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參數(shù)資料
| 型號(hào)： | RF2908 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | 915MHZ SPREAD SPECTRUM RECEIVER WITH PLL FREQUENCY SYNTHESIZER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 534K |
| 代理商： | RF2908 |
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11-87
RF2908
Rev C1 010904
11
T
Parameter
Specification
Typ.
Unit
Condition
Min.
Max.
IF and Data Amplifiers
IF Frequency Range
Voltage Gain
Noise Figure
Note 1
77
9.6
83
MHz
dB
dB
dB
dBm
dBm
mV
dB
V
dB/mV
mV
PP
V
V
PP
dB
V
80
5
35
-65
+2
0
70
At maximum gain setting
At minimum gain setting
At maximum gain setting
At minimum gain setting
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
25
65
1.2
2.0
-0.08
500
1.7
1.64
60
0.5 to 2.4
1
Driving a 5k
load
At maximum gain setting
Maximum RSSI is 2.5V or V
CC
-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.
55
1.5
2
2.5
k
Filters
Characteristics
Five pole Bessel
Five pole Bessel internal LPF.
Three pole external LPF.
Selectable from 1, 2, 4, and 8MHz. Refer to
“IF Bandwidth Response” chart.
Bandwidth
1, 2, 4, 8
MHz
Passband Ripple
Group Delay
1
dB
ns
100
At 8MHz, increasing as bandwidth
decreases.
Ultimate Rejection
Data Amplifiers
Voltage Gain
Bandwidth
Rise and Fall Time
Logic High Output
80
100
dB
100
dB
MHz
ns
V
10
2
5
V
CC
-0.3V
Can sink/source 1mA and maintain these
logic levels.
Can sink/source 1mA and maintain these
logic levels.
Logic Low Output
0.3
V
PLL, Synthesizer, VCO and
LO
VCO Tuning Range
VCO Sensitivity
Charge Pump Current
Reference Frequency Crystal
Reference Crystal Rs
Phase Noise
800 to 1200
30
100
9.6
60
-66
-96
-10
1.5
300
MHz
MHz/V
μ
A
MHz
dBc/Hz
dBc/Hz
dBm
ms
kHz
20
40
Determined by external resistor.
KPD=100
μ
A/2
π
=0.0159ma/2
π
rad
20
80
10kHz offset.
100kHz offset.
Into 100
differential load
From sleep mode.
86 channels in the 902MHz to 928MHz ISM
band.
LO Output Level
Lock Time
Step Size
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