Texas Instruments TLV1578CDA

Overview

TLV1578CDA from Texas Instruments is an 8-channel, 10-bit parallel analog-to-digital converter with integrated 8:1 analog multiplexer, internal oscillator, and hardware/software-configurable conversion control. It operates from a single 2.7 V to 5.5 V supply, delivers up to 1.25 MSPS throughput at 5 V, supports 0 V to AVDD analog input range, and features < ±1 LSB integral and differential nonlinearity - used in high-speed digital servo and process control data acquisition.

For engineers reviewing the TLV1578CDA datasheet, TLV1578CDA pinout, TLV1578CDA application, or TLV1578CDA equivalent, key selection considerations include its parallel interface timing compatibility with TMS320C6x DSPs, hardware CSTART-triggered sampling for high-impedance sources, channel sweep mode for multichannel monitoring, and dual power-down modes (1 mA auto, 10 µA software) for embedded system power management.

Technical Context

The TLV1578CDA implements a successive-approximation register (SAR) ADC using charge redistribution DAC architecture, requiring exactly 16 clock cycles per conversion (10 for conversion + 6 for sampling in software mode). Its internal 9–22 MHz oscillator or external 1–20 MHz clock drives all timing-critical operations including MUX switching, sampling, and data output latching.

Control logic includes two user-accessible registers (CR0 and CR1) that configure channel selection (CHSEL[2:0]), start mode (hardware CSTART vs. software WR/RD), output format (binary/twos complement), self-test activation, and internal/external clock source - all accessed via D9/A1–D8/A0 address lines and bidirectional D0–D9 data bus.

Key Specifications

Pinout & Package

TLV1578CDA is housed in a 32-pin TSSOP (DA package) with exposed thermal pad. Pin functions are validated per TI SLAS170D datasheet revision July 2000.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11607EEE+, the TLV1578CDA uniquely combines parallel interface, hardware CSTART timing control, and channel sweep mode - making it optimal for deterministic, high-speed multichannel acquisition in DSP-based motion control and industrial automation.

Availability

TLV1578CDA is available at Aetrix Electronics and suitable for mass storage, digital servos, and process control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TLV1578CDA 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 company specializing in analog, embedded processing, and digital signal processing technologies.

The TLV1578CDA belongs to TI's legacy high-speed data acquisition product line, designed specifically for cost-effective, low-power, multichannel analog front-ends in industrial and automotive real-time control systems.

FAQ

What is the maximum sampling rate achievable with the TLV1578CDA?

The TLV1578CDA achieves a maximum throughput rate of 1.25 MSPS when operated at 5 V with a 20 MHz external clock or fast internal oscillator. At 3 V, the maximum rate drops to 625 KSPS using a 10 MHz clock. Each conversion requires exactly 16 clock cycles - 6 for sampling and 10 for conversion - so actual system sampling rate depends on clock source stability and interface timing margins. The TLV1578CDA datasheet confirms this timing behavior in Figure 4 and Table 1.

Does the TLV1578CDA support true differential input operation?

No, the TLV1578CDA does not support true differential analog inputs. It accepts only single-ended inputs across CH0–CH7 (or AIN for TLV1571), with full-scale range defined by the voltage difference between REFP and REFM. While REFM can be set above ground (e.g., 1.0 V) to create a pseudo-differential offset, the ADC core itself performs unipolar conversion referenced to REFM. This is explicitly stated in the "Reference Voltage Input" section of the TLV1578CDA datasheet (SLAS170D, p.8).

How is channel selection implemented in the TLV1578CDA?

Channel selection in the TLV1578CDA is controlled via bits CHSEL[2:0] (CR1.D2–D0) in Control Register 1. These bits define which of the eight analog inputs (CH0–CH7) is routed through the internal MUX to the ADC core. In sweep mode (CR0.D3 = 1), the device automatically sequences through a programmable subset - e.g., CH0→CH1→CH2 - based on CHSEL[2:0] value. The TLV1578CDA functional block diagram (p.3) and Table 1 (p.6) confirm this register-controlled MUX behavior.

Can the TLV1578CDA operate without an external clock source?

Yes, the TLV1578CDA includes an internal oscillator (9–22 MHz) that can serve as the SYSCLK source when CR0.D5 = 0. The oscillator starts automatically on the falling edge of CSTART, WR, or RD and disables after each conversion. Its frequency is selectable via CR1.D6 (fast/slow mode), enabling flexible timing without external crystal or clock generator - a capability confirmed in the "Internal Clock" section (p.11) and Figure 5 of the TLV1578CDA datasheet.

What is the purpose of the MO pin on the TLV1578CDA?

MO (MUX Output) provides direct access to the output node of the internal 8:1 analog multiplexer, upstream of the ADC core. This allows designers to insert external signal conditioning - such as anti-aliasing filters or gain amplifiers - between the MUX and ADC, enabling shared circuitry for all eight channels. The TLV1578CDA datasheet describes this architecture in the "Description" section (p.1) and functional block diagram (p.3), emphasizing MO's role in reducing component count and board area.