19-1248; Rev 1; 5/98
1 0 MHz t o 1 0 5 0 MHz In t e g ra t e d
RF Os c illa t o r w it h Bu ffe re d Ou t p u t s
MAX620
_________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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
os c illa tor e xhib its low p ha s e nois e whe n p rop e rly
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-
♦ 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
= 3.0V)
CC
cally just 27mW in operating mode (V
drops to less than 0.3µW in standby mode. The MAX2620
operates from a single +2.7V to +5.25V supply.
= 3.0V), and
CC
♦ Low-Current Shutdown Mode: 0.1µA (typ)
________________________Ap p lic a t io n s
_______________Ord e rin g In fo rm a t io n
Analog Cellular Phones
Digital Cellular Phones
900MHz Cordless Phones
900MHz ISM-Band Applications
Land Mobile Radio
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
MAX2620EUA
MAX2620E/D
Dice*
*Dice are tested at T = +25°C, DC parameters only.
A
Pin Configuration appears at end of data sheet.
Narrowband PCS (NPCS)
____________________________________________________Typ ic a l Op e ra t in g Circ u it
V
CC
V
CC
10Ω
1000pF
10nH
8
1000pF
1.5pF
1
VCC1
OUT
OUT TO MIXER
C5
1.5pF
C17
1.5pF
MAX2620
V
CC
2
3
TANK
FDBK
7
6
V
TUNE
VCC2
C3
2.7pF
1k
0.1µF
51Ω
GND
OUT
CERAMIC
RESONATOR
L1
C6
1000pF
D1
C4
1pF
4
SHDN
BIAS
SUPPLY
5
ALPHA
SMV1204-34
OUT TO SYNTHESIZER
SHDN
V
CC
1000pF
900MHz BAND OSCILLATOR
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.