Datasheet

LTC2974
6
2974fc
For more information www.linear.com/LTC2974
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
f
IN_ADC
Input Sampling Frequency 62.5 kHz
I
IN_ADC
Input Leakage Current I
SENSEPn
, I
SENSEMn
,V
SENSEPn
, and V
SENSEMn
Inputs, V
IN_ADC
= 0V, 0V ≤ V
COMMONMODE
≤ 6V
l
±0.5 µA
Differential Input Current V
SENSEPn
, and V
SENSEMn
Inputs, V
IN_ADC
= 6V
l
10 15 µA
I
SENSEPn
, and I
SENSEMn
Inputs,
V
IN_ADC
= 0.17V
l
0.3 0.5 µA
DAC Output Characteristics
N_V
DAC
Resolution 10 Bits
V
FS_VDAC
Full-Scale Output Voltage
(Programmable)
DAC Code = 0x3FF
DAC Polarity = 1
Buffer Gain Setting_0
Buffer Gain Setting_1
l
l
1.3
2.5
1.38
2.65
1.44
2.77
V
V
INL_V
DAC
Integral Nonlinearity (Note 6)
l
±2 LSB
DNL_V
DAC
Differential Nonlinearity (Note 6)
l
±2.4 LSB
V
OS_VDAC
Offset Voltage (Note 6)
l
±12 mV
V
DAC
Load Regulation V
DACn
= 2.65V, I
VDACn
Sourcing = 2mA 100 ppm/mA
V
DACn
= 0.1V, I
VDACn
Sinking = 2mA 100 ppm/mA
PSRR DC: 3.13V ≤ V
DD33
≤ 3.47V, V
PWR
= V
DD33
60 dB
Leakage Current V
DACn
Hi-Z, 0V ≤ V
DACn
≤ 6V
l
±100 nA
Short-Circuit Current Low V
DACn
Shorted to GND
l
–12 –4 mA
Short-Circuit Current High V
DACn
Shorted to V
DD33
l
4 12 mA
C
OUT
Output Capacitance V
DACn
Hi-Z 10 pF
t
S_VDAC
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 Voltage: 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
Current Supervisor Characteristics
V
IN_CS
Current Sense Input Range Single-Ended Voltage: I
SENSEPn
, I
SENSEMn
l
–0.1 6 V
Differential Voltage:
V
IN_CS
= (I
SENSEPn
– I
SENSEMn
)
l
–170 170 mV
N_CS Current Sense Resolution IOUT_OC_FAULT_LIMIT • IOUT_CAL_GAIN
IOUT_UC_FAULT_LIMIT • IOUT_CAL_GAIN
400 µV/LSB
TUE_CS T
otal Unadjusted Error 50mV ≤ V
IN_CS
≤ 170mV
l
±3 %
V
IN_CS
< 50mV
l
±1.5 mV
V
OS_CS
Offset Error |V
IN_CS
| = 0.8mV
l
600 µV
I
OS_CS
Differential Input Offset Current OC = Positive Full-Scale, UC = 0A,
VIN_CS = 0V
117 nA
OC = UC = Positive Full-Scale, VIN_CS = 0V 244 nA
OC = 0A, UC < 0A, VIN_CS = 0V 0 nA
elecTrical characTerisTics