max2620euat Maxim Integrated Products, Inc., max2620euat Datasheet

no-image

max2620euat

Manufacturer Part Number
max2620euat
Description
Max2620 10mhz To 1050mhz Integrated Rf Oscillator With Buffered Outputs
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
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
drops to less than 0.3µW in standby mode. The MAX2620
operates from a single +2.7V to +5.25V supply.
_________________General Description
________________________Applications
19-1248; Rev 2; 2/02
____________________________________________________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.
V
TUNE
SMV1204-34
ALPHA
1k
Analog Cellular Phones
Digital Cellular Phones
900MHz Cordless Phones
900MHz ISM-Band Applications
Land Mobile Radio
Narrowband PCS (NPCS)
D1
________________________________________________________________ Maxim Integrated Products
1.5pF
C17
RESONATOR
CERAMIC
L1
RF Oscillator with Buffered Outputs
SHDN
1000pF
1.5pF
C5
C6
10
CC
C3
2.7pF
C4
1pF
V
= 3.0V), and
10MHz to 1050MHz Integrated
CC
1 V
2
3
4
SHDN
TANK
FDBK
CC
900MHz BAND OSCILLATOR
1
SUPPLY
BIAS
MAX2620
_______________Ordering Information
____________________________Features
*Dice are tested at T
Pin Configuration appears at end of data sheet.
MAX2620EUA
MAX2620E/D
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
Low-Current Shutdown Mode: 0.1µA (typ)
PART
1000pF
V
GND
OUT
OUT
CC
2
10nH
8
5
7
6
A
= +25°C, DC parameters only.
V
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
CC
51
0.1 F
V
CC
1000pF
V
CC
1000pF
1.5pF
8 µMAX
Dice*
PIN-PACKAGE
CC
OUT TO MIXER
OUT TO SYNTHESIZER
= 3.0V)
1

Related parts for max2620euat

max2620euat Summary of contents

Page 1

Rev 2; 2/02 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 ...

Page 2

Integrated RF Oscillator with Buffered Outputs ABSOLUTE MAXIMUM RATINGS GND .................................................-0. TANK, SHDN to GND .................................-0. OUT, OUT to GND...........................(V CC FDBK to GND ..................................(V CC ...

Page 3

RF Oscillator with Buffered Outputs TYPICAL OPERATING CIRCUIT PERFORMANCE—900MHz Band Ceramic- Resonator-Based Tank (Typical Operating Circuit +3.0V resonator: Trans-Tech SR8800LPQ1357BY 1pF, T PARAMETER Tuning Range V TUNE SSB 25kHz Phase Noise ...

Page 4

Integrated RF Oscillator with Buffered Outputs __________________________________________Typical Operating Characteristics = +3.0V, SHDN = V (Test Circuit of Figure unless otherwise noted.) OUT OUTPUT POWER vs. FREQUENCY OVER V AND TEMPERATURE ...

Page 5

RF Oscillator with Buffered Outputs _____________________________Typical Operating Characteristics (continued) (Typical Operating Circuit +3.0V resonator: Trans-Tech SR8800LPQ1357BY 1pF, T REVERSE ISOLATION vs. FREQUENCY V = 2.7V TO 5.25V CC 0 C3, C4 REMOVED -10 -20 ...

Page 6

Integrated RF Oscillator with Buffered Outputs _____________________________Typical Operating Characteristics (continued) (Typical Operating Circuit +3.0V resonator: Trans-Tech SR8800LPQ1357BY 1pF, T PHASE NOISE vs. TEMPERATURE -104 SSB @ f = 25kHz -106 -108 ...

Page 7

RF Oscillator with Buffered Outputs 1000pF TEST PORT C3* C2* 2.7pF 1000pF C4* V 1pF CC ON OFF 10 Figure 1. 900MHz Test Circuit _______________Detailed Description The oscillator is a common-collector, negative- resistance type that uses the ...

Page 8

Integrated RF Oscillator with Buffered Outputs Keeping the resonant tank circuit’s real component less than one-half the magnitude of the negative real com- ponent ensures that oscillations will start. After start-up, the oscillator’s negative resistance decreases, primarily ...

Page 9

RF Oscillator with Buffered Outputs 0. OUT CC 30pF 2 TANK MAX2620 3 120pF FDBK GND 4 SHDN OUT 120pF SHDN X = STATEK AT-3004 10MHz FUNDAMENTAL MODE ...

Page 10

Integrated RF Oscillator with Buffered Outputs C17 C STRAY C D1 VARACTOR+ PC BOARD COUPLING PARASITICS RESONANT TANK MODEL Figure 5. Electrical Model of MAX2620 Circuit resonators or high-Q inductors. Also, keep C5 and C17 (see the ...

Page 11

RF Oscillator with Buffered Outputs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ÿ 0.50±0.1 0.6±0.1 1 0.6±0.1 D TOP VIEW A1 A2 ...

Related keywords