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參數(shù)資料
| 型號(hào)： | RF2424 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | UHF QUADRATURE MODULATOR |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 89K |
| 代理商： | RF2424 |
5-45
RF2424
Rev A6 010817
5
M
U
Pin
1
Function
I REF
Description
Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. A voltage of 1.6V is recom-
mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable. If swapping the
I SIG and I REF pins, the Q SIG and Q REF also need to be swapped
to maintain the correct phase. It is also possible to drive the SIG and
REF inputs in a balanced mode. If single ended operation is desired
then the input is applied to I SIG, pin 16. In that case, I REF and Q REF
are tied together and AC coupled to ground. To obtain a carrier sup-
pression of better than 40dB, I REF may be tuned ±20mV relative to
the I SIG. Without tuning, it will typically be better than 25dB.
Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin. A voltage of 1.6V is recom-
mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable. If swapping the
Q SIG and Q REF pins, the I SIG and I REF also need to be swapped
to maintain the correct phase. It is also possible to drive the SIG and
REF inputs in a balanced mode. If single ended operation is desired
then the input is applied to Q SIG, pin 15. In that case, Q REF and Q
REF are tied together and AC coupled to ground. To obtain a carrier
suppression of better than 40dB, Q REF may be tuned ±20mV relative
to the Q SIG. Without tuning, it will typically be better than 25dB.
Power supply for the I mixer, Q mixer and the RF Output amplifier.
Interface Schematic
2
Q REF
3
4
VCC1
MIX OUT
MIXOUT: Combined output of the I mixer and Q mixer. By changing the
inductor value, maximum RF output is tuned to different frequency. If
the inductor value is changed, the RF output match needs to be
adjusted for 50
output impedance.
5
6
7
GND1
GND1
LO IN
Ground connection for the LO and baseband amplifiers and mixers.
Same as pin 5.
The input of the phase shifting network.
8
9
GND3
RF OUT
Ground connection for the LO phase shift network.
RF Output. An external LC matching network is needed for a 50
match.
10
11
12
GND2
GND1
PD
Ground connection for the RF output stage.
Same as pin 5.
Power Down control. When this pin is “l(fā)ow”, all circuits are shut off.
13
14
15
VCC2
GND1
Q SIG
Power supply for all circuits except mixers and output amplifier.
Same as pin 5.
Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.
Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.
See pin 2.
16
I SIG
See pin 1.
Q REF
Q SIG
BIAS
BIAS
Q REF
Q SIG
BIAS
BIAS
MIX OUT
LO
BIAS
RF OUT
PD
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