Part A
ADC128S022CIMTX
Texas Instruments
- Lifecycle
- Active
- Stock
- 1255 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADC128S022CIMTX and ADC12038CIWM 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
ADC12038CIWM
Texas Instruments
- Lifecycle
- Active
- Stock
- 8709 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit 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 | ADC128S022CIMTX | ADC12038CIWM | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit converters, so nominal quantization accuracy is equivalent for substitutability. |
| Number of Input Channels | 8 single-ended | 8 single-ended / 4 differential | The ADC12038 supports differential inputs, enabling better noise rejection and bipolar signal measurement that the ADC128S022 cannot provide. |
| Sampling Rate | 200 kSPS | 114 kSPS | A higher sampling rate allows capture of faster-changing signals; the ADC128S022 offers roughly double the throughput. |
| Interface Type | SPI (serial) | Parallel (byte-wide) | The digital interface differs fundamentally; SPI uses fewer pins while parallel offers higher raw data throughput and simpler glue logic. |
| Supply Voltage | 2.7 V to 5.25 V | 4.5 V to 5.5 V | The ADC128S022 operates over a wider low-voltage range, making it suitable for 3.3 V systems where the ADC12038 would not function. |
| Package | TSSOP-16 | SOIC-28 (wide) | Different footprints and pin counts mean the parts are not drop-in replacements on an existing PCB layout. |
| Reference Type | Internal reference (with external option) | External reference | An internal reference simplifies design and reduces external components, while an external reference allows higher-accuracy or custom reference voltages. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature range of the ADC128S022 suits harsher environments and provides more thermal margin. |
| Power Consumption | Low power (approx. 1.2 mW at 3 V) | Higher power (approx. 15 mW at 5 V) | Lower power dissipation is critical for battery-powered and thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC128S022CIMTX | ADC12038CIWM |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADC128S022CIMTX and the ADC12038CIWM?
The ADC128S022CIMTX is an 8-channel, 12-bit successive-approximation ADC with a serial (SPI-compatible) interface, offered in a 16-pin TSSOP package. The ADC12038CIWM is a 12-bit successive-approximation ADC with a parallel interface, offered in a 28-pin SOIC package. They differ in channel count, interface type, and package footprint.
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 ADC12038CIWM provides 12-bit resolution with a multiplexed input structure and a parallel output bus.
What supply voltage do these ADCs require?
The ADC128S022CIMTX operates from a single 2.7 V to 5.25 V analog supply. The ADC12038CIWM operates from a single 5 V supply. Designers should confirm exact supply ranges against the respective manufacturer datasheets before finalizing a design.
How do the digital interfaces of these two ADCs differ?
The ADC128S022CIMTX uses a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols, reducing pin count and board routing. The ADC12038CIWM uses a parallel digital output interface, which requires more I/O pins but can offer higher throughput in parallel-bus systems.
Are the ADC128S022CIMTX and ADC12038CIWM pin-compatible or package-compatible?
No. The ADC128S022CIMTX is supplied in a 16-pin TSSOP package, while the ADC12038CIWM is supplied in a 28-pin SOIC package. The pin counts, pin functions, and PCB land patterns differ, so they are not direct drop-in replacements.
Can the ADC128S022CIMTX and ADC12038CIWM be used as substitutes for each other?
They are not direct substitutes. Substitution would require redesign of the digital interface (serial versus parallel), changes to the PCB footprint and land pattern, and revalidation of supply, timing, and channel-count requirements against the target design.
What input channel configuration does each ADC provide?
The ADC128S022CIMTX provides 8 single-ended input channels multiplexed into a single SAR converter. The ADC12038CIWM provides a multiplexed input structure with multiple selectable channels; designers should consult the manufacturer datasheet for the exact channel configuration and single-ended versus differential options.
Which device is better suited for space-constrained or low-pin-count designs?
The ADC128S022CIMTX is generally better suited to space-constrained designs because its serial interface and 16-pin TSSOP package require fewer I/O pins and less board area than the parallel-interface, 28-pin SOIC ADC12038CIWM.