adl5386 Analog Devices, Inc., adl5386 Datasheet - Page 25

• Manufacturer Part Number: adl5386
• Description: 50 Mhz To 2200 Mhz Quadrature Modulator With Integrated Detector And Vva
• Manufacturer: Analog Devices, Inc.

USING THE DETECTOR IN STANDALONE
MEASUREMENT MODE
The on-board log detector of the ADL5386 can be used in
measurement mode, that is, where an RF signal is applied to the
INHI pin of the detector, and an output voltage, proportional to
the log of this input signal, is provided at the VDET output. In
this mode, short VDET to VSET and ac couple the ATTI, ATTO,
and ATTCM pins to ground. Note that the VVA cannot be used
because the VVA control voltage shares a common pin with the
output of the detector.
Table 5 summarizes the required configuration changes for the
three operating modes discussed.
Table 5. Configuring Operating Modes
Mode
AGC
Open
loop
Standalone
detector
1
Tie TADJ to VPOS.
1
QN
LO
QP
IP
IN
INHI
AC couple to ATTO
via directional coupler
AC couple to GND
AC couple to MODOUT
or other RF signal
1000pF
1000pF
C3
C4
QBBN
QBBP
IBBN
IBBP
LOIP
LOIN
VPOS
0.1µF
30
25
26
33
34
29
C1
38
TEMPERATURE
TEMP
+5V
VP
37
SENSOR
TEMP
QUADRATURE
8
36
VSET
Externally apply
0.5 V to 1.4 V
Open
Connect to VDET
SPLITTER
Figure 45. Connections for Operating the Detector in Standalone Mode
PHASE
35
C2
0.1µF
0.1µF
VPOS
INLO
49.9Ω
C5
R8
1
VPOS
0.1µF
DTIN
C14
2
23
INHI
C6
0.1µF
22
DETECTOR
VDET/VCTL
Open
Externally apply
0 V to 2 V
Connect to VSET
22.1kΩ
TADJ
21
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LOG
IQ MOD
R4
BIAS
24
39
C13
0.1µF
ENBL
ADL5386
5
11
MODOUT
13
DAC MODULATOR INTERFACING
The ADL5386 is designed to interface with minimal components
to members of the Analog Devices family of digital-to-analog
converters (DACs). These DACs feature an output current
swing from 0 mA to 20 mA, and the interface described in this
section can be used with any DAC that has a similar output.
15
VREF
Open
Externally
apply 2 V
Open
10
16 18
19 27
12
C31
ATTI
15dB
28
1000pF
ENBL
High
High
High
C20
4x
31
I
32
NC
1000pF
9
V
40
COMM
MODOUT
AC couple
to ATTI
AC couple
to ATTI
RF output,
ac-coupled
17
14
20
6
4
3
7
CLPF
VSET
0.1µF
ATTCM
ATTCM
ATTO
VREF
VDET/VCTL
C7
C11 1000pF
C10
C30
1000pF
1000pF
ATTI
AC couple to
MODOUT
AC couple to
MODOUT
AC couple
to GND
MOD OUT
VDET
ADL5386
ATTO
RF output
RF output
AC couple
to GND