Datasheet

LTC2978A
11
2978afa
For more information www.linear.com/LTC2978A
ADC Noise Histogram
Voltage Supervisor Total
Unadjusted Error vs Temperature
Input Sampling Current
vs Differential Input Voltage
DAC Full-Scale Output Voltage vs
Temperature
ADC Rejection vs Frequency
at V
IN
(Current Sense Mode, Zoom)
READ_V
OUT
(µV)
–20
0
NUMBER OF READINGS
200
400
600
800
1000
1200
–10 0 10 20
2978a G11
V
IN
= 0V
HIGH RESOLUTION MODE
TEMPERATURE (°C)
–50
ERROR (%)
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–0.35
–0.40
70
2978a G12
–20 10 40
100
55–35 –5 25 85
V
IN
= 0.8V
HIGH RESOLUTION MODE
INPUT VOLTAGE (V)
0
0
INPUT SAMPLING CURRENT (µA)
1
3
4
5
4
9
2978a G13
2
2
1
5
3 6
6
7
8
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
2.698
2.696
2.694
2.692
2.690
2.688
2.686
2.684
2.682
2.680
2.678
70
2978a G15
–20–35
10–5
40 55 85
25
100
FREQUENCY (Hz)
0
–120
REJECTION (dB)
–100
–80
–60
–40
–20
0
3125 6250 9375
12500
2978a G10
ADC High Resolution Mode
Differential Input Current
DIFFERENTIAL INPUT VOLTAGE (mV)
0
0
DIFFERENTIAL INPUT CURRENT (nA)
10
30
40
50
120 140 160
90
2978a G14
20
60
20
80
40
100
180
60
70
80
TYPICAL PERFORMANCE CHARACTERISTICS
DAC Offset Voltage vs
Temperature
DAC-INL
DAC-DNL
TEMPERATURE (°C)
–50
OFFSET ERROR (mV)
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
70
2978a G16
–20–35
10–5
40 55 85
25
100
DAC CODE
0
ERROR (LSBs)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
800
2978a G17
200
400
600
1000
DAC CODE
0
ERROR (LSBs)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
800
2978a G18
200
400
600
1000