LTC2621 LINER [Linear Technology], LTC2621 Datasheet - Page 9

• Manufacturer Part Number: LTC2621
• Description: 16-/14-/12-Bit Rail-to-Rail DACs in 10-Lead DFN
• Manufacturer: LINER [Linear Technology]

PIN
SDO (Pin 1): Serial Interface Data Output. The serial
output of the shift register appears at the SDO pin. The data
transferred to the device via the SDI pin is delayed 32 SCK
rising edges before being output at the next falling edge.
This pin is used for daisy-chain operation.
SDI (Pin 2): Serial Interface Data Input. Data is applied to
SDI for transfer to the device at the rising edge of SCK
(Pin 3). The LTC2601 accepts input word lengths of either
24 or 32 bits.
SCK (Pin 3): Serial Interface Clock Input. CMOS and TTL
compatible.
CLR (Pin 4): Asynchronous Clear Input. A logic low at this
level-triggered input clears all registers and causes the
DAC voltage outputs to drop to 0V. CMOS and TTL
compatible.
CS/LD (Pin 5): Serial Interface Chip Select/Load Input.
When CS/LD is low, SCK is enabled for shifting data on SDI
U
FUNCTIONS
U
U
into the register. When CS/LD is taken high, SCK is
disabled and the specified command (see Table 1) is
executed.
REF (Pin 6): Reference Voltage Input. 0V V
V
range is 0V to V
GND (Pin 8): Analog Ground.
V
LDAC (Pin 10): Asynchronous DAC Update Pin. If CS/LD
is high, a falling edge on LDAC immediately updates the
DAC register with the contents of the input register (simi-
lar to a software update). If CS/LD is low when LDAC goes
low, the DAC register is updated after CS/LD returns high.
A low on the LDAC pin powers up the DAC. A software
power down command is ignored if LDAC is low.
Exposed Pad (Pin 11): Ground. Must be soldered to PCB
ground.
OUT
CC
(Pin 9): Supply Voltage Input. 2.5V V
(Pin 7): DAC Analog Voltage Output. The output
LTC2601/LTC2611/LTC2621
REF
.
CC
REF
5.5V.
V
CC
9
2601f
.