Datasheet

LT6656
7
6656fa
Output Impedance vs Frequency
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
6656 G21
10k
1k
100
10
1
10 1k 10k100
V
IN
= V
OUT
+ 0.5V
C
L
= 1µF
I
L
= 0
1.25V OPTION
2.5V OPTION
5V OPTION
Typical perForMance characTerisTics
Reverse Output Current
Reverse Input Current
0 15 20105
100
10
1
OUTPUT VOLTAGE (V)
REVERSE OUTPUT CURRENT (µA)
6656 G12
T
A
= 125°C
T
A
= 85°C
T
A
= 25°C
T
A
= –55°C
ALL OPTIONS
V
IN
= GND
INPUT VOLTAGE (V)
REVERSE INPUT CURRENT (µA)
6656 G11
1000
100
10
1
0
0 –2 –4 –6 –8 –20–18–16–14–12–10
T
A
= 125°C
T
A
= 85°C
T
A
= 25°C
T
A
= –55°C
ALL OPTIONS
V
OUT
= GND
Output Noise Voltage Spectrum
vs Load Capacitance
FREQUENCY (Hz)
NOISE VOLTAGE (µV/√Hz)
6656 G15
40
35
30
25
20
15
10
5
0
1 100 1k10
2.5V OPTION
V
IN
= 3V
I
L
= 0
C
L
= 47µF
C
L
= 4.7µF
C
L
= 0.47µF
Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum
vs Load Current
OUTPUT NOISE (20ppm/DIV)
TIME (1s/DIV)
6656 G13
ALL OPTIONS
V
IN
= V
OUT
+ 0.5V
C
L
= 1µF
I
L
= 0
FREQUENCY (Hz)
NOISE VOLTAGE (µV/√Hz)
6656 G14
16
14
12
10
8
6
4
2
0
10 1k 10k100
2.5V OPTION
V
IN
= 3V
C
L
= 1µF
I
L
= 0
I
L
= 10µA
I
L
= 250µA
I
L
= 1mA
Ground Current vs Load Current
LOAD CURRENT (A)
GROUND CURRENT (µA)
6656 G07
1000
100
10
1
10µ 1m 10m100µ
T
A
= 125°C
T
A
= 85°C
T
A
= 25°C
T
A
= –55°C
ALL OPTIONS
V
IN
= V
OUT
+ 0.5V
C
L
= 1µF
Output Impedance vs Frequency
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
6656 G22
10k
1k
100
10
1
10 1k 10k100
2.5V OPTION
V
IN
= 3V
I
L
= 0, C
L
= 1µF
I
L
= 0, C
L
= 10µF
I
L
= 100µA, C
L
= 1µF
I
L
= 100µA, C
L
= 10µF
Output Voltage Noise Spectrum
FREQUENCY (Hz)
NOISE VOLTAGE (µV
RMS
/√Hz)
6656 G24
30
25
20
15
10
5
0
10 1k 10k100
V
IN
= V
OUT
+ 5V
C
L
= 1µF
I
L
= 0
1.25V OPTION
2.5V OPTION
5V OPTION