrained systems. |
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 | ADS7807U | ADS7817U/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 200k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Differential |
| Data Interface | SPI, Parallel | SPI |
| 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 |
| 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 ADS7817U/2K5?
The ADS7807U is a 16-bit successive-approximation ADC, while the ADS7817U/2K5 is a 12-bit successive-approximation ADC. Both are offered in a 28-pin SOIC package by Texas Instruments, but they differ in resolution, sampling rate, and analog input configuration. The ADS7807U provides 16-bit resolution at up to 40 kSPS, whereas the ADS7817U/2K5 provides 12-bit resolution at up to 200 kSPS.
Are the ADS7807U and ADS7817U/2K5 pin-compatible?
No. Although both devices are packaged in a 28-pin SOIC (DW) package, their pin functions and internal architectures differ. The ADS7807U is a 16-bit ADC with a parallel interface and internal reference, while the ADS7817U/2K5 is a 12-bit ADC with a serial interface. Pin assignments and signal functions are not interchangeable, so a direct drop-in replacement is not supported without design changes.
What are the resolution and sampling rate specifications for each device?
The ADS7807U offers 16-bit resolution with a maximum throughput of 40 kSPS. The ADS7817U/2K5 offers 12-bit resolution with a maximum throughput of 200 kSPS. These differences make the ADS7807U suited to higher-precision, lower-speed applications, while the ADS7817U/2K5 targets higher-speed, lower-resolution applications.
Do both devices support the same digital interface?
No. The ADS7807U provides a parallel digital output interface, whereas the ADS7817U/2K5 provides a serial (SPI-compatible) digital output interface. System designers must account for this difference in host controller interfacing, PCB routing, and firmware when comparing or substituting the two parts.
What are the analog input configurations of the ADS7807U and ADS7817U/2K5?
The ADS7807U features a fully differential analog input with a ±10 V input range (with appropriate reference and configuration). The ADS7817U/2K5 features a pseudo-differential analog input with a 0 V to VREF input range. These input configurations differ, so the analog front-end design must be matched to the selected device.
What are the supply voltage and reference requirements for each part?
Both the ADS7807U and ADS7817U/2K5 operate from a single +5 V analog supply. The ADS7807U includes an internal reference and also supports an external reference, while the ADS7817U/2K5 requires an external reference voltage (VREF) for its conversion range. Designers should verify reference configuration against the respective datasheets.
Can the ADS7817U/2K5 be used as a drop-in replacement for the ADS7807U in an existing design?
No. Because the two devices differ in resolution (12-bit vs 16-bit), digital interface (serial vs parallel), analog input configuration, and pin functions, the ADS7817U/2K5 cannot serve as a direct drop-in replacement for the ADS7807U. Any substitution requires revalidation of the analog front end, digital interface, firmware, and PCB layout against the target device datasheet.
What is the significance of the "2K5" suffix on the ADS7817U/2K5 part number?
The "2K5" suffix on the ADS7817U/2K5 denotes the tape-and-reel packaging quantity of 2,500 units per reel, as specified in Texas Instruments ordering information. It does not indicate a different silicon die, resolution, or performance grade compared with the base ADS7817U device.