TLV5616C, TLV5616I

2.7 V TO 5.5 V LOW POWER 12-BIT DIGITAL-TO-ANALOG

CONVERTERS WITH POWER DOWN

SLAS152B – DECEMBER 1997 – REVISED MARCH 1999

11

POST OFFICE BOX 655303

APPLICATION INFORMATION

general function

The TLV5616 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

0x1000

[V]

Where REF is the reference voltage and CODE is the digital input value within the range of 0x000 to 0xFFF.

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 TLV5616 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 family. Figure 15 shows

an example with two TLV5616s connected directly to a TMS320 DSP.

TMS320

DSP

XF0

XF1

FSX

DX

CLKX

TLV5616

CS FS DIN SCLK

TLV5616

CS FS DIN SCLK

Figure 15. TMS320 Interface