MAX2620 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

19-1248; Rev 1; 5/98
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10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
_________________General Description
The MAX2620 combines a low-noise oscillator with two
output buffers in a low-cost, plastic surface-mount,
ultra-small µMAX package. This device integrates func-
tions typically achieved with discrete components. The
oscillator exhibits low phase noise when properly
mated with an external varactor-tuned resonant tank
circuit. Two buffered outputs are provided for driving
mixers or prescalers. The buffers provide load isolation
to the oscillator and prevent frequency pulling due to
load-impedance changes. Power consumption is typi-
cally just 27mW in operating mode (V_CC = 3.0V), and
drops to less than 0.3µW in standby mode. The MAX2620
operates from a single +2.7V to +5.25V supply.
________________________Applications
Analog Cellular Phones
Digital Cellular Phones
900MHz Cordless Phones
900MHz ISM-Band Applications
Land Mobile Radio
Narrowband PCS (NPCS)
____________________________Features
♦ Low-Phase-Noise Oscillator: -110dBc/Hz
(25kHz offset from carrier) Attainable
♦ Operates from Single +2.7V to +5.25V Supply
♦ Low-Cost Silicon Bipolar Design
♦ Two Output Buffers Provide Load Isolation
♦ Insensitive to Supply Variations
♦ Low, 27mW Power Consumption (V_CC = 3.0V)
♦ Low-Current Shutdown Mode: 0.1µA (typ)
_______________Ordering Information
PART
MAX2620EUA
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
MAX2620E/D
-40°C to +85°C
Dice*
*Dice are tested at T_A = +25°C, DC parameters only.
Pin Configuration appears at end of data sheet.
____________________________________________________Typical Operating Circuit
V_CC
10Ω
V_TUNE
1k
D1
ALPHA
SMV1204-34
C17
1.5pF
1000pF
C5
1.5pF
CERAMIC
C6
RESONATOR
L1
C3
2.7pF
C4
1pF
1 VCC1
2 TANK
3 FDBK
MAX2620
4 SHDN BIAS
SUPPLY
SHDN
V_CC
10nH
OUT 8
VCC2 ⁷
GND ⁶
OUT 5
1000pF
1.5pF
V_CC
0.1µF
1000pF
OUT TO MIXER
OUT TO SYNTHESIZER
1000pF
51Ω
V_CC
900MHz BAND OSCILLATOR
________________________________________________________________ Maxim Integrated Products 1
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