LTC2978
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
and REF pins floating, unless
otherwise indicated. C
VDD33
= 100nF C
VDD25
= 100nF and C
REF
= 100nF
,
.
SYMBOL
t
CONV_ADC
PARAMETER
Conversion Time
CONDITIONS
Voltage Sense Mode (Note 6)
Current Sense Mode (Note 6)
Temperature Input (Note 6)
C
IN_ADC
f
IN_ADC
I
IN_ADC
Input Sampling Capacitance
Input Sampling Frequency
Input Leakage Current
Differential Input Current
Voltage Buffered IDAC Output Characteristics
N_V
DACP
V
FS_VDACP
INL_V
DACP
DNL_V
DACP
V
OS_VDACP
V
DACP
Resolution
Full-Scale Output Voltage
(Programmable)
Integral Nonlinearity
Differential Nonlinearity
Offset Voltage
Load Regulation (V
DACPn
– V
DACMn
)
PSRR (V
DACPn
– V
DACMn
)
DC CMRR (V
DACPn
– V
DACMn
)
Leakage Current
Short-Circuit Current Low
Short-Circuit Current High
C
OUT
t
S_VDACP
V
IN_VS
Output Capacitance
DAC Output Update Rate
Input Voltage Range (Programmable)
DAC Code = 0x3FF Buffer Gain Setting_0
DAC Polarity = 1
Buffer Gain Setting_1
(Note 7)
(Note 7)
(Note 7)
V
DACPn
= 2.65V, I
VDACPn
Sourcing = 2mA
V
DACPn
= 0.1V, I
VDACPn
Sinking = 2mA
DC: 3.13V ≤ V
DD33
≤ 3.47V, V
PWR
= V
DD33
100mV Step in 20ns with 50pF Load
–0.1V ≤ V
DACMn
≤ 0.1V
V
DACPn
Hi-Z, 0V ≤ V
DACPn
≤ 6V
V
DACPn
Shorted to GND
V
DACPn
Shorted to V
DD33
V
DACPn
Hi-Z
Fast Servo Mode
V
IN_VS
= (V
SENSEPn
Low Resolution Mode
– V
SENSEMn
)
High Resolution Mode
Single-Ended Voltage: V
SENSEMn
N_VS
TUE_VS
Voltage Sensing Resolution
Total Unadjusted Error
0V to 3.8V Range: High Resolution Mode
0V to 6V Range: Low Resolution Mode
2V ≤ V
IN_VS
≤ 6V, Low Resolution Mode
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
6.15
24.6
24.6
1
62.5
MAX
UNITS
ms
ms
ms
pF
kHz
V
IN_ADC
= 0V, 0V ≤ V
COMMONMODE
≤ 6V,
Current Sense Mode
V
IN_ADC
= 0.17V, Current Sense Mode
V
IN_ADC
= 6V, Voltage Sense Mode
l
l
l
±0.5
80
10
10
1.32
2.53
1.38
2.65
1.44
2.77
±2
±2.4
±10
100
100
60
40
60
±100
–10
4
10
250
0
0
–0.1
4
8
±1.25
±1.0
±1.5
12.21
6
3.8
0.1
–4
10
250
15
µA
nA
µA
Bits
V
V
LSB
LSB
mV
ppm/mA
ppm/mA
dB
dB
dB
nA
mA
mA
pF
µs
V
V
V
mV/LSB
mV/LSB
%
%
%
µs
Voltage Supervisor Characteristics
1.5V < V
IN_VS
≤ 3.8V, High Resolution Mode
l
0.8V ≤ V
IN_VS
≤ 1.5V, High Resolution Mode
l
t
S_VS
V
VIN_SNS
R
VIN_SNS
Update Rate
V
IN_SNS
Input Voltage Range
V
IN_SNS
Input Resistance
l
l
V
IN_SNS
Input Characteristics
0
70
90
15
110
V
kΩ
2978fc
6
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
