AD6432AST datasheet(17/20 Pages) AD

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AD6432

–17–

REV. 0

Table II. Connector Signal Description

Name

Description

GND

Analog and Power Ground.

ITXP

I Channel Transmit Plus Modulation Input.

ITXN

I Channel Transmit Minus Modulation Input.

QTXP

Q Channel Transmit Plus Modulation Input.

QTXN

Q Channel Transmit Minus Input.

TXPU

Transmit Section Power-Up. This function is

also jumper selectable with J21.

PCAM

Auxiliary Op Amp Minus Input.

PCAP

Auxiliary Op Amp Plus Input.

VS2

Power control op amp supply 2.7 V dc–3.6 V dc.

The jumper, J26, connects VS1 and VS2 together.

VS1

AD6432 main supply 2.7 V dc–3.6 V dc.

PCAO

Auxiliary Op Amp Output.

IFS0

Selects IF Pin. This function is also jumper pro-

grammable with J25.

IRXP

I Channel Receive Plus Modulation Output.

IRXN

I Channel Receive Minus Modulation Output.

QRXP

Q Channel Receive Plus Modulation Output.

QRXN

Q Channel Receive Plus Modulation Output.

GREF

The AD6432 gain reference bias which is optimized

for 1.2 V dc. This may be externally supplied; or by

shorting J23, supplied directly from the AD1580

SOT-23 onboard, 1.2 V reference.

GAIN

Max RX gain occurs at 0.2 V dc. Minimum gain

occurs at 2.4 V dc.

RXPU

Receive Section Power-Up. This function is also

jumper selectable with J22.

Power Requirements

The evaluation board uses two supplies, VS1 and VS2.

VS1—2.7 V dc–3.6 V dc, 13 mA typical. This is the main sup-

ply for the AD6432.

VS2—2.7 V dc–3.6 V dc, 2 mA typical. This is the supply for

the on-chip op amp which is normally used in RF power control

circuits.

The op amp is active only in the Transmit mode.

Table III. SMA End-Launch Connectors

SMA

Connector Description

MODO

Transmit Modulator Output. This pin, which is

designed to drive a 150

Ω filter, has been resistively

matched (loss) onboard to drive a 50

Ω instrument

such as a spectrum analyzer.

LOIP

Local Oscillator Input pin. This is actually fed with

twice the LO frequency from a generator for both

transmit and receive. The nominal LO level is

–16 dBm (50

Ω).

OPTLO

Optional differential minus local oscillator input

(transformer can be removed).

RFHI

RF input

MXOP

Mixer Output (optional output that may be converted

to single ended output with an RF transformer).

IFHI

IF Input (optional single ended input that may be

converted to differential with an RF transformer).

FREF

Frequency Reference for phase locked receive de-

modulator. The internal VCO frequency is equal to

FREF in the 1X mode and equal to two times FREF

in the 2X mode.

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