LT1995 Linear Technology, LT1995 Datasheet

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LT1995

Manufacturer Part Number
LT1995
Description
32MHz - 1000V/us Gain Selectable Amplifier
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Internal Gain Setting Resistors
Pin Configurable as a Difference Amplifier,
Inverting and Noninverting Amplifier
Difference Amplifier:
Noninverting Amplifier:
Inverting Amplifier:
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
Instrumentation Amplifier
Current Sense Amplifier
Video Difference Amplifier
Automatic Test Equipment
Gain Range 1 to 7
CMRR > 65dB
Gain Range 1 to 8
Gain Range –1 to –7
–15V TO 15V
RANGE
INPUT
+
High Slew Rate Differential Gain of 1
M1 M2 M4
P1 P2 P4
U
1k
2k
4k
4k
2k
1k
+
U
–15V
15V
LT1995
4k
4k
1995 TA01a
REF
OUT
DESCRIPTIO
The LT
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.
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Gain Selectable Amplifier
®
1995 is a high speed, high slew rate, gain select-
Large-Signal Transient (G = 1)
U
32MHz, 1000V/µs
www.DataSheet4U.com
1995 TA01b
LT1995
1995fb
1

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LT1995 Summary of contents

Page 1

... 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 ...

Page 2

... (MS10 (DD10 (MS10 (DD10 (MS10 (DD10 (MS10 (DD10) www.DataSheet4U.com ORDER PART NUMBER TOP VIEW LT1995CMS LT1995IMS – OUT MS PART MS PACKAGE MARKING* = 160°C/W (NOTE 6) JA LTBJD ...

Page 3

... 10pF 0.1V OUT 10V Step, 0.1 Step, 0.1 150Ω 150Ω 1MHz LT1995 www.DataSheet4U.com V MIN TYP MAX SUPPLY ±2.5V, ±5V, ±15V 0.5 2.5 ±2.5V, ±5V, ±15V 0.75 4.5 ±2.5V to ±15V 27 ±2.5V to ±15V 18 ±2.5V to ±15V 14 ± ...

Page 4

... LT1995 ELECTRICAL CHARACTERISTICS Difference Amplifier Configuration. V REF SYMBOL PARAMETER GE Gain Error V Input Offset Voltage OS Referred to Input (Note Input Offset Voltage Drift OS Referred to Input (Note Amp Input Offset Voltage OS_OA (Note 10) Input Voltage Range CMRR Common Mode Rejection Ratio Referred to Input ...

Page 5

... 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 – ...

Page 6

... LT1995 W U TYPICAL PERFOR A CE CHARACTERISTICS V Distribution ±15V PACKAGE –3.5 –1.5 –0.5 0.5 1.5 2.5 3.5 –2.5 INPUT OFFSET VOLTAGE (mV) 1995 G01 Change in Gain Error vs Resistive Load 0.05 = ±15V 25° ±12V V OUT –0.01 –0. – ...

Page 7

... Common Mode Rejection Ratio vs Frequency 100 = ±15V 25° 0pF 100 1k 10k 100k 1M FREQUENCY (Hz) 1995 G17 LT1995 120 140 160 1995 G12 G = – 100 125 1995 G15 10M 100M 1995 G18 1995fb 7 ...

Page 8

... LT1995 W U TYPICAL PERFOR A CE CHARACTERISTICS Power Supply Rejection Ratio vs Frequency 90 = ±15V 25° +PSRR 60 50 –PSRR –10 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 1995 G19 Slew Rate vs Input Level 1400 T = 25° ±15V V S 1200 G = –1 ...

Page 9

... G28 Small-Signal Transient (G = –1) = ±15V V 100ns/DIV S 1995 G31 Large-Signal Transient (G = –1) = ±15V V 100ns/DIV S 1995 G34 LT1995 www.DataSheet4U.com = ±5V = 25° ∞ 100pF 1000pF 0.01µF 0.1µF 1µF CAPACITIVE LOAD 1995 G29 Small-Signal Transient (Noninverting 100pF ± ...

Page 10

... LT1995 CTIO S (Difference Amplifier Configuration) P1 (Pin 1): Noninverting Gain-of-1 Input. Connects a 4k internal resistor to the op amp’s noninverting input. P2 (Pin 2): Noninverting Gain-of-2 Input. Connects a 2k internal resistor to the op amp’s noninverting input. P4 (Pin 3): Noninverting Gain-of-4 Input. Connects a 1k internal resistor to the op amp’s noninverting input. ...

Page 11

... 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 • (V OUT LT1995 www ...

Page 12

... W U Noninverting Gain Amplifier Input Attenuation The LT1995 can also be connected as a noninverting gain amplifier having an input attenuation network to provide a input is simply REF wide range of additional noninverting gain options. In combination with the feedback configurations for gains of ...

Page 13

... LT1995 OUT 1 P1 REF –V V REF – LT1995 OUT 1 P1 ...

Page 14

... LT1995 OUT 1 P1 REF – 7.00 www.DataSheet4U.com + LT1995 V OUT OUT 1 P1 REF – 1. LT1995 V OUT OUT 1 P1 REF ...

Page 15

... M INPUTS FOR DESIRED G PARAMETER; REFER TO FIGURE 2 FOR CONNECTIONS Figure 3. Noninverting Amplifier Input Attenuation Configurations (A > 0.5) AC-Coupling Methods for Single Supply Operation The LT1995 can be used in many single-supply applications using AC-coupling without additional biasing circuitry. AC-coupling the LT1995 in a difference amplifier configu- ...

Page 16

... LT1995 U U APPLICATIO S I FOR ATIO Using the LT1995 as an AC-coupled inverting gain stage, the REF pin and the relevant P inputs may all be driven from a V source as depicted in the example of Figure 6, thus BIAS establishing the quiescent voltage on the input and output pins ...

Page 17

... AC-coupled to ground. Figure 8 illustrates a complete example circuit of an externally biased AC-coupled nonin- verting amplifier. The V source impedance should be BIAS low (a few ohms) to avoid degrading the inherent accuracy of the LT1995. 0.013% of additional Gain Error for each ohm of resistance on the REF pin is typical ...

Page 18

... Network for (1 ≤ G ≤ Frequency Compensation The LT1995 comfortably drives heavy resistive loads such as back-terminated cables and provides nicely damped responses for all gain configurations when doing so. Small capacitances are included in the on-chip resistor network to optimize bandwidth in the basic difference gain configurations of Figure 1 ...

Page 19

... DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LT1995 www.DataSheet4U.com 3.00 ± 0.102 (.118 ± .004) 0.497 ± 0.076 (NOTE 3) (.0196 ± ...

Page 20

... Differential Input and Output, Rail-to-Rail Output 10,000pF, Adjustable Common Mode Voltage 3 Gain Configurations, Rail-to-Rail Input and Output www.linear.com ● www.DataSheet4U.com Tracking Negative Reference 3V 1.25V LT1790-1.25 M1 LT1995 1µF –1.25V G = –1 REF P1 1995 TA03 –3V Current Sense with Alarm 15V LT6700-3 ...

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