www.cadeka.com
KH561
Wideband, Low Distortion Driver Amplifier
Features
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General Description
The KH561 is a wideband DC coupled, amplifier that
combines high output drive and low distortion. At
an output of +24dBm (10V
pp
into 50Ω), the -3dB
bandwidth is 150MHz. As illustrated in the table
below, distortion performance remains excellent
even when amplifying high-frequency signals to high
output power levels.
With the output current internally limited to 250mA,
the KH561 is fully protected against shorts to ground
and can, with the addition of a series limiting resistor
at the output, withstand shorts to the ±15V supplies.
The KH561 has been designed for maximum flexibility
in a wide variety of demanding applications. The
two resistors comprising the feedback network set
both the gain and the output impedance, without
requiring the series backmatch resistor needed by most
op amps. This allows driving into a matched load
without dropping half the voltage swing through a
series matching resistor. External compensation allows
user adjustment of the frequency response. The
KH561 is specified for both maximally flat frequency
response and 0% pulse overshoot compensations.
The combination of wide bandwidth, high output
power, and low distortion, coupled with gain, output
impedance and frequency response flexibility, makes
the KH561 ideal for waveform generator applications.
Excellent stability driving capacitive loads yields
superior performance driving ADC’s, long transmission
lines, and SAW devices. A companion part, the
KH560, offers superior pulse fidelity for high accuracy
DC coupled applications.
The KH561 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
KH561AI
KH561AK
-25°C to +85°C
-55°C to +125°C
24-pin Ceramic DIP
24-pin Ceramic DIP,
features burn-in
and hermetic testing
24-pin Ceramic DIP,
environmentally screened
and electronically tested
to MIL-STD-883
150MHz bandwidth at +24dBm output
Low distortion
(2nd/3rd: -59/-62dBc @ 20MHz and 10dBm)
Output short circuit protection
User-definable output impedance, gain,
and compensation
Internal current limiting
Direct replacement for CLC561
Applications
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Output amplification
Arbitrary waveform generation
ATE systems
Cable/line driving
Function generators
SAW drivers
Flash A/D driving and testing
Frequency Response vs. Output Power
16
14
P
o
= 10dBm
V
o
= 2V
pp
Gain (dB)
12
10
8
6
0
P
o
= 24dBm
V
o
= 10V
pp
P
o
= 27.5dBm
V
o
= 15V
pp
P
o
= 18dBm
V
o
= 5V
pp
40
80
120
160
200
Frequency (MHz)
5
4
+V
CC
Compensation
V
o
V+
8
+
-
19
23
V-
18
5
21
10
15
20
-V
CC
All undesignated
pins are internally
unconnected. May
be grounded if
desired.
K
Typical Distortion Performance
KH561AM
100MHz
2nd
3rd
-35
-30
-40
-49
-36
-30
-55°C to +125°C
Output
Power
10dBm
18dBm
24dBm
20MHz
2nd
3rd
-59
-52
-50
-62
-48
-41
50MHz
2nd
3rd
-52
-45
-36
-60
-46
-32
REV. 1A January 2004
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
