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參數資料
| 型號： | RFHCS362AG |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder with UHF ASK/FSK Transmitter |
| 中文描述： | 跳碼編碼器的超高頻ASK / FSK發(fā)射器 |
| 文件頁數： | 34/60頁 |
| 文件大?。?/td> | 502K |
| 代理商： | RFHCS362AG |
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rfHCS362G/362F
DS41189A-page 34
Preliminary
2002 Microchip Technology Inc.
6.6
Power Amplifier
The PLL output feeds the power amplifier (PA). The
open-collector differential output (ANT1, ANT2) can be
used to drive a loop antenna directly or converted to
single-ended output via an impenance matching net-
work or balanced-to-unbalanced (balun) transformer.
Pins ANT1 and ANT2 are open-collector outputs and
must be pulled-up to V
DDRF
through the load.
The differential output of the PA should be matched to
an impedance of 800 to 1000
.
Failure to match the
impedance may cause excessive spurious and har-
monic emissions. For more information see Application
Note AN831, Matching Small Loop Antennas to rfPIC
Devices.
The transmit output power can be adjusted in six dis-
crete steps from +2 dBm to -12 dBm by varying the volt-
age (V
PS
) at the PS/DATA
ASK
pin. Figure 6-5 shows an
example voltage divider network for ASK operation and
Figure 6-6 for FSK operation.
For FSK operation, the PS/DATA
ASK
pin only serves as
a Power Select (PS) pin. An internal 20
μ
A current
source pushes current through the PS/DATA
ASK
pin
resulting in a voltage drop across resistor R2 at the V
PS
level selected for transmitter output power. V
PS
selects
the PA bias current. Higher transmit power will draw
higher current.
For ASK operation, the function of the PS/DATA
ASK
pin
is to turn the Power Amplifier (PA) on and off. Resistors
R1 and R2 form a voltage divider network to apply volt-
age V
PS
for the selected transmitter output power. If
maximum transmitter output is desired, the output of a
GP0 pin can be connected directly to PS/DATA
ASK
.
Table 6-6 lists typical values for R1 and R2 for both the
ASK and FSK modes.
.
FIGURE 6-5:
EXAMPLE ASK POWER
SELECT CIRCUIT
FIGURE 6-6:
EXAMPLE FSK POWER
SELECT CIRCUIT
TABLE 6-6:
POWER SELECT
(1)
Note:
PS/DATA
ASK
is driven low when RFEN
IN
= 0.
Make sure external circuitry on PS/DATA
ASK
does not conflict by driving the pin high. The
encoder DATA output works because it is low if
RFEN
OUT
is low
PS/DATA
ASK
rfHCS362G/362F
R2
R1
DATA IN
V
PS
20
μ
A
To power
select
circuitry
PS/DATA
ASK
rfHCS362G/362F
R2
V
PS
20
μ
A
To power
select
circuitry
Transmitter
Output Power
(dBm)
Transmitter
Operating Current
(mA)
Power Select (PS)
Voltage V
PS
(Volts)
(2)
ASK
FSK
R1 (
)
R2 (
)
(3)
R2 (
)
+2
-1
-4
-7
-10
-12
-60
11.5
8.6
7.3
6.2
5.3
4.8
<4.8
≥
2.0
1.2
0.9
0.7
0.5
0.3
<0.1
2400
6800
11K
15K
24K
43K
OPEN
4700
4700
4700
4700
4700
4700
4700
≥
75K
56K
47K
39K
27K
15K
4700
Note 1:
Standard Operating Conditions (unless otherwise stated) T
A
= 25°C, RF
EN
= 1,
V
DDRF
= 3V, f
TRANSMIT
= 433.92 MHz
2:
V
PS
is actual voltage on PS/DATA
ASK
pin.
3:
The Power Select circuitry contains an internal 20
μ
A current source. To ensure that the transmitter output
power is at the minimum when transmitting a DATA
ASK
= 0 (V
SSRF
), select the value of resistor R2 such
that the voltage drop across it is less than 0.1 volts.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| RFHCS362F | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Code Hopping Encoder with UHF ASK/FSK Transmitter |
| RFHCS362F-I/SS | 功能描述:編碼器、解碼器、復用器和解復用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| RFHCS362FT-I/SS | 功能描述:編碼器、解碼器、復用器和解復用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| RFHCS362G | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Code Hopping Encoder with UHF ASK/FSK Transmitter |
| RFHCS362G/362F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MCP23016 Datasheet |
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