Datasheet

LT1790
12
1790fc
For more information www.linear.com/LT1790
1.25V TYPICAL PERFORMANCE CHARACTERISTICS
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
1.255
1.265
1.275
1.285
16
17901.25. G07
1.245
1.235
1.250
1.260
1.270
1.280
1.240
1.230
1.225
4
8
12
2 18
6
10
14
20
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
FREQUENCY (Hz)
–60
POWER SUPPLY REJECTION RATIO (dB)
0
10
–70
–80
–10
–40
–20
–30
–50
100 10k 100k 1M
17901.25 G08
–90
1k
V
IN
= 3V
C
L
= 1µF
FREQUENCY (Hz)
1
OUTPUT IMPEDANCE (Ω)
10
100
100 10k 100k
17901.25 G09
0
1k
500
V
IN
= 3V
C
L
= 0.47µF
C
L
= 4.7µF
C
L
= 1µF
OUTPUT TO GROUND VOLTAGE (V)
0
CURRENT IN R
L
(mA)
0.10
0.20
0.30
0.05
0.15
0.25
–2.0 –1.5 –1.0 –0.5
17091.25 G10
0–2.5
–V
EE
V
OUT
3V
R
L
5k
4
21
6
1µF
LT1790-1.25
R1 10k
T
A
= 25°C
T
A
= 125°C
T
A
= –55°C
HOURS
0
ppm
60
100
140
800
17901.25 G11
20
–20
40
80
120
0
–40
–60
200
400
600
1000
LT1790S6-1.25V
2 TYPICAL PARTS SOLDERED TO PCB
T
A
= 30°C
TIME (SEC)
0
OUTPUT NOISE (5µV/DIV)
8
17901.25 G12
2 4 6 1071 3 5 9
FREQUENCY (Hz)
10
2.0
NOISE VOLTAGE (µV/√Hz)
2.5
3.0
3.5
4.0
100 1k 10k
17901.25 G13
1.5
1.0
0.5
0
4.5
5.0
C
L
= 1µF
I
O
= 100µA
I
O
= 0µA
I
O
= 250µA
I
O
= 1mA
FREQUENCY (Hz)
1
INTEGRATED NOISE (µV
RMS
)
10
100
10010 1000
17901.25 G14
Line Regulation Output Impedance vs Frequency
Power Supply Rejection Ratio
vs Frequency
–1.25V Characteristics
Long-Term Drift
(Data Points Reduced After 500 Hr) Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum Integrated Noise 10Hz to 1kHz
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
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