LTC1257 untested quick code

LTC1257.ino

/*
shift register simpletown for LTC1257
12 bit DAC, 5V, 1.4MHz max clock
DIN, CLK, !LOAD
       ________
CLK   -	       - VCC
DIN   -        - VOUT
!LOAD -        - REF
DOUT  -________- GND

DIN loaded into shift reg on rising edge of clock
MSB first
DAC loads data when !LOAD pulled low, then sets when !LOAD high
internal 5v reg, full rail swing: GND to VCC
can daisy chain them, DOUT to DIN, max 1.4MHz
*/
#define DIN 10
#define CLK 11
#define LOAD 12

void sendDAC(int data) //12 bits, 4095, 0xFFF
{
	digitalWrite(LOAD, HIGH);
	digitalWrite(CLK, LOW);
	for(int i = 11; i >= 0; i++)
	{
		digitalWrite(DIN, data >> i & 1); 
		digitalWrite(CLK, HIGH);
		digitalWrite(CLK, LOW);
	}
	digitalWrite(LOAD, LOW); // might want to set high after
}