RF2948B RF Micro Devices, RF2948B Datasheet - Page 3

• Manufacturer Part Number: RF2948B
• Description: 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
• Manufacturer: RF Micro Devices

Rev A6 040930
Transmit Modulator and
LPF
Filter Gain
Baseband Filter 3dB Bandwidth
Passband Ripple
Group Delay
Group Delay
Ultimate Rejection
Input Impedance
Input AC Voltage
Input P1dB
Input DC Offset Requirement
IF Frequency Range
Differential Output Resistance
Differential Output Capacitance
Shunt Output Capacitance
I/Q Phase Balance
I/Q Gain Balance
Conversion Transconductance
Carrier Output
Harmonic Outputs
Transmit VGA and
Upconverter
VGA Gain Range
VGA Control Voltage Range
VGA Gain Sensitivity
VGA Input Impedance
RF Mixer Output Impedance
VGA/Mixer Conversion Gain
VGA/Mixer Output Power
VGA/Mixer Output Power
Parameter
Min.
200
1.6
-18
45
1
3
Specification
1.0 to 2.0
515-j994
-3 to +14
0.0185
Typ.
0.436
>80
400
100
1.7
0.4
-26
-30
15
22
17
17
50
-9
-4
0
0
0
Max.
500
0.1
1.8
35
±3
±1
mV
mV
Unit
MHz
MHz
dB/V
dBm
dBm
dBc
dBc
dB
dB
dB
kΩ
kΩ
dB
dB
dB
pF
pF
ns
ns
V
S
V
Ω
Ω
p-p
p-p
Any setting
At 35MHz, increasing as bandwidth
decreases.
At 2MHz.
Single-ended
Linear, Single-ended.
Single-ended.
For correct operation.
Between output pins. Open collector when
TX on, Hi Z when TX off
Between output pins.
From each pin to ground.
Single-ended voltage input to differential out-
put current conversion gain.
Without external offset adjustments.
374MHz. Compared to modulated signal,
100mV
Positive Slope
374MHz
With matching elements.
With 50Ω match on the output.
1dB compression - Single Sideband,
TX GC=1.0V. (Desired signal power)
1dB compression - Single Sideband,
TX GC=2.0V. (Desired signal power)
5th order Bessel LPF, Set by BW CTRL
P-P
input.
Condition
RF2948B
11-241