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TYPICAL PERFORMANCE CHARACTERISTICS
VREF
VREF vs Temperature
vs Temperature
3.006
3.005
3.004
3.003
3.002
3.001
3.000
2.999
2.998
2.997
2.996
–50
–25
0
25
50
TEMPERATURE (°C)
AVCC/DVCC Supply Current
AVCC/DVCC Supply Current
Standby/Measure vs Temperature
Standby/Measure vs Temperature
25
20
15
10
5
–50
–25
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.
VREF Load Regulation
V
Load Regulation
REF
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
0
–0.1
75
100
125
2949 G10
Standby/Measure, V
=V
=14V
AVCC
DVCC
0
25
50
75
100
125
TEMPERATURE (°C)
2949 G13
For more information
125°C
85°C
25°C
–40°C
–0.2
–0.3
–0.4
–0.5
V
LOAD CURRENT (mA)
REF
2949 G11
AVCC/DVCC Supply Current vs
AVCC/DVCC Supply Current
Temperature
vs Temperature
1k
Sleep Mode, V
100
10
1
–50
–25
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.
www.analog.com
LTC2949
VREF2 vs Temperature
VREF2 vs Temperature
2.405
2.400
2.395
2.390
2.385
2.380
2.375
–50
–25
0
25
50
TEMPERATURE (°C)
= V
= 14V
AVCC
DVCC
0
25
50
75
100
125
TEMPERATURE (°C)
2949 G14
75
100
125
2949 G12
Rev A
11
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