Datasheet

12
LT1792
 LINEAR TECHNOLOGY CORPORATION 1999
1792f LTTP 0599 4K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear-tech.com
U
SA
O
PP
L
IC
AT
ITY
P
I
CA
L
Light Balance Detection Circuit Unity-Gain Buffer with Extended
Load Capacitance Drive Capability
1792 TA07
V
OUT
= 1M × (I
1
– I
2
)
PD1
,
PD2 = HAMAMATSU S1336-5BK
WHEN EQUAL LIGHT ENTERS PHOTODIODES, V
OUT
< 3mV.
–
+
LT1792
R1
1M
C1
2pF TO 8pF
PD1
PD2
I
1
I
2
V
OUT
1792 TA08
V
OUT
–
+
LT1792
C1
V
IN
R2
1k
C
L
R1
33Ω
C1 = C
L
≤ 0.1µF
OUTPUT SHORT-CIRCUIT CURRENT
(∼ 30mA) WILL LIMIT THE RATE AT WHICH THE
VOLTAGE CAN CHANGE ACROSS LARGE CAPACITORS
I = C
()
dV
dt
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1113 Low Noise Dual JFET Op Amp Dual Version of LT1792, V
NOISE
= 4.5nV/√Hz
LT1169 Low Noise Dual JFET Op Amp Dual Version of LT1793, I
B
= 10pA, V
NOISE
= 6nV/√Hz
LT1793 Low Noise Single Op Amp Lower I
B
Version of LT1792, I
B
= 10pA, V
NOISE
= 6nV/√Hz
Dimensions in inches (millimeters) unless otherwise noted.
U
PACKAGE
D
E
SC
R
I
PTI
O
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
1
2
3
4
0.150 – 0.157**
(3.810 – 3.988)
8
7
6
5
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.010 – 0.020
(0.254 – 0.508)
× 45°
0°– 8° TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 0996
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
DIMENSION DOES NOT INCLUDE MOLD FLASH.
MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH.
INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
N8 1197
0.100 ± 0.010
(2.540 ± 0.254)
0.065
(1.651)
TYP
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN
12
3
4
876
5
0.255 ± 0.015*
(6.477 ± 0.381)
0.400*
(10.160)
MAX
0.009 – 0.015
(0.229 – 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.325
+0.035
–0.015
+0.889
–0.381
8.255
()
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)