Texas Instruments TLV2548CPW

Overview

TLV2548CPW from Texas Instruments is a 12-bit, 200-KSPS successive-approximation analog-to-digital converter (ADC) with integrated reference, conversion clock, and 8-word FIFO. It operates from a single 2.7 V to 5.5 V supply, supports SPI/DSP-compatible serial interface up to 20 MHz, and features differential nonlinearity of ±1 LSB and SNDR of 70 dB at 12 kHz - used in industrial data acquisition systems requiring high-resolution sampling with low-power operation.

For engineers reviewing the TLV2548CPW datasheet, TLV2548CPW pinout, TLV2548CPW application, or TLV2548CPW equivalent, key selection considerations include its 20-pin TSSOP package, hardware- and software-controllable power-down modes (1 µA max), programmable auto-channel sweep, extended sampling via CSTART pin, and internal 2 V/4 V reference options - all critical for embedded sensor interface and real-time control designs.

Technical Context

The TLV2548CPW implements a charge redistribution SAR architecture with break-before-make analog multiplexer supporting eight single-ended or four differential inputs. Its conversion clock can be sourced from internal oscillator or external SCLK (divided by 1, 2, or 4), enabling configurable throughput up to 200 KSPS and minimum conversion time of 3.86 µs.

It integrates a 12-bit × 8 FIFO, configurable EOC/INT pin function, and three conversion modes (one-shot, repeat, sweep, repeat-sweep) with programmable FIFO trigger levels. Sampling period is selectable as short (12 SCLKs) or long (24 SCLKs), or fully hardware-controlled via asynchronous CSTART pin - supporting high-impedance sources and mixed-speed system interfaces.

Key Specifications

Pinout & Package

TLV2548CPW is housed in a 20-pin TSSOP (PW) package with 0.65-mm pitch, RoHS-compliant, and rated for 0°C to 70°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with TLV2548CPW, ADS7822U trades resolution and feature depth for cost and size, while TLV2544CPW retains full compatibility but reduces channel count and package size - both require revalidation of firmware channel mapping and layout.

Availability

TLV2548CPW is available at Aetrix Electronics and suitable for industrial sensor interface, motor control feedback, portable data logging, and energy metering front-end applications requiring stable component supply and long-term manufacturability.

Supply support for TLV2548CPW 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 focused on analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The TLV2548CPW belongs to TI's TLV254x family of low-power, high-performance SAR ADCs designed specifically for embedded industrial sensing, motor control, and portable instrumentation where resolution, flexibility, and power efficiency are critical.

FAQ

What is the maximum sampling rate achievable with the TLV2548CPW?

The TLV2548CPW achieves a maximum throughput of 200 KSPS when using an external 20-MHz SCLK with conversion clock source set to SCLK/1. This requires configuring the CFR register (bits D8–D7 = 01) and operating in normal sampling mode with short sampling period. At this rate, conversion time is 3.86 µs, and the device maintains ±1 LSB DNL and 70 dB SNDR performance per the datasheet.

Does the TLV2548CPW support differential input configurations?

Yes, the TLV2548CPW supports pseudo-differential and true-differential input modes using pairs of its analog inputs (e.g., A0–A1, A2–A3). The internal analog multiplexer allows selection of any two channels as differential pair, and the 500 kHz input bandwidth applies to the differential signal path. However, it does not implement a dedicated differential input stage - common-mode rejection relies on external circuitry and layout.

How does the CSTART pin function in extended sampling mode for the TLV2548CPW?

In extended sampling mode, the CSTART pin provides hardware-controlled sampling timing independent of SCLK. A falling edge on CSTART (with CS high) starts sampling; the low time determines sampling duration; a rising edge ends sampling and triggers conversion. This mode is mandatory for high-impedance sources (>1 kΩ) and requires internal reference selection (CFR D11 = 1) in sweep and repeat-sweep modes.

Can the TLV2548CPW operate with a 3.3-V supply and still use its internal reference?

Yes, the TLV2548CPW operates fully with a 3.3-V supply and supports both internal reference options: 2 V and 4 V. When using the 4-V internal reference, the analog input range remains 0 V to VCC (3.3 V), so full-scale codes correspond to 3.3 V - not 4 V - due to clamping by the supply rail. The 2-V option provides better headroom and linearity at 3.3 V, as confirmed in the datasheet's electrical characteristics table.

What are the FIFO depth and read behavior of the TLV2548CPW?

The TLV2548CPW includes a 12-bit × 8 deep FIFO that stores conversion results in sweep, repeat, and repeat-sweep modes. After reaching the programmed trigger level (full, 3/4, 1/2, or 1/4), the EOC/(INT) pin asserts. A FIFO read cycle outputs stored data MSB-first on SDO; each 16-bit transfer retrieves one 12-bit result plus 4 don't-care bits. The FIFO does not auto-clear - host must issue explicit read commands to avoid overflow.