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PDF KH563 Data sheet ( Hoja de datos )
| Número de pieza | KH563 | |
| Descripción | Low Distortion Driver Amplifier | |
| Fabricantes | Cadeka | |
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Amplify the Human Experience
KH563
Wideband, Low Distortion Driver Amplifier
www.datasheet4u.com
www.cadeka.com
Features
s 150MHz bandwidth at +24dBm output
s Low distortion
(2nd/3rd: -59/-62dBc @ 20MHz and 10dBm)
s Output short circuit protection
s User-definable output impedance, gain,
and compensation
s Internal current limiting
Applications
s Output amplification
s Arbitrary waveform generation
s ATE systems
s Cable/line driving
s Function generators
s SAW drivers
s Flash A/D driving and testing
Frequency Response vs. Output Power
16
Po = 10dBm
14 Vo = 2Vpp
12 Po = 24dBm
Vo = 10Vpp
10 Po = 27.5dBm
Vo = 15Vpp
8
Po = 18dBm
Vo = 5Vpp
6
0 40 80 120 160
Frequency (MHz)
200
V+ 8
+
V- 18
5
10
15
20
-
4 +VCC
19 Compensation
23 Vo
21 -VCC
General Description
The KH563 is a wideband DC coupled, amplifier that
combines high output drive and low distortion. At
an output of +24dBm (10Vpp 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 KH563 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 KH563 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
KH563 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 KH563 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 KH563 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
KH563AI -25°C to +85°C 24-pin Ceramic DIP
Typical Distortion Performance
Output
Power
10dBm
18dBm
24dBm
20MHz
2nd 3rd
-59 -62
-52 -48
-50 -41
50MHz
2nd 3rd
-52 -60
-45 -46
-36 -32
100MHz
2nd 3rd
-35 -49
-30 -36
-40 -30
REV. 1A January 2008
1 page  
KH563
DATA SHEET
KH563 Typical Performance Characteristics (TA = +25°C, Circuit in Figure 1; unless specified)
Small Signal Pulse Response
Maximally Flat
1.2 Compensation
0.8
0% Overshoot
0.4 Compensation
www.datasheet40 u.com
-0.4
-0.8
-1.2
Large Signal Pulse Response
Maximally Flat
6 Compensation
4
0% Overshoot
2 Compensation
0
-2
-4
-6
Uni-Polar Pulse Response
6
Maximally Flat
Compensation
4
2
0
-2
-4
-6
Time (2ns/div)
Time (5ns/div)
Time (5ns/div)
Settling Time into 50Ω Load
561 Plot16
2.0
5V Output Step
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
10-9 10-7 10-5 10-3 10-1 101
Time (sec)
Settling Time into 50pF Load
2.0
561 Plot19
5V Output Step
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
10-9 10-7 10-5 10-3 10-1 101
Time (sec)
Settling Time into 500Ω Load 561 Plot17
2.0
5V Output Step
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
10-9 10-7 10-5 10-3 10-1 101
Time (sec)
Output Return Loss (S22)
0
-5 Ro = 50Ω
-10 Rx = 0Ω
-15
-20
-25
-30
-35
-40
-45 Re-compensated
at each Rx
-50
0 50 100
150
Frequency (MHz)
561 Plot20
Ro = 40Ω
Rx = 10Ω
200 250
Reverse Transmission Gain & Phase5(6S112)Plot18
0
-20
-40
-60 Gain
-80
-100 Phase
0
-45
-90
-135
-180
0 50 100 150 200 250
Frequency (MHz)
Input Return Loss (S11)
0
-10
-20
-30 Magnitude
-40
-50
Phase
Re-compensated
at each Rx
561 Plot22
0
-45
-90
-135
-180
0 50 100 150 200 250
Frequency (MHz)
-1dB Compensation Point
34
561 Plot21
33
32
31 Ro = 50Ω
30 Ro = 75Ω
29
28
27
26
25 Match Load
Re-compensated at each load
24
0 20 40 60
80 100
Frequency (MHz)
Group Delay
4.0
561 Plot25
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2 Aperture set to 5%
of span (12.8MHz)
2.0
0 50 100 150 200 250
Frequency (MHz)
Noise Figure
22
561 Plot24
21
20
19 Ro = 100Ω
18 Ro = 75Ω
17 Ro = 50Ω
16
15
14
13
12
5
Ro = 25Ω
10
Non-inverting input impedance
matched to source impedance
15 20 25 30
No Load Gain
5 Gain Error Band (Worst Case, DC)561 Plot26
4
Ro (nominal) = 50Ω
RL = 50Ω ± 0%
3
2
1
0
Rf and Rg
tolerance = ±0.1%
-1
-2
-3
-4
-5
5
Rf and Rg
tolerance = ±1%
9 13 17 21 25
No Load Gain
Equivalent Input Noise
100
561 Plot23
100
60 60
40 Inverting Current 34pA/√Hz 40
20 20
10
6
4
2
1
100
1k
PSRR
100
90
80
70
60
50
40
30
20
10
0
100
1k
Non-Inverting Current 2.8pA/√Hz
10
6
4
2
Non-Inverting Voltage 2.1nV/√Hz
1
10k 100k 1M 10M 100M
Frequency (Hz)
561 Plot27
10k 100k 1M
Frequency (Hz)
10M 100M
561 Plot28
561 Plot29
561 Plot30
REV. 1A January 2008
5
5 Page 
KH563
DATA SHEET
For the circuit of Figure 1, the equivalent input noise
voltage may be calculated using the data sheet spot
noises and Rs = 25Ω, RL = ∞. Recall that 4kT = 16E-21J.
All terms cast as (nV/√Hz)2
en = (2.1)2 + (.07)2 + (.632)2 + (1.22)2 + (.759)2 + (.089)2
www.datash=ee2t.46u2.cnoVm/ Hz
Gain Accuracy (DC):
A classical op amp’s gain accuracy is principally set by
the accuracy of the external resistors. The KH563
also depends on the internal characteristics of the
forward current gain and inverting input impedance. The
performance equations for Av and Ro along with the
Thevinin model of Figure 5 are the most direct way of
assessing the absolute gain accuracy. Note that internal
temperature drifts will decrease the absolute gain
slightly as the part warms up. Also note that the para-
meter tolerances affect both the signal gain and output
impedance. The gain tolerance to the load must include
both of these effects as well as any variation in the load.
The impact of each parameter shown in the performance
equations on the gain to the load (AL) is shown below.
Increasing current gain G
Increasing inverting input Ri
Increasing Rf
Increasing Rg
Increases AL
Decreases AL
lncreases AL
Decreases AL
Applications Suggestions
Driving a Capacitive Load:
The KH563 is particularly suitable for driving a capacitive
load. Unlike a classical op amp (with an inductive output
impedance), the KH563’s output impedance, while
starting out real at the programmed value, goes some-
what capacitive at higher frequencies. This yields a very
stable performance driving a capacitive load. The overall
response is limited by the (1/RC) bandwidth set by the
KH563’s output impedance and the load capacitance. It
is therefore advantageous to set a low Ro with the
constraint that extremely low Rf values will degrade the
distortion performance. Ro = 25Ω was selected for the
data sheet plots. Note from distortion plots into a
capacitive load that the KH563 achieves better than
60dBc THD (10-bits) driving 2Vpp into a 50pF load
through 30MHz.
Improving the Output Impedance Match
vs. Frequency - Using Rx:
Using the loop gain to provide a non-zero output
impedance provides a very good impedance match at
low frequencies. As shown on the Output Return Loss
plot, however, this match degrades at higher frequencies.
Adding a small external resistor in series with the output,
Rx, as part of the output impedance (and adjusting the
programmed Ro accordingly) provides a much better
match over frequency. Figure 9 shows this approach.
Vi
Rs
+ Cx
KH563
-
Rf
R'o = Rx + Ro
Rx
Vo
RRo L= R'o - Rx
Rg With:
Ro = KH563 output impedance
and Ro + Rx = RL generally
Case Temperature
Figure 9: Improving OTuctput Impedance
20∞C/W
M20a0t∞cCh/Wvs. Frequenθccya
Case to Ambient
Termal Impedance
IncrTej(at)sing Rx willTdj(eq)crease the achievableTAvoltage swing
at tPhte load. A mPinq imum
with the desired output
mRxatschhPo.cuircludAit sbediusATscemeumdsbpsieecenrodatntusirniesttehnet
thermal analysis discussion, Rx is also very useful in
limiting the internal power under an output shorted
condition.
KH563 Fig 9
Interpreting the Slew Rate:
The slew rate shown in the data sheet applies to the volt-
age swing at the load for the circuit of Figure 1. Twice this
value would be required of a low output impedance
amplifier using an external matching resistor to achieve
the same slew rate at the load.
Layout Suggestions:
The fastest fine scale pulse response settling requires
careful attention to the power supply decoupling.
Generally, the larger electrolytic capacitor ground
connections should be as near the load ground (or cable
shield connection) as is reasonable, while the higher
frequency ceramic de-coupling caps should be as near
the KH563’s supply pins as possible to a low inductance
ground plane.
Evaluation Boards:
An evaluation board (showing a good high frequency lay-
out) for the KH563 is available. This board may be
ordered as part #730019.
Thermal Analysis and Protection
A thermal analysis of a chip and wire hybrid is
directed at determining the maximum junction
temperature of all the internal transistors. From the total
internal power dissipation, a case temperature may be
developed using the ambient temperature and the case
to ambient thermal impedance. Then, each of the
dominant power dissipating paths are considered to
determine which has the maximum rise above case
temperature.
The thermal model and analysis steps are shown below.
As is typical, the model is cast as an electrical model
where the temperatures are voltages, the power dissipa-
tors are current sources, and the thermal impedances
are resistances. Refer to the summary design equations
and Figure 1 for a description of terms.
REV. 1A January 2008
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet KH563.PDF ] | |
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