Datasheet

LT1178/LT1179
9
11789fb
Micropower 100Hz to 1MHz V-to-F Converter
APPLICATIO S I FOR ATIO
WUUU
Please see the LT1078/LT1079 data sheet for applications
information. All comments relating to specifications, single
supply operation and phase reversal protection are
directly applicable to the LT1178/LT1179.
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90µA
SUPPLY CURRENT IS 360µA AT 1MHz
DRIFT ≈ 50ppm/°C
*TRW MTR/5 + 120ppm/°C
–
+
–
+
V
IN
0V TO 5V
50k
1MHz
TRIM
220k*
2k
2µF
0.33µF
47k
10M
F
OUT
V
DD
V
SS
12k
3pF
500pF
POLYSTYRENE
LTC201
74C14
NC
CLK
GND
10k
100k
7V TO 10V
LT1178/LT1179 • AI01
LT1004– 2.5
RESET
CD4024
A1
1/2 LT1178
A2
1/2 LT1178
Q7
1N4148
100Ω
Q8
2N3906
Q7
2N3904
1.5M
0.01µF
0.022µF
S1
D2
S2
D1
S3
IN1
V
+
V
–
IN4
IN3
IN2
D4
S4
D3
1µF1µF
100Hz
TRIM
240k
TYPICAL
+ +
1/2 LT1178
1/4 LT1179
SI PLIFIED SCHE ATIC
WW
10k
Q5
Q6 Q16 Q14 Q15 Q32
Q37
Q29
Q24
Q27
Q28
Q39
V
+
V
+
V
+
V
+
Q44
Q40
Q41
Q52
Q46
Q47
Q53
Q35
33k
150k
2
1
1
12.5k11.5k
V
–
V
–
Q4
C1
50pF
C5
2.5pF
C4
4pF
C2
175pF
C3
40pF
Q3
Q12
Q1
Q2
Q22
Q7 Q8
Q10 Q17
Q18
Q19
Q20
2A
3k
Q23
Q31
Q36
Q33
10k
30Ω
Q38
2A
Q45
Q55
Q51
Q43
5.35k
A
9.1k
700k
700k
Q49
Q48
Q42
J1
Q50
OUT
30Ω
6.2k 6.2k
Q21
600Ω
IN
IN
–
+
600Ω
4
1
1
3
3k
2.9k
Q26
Q25
10k 2.2k
8.6k
5.6k 1.3k 6.4k
Q11
Q9
Q54
Q34
Q30