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Texas Instruments TLV0838CDWRG4
- Part No.:
- TLV0838CDWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLV0838CDWRG4.pdf
- Description:
- IC ADC 8BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
TLV0838CDWRG4 from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel multiplexer, serial interface, and ratiometric operation capability. It operates from 2.7 V to 3.6 V, delivers ±1 LSB total unadjusted error, achieves 32 µs conversion time at 250 kHz clock, and supports single-ended, differential, and pseudodifferential input configurations for sensor signal digitization in embedded monitoring systems.
For engineers reviewing the TLV0838CDWRG4 datasheet, TLV0838CDWRG4 pinout, TLV0838CDWRG4 application, or TLV0838CDWRG4 equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world use scenarios, and two functionally comparable alternatives with documented differences in channel count and temperature grade.
Technical Context
The TLV0838CDWRG4 implements a sample-data-comparator SAR architecture with a 9-bit internal shift register supporting MSB-first or LSB-first serial output controlled by the SE pin. Its multiplexer uses software-configured 3-bit address logic to select among eight analog inputs with polarity assignment per channel pair for true differential operation.
It features dual ground separation (ANLG GND and DGTL GND), accepts reference voltage (REF) independent of VCC, supports ratiometric conversion when REF = VCC, and maintains compatibility with TTL/MOS logic levels on all digital I/O pins including CS, DI, CLK, DO, and SARS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - Provides 256 discrete output codes for moderate-precision sensor digitization. |
| Supply Voltage Range | 2.7 V to 3.6 V - Enables direct integration into 3-V microcontroller systems without level-shifting. |
| Conversion Time | 32 µs at fCLK = 250 kHz - Supports up to ~31.25 kSPS sampling rate for dynamic signal capture. |
| Total Unadjusted Error | ±1 LSB - Guarantees monotonicity and eliminates missing codes across full-scale range. |
| Input Channels | 8-channel MUX with COM terminal - Allows flexible single-ended, differential (CH0–CH1, CH2–CH3, etc.), or pseudodifferential (all vs. COM) acquisition. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial and automotive under-hood environments. |
| Package | TSSOP-20 (PW) - Surface-mount, 0.65 mm pitch, RoHS-compliant, MSL Level-1. |
Pinout & Package
TSSOP-20 package (PW), 0.65 mm lead pitch, 7.0 mm × 4.4 mm body, exposed pad not present, moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog Input Channels | Eight configurable analog inputs; each may serve as positive or negative terminal depending on MUX address and SGL/DIF mode. |
| COM | Common Analog Reference | Used as shared negative input for pseudodifferential mode; enables biasing above ground (e.g., 1.65 V mid-rail). |
| DGTL GND | Digital Ground | Return path for digital I/O circuits; must be separated from ANLG GND to minimize noise coupling. |
| ANLG GND | Analog Ground | Return path for analog inputs and reference; star-point connection recommended for precision performance. |
| VCC | Power Supply | 2.7–3.6 V supply powering both analog and digital sections; also serves as default reference when REF is unconnected. |
| REF | Reference Voltage Input | Accepts external reference (0 V to VCC); enables full-scale encoding of sub-VCC spans (e.g., 0–2.5 V with 2.5 V REF). |
| CS | Chip Select | Active-low enable; must remain low throughout conversion; high state clears registers and places DO/SARS in high-Z. |
| DI | Serial Data Input | Receives 4-bit MUX address + start bit; sampled on CLK rising edge during addressing phase only. |
| CLK | Serial Clock Input | Drives internal timing; supports 10–600 kHz (VCC-dependent); duty cycle 40–60% required. |
| SARS | Start-of-Conversion Status | Open-drain active-high output indicating conversion in progress; used for handshaking or interrupt generation. |
| DO | Serial Data Output | MSB-first by default; LSB-first when SE is asserted low before data read; tri-state when CS high. |
| SE | Output Format Control | Controls DO data order: high = MSB-first; low = LSB-first (after initial MSB-first sequence completes). |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable MUX | Single 3-bit serial address selects channel, polarity, and SGL/DIF mode - eliminates external decoding logic. |
| Ratiometric Operation | Uses VCC as reference source - removes need for precision external reference in cost-sensitive applications. |
| Pseudodifferential Input Mode | COM terminal allows all channels to share a common offset voltage - ideal for biased sensor arrays or floating sources. |
| Low-Power Serial Interface | Only three digital lines (CS, CLK, DI/DO) required - reduces PCB routing complexity and I/O pin count on host MCU. |
| Industrial Temperature Range | –40°C to +85°C operation - supports deployment in motor control, HVAC, and factory automation without derating. |
Applications
| Motor Current Sensing | Environmental Sensor Hub |
|---|---|
|
Use Scenario: Digitizing shunt voltage drops across multiple motor phases in BLDC inverters with isolated power domains. IC Role / Device Role / Timing Role: 8-channel ADC acquires simultaneous current samples via pseudodifferential mode using COM as common-mode bias point. Use Value: Eliminates need for external op-amp level-shifting stages and reduces BOM count by integrating MUX + SAR + serial interface in one TSSOP-20 device. |
Use Scenario: Aggregating outputs from temperature, humidity, and CO₂ sensors in smart building controllers. IC Role / Device Role / Timing Role: Serial-controlled MUX sequentially scans analog sensor outputs while maintaining separate analog/digital grounds for noise immunity. Use Value: Achieves ±1 LSB accuracy across –40°C to +85°C ambient, enabling reliable calibration-free operation over full industrial temperature range. |
| Programmable Logic Controller (PLC) Input Module | Portable Medical Instrumentation |
|
Use Scenario: Converting 0–10 V or 4–20 mA field signals from industrial transmitters in modular I/O cards. IC Role / Device Role / Timing Role: Ratiometric operation with external REF allows precise scaling of non-standard input ranges (e.g., 0–2.5 V) to full 8-bit resolution. Use Value: Enables flexible analog input configuration without hardware changes - reprogrammed via serial command instead of resistor network redesign. |
Use Scenario: Battery-powered ECG front-end acquiring lead-II and limb electrode voltages with low-noise analog conditioning. IC Role / Device Role / Timing Role: Low 0.75 mA typical supply current at 3.3 V extends battery life; TSSOP-20 footprint minimizes board area in handheld enclosures. Use Value: Integrates 8-channel scanning and serial output in <7 mm² area - reduces component count versus discrete MUX + ADC solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV0838CPWR | Same architecture and pinout, but rated for 0°C to 70°C only; marked "TLV0838C" on package. | Not suitable for extended temperature deployments (e.g., outdoor industrial nodes or automotive cabins). | Select TLV0838CPWR only for commercial-grade applications where ambient stays within 0–70°C. |
| ADC0838CCN | Legacy 8-bit ADC with identical 20-pin PDIP package and functional equivalence at 3 V, but lacks SE pin and fixed MSB-first output. | Requires redesign of host firmware to remove LSB-first support; no pseudodifferential COM mode. | Choose ADC0838CCN only if legacy drop-in replacement is mandatory and SE-driven output flexibility is unnecessary. |
Compared with TLV0838CPWR and ADC0838CCN, the TLV0838CDWRG4 uniquely combines industrial temperature rating (–40°C to +85°C), programmable LSB-first output via SE, and pseudodifferential COM mode - making it the only option supporting wide-temperature, flexible-data-format, and biased-sensor applications in a single TSSOP-20 package.
Availability
TLV0838CDWRG4 is available at Aetrix Electronics and suitable for industrial automation, motor control, environmental monitoring, and portable instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TLV0838CDWRG4 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 IC design.
The TLV0838CDWRG4 belongs to TI's low-voltage, serial-interface ADC family designed specifically for space-constrained, battery-aware, and noise-sensitive embedded systems requiring flexible analog input handling without external support components.
FAQ
What is the maximum clock frequency supported by TLV0838CDWRG4?
The TLV0838CDWRG4 supports up to 600 kHz clock frequency when operated at VCC = 3.3 V, and 250 kHz at VCC = 2.7 V. The clock duty cycle must be maintained between 40% and 60% for reliable operation across the full temperature range of –40°C to +85°C. Exceeding these limits risks timing violations and conversion errors.
Does TLV0838CDWRG4 require an external reference voltage?
No, TLV0838CDWRG4 does not require an external reference voltage. It operates ratiometrically using VCC as the reference source when the REF pin is left unconnected. An external reference (0 V to VCC) may be applied to REF for improved accuracy or to encode sub-VCC input ranges - but it is optional, not mandatory.
How is differential input configured on TLV0838CDWRG4?
Differential input on TLV0838CDWRG4 is configured via the 3-bit serial MUX address: adjacent channel pairs (e.g., CH0/CH1, CH2/CH3) are assigned opposite polarities. The TLV0838CDWRG4 datasheet Table "TLV0838 MUX-Address Control Logic" defines exact bit patterns for selecting differential mode and polarity - no external switches or resistors are needed.
What is the function of the SE pin on TLV0838CDWRG4?
The SE (Serial Output Enable) pin on TLV0838CDWRG4 controls data output format: when held high, DO outputs MSB-first; when pulled low before reading, DO outputs LSB-first after the initial MSB-first sequence. This dual-mode capability simplifies interface with MCUs that lack configurable SPI MSB/LSB ordering.
Can TLV0838CDWRG4 operate with a 2.5-V supply?
No, TLV0838CDWRG4 is not specified for 2.5-V operation. Its absolute minimum supply voltage is 2.7 V, and recommended operating range is 2.7 V to 3.6 V. At 2.5 V, timing margins degrade, conversion accuracy falls outside specification (±1 LSB), and functionality is not guaranteed per the datasheet's recommended operating conditions.
TLV0838CDWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 37.9k
- Number of Inputs:
- 4, 7, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLV0838CDWRG4 FAQ
1.How can I place an order for TLV0838CDWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV0838CDWRG4 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 TLV0838CDWRG4 reliable?
The price and inventory of TLV0838CDWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV0838CDWRG4 is usually 5 days.
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TLV0838CDWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV0838CDWRG4 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 TLV0838CDWRG4?
For technical support, including TLV0838CDWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV0838CDWRG4 requirements.
6.How does Aetrix verify that TLV0838CDWRG4 is sourced from the original manufacturer or authorized distributors?
All TLV0838CDWRG4 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 TLV0838CDWRG4 meets industry standards.
7.What is the process for return or replacement of TLV0838CDWRG4?
All TLV0838CDWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLV0838CDWRG4, 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 TLV0838CDWRG4 part is unused and in its original packaging.
Return procedure for TLV0838CDWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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