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參數(shù)資料
| 型號： | MAX2450 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 衰減器 |
| 英文描述： | 3V, Ultra-Low-Power Quadrature Modulator/Demodulator |
| 中文描述： | RF/MICROWAVE I/Q MODEM |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 107K |
| 代理商： | MAX2450 |
M
3V, Ultra-Low-Power Quadrature
Modulator/Demodulator
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
_____________________Maxim Integrated Produc ts, 120 S an Gabriel Drive, S unnyvale, CA 94086 408-737-7600
1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
pression. Alternatively, a differential DAC may be con-
nected without AC coupling, as long as a common-
mode voltage range of 1.25V to 1.75V is maintained.
For single-ended drive, connect
I_IN
and
Q_IN
via AC-
coupling capacitors (0.1μF) to GND.
The IF output is designed to drive a high impedance
(> 20k
), such as an IF buffer or an upconverter
mixer. IF_OUT/
IF_OUT
must be AC coupled to the
load. Impedances as low as 200
can be driven with a
decrease in output amplitude (Figure 3). To drive a sin-
gle-ended load, AC couple and terminate
IF_OUT
with
a resistive load equal to the load at IF_OUT.
Master Bias
During normal operation, ENABLE should remain above
V
CC
- 0.4V. Pulling the ENABLE input low shuts off the
master bias and reduces the circuit current to less than
2μA. The master bias section includes a bandgap ref-
erence generator and a PTAT (Proportional To Absolute
Temperature) current generator.
__________Applic ations Information
Figure 4 shows the implementation of a resonant tank
circuit. The inductor, two capacitors, and a dual varac-
tor form the oscillator’s resonant circuit. In Figure 4, the
oscillator frequency ranges from 130MHz to 160MHz.
To ensure reliable start-up, the inductor is directly con-
nected across the local oscillator’s tank ports. The two
33pF capacitors affect the Q of the resonant circuit.
Other values may be chosen to meet individual appli-
cation requirements. Use the following formula to deter-
mine the oscillation frequency:
where C
STRAY
= parasitic capacitance and L
STRAY
=
parasitic inductance.
To alter the oscillation frequency range, change the
inductance, the capacitance, or both. For best phase-
noise performance keep the Q of the resonant tank as
high as possible:
where R
EQ
≈
10k
(Figure 2).
The oscillation frequency can be changed by altering
the control voltage, V
CTRL
.
Q
R
EQ
C
L
EQ
EQ
=
f
1
2
L
where
C
1
1
C1
1
C2
2
C
C
and
L
L
L
o
EQ EQ
EQ
VAR
STRAY
EQ
STRAY
=
=
+
+
+
=
+
π
Figure 4. Typical Resonant Tank Circuit
L = 100nH
C2 = 33pF
C1 = 33pF
47k
10k
47k
1/2 KV1410
1/2 KV1410
TANK
TANK
V
CTRL
0.1
μ
F
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| MAX2450CEP+T | 功能描述:調(diào)節(jié)器/解調(diào)器 RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
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