The LFx5x devices are the first monolithic JFET input operational amplifiers to incorporate well-matched, high-voltage JFETs on the same chip with standard bipolar transistors (BI-FET™ Technology). These amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, coupled with offset adjust, which does not degrade drift or common-mode rejection. The devices are also designed for high slew rate, wide bandwidth, extremely fast settling time, low voltage and current noise and a low 1/f noise corner.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LFx5x | SOIC (8) | 4.90 mm × 3.91 mm |
TO-CAN (8) | 9.08 mm × 9.08 mm | |
PDIP (8) | 9.81 mm × 6.35 mm |
Changes from C Revision (March 2013) to D Revision
Changes from B Revision (March 2013) to C Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BALANCE | 1, 5 | I | Balance for input offset voltage |
+INPUT | 3 | I | Noninverting input |
–INPUT | 2 | I | Inverting input |
NC | 8 | — | No connection |
OUTPUT | 6 | O | Output |
V+ | 7 | — | Positive power supply |
V– | 4 | — | Negative power supply |
MIN | MAX | UNIT | ||||
---|---|---|---|---|---|---|
Supply voltage | LF155x, LF256x, LF356B | ±22 | V | |||
LF35x | ±18 | |||||
Differential input voltage | LF15x, LF25x, LF356B | ±40 | V | |||
LF35x | ±30 | |||||
Input voltage(2) | LF15x, LF25x, LF356B | ±20 | V | |||
LF35x | ±16 | |||||
Output short circuit duration | Continuous | — | ||||
TJMAX | LMC package | LF15x | 150 | °C | ||
LF25x, LF356B, LF35x | 115 | |||||
P package | LF25x, LF356B, LF35x | 100 | ||||
D package | LF25x, LF356B, LF35x | 100 | ||||
Soldering information (lead temp.) |
TO-99 package | Soldering (10 sec.) | 300 | °C | ||
PDIP package | Soldering (10 sec.) | 260 | ||||
SOIC package | Vapor phase (60 sec.) | LF25x, LF356B, LF35x | 215 | |||
Infrared (15 sec.) | LF25x, LF356B, LF35x | 220 | ||||
Storage temperature, Tstg | −65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(2) | ±1000 | V |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
Supply voltage, VS | LF15x | ±15 | VS | ±20 | V |
LF25x | ±15 | VS | ±20 | ||
LF356B | ±15 | VS | ±20 | ||
LF35x | ±15 | ||||
TA | LF15x | –55 | TA | 125 | °C |
LF25x | –25 | TA | 85 | ||
LF356B | 0 | TA | 70 | ||
LF35x | 0 | TA | 70 |
THERMAL METRIC(1) | LF155, LF156, LF355, LF357 | LF356 | UNIT | ||||
---|---|---|---|---|---|---|---|
P (PDIP) | D (SOIC) | LMC (TO-99) | P (PDIP) | ||||
8 PINS | 8 PINS | 8 PINS | 8 PINS | ||||
RθJA | Junction-to-ambient thermal resistance | 130 | 195 | — | 55.2 | °C/W | |
Still Air | — | — | 160 | — | |||
400 LF/Min Air Flow | — | — | 65 | — | |||
RθJC(top) | Junction-to-case (top) thermal resistance | — | — | 23 | 44.5 | °C/W | |
RθJB | Junction-to-board thermal resistance | — | — | — | 32.4 | °C/W | |
ψJT | Junction-to-top characterization parameter | — | — | — | 21.7 | °C/W | |
ψJB | Junction-to-board characterization parameter | — | — | — | 32.3 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|---|---|
SR | Slew Rate | LF15x: AV = 1 | LFx55 | 5 | V/μs | |||
LFx56, LF356B | 7.5 | |||||||
LFx56, LF356B | 12 | |||||||
LF357: AV = 5 | LFx57 | 50 | ||||||
GBW | Gain Bandwidth Product | LFx55 | 2.5 | MHz | ||||
LFx56, LF356B | 5 | |||||||
LFx57 | 20 | |||||||
ts | Settling Time to 0.01%(1) | LFx55 | 4 | μs | ||||
LFx56, LF356B | 1.5 | |||||||
LFx57 | 1.5 | |||||||
en | Equivalent Input Noise Voltage | RS = 100 Ω | f = 100 Hz | LFx55 | 25 | nV/√Hz | ||
LFx56, LF356B | 15 | |||||||
LFx57 | 15 | |||||||
f = 1000 Hz | LFx55 | 20 | nV/√Hz | |||||
LFx56, LF356B | 12 | |||||||
LFx57 | 12 | |||||||
in | Equivalent Input Current Noise | f = 100 Hz | LFx55 | 0.01 | pA/√Hz | |||
LFx56, LF356B | ||||||||
LFx57 | ||||||||
f = 1000 Hz | LFx55 | 0.01 | pA/√Hz | |||||
LFx56, LF356B | ||||||||
LFx57 | ||||||||
CIN | Input Capacitance | LFx55 | 3 | pF | ||||
LFx56, LF356B | ||||||||
LFx57 |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
Supply current | LF155 | 2 | 4 | mA | |
LF355 | 2 | 4 | |||
LFx56, LF356B | 5 | 7 | |||
LF356 | 5 | 10 | |||
LF357 | 5 | 10 |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|---|---|
VOS | Input offset voltage | RS = 50 Ω | TA = 25°C | LF15x, LF25x, LF356B | 3 | 5 | mV | |
LF35x | 3 | 10 | ||||||
Over temperature | LF15x | 7 | ||||||
LF25x, LF356B | 6.5 | |||||||
LF35x | 13 | |||||||
ΔVOS/ΔT | Average TC of input offset voltage |
RS = 50 Ω | LF15x, LF25x, LF356B, LF35x | 5 | μV/°C | |||
ΔTC/ΔVOS | Change in average TC with VOS adjust | RS = 50 Ω(3) | LF15x, LF25x, LF356B, LF35x | 0.5 | μV/°C per mV |
|||
IOS | Input offset current | TJ = 25°C(1) (4) | LF15x, LF25x, LF356B | 3 | 20 | pA | ||
LF35x | 3 | 50 | ||||||
TJ ≤ THIGH | LF15x | 20 | nA | |||||
LF25x, LF356B | 1 | |||||||
LF35x | 2 | |||||||
IB | Input bias current | TJ = 25°C(1) (4) | LF15x, LF25x, LF356B | 30 | 100 | pA | ||
LF35x | 30 | 200 | ||||||
TJ ≤ THIGH | LF15x | 50 | nA | |||||
LF25x, LF356B | 5 | |||||||
LF35x | 8 | |||||||
RIN | Input resistance | TJ = 25°C | LF15x, LF25x, LF356B, LF35x | 1012 | Ω | |||
AVOL | Large signal voltage gain | VS = ±15 V, VO = ±10 V, RL = 2 kΩ |
TA = 25°C | LF15x, LF25x, LF356B | 50 | 200 | V/mV | |
LF35x | 25 | 200 | ||||||
Over temperature | LF15x, LF25x, LF356B | 25 | ||||||
LF35x | 15 | |||||||
VO | Output voltage swing | VS = ±15 V, RL = 10 kΩ | LF15x, LF25x, LF356B, LF35x | ±12 | ±13 | V | ||
VS = ±15 V, RL= 2 kΩ | LF15x, LF25x, LF356B, LF35x | ±10 | ±12 | |||||
VCM | Input common-mode voltage range |
VS = ±15 V | VCM, High | LF15x, LF25x, LF356B | 11 | 15.1 | V | |
LF35x | 10 | 15.1 | ||||||
VCM, Low | LF15x, LF25x, LF356B | −12 | –11 | |||||
LF35x | −12 | –10 | ||||||
CMRR | Common-mode rejection ratio | LF15x, LF25x, LF356B | 85 | 100 | dB | |||
LF35x | 80 | 100 | ||||||
PSRR | Supply voltage rejection ratio(5) | LF15x, LF25x, LF356B | 85 | 100 | dB | |||
LF35x | 80 | 100 |
LF15x | LF25x | LF356B | LF35x | |
Supply Voltage, VS | ±15 V ≤ VS ≤ ±20 V | ±15 V ≤ VS ≤ ±20 V | ±15 V ≤ VS ≤ ±20 V | VS = ±15 V |
TA | −55°C ≤ TA ≤ +125°C | −25°C ≤ TA ≤ +85°C | 0°C ≤ TA ≤ +70°C | 0°C ≤ TA ≤ +70°C |
THIGH | +125°C | +85°C | +70°C | +70°C |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
Power Dissipation at TA = 25°C (1) (2) |
LMC Package (Still Air) | LF15x | 560 | mW | |
LF25x, LF356B, LF35x | 400 | ||||
LMC Package (400 LF/Min Air Flow) |
LF15x | 1200 | |||
LF25x, LF356B, LF35x | 1000 | ||||
P Package | LF25x, LF356B, LF35x | 670 | |||
D Package | LF25x, LF356B, LF35x | 380 |
These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET Technology). These amplifiers feature low input bias and offset currents, as well as low offset voltage and offset voltage drift, coupled with offset adjust which does not degrade drift or common-mode rejection. These devices can replace expensive hybrid and module FET operational amplifiers. Designed for low voltage and current noise and a low 1/f noise corner, these devices are excellent for low noise applications using either high or low source impedance.
These are operational amplifiers with JFET input devices. These JFETs have large reverse breakdown voltages from gate to source and drain eliminating the need for clamps across the inputs. Therefore large differential input voltages can easily be accommodated without a large increase in input current. The maximum differential input voltage is independent of the supply voltages. However, neither of the input voltages should be allowed to exceed the negative supply as this will cause large currents to flow which can result in a destroyed unit.
These amplifiers will operate with the common-mode input voltage equal to the positive supply. In fact, the common-mode voltage can exceed the positive supply by approximately 100 mV independent of supply voltage and over the full operating temperature range. The positive supply can therefore be used as a reference on an input as, for example, in a supply current monitor and/or limiter.
The LFx5x has a single functional mode and operates according to the conditions listed in the Recommended Operating Conditions.