LT1228
22
1228fd
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2012
LT 0612 REV D PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIONS
RF AGC Amplifier (Leveling Loop)
+
–
A3
LT1006
LT1228 TA20
+
–
CFA
100
10k
RF INPUT
0.6VRMS to 1.3VRMS
25MHz
300
–15V
15V
+
–
gm
470
10
0.01F
10k
0.01F
15V
–15V
4pF
10k
100k
AMPLITUDE
ADJUST
10k
4.7k
–15V
LT1004
1.2V
10k
OUTPUT
2VP–P
1N4148’s
COUPLE THERMALLY
3
2
7
5
1
8
4
Inverting Amplifier with DC Output Less Than 5mV
Amplitude Modulator
LT1228 TA21
–
+
100F
–
+
R5
V–
gm
3
2
V+
7
5
4
1
8
6
VO
CFA
RF
1k
RG
1k
VS = ±5V, R5 = 3.6k
VS = ±15V, R5 = 13.6k
VOUT MUST BE LESS THAN
200mVP–P FOR LOW OUTPUT OFFSET
BW = 30Hz TO 20MHz
VIN
INCLUDES DC
LT1228 TA22
–
+
1k
–
+
10k
–5V
gm
3
5V
7
5
4
1
8
6
VOUT
0dBm(230mV) AT
MODULATION = 0V
CFA
RF
750
RG
750
+
4.7F
MODULATION
INPUT ≤ 8VP–P
4.7F
CARRIER
INPUT
30mV
2
PART NUMBER
DESCRIPTION
COMMENTS
LT1227
140MHz Current Feedback Amplifier
1100V/s Slew Rate, 0.01% Differential Gain, 0.03% Differential Phase
LT1251/LT1256
40MHz Video Fader
Accurate Linear Gain Control: ±1% Typ, ±3% Max
LT1399
400MHz Current Feedback Amplifier
800V/s Slew Rate, 80mA Output Current