RF2908 查看數據表（PDF） - RF Micro Devices
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RF2908 Datasheet PDF : 18 Pages
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RF2908
Parameter
IF and Data Amplifiers
IF Frequency Range
Voltage Gain
Noise Figure
Input IP3
Output DC Offset
Gain Control Range
Gain Control Voltage Range
Gain Control Sensitivity
VGA Output Voltage
VGA DC Output Voltage
Output P1dB
RSSI Range
RSSI Output Voltage Compli-
ance
Input Impedance
Specification
Min.
Typ.
Max.
Note 1
9.6
77
80
83
5
35
-65
+2
0
25
65
70
1.2
2.0
-0.08
500
1.7
1
1.64
60
55
0.5 to 2.4
1.5
2
2.5
Filters
Characteristics
Five pole Bessel
Bandwidth
1, 2, 4, 8
Passband Ripple
1
Group Delay
100
Ultimate Rejection
Data Amplifiers
Voltage Gain
Bandwidth
Rise and Fall Time
Logic High Output
Logic Low Output
80
100
100
10
2
5
VCC - 0.3 V
0.3
PLL, Synthesizer, VCO and
LO
VCO Tuning Range
800 to 1200
VCO Sensitivity
20
30
40
Charge Pump Current
100
Reference Frequency Crystal
9.6
20
Reference Crystal Rs
60
80
Phase Noise
-66
-96
LO Output Level
-10
Lock Time
1.5
Step Size
300
Unit
Condition
MHz
dB
dB
dB
dBm
dBm
mV
dB
V
dB/mV
mVPP
V
VPP
dB
V
kΩ
MHz
dB
ns
dB
dB
MHz
ns
V
V
At maximum gain setting
At minimum gain setting
At maximum gain setting
At minimum gain setting
Driving a 5kΩ load
At maximum gain setting
Maximum RSSI is 2.5V or VCC-0.3, which-
ever is less.
Differential
Note 1. The lower cutoff frequency is a func-
tion of: a) input DC blocking cap size; b) DC
feedback capacitor; and, c) gain setting. But,
recommended component values will yield a
cutoff of <10kHz.
Five pole Bessel internal LPF.
Three pole external LPF.
Selectable from 1, 2, 4, and 8MHz. Refer to
“IF Bandwidth Response” chart.
At 8MHz, increasing as bandwidth
decreases.
Can sink/source 1mA and maintain these
logic levels.
Can sink/source 1mA and maintain these
logic levels.
MHz
MHz / V
µA
MHz
Ω
dBc / Hz
dBc / Hz
dBm
ms
kHz
Determined by external resistor.
KPD =100µA/2π=0.0159ma/2π rad
10kHz offset.
100kHz offset.
Into 100Ω differential load
From sleep mode.
86 channels in the 902MHz to 928MHz ISM
band.
11
Rev C1 010904
11-87
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