Analog Devices AD6122 Manual page 17

Table III describes the high frequency signal connectors on the
AD6122 customer sample boards.
Table III. Evaluation Board SMA Signal Connector
Description
Connector Description
I Modulator Input. 250 mV p-p into 50 Ω
I CH
termination, dc coupled. The level shifting and
phase splitting is done on board by the AD830
amplifiers.
Q Modulator Input. 250 mV p-p into 50 Ω
Q CH
termination, ac coupled. The level shifting and
phase splitting is done on board by the AD830
amplifiers.
MODOP Modulator Output. The differential-to-single
ended conversion is performed by a balun on
the board. Impedance matched to 50 Ω for
130.38 MHz IF frequency.
IFIP IF Amplifier Input. Single-ended-to-differential
conversion performed by a balun on board.
Impedance matched to 50 Ω for 130.38 MHz IF
frequency.
TXOP IF Amplifier Output. Differential-to-single-
ended conversion performed by a balun on
board. Impedance matched to 50 Ω for 130.38
MHz IF frequency.
Local oscillator positive input at 2 × IF
LOIPP
frequency.
REV. B
Table IV lists the connections for the 20-pin power-supply
connector.
Table IV. 20-Pin Power Supply Connection Information
Pin # Function
1 VPOS for AD6122; 2.9 V to 4.2 V using regulator; 2.7 V
to 4.2 V bypassing regulator.
2 VPOS for AD6122; 2.9 V to 4.2 V using regulator; 2.7 V
to 3.6 V bypassing regulator.
3 Ground.
4 Ground.
5 Ground.
6 Regulated Output or Input Voltage; Connects to Pin 5
on AD6122.
7 Ground.
8 Ground.
9 Ground.
10 Ground.
11 Ground.
12 PD1; Power-Down 1 Input.
13 Ground.
14 1.23 V Reference Voltage from AD6122.
15 Ground.
16 VGAIN; Gain Control Voltage Input.
17 –15 V Supply for AD830 Differential Amplifier.
18 +15 V Supply for AD830 Differential Amplifier.
19 MODCMREF; common-mode reference output for
baseband converter common-mode reference input.
20 PD2; Power-Down 2 Input.
A schematic diagram of the evaluation board is on the next two
pages.
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AD6122