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LT1021 Datasheet(PDF) 12 Page - Linear Technology

Part # LT1021
Description  Precision Reference
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1021 Datasheet(HTML) 12 Page - Linear Technology

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LT1021
TYPICAL APPLICATIONS
Boosted Output Current
with No Current Limit
Boosted Output Current
with Current Limit
Ultraprecise Current Source
LT1021-10
OUT
IN
TRIM
GND
4.32k
VOUT = 10.24V
VIN
5k
V
– = –15V*
*MUST BE WELL REGULATED
dVOUT
dV
–
=
15mV
V
1021 TA12
Trimming 10V Units to 10.24V
CMOS DAC with Low Drift Full-Scale Trimming**
LT1021-10
TRIM
GND
OUT
LT1236 TA15
–
+
1.2k
R2
40.2
Ω
1%
R1
4.99k
1%
REF
CMOS
DAC
7520, ETC
IOUT
FB
30pF
LT1007C
R4*
100
Ω
FULL-SCALE
ADJUST
R3
4.02K
1%
10V
F.S.
–15V
TC LESS THAN 200ppm/
°C
NO ZERO ADJUST REQUIRED
WITH LT1007 (V0S ≤ 60µV)
*
**
LT1021-7
OUT
IN
2
*LOW TC
3
4
7
GND
–15V
15V
TRIM
100
Ω
15V
6
6.98k*
0.1%
17.4k
1%
1021 TA07
LT1001
IOUT = 1mA
REGULATION < 1ppm/V
COMPLIANCE = –13V TO 7V
LT1021
OUT
V+
≥ (VOUT + 1.8V)
GND
IN
1021 TA05
2N2905
10V AT
100mA
2
µF
SOLID
TANT
R1
220
Ω
+
LT1021
OUT
GND
IN
1021 TA06
2N2905
10V AT
100mA
2
µF
SOLID
TANT
D1*
LED
V +
≥ VOUT + 2.8V
8.2
Ω
R1
220
Ω
*GLOWS IN CURRENT LIMIT,
DO NOT OMIT
+
Operating 5V Reference from 5V Supply
2-Pole Lowpass Filtered Reference
LT1021-5
OUT
IN
GND
1021 TA16
1N914
1N914
≈8.5V
C2*
5
µF
C1*
5
µF
5V
REFERENCE
5V LOGIC
SUPPLY
CMOS LOGIC GATE**
fIN ≥ 2kHz*
FOR HIGHER FREQUENCIES C1 AND C2 MAY BE DECREASED
PARALLEL GATES FOR HIGHER REFERENCE CURRENT LOADING
*
**
+
LT1021
OUT
IN
GND
1021 TA13
–
+
R1
36k
1
µF
MYLAR
0.5
µF
MYLAR
R2
36k
LT1001
VIN
VIN
VREF
–VREF
f = 10Hz
TOTAL NOISE
≤2µVRMS
1Hz
≤ f ≤ 10kHz



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