LF298FE PHILIPS [NXP Semiconductors], LF298FE Datasheet
LF298FE
Manufacturer Part Number
LF298FE
Description
Sample-and-hold amplifiers
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.LF298FE.pdf
(5 pages)
Philips Semiconductors Linear Products
DESCRIPTION
The LF198/LF298/LF398 are monolithic sample-and-hold circuits
which utilize high-voltage ion-implant JFET technology to obtain
ultra-high DC accuracy with fast acquisition of signal and low droop
rate. Operating as a unity gain follower, DC gain accuracy is 0.002%
typical and acquisition time is as low as 6 s to 0.01%. A bipolar
input stage is used to achieve low offset voltage and wide
bandwidth. Input offset adjust is accomplished with a single pin and
does not degrade input offset drift. The wide bandwidth allows the
LF198 to be included inside the feedback loop of 1MHz op amps
without having stability problems. Input impedance of 10
high source impedances to be used without degrading accuracy.
P-channel junction FETs are combined with bipolar devices in the
output amplifier to give droop rates as low as 5mV/min with a 1 F
hold capacitor. The JFETs have much lower noise than MOS
devices used in previous designs and do not exhibit high
temperature instabilities. The overall design guarantees no
feedthrough from input to output in the hold mode even for input
signals equal to the supply voltages.
Logic inputs are fully differential with low input current, allowing
direct connection to TTL, PMOS, and CMOS; differential threshold is
1.4V. The LF198/LF298/LF398 will operate from 5V to 18V
supplies. They are available in 8-pin plastic DIP, 8-pin Cerdip, and
14-pin plastic SO packages.
FEATURES
ORDERING INFORMATION
August 31, 1994
8-Pin Ceramic Dual In-Line Package (CERDIP)
14-Pin Plastic Small Outline (SO) Package
8-Pin Ceramic Dual In-Line Package (CERDIP)
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Ceramic Dual In-Line Package (CERDIP)
8-Pin Plastic Dual In-Line Package (DIP)
Operates from 5V to 18V supplies
Less than 10 s acquisition time
TTL, PMOS, CMOS compatible logic input
0.5mV typical hold step at CH=0.01 F
Low input offset
0.002% gain accuracy
Low output noise in hold mode
Input characteristics do not change during hold mode
High supply rejection ratio in sample or hold
Wide bandwidth
Sample-and-hold amplifiers
DESCRIPTION
10
allows
879
PIN CONFIGURATIONS
APPLICATION
TEMPERATURE RANGE
The LF198/LF298/LF398 are ideally suited for a wide variety of
sample-and-hold applications, including data acquisition,
analog-to-digital conversion, synchronous demodulation, and
automatic test setup
-55 C to +125 C
-25 C to +85 C
-25 C to +85 C
OFFSET VOLTAGE
0 to +70 C
0 to +70 C
0 to +70 C
NOTE:
1. SO and non-standard pinouts.
OUTPUT
INPUT
INPUT
V+
V–
NC
NC
NC
NC
V–
FE, N Packages
1
2
3
4
1
2
3
4
5
6
7
D
LF198/LF298/LF398
1
TOP VIEW
TOP VIEW
Package
ORDER CODE
LF198FE
LF398FE
LF298FE
LF398D
LF398N
LF298N
8
7
6
5
14
13
12
11
10
9
8
LOGIC
LOGIC REFERENCE
C
OUTPUT
h
V
NC
V+
LOGIC
LOGIC REF
NC
C
OS
h
Product specification
Adj
853-0135 13721
DWG #
0175D
0580A
0580A
0404B
0580A
0404B
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LF298FE Summary of contents
Page 1
... LOGIC REFERENCE OUTPUT TOP VIEW 1 D Package Adj LOGIC 5 10 LOGIC REF TOP VIEW ORDER CODE DWG # LF198FE 0580A LF398D 0175D LF398FE 0580A LF398N 0404B LF298FE 0580A LF298N 0404B 853-0135 13721 ...
Page 2
Philips Semiconductors Linear Products Sample-and-hold amplifiers FUNCTIONAL DIAGRAM OFFSET 30k 3 INPUT 8 LOGIC 300 7 LOGIC REFERENCE 6 HOLD CAPACITOR ABSOLUTE MAXIMUM RATINGS SYMBOL V Supply voltage S Maximum power dissipation 3 T =25 C (still-air package ...
Page 3
Philips Semiconductors Linear Products Sample-and-hold amplifiers DC ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following conditions apply: unit is in “sample” mode; V and R = 10k . Logic reference voltage = 0V and logic voltage = 2.5V. L SYMBOL PARAMETER ...
Page 4
Philips Semiconductors Linear Products Sample-and-hold amplifiers TYPICAL DC PERFORMANCE CHARACTERISTICS Input Bias Current –5 –10 –15 –50 – 100 125 150 JUNCTION TEMPERATURE ( C) Hold Step 100 V+ = ...
Page 5
Philips Semiconductors Linear Products Sample-and-hold amplifiers TYPICAL AC PERFORMANCE CHARACTERISTICS Dynamic Sampling Error 100 330pF 10 330pF 1 –10 1000pF –100 0 100 1000 INPUT SLEW RATE (V/ms) Phase And Gain (Input to Output, Small-Signal ...