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參數(shù)資料
| 型號(hào)： | SA602AFE |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 衰減器 |
| 英文描述： | DOUBLE BALANCED MIXER AND OSCILLATOR |
| 中文描述： | RF/MICROWAVE DOUBLE BALANCED MIXER |
| 文件頁(yè)數(shù)： | 4/11頁(yè) |
| 文件大?。?/td> | 109K |
| 代理商： | SA602AFE |
Philips Semiconductors
Product specification
SA602A
Double-balanced mixer and oscillator
1997 Nov 07
4
The oscillator is capable of sustaining oscillation beyond 200MHz in
crystal or tuned tank configurations. The upper limit of operation is
determined by tank “Q” and required drive levels. The higher the
“Q” of the tank or the smaller the required drive, the higher the
permissible oscillation frequency. If the required LO is beyond
oscillation limits, or the system calls for an external LO, the external
signal can be injected at Pin 6 through a DC blocking capacitor.
External LO should be at least 200mV
P-P
.
Figure 7 shows several proven oscillator circuits. Figure 7a is
appropriate for cellular radio. As shown, an overtone mode of
operation is utilized. Capacitor C3 and inductor L1 suppress
oscillation at the crystal fundamental frequency. In the fundamental
mode, the suppression network is omitted.
Figure 8 shows a Colpitts varactor tuned tank oscillator suitable for
synthesizer-controlled applications. It is important to buffer the
output of this circuit to assure that switching spikes from the first
counter or prescaler do not end up in the oscillator spectrum. The
dual-gate MOSFET provides optimum isolation with low current.
The FET offers good isolation, simplicity, and low current, while the
bipolar transistors provide the simple solution for non-critical
applications. The resistive divider in the emitter-follower circuit
should be chosen to provide the minimum input signal which will
assure correct system operation.
When operated above 100MHz, the oscillator may not start if the Q
of the tank is too low. A 22k
resistor from Pin 7 to ground will
increase the DC bias current of the oscillator transistor. This
improves the AC operating characteristic of the transistor and
should help the oscillator to start. A 22k
resistor will not upset the
other DC biasing internal to the device, but smaller resistance
values should be avoided.
8
7
6
5
4
3
2
1
OUTPUT
150pF
330pF
120pF
1.5 to
μ
H
100nF
220pF
INPUT
47pF
22pF
1nF
100nF
10nF
V
CC
6.8
μ
F
5.5
μ
H
0.209 to 0.283
μ
H
10pF
34.545MHz THIRD OVERTONE CRYSTAL
602A
0.5 to 1.3
μ
H
SR00070
Figure 3. Test Configuration
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| SA602AN | 制造商:NXP Semiconductors 功能描述:IC MIXER/AMP/OSC DIP8 602 制造商:NXP Semiconductors 功能描述:IC, MIXER/AMP/OSC, DIP8, 602 制造商:NXP 功能描述:200Mhz 8-DIP Double Balanced Mixer 制造商:NXP Semiconductors 功能描述:IC, DOUBLE BALANCED MIXER, 200MHZ, 8-DIP; Frequency Max:200MHz; RF Type:Cellular, HF, LAN, VHF; Supply Voltage Min:4.5V; Supply Voltage Max:8V; RF IC Case Style:DIP; No. of Pins:8; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
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