收藏本站
Micrel
Figure 3 illustrates the CAGC pin interface circuit. The
AGC control voltage is developed as an integrated current
into a capacitor CAGC. The attack current is nominally
7μA, while the decay current is a 10 times scaling of this,
approximately 85μA. Signal gain of the RF/IF strip inside
the IC diminishes as the voltage on CAGC decreases. By
simply adding a capacitor to CAGC pin, the attack/decay
time constant ratio is fixed at 10:1. Modification of the
attack/decay ratio is possible by adding resistance from the
CAGC pin to either VDDBB or VSSBB, as desired.
Both the push and pull current sources are disabled during
shutdown, which maintains the voltage across CAGC, and
improves recovery time in duty-cycled applications. To
further improve duty-cycle recovery, both push and pull
currents are increased by 2 times for approximately 10ms
after release of the SHUT pin. This allows rapid recovery of
any voltage droop on CAGC while in shutdown.
DO Pin
The output stage for the digital output (DO) is shown in
Figure 4. The output is a 45μA push and 45μA pull
switched-current stage. This output stage is capable of
Figure 5. REFOSC Pin
SEL0, SEL1, SWEN, and SHUT Pins
MICRF009
driving
CMOS
loads.
An external buffer-driver
is
recommended for driving high capacitance loads.
Figure 6a. SEL0/SEL1/SWEN Pins
Figure 6b. SHUT Pin
Control input circuitry is shown in Figure 6a and 6b. The
Figure 4. DO Pin
REFOSC1 and REFOSC2 Pin
The REFOSC input circuit is shown in Figure 5. Input
impedance is quite high (200k ? ). This is a Colpitts
oscillator, with internal 10pF capacitors. This input is
intended to work with standard crystal resonators,
connected from this pin to REFOSC2.
This REFOSC2 pin appears as a low resistance path to
VSS during normal operation and is an input to a buffer
amplifier used during the initial start up phase to ensure
rapid build up of crystal oscillations.
The resonators should not contain integral capacitors,
since these capacitors are contained inside the IC.
standard input is a logic inverter constructed with minimum
geometry MOSFETs (Q2, Q3). P-Channel MOSFET Q1 is
a large channel length device, which functions essentially
as a “weak” pull-up to VDDBB. Typical pull-up current is
5μA, leading to an impedance to the VDDBB supply of
typically 1M ? .
Externally
applied
signals
should
be AC-coupled,
amplitude limited to approximately 0.5V PP . The nominal
DC bias voltage on this pin is 1.4V
January 18, 2005
11
M9999-011805
(408) 955-1690
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MICRF010BMTR IC RCVR UHF 300-440MHZ 8-SOIC
MICRF011BM TR IC RCVR/DATAMOD300-440MHZ 14SOIC
MICRF022YM-FS12 IC RECEIVER ASK 300-440MHZ 8SOIC
MICRF211AYQS TR IC RCVR 3V 433.92MHZ 16-QSOP
MICRF213AYQS TR IC RX 3.3V 300-350 MHZ 16QSOP
MICRF218AYQS TR IC RCVR QWIKRADIO 3.3V 16QSOP
MICRF219AAYQS TR IC RECEIVER QWIKRADIO 16QSOP
MICRF219AYQS TR IC RECEIVER QWIKRADIO 16QSOP
相关代理商/技术参数
MICRF009YM 功能描述:射频接收器 300-440MHz High Sensitivity Receiver( Lead Free) 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
MICRF009YM TR 功能描述:射频接收器 300-440MHz High Sensitivity Receiver( Lead Free) 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
MICRF010 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:QwikRadio Low-Power UHF Receiver
MICRF010BM 功能描述:IC RCVR UHF 300-440MHZ 8-SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘
MICRF010BMTR 功能描述:IC RCVR UHF 300-440MHZ 8-SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘
MICRF010YM 功能描述:射频接收器 Low Power 300-440MHz High Sensitivity Receiver( Lead Free) 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
MICRF010YM TR 功能描述:射频接收器 Low Power 300-440MHz High Sensitivity Receiver( Lead Free) 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
MICRF011 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:QwikRadiotm Receiver/Data Demodulator Preliminary Information