Texas Instruments TLV2548CDWR

Overview

TLV2548CDWR from Texas Instruments is a 12-bit, 200-KSPS SAR analog-to-digital converter with built-in reference, conversion clock, and 8× FIFO. It operates from a single 2.7-V to 5.5-V supply, supports SPI/DSP serial interfaces up to 20-MHz SCLK, and features differential/integral nonlinearity of ±1 LSB - used in industrial data acquisition systems requiring high-resolution sampling with low-power operation.

For engineers reviewing the TLV2548CDWR datasheet, TLV2548CDWR pinout, TLV2548CDWR application, or TLV2548CDWR equivalent, key selection considerations include its 8-channel analog multiplexer, programmable auto-sweep modes, extended sampling via CSTART pin, hardware/software power-down (1 µA max), and compatibility with TI DSPs via FS frame sync.

Technical Context

The TLV2548CDWR implements a charge redistribution SAR architecture with internal 4-V or 2-V reference selection and configurable conversion clock sourcing (internal OSC, SCLK, SCLK/2, or SCLK/4). Its analog multiplexer supports eight single-ended inputs or three internal test voltages, with break-before-make switching to minimize inter-channel crosstalk.

Sampling is programmable for 12 or 24 SCLK cycles, or fully asynchronous via the CSTART pin - enabling precise control over acquisition time independent of serial clock rate. Conversion modes include one-shot, repeat, sweep, and repeat-sweep, with FIFO-triggered interrupt generation at user-defined fill levels (1/4, 1/2, 3/4, or full).

Key Specifications

Pinout & Package

TLV2548CDWR is packaged in a 20-pin SOIC (DW) body with 0.300-inch width, RoHS-compliant lead finish, and operating temperature range of 0°C to 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2548CDWR, ADS7822U trades resolution and integration for lower cost and smaller size, while TLV2544CDW retains full feature parity in a reduced-channel form - both serve distinct cost-channel-performance trade-offs without altering PCB layout.

Availability

TLV2548CDWR is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, portable data loggers, and TI C2000 DSP interfacing requiring stable component supply and long-term production continuity.

Supply support for TLV2548CDWR 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 - serving industrial, automotive, and communications markets since 1930.

The TLV2548CDWR belongs to TI's precision data acquisition portfolio, designed specifically for low-power, high-resolution industrial sensing and real-time control applications where integration, timing flexibility, and robust serial interfacing are critical.

FAQ

What is the maximum sampling rate achievable with the TLV2548CDWR?

The TLV2548CDWR achieves a maximum throughput of 200 KSPS when using an external 20-MHz SCLK as the conversion clock source, resulting in a 2.8-µs conversion time. This rate assumes short sampling (12 SCLKs) and internal oscillator bypass. At lower SCLK frequencies or with long sampling enabled, the effective rate decreases proportionally - e.g., 10-MHz SCLK yields ~100 KSPS under identical conditions. The device's 500-kHz analog input bandwidth supports this performance without aliasing for baseband signals.

Does the TLV2548CDWR require an external reference voltage?

No, the TLV2548CDWR does not require an external reference voltage. It integrates a selectable 4-V or 2-V internal reference, configured via CFR bit D10. When using the internal reference, REFM must be tied to analog ground and REFP left floating or decoupled per datasheet guidelines. An external reference may be applied across REFP and REFM for improved accuracy or custom voltage scaling - but this disables the internal reference and increases component count and layout sensitivity.

How does the CSTART pin function in the TLV2548CDWR?

The CSTART pin provides hardware-controlled, asynchronous sampling initiation in the TLV2548CDWR. Its low-time directly defines the sampling period - independent of SCLK frequency - making it ideal for high-impedance sources (>1 kΩ) or variable timing constraints. A falling edge starts sampling; a rising edge ends sampling and triggers conversion. CSTART operation requires internal reference selection and is supported in repeat, sweep, and repeat-sweep modes. It cannot be used simultaneously with FS-triggered operation.

Can the TLV2548CDWR interface directly with Texas Instruments C2000 microcontrollers?

Yes, the TLV2548CDWR interfaces directly with TI C2000 microcontrollers (e.g., F28004x, F2837x) using its dedicated FS (frame sync) pin. When FS is asserted low, the device enters DSP-compatible mode: CS can remain continuously low, and serial transfers align to frame boundaries. This eliminates the need for bit-banged GPIO timing or complex SPI configuration - enabling deterministic, low-latency data capture synchronized to PWM or control loop execution in real-time motor control applications.

What are the power consumption characteristics of the TLV2548CDWR in active and power-down states?

In active operation, the TLV2548CDWR draws 1.0 mA at 3.3 V (with external reference) and 1.1 mA at 5.5 V. In hardware power-down mode (PWDN = low), quiescent current drops to ≤1 µA - verified across the full 0°C to 70°C temperature range. Software power-down (via command 0x8) and autopower-down (after conversion completion) achieve identical 1-µA draw. All power-down states retain configuration register (CFR) contents, allowing immediate resumption of prior settings upon wake-up without reinitialization.