Part A
ADS7822U
德州儀器
- Lifecycle
- Active
- Stock
- 7079 件
- Package
- SOIC-8
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS7822U and ADS7800KUG4 differ fundamentally in resolution, architecture, and package, so the ADS7800KUG4 cannot serve as a direct substitute for the ADS7822U in existing designs. A replacement would require a full redesign of the signal chain, timing, and board layout.
Different resolution
Different architecture
Different package
Different interface timing
Parts at a glance
Part B
ADS7800KUG4
德州儀器
- Lifecycle
- Active
- Stock
- 2642 件
- Package
- SOIC-24
- Series
- 資料獲取-模數轉換器（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 | ADS7800KUG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Sampling Rate | 75 kSPS | 333 kSPS | The ADS7800KUG4 supports a much higher throughput, which matters for higher-bandwidth signal acquisition. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning topology can remain similar. |
| Interface | SPI / serial | Parallel | The digital interface differs significantly; a parallel interface requires more host pins and different firmware than SPI. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V (single supply) | The ADS7822U supports lower supply voltages, enabling use in low-power 3.3 V systems where the ADS7800KUG4 would not operate. |
| Package | SOIC-8 | SOIC-28 | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental compatibility is comparable. |
| Power Consumption | Low power (micropower class) | Higher power (hundreds of mW class) | The ADS7822U is suited to battery-powered or power-sensitive designs, while the ADS7800KUG4 draws substantially more current. |
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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 | ADS7800KUG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 333k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Single Ended |
| Data Interface | 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 |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 5V, -11.4V ~ 16.5V |
| 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 architectural differences between the ADS7822U and ADS7800KUG4?
The ADS7822U is a 12-bit micropower successive-approximation register (SAR) analog-to-digital converter with a pseudo-differential input, operating from a single 2.7 V to 5.25 V supply and featuring a synchronous serial (SPI-compatible) interface. The ADS7800KUG4 is a 12-bit successive-approximation ADC with a parallel 12-bit output interface, operating from a single 5 V supply with an internal reference and sample-and-hold. The ADS7822U targets low-power, space-constrained designs, while the ADS7800KUG4 targets higher-throughput parallel-bus systems.
Do the ADS7822U and ADS7800KUG4 have compatible package footprints?
No. The ADS7822U is supplied in an 8-pin SOIC (D) package, whereas the ADS7800KUG4 is supplied in a 28-pin SOIC (DB) package. The pin counts, pin functions, and PCB land patterns differ, so the two devices are not footprint-compatible and cannot be interchanged on the same board without a redesign.
How do the digital interfaces of the ADS7822U and ADS7800KUG4 differ?
The ADS7822U provides a synchronous serial interface (SPI/QSPI/MICROWIRE-compatible) with data clocked out on DCLOCK and framed by CS/SHDN, making it suitable for microcontrollers with serial peripherals. The ADS7800KUG4 provides a parallel 12-bit output bus with associated control signals (e.g., CS, R/C, BUSY), suited to systems with a parallel data bus. The interface architectures are not directly interchangeable.
What are the supply voltage and power consumption differences between the ADS7822U and ADS7800KUG4?
The ADS7822U operates from a single supply of 2.7 V to 5.25 V and is specified for micropower operation, with typical supply current in the microampere range at low sample rates (down to 75 µA typical at 5 V in power-down mode per the datasheet). The ADS7800KUG4 operates from a single 5 V supply and consumes substantially more power, with typical supply current in the tens of milliamperes range. The ADS7822U is therefore preferred for battery-powered or low-power applications.
Can the ADS7822U and ADS7800KUG4 be used interchangeably in an existing design?
No. Beyond the differing package footprints and pin counts, the two devices use different digital interfaces (serial versus parallel), different supply requirements, and different external component needs. A direct substitution is not possible; any replacement requires schematic and layout changes plus validation against the manufacturer datasheets.
What are the input configurations of the ADS7822U and ADS7800KUG4?
The ADS7822U features a pseudo-differential input with an input range of 0 V to VREF, where the negative input can be biased above ground. The ADS7800KUG4 provides a single-ended input with an internal sample-and-hold and an internal reference, with a specified input range per its datasheet. The input topologies and reference arrangements differ, so signal-conditioning circuitry must be designed accordingly.
Which device is better suited for low-power portable applications?
The ADS7822U is better suited for low-power portable applications. Its single-supply operation from 2.7 V to 5.25 V, micropower SAR architecture, and serial interface reduce board space and power consumption compared with the ADS7800KUG4, which requires a 5 V supply, a parallel bus, and a larger 28-pin package. Selection should still be confirmed against the specific sampling-rate and accuracy requirements in the respective datasheets.