LT1990 Linear Technology, LT1990 Datasheet - Page 16

• Manufacturer Part Number: LT1990
• Description: Difference Amplifier
• Manufacturer: Linear Technology

RELATED PARTS
LT1990
TYPICAL APPLICATIO
PART NUMBER
LT1787
LT1789
LTC1921
LT1991
LT1995
LT6910
16
V
OUT
–77V ≤ V
= V
LOAD
Bidirectional Controlled Current Source
REF
– (10 • I
Telecom Supply Current Monitor
CM
R
V
S
OUTPUT IS 1mA PER 100mV INPUT
I
≤ 8V
CTL
L
EXAMPLE: FOR R
DESCRIPTION
Precision High Side Current Sense Amplifier
Micropower Instrumentation Amplifier
Dual –48V Supply and Fuse Monitor
High Accuracy Difference Amplifier
30MHz, 1000V/µs Gain Selectable Amplifier
Single Supply Programmable Gain Amplifier
L
I
LOAD =
• R
+
–
3
2
REF
48V
S
)
+
–
V
IN
LT1990
1
CTL
4
LT6650
+V
GND
–V
/R
7
3
2
REF
4
SENSE
2
SENSE
+
–
OUT
FB
LT1990
1
5
≤ 5mA
=100Ω,
5V
6
U
1
7
4
R
G2
G1
SENSE
174k
I
LOAD
1990 AI03
5
8
20k
6
V
REF
1µF
= 4V
1nF
V
OUT
1990 AI01
COMMENTS
On-Chip Precision Resistor Array
Micropower, Precision, G = 1 to 1000
Withstands ±200V Transients
Micropower, Precision, Pin Selectable G = –13 to 14
Pin Selectable G = –7 to 8
Digitally Controlled, SOT-23, G = 0 to 100
Boosted Bidirectional Controlled Current Source
(HI = 10X, LO = 1X)
V
CTL
GAIN_SEL
3
2
REF
+
–
V
Selectable Gain Amplifier
V
V
LT1990
OUTPUT IS 1mA PER 10mV INPUT
REF
1
IN
IN
I
EXAMPLE: FOR R
+
–
+V
LOAD =
–V
7
3
2
1k
4
REF
1k
+
–
V
CTL
LT1990
1
6
+V
CZT751
CZT651
/R
–V
+
© LINEAR TECHNOLOGY CORPORATION 2004
7
SENSE
4
G2
G1
SENSE
10µF
5
8
≤ 100mA
6
=10Ω,
LT/TP 0704 1K • PRINTED IN USA
2N7002
1990 AI02
V
OUT
1990 AI04
R
2N7002
SENSE
I
LOAD
1990f