Part A
ADS7822U
Texas Instruments
- Lifecycle
- Active
- Stock
- 7079 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7822U and ADS7813U/1K are both 12-bit successive-approximation ADCs, but they differ in resolution-critical architecture, sampling rate, interface timing, and package footprint, so the ADS7822U cannot serve as a direct drop-in substitute for the ADS7813U/1K without design validation.
Different sampling rate
Different interface timing
Different package footprint
Different supply configuration
Parts at a glance
Part B
ADS7813U/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 2270 PCS
- Package
- SOIC-16
- 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 | ADS7822U | ADS7813U/1K | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 16 bit | Resolution determines the smallest analog 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 | 75 kSPS | 40 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7822U samples faster while the ADS7813U trades speed for higher resolution. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the sensor or signal source must be connected; both are single-ended, so wiring topology is compatible. |
| Interface | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both use a serial SPI-compatible interface, easing drop-in replacement at the digital side. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V (4.75 V to 5.25 V) | Supply range determines compatibility with the system rail; the ADS7822U supports low-voltage 3.3 V systems while the ADS7813U requires a 5 V supply. |
| Package | SOIC-8 | SOIC-16 | Footprint and pin count must match the PCB layout; the different package sizes mean the two parts are not board-level drop-in replacements. |
| Reference | External | External | Reference architecture affects accuracy and design complexity; both require an external voltage reference, so the reference circuit approach is similar. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet spec; identical ranges mean equal environmental suitability. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7822U | ADS7813U/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 12 | 16 |
| Sampling Rate(Per Second) | 200k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Single Ended |
| Data Interface | SPI | 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 | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | microPOWER™ | - |
Frequently asked questions
What are the key differences between the ADS7822U and ADS7813U/1K?
The ADS7822U is a 12-bit, 200-kSPS micropower sampling ADC with a pseudo-differential input, SPI-compatible serial interface, and a 2.7-V to 5.25-V supply range, offered in an SOIC-8 package. The ADS7813U/1K is a 16-bit, 40-kSPS sampling ADC with a successive-approximation architecture, a ±10-V input range, and a 5-V supply, offered in an SOIC-16 package and supplied in tape-and-reel (1K) format. They differ in resolution, throughput, input range, supply, and package.
Can the ADS7822U be used as a drop-in replacement for the ADS7813U/1K?
No. The two devices differ in resolution (12-bit vs 16-bit), sampling rate (200 kSPS vs 40 kSPS), input configuration (pseudo-differential vs ±10-V single-ended), supply voltage, and package/pinout (SOIC-8 vs SOIC-16). A direct drop-in replacement is not possible without redesigning the circuit and validating against the respective datasheets.
What are the supply voltage requirements for each device?
The ADS7822U operates from a single supply of 2.7 V to 5.25 V, making it suitable for low-power and battery-operated systems. The ADS7813U/1K operates from a 5-V supply. Designs must ensure the supply rail and decoupling meet the requirements specified in each manufacturer datasheet.
How do the serial interfaces of the ADS7822U and ADS7813U/1K compare?
Both devices provide a serial digital interface for connection to microcontrollers and DSPs. The ADS7822U uses an SPI-compatible serial interface. The ADS7813U/1K also provides a serial interface for its 16-bit output data. The exact timing, clock requirements, and data format should be verified against the respective datasheets before interfacing.
What are the input voltage ranges of the ADS7822U and ADS7813U/1K?
The ADS7822U features a pseudo-differential input with a range set by the reference voltage, typically 0 V to VREF. The ADS7813U/1K provides a ±10-V input range. The input range difference is significant and affects signal conditioning and reference design in the target application.
What package and ordering options are available for these parts?
The ADS7822U is supplied in an SOIC-8 package. The ADS7813U/1K is supplied in an SOIC-16 package, with the "/1K" suffix indicating tape-and-reel packaging in quantities of 1,000 units. Package footprint and pin count differ, so PCB layout must be designed accordingly.
Which device is better suited for high-resolution, low-speed measurements?
The ADS7813U/1K is better suited for high-resolution, low-speed measurements because it offers 16-bit resolution at up to 40 kSPS with a ±10-V input range. The ADS7822U offers 12-bit resolution at up to 200 kSPS, making it more appropriate for higher-speed, lower-resolution, low-power applications.
Which device is more appropriate for low-power portable applications?
The ADS7822U is more appropriate for low-power portable applications due to its micropower operation and wide 2.7-V to 5.25-V supply range. The ADS7813U/1K requires a 5-V supply and is oriented toward higher-resolution industrial measurement rather than micropower portable designs.