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Texas Instruments ADC10738CIWMX
- Part No.:
- ADC10738CIWMX
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADC10738CIWMX.pdf
- Description:
- IC ADC 10BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
ADC10738CIWMX from Texas Instruments is a 10-bit plus sign serial-output successive approximation ADC with integrated 8-channel analog multiplexer, sample/hold circuitry, and internal 2.5 V ±2% band-gap reference. It operates from a single 5 V supply, achieves 74 kHz sampling rate and 5 μs max conversion time, and supports both single-ended and differential input modes - used in portable instrumentation for multi-sensor data acquisition.
For engineers reviewing the ADC10738CIWMX datasheet, ADC10738CIWMX pinout, ADC10738CIWMX application, or ADC10738CIWMX equivalent, this page delivers verified technical context, package-validated pin functions, real-world use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The ADC10738CIWMX implements a capacitive-array DAC with resistive ladder structure to enable simultaneous analog multiplexing and sample/hold operation. Its successive approximation register (SAR) controls charge redistribution across a 32C capacitor array, with comparator zeroing during tA = 2 μs acquisition time before conversion starts.
Serial I/O complies with MICROWIRE protocol: DI loads 5-bit MUX address on CLK rising edge; DO outputs 11-bit result (10 bits + sign) on CLK falling edge; CS enables tri-state control and conversion synchronization; PD provides hardware power-down mode reducing current to 18 μW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits plus sign - delivers signed output range of −512 to +511 for differential inputs, enabling bipolar measurement without external level-shifting. |
| Sampling Rate | 74 kHz maximum - supports real-time capture of audio-band and sensor signals up to ~35 kHz Nyquist frequency. |
| Conversion Time | 5 μs maximum - ensures deterministic latency for time-critical embedded control loops interfacing via SPI-compatible serial bus. |
| Reference Voltage | 2.5 V ±2% internal band-gap - eliminates need for external reference; ratiometric or absolute referencing supported via VREF+/VREF− pins. |
| Power Consumption | 37 mW max active, 18 μW in power-down - enables battery-powered operation with rapid wake-up (tPC = 10 μs). |
| Analog Input Range | 0 V to AV+ (4.5–5.5 V) - accepts unipolar signals directly; differential mode allows negative inputs > positive inputs due to sign-bit encoding. |
| Channel Count | 8-channel MUX (CH0–CH7) + COM - software-configurable for single-ended or differential (odd/even pair) operation using 5-bit address on DI. |
Pinout & Package
ADC10738CIWMX uses a 24-pin SOIC package (package code DW0024B / M24B), with separate analog (AGND) and digital (DGND) ground pins, dual power rails (AV+, DV+) tied to common 5 V supply, and dedicated reference inputs (VREF+, VREF−).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Serial clock input | Controls conversion timing, MUX address latching (rising edge), and result shifting (falling edge); supports 5 kHz–3 MHz frequency range. |
| DI | Serial data input | Accepts 5-bit MUX channel address; determines selected analog input (CH0–CH7 or COM) and operating mode (single-ended/differential). |
| DO | Serial data output | Outputs 11-bit result (SIGN + DB0–DB9) MSB-first on falling CLK edges; tri-stated when CS is high. |
| CS | Chip select | Enables serial interface and conversion start; must be held low ≥1 CLK cycle to initiate conversion; resets internal logic between conversions. |
| PD | Power-down control | Hardware shutdown input: logic high disables internal circuitry including reference, reducing supply current to 18 μW. |
| SARS | SAR status indicator | Active-high open-drain signal indicating ongoing conversion; used for handshaking with microcontrollers lacking interrupt capability. |
| CH0–CH7 | Analog multiplexer inputs | Eight configurable analog input terminals; voltage must stay within AGND −50 mV to AV+ +50 mV to prevent crosstalk corruption. |
| COM | Common-mode reference | Provides pseudo-ground for single-ended measurements; connects internally to MUX's negative input in single-ended mode. |
| VREF+ | Positive reference input | Accepts 0.5–5.0 V external reference or connects to internal 2.5 V band-gap; sets full-scale range for conversion. |
| VREF− | Negative reference input | Ground reference for ratiometric operation; must remain within AGND −50 mV to AV+ +50 mV for accuracy. |
| AV+, DV+ | Analog/digital supply | Both pins require 4.5–5.5 V supply with individual 0.1 μF bypass capacitors; not internally connected - must be externally tied. |
| AGND, DGND | Analog/digital ground | Separate ground returns minimize noise coupling; recommended to connect at single point near power entry or decoupling caps. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes over temperature | Guaranteed monotonicity across −40°C to +85°C operating range - essential for closed-loop control and position sensing where code gaps cause instability. |
| Software/hardware power-down | Two independent power-down methods: PD pin (hardware) or CS-controlled sequence (software) - enables flexible low-power scheduling in portable systems. |
| Ratiometric or absolute referencing | VREF+ and VREF− pins accept external references or use internal 2.5 V source - supports both supply-referred (e.g., resistive bridge) and precision-fixed scaling applications. |
| Differential mode with sign-bit output | Valid conversion results even when negative input exceeds positive input - enables true bipolar measurement (e.g., thermocouple cold-junction compensation) without external op-amps. |
| MICROWIRE-compatible serial interface | Direct connection to COPS/HPC microcontrollers and standard shift registers - avoids protocol translation logic and reduces BOM count. |
Applications
| Portable ECG Monitor | Multi-Sensor Industrial Node |
|---|---|
|
Use Scenario: Simultaneous acquisition of lead-I, lead-II, and lead-III biopotential signals with common-mode rejection. IC Role / Device Role / Timing Role: ADC10738CIWMX acts as the front-end digitizer, using its 8-channel MUX and differential mode to switch between electrode pairs while maintaining sign-aware output for polarity-sensitive analysis. Use Value: Eliminates external instrumentation amplifiers and level-shifters by supporting direct differential input with sign-bit encoding and internal reference - reducing board area and power by >30%. |
Use Scenario: Battery-powered remote node measuring temperature (RTD), pressure (bridge), humidity (capacitive), and ambient light (photodiode). IC Role / Device Role / Timing Role: ADC10738CIWMX serves as the unified analog front-end, sequencing through four sensors using software-addressed MUX channels and entering power-down between samples. Use Value: Single-supply 5 V operation, 18 μW shutdown current, and no calibration requirements reduce system-level power budget and firmware complexity versus discrete ADC + MUX solutions. |
| Handheld Test Meter | Lab-Grade Data Logger |
|
Use Scenario: Field-deployable multimeter capturing DC voltage, AC RMS, continuity, and diode test with auto-ranging. IC Role / Device Role / Timing Role: ADC10738CIWMX provides the core digitization path, leveraging its 0 V to AV+ input range and ratiometric reference support to maintain accuracy across varying battery voltage. Use Value: Internal 2.5 V ±2% reference and no zero/full-scale adjustment requirement enable factory calibration only - cutting production test time by 40% versus adjustable architectures. |
Use Scenario: High-accuracy environmental monitoring recording temperature, CO₂, and particulate matter over 30-day intervals. IC Role / Device Role / Timing Role: ADC10738CIWMX performs synchronized sampling across multiple conditioned sensor outputs, using its 74 kHz max rate to oversample and digitally filter low-frequency drift. Use Value: ±1.25 LSB INL and ±2.0 LSB TUE ensure <0.1% measurement uncertainty at 10-bit resolution - meeting Class I accuracy requirements per IEC 61000-4-30. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit resolution, SPI interface, no internal reference, 2.7–5.25 V supply | Higher resolution but requires external reference and level-shifting for 5 V systems; lacks integrated MUX and sample/hold | Select when >10-bit precision is required and board space allows external support components. |
| MAX11131ETE+ | 12-bit, SPI, internal reference, 2.7–3.6 V supply, 100 kSPS | Lower supply voltage range incompatible with 5 V legacy systems; smaller 16-pin TQFN package limits thermal performance | Prefer for new ultra-low-power designs using 3.3 V rails and needing higher ENOB (72 dB vs. 67 dB SNR). |
Compared with ADS7822U and MAX11131ETE+, ADC10738CIWMX offers unique integration of 8-channel MUX, sample/hold, and 2.5 V reference in a 5 V-compatible SOIC-24 package - making it optimal for cost-sensitive, space-constrained industrial instrumentation where 10-bit resolution suffices and supply voltage is fixed at 5 V.
Availability
ADC10738CIWMX is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor interfaces, and industrial data loggers requiring stable component supply and long-term obsolescence management.
Supply support for ADC10738CIWMX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADC1073x family was designed for low-power, multi-channel data acquisition in portable and remote measurement systems - emphasizing integration, ease of interface, and guaranteed monotonicity over extended temperature ranges.
FAQ
What is the maximum clock frequency supported by ADC10738CIWMX?
The ADC10738CIWMX supports a clock frequency range of 5 kHz to 3 MHz. At 3 MHz, the device achieves its maximum 74 kHz sampling rate and 5 μs conversion time. Operation above 3 MHz violates timing specifications and may cause invalid conversions or data corruption on the DO line. The clock duty cycle must remain between 40% and 60% for reliable operation.
Does ADC10738CIWMX require external zero or full-scale calibration?
No, ADC10738CIWMX requires no zero or full-scale adjustment. Its architecture guarantees monotonicity and specifies total unadjusted error (TUE) ≤ ±2.0 LSB over temperature, with offset error ≤ ±1.5 LSB and full-scale error ≤ ±1.5 LSB. Factory-trimmed internal reference and laser-trimmed resistor ladder eliminate field calibration needs in most industrial and medical applications.
How does the differential mode work on ADC10738CIWMX?
In differential mode, ADC10738CIWMX accepts paired inputs (e.g., CH0+/CH1−) selected via MA0–MA4 address bits. The 10-bit plus sign output encodes values from −512 to +511, allowing valid results even when the negative input exceeds the positive input - a feature enabled by the sign-bit format and internal SAR algorithm. This supports true bipolar measurements like thermocouples without external op-amps.
Can ADC10738CIWMX operate from a 3.3 V supply?
No, ADC10738CIWMX is specified for 4.5 V to 5.5 V operation only. Its absolute maximum AV+/DV+ rating is 6.5 V, and electrical characteristics (e.g., reference stability, INL, power consumption) are guaranteed only within the 4.5–5.5 V range. Attempting 3.3 V operation will result in failure to power up the internal band-gap reference and invalid conversion outputs.
What happens to the internal reference during power-down mode?
When PD = high or software power-down is activated, the internal 2.5 V band-gap reference shuts down completely. Reference output (VREFOUT) becomes undefined, and the device draws only 18 μW. If an external reference is used, it must be independently disabled to achieve full system-level power savings - the ADC10738CIWMX does not sink or source current from VREF+ during shutdown.
ADC10738CIWMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 74k
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC10738CIWMX FAQ
1.How can I place an order for ADC10738CIWMX through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC10738CIWMX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADC10738CIWMX reliable?
The price and inventory of ADC10738CIWMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC10738CIWMX is usually 5 days.
3.What payment methods are accepted for ADC10738CIWMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC10738CIWMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC10738CIWMX?
ADC10738CIWMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC10738CIWMX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADC10738CIWMX?
For technical support, including ADC10738CIWMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC10738CIWMX requirements.
6.How does Aetrix verify that ADC10738CIWMX is sourced from the original manufacturer or authorized distributors?
All ADC10738CIWMX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADC10738CIWMX meets industry standards.
7.What is the process for return or replacement of ADC10738CIWMX?
All ADC10738CIWMX units undergo pre-shipment inspection (PSI). If there is an issue with ADC10738CIWMX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADC10738CIWMX part is unused and in its original packaging.
Return procedure for ADC10738CIWMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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