- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384656 > MAX2451 (MAXIM INTEGRATED PRODUCTS INC) 3V, Ultra-Low-Power Quadrature Demodulator PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX2451 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 衰減器 |
| 英文描述： | 3V, Ultra-Low-Power Quadrature Demodulator |
| 中文描述： | RF/MICROWAVE I/Q MODEM |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 58K |
| 代理商： | MAX2451 |
Quadrature Phase Generator
The quadrature phase generator uses two latches to
divide the local-oscillator frequency by two, and gener-
ates two precise quadrature signals. Internal limiting
amplifiers shape the signals to approximate square
waves to drive the Gilbert-cell mixers. The inphase sig-
nal (at half the local oscillator frequency) is further
divided by four for the prescaler output.
Presc aler
The prescaler output, PRE_OUT, is buffered and swings
typically 0.35Vp-p with a 10k
and 6pF load. It can be
AC coupled to the input of a frequency synthesizer.
Master Bias
During normal operation, ENABLE should be above
V
CC
- 0.4V. Pulling the ENABLE input low shuts off the
master bias and reduces the circuit current to typically
2μA. The master bias section includes a bandgap ref-
erence generator and a PTAT (Proportional To Absolute
Temperature) current generator.
__________Applic ations Information
Figure 3 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 3, 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. The oscillation frequency can be
determined using the following formula:
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
.
M
3V, Ultra-Low-Power
Quadrature Demodulator
_______________________________________________________________________________________
5
Figure 2. Local-Oscillator Equivalent Circuit
R
L
5k
R
L
5k
Q1
Q3
Q4
TOQUADRATURE
GENERATOR AND
PRESCALER
Q2
TANK
TANK
LO_V
CC
Figure 3. 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
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
Q
R
EQ
CEQ
LEQ
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX2451CSE | 3V, Ultra-Low-Power Quadrature Demodulator |
| MAX2452 | 3V, Ultra-Low-Power Quadrature Modulator |
| MAX2463EAI | 900MHz Image-Reject Transceivers |
| MAX2421EAI | 900MHz Image-Reject Transceivers |
| MAX2460EAI | 900MHz Image-Reject Transceivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX24510EVKIT# | 制造商:Microsemi Corporation 功能描述:MAX24510 EVALUATION KIT - Boxed Product (Development Kits) 制造商:Microsemi Corporation 功能描述:KIT EVALUATION MAX24510 |
| MAX24510EXG+ | 制造商:Microsemi Corporation 功能描述:10 OUT ANY-RATE CLOCK MULTIPLIER W/EEPROM - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC CLK MULT 10-OUT EEPROM 制造商:Microsemi Corporation 功能描述:IC CLK MULT 10-OUT EEPROM 制造商:Microsemi Corporation 功能描述:MAX24515 Series 10 Output 750 Mhz Any-Rate Clock Multiplier w/ Internal EEPROM |
| MAX2451CSE | 制造商:Maxim Integrated Products 功能描述:3V, ULTRA-LOW-POWER QUADRATURE DEMODULATOR - Bulk |
| MAX2451CSE+ | 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 |
| MAX2451CSE+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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。