lt5537 Linear Technology Corporation, lt5537 Datasheet - Page 11

• Manufacturer Part Number: lt5537
• Description: Wide Dynamic Range Rf/if Log Detector
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
Baseband Response
The unloaded bandwidth of the LT5537 output buffer is
10MHz. With 2.5pF loading, the output bandwidth is
approximately 6MHz. The baseband response of the LT5537
was characterized with a pulsed RF input using the setup
shown in Figure 8. The input to the LT5537 is a 200MHz
CW RF signal switched between –30dBm and –60dBm at
a rate of 600kHz. The output was connected to a FET probe
(Fluke PM8943A, 10:1 tip) which has a capacitive loading
of 2.5pF. The 10% to 90% rise and fall times are 109ns and
115ns, respectively. The input signal and output response
are shown in Figure 9.
U
J2
U
ATTENUATOR
GENERATOR
DIVIDER
AGILENT
POWER
E4436B
SIGNAL
–30dB
RF OUT
J1
W
J3
RF1
RF2
ZYSW-2-50DR
MINICIRCUIT
GENERATOR
HP33120A
FUNCTION
U
Figure 8. Timing Test Setup
SPDT
50Ω
OUT
SYNC
TTL
RF IN
ATTENUATOR
ATTENUATOR
–30dB
–6dB
Figure 9. Response Time (–30dBm to –60dBm)
TRIG
FET PROBE
PM8943A
LT5537
BOARD
DIGITAL COMMUNICATIONS
DEMO
10:1
ELECTRONIC PLUG-IN
J2
INPUT
OUTPUT
CH3
ANALYZER WITH
HP 83480A
HP 54751A
DIVIDER
POWER
J1
J3
5537 F14
CH4
LT5537
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