Part A
ADS8320E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 4183 PCS
- Package
- VSSOP-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8321E/2K5G4 is a functionally compatible replacement candidate for the ADS8320E/2K5, sharing the same 16-bit SAR architecture, SPI interface, and MSOP-8 footprint, with the primary distinction being a higher maximum sampling rate on the ADS8321. Designers should validate timing margins and supply decoupling in the target application before qualifying the substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Digital Interface
High match
Sampling Rate
Validation required
Parts at a glance
Part B
ADS8321E/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 6926 PCS
- Package
- TSSOP-8
- 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 | ADS8320E/2K5 | ADS8321E/2K5G4 | 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 | 100 kSPS | 100 kSPS | Identical throughput means either part can meet the same acquisition timing requirements. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Same supply range allows drop-in use in the same power rail design. |
| Input Type | Single-ended (pseudo-differential) | Single-ended (pseudo-differential) | Matching input configuration ensures the same signal conditioning front-end can be reused. |
| Interface | SPI (serial) | SPI (serial) | Identical serial interface means firmware and digital host connections remain compatible. |
| Package | 8-pin VSSOP (MSOP) | 8-pin VSSOP (MSOP) | Same package footprint allows direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness. |
| Reference Input | External reference | External reference | Both require an external reference, so the same reference circuit can be shared. |
| Power Consumption (typical) | ~1.8 mW at 100 kSPS, 5 V | ~1.8 mW at 100 kSPS, 5 V | Equivalent power draw means thermal and supply budgeting remain unchanged. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8320E/2K5 | ADS8321E/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential, Single Ended | Differential, 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 |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS8320E/2K5 and ADS8321E/2K5G4?
The ADS8320E/2K5 and ADS8321E/2K5G4 are both 16-bit, micropower, sampling analog-to-digital converters from Texas Instruments in an MSOP-8 package, but they differ in maximum sampling rate and packaging/ordering format. The ADS8320 supports a maximum throughput of 100 kSPS, while the ADS8321 supports up to 200 kSPS. The ADS8320E/2K5 is supplied in a 2,500-unit tape-and-reel (suffix /2K5), and the ADS8321E/2K5G4 is supplied in a 2,500-unit tape-and-reel with the G4 lead-free/RoHS-compliant designation.
Are the ADS8320E/2K5 and ADS8321E/2K5G4 pin-compatible?
Yes. Both devices are offered in the same 8-pin MSOP (VSSOP) package with the same pin functions, so they are pin-compatible. However, because the ADS8321 offers a higher maximum sampling rate, the surrounding circuit and digital interface timing should be validated against the respective datasheet before substituting one for the other.
What is the resolution and architecture of these ADCs?
Both the ADS8320 and ADS8321 are 16-bit successive-approximation-register (SAR) analog-to-digital converters. They provide a full 16-bit resolution over a specified input range and are designed for micropower, high-speed data acquisition applications.
What supply voltage and power consumption do these devices require?
Both devices operate from a single supply in the range of 2.7 V to 5.25 V. Their micropower SAR architecture results in low power consumption, making them suitable for battery-powered and portable instrumentation. For exact quiescent and operating current specifications, refer to the respective Texas Instruments datasheets.
What is the difference between the /2K5 and /2K5G4 ordering suffixes?
The /2K5 suffix indicates a 2,500-unit tape-and-reel packaging quantity. The G4 suffix on the ADS8321E/2K5G4 denotes a lead-free (Pb-free) and RoHS-compliant construction per Texas Instruments' green-material designation. Both are supplied in the same 2,500-unit reel format; the G4 designation addresses environmental compliance rather than electrical performance.
What interface do these ADCs use to communicate with a host processor?
Both the ADS8320 and ADS8321 use a serial interface compatible with SPI and similar synchronous serial protocols. The interface includes a chip-select, serial clock, and serial data output, allowing direct connection to most microcontrollers and DSPs. The maximum serial clock rate and timing parameters should be checked against the specific device datasheet.
Can the ADS8321E/2K5G4 be used as a drop-in replacement for the ADS8320E/2K5?
Because both parts share the same 8-pin MSOP package and pinout, the ADS8321E/2K5G4 can generally serve as a higher-speed replacement for the ADS8320E/2K5, provided the host interface and timing are validated for the higher 200 kSPS throughput. The ADS8320E/2K5 should not be substituted where the design requires the full 200 kSPS rate of the ADS8321, since the ADS8320 is limited to 100 kSPS.