Texas Instruments TLV1549CPE4

Overview

TLV1549CPE4 from Texas Instruments is a 10-bit switched-capacitor successive-approximation analog-to-digital converter (ADC) with integrated sample-and-hold, 3.3-V supply operation, ±1 LSB total unadjusted error, and three-wire serial interface (CS, I/O CLOCK, DATA OUT). It operates from 0°C to 70°C and supports ratiometric conversion via differential reference inputs (REF+, REF–), commonly used in industrial sensor signal conditioning and microcontroller-based data acquisition.

For engineers reviewing the TLV1549CPE4 datasheet, TLV1549CPE4 pinout, TLV1549CPE4 application, or TLV1549CPE4 equivalent, key selection considerations include its 21 μs conversion time, 2.1 MHz max I/O CLOCK frequency, 30–55 pF analog input capacitance, CMOS-compatible 3-state output drive, and compatibility with TLC1549-series host interfaces.

Technical Context

The TLV1549CPE4 implements a charge-redistribution successive-approximation architecture with an on-chip system clock and automatic sampling triggered on the third falling edge of I/O CLOCK, holding on the tenth. Its differential high-impedance reference inputs enable precise ratiometric scaling and noise isolation between analog and digital domains.

It supports six serial timing modes-three fast (≤21 μs post-tenth-clock MSB valid) and three slow-with configurable CS behavior (toggled or held low) and I/O CLOCK counts (10 to 16). The device uses internal binary-weighted capacitor arrays and a CMOS threshold detector to resolve bits from MSB to LSB without external components.

Key Specifications

Pinout & Package

TLV1549CPE4 is packaged in an 8-pin plastic DIP (P package), pin-compatible with TLC1549-series devices. Pin functions are electrically validated per TI SLAS071C datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit serial-output ADC applications.

Compared with TLC1549CD and ADS7822U, the TLV1549CPE4 uniquely balances 3.3-V compatibility, proven industrial reliability, and drop-in replaceability in TLC1549 footprints-making it optimal for cost-sensitive, low-to-moderate-speed 10-bit applications where supply voltage and timing simplicity are critical.

Availability

TLV1549CPE4 is available at Aetrix Electronics and suitable for industrial sensor interface, portable data logging, motor control feedback, medical instrumentation, and embedded telemetry applications requiring stable component supply and long-term manufacturability.

Supply support for TLV1549CPE4 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, embedded processing, and connectivity technologies, with decades of heritage in precision data converters and industrial-grade ICs.

The TLV1549CPE4 belongs to TI's legacy 10-bit serial ADC product line, designed specifically for cost-effective, low-power, microcontroller-coupled data acquisition in industrial, medical, and instrumentation systems operating at 3.3 V.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLV1549CPE4?

The TLV1549CPE4 supports a maximum I/O CLOCK frequency of 2.1 MHz under recommended operating conditions (VCC = 3.0–3.6 V, TA = 0°C to 70°C). Exceeding this limit may cause timing violations, incomplete sampling, or invalid data output. Pulse widths must remain ≥190 ns high and low, and transition times ≤1 μs for reliable operation.

Does the TLV1549CPE4 require an external clock source?

No, the TLV1549CPE4 contains an on-chip system clock and does not require an external crystal or oscillator. All timing-including sampling, conversion, and serial output-is derived internally and synchronized to the externally applied I/O CLOCK signal, which serves only as a serial interface timing reference.

Can the TLV1549CPE4 operate with a 2.5-V reference voltage?

Yes, the TLV1549CPE4 supports differential reference voltages from 2.5 V to VCC (up to 3.6 V), as specified in the recommended operating conditions. A 2.5-V REF+ (with REF– = GND) yields a 2.5-V full-scale input range and 2.44 mV/LSB step size, fully compliant with its electrical specifications.

Is the TLV1549CPE4 pin-compatible with the TLC1549 series?

Yes, the TLV1549CPE4 is terminal-compatible with the TLC1549 and TLC1549x devices in the same 8-pin DIP (P) package. This allows direct PCB replacement in existing designs, though voltage translation may be needed when interfacing with 5-V TLC1549 systems due to the TLV1549CPE4's 3.3-V supply constraint.

What is the analog input impedance during sampling mode for the TLV1549CPE4?

During sampling mode, the TLV1549CPE4 presents an effective analog input impedance of approximately 1 kΩ in series with 60 pF equivalent input capacitance (Ci), as documented in the datasheet's "typical equivalent inputs" section. This requires the driving source to have ≤1 kΩ output impedance and ≥10 mA current capability to ensure accurate settling before hold.