Part A
ADS8326IBDGKR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3322 PCS
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8326IBDGKR and ADS8318IBDGST are both 16-bit successive-approximation ADCs in the same VSSOP-8 package and share a compatible serial interface, making them a viable functional replacement candidate. However, the ADS8318IBDGST offers a significantly higher sampling rate and a wider supply range, while the ADS8326IBDGKR provides a pseudo-differential input and lower power consumption. Designers should validate the reference configuration, input architecture, and timing margins against the target application before substituting one for the other.
Resolution and Sample Rate
High match
Supply Voltage Range
Validation required
Input Configuration
Validation required
Package and Pinout
High match
Parts at a glance
Part B
ADS8318IBDGST
National Semiconductor
- Lifecycle
- Active
- Stock
- 6908 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS8326IBDGKR | ADS8318IBDGST | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 250 kSPS | 500 kSPS | The ADS8318 offers twice the throughput, which matters for higher-bandwidth signal acquisition. |
| Input Type | Pseudo-differential, single-ended | Fully differential | Differential input improves noise immunity and common-mode rejection; single-ended is simpler to drive. |
| Supply Voltage | 2.7 V to 5.5 V | 4.5 V to 5.5 V | The wider supply range of the ADS8326 allows operation at lower voltages, affecting system power design. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI interface, so digital host connectivity is compatible. |
| Package | VSSOP-8 (DGK) | VSSOP-10 (DGS) | Different pin counts and footprints mean the PCB layout must be redesigned for substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range, so environmental suitability is equivalent. |
| Reference Input | External reference | External reference | Both require an external voltage reference, so reference design considerations are similar. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8326IBDGKR | ADS8318IBDGST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | - | 500k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential, Single Ended | 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 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.375V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Base Product Number | ADS8326 | - |
| Sampling Rate (Per Second) | 250k | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tape & Reel (TR) | - |
Frequently asked questions
What are the key differences between the ADS8326IBDGKR and ADS8318IBDGST?
The ADS8326IBDGKR is a 16-bit, 250-kSPS micropower SAR ADC with a pseudo-differential input, SPI interface, and a VSSOP-8 (DGK) package. The ADS8318IBDGST is a 16-bit, 500-kSPS SAR ADC with a fully differential input, SPI interface, and a VSSOP-10 (DGS) package. The ADS8318 offers twice the throughput and a differential input architecture, while the ADS8326 targets lower-power, space-constrained designs.
Are the ADS8326IBDGKR and ADS8318IBDGST pin-compatible?
No. The ADS8326IBDGKR uses an 8-pin VSSOP (DGK) package, while the ADS8318IBDGST uses a 10-pin VSSOP (DGS) package. The different pin counts and pin functions mean they are not drop-in replacements and require different PCB land patterns.
How do the sampling rates of the ADS8326IBDGKR and ADS8318IBDGST compare?
The ADS8326IBDGKR supports a maximum throughput of 250 kSPS, whereas the ADS8318IBDGST supports up to 500 kSPS. The ADS8318 is therefore better suited for higher-bandwidth signal acquisition, while the ADS8326 is adequate for lower-speed, low-power applications.
What input configuration does each ADC support?
The ADS8326IBDGKR provides a pseudo-differential input, where the negative input is typically tied to a fixed reference or ground. The ADS8318IBDGST provides a fully differential input, which improves common-mode noise rejection and is preferable for driving from differential signal sources such as fully differential amplifiers.
How do the power consumption figures compare between the two devices?
The ADS8326IBDGKR is specified as a micropower SAR ADC, drawing significantly lower supply current at reduced throughput, making it suitable for portable and battery-powered systems. The ADS8318IBDGST, operating at up to 500 kSPS, consumes more power to support its higher sampling rate. Designers should consult the respective datasheets for exact supply current versus throughput curves.
Do both ADCs use the same digital interface?
Yes. Both the ADS8326IBDGKR and ADS8318IBDGST use an SPI-compatible serial interface for configuration and data readout, allowing connection to most microcontrollers and DSPs. However, the command set and timing details differ, so firmware must be adapted to the specific device.
Which part should be selected for a higher-throughput application?
For applications requiring sampling rates above 250 kSPS, the ADS8318IBDGST is the appropriate choice because it supports up to 500 kSPS. The ADS8326IBDGKR should be selected when 250 kSPS is sufficient and lower power or a smaller 8-pin package is prioritized.