LT1178/LT1179
W U U
APPLICATIO S I FOR ATIO
U
Please see the LT1078/LT1079 data sheet for applications
information.Allcommentsrelatingtospecifications,single
supply operation and phase reversal protection are
directly applicable to the LT1178/LT1179.
Micropower 100Hz to 1MHz V-to-F Converter
7V TO 10V
100k
1.5M
V
IN
0V TO 5V
10k
220k*
100Hz
TRIM
240k
TYPICAL
+
–
1N4148
100Ω
1µF
A2
1/2 LT1178
50k
1MHz
TRIM
+
+
LT1004–2.5
NC
1µF
12k
Q7
2N3904
+
47k
A1
Q8
2N3906
1/2 LT1178
V
DD
–
0.01µF
2k
CLK
RESET
CD4024
Q7
74C14
10M
V
SS
0.33µF
3pF
F
OUT
2µF
LTC201
+
V
IN1
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90µA
SUPPLY CURRENT IS 360µA AT 1MHz
DRIFT ≈ 50ppm/°C
*TRW MTR/5 + 120ppm/°C
500pF
POLYSTYRENE
S1
S3
IN3
IN4
D1
D2
D3
D4
S4
0.022µF
S2
–
V
IN2
GND
LT1178/LT1179 • AI01
W
W
1/2 LT1178
1/4 LT1179
SI PLIFIED SCHE ATIC
+
V
10k
10k
2.2k
5.6k
1.3k
6.4k
33k
11.5k
12.5k
Q54
1
Q53
2
1
Q6
Q16
Q14
Q24
Q15
Q32
Q5
Q52
Q47
Q37
Q46
–
Q29
Q3
Q30
3
C1
50pF
V
1
Q4
3k
Q40
Q25
8.6k
Q35
Q41
+
V
Q12
4
C4
4pF
Q26
2.9k
30Ω
Q11
Q44
C5
2.5pF
1
Q27
Q1
Q21
600Ω
600Ω
150k
OUT
IN
IN
–
+
Q31
J1
C3
40pF
Q28
Q36
Q18
Q33
Q2
Q22
Q48
+
V
Q19
Q42
Q49
Q50
Q39
Q23
Q9
Q10 Q17
+
9.1k
V
700k
Q7
Q8
Q45
Q51
Q55
C2
175pF
Q20
2A
10k
Q43
Q34
Q38
A
2A
3k
5.35k
6.2k
6.2k
30Ω
700k
–
V
11789fb
9
Linear Systems [ Linear Systems ]
