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PDF LT1995 Data sheet ( Hoja de datos )
| Número de pieza | LT1995 | |
| Descripción | 32MHz - 1000V/us Gain Selectable Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Internal Gain Setting Resistors
■ Pin Configurable as a Difference Amplifier,
Inverting and Noninverting Amplifier
■ Difference Amplifier:
Gain Range 1 to 7
CMRR > 65dB
■ Noninverting Amplifier:
Gain Range 1 to 8
■ Inverting Amplifier:
Gain Range –1 to –7
■ Gain Error: <0.2%
■ Slew Rate: 1000V/µs
■ Bandwidth: 32MHz (Gain = 1)
■ Op Amp Input Offset Voltage: 2.5mV Max
■ Quiescent Current: 9mA Max
■ Wide Supply Range: ±2.5V to ±15V
■ Available in 10-Lead MSOP and
10-Lead (3mm × 3mm) DFN Packages
U
APPLICATIO S
■ Instrumentation Amplifier
■ Current Sense Amplifier
■ Video Difference Amplifier
■ Automatic Test Equipment
TYPICAL APPLICATIO
High Slew Rate Differential Gain of 1
M1 M2 M4
1k
15V
4k
OUT
–
INPUT
RANGE
–15V TO 15V
+
2k
4k –
4k +
2k LT1995
1k 4k
P1 P2 P4
–15V
REF
1995 TA01a
LT1995www.DataSheet4U.com
32MHz, 1000V/µs
Gain Selectable Amplifier
DESCRIPTIO
The LT®1995 is a high speed, high slew rate, gain select-
able amplifier with excellent DC performance. Gains from
–7 to 8 with a gain accuracy of 0.2% can be achieved using
no external components. The device is particularly well
suited for use as a difference amplifier, where the excellent
resistor matching results in a typical common mode
rejection ratio of 79dB.
The amplifier is a single gain stage design similar to the
LT1363 and features superb slewing and settling charac-
teristics. Input offset of the internal operational amplifier
is less than 2.5mV and the slew rate is 1000V/µs. The
output can drive a 150Ω load to ±2.5V on ±5V supplies,
making it useful in cable driver applications.
The resistors have excellent matching, 0.2% maximum at
room temperature and 0.3% from –40°C to 85°C. The
temperature coefficient of the resistors is typically
–30ppm/°C. The resistors are extremely linear with volt-
age, resulting in a gain nonlinearity of 10ppm.
The LT1995 is fully specified at ±2.5V, ±5V and ±15V sup-
plies and from –40°C to 85°C. The device is available in
space saving 10-lead MSOP and 10-Lead (3mm × 3mm)
DFN packages. For a micropower precision amplifier with
precision resistors, see the LT1991 and LT1996.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Large-Signal Transient (G = 1)
1995 TA01b
1995fb
1
1 page  
LT1995www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C.
Difference Amplifier Configuration. VREF = VCM = 0V and unused gain pins are unconnected, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
VSUPPLY
MIN TYP MAX UNITS
VOS Input Offset Voltage
G = 1 (MS10)
Referred to Input (Note 7)
G = 1 (DD10)
G = 2 (MS10)
G = 2 (DD10)
G = 4 (MS10)
G = 4 (DD10)
G = 1 (MS10)
G = 1 (DD10)
G = 1 (MS10)
G = 1 (DD10)
±15V
±15V
±15V
±15V
±15V
±15V
±5V
±5V
±2.5V
±2.5V
●
1.2 7.5
mV
●
1.6 13
mV
●
0.9 6
mV
●
1.2 10
mV
●
0.7 5.5
mV
●
0.9 8.5
mV
●
1.1 7.5
mV
●
1.4 13
mV
●
1.1 7.5
mV
●
1.5 13
mV
VOS TC
Input Offset Voltage Drift
Referred to Input (Note 9)
G = 1 (MS10)
G = 1 (DD10)
±15V
±15V
● 10 26 µV/°C
● 10 35 µV/°C
VOS_OA
Op Amp Input Offset Voltage
(Note 10)
G = 1 (MS10)
G = 1 (DD10)
±2.5V, ±5V, ±15V ●
±2.5V, ±5V, ±15V ●
0.6 3.75
0.8 6.5
mV
mV
Input Voltage Range
G=1
±15V
±5V
±2.5V
● ±15
● ±5
● ±1
±15.5
±5.5
±1.5
V
V
V
CMRR
Common Mode Rejection Ratio
Referred to Input
VCM = ±15V, G = 1
VCM = ±15V, G = 2
VCM = ±15V, G = 4
VCM = ±5V, G = 1
VCM = ±1V, G = 1
±15V
±15V
±15V
±5V
±2.5V
● 62
● 68
● 72
● 61
● 57
77
83
86
72
66
dB
dB
dB
dB
dB
PSRR Power Supply Rejection Ratio P1 = M1 = 0V, G = 1, VS = ±2.5V to ±15V
● 74
86
dB
VOUT Output Voltage Swing
RL = 1k
RL = 500Ω
RL = 500Ω
RL = 500Ω
±15V
±15V
±5V
±2.5V
● ±13
● ±12.5
● ±3.3
● ±1.1
±14
±13.5
±4
±2
V
V
V
V
ISC Short-Circuit Current
G=1
±15V
● ±50 ±105
mA
SR Slew Rate
G = –2, VOUT = ±12V, P2 = 0V
Measured at VOUT = ±10V
±15V
● 550
900
V/µs
IS Supply Current
G=1
±15V
±5V
●
8.0 11.0
mA
●
7.6 10.4
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The inputs are protected by diodes connected to VS+ and VS–.
If an input goes beyond the supply range, the input current should be
limited to 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 4: The LT1995C and LT1995I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 5: The LT1995C is guaranteed to meet specified performance from
0°C to 70°C. The LT1995C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1995I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 6: Thermal resistance (θJA) varies with the amount of PC board metal
connected to the leads. The specified values are for short traces connected
to the leads. If desired, the thermal resistance can be reduced slightly in
the MS package to about 130°C/W by connecting the used leads to a
larger metal area. A substantial reduction in thermal resistance down to
about 50°C/W can be achieved by connecting the Exposed Pad on the
bottom of the DD package to a large PC board metal area which is either
open-circuited or connected to VS–.
Note 7: Input offset voltage is pulse tested and is exclusive of warm-up
drift. VOS and VOS TC refer to the input offset of the difference amplifier
configuration. The equivalent input offset of the internal op amp can be
calculated from VOS_OA = VOS • G/(G +1).
Note 8: Full Power bandwidth is calculated from the slew rate measure-
ment: FPBW = SR/2πVP.
Note 9: This parameter is not 100% tested.
Note 10: The input offset of the internal op amp is calculated from the
input offset voltage: VOS_OA = VOS • G/(G +1).
1995fb
5
5 Page 
BLOCK DIAGRA
P1
1
P2
2
P4
3
M4
8
M2
9
M1
10
VS+
7
RP1 = 4k
0.5pF
RP2 = 2k
RFB = 4k
0.3pF
REF
5
RP4 = 1k
+
RM4 = 1k
–
RM2 = 2k
0.5pF
RM1 = 4k
0.3pF
RFB = 4k
VS–
4
OUT
6
1995 BD
LT1995www.DataSheet4U.com
APPLICATIO S I FOR ATIO
Configuration Flexibility
The LT1995 combines a high speed precision operational
amplifier with eight ratio-matched on-chip resistors. The
resistor configuration and pinout of the device is shown in
the Block Diagram. The topology is extremely versatile and
provides for simple realizations of most classic functional
configurations including difference amplifiers, inverting
gain stages, noninverting gain stages (including Hi-Z
input buffers) and summing amplifiers. The LT1995 deliv-
ers load currents of at least 30mA, making it ideal for cable
driving applications as well.
The input voltage range depends on gain and configura-
tion. ESD diodes will clamp any input voltage that exceeds
the supply potentials by more than several tenths of a volt;
and the internal op amp input ports must remain at least
1.75V within the rails to assure normal operation of the
part. The output will swing to within one and a half volts of
the rails, which in low supply voltage and high gain
configurations will create a limitation on the usable input
range. It should be noted that while the internal op amp can
withstand transient differential input voltages of up to 10V
without damage, this does generate large supply current
increases (tens of mA) as required for high slew rates. If
the device is used with sustained differential input across
the internal op amp (such as when the output is clipping),
the average supply current will increase, excessive power
dissipation will result, and the part may be damaged (i.e.,
the LT1995 is not recommended for use in comparator
applications or with the output clipped).
Difference Amplifier
The LT1995 can be connected as a classic difference
amplifier with an output function given by:
VOUT = G • (VIN+ – VIN–) + VREF
1995fb
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT1995.PDF ] | |
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