LTC1655LIN8 datasheet(8/16 Pages) LINER

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LTC1655/LTC1655L

PIN FUNCTIONS

CLK (Pin 1): The TTL Level Input for the Serial Interface

Clock.

DIN (Pin 2): The TTL Level Input for the Serial Interface

Data. Data on the DIN pin is latched into the shift register

on the rising edge of the serial clock and is loaded MSB

first. The LTC1655/LTC1655L requires a 16-bit word.

CS/LD (Pin 3): The TTL Level Input for the Serial Inter-

face Enable and Load Control. When CS/LD is low, the

CLK signal is enabled, so the data can be clocked in.

When CS/LD is pulled high, data is loaded from the shift

DOUT (Pin 4): Output of the Shift Register. Becomes valid

on the rising edge of the serial clock and swings from GND

to VCC.

GND (Pin 5): Ground.

REF (Pin 6): Reference. Output of the internal reference is

2.048V (LTC1655), 1.25V (LTC1655L). There is a gain of

two from this pin to the output. The reference can be

overdriven from 2.2V to VCC/2 (LTC1655) and 1.3V to

VCC/2 (LTC1655L). When tied to VCC/2, the output will

swing from GND to VCC. The output can only swing to

within its offset specification of VCC (see Applications

Information).

VOUT (Pin 7): Deglitched Rail-to-Rail Voltage Output. VOUT

clears to 0V on power-up.

VCC (Pin 8): Positive Supply Input. 4.5V ≤ VCC ≤ 5.5V

(LTC1655), 2.7V

≤ VCC ≤ 5.5V (LTC1655L). Requires a

0.1

µF bypass capacitor to ground.

TI I G DIAGRA

D15

MSB

D14

D13

LSB

t 8

CLK

DIN

DOUT

CS/LD

1655/55L TD

D15

PREVIOUS WORD

D14

PREVIOUS WORD

D15

CURRENT WORD

D13

PREVIOUS WORD

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