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PDF LT1800CS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1800CS8 | |
| Descripción | 80MHz/ 25V/ms Low Power Rail-to-Rail Input and Output Precision Op Amp | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1800
80MHz, 25V/µs Low Power
Rail-to-Rail Input and Output
Precision Op Amp
FEATURES
s Gain Bandwidth Product: 80MHz
s Input Common Mode Range Includes Both Rails
s Output Swings Rail-to-Rail
s Low Quiescent Current: 2mA Max
s Input Offset Voltage: 350µV Max
s Input Bias Current: 250nA Max
s Low Voltage Noise: 8.5nV/√Hz
s Slew Rate: 25V/µs
s Common Mode Rejection: 105dB
s Power Supply Rejection: 97dB
s Open-Loop Gain: 85V/mV
s Available in the 8-Pin SO and 5-Pin Low Profile
(1mm) ThinSOTTM Packages
s Operating Temperature Range: – 40°C to 85°C
U
APPLICATIO S
s Low Voltage, High Frequency Signal Processing
s Driving A/D Converters
s Rail-to-Rail Buffer Amplifiers
s Active Filters
s Video Line Driver
DESCRIPTIO
The LT®1800 is a low power, high speed rail-to-rail input
and output operational amplifier with excellent DC perfor-
mance. The LT1800 features reduced supply current, lower
input offset voltage, lower input bias current and higher
DC gain than other devices with comparable bandwidth.
The LT1800 has an input range that includes both supply
rails and an output that swings within 20mV of either sup-
ply rail to maximize the signal dynamic range in low supply
applications.
The LT1800 maintains its performance for supplies from
2.3V to 12.6V and is specified at 3V, 5V and ±5V supplies.
The inputs can be driven beyond the supplies without
damage or phase reversal of the output.
The LT1800 is available in the 8-pin SO package with the
standard op amp pinout and in the 5-pin SOT-23 package.
For dual and quad versions of the LT1800, see the LT1801/
LT1802 data sheet. The LT1800 can be used as a plug-in
replacement for many op amps to improve input/output
range and performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Supply 1A Laser Driver Amplifier
5V
VIN
DO NOT FLOAT
+
LT1800
–
R3
10Ω
C1
39pF
R2
330Ω
Q1
ZETEX
FMMT619
IR LASER
INFINEON
SFH495
R1
1Ω
1800 TA01
Laser Driver Amplifier
500mA Pulse Response
100mA/DIV
50ns/DIV
1800 TA02
1800f
1
1 page  
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
AVOL
CMRR
PSRR
VOL
VOH
ISC
IS
GBW
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Input Common Mode Range
Power Supply Rejection Ratio
Output Voltage Swing Low (Note 7)
Output Voltage Swing High (Note 7)
Short-Circuit Current
Supply Current per Amplifier
Gain Bandwidth Product
VO = –4V to 4V, RL = 1k
VO = –2V to 2V, RL = 100Ω
VCM = VS– to 3.5V
VS+ = 2.5V to 10V, VS– = 0V
No Load
ISINK = 5mA
ISINK = 20mA
No Load
ISOURCE = 5mA
ISOURCE = 20mA
Frequency = 2MHz
SR
FPBW
HD
tS
∆G
∆θ
Slew Rate
Full Power Bandwidth
Harmonic Distortion
Settling Time
Differential Gain (NTSC)
Differential Phase (NTSC)
AV = – 1, RL = 1k, VO = ±4V, Measured at VO = ±2V
VO = 8VP-P
AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz
0.01%, VSTEP = 5V, AV = 1V, RL = 1k
AV = + 2, RL = 150Ω
AV = + 2, RL = 150Ω
LT1800
MIN TYP MAX
25 70
2.5 7
85 109
VS– VS+
80 97
15 60
85 170
225 450
17 70
130 260
450 750
30 50
1.8 2.75
70
23
0.9
– 75
300
0.35
0.2
UNITS
V/mV
V/mV
dB
V
dB
mV
mV
mV
mV
mV
mV
mA
mA
MHz
V/µs
MHz
dBc
ns
%
Deg
The q denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless
otherwise noted.
SYMBOL PARAMETER
VOS Input Offset Voltage
∆VOS
VOS TC
IB
Input Offset Shift
Input Offset Voltage Drift (Note 8)
Input Bias Current
IOS Input Offset Current
AVOL Large-Signal Voltage Gain
CMRR
PSRR
VOL
Common Mode Rejection Ratio
Input Common Mode Range
Power Supply Rejection Ratio
Output Voltage Swing Low (Note 7)
VOH Output Voltage Swing High (Note 7)
CONDITIONS
VCM = VS–
VCM = VS– (SOT-23)
VCM = VS+
VCM = VS+ (SOT-23)
VCM = VS– to VS+ – 1.5V
VCM = VS– + 1V
VCM = VS+ – 0.2V
VCM = VS– + 1V
VCM = VS+ – 0.2V
VO = –4V to 4V, RL = 1k
VO = –2V to 2V, RL = 100Ω
VCM = VS– to 3.5V
VS+ = 2.5V to 10V, VS– = 0V
No Load
ISINK = 5mA
ISINK = 20mA
No Load
ISOURCE = 5mA
ISOURCE = 20mA
MIN
q
q
q
q
q
q
q
q
q
q
q 20
q2
q 82
q VS–
q 74
q
q
q
q
q
q
TYP MAX
200 800
450 1500
0.75 4
15
45 675
1.5 5
30 400
450 1750
25 300
25 300
55
5
105
VS+
91
17 70
105 210
250 575
25 90
150 310
600 975
UNITS
µV
µV
mV
mV
µV
µV/°C
nA
nA
nA
nA
V/mV
V/mV
dB
V
dB
mV
mV
mV
mV
mV
mV
1800f
5
5 Page 
TYPICAL PERFOR A CE CHARACTERISTICS
±5V Large-Signal Response
±5V Small-Signal Response
LT1800
Output Overdriven Recovery
2V/DIV
0V
50mV/DIV
0V
VS = ±5V
AV = 1
RL = 1k
200ns/DIV
1800 G35
VS = ±5V
AV = 1
RL = 1k
50ns/DIV
1800 G36
VIN
1V/DIV
0V
VOUT
2V/DIV
0V
VS = 5V, 0V
AV = 2
RL = 1k
100ns/DIV
1800 G37
APPLICATIO S I FOR ATIO
Circuit Description
The LT1800 has an input and output signal range that
covers from the negative power supply to the positive
power supply. Figure 1 depicts a simplified schematic of
the amplifier. The input stage is comprised of two differ-
ential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/
Q4 that are active over the different ranges of common
mode input voltage. The PNP differential pair is active
between the negative supply to approximately 1.2V below
the positive supply. As the input voltage moves closer
toward the positive supply, the transistor Q5 will steer the
tail current I1 to the current mirror Q6/Q7, activating the
NPN differential pair and the PNP pair becomes inactive
for the rest of the input common mode range up to the
positive supply. Also at the input stage, devices Q17 to
Q19 act to cancel the bias current of the PNP input pair.
When Q1-Q2 are active, the current in Q16 is controlled to
be the same as the current in Q1-Q2, thus the base current
V+
+
I2
Q16
V–
R3 R4
R5
V+ V–
ESDD1
ESDD2
D1
+IN
–IN
ESDD4
D6 D8
D5 D7
ESDD3
D2
Q4 Q3
V– V+
Q17 Q18
Q19 Q7
+
I1
Q5 VBIAS
Q1 Q2
D3
D4
Q6
Q11 Q12
Q13
C2
+
I3
CC V–
BUFFER
AND
Q10 OUTPUT BIAS
Q9
Q8
C1
R1 R2
Q15
OUT
Q14
1800 F01
Figure 1. LT1800 Simplified Schematic Diagram
1800f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1800CS8.PDF ] | |
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