TLV5614EP

2.7V TO 5.5V 12BIT 3 µs QUADRUPLE DIGITALTOANALOG CONVERTER

WITH POWER DOWN

SGLS355 − JUNE 2006

13

POST OFFICE BOX 655303

APPLICATION INFORMATION

general function

The TLV5614 is a 12-bit single-supply DAC based on a resistor string architecture. The device consists of a

serial interface, speed and power-down control logic, a reference input buffer, a resistor string, and a rail-to-rail

output buffer.

The output voltage (full scale determined by external reference) is given by:

2REF

CODE

2n

[V]

n = 12 (bits). The 16-bit data word, consisting of control bits and the new DAC value, is illustrated in the data

format section. A power-on reset initially resets the internal latches to a defined state (all bits zero).

serial interface

Explanation of data transfer: First, the device has to be enabled with CS set to low. Then, a falling edge of FS

starts shifting the data bit per bit (starting with the MSB) to the internal register on the falling edges of SCLK.

After 16 bits have been transferred or FS rises, the content of the shift register is moved to the DAC latch, which

updates the voltage output to the new level.

The serial interface of the TLV5614 can be used in two basic modes:

Using chip select (four-wire mode), it is possible to have more than one device connected to the serial port of

the data source (DSP or microcontroller). The interface is compatible with the TMS320 DSP family. Figure 16

shows an example with two TLV5614s connected directly to a TMS320 DSP.

TMS320

DSP

XF0

XF1

FSX

DX

CLKX

TLV5614

CS FS DIN SCLK

TLV5614

CS FS DIN SCLK

Figure 16. TMS320

E Interface

TMS320 is a trademark of Texas Instruments.