|
|
PDF MAX2402 Data sheet ( Hoja de datos )
| Número de pieza | MAX2402 | |
| Descripción | 800MHz to 1000MHz Transmitter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX2402 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
|
No Preview Available !
19-0392; Rev 1; 5/96
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
800MHz to 1000MHz Transmitter
_______________General Description
The MAX2402 transmitter integrates a double-balanced
mixer, buffered local oscillator (LO) port, variable gain
stage, and power amplifier into a single IC. It is intend-
ed for use in the 800MHz to 1000MHz band, and is
compatible with both direct-sequence and frequency-
hopping spread-spectrum designs in the 902MHz to
928MHz ISM band.
In a typical application, a digital baseband signal is
mixed with a local oscillator signal to yield a BPSK-
modulated carrier at the antenna. Alternatively, the
baseband input may be grounded and an FSK-
modulated LO signal applied directly to the LO port.
The LO port consists of a limiting amplifier that can
accept a single-ended or differential signal with input
power between -6dBm and +6dBm in the 800MHz to
1000MHz frequency range. The baseband modulation
input is linear over a 2V range, and limits with larger
signal levels within the supply range. The double-
balanced mixer has been optimized for high carrier
rejection. The variable gain stage offers typically 40dB
of adjustment range. The power amplifier provides
more than 20dBm output power and has a bias adjust-
ment, which allows adjustment of efficiency and
harmonic distortion.
A shutdown function reduces the current draw to less
than 2µA in less than 10µs. The MAX2402 comes in a
20-pin SSOP package to minimize board area.
________________________Applications
Direct-Sequence Spread-Spectrum Transmitter
Frequency-Hopping Spread-Spectrum
Transmitter
FSK, GMSK, BPSK, and ASK Digital Transmitter
AM and FM Analog Transmitter
________________Functional Diagram
MODULATION
BUFFER
MOD
MIXER
VGC
VGC
POWER
AMPLIFIER
OUT
LO INPUT
BUFFER
LO+
LO-
MASTER BIAS
SHDN
BADJ
____________________________Features
o Low-Cost, Flexible Transmitter
o More than 100mW of Output Power into 50Ω
o Operates from 800MHz to 1000MHz
o Single +5V Supply
o 20-Pin SSOP Package
o Uses Less than 2µA in Power-Down
o More than 35dB of Power Adjustment Range
o LO Input Power Range from -6dBm to +6dBm
o 2V Linear Range on Modulation Input
______________Ordering Information
PART
MAX2402EAP*
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
* An alternate marking, MAX2402CAP, has been identically tested.
__________________Pin Configuration
TOP VIEW
VGC 1
MOD 2
GND 3
VCC 4
GND 5
LO+ 6
LO- 7
GND 8
SHDN 9
BADJ 10
MAX2402
20 GND
19 VCC
18 GND
17 GND
16 OUT
15 GND
14 OUT
13 GND
12 VCC
11 LGND
SSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
800MHz to 1000MHz Transmitter
BADJ can be left open or adjusted with a single pull-
up or pull-down resistor to VCC or GND, respectively.
The value of this resistor determines the amount of
adjustment applied. A single resistor results in no cur-
rent flow at BADJ during power-down (whereas a
resistor divider always has current flowing through the
resistors). Table 1 shows the approximate bias adjust
voltage at the pin for different resistor values. At lower
LO frequencies, where the transmitter gain and output
power is the highest, setting BADJ to a low voltage
(maximum bias current) causes excessive current in
the output and can cause unstable behavior in the IC.
At lower LO frequencies (around 800MHz), more than
22dBm of power is easily obtained with BADJ set for
3V or more. If higher bias current and less distortion is
desired in the 800MHz range, using a lower inductor
value on LGND (pin 11) (see the Typical Application
Circuit) might make the desired bias level stable. At
higher frequencies (near 1000MHz), a lower bias level
voltage results in more power (see the Output Power vs.
Bias Control Voltage vs. Frequency graph in the Typical
Operating Characteristics).
Power Amplifier Output
The power amplifier has an open-collector output that
can drive into a load of 30Ω to 50Ω; however, maximum
power transfer is obtained at about 35Ω. 27nH to
ground is recommended on LGND (pin 11), as shown
in the Typical Application Circuit. This inductor is used
as a current source on the base of the output stage to
pull stored charge out of the base.
SHDN Input
The SHDN input completely shuts down the current
from the supply and all signal pins when switched
below 0.5V. During normal operation, SHDN should
remain above VCC - 0.5V.
The shutdown control shuts down the total current to
below 150nA (typ). Power-up occurs within 10µs.
__________Applications Information
The MAX2402 transmitter operates within the 800MHz
to 1000MHz frequency range. Figure 1 shows a typical
application circuit. Additional applications information
can be obtained from the MAX2402 evaluation kit
manual.
Table 1. Bias-Adjust Voltage for Various
Resistor Values
Resistor BADJ with Resistor BADJ with Resistor
Value (Ω) Connected to GND (V)* Connected to VCC (V)
10k 0.36
4.54
20k 0.63
4.27
30k 0.84
4.05
40k 1.00
3.89
50k 1.13
3.75
100k
1.54
3.34
200k
1.89
3.00
300k
2.05
2.85
400k
2.13
2.75
500k
2.20
2.68
1M 2.31
2.57
* Typical variation of BADJ over temperature and process is
less than 5%.
VARIABLE
GAIN CONTROL
MODULATION
VCC 39pF
1
VGC
2
MOD
3
GND
4
VCC
20
GND
19
VCC
18
GND
17
GND
VCC
39pF 0.01µF
5 MAX2402 16
GND OUT
50Ω
6
LO+
VCO
7 LO-
15
GND
OUT 14
VCC
47nH
50Ω
8
GND
SHUTDOWN
CONTROL
9
SHDN
10
BADJ
13
GND
12
VCC
39pF
11
LGND
VCC
300k 27nH
Figure 1. Typical Application Circuit
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MAX2402.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX240 | +5V-Powered / Multichannel RS-232 Drivers/Receivers | Maxim Integrated |
| MAX240 | (MAX220 - MAX249) +5V-Powered / Multichannel RS-232 Drivers/Receivers |  Maxim Integrated Products |
| MAX240 | +5V-Powered Multichannel RS-232 Drivers/Receivers | Maxim Integrated |
| MAX2402 | 800MHz to 1000MHz Transmitter | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |