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RF2942PCBA

UHF QUADRATURE MODULATOR AND TRANSMITTER

RF Micro Devices 

RF2942

Pin Function Description

Interface Schematic

1

QSIG-

Reference voltage for the I and Q mixer. This voltage should be the

same as the DC voltage supplied to the I and Q SIG pin. To obtain a DATA+

carrier suppression of better than 40dB it may be tuned ±0.15V (rela-

tive to the I and Q SIG DC voltage). Without tuning, the carrier suppres-

sion will typically be better than 25dB. The input impedance of this pin

is typically >10 kΩ.

DATA

BIAS

2

QSIG+

Same as pin 1, except complementary input.

See pin 1.

3

ISIG-

Same as pin 4, except complementary input.

See pin 1.

4

ISIG+

This pin is used to supply Vcc to the modulator circuits. A RF bypass See pin 1.

capacitor should be connected directly to this and ground. Baseband

input to the I mixer. A DC bias of approximately 1.2V is present at this

pin.A DC blocking capacitor is needed if the signal has a different DC

level. Maximum output power is obtained when the input signal has a

peak to peak amplitude of 1V. The input impedance of this pin is about

3 kΩ. The SIG- and SIG+ inputs are interchangeable. If swapping the I

SIG+ and I SIG- pins, the Q SIG+ and Q SIG- also need to be swapped

to maintain the correct phase. The SIG+ and SIG- pins may be driven

differentially for BPSK to increase conversion gain.

5

N/C

No connection.

6

GND

7

PA VCC Voltage supply for PA driver.

8

N/C

No connection.

9

RF OUT Power Amp output, open collector output.

VCC3 RF OUT

10

N/C

No connection.

11

VCC3

Voltage supply for PA buffer.

12

TX EN

TX enabled when >2.0V. When TX EN is held low, only the LO buffer,

LO divider and LO divider buffer are left on. To power all of the circuitry

down, TX EN and VCC1 must be held low.

13

VCC1

Voltage supply for LO buffer and divider.

14

LO IN

The LO input level should be greater than -15dBm for proper operation.

LO IN+

LO IN-

BIAS

15

LO/2 OUT LO divide-by-2 output.

16

VCC2

Voltage supply for mixers.

Rev A4 040115

11-197

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