Part A
ADC128S022CIMTX
德州儀器
- Lifecycle
- Active
- Stock
- 1255 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADC128S022CIMTX and ADC12138CIWM are not drop-in replacements for one another. They differ in resolution, channel count, digital interface, and package footprint, so substituting one for the other requires a full board and firmware redesign rather than a direct swap.
Different resolution
Different channel count
Different digital interface
Different package footprint
Parts at a glance
Part B
ADC12138CIWM
德州儀器
- Lifecycle
- Active
- Stock
- 6099 件
- Package
- SOIC-28
- Series
- 資料獲取-模數轉換器（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 | ADC128S022CIMTX | ADC12138CIWM | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit converters, so nominal quantization resolution is equivalent for substitutability. |
| Number of Input Channels | 8 single-ended | 4 differential / 8 single-ended | Channel count and configuration determine how many signals can be measured and whether differential measurement is possible. |
| Sampling Rate | 50 kSPS to 200 kSPS | 114 kSPS | Maximum throughput affects whether the part can keep up with the required signal bandwidth in the target system. |
| Interface Type | SPI (serial) | SPI / Microwire (serial) | Digital interface compatibility determines whether the part can be dropped into the existing host processor bus without glue logic. |
| Supply Voltage | 2.7 V to 5.25 V | 3.0 V to 5.5 V | Supply range must overlap the system rail; differences at the low end can exclude one part in low-voltage designs. |
| Package | TSSOP-16 | SOIC-16 (wide) | Footprint and package style affect PCB layout and whether a board redesign is needed for substitution. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | Temperature range must cover the application environment; the narrower range of one part may limit use in harsh conditions. |
| Reference Configuration | External reference | External reference | Both require an external reference, so reference circuitry can be reused, but accuracy depends on the chosen reference. |
| Power Consumption | Low power (CMOS, ~1.2 mW at 3 V typical) | Higher power (CMOS, ~15 mW typical) | Power draw affects thermal budget and battery life; a significant difference can matter in portable or dense designs. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC128S022CIMTX | ADC12138CIWM |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 114k |
| Number of Inputs | 8 | 4, 8 |
| Input Type | Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | SPI, DSP | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | Supply | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 3V ~ 5.5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADC128S022CIMTX and the ADC12138CIWM?
The ADC128S022CIMTX is an 8-channel, 12-bit successive-approximation ADC with a serial (SPI/QSPI/MICROWIRE) interface, offered in a 16-pin TSSOP package. The ADC12138CIWM is a 12-bit successive-approximation ADC with a serial interface, offered in a 28-pin SOIC package. They differ in channel count, package, and interface configuration, so they are not pin-compatible substitutes.
What is the resolution and architecture of each device?
Both devices are 12-bit successive-approximation register (SAR) analog-to-digital converters. The ADC128S022CIMTX provides 12-bit resolution across 8 input channels, while the ADC12138CIWM provides 12-bit resolution with a multiplexed input structure in a larger package.
What supply voltage do these ADCs require?
The ADC128S022CIMTX operates from a single 2.7 V to 5.25 V supply. The ADC12138CIWM operates from a 5 V supply. Designers should confirm the exact supply range against the respective manufacturer datasheet before finalizing a design.
What interface do these ADCs use to communicate with a host controller?
Both devices use a serial interface compatible with SPI, QSPI, and MICROWIRE protocols, allowing connection to most microcontrollers and DSPs. The ADC128S022CIMTX uses a standard serial frame for channel selection and data readout, while the ADC12138CIWM uses a serial interface with its own command structure as defined in its datasheet.
Are the ADC128S022CIMTX and ADC12138CIWM pin-compatible?
No. The ADC128S022CIMTX is packaged in a 16-pin TSSOP, while the ADC12138CIWM is packaged in a 28-pin SOIC. The pin counts, pin functions, and PCB land patterns differ, so they cannot be dropped into the same footprint without a board redesign.
What are the operating temperature ranges for these components?
Both the ADC128S022CIMTX and the ADC12138CIWM are specified for the industrial temperature range of -40°C to +85°C, making them suitable for industrial and embedded applications. Verify the exact grade against the manufacturer datasheet for the specific orderable part number.
Can the ADC128S022CIMTX directly replace the ADC12138CIWM in an existing design?
No. Because the two devices differ in package (16-pin TSSOP vs 28-pin SOIC), channel configuration, and supply requirements, a direct replacement is not possible. Any substitution requires a PCB redesign and validation against the target system's timing, reference, and interface requirements.