参数资料
型号: MICRF008YM TR
厂商: Micrel Inc
文件页数: 8/13页
文件大小: 0K
描述: IC RECEIVER 300-440MHZ 8-SOIC
标准包装: 2,500
频率: 300MHz ~ 440MHz
灵敏度: -95dBm
数据传输率 - 最大: 4.8 kbps
调制或协议: OOK
应用: 车库门开启器
电流 - 接收: 7mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
特点: 自动调谐
电源电压: 4.75 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
其它名称: MICRF008YMTR
MICRF008YMTR-ND
Micrel, Inc.
Compa-
rator
VDDBB
10μA
DO
MICRF008
Control Input (SEL0)
Control input circuitry is shown in Figure 6. The 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” pullup to VDDBB. Typical pullup
current is 5 μ A, leading to an impedance to the VDDBB
supply of typically 1M ? .
VDDBB
10μA
Q1
REFOSC Pin
VSSBB
Figure 4. DO Pin
VSSBB
Logic
Input
Q2
Q3
to Interna
Circuits
The REFOSC input circuit is shown in Figure 5. Input
impedance is quite high (200k ? ). This is a Colpitts
oscillator, with internal 30pF capacitors. This input is
intended to work with standard ceramic resonators,
connected from this pin to VSSBB. The resonators
should not contain integral capacitors, since these
capacitors are contained inside the IC. 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.
VSSBB
Figure 6. SEL0
Active
Bias
VDDBB
REFOSC
30pF
30pF
200k
250
15μA
VSSBB
VSSBB
Figure 5. REFOSC Pin
August 2008
8
M9999-080108
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