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參數資料
| 型號： | ADF7010 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Performance ISM Band ASK/FSK/GFSK Transmitter IC |
| 中文描述： | 高性能ISM頻段詢價/ FSK信號/發射器集成電路的GFSK |
| 文件頁數： | 15/20頁 |
| 文件大小： | 561K |
| 代理商： | ADF7010 |
REV. 0
ADF7010
–15–
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The on-board crystal oscillator circuitry (Figure 2), allows the
use of an inexpensive quartz crystal as the PLL reference. The
oscillator circuit is enabled by setting
XOE
low. It is enabled
by default on power-up and is disabled by bringing CE low.
Two parallel resonant capacitors are required for oscillation at
the correct frequency; the value of these is dependent on the
crystal specification. Errors in the crystal can be corrected using
the Error Correction register within the R Register. A single-
ended reference (TCXO, CXO) may be used. The CMOS
levels should be applied to OSC2, with
XOE
set high.
TO R COUNTER, AND
CLOCK OUT DIVIDE
BUFFER
SW1
100k
10pF
OSC2
NC
XTAL OSCILLATOR
DISABLED
10pF
OSC1
500k
100k
Figure 2. Oscillator Circuit on the ADF7010
CLK
OUT
DIVIDER AND BUFFER
The CLK
OUT
circuit takes the reference clock signal from the
oscillator section above and supplies a divided down 50:50
mark-space signal to the CLK
OUT
pin. An even divide from 2 to 30
is available. This divide is set by the 4 MSBs in the R register.
On power-up, the CLK
OUT
defaults to divide by 16.
CLK
OUT
DV
DD
OSC1
DIVIDER
1 TO 15
DIVIDE
BY 2
CLK
OUT
ENABLE BIT
Figure 3. CLK
OUT
Stage
The output buffer to CLK
OUT
is enabled by setting Bit DB4 in
the function register high. On power-up, this bit is set high. The
output buffer can drive up to a 20 pF load with a 10% rise time at
4.8 MHz. Faster edges can result in some spurious feedthrough
to the output. A small series resistor (50
W
) can be used to slow
the clock edges to reduce these spurs at F
CLK
.
R COUNTER
The 4-bit R Counter divides the reference input frequency by an
integer from 1 to 15. The divided down signal is presented as the
reference clock to the phase frequency detector (PFD). The divide
ratio is set in the R register. Maximizing the PFD frequency
reduces the N-value. This reduces the noise multiplied at a rate
of 20 log(N) to the output, as well as reducing occurrences of
spurious components. The R register defaults to R = 1 on power-up.
PRESCALER, PHASE FREQUENCY DETECTOR (PFD),
AND CHARGE PUMP
The dual-modulus prescaler (
P/P
+ 1) divides the RF signal
from the VCO to a lower frequency that is manageable by the
CMOS counters.
The PFD takes inputs from the R Counter and the N Counter
(
N
=
Int
+
Fraction
) and produces an output proportional to the
phase and frequency difference between them. Figure 4 is a
simplified schematic.
CP
D
E
U3
UP
CHARGE
PUMP
CPGND
V
P
N DIVIDER
HI
D2
Q2
CLR2
U2
DOWN
HI
D1
Q1
CLR1
U1
R DIVIDER
R DIVIDER
N DIVIDER
CP OUTPUT
Figure 4. PFD Stage
The PFD includes a delay element that sets the width of the
antibacklash pulse. The typical value for this in the ADF7010 is
3 ns. This pulse ensures that there is no dead zone in the PFD
transfer function and minimizes phase noise and reference spurs.
MUXOUT AND LOCK DETECT
The MUXOUT pin allows the user to access various internal
points in the ADF7010. The state of MUXOUT is controlled by
Bits M1 to M4 in the function register.
REGULATOR READY
This is the default setting on MUXOUT after the transmitter has
been powered up. The power-up time of the regulator is typically
50
m
s. Since the serial interface is powered from the regulator,
it is necessary for the regulator to be at its nominal voltage
before the ADF7010 can be programmed. The status of the regu-
lator can be monitored at MUXOUT. Once the REGULATOR
READY signal on MUXOUT is high, programming of the
ADF7010 may begin.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADF7010BRU | 制造商:Rochester Electronics LLC 功能描述:900 MHZ ISM TRANSMITTER I.C. - Bulk |
| ADF7010BRU-REEL7 | 制造商:Analog Devices 功能描述:IC,RF Modulator,TSSOP,24PIN,PLASTIC |
| ADF7010BRUZ | 功能描述:IC XMITTER ASK/FSK/GFSK 24TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 發射器 系列:- 標準包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應用:- 調制或協議:UHF，ASK 數據傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數據接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點:- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ADF7010BRUZ-REEL | 制造商:Rochester Electronics LLC 功能描述:900 MHZ ISM TRANSMITTER I.C. - Tape and Reel |
| ADF7010BRUZ-REEL7 | 功能描述:IC XMITTER ASK/FSK/GFSK 24TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 發射器 系列:- 標準包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應用:- 調制或協議:UHF，ASK 數據傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數據接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點:- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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