LT1128 Linear Technology Corporation, LT1128 Datasheet - Page 15

• Manufacturer Part Number: LT1128
• Description: Ultra Low Noise Precision High Speed Op Amps
• Manufacturer: Linear Technology Corporation

+INPUT
–INPUT
GAIN = 1000, BANDWIDTH = 1MHz
INPUT REFERRED NOISE = 1.5nV/ Hz AT 1kHz
WIDEBAND NOISE –DC to 1MHz = 3 V
IF BW LIMITED TO DC TO 100kHz = 0.55 V
TYPICAL APPLICATIO S
1. ASSUME VOLTAGE NOISE OF LT1028 AND 7.5 SOURCE RESISTOR = 0.9nV/ Hz.
2. GAIN WITH n LT1028s IN PARALLEL = n 200.
3. OUTPUT NOISE = n 200 0.9nV/ Hz.
4. INPUT REFERRED NOISE =
5. NOISE CURRENT AT INPUT INCREASES n TIMES.
6. IF n = 5, GAIN = 1000, BANDWIDTH = 1MHz, RMS NOISE, DC TO 1MHz =
Low Noise, Wide Bandwidth Instrumentation Amplifier
Paralleling Amplifiers to Reduce Voltage Noise
+
–
+
–
7.5
7.5
7.5
LT1028
LT1028
820
820
–
+
–
+
+
–
LT1028
LT1028
LT1028
A1
A2
An
OUTPUT NOISE
470
10
470
470
50
n 200
RMS
RMS
68pF
68pF
300
300
=
1.5k
1.5k
1.5k
0.9
n
U
nV/ Hz.
10k
–
+
LT1028
10k
–
+
LT1028
4.7k
2 V
5
= 0.9 V.
1028/1128 TA08
OUTPUT
1028/1128 TA03
DRIVE
OUTPUT
SINE
NORTHROP CORP.
GYRO TYPICAL–
GR-F5AH7-5B
•
100pF
10
TAPE HEAD
ALL RESISTORS METAL FILM
47k
MAG PHONO
10
INPUT
Gyro Pick-Off Amplifier
INPUT
2
3
Tape Head Amplifier
–
+
Phono Preamplifier
2
3
LT1028
–
+
499
–15V
15V
LT1028
787
4
7
31.6k
+
–
ALL RESISTORS METAL FILM
LT1028
0.1 F
LT1028/LT1128
6
6
0.1 F
0.33 F
1028/1128 TA07
OUTPUT
100
1k
10k
1028/1128 TA06
OUTPUT TO SYNC
DEMODULATOR
OUTPUT
15
1028/1128 TA09