- 您现在的位置：买卖IC网 > PDF目录383346 > MAX2426 (Maxim Integrated Products, Inc.) Dual monostable multivibrators with Schmitt-trigger inputs 16-PDIP 0 to 70 PDF资料下载
参数资料
| 型号： | MAX2426 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual monostable multivibrators with Schmitt-trigger inputs 16-PDIP 0 to 70 |
| 中文描述： | 900MHz镜频抑制接收器，带有发送混频器 |
| 文件页数： | 12/14页 |
| 文件大小： | 163K |
| 代理商： | MAX2426 |
To disable the prescaler entirely, leave PREGND and
PREOUT unconnected. Also connect the MOD and
DIV1 pins to GND. Disabling the prescaler does not
affect operation of the VCO stage.
Power Management
The MAX2424/MAX2426 supports four different power-
management features to conserve battery life. The VCO
section has its own control pin (VCOON), which also
serves as a master bias pin. When VCOON is high, the
LO, quadrature LO phase shifters, and prescaler or LO
buffer are all enabled. Stabilize VCO by powering it up
prior to transmitting or receiving. For transmit-to-receive
switching, the receiver and transmitter sections have
their own enable control inputs, RXON and TXON. With
VCOON high, bringing RXON high enables the receive
path, which consists of the LNA, image-reject mixers,
and IF output buffer. When this pin is low, the receive
path is inactive. The TXON input enables the upcon-
verter mixer and PA predriver. VCOON must be high for
the transmitter to operate. When TXON is low, the trans-
mitter is off.
To disable all chip functions and reduce the supply cur-
rent to typically 0.5μA, pull VCOON, DIV1, MOD, RXON,
and TXON low.
___________Applications Information
Oscillator Tank
The on-chip oscillator requires a parallel-resonant tank
circuit connected across TANK and
TANK
. Figure 4
shows an example of an oscillator tank circuit. Inductor
L4 provides DC bias to the tank ports. Inductor L3,
capacitor C26, and the series combination of capaci-
tors C2, C3, and both halves of the varactor diode
capacitance set the resonant frequency as follows:
where C
D1
is the capacitance of one varactor diode.
Choose tank components according to your application
needs, such as phase-noise requirements, tuning
range, and VCO gain. High Q inductors such as air-
core micro springs yield low phase noise. Use a low-
tolerance inductor (L3) for predictable oscillation
frequency. Resistors R6 and R7 can be chosen from 0
to 20
to reduce the Q of parasitic resonance due to
series package inductance L
T
. Keep R6 and R7 as
small as possible to minimize phase noise, yet large
enough to ensure oscillator start-up in fundamental
mode. Oscillator start-up with be most critical with high
tuning bandwidth (low tank Q) and high temperature.
Capacitors C2 and C3 couple in the varactor. Light
coupling of the varactor is a way to reduce the effects
of high varactor tolerance and increase loaded Q. For a
wider tuning range, use larger values for C2 and C3 or
a varactor with a large capacitance ratio. Capacitor
C26 is used to trim the tank oscillator frequency. Larger
values for C26 will help negate the effect of stray PCB
capacitance and parasitic inductor capacitance (L3).
Choose a low-tolerance capacitor for C26.
C
=
1
1
C2
1
C3
2
C
EFF
D1
+
+
+
C26
f =
1
2
EFF
π
( )
(
)
M
900MHz Image-Reject Receiver
with Transmit Mixer
12
______________________________________________________________________________________
MAX2424
MAX2426
TANK
L3
6.8nH
L4
100nH
R5
1k
R4
1k
1/2 D1
1/2 D1
D1 = ALPHA SMV1299-004
SEE FIGURE 1 FOR R6, R7, C2, C3, C26, AND L3 COMPONENT VALUES.
C1
47pF
VCO_CTRL
R7
R6
C3
R8
47k
C2
C26
V
CC
TANK
Figure 4. Oscillator Tank Schematic Using the On-Chip VCO
相关PDF资料 |
PDF描述 |
|---|---|
| MAX2426EAI | 900MHz Image-Reject Receivers with Transmit Mixer |
| MAX2510EEI | Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator |
| MAX2510 | Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator |
| MAX252AEHG | Circular Connector; No. of Contacts:19; Series:MS27466; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:25-19 RoHS Compliant: No |
| MAX252 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2426EAI | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2426EAI+ | 功能描述:射频接收器 Integrated Circuits (ICs) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2426EAI+T | 功能描述:射频接收器 Integrated Circuits (ICs) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2426EAI-T | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2426EVKIT-SO | 功能描述:射频开发工具 RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
发布紧急采购，3分钟左右您将得到回复。