Datasheet

LTC2977
6
2977fa
For more information www.linear.com/LTC2977
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
PWR
= V
IN_SNS
= 12V; V
DD33
, V
DD25
, REFP and REFM pins floating,
unless otherwise indicated. C
VDD33
= 100nF, C
VDD25
= 100nF and C
REF
= 100nF.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
C
IN_ADC
Input Sampling Capacitance 1 pF
f
IN_ADC
Input Sampling Frequency 62.5 kHz
I
IN_ADC
Input Leakage Current V
IN_ADC
= 0V, 0V ≤ V
COMMONMODE
≤ 6V,
Current Sense Mode
l
±0.5 µA
Differential Input Current V
IN_ADC
= 0.17V, Current Sense Mode
l
80 250 nA
V
IN_ADC
= 6V, Voltage Sense Mode
l
10 15 µA
DAC Output Characteristics
N_V
DACP
Resolution 10 Bits
V
FS_VDACP
Full-Scale Output Voltage
(Programmable)
DAC Code = 0x3FF
DAC Polarity = 1
Buffer Gain Setting_0
Buffer Gain Setting_1
l
l
1.32
2.53
1.38
2.65
1.44
2.77
V
V
INL_V
DACP
Integral Nonlinearity (Note 5)
l
±2 LSB
DNL_V
DACP
Differential Nonlinearity (Note 5)
l
±2.4 LSB
V
OS_VDACP
Offset Voltage (Note 5)
l
±10 mV
V
DACP
Load Regulation (V
DACPn
– V
DACMn
) V
DACPn
= 2.65V, I
VDACPn
Sourcing = 2mA 100 ppm/mA
V
DACPn
= 0.1V, I
VDACPn
Sinking = 2mA 100 ppm/mA
PSRR (V
DACPn
– V
DACMn
) DC: 3.13V ≤ V
DD33
≤ 3.47V, V
PWR
= V
DD33
60 dB
100mV Step in 20ns with 50pF Load 40 dB
DC CMRR (V
DACPn
– V
DACMn
) –0.1V ≤ V
DACMn
≤ 0.1V 60 dB
Leakage Current V
DACPn
Hi-Z, 0V ≤ V
DACPn
≤ 6V
l
±100 nA
Short-Circuit Current Low V
DACPn
Shorted to GND
l
–10 –4 mA
Short-Circuit Current High V
DACPn
Shorted to V
DD33
l
4 10 mA
C
OUT
Output Capacitance V
DACPn
Hi-Z 10 pF
t
S_VDACP
DAC Output Update Rate Fast Servo Mode 250 µs
Voltage Supervisor Characteristics
V
IN_VS
Input Voltage Range (Programmable) V
IN_VS
= (V
SENSEPn
– V
SENSEMn
)
Low Resolution Mode
High Resolution Mode
l
l
0
0
6
3.8
V
V
Single-Ended V
oltage: V
SENSEMn
l
–0.1 0.1 V
N_VS Voltage Sensing Resolution 0V to 3.8V Range: High Resolution Mode 4 mV/LSB
0V to 6V Range: Low Resolution Mode 8 mV/LSB
TUE_VS Total Unadjusted Error 2V ≤ V
IN_VS
≤ 6V, Low Resolution Mode
l
±1.25 %
1.5V < V
IN_VS
≤ 3.8V, High Resolution
Mode
l
±1.0 %
0.8V ≤ V
IN_VS
≤ 1.5V, High Resolution
Mode
l
±1.5 %
t
S_VS
Update Rate 12.21 µs
V
IN_SNS
Input Characteristics
V
VIN_SNS
V
IN_SNS
Input Voltage Range
l
0 15 V
R
VIN_SNS
V
IN_SNS
Input Resistance
l
70 90 110 kΩ
TUE
VIN_SNS
VIN_ON, VIN_OFF Threshold Total
Unadjusted Error
3V ≤ V
VIN_SNS
≤ 8V
l
±2.0 %
V
VIN_SNS
> 8V
l
±1.0 %
READ_VIN Total Unadjusted Error 3V ≤ V
VIN_SNS
≤ 8V
l
±1.5 %
V
VIN_SNS
> 8V
l
±1.0 %