Datasheet
LT1990
16
1990fb
© LINEAR TECHNOLOGY CORPORATION 2004
LT 0406 REV B • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIO
U
PART NUMBER DESCRIPTION COMMENTS
LT1787 Precision High Side Current Sense Amplifier On-Chip Precision Resistor Array
LT1789 Micropower Instrumentation Amplifier Micropower, Precision, G = 1 to 1000
LTC1921 Dual –48V Supply and Fuse Monitor Withstands ±200V Transients
LT1991 High Accuracy Difference Amplifier Micropower, Precision, Pin Selectable G = –13 to 14
LT1995 30MHz, 1000V/µs Gain Selectable Amplifier Pin Selectable G = –7 to 8
LT6910 Single Supply Programmable Gain Amplifier Digitally Controlled, SOT-23, G = 0 to 100
Telecom Supply Current Monitor Selectable Gain Amplifier
Bidirectional Controlled Current Source
Boosted Bidirectional Controlled Current Source
–
+
LT6650
GND
IN OUT
FB
174k
20k
1nF
1µF
V
REF
= 4V
1
2
3
2
6
5
7
4
1
8
4
5
LOAD
R
S
48V
I
L
+
–
5V
V
OUT
1990 AI01
–77V ≤ V
CM
≤ 8V
V
OUT
= V
REF
– (10 • I
L
• R
S
)
LT1990
REF
G1
G2
–
+
3
2
6
7
4
8
5
1
+V
–V
LT1990
V
OUT
V
IN
+
V
IN
–
1990 AI02
REF
2N7002
2N7002
GAIN_SEL
(HI = 10X, LO = 1X)
G1
G2
–
+
3
2
6
7
4
1
+V
–V
LT1990
I
LOAD
I
LOAD =
V
CTL
/R
SENSE
≤ 5mA
EXAMPLE: FOR R
SENSE
=100Ω,
OUTPUT IS 1mA PER 100mV INPUT
V
CTL
R
SENSE
1990 AI03
REF
–
+
3
2
6
7
4
1
+V
–V
LT1990
I
LOAD
I
LOAD =
V
CTL
/R
SENSE
≤ 100mA
EXAMPLE: FOR R
SENSE
=10Ω,
OUTPUT IS 1mA PER 10mV INPUT
V
CTL
R
SENSE
1990 AI04
10µF
1k
1k
REF
CZT751
CZT651
+
PACKAGE DESCRIPTIO
U
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)
× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1
2
3
4
.150 – .157
(3.810 – 3.988)
NOTE 3
8
7
6
5
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN
.160
±
.005
RECOMMENDED SOLDER PAD LAYOUT
.045
±
.005
.050 BSC
.030
±
.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)