Part A
ADS8344E
德州儀器
- Lifecycle
- Active
- Stock
- 2647 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS8341E and ADS8344E share the same 16-bit SAR architecture, SPI-compatible serial interface, and 16-pin SSOP package, making the ADS8344E a viable functional replacement candidate for the ADS8341E in many designs. However, the ADS8344E offers a higher sampling rate and additional input channels, so engineers should validate timing margins, input configuration, and reference requirements against the target application before substituting.
Resolution and Architecture
High match
Package Type
High match
Sampling Rate
Validation required
Input Channel Count
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS8341E | ADS8344E | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Number of Input Channels | 4 single-ended / 2 differential | 8 single-ended / 4 differential | Channel count determines how many signals can be multiplexed into one ADC; the ADS8344E supports twice as many inputs. |
| Sampling Rate | 100 kSPS | 100 kSPS | Throughput is the same, so timing and bandwidth requirements are unaffected by the choice. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means both can operate from the same rails in a given design. |
| Interface | SPI-compatible serial | SPI-compatible serial | Same serial interface allows drop-in compatibility with the host microcontroller or DSP. |
| Package | 16-pin SSOP | 20-pin SSOP | Different pin counts and footprints mean the PCB layout must be redesigned; they are not footprint-compatible. |
| Input Type | Single-ended / differential | Single-ended / differential | Both support the same input configurations, so signal conditioning requirements are equivalent. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range, so environmental suitability is unchanged. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8344E | ADS8341E |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| Number of Inputs | 4, 8 | 2, 4 |
| Input Type | Differential, Single Ended | 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 | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS8341E and ADS8344E?
The ADS8341E is a 16-bit, 4-channel successive-approximation ADC, while the ADS8344E is a 16-bit, 8-channel successive-approximation ADC. Both are pin-compatible in the same 20-pin SSOP package but differ in input channel count and some timing/throughput characteristics per the respective Texas Instruments datasheets.
Are the ADS8341E and ADS8344E pin-compatible?
Yes. Both devices are offered in a 20-pin SSOP (DB) package with the same pinout, which allows the ADS8344E to be used in place of the ADS8341E on an existing PCB layout when the additional input channels are required, subject to firmware and timing verification.
How many input channels does each device provide?
The ADS8341E provides 4 single-ended inputs or 2 differential inputs, while the ADS8344E provides 8 single-ended inputs or 4 differential inputs. Channel selection is configured through the serial control word in both devices.
Do both devices use the same serial interface?
Yes. Both the ADS8341E and ADS8344E use a SPI-compatible serial interface with a chip-select, serial clock, data-in, and data-out signal, supporting daisy-chain capability. The control word format is the same, but the channel-address field must be limited to valid channels for each device.
What is the resolution and sampling architecture of these ADCs?
Both the ADS8341E and ADS8344E are 16-bit successive-approximation register (SAR) analog-to-digital converters. They provide no missing codes at 16 bits and are specified for a maximum throughput of 100 kSPS per the Texas Instruments datasheets.
What is the analog input voltage range for the ADS8341E and ADS8344E?
Both devices accept a unipolar input range of 0 V to VREF and a bipolar input range of -VREF to +VREF, where VREF is the external reference voltage applied to the VREF pin. The reference input range is specified from 500 mV to VDD in the datasheets.
What supply voltage do the ADS8341E and ADS8344E require?
Both devices operate from a single supply of 2.7 V to 5.25 V (VDD) with a separate digital supply (VIO) of 2.7 V to 5.25 V, allowing direct interfacing to 3 V or 5 V logic. Power consumption is specified in the low-milliwatt range at 100 kSPS.
Can the ADS8344E directly replace the ADS8341E in an existing design?
Because the two devices share the same 20-pin SSOP package and pinout, the ADS8344E can be populated on an ADS8341E footprint. However, the firmware must be reviewed to ensure channel-address commands remain within the valid range and that timing and throughput requirements are met per the ADS8344E datasheet.