LTC2978 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978' PDF : 64 Pages View PDF
LTC2978
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VPWR = VIN_SNS = 12V; VDD33, VDD25, REFP and REFM pins floating,
unless otherwise indicated. CVDD33 = 100nF, CVDD25 = 100nF and CREF = 100nF.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tCONV_ADC Conversion Time
Voltage Sense Mode (Note 6)
Current Sense Mode (Note 6)
6.15
ms
24.6
ms
Temperature Input (Note 6)
24.6
ms
CIN_ADC
fIN_ADC
IIN_ADC
Input Sampling Capacitance
Input Sampling Frequency
Input Leakage Current
VIN_ADC = 0V, 0V ≤ VCOMMONMODE ≤ 6V,
l
Current Sense Mode
1
pF
62.5
kHz
±0.5
µA
Differential Input Current
DAC Output Characteristics
VIN_ADC = 0.17V, Current Sense Mode
l
VIN_ADC = 6V, Voltage Sense Mode
l
80
250
nA
10
15
µA
N_VDACP
VFS_VDACP
Resolution
Full-Scale Output Voltage
(Programmable)
10
Bits
DAC Code = 0x3FF Buffer Gain Setting_0 l 1.32
1.38
1.44
V
DAC Polarity = 1 Buffer Gain Setting_1 l 2.53
2.65
2.77
V
INL_VDACP
DNL_VDACP
VOS_VDACP
VDACP
Integral Nonlinearity
Differential Nonlinearity
Offset Voltage
Load Regulation (VDACPn – VDACMn)
PSRR (VDACPn – VDACMn)
(Note 7)
l
(Note 7)
l
(Note 7)
l
VDACPn = 2.65V, IVDACPn Sourcing = 2mA
VDACPn = 0.1V, IVDACPn Sinking = 2mA
DC: 3.13V ≤ VDD33 ≤ 3.47V, VPWR = VDD33
100mV Step in 20ns with 50pF Load
±2
LSB
±2.4
LSB
±10
mV
100
ppm/mA
100
ppm/mA
60
dB
40
dB
DC CMRR (VDACPn – VDACMn)
Leakage Current
Short-Circuit Current Low
Short-Circuit Current High
COUT
Output Capacitance
tS_VDACP
DAC Output Update Rate
Voltage Supervisor Characteristics
–0.1V ≤ VDACMn ≤ 0.1V
VDACPn Hi-Z, 0V ≤ VDACPn ≤ 6V
VDACPn Shorted to GND
VDACPn Shorted to VDD33
VDACPn Hi-Z
Fast Servo Mode
60
dB
l
±100
nA
l –10
–4
mA
l
4
10
mA
10
pF
250
µs
VIN_VS
Input Voltage Range (Programmable) VIN_VS = (VSENSEPn Low Resolution Mode l
0
– VSENSEMn)
High Resolution Mode l
0
Single-Ended Voltage: VSENSEMn
l –0.1
N_VS
Voltage Sensing Resolution
0V to 3.8V Range: High Resolution Mode
4
6
V
3.8
V
0.1
V
mV/LSB
0V to 6V Range: Low Resolution Mode
8
mV/LSB
TUE_VS
Total Unadjusted Error
2V ≤ VIN_VS ≤ 6V, Low Resolution Mode l
1.5V < VIN_VS ≤ 3.8V, High Resolution
l
Mode
±1.25
%
±1.0
%
0.8V ≤ VIN_VS ≤ 1.5V, High Resolution
l
Mode
±1.5
%
tS_VS
Update Rate
VIN_SNS Input Characteristics
VVIN_SNS
VIN_SNS Input Voltage Range
RVIN_SNS
VIN_SNS Input Resistance
12.21
µs
l
0
15
V
l
70
90
110
kΩ
2978fd
6
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