Datasheet

LT2178/LT2179
8
21789fc
TYPICAL PERFORMANCE CHARACTERISTICS
OPERATING FREQUENCY (Hz)
0.1
PSRR (dB)
120
100
80
60
40
20
0
1
10 100 1k
21789 G19
10k 100k
T
A
= 25°C
V
S
= p2.5V + 1V
P-P
SINE WAVE
NEGATIVE
SUPPLY
POSITIVE
SUPPLY
FREQUENCY (Hz)
10
1
OUTPUT IMPEDANCE ()
10
100
10k
100
1k
21789 G20
1k
10k
100k
A
CL
= 100
A
CL
= 10
A
CL
= 1
T
A
= 25°C
V
S
= 5V, 0V
I
L
= 0
Power Supply Rejection Ratio
vs Frequency Closed Loop Output Impedance
SIMPLIFIED SCHEMATIC
1/2 LT2178
1/4 LT2179
10k 10k 2.2k 5.6k
Q5
Q6
Q11
600
600
Q1
Q21
Q2
Q22
Q9
C2
175pF
6.2k
Q7
Q28
4
1
Q12
Q3
Q16 Q14
Q29
Q4
Q24
8.6k
C1
50pF
C5
2.5pF
Q27
V
+
Q10
Q17
Q8
6.2k
Q19
Q18
Q15 Q32
1.3k
6.4k
Q37
Q30
1
3
Q25
C4
4pF
2.9k
3k
Q31
C3
40pF
Q23
Q20
2A
3k
30
Q34
Q36
OUT
Q26
30
Q35
33k
Q54
1
1
2
150k
Q33
10k
V
+
Q38
5.35k
Q45
Q55
Q51
Q42
Q44
V
+
V
–
Q46
Q47
11.5k
V
+
12.5k
Q40
Q41
Q48
9.1k
Q43
V
–
700k
700k
21789 SS
IN
–
IN
+
Q50
Q49
J1
Q39
2A
Q53
Q52