MAX2620EUA-T Maxim Integrated Products, MAX2620EUA-T Datasheet - Page 6

• Manufacturer Part Number: MAX2620EUA-T
• Description: RF Wireless Misc 10MHz to 1050MHz VCO with Differential-O
• Manufacturer: Maxim Integrated Products

10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
_____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit, V
resonator: Trans-Tech SR8800LPQ1357BY, C6 = 1pF, T
_______________________________________________________________Pin Description
6
-104
-106
-108
-110
-112
-114
PIN
_______________________________________________________________________________________
1
2
3
4
5
6
7
8
-40
SSB @ f = 25kHz
L1 = 5nH INDUCTOR
C6 = 1.5pF
L1 = COAXIAL CERAMIC RESONATOR
(TRANS-TECH SR8800LPQ1357BY)
C6 = 1pF
PHASE NOISE vs. TEMPERATURE
-20
NAME
SHDN
TANK
FDBK
V
V
GND
OUT
OUT
CC
CC
1
2
TEMPERATURE (°C)
0
20
Oscillator DC Supply Voltage. Decouple VCC1 with 1000pF capacitor to ground. Use a capacitor with low
series inductance (size 0805 or smaller). Further power-supply decoupling can be achieved by adding a
10 resistor in series from VCC1 to the supply. Proper power-supply decoupling is critical to the low noise
and spurious performance of any oscillator.
Oscillator Tank Circuit Connection. Refer to the Applications Information section.
Oscillator Feedback Circuit Connection. Connecting capacitors of the appropriate value between FDBK and
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.
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
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.
Ground Connection. Provide a low-inductance connection to the circuit ground plane.
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,
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.
CC
40
= +3.0V, V
60
80
TUNE
-100
= 1.5V, SHDN = V
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
0
FUNDAMENTAL NORMALIZED TO 0dB
A
= +25°C, unless otherwise noted.)
1.3
OUTPUT SPECTRUM
FREQUENCY (GHz)
2.6
CC,
load at OUT = 50 , load at OUT = 50 , L1 = coaxial ceramic
FUNCTION
3.9
5.2
6.5
-100
-110
-120
-130
-140
-150
-40
-50
-60
-70
-80
-90
0.1
L1 = COAXIAL
CERAMIC RESONATOR
(TRANS-TECH
SR8800LPQ1357BY)
C6 = 1pF
SINGLE SIDEBAND PHASE NOISE
1
OFFSET FREQUENCY (kHz)
L1 = 5nH INDUCTOR
C6 = 1.5pF
10
100
1000