Part A
ADS8344E
Texas Instruments
- Lifecycle
- Active
- Stock
- 2647 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8344E and ADS831E/2K5G4 are not drop-in replacements for one another. The ADS8344E is a 16-bit, 4-channel successive-approximation ADC with a serial SPI/QSPI interface in a 20-pin SSOP package, while the ADS831E/2K5G4 is a 16-bit, single-channel pipelined ADC with a parallel interface in a 48-pin TQFP package. Their channel count, digital interface, package footprint, and sampling architecture differ fundamentally, so a direct board-level substitution is not feasible without redesign.
Different channel count
Different output interface
Different package footprint
Different converter architecture
Parts at a glance
Part B
ADS831E/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 5791 PCS
- Package
- SSOP-20
- 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 | ADS8344E | ADS831E/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 8 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit device offers far finer quantization than an 8-bit device, so they are not functionally interchangeable in precision applications. |
| Number of Input Channels | 4 single-ended / 2 differential | 1 single-ended | Channel count defines how many analog signals can be multiplexed into one converter; the multi-channel ADS8344E can replace a single-channel ADS831E only if the system needs just one input path. |
| Sampling Rate | 100 kSPS | 20 MSPS | Maximum sample rate sets the bandwidth of signals the ADC can digitize; the much faster ADS831E suits high-speed acquisition while the ADS8344E targets slower precision measurement. |
| Interface Type | SPI (serial) | Parallel | The digital interface must match the host controller; a serial SPI device and a parallel-output device require different board routing and firmware, preventing direct drop-in substitution. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V | Supply voltage compatibility determines whether the part can operate in the target rail; the wide-range ADS8344E supports low-voltage systems that the 5 V-only ADS831E cannot. |
| Input Type | SAR, differential/single-ended | Pipeline, single-ended | The ADC architecture affects latency, accuracy, and input drive requirements; SAR and pipeline converters behave differently in control loops and signal chains, limiting substitutability. |
| Package | SSOP-20 | SSOP-20 | Package footprint and pinout must match for a physical board swap; although both use SSOP-20, the differing pin functions mean the footprint alone does not guarantee compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range confirms both parts suit industrial environments; matching ratings means thermal constraints do not differentiate them for substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344E | ADS831E/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| Sampling Rate(Per Second) | 100k | 80M |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | Pipelined |
| Reference Type | External | External, Internal |
| 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 |
Frequently asked questions
What are the key architectural differences between the ADS8344E and the ADS831E/2K5G4?
The ADS8344E is a 16-bit, 8-channel successive-approximation-register (SAR) analog-to-digital converter with a serial interface, operating from a single +2.7V to +5V supply. The ADS831E/2K5G4 is an 8-bit, 1-channel pipelined analog-to-digital converter with a parallel interface, operating from a single +5V supply. The ADS8344E targets multi-channel, medium-speed data acquisition, while the ADS831E targets high-speed single-channel digitization.
How do the sampling rates of the ADS8344E and ADS831E/2K5G4 compare?
The ADS8344E supports a maximum sampling rate of 100 kSPS. The ADS831E/2K5G4 supports a maximum sampling rate of 80 MSPS. The ADS831E is therefore roughly three orders of magnitude faster, reflecting its pipelined architecture versus the SAR architecture of the ADS8344E.
Do the ADS8344E and ADS831E/2K5G4 have compatible digital interfaces?
No. The ADS8344E uses a serial SPI-compatible interface, while the ADS831E/2K5G4 uses a parallel digital output interface. The two devices cannot share the same digital host interface without different FPGA or microcontroller pin assignments and timing configurations.
What are the input channel configurations of the ADS8344E and ADS831E/2K5G4?
The ADS8344E provides 8 single-ended inputs or 4 differential input pairs, selectable via configuration. The ADS831E/2K5G4 provides a single analog input channel. The ADS8344E is suited to multi-channel multiplexed acquisition, whereas the ADS831E is intended for single-channel high-speed signal chains.
How do the supply voltage and power requirements differ between the ADS8344E and ADS831E/2K5G4?
The ADS8344E operates from a single supply of +2.7V to +5V. The ADS831E/2K5G4 operates from a single +5V supply. Both are single-supply devices, but the ADS8344E offers a wider low-voltage operating range suitable for 3.3V systems, while the ADS831E is fixed at 5V.
Are the ADS8344E and ADS831E/2K5G4 pin-to-pin or package compatible?
No. The ADS8344E is offered in a 20-pin SSOP package, while the ADS831E/2K5G4 is offered in a 20-pin SSOP package as well, but the pin functions and signal assignments differ because of the different interfaces and architectures. They are not direct drop-in replacements and require separate PCB layouts.
Can the ADS8344E and ADS831E/2K5G4 be used in the same application?
Generally no, because they serve different roles. The ADS8344E is intended for multi-channel, moderate-resolution, medium-speed data acquisition, while the ADS831E/2K5G4 is intended for high-speed, 8-bit, single-channel digitization such as video or communications signal paths. Selecting between them depends on resolution, channel count, and sampling rate requirements rather than substitution.