MAX2620 查看數據表（PDF） - Maxim Integrated
零件编号
产品描述 (功能)
比赛名单
MAX2620 Datasheet PDF : 11 Pages
| |||
10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
_____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit, VCC = +3.0V, VTUNE = 1.5V, SHDN = VCC, load at OUT = 50Ω, load at OUT = 50Ω, L1 = coaxial ceramic
resonator: Trans-Tech SR8800LPQ1357BY, C6 = 1pF, TA = +25°C, unless otherwise noted.)
PHASE NOISE vs. TEMPERATURE
-104
SSB @ ∆f = 25kHz
-106
-108
L1 = 5nH INDUCTOR
C6 = 1.5pF
-110
L1 = COAXIAL CERAMIC RESONATOR
-112 (TRANS-TECH SR8800LPQ1357BY)
C6 = 1pF
-114
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
OUTPUT SPECTRUM
FUNDAMENTAL NORMALIZED TO 0dB
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
1.3 2.6 3.9 5.2
6.5
FREQUENCY (GHz)
SINGLE SIDEBAND PHASE NOISE
-40
-50
L1 = 5nH INDUCTOR
-60
C6 = 1.5pF
-70
-80
-90
-100
-110
L1 = COAXIAL
-120 CERAMIC RESONATOR
-130 (TRANS-TECH
-140 SR8800LPQ1357BY)
C6 = 1pF
-150
0.1
1
10
100
1000
OFFSET FREQUENCY (kHz)
_______________________________________________________________Pin Description
PIN NAME
FUNCTION
Oscillator DC Supply Voltage. Decouple VCC1 with 1000pF capacitor to ground. Use a capacitor with low
1
VCC1
series inductance (size 0805 or smaller). Further power-supply decoupling can be achieved by adding a
10Ω resistor in series from VCC1 to the supply. Proper power-supply decoupling is critical to the low noise
and spurious performance of any oscillator.
2
TANK Oscillator Tank Circuit Connection. Refer to the Applications Information section.
Oscillator Feedback Circuit Connection. Connecting capacitors of the appropriate value between FDBK and
3
FDBK TANK and between FDBK and GND tunes the oscillator’s reflection gain (negative resistance) to peak at the
desired oscillation frequency. Refer to the Applications Information section.
4
SHDN
Logic-Controlled Input. A low level turns off the entire circuitry such that the IC will draw only leakage current
at its supply pins. This is a high-impedance input.
Open-Collector Output Buffer (complement). Requires external pull-up to the voltage supply. Pull-up can be
5
OUT
resistor, choke, or inductor (which is part of a matching network). The matching-circuit approach provides
the highest-power output and greatest efficiency. Refer to Table 1 and the Applications Information section.
OUT can be used with OUT in a differential output configuration.
6
GND Ground Connection. Provide a low-inductance connection to the circuit ground plane.
7
VCC2
Output Buffer DC Supply Voltage. Decouple VCC2 with a 1000pF capacitor to ground. Use a capacitor with
low series inductance (size 0805 or smaller).
Open-Collector Output Buffer. Requires external pull-up to the voltage supply. Pull-up can be resistor,
8
OUT
choke, or inductor (which is part of a matching network). The matching-circuit approach provides the high-
est-power output and greatest efficiency. Refer to Table 1 and the Applications Information section. OUT
can be used with OUT in a differential output configuration.
6 _______________________________________________________________________________________
Share Link: 