11-197
RF2942
Rev A4 040115
Pin
Function
Description
Interface Schematic
1QSIG-
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
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 k
Ω.
2QSIG+
Same as pin 1, except complementary input.
See pin 1.
3ISIG-
Same as pin 4, except complementary input.
See pin 1.
4ISIG+
This pin is used to supply Vcc to the modulator circuits. A RF bypass
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 k
Ω. 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.
See pin 1.
5N/C
No connection.
6GND
7PA VCC
Voltage supply for PA driver.
8N/C
No connection.
9RF OUT
Power Amp output, open collector output.
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.
15
LO/2 OUT
LO divide-by-2 output.
16
VCC2
Voltage supply for mixers.
DATA
DATA+
BIAS
VCC3 RF OUT
BIAS
LO IN-
LO IN+
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