LTC2415IGN datasheet(10/40 Pages) LINER

10 / 40 page

LTC2415/LTC2415-1

sn2415 24151fs

GND (Pins 1, 7, 8, 9, 10, 15, 16): Ground. Multiple ground

pins internally connected for optimum ground current flow

and VCC decoupling. Connect each one of these pins to a

ground plane through a low impedance connection. All seven

pins must be connected to ground for proper operation.

VCC (Pin 2): Positive Supply Voltage. Bypass to GND

(Pin 1) with a 10

µF tantalum capacitor in parallel with

0.1

µF ceramic capacitor as close to the part as possible.

REF+ (Pin 3), REF– (Pin 4): Differential Reference Input.

The voltage on these pins can have any value between GND

and VCC as long as the reference positive input, REF+, is

maintained more positive than the reference negative

input, REF –, by at least 0.1V.

IN+ (Pin 5), IN– (Pin 6): Differential Analog Input. The

voltage on these pins can have any value between

GND – 0.3V and VCC + 0.3V. Within these limits the

converter bipolar input range (VIN = IN+ – IN–) extends

from – 0.5 • (VREF) to 0.5 • (VREF). Outside this input range

the converter produces unique overrange and underrange

output codes.

CS (Pin 11): Active LOW Digital Input. A LOW on this pin

enables the SDO digital output and wakes up the ADC.

Following each conversion, the ADC automatically enters

the Sleep mode and remains in this low power state as

long as CS is HIGH. A LOW-to-HIGH transition on CS

during the Data Output transfer aborts the data transfer

and starts a new conversion.

SDO (Pin 12): Three-State Digital Output. During the Data

Output period, this pin is used as serial data output. When

the chip select CS is HIGH (CS = VCC) the SDO pin is in a

high impedance state. During the Conversion and Sleep

periods, this pin is used as the conversion status output.

The conversion status can be observed by pulling CS LOW.

SCK (Pin 13): Bidirectional Digital Clock Pin. In Internal

Serial Clock Operation mode, SCK is used as digital output

for the internal serial interface clock during the Data

Output period. In External Serial Clock Operation mode,

SCK is used as digital input for the external serial interface

clock during the Data Output period. A weak internal pull-

up is automatically activated in Internal Serial Clock Op-

eration mode. The Serial Clock Operation mode is deter-

mined by the logic level applied to the SCK pin at power up

or during the most recent falling edge of CS.

PI FU CTIO S

TYPICAL PERFOR A CE CHARACTERISTICS

OUTPUT DATA RATE (READINGS/SEC)

010 20 30 40 50 60 70 80 90 100

2415 G37

1000

900

800

700

600

500

400

300

200

100

VCC = 5V

REF+ = 5V

REF– = GND

IN+ = GND

IN– = GND

FO = EXT OSC

CS = GND

SCK =N/C

SDO = N/C

TEMPERATURE (

°C)

–45 –30 –15

2415 G38

VREF

+ = V

VREF

– = GND

VIN

+ = V

– = GND

FO = GND

CS = VCC

SCK = SDO = N/C

VCC = 5.5V

VCC = 4.1V

VCC = 2.7V

Conversion Current vs Output

Data Rate

Sleep Current vs

Temperature (TA)

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