AD8347-EVAL Analog Devices Inc, AD8347-EVAL Datasheet - Page 25

• Manufacturer Part Number: AD8347-EVAL
• Description: BOARD EVAL FOR AD8347
• Manufacturer: Analog Devices Inc

Specifications of AD8347-EVAL

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 4. Evaluation Board Configuration Options
Component
TP1, TP4, TP5
TP2, TP6
TP3
LK1, J11
LK2, LK6, LK3, J9,
J10
LK4, LK5, J7, J8
R6, R33,
L1 to L5
C4, C17 to C22,
C25 to C31
R8, R34, R39, R40
R35, R36, R37, R38
SW1
Function
Power Supply and Ground Vector Pins.
IOFS and QOFS Probe Points.
VREF Probe Point.
Baseband Amplifier Output Bias. Installing this link connects VREF to VCMO setting
the bias level on the baseband amplifiers to VREF, which is equal to approximately
1 V. Alternatively, the bias level of the baseband amplifiers can be set by applying
an external voltage to SMA Connector J11.
AGC Mode. Installing LK2 and LK6 connects IMXO and QMXO, the mixer outputs, to
VDT2 and VDT1, the detector inputs. By installing LK3, which connects VGIN to
VAGC, the AGC mode is activated. The AGC voltage can be observed on SMA
Connector J9. With LK3 removed, apply the gain control signal for the internal
variable gain amplifiers to SMA Connector J10.
Baseband Filtering. Installing LK4 and LK5 connects IMXO and QMXO, the mixer
outputs, directly to IAIN and QAIN, the baseband amplifier inputs. With R6 and R33
installed (0 Ω), IAIN and QAIN can be observed on SMA Connector J7 and SMA
Connector J8. By removing LK4 and LK5 and installing R8 and R34, LC filters can be
inserted between the mixer outputs and the baseband amplifier inputs. R8 and R34
can be used to increase the effective output impedance of IMXO and QMXO (these
outputs have low output impedances). R39 and R40 can be used to provide
terminations for the filter at IAIN and QAIN (high impedance inputs.) Terminate R39
and R40 to VREF.
Baseband Amplifier Output Series Resistors.
Device Enable. When in Position A, the ENBL pin is connected to +V
AD8347 is in operating mode. In Position B, the ENBL pin is grounded, putting the
device in power-down mode.
Rev. A | Page 25 of 28
S
and the
Default Condition
Not applicable
Not applicable
Not applicable
LK1 installed
LK2, LK6, LK3 installed
LK4, LK5 installed
R6 = R33 = 0 Ω (Size 0603)
L1 to L5 = open (Size 0805), C4,
C17 to C22, C25 to C31 = open
(Size 0805), R8 = R34 = open
(Size 0603), R39 = R40 = open
(Size 0603)
R35 = R36 = R37 = R38 = 0 Ω
(Size 0603)
SW1 = A
AD8347