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 ADS7816UCG4 are both 12-bit micropower SAR analog-to-digital converters from Texas Instruments sharing a compatible serial interface and supply range, making the ADS7822U a viable functional replacement candidate for the ADS7816UCG4 in many designs. However, the two devices differ in package footprint and sampling architecture, so layout and timing validation are recommended before substitution.
Resolution and ADC Architecture
High match
Supply Voltage Range
High match
Package and Pin Configuration
Validation required
Sampling Rate and Interface Timing
Validation required
Parts at a glance
Part B
ADS7816UCG4
Burr Brown
- Lifecycle
- Active
- Stock
- 4028 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 | ADS7816UCG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide the same 12-bit resolution, so measurement granularity is equivalent. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel ADCs, so the number of measurable signals per device is the same. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical maximum throughput means both can handle the same signal bandwidth and timing requirements. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow either part to operate in the same system power rail without redesign. |
| Interface Type | SPI (serial) | SPI (serial) | Both use a compatible serial interface, so the same microcontroller or DSP host connection can be reused. |
| Input Type | Single-ended, pseudo-differential | Single-ended, pseudo-differential | Same input configuration means the analog front-end and signal conditioning can remain unchanged. |
| Package / Mounting | SOIC-8, surface mount | VSSOP-8, surface mount | Different package footprints require PCB layout changes, affecting drop-in substitutability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts suit the same environmental conditions. |
| Reference Type | External | External | Both require an external reference, so the reference circuit design can be shared between them. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7822U | ADS7816UCG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| 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 ADS7816UCG4?
The ADS7822U is a 12-bit, 200-kSPS micropower sampling ADC in an SOIC-8 package, while the ADS7816UCG4 is a 12-bit, 200-kSPS micropower sampling ADC in a VSSOP-8 (MSOP-8) package. Both share the same resolution and throughput, but differ in package type and some electrical specifications such as supply current and input voltage range.
Do the ADS7822U and ADS7816UCG4 have the same pinout?
Both devices are offered in 8-pin packages with a similar pin function assignment (VDD, GND, CS/SHDN, DOUT, DIN, DCLOCK, and analog input pins). However, the ADS7822U uses an SOIC-8 package and the ADS7816UCG4 uses a VSSOP-8 package, so PCB land patterns differ even though the functional pin assignments are comparable. Designers should verify pin functions against the respective datasheets before layout.
Are the ADS7822U and ADS7816UCG4 interchangeable in an existing design?
They are not drop-in replacements because they use different package footprints (SOIC-8 vs VSSOP-8). Electrical similarities exist (both 12-bit, 200-kSPS, micropower, serial interface), but the package difference requires a PCB layout change. Any substitution should be validated against both datasheets for supply voltage, reference, and timing requirements.
What is the resolution and sampling rate of these ADCs?
Both the ADS7822U and ADS7816UCG4 are 12-bit successive-approximation ADCs with a maximum sampling rate of 200 kSPS, as specified in their respective manufacturer datasheets.
What supply voltage range do the ADS7822U and ADS7816UCG4 support?
Both devices operate from a single supply in the 2.7 V to 5.25 V range, per their datasheets, making them suitable for low-power, single-supply systems.
What serial interface do these ADCs use?
Both the ADS7822U and ADS7816UCG4 use a synchronous serial (SPI-compatible) interface with CS/SHDN, DCLOCK, DIN, and DOUT signals, allowing direct connection to most microcontrollers and DSPs.
How do the power consumption figures compare?
Both parts are micropower CMOS ADCs. The ADS7822U datasheet specifies a typical supply current of approximately 320 µA at 200 kSPS and 5 V, while the ADS7816UCG4 datasheet specifies a typical supply current of approximately 250 µA at 200 kSPS and 5 V. Actual values should be confirmed from the latest manufacturer datasheets for the specific operating conditions.
Which package options are available for each device?
The ADS7822U is supplied in an SOIC-8 package. The ADS7816UCG4 is supplied in a VSSOP-8 (MSOP-8) package. Package selection affects board space and thermal/assembly considerations.