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Texas Instruments TLV0838CPWG4
- Part No.:
- TLV0838CPWG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLV0838CPWG4.pdf
- Description:
- IC ADC 8BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,393
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Product details
Overview
TLV0838CPWG4 from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel multiplexer, serial interface, and ratiometric operation. It operates from 2.7 V to 3.6 V, delivers ±1 LSB total unadjusted error, supports single-ended/differential/pseudodifferential input configurations, and achieves 32 µs conversion time at 250 kHz clock - ideal for low-voltage sensor data acquisition in embedded industrial monitoring systems.
For engineers reviewing the TLV0838CPWG4 datasheet, TLV0838CPWG4 pinout, TLV0838CPWG4 application, or TLV0838CPWG4 equivalent, this page provides verified technical context, validated package mapping, confirmed serial timing behavior, real-world input configuration logic, and cross-referenced alternatives for 3-V ADC selection in space-constrained, noise-sensitive designs.
Technical Context
The TLV0838CPWG4 implements a sample-data-comparator SAR architecture with software-configurable multiplexer addressing via 5-bit serial shift register. Channel selection (CH0–CH7), input polarity (+/−), and mode (single-ended/differential/pseudodifferential) are defined by a start bit followed by a 3- to 4-bit assignment word clocked in on DI.
It features dual output formats: MSB-first (default) and LSB-first (enabled by pulling SE low), with SARS indicating conversion progress and DO entering high-impedance state when CS is high. The common (COM) terminal enables pseudodifferential operation across all channels relative to an arbitrary bias voltage, supporting non-ground-referenced analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes for precise quantization of analog sensor signals. |
| Supply Voltage Range | 2.7 V to 3.6 V - compatible with modern 3.3-V microcontroller I/O and battery-powered systems. |
| Conversion Time | 32 µs at fCLK = 250 kHz - enables up to ~31.25 kSPS sampling for real-time control loops. |
| Total Unadjusted Error | ±1 LSB - ensures monotonicity and predictable full-scale accuracy without calibration. |
| Input Configuration | Software-selectable single-ended, differential (adjacent pairs), or pseudodifferential (vs. COM) - supports flexible sensor interfacing without external op-amps. |
| Reference Mode | Ratiometric or VCC-based - eliminates need for external precision reference in cost-sensitive applications. |
| Digital Interface | 3-wire serial (CS, CLK, DI/DO) - reduces PCB routing complexity and supports bidirectional single-wire operation. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight configurable analog inputs; polarity and mode assigned via serial address word. |
| COM | Common analog reference | Enables pseudodifferential mode: all channels referenced to this voltage instead of ground. |
| DGTL GND | Digital ground | Separate return path for digital logic to minimize noise coupling into analog section. |
| ANLG GND | Analog ground | Isolated return for analog inputs and reference to preserve ADC accuracy. |
| VCC | Power supply | Single 2.7–3.6 V rail powers both analog and digital sections; no separate AVDD required. |
| CS | Chip select | Active-low enable: must remain low throughout conversion; clears registers when high. |
| DI | Serial data input | Accepts start bit + address word during multiplexer setup; ignored during conversion. |
| CLK | Serial clock | Drives internal shift register and SAR logic; duty cycle 40–60% required for reliable operation. |
| SARS | Start-of-conversion status | Active-high open-drain signal indicating conversion in progress; used for handshaking. |
| DO | Serial data output | MSB-first by default; LSB-first if SE pulled low before conversion; high-Z when CS high. |
| SE | LSB-first enable | Controls output format: low enables LSB-first data stream after conversion completes. |
| REF | Reference voltage input | Accepts external reference or connects to VCC for ratiometric operation; 1.3–5.9 kΩ input resistance. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel software-configurable MUX | Eliminates external analog switches; supports mixed single-ended/differential inputs on same device. |
| Pseudodifferential input mode | Uses COM pin as shared negative reference - enables accurate measurement of biased sensor outputs (e.g., thermocouples, current shunts). |
| 3-wire serial interface with bidirectional option | Reduces MCU GPIO count; DI and DO can share one I/O line using tri-state timing discipline. |
| Ratiometric operation | Output code scales linearly with VCC - removes need for stable external reference in cost-sensitive applications. |
| Low supply current | 0.2–0.75 mA typical - extends battery life in portable instrumentation and remote sensors. |
| Industrial temperature range | 0°C to 70°C (C-suffix) - qualified for use in factory automation, HVAC controls, and power supply monitoring. |
Applications
| Temperature Monitoring System | Motor Current Sensing |
|---|---|
|
Use Scenario: Eight thermistors distributed across a motor drive board feed into a single TLV0838CPWG4 for thermal profiling. IC Role / Device Role / Timing Role: ADC performs sequential channel scanning with pseudodifferential mode referenced to local bias voltage, rejecting common-mode noise from switching power stages. Use Value: Reduces component count vs. eight discrete ADCs; maintains ±1 LSB accuracy across 0–70°C ambient while operating from 3.3-V rail. |
Use Scenario: Shunt-based current sensing on three-phase inverter legs, with each phase's differential voltage routed to CH0–CH5. IC Role / Device Role / Timing Role: Configured for differential mode on adjacent channel pairs (CH0/CH1, CH2/CH3, CH4/CH5); SARS synchronizes MCU sampling to conversion completion. Use Value: Achieves 32 µs per conversion, enabling >30 kSPS aggregate sampling for real-time overcurrent protection. |
| Programmable Logic Controller (PLC) Input Module | Environmental Data Logger |
|
Use Scenario: Modular PLC backplane accepts analog field inputs (4–20 mA, 0–10 V) conditioned by external op-amps into TLV0838CPWG4. IC Role / Device Role / Timing Role: Operates ratiometrically with VCC reference; serial interface allows daisy-chaining multiple ADCs on shared bus. Use Value: Eliminates external reference ICs and simplifies BOM; TSSOP-20 footprint fits high-density I/O modules. |
Use Scenario: Battery-powered logger records soil moisture, light, and humidity from four analog sensors plus four spare channels for future expansion. IC Role / Device Role / Timing Role: Uses single-ended mode on CH0–CH3; enters low-power standby between conversions with <1 µA off-channel leakage. Use Value: 0.2 mA typical ICC extends 2xAA battery life to >1 year at 1 Hz sampling; small TSSOP package minimizes board area. |
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 |
|---|---|---|---|
| TLV0838IPWR | Same silicon, –40°C to 85°C extended temperature grade; identical pinout and electrical specs. | Required for automotive under-hood or outdoor industrial deployments outside 0–70°C range. | Select TLV0838IPWR when operating ambient exceeds 70°C or drops below 0°C; otherwise TLV0838CPWG4 suffices. |
| ADS7822U | 8-bit, 200 kSPS, SPI-compatible, 2.7–5.25 V supply; higher speed but no pseudodifferential COM pin. | Lacks COM-based pseudodifferential mode; requires external level-shifting for non-ground-referenced sensors. | Choose ADS7822U only if >31 kSPS sampling is mandatory and COM functionality is unnecessary. |
Compared with TLV0838IPWR, TLV0838CPWG4 offers identical performance at lower cost for commercial-temperature applications; compared with ADS7822U, it provides unique COM-based pseudodifferential capability critical for biased sensor interfaces, albeit at lower maximum throughput.
Availability
TLV0838CPWG4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) analog input modules, and battery-powered environmental data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TLV0838CPWG4 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 TLV0838CPWG4 belongs to TI's legacy low-voltage ADC family, engineered specifically for cost-sensitive, space-constrained 3-V systems requiring flexible analog input handling without external support components.
FAQ
What is the maximum clock frequency supported by TLV0838CPWG4?
The TLV0838CPWG4 supports up to 600 kHz clock frequency when VCC = 3.3 V, enabling faster conversion cycles than the base 250 kHz specification. At 2.7 V supply, maximum clock is 250 kHz. Clock duty cycle must remain between 40% and 60% for reliable operation across the full temperature range.
Does TLV0838CPWG4 require an external voltage reference?
No, TLV0838CPWG4 does not require an external voltage reference. It supports ratiometric operation using VCC as the reference, or accepts an external reference applied to the REF pin. When using VCC, the full-scale input range becomes 0 V to VCC, simplifying design in systems where reference stability is less critical than cost and board space.
How is pseudodifferential mode configured on TLV0838CPWG4?
Pseudodifferential mode on TLV0838CPWG4 is enabled by connecting the desired common-mode bias voltage to the COM pin and selecting any channel (CH0–CH7) as the positive input via the serial address word. The converter then measures each channel relative to COM, not ground - ideal for sensors biased above or below ground potential.
What is the function of the SE pin on TLV0838CPWG4?
The SE (Start LSB-First) pin on TLV0838CPWG4 controls serial output format. When held high, DO outputs MSB-first data. To enable LSB-first output, SE must be driven low before initiating conversion; the 9-bit shift register then clocks out data starting with the LSB. This feature supports legacy MCU firmware expecting LSB-first bit order.
Can TLV0838CPWG4 interface directly with a microcontroller GPIO without level-shifting?
Yes, TLV0838CPWG4 inputs and outputs are TTL- and MOS-compatible, with VIH = 2.0 V min and VIL = 0.8 V max at VCC = 3.3 V. Its VOH = 2.8 V min and VOL = 0.34 V max ensure reliable interfacing with standard 3.3-V microcontrollers without external level shifters or pull-up resistors.
TLV0838CPWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLV0838CPWG4 FAQ
1.How can I place an order for TLV0838CPWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV0838CPWG4 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 TLV0838CPWG4 reliable?
The price and inventory of TLV0838CPWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV0838CPWG4 is usually 5 days.
3.What payment methods are accepted for TLV0838CPWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV0838CPWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV0838CPWG4?
TLV0838CPWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV0838CPWG4 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 TLV0838CPWG4?
For technical support, including TLV0838CPWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV0838CPWG4 requirements.
6.How does Aetrix verify that TLV0838CPWG4 is sourced from the original manufacturer or authorized distributors?
All TLV0838CPWG4 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 TLV0838CPWG4 meets industry standards.
7.What is the process for return or replacement of TLV0838CPWG4?
All TLV0838CPWG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLV0838CPWG4, 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 TLV0838CPWG4 part is unused and in its original packaging.
Return procedure for TLV0838CPWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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