Datasheet
MAX2620
1
V
CC
1
TANK
FDBK
SHDN
2
3
4
8
OUT
V
CC
2
GND
OUT
7
6
5
V
CC
V
CC
V
CC
V
CC
BIAS
SUPPLY
C17
1.5pF
C5
C6
1000pF
1000pF
1000pF
10Ω
CERAMIC
RESONATOR
L1
V
TUNE
900MHz BAND OSCILLATOR
1kΩ
D1
ALPHA
SMV1204-34
1.5pF 1.5pF
51Ω
10nH
C3
2.7pF
C4
1pF
0.1µF
1000pF
OUT TO SYNTHESIZER
OUT TO MIXER
SHDN
MAX2620
10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
________________________________________________________________ Maxim Integrated Products 1
19-1248; Rev 2; 2/02
EVALUATION KIT
AVAILABLE
_________________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)
PART
MAX2620EUA -40°C to +85°C
TEMP RANGE PIN-PACKAGE
8 µMAX
_______________Ordering Information
MAX2620E/D -40°C to +85°C Dice*
Pin Configuration appears at end of data sheet.
*Dice are tested at T
A
= +25°C, DC parameters only.
____________________________________________________Typical Operating Circuit
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.