CMX991 Datasheet, PDF (50/56 Pages) CML Microcircuits – Two-mode demodulator

RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
IF Amplifier and I/Q Demodulator
Gain
Noise Figure
Third Order Intercept Point (Input)
Input Frequency Range
LO Frequency Range
Input Impedance
Output Impedance
LO Leakage at Input
1dB Compression Point
VGA Control Range
VGA Step Size
VGA Response Time
Image Rejection (I/Q Gain/Phase matching)
I/Q Output Bandwidth (-3dB)
1MHz Mode
100kHz Mode
Notes
10, 17
10, 11
10, 17
12
15
13
14
E
16
Min.
–
–
–
10
40
–
–
–
–
–
4
–
30
1
100
Typ.
43
13
-20
–
–
1800
20
–
-25
48
6
–
40
1.4
135
Max.
–
–
–
150
600
–
–
-27
–
–
8
10
–
Units
dB(V/V)
dB
dBm
MHz
MHz
Ω
Ω
dBm
dBm
dB
dB
µs
dB
–
MHz
–
kHz
Notes:
10. Measured from an un-matched 50Ω input source to a differential I or Q output voltage; test
frequency = 45MHz. Note that values include combined response of IF amplifier, I/Q
demodulator and I/Q filter stages; see also section 7.7 for further details.
11. At maximum VGA setting (0dB); see section 7.7 for further details.
12. LO Supplied at four times the IF frequency.
13. At maximum gain, input terminated with 50Ω resistor.
14. Eight VGA steps.
15. Based on single ended input at 45MHz.
16. In 1MHz output mode an IF output in the range 450kHz to 465kHz is supported.
17. Gain reduces at higher IFs.
I/Q Filters
Gain
Noise Figure
Third Order Intercept Point (Input)
Output Impedance
Output Anti-alias Filter Stop-band
Stop-band Attenuation
Data Filter Bandwidth (-3dB)
Differential Output Voltage Swing
Notes
20
20
20
20
21
Min.
–
–
–
–
1.92
55
–
–
Typ.
N/A
N/A
N/A
N/A
–
–
100
–
Max.
–
–
–
–
–
–
–
4
Units
dB(V/V)
dB
dBm
Ω
MHz
dB
kHz
Vp-p
Notes:
20. Performance included in overall performance of I/Q Demodulator.
21. This is the maximum swing to guarantee meeting the third order distortion characteristics
under the specified conditions and is not the maximum limiting value. For clarity, this
means that the device has the capability to produce +/-1V on each of the differential
outputs. The outputs are capable of driving a load resistance across the differential
outputs of 1kΩ. This voltage output capability provides easy interfacing to other CML
devices, like the CMX981, which has a maximum input signal amplitude of 2.4Vp-p.
 2015 CML Microsystems Plc
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