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PDF LT1011 Data sheet ( Hoja de datos )
| Número de pieza | LT1011 | |
| Descripción | Voltage Comparator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1011 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s Pin Compatible with LM111 Series Devices
s Guaranteed Max 0.5mV Input Offset Voltage
s Guaranteed Max 25nA Input Bias Current
s Guaranteed Max 3nA Input Offset Current
s Guaranteed Max 250ns Response Time
s Guaranteed Min 200,000 Voltage Gain
s 50mA Output Current Source or Sink
s ±30V Differential Input Voltage
s Fully Specified for Single 5V Operation
U
APPLICATIO S
s SAR A/D Converters
s Voltage-to-Frequency Converters
s Precision RC Oscillator
s Peak Detector
s Motor Speed Control
s Pulse Generator
s Relay/Lamp Driver
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1011/LT1011A
Voltage Comparator
DESCRIPTIO
The LT®1011 is a general purpose comparator with sig-
nificantly better input characteristics than the LM111.
Although pin compatible with the LM111, it offers four
times lower bias current, six times lower offset voltage and
five times higher voltage gain. Offset voltage drift, a
previously unspecified parameter, is guaranteed at
15µV/°C. Additionally, the supply current is lower by a
factor of two with no loss in speed. The LT1011 is several
times faster than the LM111 when subjected to large
overdrive conditions. It is also fully specified for DC
parameters and response time when operating on a single
5V supply. These parametric improvements allow the
LT1011 to be used in high accuracy (≥12-bit) systems
without trimming. In a 12-bit A/D application, for instance,
using a 2mA DAC, the offset error introduced by the
LT1011 is less than 0.5LSB. The LT1011 retains all the
versatile features of the LM111, including single 3V to
±18V supply operation, and a floating transistor output
with 50mA source/sink capability. It can drive loads refer-
enced to ground, negative supply or positive supply, and
is specified up to 50V between V– and the collector output.
A differential input voltage up to the full supply voltage is
allowed, even with ±18V supplies, enabling the inputs to
be clamped to the supplies with simple diode clamps.
TYPICAL APPLICATIO
10µs 12-Bit A/D Converter
R1
1k
FULL-SCALE
TRIM
LM329
7V
3.9k
R2* R3
15V
6.49k
6.98k
0.001µF
20 14
15
16
15V
–15V
17
19
*R2 AND R4
SHOULD TC TRACK
INPUT
0V TO 10V
5V
6012
12-BIT
13 D/A CONVERTER 18
PARALLEL
OUTPUTS
12 11 10 9 8 7 6 5 4 3 2 1
PARALLEL
OUTPUTS
R4*
2.49k
R6
820Ω
2+
LT1011A
3–
R5
1k
7
24
5V
4 5 6 7 8 9 16 17 18 19 20 21
AM2504
SAR REGISTER
ES
D
CC
CP S
SERIAL OUTPUT
7475
LATCH
12
START
CLOCK f = 1.4MHz
1011 TA01
Response Time vs Overdrive
500
450
400
350
300
250
200
150
100
50
0
0.1
FALLING
OUTPUT
RISING
OUTPUT
1 10
OVERDRIVE (mV)
100
1011 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1011/LT1011A
Response Time Using GND Pin
as Output
15
10
5
0
–5
–10
–15
0
– 50
–100
20mV
0
5mV 2mV
V+
VIN
VOUT
2k
V–
12
TIME (µs)
VS = ±15V
TA = 25°C
34
1011 G10
Supply Current vs Supply Voltage
5
4
POSITIVE SUPPLY
COLLECTOR OUTPUT “LO”
3
2 POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT “HI”
1
0
0 5 10 15 20 25 30
SUPPLY VOLTAGE (V)
1011 G13
Output Saturation—
Ground Output
5 REFERRED TO V +
+2
8
V+
4
LT1011
7
3 1 RL
3
TJ = – 55°C
4
V–
VOUT
2 TJ = 25°C
TJ = 125°C
1
Response Time Using GND Pin
as Output
15
10
5
0
–5
–10
–15
0
– 50
–100
V+
VIN
V–
20mV 5mV 2mV
VOUT
2k
VS = ±15V
TA = 25°C
0 1 234
TIME (µs)
1011 G11
Supply Current vs Temperature
6
5
4 POSITIVE SUPPLY
COLLECTOR OUTPUT “LO”
3
Output Limiting Characteristics*
140
TA = 25°C
120
100
POWER
DISSIPATION
0.7
0.6
0.5
80 0.4
60 SHORT-CIRCUIT 0.3
CURRENT
40 0.2
20 0.1
*MEASURED 3 MINUTES
AFTER SHORT
00
0 5 10 15
OUTPUT VOLTAGE (V)
1011 G12
Output Leakage Current
10–7
VS = ±15V
10–8
10–9
VOUT = 35V
VGND = –15V
2
1 POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT “HI”
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (˚C)
1011 G14
10–10
10–11
25
45 65 85 105
TEMPERATURE (°C)
125
1011 G15
Output Saturation Voltage
0.6
ISINK = 8mA
0.5
TJ = 125°C
0.4
0.3 TJ = 25°C
0.2 TJ = – 55°C
0.1
Response Time vs Input Step Size
1000
800
600
400
VS = ± 15V
RL = 500Ω TO 5V
OVERDRIVE = 5mV
3–
INPUT
2+
1
5V
500Ω
7
RISING INPUT
FALLING INPUT
200
0
0 10 20 30 40 50
OUTPUT CURRENT (mA)
1011 G16
0
0 1234 56 78
INPUT OVERDRIVE (mV)
1011 G17
0
0 1 2 3 4 5 6 7 8 9 10
INPUT STEP (V)
1011 G18
5
5 Page 
TYPICAL APPLICATIONS
Combining Offset Adjust and Strobe
V+
10k
20k
5
–
LT1011
+
6
TTL OR CMOS
5V
1k
1011 TA13
LT1011/LT1011A
Combining Offset Adjustment and Hystersis
5k
2RH**
RH*
6 20k
–
5
LT1011
+
1
7
V+
*HYSTERESIS IS ≈ 0.45mV/µA OF
CURRENT CHANGE IN RH
RL
**THIS RESISTOR CAUSES HYSTERESIS
TO BE CENTERED AROUND VOS
1011 TA15
Direct Strobe Drive When CMOS* Logic
Uses Same V+ Supply as LT1011
V+
8
–
LT1011
+
6
1011 TA14
*NOT APPLICABLE FOR TTL LOGIC
Positive Peak Detector
15V
INPUT
2k 3
8
LT1011
2
7
1
2+
4
1M** +
LT1008
10k 3 –
8
C1* 100pF
6
2µF
1011 TA17
–15V
*MYLAR
**SELECT FOR REQUIRED RESET TIME CONSTANT
OUTPUT
Low Drift R/C Oscillator†
** 15V
15V
C1
0.015µF
2+ 8
LT1011
3–
1
7
4
1k
74HC04
×6
BUFFERED
OUTPUT
10k*
10k*
*1% METAL FILM
**TRW TYPE MTR-5/120ppm/°C, 25k ≤ RS ≤ 200k
C1: 0.015µF = POLYSTYRENE, –120ppm/°C,
± 30ppm WESCO TYPE 32-P
10k*
1011 TA16
NOTE: COMPARATOR CONTRIBUTES ≤10ppm/°C DRIFT
FOR FREQUENCIES BELOW 10kHz
†LOW DRIFT AND ACCURATE FREQUENCY ARE
OBTAINED BECAUSE THIS CONFIGURATION
REJECTS EFFECTS DUE TO INPUT OFFSET
VOLTAGE AND BIAS CURRENT OF THE
COMPARATOR
15V
Negative Peak Detector
15V
1M**
INPUT
2k
3– 8
LT1011
7
2+ 1 +
4
C1*
2µF
2–
LT1008
10k 3 +
8
100pF
6
1011 TA18
OUTPUT
–15V
*MYLAR
**SELECT FOR REQUIRED RESET TIME CONSTANT
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1011.PDF ] | |
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