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
Not a drop-in replacement
The ADS8320E/2K5 and ADS8318IBDGSTG4 differ fundamentally in resolution, sampling architecture, and digital interface, so they are not interchangeable in a common design. The ADS8318IBDGSTG4 offers higher resolution and throughput but requires a different serial interface and board layout, meaning any substitution demands full schematic and firmware revalidation rather than a direct swap.
Different resolution
Different sample rate
Different digital interface
Different package footprint
Parts at a glance
Part B
ADS8318IBDGSTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9660 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 | ADS8320E/2K5 | ADS8318IBDGSTG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate | 100 kSPS | 500 kSPS | The ADS8318 offers 5x higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Input Type | Single-ended | Differential (pseudo-differential) | Differential inputs improve noise immunity and common-mode rejection; single-ended is simpler for ground-referenced signals. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, so digital host connectivity is compatible. |
| Supply Voltage | 2.7 V to 5.5 V | 4.5 V to 5.5 V (analog), 2.7 V to 5.5 V (digital) | The ADS8320 supports lower supply voltages, enabling use in low-power 3.3 V systems where the ADS8318 cannot operate. |
| Package | VSSOP-8 (MSOP-8) | VSSOP-10 (MSOP-10) | Different pin counts and footprints mean the parts are not drop-in PCB replacements without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environmental conditions. |
| Reference Input | External reference | External reference | Both require an external voltage reference, so system reference design considerations are similar. |
| Power Consumption (typical) | ~1.8 mW at 100 kSPS, 5 V | ~18 mW at 500 kSPS, 5 V | The ADS8320 is significantly lower power, which matters for battery-powered or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8320E/2K5 | ADS8318IBDGSTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 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 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 2.375V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS8320E/2K5 and the ADS8318IBDGSTG4?
The ADS8320E/2K5 is a 16-bit, 100-kSPS micropower successive-approximation register (SAR) analog-to-digital converter from Texas Instruments, supplied in an 8-pin VSSOP package and specified for a 2.7-V to 5.25-V supply. The ADS8318IBDGSTG4 is a 16-bit, 500-kSPS SAR ADC from Texas Instruments in a 10-pin VSSOP package, specified for a 4.5-V to 5.5-V analog supply with a separate 2.7-V to 5.5-V digital supply. The ADS8318 offers a higher throughput rate and a dedicated digital I/O supply, while the ADS8320 targets lower power and wider single-supply operation.
Are the ADS8320E/2K5 and ADS8318IBDGSTG4 pin-compatible or footprint-compatible?
No. The ADS8320E/2K5 uses an 8-pin VSSOP (DGK) package, while the ADS8318IBDGSTG4 uses a 10-pin VSSOP (DGS) package. The pin counts and package body dimensions differ, so the PCB land patterns are not interchangeable and a direct drop-in replacement is not possible without a layout change.
How do the sampling rates and interface types of these two ADCs compare?
The ADS8320E/2K5 supports a maximum sampling rate of 100 kSPS and provides a serial SPI-compatible interface. The ADS8318IBDGSTG4 supports a maximum sampling rate of 500 kSPS and also provides an SPI-compatible serial interface. The ADS8318 therefore delivers five times the throughput of the ADS8320 for applications requiring faster conversion cycles.
What are the supply voltage and reference requirements for each device?
The ADS8320E/2K5 operates from a single supply of 2.7 V to 5.25 V and uses an external reference voltage applied to its VREF pin. The ADS8318IBDGSTG4 requires an analog supply (AVDD) of 4.5 V to 5.5 V, a digital supply (DVDD) of 2.7 V to 5.5 V, and an external reference voltage on its REF pin. Designs migrating between the two must verify that the available rails and reference source meet these ranges.
How do the power consumption figures of the ADS8320E/2K5 and ADS8318IBDGSTG4 compare?
The ADS8320E/2K5 is specified as a micropower SAR ADC with very low power consumption at its 100-kSPS rate, making it suitable for battery-powered and portable instrumentation. The ADS8318IBDGSTG4, operating at up to 500 kSPS with a 5-V analog supply, consumes proportionally more power to support its higher throughput. Exact power figures should be taken from the respective Texas Instruments datasheets for the specific operating conditions of the design.
Can the ADS8318IBDGSTG4 be used as a higher-speed upgrade to the ADS8320E/2K5?
Functionally it can serve as a higher-throughput 16-bit SAR converter, but it is not a drop-in upgrade. The ADS8318IBDGSTG4 requires a different package footprint (10-pin vs 8-pin VSSOP), a 4.5-V to 5.5-V analog supply, and a separate digital supply, whereas the ADS8320E/2K5 operates from a single 2.7-V to 5.25-V rail. A redesign of the power tree, reference circuit, and PCB layout is required before substituting one for the other.
What are the typical application targets for each of these ADCs?
The ADS8320E/2K5 is typically used in portable and battery-powered systems, data acquisition, and industrial process control where low power and a wide single-supply range are important. The ADS8318IBDGSTG4 is typically used in higher-speed data acquisition, medical instrumentation, and industrial measurement systems that require 16-bit resolution at up to 500 kSPS with a 5-V analog signal chain.