NSC CLC111AJE

CLC111
Ultra High Slew Rate, Closed Loop Buffer
General Description
The CLC111 is a high performance, closed loop, monolithic
buffer designed for applications requiring very high
frequency signals. The CLC111’s high performance includes
an extremely fast 800MHz small signal bandwidth (0.5pp)
and an ultra high (3500V/µs) slew rate while requiring only
10.5mA quiescent current. Signal fidelity is maintained with
low harmonic distortion (−62dBc 2nd and 3rd harmonics at
20MHz). These performance characteristics are for a
demanding 100Ω load.
Featuring a patented closed loop design, the CLC111 offers
nearly ideal unity gain (0.996) with a very low (1.4Ω) output
impedance. The CLC111 is ideally suited for buffering video
signals with its 0.15%/0.04˚ differential gain and phase
performance at 4.43MHz. Power sensitive applications will
benefit from the CLC111’s excellent performance on reduced
or single supply voltages.
Constructed using an advanced, complementary bipolar
process and National’s proven high performance
architectures, the CLC111 is available in several versions to
meet a variety of requirements.
Enhanced Solutions (Military/Aerospace)
SMD Number: contact factory
Space level versions also available.
For more information, visit http://www.national.com/mil
n
n
n
n
n
Very low output impedance (1.4Ω)
Low (−62dBc) 2nd/3rd harmonics @ 20MHz
60mA output current ( ± 5 supplies)
Single supply operation (0 to 3V supply min.)
Evaluation boards and Spice models
Applications
n
n
n
n
n
Video switch buffers
Test point drivers
High frequency active filters
Wideband DC clamping buffer
High-speed peak detector circuits
Pulse Response for ± 5V
Features
n Very wideband (800MHz)
n Ultra high (3500V/µs) slew rate
DS012720-1
Connection Diagram
DS012720-2
Pinout
DIP & SOIC
© 2001 National Semiconductor Corporation
DS012720
www.national.com
CLC111 Ultra High Slew Rate, Closed Loop Buffer
February 2001
CLC111
Typical Application
DS012720-4
Single-Supply Circuit
DS012720-16
Pulse Response
DS012720-5
Small Signal Bandwidth
Ordering Information
Package
Temperature Range
Industrial
Part Number
Package
Marking
NSC
Drawing
8-pin plastic DIP
−40˚C to +85˚C
CLC111AJP
CLC111AJP
N08E
8-pin plastic SOIC
−40˚C to +85˚C
CLC111AJE
CLC111AJE
M08A
www.national.com
2
Operating Temperature Range
Storage Temperature Range
Lead Solder Duration (+300˚C)
ESD rating
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
± 7.0V
Supply Voltage (VCC)
IOUT
Output is short circuit protected to
ground, but maximum reliability will
be maintained if IOUT does not
exceed...
Input Voltage
Maximum Junction Temperature
Range
40˚C to +85˚C
−65˚C to +150˚C
10 sec
1000V
Operating Ratings
Thermal Resistance
Package
MDIP
SOIC
80mA
± VCC
(θJC)
70˚C/W
65˚C/W
(θJA)
125˚C/W
145˚C/W
+150˚C
Electrical Characteristics
± VCC = ± 5V, RL = 100Ω; unless specified
Symbol
Parameter
Ambient Temperature
Conditions
Typ
CLC111AJ
Min/Max Ratings (Note 2)
+25˚C
−40˚C
+25˚C
+85˚C
Units
Frequency Domain Response
SSBW
LSBW
Small Signal Bandwidth
VOUT < 0.5VPP
800
400
400
300
MHz
Small Signal Bandwidth
VOUT
450
250
250
200
MHz
Gain Flatness
VOUT
< 4.0VPP
< 0.5VPP
GFL
Flatness
DC-50MHz
0.02
± 0.1
± 0.1
± 0.2
dB
GFPH
Peaking
DC-200MHz
0.1
1.0
0.5
0.5
dB
Rolloff
GFRH
DC-200MHz
0.1
0.8
0.8
1.2
dB
DG
Differential Gain
RL = 150Ω,
4.43MHz,
0.15
0.4
0.25
0.25
%
DP
Differential Phase
RL = 150Ω,
4.43MHz
0.04
0.08
0.08
0.08
deg
0.5V step
0.6
0.8
0.8
1.1
ns
Time Domain Response
TRS
Rise and Fall Time
TRL
4.0V step
1.0
1.4
1.4
1.7
ns
TS
Settling Time to ± 0.1%
2.0V Step
16
20
20
20
ns
OS1
Overshoot
4V Step
0
8
5
5
%
SR
Slew Rate
4V Step
3500
2700
2700
2300
V/µsec
Distortion And Noise Performance
HD2
2nd Harmonic Distortion
2VPP, 20MHz
−62
−47
−50
−50
dBc
HD3
3rd Harmonic Distortion
2VPP, 20MHz
−62
−55
−55
−52
dBc
VN
Voltage
> 1MHz
4.0
4.8
4.8
5.3
nV/
ICN
Current
> 1MHz
1.6
4.0
3.0
3.0
pA/
Equivalent Output Noise
Static, DC Performance
GA1
Small Signal Gain
No Load
0.996
0.994
0.994
0.992
V/V
GA2
Small Signal Gain
100Ω Load
.98
.96
.97
.97
V/V
RO
Output Resistance
DC
1.4
3.0
2.0
2.0
Ω
VIO
Output Offset Voltage (Note 3)
2
17
9
9
mV
DVIO
Average Temperature
Coefficient
± 30
± 100
-
± 50
µV/˚C
IBN
Input Bias Current (Note 3)
5
30
15
15
µA
DIBN
Average Temperature
Coefficient
50
± 187
-
± 100
nA/˚C
PSRR
Power Supply Rejection Ratio
−52
−48
−48
−46
dB
3
www.national.com
CLC111
Absolute Maximum Ratings (Note 1)
CLC111
Electrical Characteristics
(Continued)
± VCC = ± 5V, RL = 100Ω; unless specified
Symbol
Parameter
Conditions
Typ
Min/Max Ratings (Note 2)
Units
No Load
10.5
12
12
12
± 2V, Full Scale
0.2
1.0
0.5
0.5
%
1
0.3
0.7
1
MΩ
Static, DC Performance
ICC
Supply Current (Note 3)
mA
Miscellaneous Performance
ILIN
Integral Endpoint Linearity
RIN
Input Resistance
CIN
Input Capacitance
CERDIP
2.5
3.5
3.5
3.5
pF
CIN
Input Capacitance
Plastic DIP
1.25
2.0
2.0
2.0
pF
VO
Output Voltage Range
No Load
3.9
3.5
3.6
3.6
V
VOL
Output Voltage Range
RL = 100Ω
3.5
+3.1,−2.5
3.2
3.2
V
VOL
Output Voltage Range
RL = 100Ω, 0˚C
IO
Output Current
60
50,25
50
40
mA
IO
Output Current
50,35
50
50
mA
± 3.1
0˚-70˚C
V
Electrical Characteristics
VCC =+3V or VCC =+5V, −VEE =0V, TA =+25˚C, RL =100Ω; unless specified
Symbol
Parameter
Conditions
VCC =
3V
VCC =
5V
Units
120
300
MHz
210
MHz
Frequency Domain Response
SSBW
−3dB Bandwidth
VOUT < 0.5VPP
LSBW
−3dB Bandwidth
VOUT < 2.0VPP
Gain Flatness
VOUT < 0.5VPP
GFL
Flatness
DC-30MHz
0.5
0.1
dB
GFPH
Peaking
DC-200MHz
0
0
dB
GFRH
Rolloff
DC-60MHz
1.5
0.25
dB
3.9
1.2
ns
1.5
ns
Time Domain Response
TRS
Rise and Fall Time
0.5V step
TRL
Rise and Fall Time
2.0V step
OS1
Overshoot
1.0V step
3
3
%
SR
Slew Rate
0.5V step
260
425
V/µsec
0.5VPP, 20MHz
−46
Distortion And Noise Performance
HD2
2nd Harmonic Distortion
HD3
3rd Harmonic Distortion
1.0VPP, 20MHz
0.5VPP, 20MHz
dBc
−55
−44
1.0VPP, 20MHz
dBc
−64
Static, DC Performance
GA1
Small Signal Gain
AC coupled
RL = ∞
0.96
0.97
V/V
2.0
4.5
mA
Miscellaneous Performance
VO
Output Voltage Range
RL = ∞
1.5
3.4
VPP
VOL
Output Voltage Range
RL = 100Ω
1.1
2.6
VPP
www.national.com
4
(Continued)
Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation.
Note 2: Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined
from tested parameters.
Note 3: AJ-level: spec. is 100% tested at +25˚C.
Typical Performance Characteristics
Frequency Response vs. Output Swing
Output Impedance
DS012720-6
DS012720-7
Input Impedance
PSRR
DS012720-8
DS012720-9
5
www.national.com
CLC111
Electrical Characteristics
CLC111
Typical Performance Characteristics
(Continued)
Recommended RS vs. Load Capacitance
Gain vs. CL with Recommended RS
DS012720-11
DS012720-10
Small Signal Pulse Response
Large Signal Pulse Response
DS012720-12
Short-Term Settling Time
DS012720-13
Integral Linearity Error
DS012720-14
DS012720-15
www.national.com
6
(Continued)
Pulse Response
Typical D.C. Errors vs. Temperature
CLC111
Typical Performance Characteristics
DS012720-16
DS012720-17
Equivalent Input Noise
2nd and 3rd Harmonic Distortion
DS012720-18
DS012720-19
Bandwidth and ICC vs. VCC (Single Supply)
DS012720-20
7
www.national.com
CLC111
Printed Circuit Layout and Supply Bypassing
Application Division
As with any high frequency device, a good PCB layout is
required for optimum performance. This is especially
important for a device as fast as the CLC111.
Operation
the CLC111 is a low-power, very high speed unity gain buffer.
It uses a closed loop topology which allows for accuracy not
usually found in high speed open loop buffers. A slew
enhanced front end allows for low quiescent power while not
sacrificing AC performance.
Single Supply Operation
Although the CLC111 is specified to operate from split ± 5V
power supplies, there is no internal ground reference that
prevents operation from a single voltage power supply. For
single supply operation, the input signal should be biased at
a DC value of 1/2VCC. This can be accomplished by AC
coupling and rebiasing, as shown in Figure 1.
The above electrical specifications provide typical
performance specifications for the CLC111 at 25˚ C while
operating from a single +3V or a single +5V power supply.
To minimize capacitive feedthrough, pins 2, 3, 6, and 7
should be connected to the ground plane, as shown in
Figure 1. Input and output traces should be laid out as
transmission lines with the appropriate termination resistors
very near the CLC111. On a 0.065 inch epoxy PCB material,
a 50 transmission line (commonly called stripline) can be
constructed by using a trace width of 0.01” over a complete
ground plane.
Figure 1 shows recommended power supply bypassing.
The ferrite beads are optional and are recommended only
where additional isolation is needed from high frequency
( > 400MHz) resonances in the power supply.
DS012720-21
FIGURE 1. Recommended Circuit & Evaluation Board Schematic
spirally-trimmed RN55D metal file resistors will work, though
they will cause a slight degradation of AC performance due
to their reactive nature at high frequencies.
Evaluation Boards
Evaluation boards are available from National as part
numbers CLC730012 (DIP) and CLC730045 (SOIC). This
board was used in the characterization of the device and
provides optimal performance. Designers are encouraged to
copy these printed circuit board layouts for their applications.
Parasitic or load capacitance directly on the output of the
CLC111 will introduce additional phase shift in the device.
This phase shift can decrease phase margin and increase
frequency response peaking. A small series resistor before
the capacitance effectively decouples this effect. The graphs
in this data sheet illustrate the required resistor value and the
resulting performance vs. capacitance.
Precision buffed resistors (PRP8351 series from Precision
Resistive Products), which have low parasitic reactances,
were used to develop the data sheet specifications.
Precision carbon composition resistors or standard
www.national.com
8
CLC111
Physical Dimensions
inches (millimeters) unless otherwise noted
8-Pin SOIC
NS Package Number M08A
9
www.national.com
CLC111 Ultra High Slew Rate, Closed Loop Buffer
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
8-Pin MDIP
NS Package Number N08E
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]c.com
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.