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參數資料
| 型號： | MICRF007 |
| 廠商： | MICREL INC |
| 元件分類： | 消費家電 |
| 英文描述： | QwikRadio Low-Power UHF Receiver |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO8 |
| 封裝： | SO-8 |
| 文件頁數： | 9/16頁 |
| 文件大?。?/td> | 96K |
| 代理商： | MICRF007 |
December 2000
9
MICRF007
MICRF007
I/O Pin Interface Circuitry
Interface circuitry for the various I/O pins of the MICRF007
are diagrammed in Figures 1 through 6. The ESD protection
diodes at all input and output pins are not shown.
ANT Pin
Micrel
50
3pF
6k
Active
Load
Active
Bias
ANT
Figure 1a. ANT Pin
The ANT pin is internally AC-coupled via a 3pF capacitor, to
an RF N-channel MOSFET, as shown in Figure 1. Impedance
on this pin to VSS is quite high at low frequencies, and
decreases as frequency increases. In the UHF frequency
range, the device input can be modeled as 6.3k
in parallel
with 2pF (pin capacitance) shunt to VSS0RF.
CTH Pin
6.9pF
PHI2B
PHI1B
PHI1
PHI2
CTH
Demodulator
Signal
2.85Vdc
VDDBB
VSSBB
VSSBB
Figure 2. CTH Pin
Figure 2 illustrates the CTH-pin interface circuit. The CTH pin
is driven from a P-channel MOSFET source-follower with
approximately 10
μ
A of bias. Transmission gates TG1 and
TG2 isolate the 6.9pF capacitor. Internal control signals
PHI1/PHI2 are related in a manner such that the impedance
across the transmission gates looks like a
“
resistance
”
of
approximately 100k
. The dc potential at the CTH pin is
approximately 1.6V
CAGC Pin
VDDBB
VSSBB
675μA
67.5μA
Compa-
rator
1.5μA
15μA
Timout
CAGC
Figure 3. CAGC Pin
Figure 3 illustrates the CAGC pin interface circuit. The AGC
control voltage is developed as an integrated current into a
capacitor C
AGC
. The attack current is nominally 15
μ
A, while
the decay current is a 1/10th scaling of this, nominally 1.5
μ
A,
making the attack/decay timeconstant ratio a fixed 10:1.
Signal gain of the RF/IF strip inside the IC diminishes as the
voltage at CAGC decreases. Modification of the attack/decay
ratio is possible by adding resistance from the CAGC pin to
V
DD
.
Both the push and pull current sources are disabled during
shutdown, which maintains the voltage across C
AGC
, and
improves recovery time in duty-cycled applications. To fur-
ther improve duty-cycle recovery, both push and pull currents
are increased by 45 times for approximately 10ms after
release of the SHUT pin. This allows rapid recovery of any
voltage droop on C
AGC
while in shutdown.
DO Pin
VDDBB
VSSBB
Compa-
rator
10μA
10μA
DO
Figure 4. DO Pin
The output stage for DO (digital output) is shown in Figure 4.
The output is a 10
μ
A push and 10
μ
A pull switched-current
stage. This output stage is capable of driving CMOS loads.
An external buffer-driver is recommended for driving high-
capacitance loads.
REFOSC Pin
250
200k
Active
Bias
REFOSC
30pF
30pF
30μA
VDDBB
VSSBB
VSSBB
Figure 5. REFOSC Pin
The REFOSC input circuit is shown in Figure 5. Input imped-
ance is 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 the VSS pin,
although a crystal may be used when greater frequency
accuracy is required. The nominal dc bias voltage on this pin
is 1.4V.
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| MICRF007BM | 功能描述:IC RECEIVER UHF LOW POWER 8SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數據傳輸率 - 最大:- 調制或協(xié)議:- 應用:* 電流 - 接收:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| MICRF007BM TR | 功能描述:IC RECEIVER UHF 300MHZ 8-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數據傳輸率 - 最大:- 調制或協(xié)議:- 應用:* 電流 - 接收:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| MICRF007YM | 功能描述:射頻接收器 300-440MHz Receiver, 1.2kbps, 1.7mA With Shutdown( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| MICRF007YM TR | 功能描述:射頻接收器 300-440MHz Receiver, 1.2kbps, 1.7mA With Shutdown( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| MICRF008 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio Sweep-Mode Receiver |
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