TLV1549CD - 10-Bit 38 kSPS SAR ADC | Texas Instruments
MPN: TLV1549CD ✓ ActiveTLV1549CD Overview
An analog-to-digital converter, or ADC, converts a continuous analog voltage into a numeric code. The TLV1549 belongs to the SAR ADC hierarchy, where a switched-capacitor internal network samples the input and successive comparison steps determine the digital result. The 10-bit resolution provides 1024 output codes, while the 38 kSPS sampling rate is appropriate for industrial control, instrumentation, sensor acquisition, and embedded measurement systems. Its inherent sample-and-hold function helps simplify front-end signal conditioning.
The TLV1549CD provides one analog input, a serial data output, and a three-state output controlled by chip select. The interface is designed for connection to microcontrollers, programmable logic controllers, and other serial peripherals. The 8-pin SOIC package supports conventional surface-mount assembly and provides a compact footprint for small control boards. The device is identified as compatible with TLC1549 and TLC1549x terminal arrangements, supporting design continuity with related TI converter families.
Typical uses include proportional temperature and pressure monitoring, potentiometer position sensing, battery voltage measurement, process-control instrumentation, and low-speed factory automation. In these applications, the ADC is generally preceded by buffering, filtering, and input-range conditioning to protect the analog input and provide a signal that fits the converter’s input range. The serial interface reduces the number of signal lines required compared with a parallel-output ADC.
Designers should verify the analog input range, reference voltage behavior, conversion timing, and digital logic levels from the manufacturer datasheet before finalizing a PCB layout. Keep the analog input and reference paths away from fast digital clock traces, provide local bypass capacitance at the supply pins, and account for source impedance and acquisition time. The compact SOIC package is not an SOA-rated power device, so SOA information is not applicable.
Drop-in alternatives for TLV1549CD — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLV1549CD (same form factor and footprint) — differing in Package, Resolution, ADC Type, Input Type, Interface Signals.
TLV1549ID
✅ Drop-InContact for price
View Datasheet →TLV1549IDG4
✅ Drop-In📋 Reference alternative (not in catalog)
TLV1549CDG4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLC1549ID
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLC1549IDG4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLV1549CD Maximum Ratings & Electrical Characteristics
| ADC Type | Switched-capacitor successive-approximation ADC |
| Resolution | 10 bit |
| Conversion Rate | 38 kSPS |
| Analog Input Count | 1 input |
| Output Type | Serial output |
| Sample-and-Hold | Inherent |
| Interface Signals | Chip select, input/output clock, and data output |
| Package | 8-pin SOIC (D) |
| Operating Temperature | -40 °C to +85 °C |
| Terminal Compatibility | Compatible with TLC1549 and TLC1549x |
| Technology | Switched-capacitor SAR conversion |
| Mounting Type | Surface Mount |
| Manufacturer | Texas Instruments |
| Product Type | Analog-to-digital converter |
| Output Resolution Codes | 1024 codes |
TLV1549CD Pin Configuration
| Pin 1 | REF+ — Positive reference input |
| Pin 2 | ANALOG IN — Single analog input |
| Pin 3 | REF- — Negative reference input |
| Pin 4 | GND — Ground |
| Pin 5 | CS — Active-low chip-select input |
| Pin 6 | I/O CLOCK — Input/output clock |
| Pin 7 | DATA OUT — Three-state serial data output |
| Pin 8 | VCC — Positive supply voltage |
Typical Applications
TLV1549CD is suitable for 6 applications: Industrial Temperature Monitoring, Pressure and Process Control, Potentiometer Position Sensing, Battery Voltage Monitoring, Programmable Logic Controller Acquisition, Embedded Instrumentation.
Industrial Temperature Monitoring
The TLV1549CD fits industrial temperature-monitoring designs that require a compact, serial-interface ADC. Its 10-bit resolution provides 1024 digital codes, while the 38 kSPS conversion rate is more than sufficient for thermal signals that change slowly. Place the sensor behind suitable buffering and filtering, then connect the analog input to the ADC and read the serial data through the chip-select and input/output-clock interface. The -40 °C to +85 °C operating range supports temperature-qualified equipment, while the 8-pin SOIC package simplifies surface-mount layouts. The principal design consideration is preserving signal integrity from the sensor to the analog input and verifying the input range and reference behavior against the datasheet.
Recommended
Pressure and Process Control
The TLV1549CD is suitable for low-speed pressure, flow, and process-control instrumentation where the measured signal is analog and the controller interface can be serial. The 38 kSPS sampling rate allows frequent updates without the complexity of a parallel data bus, while the 10-bit resolution provides a practical balance between resolution and system complexity. Condition the transducer output with a low-noise amplifier and anti-alias filter before the ADC input. The serial chip-select, clock, and data signals reduce PCB routing requirements around an embedded controller, and the SOIC-8 package is easy to place by standard surface-mount assembly methods.
Recommended
Potentiometer Position Sensing
The TLV1549CD can digitize potentiometer or rotary position signals in industrial controls and panel interfaces. A 10-bit SAR ADC provides 1024 levels, which is often appropriate for basic position indication, while the 38 kSPS rate supports responsive updates as the mechanical input changes. The single analog input keeps the circuit small, and the serial interface avoids dedicating multiple microcontroller I/O pins. A resistor divider, input protection network, and optional filtering should be used to keep the analog signal within the converter input range. Designers should also check the allowed source impedance and acquisition time in the manufacturer datasheet.
Recommended
Battery Voltage Monitoring
The TLV1549CD is applicable to battery-powered equipment that needs a compact voltage-monitoring channel. Its single input can receive a scaled battery voltage, and its 10-bit result provides sufficient resolution for charge-state estimation, threshold detection, and system telemetry. The 38 kSPS rate supports more frequent updates than many slow monitoring systems, although periodic conversion may be preferable for maximizing battery life. Use a resistive divider with appropriately selected values, add input filtering, and verify the absolute maximum input voltage. The 8-pin SOIC package leaves board area for protection, regulation, and communications components.
Recommended
Programmable Logic Controller Acquisition
The TLV1549CD is appropriate for PLC and embedded automation modules requiring one analog measurement channel. Its serial interface uses chip select, input/output clock, and data output, reducing the number of connections between the converter and a controller compared with a parallel ADC. The 10-bit resolution and 38 kSPS conversion rate align with many slowly changing process signals, including temperature, level, and actuator feedback. Place the ADC close to the controlled analog node, bypass the supply locally, and isolate the analog trace from switching-node and high-current paths. Verify logic levels and timing with the host controller before production release.
Recommended
Embedded Instrumentation
The TLV1549CD supports compact embedded instrumentation where a single analog channel must be converted to serial data. Its switched-capacitor SAR architecture, inherent sample-and-hold function, and 38 kSPS rate make it suitable for frontend conditioning, threshold comparison, and slow measurement loops. The 10-bit result is useful when the application emphasizes system size and interface simplicity rather than laboratory-grade resolution. Use an input buffer when the sensor has high output impedance, add filtering to control out-of-band noise, and route the clock away from the analog input. The 8-pin SOIC package is compatible with automated assembly and supports compact instrumentation enclosures.
Recommended
Recommended Products Summary
Engineering reference data for TLV1549CD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLV1549ID | TLV1549IDG4 | TLV1549CDG4 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit |
| Conversion Rate | 38 kSPS | 38 kSPS | 38 kSPS | 38 kSPS |
| ADC Architecture | Switched-capacitor SAR | Switched-capacitor SAR | Switched-capacitor SAR | Switched-capacitor SAR |
| Analog Input Count | 1 input | 1 input | 1 input | 1 input |
| Output Interface | Serial output | Serial output | Serial output | Serial output |
| Sample-and-Hold | Inherent | Inherent | Inherent | Inherent |
Key Differentiators
- Compact serial interface (vs A parallel 10-bit ADC)
- Moderate measurement throughput (vs A high-speed flash ADC)
- Single analog input with inherent sampling (vs A multiplexed multi-channel ADC)
Design Notes
Place the TLV1549CD close to the analog source and its bypass capacitor, and route the analog input away from the input/output clock and other digital switching traces. The verified interface uses a shared clock/data control arrangement, so clock edges can couple into a high-impedance analog node. Use a compact layout, provide a solid ground reference, and keep the analog trace as short as practical.
Use the manufacturer-specified supply bypass capacitor at VCC and place it adjacent to the supply and ground pins. Do not assume that the 3.3 V wording in a distributor listing applies to every ordering suffix; verify the TLV1549CD supply limits in the datasheet. Stable local supply decoupling reduces conversion error and prevents digital activity on the clock bus from affecting the reference and sampled signal.
Do not treat the 10-bit conversion result as 12-bit or 16-bit accuracy. Input noise, reference instability, source impedance, and inadequate acquisition time can reduce real-world precision even though the converter provides 1024 output codes. Condition high-impedance sensors with a suitable buffer, and compare the complete measurement chain against the required accuracy rather than relying only on nominal ADC resolution.
Compliance Information
The verified web results do not provide compliance statements for this exact ordering suffix. Compliance values remain unknown rather than being assumed.