Part A
ADS8344EB
Texas Instruments
- Lifecycle
- Active
- Stock
- 6770 PCS
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8344EB and ADS831E/2K5G4 are not drop-in replacements for one another. The ADS8344EB 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 analog input architecture differ fundamentally, so a direct board-level substitution is not feasible without redesign.
Different channel count
Different digital interface
Different package footprint
Different input 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 | ADS8344EB | 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 ADS8344EB 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 capture; the much faster ADS831E suits high-speed acquisition while the ADS8344EB targets slower precision measurement. |
| Interface Type | SPI / serial (QSPI, Microwire, DSP compatible) | 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 drop-in substitution. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V | Supply range determines compatibility with the system power rail; the wide-range ADS8344EB can operate on lower-voltage rails while the ADS831E requires a 5 V supply. |
| Architecture | SAR (successive approximation) | Pipeline | Converter architecture affects latency, accuracy, and power; SAR offers low latency and high precision, while pipeline enables high throughput, so the two are suited to different signal-chain designs. |
| Input Type | Single-ended / pseudo-differential | Single-ended | Input configuration determines how signals are referenced and wired; differential capability in the ADS8344EB improves noise rejection and cannot be replicated by the single-ended ADS831E. |
| Package / Mounting | SSOP-20 surface mount | SOIC-20 surface mount | Footprint and package style must match the PCB layout; differing package outlines mean the parts are not physically interchangeable without a board redesign. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344EB | ADS831E/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| Sampling Rate(Per Second) | - | 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 |
| 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 |
| Base Product Number | ADS8344 | - |
| Sampling Rate (Per Second) | 100k | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Bulk, Tube | - |
Frequently asked questions
What are the key differences between the ADS8344EB and the ADS831E/2K5G4?
The ADS8344EB is a 16-bit, 8-channel successive-approximation ADC with a serial (SPI/QSPI/Microwire) interface, operating from a 2.7 V to 5 V supply, offered in a 20-pin SSOP package. The ADS831E/2K5G4 is an 8-bit, 1-channel pipelined ADC with a parallel interface, operating from a 5 V supply, offered in a 20-pin SSOP package and supplied in tape-and-reel (2K5) form. They differ in resolution, channel count, interface type, and supply requirements.
Are the ADS8344EB and ADS831E/2K5G4 pin-compatible or directly interchangeable?
No. Although both devices are offered in a 20-pin SSOP package, they have different pin functions and interfaces (serial for the ADS8344EB versus parallel for the ADS831E/2K5G4), different resolutions (16-bit versus 8-bit), and different channel counts (8 versus 1). They are not direct substitutes and require separate design validation.
What are the resolution and channel-count specifications of each device?
The ADS8344EB provides 16-bit resolution with 8 single-ended or 4 differential input channels. The ADS831E/2K5G4 provides 8-bit resolution with a single input channel. These differences make the ADS8344EB suited to multi-channel, higher-precision acquisition, while the ADS831E/2K5G4 targets single-channel, high-speed conversion.
What digital interfaces do the ADS8344EB and ADS831E/2K5G4 use?
The ADS8344EB uses a serial interface compatible with SPI, QSPI, and Microwire, reducing pin count and supporting daisy-chaining. The ADS831E/2K5G4 uses a parallel digital output interface, which requires more I/O pins but can support higher throughput to a host processor or FPGA.
What are the supply voltage and reference requirements for each part?
The ADS8344EB operates from a single 2.7 V to 5 V analog supply and supports an external reference voltage. The ADS831E/2K5G4 operates from a 5 V supply and uses an external reference. Designers should confirm exact reference ranges and analog input spans against the respective manufacturer datasheets before finalizing the design.
What package and ordering format differences exist between the two parts?
Both devices are offered in a 20-pin SSOP package. The ADS8344EB is supplied in tube/rail form, while the ADS831E/2K5G4 suffix indicates tape-and-reel packaging (2K5) intended for automated assembly. The package footprint is similar, but pin assignments and functions differ, so PCB layouts are not interchangeable.
Which device is better suited for multi-channel data acquisition versus high-speed single-channel conversion?
The ADS8344EB, with 8 input channels and 16-bit resolution, is better suited to multi-channel data acquisition such as industrial monitoring and instrumentation. The ADS831E/2K5G4, with a single channel, 8-bit resolution, and parallel interface, is better suited to high-speed single-channel conversion where throughput and simple parallel interfacing are prioritized over resolution.
Can the ADS8344EB and ADS831E/2K5G4 operate in the same system without additional level shifting?
Not necessarily. The ADS8344EB can operate from supplies as low as 2.7 V, while the ADS831E/2K5G4 requires a 5 V supply. If the host logic runs at a lower voltage, level shifting may be required for the ADS831E/2K5G4 parallel interface. Interface voltage compatibility should be verified against each datasheet before combining the devices in one system.