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2-3
RF2938
Rev A8 010418
11
Parameter
Specification
Unit
Condition
Min.
Typ.
Max.
Data Amplifiers
Bandwidth
40
MHz
Gain (Limiting mode)
60
dB
Open Loop.
Rise and Fall Time
2
5
ns
5pF load.
Logic High Output
VCC-0.3V
VCC
V
Source Current 1mA
Logic Low Output
0.3
V
Sink Current 1mA.
Hysteresis
30
mV
Transmit Modulator and
LPF
Filter Gain
0
dB
Any setting
Baseband Filter 3dB Bandwidth
1
35
MHz
5th order Bessel LPF, Set by BW CTRL
Passband Ripple
0.1
dB
Group Delay
15
ns
At 35MHz, increasing as bandwidth
decreases.
Group Delay
400
ns
At 2MHz.
Ultimate Rejection
> 80
dB
Input Impedance
3
k
Ω
Single ended
Input AC Voltage
200
mVp-p
Linear, Single ended.
Input DC Offset Requirement
1.6
1.7
1.8
V
For correct operation.
IF Frequency Range
45
500
MHz
Output Impedance
2
k
Ω
Open Collector when TX on, hi-Z when off
I/Q Phase Balance
±2
±5
I/Q Gain Balance
0.5±0.25
1.0
dB
Conversion Voltage Gain
1.1
V/V
With Current Combination into 50
Ω single-
ended load
Output P1dB
-6
dBm
With Current Combination into 50
Ω single-
ended load
Carrier Output
-30
dBm
Without external offset adjustments.
280MHz
Harmonic Outputs
-30
dBc
Transmit VGA and
Upconverter
VGA Gain Range
17
dB
VGA Input Voltage Range
1.0 to 2.0
V
Positive Slope
VGA Gain Sensitivity
17
dB/V
VGA Input Impedance
230-j400
Ω
280MHz
75-j350
Ω
374MHz
RF Mixer Output Impedance
50
Ω
With matching elements.
VGA/Mixer Conversion Gain
+10 to +27
dB
With 50
Ω match on the output.
VGA/Mixer Output Power
-9
dBm
1dB compression - Single Side Band,
TX GC= 1.0V
VGA/Mixer Output Power
-4
dBm
1dB compression - Single Side Band,
TX GC= 2.0V
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