TLV5636

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

CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN

SLAS223 – JUNE 1999

10

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

Figure 12

–4.0

–3.0

–2.0

–1.0

0.0

1.0

2.0

3.0

4.0

0

4096

Digital Input Code

INTEGRAL NONLINEARITY

vs

DIGITAL INPUT CODE

1024

2048

3072

APPLICATION INFORMATION

general function

The TLV5636 is a 12-bit, single supply DAC, based on a resistor string architecture. It consists of a serial

interface, a speed and power-down control logic, a programmable internal reference, a resistor string, and a

rail-to-rail output buffer.

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

2REF

CODE

0x1000

[V]

Where REF is the reference voltage and CODE is the digital input value in the range 0x000 to 0xFFF. A power

on reset initially puts the internal latches to a defined state (all bits zero).

serial interface

The device has to be enabled with CS set to low. A falling edge of FS starts shifting the data bit-per-bit (starting

with the MSB) to the internal register on high-low transitions 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 TLV5636 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). Figure 13 shows an example with two TLV5636s connected directly

to a TMS320 DSP.