Datasheet

LTC2974
7
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
t
S_CS
Update Rate 12.21 µs
V
IN_SNS
Input Characteristics
V
IN_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 %
DAC Soft-Connect Comparator Characteristics
V
OS_CMP
Offset Voltage V
DACPn
= 0.2V
l
±1 ±18 mV
V
DACPn
= 1.3V
l
±2 ±26 mV
V
DACPn
= 2.65V
l
±3 ±52 mV
External Temperature Sensor Characteristics (READ_TEMPERATURE_1)
t
CONV_TSENSE
Conversion Time For One Channel, (Total Latency For All
Channels Is 4 • 66ms)
66 ms
I
TSENSE_HI
T
SENSE
High Level Current
l
–90 –64 –40 µA
I
TSENSE_LOW
T
SENSE
Low Level Current
l
–5.5 –4 –2.5 µA
TUE_TS Total Unadjusted Error Ideal Diode Assumed
l
±3 °C
N_TS Maximum Ideality Factor READ_TEMPERATURE_1 = 175°C
MFR_TEMP1_GAIN = 1/N_TS
1.10 NA
Internal T
emperature Sensor Characteristics (READ_TEMPERATURE_2)
TUE_TS2 T
otal Unadjusted Error ±1 °C
V
OUT
Enable Output (V
OUT_EN[3:0]
) Characteristics
V
VOUT_ENn
Output High Voltage I
VOUT_ENn
= –5µA, V
DD33
= 3.13V
l
10 13 14.7 V
I
VOUT_ENn
Output Sourcing Current V
VOUT_ENn
Pull-Up Enabled, V
VOUT_ENn
= 1V
l
–5 –7 –9 µA
Output Sinking Current Strong Pull-Down Enabled,
V
VOUT_ENn
= 0.4V
l
3 5 8 mA
Weak Pull-Down Enabled, V
VOUT_ENn
= 0.4V
l
33 50 65 µA
Output Leakage Current Internal Pull-Up Disabled,
0V ≤ V
VOUT_ENn
≤ 15V
l
±1 µA
General Purpose Output (AUXFAULTB) Characteristics
V
AUXFAULTB
Output High Voltage I
AUXFAULTB
= –5µA, V
DD33
= 3.13V
l
10 13 14.7 V
I
AUXFAULTB
Output Sourcing Current AUXFAULTB Pull-Up Enabled, V
AUXFAULTB
=
1V
l
–5 –7 –9 µA
Output Sinking Current Strong Pull-Down Enabled, V
AUXFAULTB
= 0.4V
l
3 5 8 mA
Output Leakage Current Internal Pull-Up Disabled, 0V ≤ V
AUXFAULTB
≤ 15V
l
±1 µA
EEPROM Characteristics
Endurance (Note 7) 0°C < T
J
< 85°C During EEPROM Write
Operations
l
10,000 Cycles
Retention (Note 7) T
J
< 85°C
l
10 Years
t
MASS_WRITE
Mass Write Operation Time (Note 8) STORE_USER_ALL, 0°C < T
J
< 85°C During
EEPROM Write Operations
l
440 4100 ms
elecTrical characTerisTics