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参数资料
| 型号： | MICRF610TR |
| 厂商： | MICREL INC |
| 元件分类： | 通信及网络 |
| 英文描述： | 868-870 MHz ISM Band Transceiver Module |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, QMA16 |
| 封装： | 11.50 X 14.10 MM, MODULE-16 |
| 文件页数： | 4/20页 |
| 文件大小： | 698K |
| 代理商： | MICRF610TR |
Micrel, Inc.
MICRF610/MICRF610Z
July 2006
12
M9999-120205
Frequency Synthesizer
A6…A0
D7
D6
D5
D4
D3
D2
D1
D0
0001010
-
A0_5
A0_4
A0_3
A0_2
A0_1
A0_0
0001011
-
N0_11
N0_10
N0_9
N0_8
0001100
N0_7
N0_6
N0_5
N0_4
N0_3
N0_2
N0_1
N0_0
0001101
-
M0_11
M0_10
M0_9
M0_8
0001110
M0_7
M0_6
M0_5
M0_4
M0_3
M0_2
M0_1
M0_0
0001111
-
A1_5
A1_4
A1_3
A1_2
A1_1
A1_0
0010000
-
N1_11
N1_10
N1_9
N1_8
0010001
N1_7
N1_6
N1_5
N1_4
N1_3
N1_2
N1_1
N1_0
0010010
-
M1_11
M1_10
M1_9
M1_8
0010011
M1_7
M1_6
M1_5
M1_4
M1_3
M1_2
M1_1
M1_0
The frequency synthesizer consists of a voltage-controlled
oscillator (VCO), a crystal oscillator, phase select
prescaler, programmable frequency dividers and a phase-
detector. The length of the N, M, and A registers are 12,
12 and 6 respectively. The N, M, and A values can be
calculated from the formula:
()
(
)
A
N
16
f
2
A
N
16
f
M
f
RF
VCO
XCO
PhD
+
×
=
×
+
×
=
,
M ≠ 0
1
≤ A < N
fPHD: Phase detector comparison frequency
fXCO: Crystal oscillator frequency
fVCO: Voltage controlled oscillator frequency
fRF: Input/output RF frequency
There are two sets of each of the divide factors (i.e. A0
and A1). Storing the ‘0’ and the ‘1’ frequency in the 0- and
the 1 registers respectively, does the 2-FSK. The receive
frequency must be stored in the ‘0’ registers.
Crystal Oscillator (XCO)
Adr
D7
D6
D5
D4
D3
D2
D1
D0
0001001
‘0’
‘1’
XCOtune4
XCOtune3
XCOtune2
XCOtune1
XCOtune0
The crystal oscillator is a reference for the RF output
frequency and the LO frequency in the receiver. It is
possible to tune the internal crystal oscillator by switching
in internal capacitance using 5 tune bits XCOtune4 –
XCOtun0. The benefit of tuning the crystal oscillator is to
eliminate the initial tolerance and the tolerance over
temperature and aging. By using the crystal tuning feature
the noise bandwidth of the receiver can be reduced and a
higher sensitivity is achieved.
When XCOtune4 –
XCOtune0 = 0 no internal capacitors are connected to the
crystal pins. When XCOtune4 – XCOtune0 = 1 all of the
internal capacitors are connected to the crystal pins.
Figure 5 shows the tuning range.
-45.0
-35.0
-25.0
-15.0
-5.0
5.0
15.0
25.0
35.0
45.0
55.0
0
4
8
121620242832
[XCO_tune value]
[ppm
]
Figure 5. XCO Tuning
The typical start up time for the crystal oscillator (default
XCO_tune=13) is ~750us. If more capacitance is added
(higher XCO_tune value), then the start-up time will be
longer.
To save current in the crystal oscillator start-up period, the
XCO is turned on before any other circuit block. When the
XCO has settled, rest of the circuit will be turned on. No
programming should be made during this period.
The current consumption during the prestart period is
approximately 280A.
VCO
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0000011
‘1’
‘0’
VCO_IB2 VCO_IB1 VCO_IB0 VCO_freq1 VCO_freq0
The VCO has no external components. It has three bit to
set the bias current and two bit to set the VCO frequency.
These five bits are set by the RF frequency, as follows:
RF freq.
VCO_IB2
VCO_IB1
VCO_IB0
VCO_freq1 VCO_freq0
868MHz
0
1
0
1
Table 7. VCO Bit Setting
The bias bit will optimize the phase noise, and the
frequency bit will control a capacitor bank in the VCO. The
tuning range the RF frequency versus varactor voltage is
dependent on the VCO frequency setting, and can be
shown in Figure 6.
相关PDF资料 |
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| MICRF610 | 868-870 MHz ISM Band Transceiver Module |
| MIK0-55S | 55 CONTACT(S), POLYETHYLENE, FEMALE, CIRCULAR CONNECTOR, CRIMP, RECEPTACLE |
| MIK0-7S | 7 CONTACT(S), POLYETHYLENE, FEMALE, CIRCULAR CONNECTOR, CRIMP, RECEPTACLE |
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