- 您现在的位置：买卖IC网 > PDF目录18782 > MICRF219AAYQS (Micrel Inc)IC RECEIVER QWIKRADIO 16QSOP PDF资料下载
参数资料
| 型号： | MICRF219AAYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER QWIKRADIO 16QSOP |
| 标准包装： | 98 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -112.5dBm |
| 调制或协议： | ASK，OOK |
| 应用： | 通用 |
| 电流 - 接收： | 4.3mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 配有 RSSI |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 其它名称： | 576-3899-5 |
Micrel, Inc.
The ability of the chip to track to a signal that
DECREASED in strength is much slower, since only
1.5 μ A is available to charge CAGC to increase the gain.
When designing a transmitter that communicates with
the MICRF219A, ensure that the power level remains
constant throughout the transmit burst.
The value of CAGC impacts the time to good data
(TTGD), which is defined as the time when signal is first
applied, to when the pulse width at DO is within 10% of
the steady state value. The optimal value of CAGC
depends on the setting of the D4 and D3 bits. A smaller
CAGC value does NOT always result in a shorter TTGD.
This is due to the loop dynamics, the fast discharge
current being 600μA, and the charge current being only
1.5μA. For example, if D4 = D3 = 0, the low pass filter
bandwidth is set to a minimum and CAGC capacitance is
too small, TTGD will be longer than if CAGC capacitance
is properly chosen. This is because when RF signal first
appears, the fast discharge period will reduce V CAGC very
fast, lowering the gain of the mixer and IF amplifier. But
since the low pass filter bandwidth is low, it takes too
long for the AGC comparator to see a reduced level of
the audio signal, so it can not stop the discharge current.
This causes an undershoot in CAGC voltage and a
corresponding overshoot in RSSI voltage. Once CAGC
undershoots, it takes a long time for it to charge back up
because the current available is only 1.5μA.
Table 3 lists the recommended minimum CAGC values
for different D[4:3] settings to insure that the voltage on
CAGC does not undershoot. The recommendation also
takes into account the behavior in auto-polling. If CAGC
is too small, the chip can have a tendency to false wake
up (DO releases even when there is no input signal).
MICRF219A
the fast discharge current on CAGC, and the loop is too
slow to stop this fast discharge current in time. Since the
voltage on CAGC is too low, the audio signal level is
lower than the slicing threshold (voltage on CTH), and
DO pin is low. Once the fast discharge current stops,
only the small 1.5μA charge current is available in
settling the AGC loop to the correct level, causing the
recovery from CAGC undershoot/RSSI overshoot
condition to be slow. As a result, TTGD is about 9.1ms.
Figure 3. RSSI Overshoot and Slow TTGD (9.1ms)
Figure 4 shows the behavior with a larger capacitor on
CAGC pin (2.2 μ F), D[4:3] = 01. In this case, V CAGC does
not undershoot (RSSI does not overshoot), and TTGD is
relatively short at 1ms.
D4
0
0
1
1
D3
0
1
0
1
CAGC value
4.7 μ F
2.2 μ F
1 μ F
1 μ F
Table 3. Minimum Suggested CAGC Values
Figure 3 illustrates what occurs if CAGC capacitance is
too small for a given D[4:3] setting. Here, D[4:3] = 01,
the capacitance on CAGC pin is 0.47 μ F, and the RF
input level is stepped from no signal to ? 100dBm. RSSI
voltage is shown instead of CAGC voltage because
RSSI is a buffered version of CAGC (with an inversion
and amplification). Probing CAGC directly can affect the
loop dynamics through resistive loading from a scope
probe, especially in the state where only 1.5 μ A is
available, whereas probing RSSI does not. When RF
signal is first applied, RSSI voltage overshoots due to
Figure 4. Proper TTGD (1ms) with Sufficient CAGC
July 2011
11
M9999-071811-A
RadioTech@micrel.com or (408) 944-0800
相关PDF资料 |
PDF描述 |
|---|---|
| MICRF219AYQS | IC RECEIVER QWIKRADIO 16-QSOP |
| MICRF220AYQS | RCVR ASK/OOK 300-450MHZ 16QSOP |
| NP80N06MLG-S18-AY | MOSFET N-CH 60V 80A TO-220 |
| IXTP1R6N50D2 | MOSFET N-CH 500V 1.6A TO220AB |
| MICRF008YM | IC RECEIVER 300-440MHZ 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF219AAYQS TR | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, 6mA, <10kbps, ASK Receiver with Auto-Poll, RSSI and Squelch (Recommended for New Designs) 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 |
| MICRF219AAYQS-TR | 功能描述:- RF Receiver ASK, OOK 300MHz ~ 450MHz -112.5dBm PCB, Surface Mount 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:300MHz ~ 450MHz 灵敏度:-112.5dBm 数据速率（最大值）:- 调制或协议:ASK，OOK 应用:通用 电流 - 接收:4.3mA 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特性:配有 RSSI 电压 - 电源:3 V ~ 3.6 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF219AYQS | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF219AYQS TR | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF220 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300MHz to 450MHz, 3.3V ASK/OOK Receiver with RSSI and Squelch |
发布紧急采购，3分钟左右您将得到回复。