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 ADS7807U and ADS7811U/1K are both 16-bit successive-approximation ADCs from Texas Instruments in a pin-compatible SOIC-28 package with an identical parallel interface and comparable speed grades, making the ADS7811U/1K a viable functional replacement candidate for the ADS7807U. Designers should validate the reference configuration, input range settings, and power-supply decoupling against the target board before committing to the substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Digital Interface
High match
Analog Input and Reference Configuration
Validation required
Parts at a glance
Part B
ADS7811U/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 6599 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 | ADS7811U/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate | 40 kSPS | 250 kSPS | The ADS7811U/1K offers a much higher throughput, which matters for higher-bandwidth signal acquisition. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so input configuration is compatible. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V supply, simplifying power-rail compatibility. |
| Interface | Parallel | Parallel | Both use a parallel digital interface, so the host-side connection scheme is similar. |
| Package | 28-SOIC | 28-SOIC | Identical package and pin count support drop-in board compatibility. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Matching industrial temperature ranges ensure equivalent environmental suitability. |
| Power Consumption | ~100 mW | ~250 mW | The ADS7811U/1K dissipates more power, which affects thermal design and energy budget. |
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 | ADS7811U/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 40k | 250k |
| 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 | -25°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7807U and the ADS7811U/1K?
The ADS7807U is a 16-bit, 40 kSPS successive-approximation ADC, while the ADS7811U/1K is a 16-bit, 250 kSPS successive-approximation ADC. The ADS7811U/1K offers a significantly higher sampling rate (250 kSPS vs 40 kSPS) and is supplied in a 28-pin SOIC package, whereas the ADS7807U is supplied in a 28-pin SOIC package as well. Both are 16-bit SAR converters from Texas Instruments with similar parallel interface architecture, but they differ in throughput, power consumption, and internal reference specifications.
Are the ADS7807U and ADS7811U/1K pin-compatible?
No, they are not pin-compatible. The ADS7807U and ADS7811U/1K are both 28-pin SOIC devices, but their pin functions and assignments differ. The ADS7811U/1K has a different pinout configuration for the digital interface, reference, and control signals compared to the ADS7807U. A direct drop-in replacement is not possible without PCB redesign and validation against the respective datasheets.
What is the maximum sampling rate of each device?
The ADS7807U has a maximum throughput of 40 kSPS. The ADS7811U/1K has a maximum throughput of 250 kSPS. The ADS7811U/1K is therefore suitable for higher-speed signal acquisition applications, while the ADS7807U targets lower-speed, precision measurement systems.
Do both devices provide a 16-bit parallel interface?
Yes. Both the ADS7807U and ADS7811U/1K provide a 16-bit parallel digital output interface for direct connection to microprocessors and DSPs. The interface timing, control signals, and read cycle characteristics differ between the two devices and must be verified against the respective manufacturer datasheets before substitution.
What are the analog input voltage ranges for these ADCs?
The ADS7807U supports a bipolar analog input range of ±10 V. The ADS7811U/1K supports a bipolar analog input range of ±10 V as well. Both devices are specified for bipolar input operation with an internal reference, but the reference accuracy, drift, and input impedance specifications differ and should be confirmed from the official Texas Instruments datasheets.
Can the ADS7811U/1K replace the ADS7807U in an existing design?
Not as a direct drop-in replacement. Although both are 16-bit SAR ADCs in 28-pin SOIC packages, they differ in pinout, maximum throughput (250 kSPS vs 40 kSPS), timing requirements, and power consumption. Any replacement requires schematic and layout changes, revalidation of the digital interface timing, and confirmation that the higher sampling rate and associated power/thermal characteristics are acceptable for the target system.
What is the significance of the "/1K" suffix on the ADS7811U/1K?
The "/1K" suffix on the ADS7811U/1K denotes a tape-and-reel packaging quantity of 1,000 units per reel, as specified in Texas Instruments ordering information. The base device designation ADS7811U identifies the 16-bit, 250 kSPS ADC in a 28-pin SOIC package; the suffix indicates the shipping format rather than a change in electrical specifications.