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PDF SL3522 Data sheet ( Hoja de datos )
| Número de pieza | SL3522 | |
| Descripción | 500MHz 75dB Logarithmic/Limiting Amplifier | |
| Fabricantes | Mitel Networks Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SL3522 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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SL3522
500MHz 75dB Logarithmic/Limiting Amplifier
Advance Information
Supersedes edition in Professional Products IC Handbook May 1991
DS3534 - 2.0 April 1994
The SL3522 is a monolithic seven stage successive
detection logarithmic amplifier integrated circuit for use in the
100MHz to 500MHz frequency range. It features an on–chip
video amplifier with provision for external adjustment of log
Slope and offset. It also features a balanced RF output. The
SL3522 operates from supplies of ±5V.
FEATURES
s 75dB Dynamic Range
s Surface Mount SO Package
s Adjustable Log Slope and Offset
s 0dBm RF Limiting Output
s 60dBm Limiting Range
s 2V Video Output Range
s Low Power (Typ. 1W)
s
Temperature
Range
(T ):
CASE
-55°C
to
+125°C
APPLICATIONS
s Ultra Wideband Log Receivers
s Channelised and Monpulse Radar
s Instrumentation
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
Storage temperature
Junction temperature
Thermal resistance
Die-to-case
Die-to-ambient
Applied DC voltage to RF input
Applied RF power to RF input
±6.0V
-65°C to +175°C
+175°C
15.5°C/W
76.5°C/W
±400mV
+15dBm
N/C
N/C
VEE
GND
VEE
GND
VEE
RF O/P GND
RF O/P–
RF O/P+
RF O/P VEE
VIDEO O/P VEE
VIDEO O/P
VIDEO O/P VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 RF I/P+
27 RF I/P–
26 VEE
25 GND
24 VEE
23 GND
22 VEE
21 GND
20 VIDEO VEE
19 GAIN ADJUST
18 TRIM REF
17 OFFSET ADJ
16 VIDEO GND
15 VIDEO VCC
Fig.1 Pin connections - top view
MC28
ORDERING INFORMATION
SL3522 A MC (Miniature Ceramic package)
SL3522 C MC (Miniature Ceramic package)
SL3522 NA 1C (Probe-tested bare die)
(Also available: SL3522 AA MC screened to Mitel HI-REL
level A. Contact Mitel Semiconductor sales outlet for a
separate datasheet.)
ESD PROTECTION
To achieve the high frequency performance there are no
ESD protection structures on the RF input pins (27, 28). These
pins are highly static sensitive, typically measured as 250V
using MIL-STD-883 method 3015. Therefore, ESD handling
precautions are essential to avoid degradation of
performance or permanent damage to this device.
RF 27
I/P –
RF
I/P + 28
3, 5, 7, 20, 22, 24, 26 VEE
4, 6, 8, 21, 23, 25 GND
RF RF O/P
O/P– O/P+ VCC
9 10 14
VIDEO GAIN
AND OFFSET
ADJUST
O/P
GND
16
VIDEO
13 OUT
O/P
12 VEE
VIDEO
15 VCC
19 18 17
GAIN
ADJ
OFFSET
RG RT RO ADJ
Fig.2 Functional block diagram
1 page  
SL3522
APPLICATION NOTES
1) VIDEO–AMPLIFIER
The SL3522 uses a single ended Video amplifier to
produce a trimmable Video transfer characteristic. Both the
gain (Slope) and Offset of the amplifier can be externally
adjusted.
a) Gain and Offset trimming (ref Applications
circuits in figs 5 and 6)
The Gain and Offset control is achieved by adjusting RG
and RO respectively. The control is dependent upon their
difference from the Trim reference resistor, RT. Adjustment of
Gain has an effect on Offset, but adjustment of Offset does
NOT affect the Gain. Therefore the Gain should be optimised
first. The Offset should only be adjusted once the Gain has
been set.
Fig 7 shows the variation of Video Offset with value of RO,
for a fixed value of RT and RG = 1k5Ω.
Fig 8 shows the variation of Video Slope with value of RG,
for a fixed value of RT and RO = 1k5Ω.
The Video amplifier incorporates temperature
compensation for Video gain (Slope). To ensure temperature
stability for Video gain (Slope) over the operating temperature
range, it is recommended that the resistors with identical
temperature coefficients of resistance are used for RT and RG.
The Video amplifier does NOT incorporate temperature
compensation for Video Offset. Although it is recommended
that a resistor with identical temperature coefficient of
resistance to RT be used for RO, it may be necessary to use an
additional external temperature compensating network.
b) Video performance
The Video–amplifier has a critically damped rise time of
16ns (10% - 90%).In order to achieve this transient
performance, it is important to ensure that:-
i) the resistor connected to Trim reference (pin 18), has a
nominal resistance of 1.5kΩ, with a parasitic capacitance
LESS than 5pF.
ii) the load applied to the Video Output (pin 13) does NOT
exceed 200Ω resistance in parallel with 20pF.
Also, the following decoupling should be incorporated:-
i) The Video Output VCC (pin 14) should be decoupled with
a 10nF capacitor to the RETURN line from the video load,
connected to Video GND (pin 16), avoiding any common
impedance path.
ii) The Video Output Vee (pin 12) should be decoupled
with a 10nF capacitor DIRECTLY to Video-Output VCC (pin
14).
2) SL3522 AS A LOG AMPLIFIER
with RF output buffer disabled (pin 8 floating)
If the SL3522 is to be used as a Logarithmic successive
detection amplifier only, with no requirement for a limited RF
Output, the RF input (pins 27 and 28) can be driven EITHER
differentially or single ended from a 50Ω source. If being used
with a single ended input, the SIGNAL should be applied to pin
27 and the RETURN should be connected to pin 28, as shown
in the Application circuit diagram in Fig 5.
The SL3522 is VERY stable when used in this way.
Although not a crucial requirement, it is recommended that the
device should be mounted using a ground plane.
3) SL3522 AS A LOG/LIMITING AMPLIFIER
- with RF Output-Buffer ENABLED (pin 8 connected
to GND)
If the SL3522 is to be used as a Limiting or Log/limiting
amplifier with a requirement for a Limited RF Output signal,care
is required in the layout of components and connections around
the device to ensure stability. The following precautions should
be observed (refer to Application circuit diagram in Fig. 6):-
a) The device should be mounted on a ground plane,
ensuring that the impedance between the ground plane and
ALL the GND pins is kept as low as possible. If a multilayer PCB
is used where the ground plane is connected to the GND pins
using through-plated holes (vias), it is essential to ensure that
the vias have a very low impedance. ALL supply decoupling
capacitors should be RF chip capacitors whose leads should be
kept as short as possible.
b) The RF VEE connections (pins 3,5,7,11,20,22,24,26)
should be connected to a low impedance copper plane. A two
layer PCB should help to achieve this.
c) The RF input (pins 27 and 28) should be driven with a
balanced source impedance. One way of achieving this is to
use an isolating BALUN transformer (50Ω UNBALANCED →
50Ω BALANCED) connected between the signal source and
the RF input pins. (e.g. Mini circuits TT1–6, TO –75). The device
stability is VERY sensitive to an imbalance of the differential
source impedance at pins 27 and 28. Use of a transmission line
BALUN though, is NOT recommended.
d) The RF Output connections (pins 9 and 10) should each
be loaded with matched impedances ideally 50Ω transmission
lines. The RF Output lines leading away from the device should
be balanced. Driving highly reactive SWR loads is NOT
recommended as these can encourage device instability, as
can an imbalance of the differential load impedance at pins 9
and 10.
e) The RF Output connections (pins 9 and 10) are DC
coupled, and ideally the output pins should be capacitively
coupled to their loads using 1nF capacitors. However the RF
Outputs can drive a DC load to GND and a DC offset of approx.
400mV will exist on each RF Output pin. IT WILL NOT BE
POSSIBLE TO DISABLE THE RF OUTPUT BUFFER UNDER
THESE CONDITIONS.
f) The RF output (pins 9 and 10) has a tendancy to limit on
self noise, particularly at low ambient temperatures (-55°C),
when the RF output buffer is enabled.
NOTE that this will effect the liminting range as the gain of the
RF output buffer will reduce as the amount of noise limiting
increases.
If required the limited RF Output can be attenuated using
an attenuation network as shown in fig. 9. Under these
conditions the effective RF Output currents will be reduced,
allowing the device to operate with a greater margin of
stability.It may be possible to run the device without a BALUN
transformer on the RF input if the total output impedance on the
RF Output >> 50Ω , and the attenuation components are
mounted as close as possible to the RF Output connections
(pins 9 and 10). The RF input connection could then be
configured as in Fig 5.
5
5 Page 
SL3522
7
6
5
4
4.5V
3
2
1
5.0V
0
–1
5.5V
–2
–3
–70 –60 –50 –40 –30 –20 –10 0 10
RF input power (dBm)
Fig.14 Video log error, (referenced to single straight line measured at 325MHz, 25°C, 5.0V PSUs), across supply voltage
6
5
500MHz
4
3
2
325MHz
1
0
–1
100MHz
–2
–3
–4
–70
–60 –50 –40 –30 –20 –10
RF input power (dBm)
0
Fig.15 Video log error, (referenced to single straight line measured at 325MHz, 25°C,
10
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SL3522.PDF ] | |
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