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PDF LT1219LCN8 Data sheet ( Hoja de datos )
| Número de pieza | LT1219LCN8 | |
| Descripción | Precision Rail-to-Rail Input and Output Op Amps | |
| Fabricantes | Linear Technology | |
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LT1218/LT1219
Precision Rail-to-Rail Input
and Output Op Amps
FEATURES
s Rail-to-Rail Input and Output
s 90µV VOS(MAX) for VCM = V– to V+
s High Common Mode Rejection Ratio: 97dB Min
s C-LoadTM Stable Version (LT1219)
s High AVOL: 500V/mV Minimum Driving 10kΩ Load
s Wide Supply Range:
2V to ±15V (LT1218/LT1219)
2V to ±5V (LT1218L/LT1219L)
s Shutdown Mode: IS < 30µA
s Low Supply Current: 420µA Max
s Low Input Bias Current: 18nA Typical
s 300kHz Gain-Bandwidth Product (LT1218)
s Slew Rate: 0.10V/µs (LT1218)
U
APPLICATIONS
s Driving A/D Converters
s Test Equipment Amplifiers
s MUX Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
MUX Amplifier
5V
VIN1 +
LT1218L
VOUT
– SHDN
VIN2
INPUT
SELECT
5V
+
LT1218L
– SHDN
MAXIMUM IN
TO OUT ERROR
= 110µV FOR
0.05V ≤ VIN ≤ 4.8V
RL = 10k
74HCO4
1218/19 • TA01
DESCRIPTION
The LT®1218/LT1219 are bipolar op amps which combine
rail-to-rail input and output operation with precision speci-
fications. Unlike other rail-to-rail amplifiers, the LT1218/
LT1219’s input offset voltage is a low 90µV across the
entire rail-to-rail input range, not just a portion of it. Using
a patented technique, both input stages of the LT1218/
LT1219 are trimmed: one at the negative supply and the
other at the positive supply. The resulting common mode
rejection of 97dB minimum is much better than other rail-
to-rail input op amps. A minimum open-loop gain of
500V/mV into a 10k load virtually eliminates all gain error.
The LT1218 has conventional compensation which
assures stability for capacitive loads of 1000pF or less.
The LT1219 has compensation that requires the use of a
0.1µF output capacitor, which improves the amplifier’s
supply rejection and reduces output impedance at high
frequencies. The output capacitor’s filtering action also
reduces high frequency noise, which is beneficial when
driving A/D converters.
High and low voltage versions of the devices are offered.
Operation is specified for 3V, 5V and ±5V supplies for the
LT1218L/LT1219L and 3V, 5V and ±15V for the LT1218/
LT1219.
Voltage Follower Input to Output Error
10
VS = 5V
AV = 1
NO LOAD
1.0
MAX ERROR = 110µV
0.1 0.05V ≤ VIN ≤ 4.8V
0.01
01
0.05
23
INPUT VOLTAGE (V)
45
4.95
LT1218/19 • TA02
1
1 page  
LT1218/LT1219
ELECTRICAL CHARACTERISTICS
LT1218L/LT1219L only; 0°C ≤ TA ≤ 70°C, VS = ±5V, VCM = 0V, VO = 0V, VSHDN = 5V, unless otherwise noted.
SYMBOL PARAMETER
VOS Input Offset Voltage
∆VOS
IB
Input Offset Voltage Shift
Input Bias Current
∆IB Input Bias Current
IOS Input Offset Current
∆IOS Input Offset Current Shift
AVOL Large-Signal Voltage Gain
CMRR
VOL
Common Mode Rejection Ratio
Output Voltage Swing LOW
VOH Output Voltage Swing HIGH
ISC Short-Circuit Current
IS Supply Current
Positive Supply Current, SHDN
CONDITIONS
VCM = V +
VCM = V –
VCM = V – to V +
VCM = V +
VCM = V–
VCM = V – to V+
VCM = V +
VCM = V–
VCM = V – to V +
VO = – 4.7V to 4.7V, RL = 10k
VO = – 4.5V to 4.5V, RL = 2k
VCM = V– to V +
No Load
ISINK = 0.5mA
ISINK = 5mA
No Load
ISOURCE = 0.5mA
ISOURCE = 5mA
VSHDN = 0V
MIN TYP
q 100
q 100
q 30
q
q – 75
30
– 18
q 50
q5
q3
q5
q 375
q 275
2800
1300
q 100
110
q V – + 0.004
q V – + 0.045
q V – + 0.200
q V+ – 0.014 V+ – 0.004
q V+ – 0.150 V+ – 0.075
q V+ – 0.920 V+ – 0.450
q5
10
q 400
q 11
MAX
250
250
90
75
150
25
25
20
V – + 0.014
V – + 0.100
V – + 0.580
495
54
UNITS
µV
µV
µV
nA
nA
nA
nA
nA
nA
V/mV
V/mV
dB
V
V
V
V
V
V
mA
µA
µA
LT1218L, LT1219L only; – 40°C ≤ TA ≤ 85°C, VS = ±5V; VCM = 0V, VO = 0V, VSHDN = 5V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
VOS Input Offset Voltage
∆VOS
IB
Input Offset Voltage Shift
Input Bias Current
∆IB Input Bias Current
IOS Input Offset Current Shift
∆IOS Input Offset Current Shift
AVOL Large-Signal Voltage Gain
CMRR
VOL
Common Mode Rejection Ratio
Output Voltage Swing LOW
VOH Output Voltage Swing HIGH
ISC Short-Circuit Current
IS Supply Current
Positive Supply Current, SHDN
CONDITIONS
VCM = V + – 0.15
VCM = V – + 0.15
VCM = V + – 0.15 to V – + 0.15
VCM = V + – 0.15
VCM = V – + 0.15
VCM = V + – 0.15 to V – + 0.15
VCM = V + – 0.15
VCM = V – + 0.15
VCM = V + – 0.15 to V – + 0.15
VO = – 4.7V to 4.7V, RL = 10k
VO = – 4.5V to 4.5V, RL = 2k
VCM = V + – 0.15 to V – + 0.15
No Load
ISINK = 0.5mA
ISINK = 2.5mA
No Load
ISOURCE = 0.5mA
ISOURCE = 2.5mA
VSHDN = 0V
MIN TYP MAX
q 125 500
q 125 500
q 35 120
q
q – 80
80
q 160
q 40
q 40
q 40
q 300
q 200
2000
600
q 98
109
q V – + 0.005 V – + 0.015
q V – + 0.050 V – + 0.105
q V – + 0.200 V – + 0.620
q V+ – 0.015 V+ – 0.004
q V+ – 0.160 V+ – 0.070
q V+ – 1.000 V+ – 0.400
q5
10
q 420 525
q 18 60
UNITS
µV
µV
µV
nA
nA
nA
nA
nA
nA
V/mV
V/mV
dB
V
V
V
V
V
V
mA
µA
µA
5
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
THD + Noise vs
Peak-to-Peak Voltage
10
f = 1kHz
RL = 10k
(ALL CURVES)
1
Small-Signal Response
VS = ±15V
0.1
0.01
0.001
0
VS = ±1.5V VS = ±1.5V
AV = –1
AV = 1
VS = ±2.5V
AV = 1
VS = ±2.5V
AV = –1
1 234
INPUT VOLTAGE (PEAK-TO-PEAK)
5
LT1218/19 • TPC26
AV = 1
VS = ±15V
LT1218/18 • TPC27
LT1218/LT1219
Large-Signal Response
VS = ±15V
AV = 1
VS = ±15V
LT1218/18 • TPC28
APPLICATIONS INFORMATION
Rail-to-Rail Operation
The LT1218/LT1219 differ from conventional op amps in
the design of both the input and output stages. Figure 1
shows a simplified schematic of the amplifier. The input
stage consists of two differential amplifiers, a PNP stage
Q1/Q2 and an NPN stage Q3/Q4, which are active over
different portions of the input common mode range.
Lateral devices are used in both input stages, eliminating
the need for clamps across the input pins. Each input stage
is trimmed for offset voltage. A complementary output
configuration (Q23 through Q26) is employed to create an
TRIM
V+
BIAS
CONTROL
SHDN
I1
Q5
Q10
Q11
V–
D4 D5
Q16
IN+
IN –
Q12
V+
– 300mV
V–
Q3 Q4
Q6
V–
D1
Q1 Q2
D3
V+
D2
Q7
Q8 Q9
CC
Q14 Q15
V+
Q13
D7
Q18
Figure 1. LT1218 Simplified Schematic Diagram
D6
Q17 Q21
V–
V+
Q20
Q22
Q19
D7
Q24
Q23
V–
C1 OUT
C2
V+
Q25
Q26
D8
LT1218/19 • F01
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1219LCN8.PDF ] | |
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