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AD8348
APPLICATIONS
BASIC CONNECTIONS
Figure 49 shows the basic connections schematic for the AD8348.
LO
4
5
ETC1-1-13
J21
LO
4 5
T21
ETC1-1-13
1000pF
3 1
60.4 ?
1000pF
3 1
C21
1000pF
R21
60.4 ?
C22
1000pF
1 LOIP
LOIN 28
AD8348
1 LOIP
LOIN 28
+V S
C52
C51
2 VPOS1 COM1 27
Figure 50. Differential LO Drive with Balun
J3I
IOPN
J2I
IOPP
IFIP
0.1μF 100pF
C32
1000pF
R31 R32
57.6 ? 174 ?
V REF
3 IOPN QOPN 26
4 IOPP QOPP 25
5 VCMO ENVG 24
6 IAIN QAIN 23
7 COM3 COM3 22
8 IMXO QMXO 21
9 COM2 VPOS3 20
10 IFIN MXIN 19
11 IFIP MXIP 18
C55
100pF
C41
1μF
C56
0.1μF
IF
+V S
SW12
MX
+V S
C43
1000pF
T41
ETK4-2T
R42
0 ?
J3Q
QOPN
J2Q
QOPP
MXIP
Alternatively, the LO port can be driven from a single-ended source
without a balun (Figure 51). The LO signal is ac-coupled directly
into the LOIP pin via an ac-coupling capacitor, and the LOIN pin
is ac-coupled to ground. Driving the LO port from a single-
ended source results in an increase in both quadrature phase
error and LO leakage.
LO
+V S
C54
0.1μF
C31
1000pF
C53
100pF
C0l
0.1μF
C11
12 VPOS2
13 IOFS
14 VREF
VGIN 17
QOFS 16
ENBL 15
C0Q
0.1μF
VGIN
C42
1000pF
ENBL
+V S
SW11
1000pF
1
LOIP
60.4 ?
1000pF
LOIN 28
4.7μF
DENBL
Figure 49. Basic Connections Schematic
Figure 51. Single-Ended LO Drive
POWER SUPPLY
The voltage supply for the AD8348, between 2.7 V and 5 V, should
be provided to the +VPOSx pins, and ground should be connected
to the COMx pins. Each supply pin should be decoupled separately
using two capacitors whose recommended values are 100 pF and
0.1 μF (values close to these can also be used).
DEVICE ENABLE
To enable the device, the ENBL pin should be driven to V S .
Grounding the ENBL pin disables the device.
VGA ENABLE
Driving the voltage on the ENVG pin to V S enables the VGA. In
The recommended LO drive level is between ?12 dBm and
0 dBm. The LO frequency at the input to the device should be
twice that of the desired LO frequency at the mixer core. The
applied LO frequency range is between 100 MHz and 2 GHz.
IF INPUTS
The IF inputs have an input impedance of 200 Ω. A broadband
50 Ω match can be presented to the driving source through the use
of a minimum-loss L pad. This minimum-loss pad introduces
an 11.46 dB loss in the input path and must be taken into account
when calculating metrics such as gain and noise figure. Figure 42
shows the S11 of the IF input with and without the L pad.
this mode, the MX inputs are disabled and the IF inputs are
used. Grounding the ENVG pin disables the VGA and the IF
1000pF
10
IFIN
inputs. When the VGA is disabled, the MX inputs should be used.
GAIN CONTROL
IFIP
57.6 ?
174 ?
1000pF
11
IFIP
When the VGA is enabled, the voltage applied to the VGIN pin sets
the gain. The gain control voltage range is between 0.2 V and 1.2 V.
This corresponds to a gain range between +25.5 dB and ?18.5 dB.
LO INPUTS
For optimum performance, the local oscillator port should be
driven differentially through a balun. The recommended balun
Figure 52. Minimum-Loss L Pad for 50 Ω IF Input
MX INPUTS
The mixer inputs, MXIP and MXIN, have a nominal impedance
of 200 Ω and should be driven differentially. When driven from
a differential source, the input should be ac-coupled to the
source via capacitors, as shown in Figure 53.
is M/A-COM ETC1-1-13. The LO inputs to the device should
be ac-coupled, unless an ac-coupled transformer is being used.
For a broadband match to a 50 Ω source, a 60.4 Ω resistor
should be placed between the LOIP and LION pins.
Rev. A | Page 20 of 28
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