Part A
ADS8344NB
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5654 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8344NB and ADS831E/2K5G4 are not drop-in replacements for one another. The ADS8344NB is a 16-bit, 4-channel successive-approximation ADC in a 20-pin SSOP package with a serial interface, while the ADS831E/2K5G4 is an 8-bit, single-channel pipeline ADC in a 20-pin SSOP package with a parallel output interface. Their resolution, channel count, output interface, and conversion architecture differ fundamentally, so substituting one for the other requires a full redesign of the surrounding circuitry and firmware.
Different resolution
Different channel count
Different output interface
Different conversion architecture
Parts at a glance
Part B
ADS831E/2K5G4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5791 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS8344NB | ADS831E/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 8 | Resolution determines the smallest measurable signal step; a 16-bit ADC offers far finer quantization than an 8-bit ADC, so these parts are not functionally interchangeable in precision applications. |
| Number of input channels | 8 (single-ended) / 4 (differential) | 1 (single-ended) | Channel count defines how many signals can be digitized; the multi-channel ADS8344 suits multiplexed sensor arrays, while the single-channel ADS831 suits one-signal designs. |
| Sampling rate (max) | 100 kSPS | 20 MSPS | Maximum sample rate sets the bandwidth of signals that can be captured; the ADS831 is far faster and suited to high-speed acquisition, whereas the ADS8344 targets slower precision measurement. |
| Architecture | SAR | Pipeline | Converter architecture affects latency, accuracy, and speed trade-offs; SAR offers low latency and high accuracy, while pipeline enables high throughput at lower resolution. |
| Interface | SPI / serial | Parallel | The digital interface must match the host controller; SPI is pin-efficient for microcontrollers, while a parallel bus suits high-speed FPGA or DSP interfaces. |
| Supply voltage | 2.7 V to 5.25 V | 5 V (single supply) | Supply range determines compatibility with the system power rail; the wide-range ADS8344 fits low-voltage logic, while the ADS831 requires a 5 V rail. |
| Input type | Single-ended / differential | Single-ended | Differential inputs improve noise immunity and common-mode rejection; the ADS8344 supports both modes, while the ADS831 is limited to single-ended signals. |
| Package | SSOP-20 | SSOP-20 | Package footprint affects PCB layout and assembly; matching packages ease board-level substitution, though electrical differences still prevent direct interchange. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344NB | 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 differences between the ADS8344NB and the ADS831E/2K5G4?
The ADS8344NB is a 16-bit, 8-channel successive-approximation ADC with a serial interface, housed in a 20-pin PDIP package and specified over the -40°C to +85°C temperature range. The ADS831E/2K5G4 is an 8-bit, 1-channel pipelined ADC with a parallel interface, supplied in a 20-pin SSOP package and specified over the -40°C to +85°C temperature range. They differ in resolution, channel count, interface type, and package.
Can the ADS8344NB and ADS831E/2K5G4 be used as direct substitutes for each other?
No. The ADS8344NB is a 16-bit 8-channel serial SAR ADC in a PDIP-20 package, while the ADS831E/2K5G4 is an 8-bit 1-channel parallel pipelined ADC in an SSOP-20 package. Differences in resolution, channel count, digital interface, and package footprint prevent a direct drop-in replacement without redesign.
What are the sampling rates of the ADS8344NB and ADS831E/2K5G4?
The ADS8344NB supports a throughput of up to 100 kSPS. The ADS831E/2K5G4 supports a throughput of up to 80 MSPS. These rates reflect fundamentally different converter architectures (SAR versus pipelined) and target applications.
What digital interfaces do the ADS8344NB and ADS831E/2K5G4 use?
The ADS8344NB uses a serial SPI-compatible interface for data output and configuration. The ADS831E/2K5G4 uses a parallel digital output interface for high-speed data transfer. The interface difference is a key consideration when evaluating board-level compatibility.
What are the package and pin-count differences between the ADS8344NB and ADS831E/2K5G4?
The ADS8344NB is offered in a 20-pin PDIP (NB suffix) package. The ADS831E/2K5G4 is offered in a 20-pin SSOP package. Although both have 20 pins, the package types, body dimensions, and PCB land patterns differ, so they are not footprint-compatible.
What are the analog input configurations of the ADS8344NB and ADS831E/2K5G4?
The ADS8344NB provides 8 single-ended or 4 differential input channels, selectable via configuration. The ADS831E/2K5G4 provides a single analog input channel. The channel-count difference makes them suited to different system architectures.
What are the supply voltage requirements for the ADS8344NB and ADS831E/2K5G4?
The ADS8344NB operates from a single +2.7 V to +5 V analog supply. The ADS831E/2K5G4 operates from a +5 V analog supply with a separate +3 V to +5 V digital supply. Designers should verify exact supply rails against the respective manufacturer datasheets before layout.
Which applications are better suited to the ADS8344NB versus the ADS831E/2K5G4?
The ADS8344NB, with 16-bit resolution and 8 multiplexed channels at up to 100 kSPS, suits multi-channel data acquisition, industrial monitoring, and portable instrumentation. The ADS831E/2K5G4, with 8-bit resolution at up to 80 MSPS, suits high-speed signal capture such as video digitization and communications front ends. Selection should be based on verified datasheet parameters for the target design.