Part A
ADS7822U
Texas Instruments
- Lifecycle
- Active
- Stock
- 7079 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7822U and ADS7816UC/2K5G4 are both 12-bit micropower SAR analog-to-digital converters in an 8-pin SOIC package with a serial interface, making them strong functional replacement candidates. The ADS7822U offers a faster maximum sample rate and a wider supply range, while the ADS7816UC/2K5G4 provides a slightly lower typical supply current. Designers should validate timing, reference, and interface details against the target application before substituting.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage Range
High match
Sample Rate and Interface Timing
Validation required
Parts at a glance
Part B
ADS7816UC/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7868 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 | ADS7822U | ADS7816UC/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide the same 12-bit resolution, so quantization step size and achievable accuracy are equivalent. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Identical single-channel architecture means both fit the same signal-acquisition topology without multiplexing changes. |
| Sampling Rate | 200 kSPS | 200 kSPS | Matching maximum throughput allows either part to support the same data-acquisition bandwidth requirements. |
| Interface Type | SPI / Microwire (serial) | SPI / Microwire (serial) | Same serial interface protocol ensures drop-in compatibility with the host microcontroller or DSP firmware. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Equivalent supply range means both operate from the same rails, including 3.3 V and 5 V systems. |
| Input Voltage Range | 0 V to VREF (unipolar) | 0 V to VREF (unipolar) | Same unipolar input span relative to the reference allows identical analog front-end scaling. |
| Reference Type | External | External | Both require an external reference, so the same reference source and decoupling can be reused. |
| Package / Mounting | 8-SOIC, surface mount | 8-SOIC, surface mount | Identical package and footprint permit direct PCB replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature rating means both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7822U | ADS7816UC/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Differential |
| 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 |
| 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 ADS7816UC/2K5G4?
The ADS7822U is a 12-bit, 200-kSPS micropower sampling ADC with a pseudo-differential input, while the ADS7816UC/2K5G4 is a 12-bit, 200-kSPS micropower sampling ADC with a single-ended input. Both are pin-compatible 8-pin SOIC devices from Texas Instruments, but the ADS7822U supports pseudo-differential input configuration and offers a power-down mode, whereas the ADS7816UC/2K5G4 is specified for single-ended input only. The ADS7816UC/2K5G4 is supplied in a 2,500-unit tape-and-reel (the "2K5G4" suffix denotes reel packaging and green/RoHS compliance).
Are the ADS7822U and ADS7816UC/2K5G4 pin-compatible?
Yes. Both devices are offered in an 8-pin SOIC (D) package with the same pinout: VDD, CS/SHDN, VIN+/VIN− (ADS7822U) or VIN (ADS7816), GND, DOUT, SCLK, and REF. Because the pin functions align, the ADS7816UC/2K5G4 can be used in place of the ADS7822U in many single-ended applications, but the pseudo-differential input capability of the ADS7822U is not available on the ADS7816.
Do both parts have the same resolution and sampling rate?
Yes. Both the ADS7822U and ADS7816UC/2K5G4 are 12-bit successive-approximation ADCs with a maximum sampling rate of 200 kSPS. Both operate from a single 2.7 V to 5.25 V supply and feature a micropower design with automatic power-down after conversion.
What is the difference in input configuration between the two devices?
The ADS7822U provides a pseudo-differential input pair (VIN+ and VIN−), allowing it to reject small common-mode signals and measure differential voltages within the input range. The ADS7816UC/2K5G4 has a single-ended input (VIN) referenced to GND. For applications requiring differential or common-mode rejection, the ADS7822U is the appropriate choice; for simple single-ended sensing, the ADS7816UC/2K5G4 is sufficient.
What does the "2K5G4" suffix on ADS7816UC/2K5G4 indicate?
The "2K5" denotes tape-and-reel packaging in quantities of 2,500 units, and "G4" indicates the device is RoHS-compliant and green (lead-free) per Texas Instruments ordering nomenclature. The ADS7822U is typically supplied in tube or reel packaging depending on the ordering part number; designers should confirm the specific orderable suffix for reel quantity and RoHS status.
Can the ADS7816UC/2K5G4 directly replace the ADS7822U in an existing design?
In single-ended applications where the ADS7822U's VIN− pin is tied to GND, the ADS7816UC/2K5G4 is functionally compatible and can typically be substituted, since both share the same package, pinout, resolution, sampling rate, and supply range. However, if the design relies on the ADS7822U's pseudo-differential input or its specific power-down timing, the substitution should be validated against the respective datasheets before production.
What are the power supply and reference requirements for these ADCs?
Both the ADS7822U and ADS7816UC/2K5G4 operate from a single supply of 2.7 V to 5.25 V and use an external reference applied to the REF pin, which sets the full-scale input range. The reference voltage must be stable and within the specified range relative to VDD. Both devices feature low power consumption with automatic shutdown between conversions, making them suitable for battery-powered and portable instrumentation.
Which device is better suited for battery-powered applications?
Both devices are micropower 12-bit ADCs with automatic power-down and are well suited to battery-powered systems. The ADS7822U offers the added flexibility of a pseudo-differential input and a shutdown mode, which can be advantageous when common-mode rejection or lower standby current is required. The ADS7816UC/2K5G4 provides a simpler single-ended input and is equally suitable where differential measurement is not needed. Selection should be based on input configuration and system-level power budget verified from the respective datasheets.