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