LTC2949 datasheet(11/80 Pages) AD

11 / 80 page

LTC2949

Rev A

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TYPICAL PERFORMANCE CHARACTERISTICS

VREF vs Temperature

VREF Load Regulation

VREF2 vs Temperature

AVCC/DVCC Supply Current

Standby/Measure vs Temperature

AVCC/DVCC Supply Current vs

Temperature

TEMPERATURE (°C)

–50 –25

100 125

2.996

2.997

2.998

2.999

3.000

3.001

3.002

3.003

3.004

3.005

3.006

vs Temperature

VREF

2949 G10

125°C

85°C

25°C

–40°C

VREF LOAD CURRENT (mA)

–0.1

–0.2

–0.3

–0.4

–0.5

–2.5

–2.0

–1.5

–1.0

–0.5

0.5

1.0

VREF Load Regulation

2949 G11

TEMPERATURE (°C)

–50 –25

100 125

2.375

2.380

2.385

2.390

2.395

2.400

2.405

VREF2 vs Temperature

2949 G12

Standby/Measure, VAVCC=VDVCC=14V

TEMPERATURE (°C)

–50 –25

100 125

Standby/Measure vs Temperature

AVCC/DVCC Supply Current

2949 G13

Sleep Mode, VAVCC = VDVCC = 14V

TEMPERATURE (°C)

–50 –25

100 125

100

vs Temperature

AVCC/DVCC Supply Current

2949 G14

PIN FUNCTIONS

AVCC (Pin 19): Analog Supply Voltage. Bypass this pin to

AGND with a 0.1μF (or greater) capacitor. AVCC operating

range is 4.5V to 14V.

AGND (Pin 18): Analog Ground. Bypass this pin to AVCC

with a 0.1μF (or greater) capacitor.

BYP1 (Pin 16): Internal Supply Voltage. Bypass BYP1 to

DGND with a 1μF capacitor. BYP1 is regulated to 2.5V. Can

supply external circuitry (example EEPROM) with up to

10mA. Overloading might disrupt LTC2949 functionality.

BYP2 (Pin 25): Internal 3.25V Supply Voltage. Bypass

BYP2 to DGND with a 1μF capacitor. Can supply external

circuitry (example SPI isolator ADuM141E or ADuM4154)

with up to 10mA. Overloading might disrupt LTC2949

functionality.

CF1P, CF1M (Pins 44, 43): Filter Capacitor Inputs for the

first current channel. Connect a 1µF capacitor between

CF1P and CF1M for filtering differential noise and fast cur-

rent variations. Connect 0.1µF capacitors between AGND

and the filter pins for damping high frequency common

mode variations.

LTC2949 Datasheet(PDF) 11 Page - Analog Devices

LTC2949 Datasheet(HTML) 11 Page - Analog Devices

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