CMX972 Datasheet, PDF (38/41 Pages) CML Microcircuits – Small 32-lead VQFN Package

Quadrature Demodulator with IF PLL/VCO
CMX972
8.1.3.3 AC Parameters – Demodulator
For the following conditions unless otherwise specified:
V_CC = V_CCSYNTH = V_DD = 3.3V; V_RFGND = V_SS = 0V. RXLO Level = -10dBm and T_AMB = +25ºC.
IF Amplifier and
Quadrature Demodulator
Gain
Noise Figure
Input Third Order Intercept Point
Input Frequency Range
RXLO Frequency Range
Input Impedance
Output Impedance
Output Load
Resistance (differential)
Capacitance per Pin
Differential Output Voltage
Output Common Mode Voltage
RXLO Leakage at Input
Input 1dB Compression Point
VGA Control Range
VGB Control Range
VGA and VGB Step Size
I/Q Gain Matching Error
I/Q Phase Matching Error
I/Q Output Bandwidth (-3dB)
Notes
30,31
30,31
30,34
31
Min.
–
–
–
20
40
–
–
Typ.
56
10
-15
–
–
1000
200
Max.
–
–
–
300
600
–
–
Units
dB(V/V)
dB
dBm
MHz
MHz
Ω
Ω
33
33
33
30, 34,35
32
32
33
10
–
2
V_CC – 1.9
–
–
–
–
4
–
–
5
–
–
–
V_CC – 1.7
-80
-41
18
30
6
0.1
0.1
10
–
10
–
V_CC – 1.5
-40
–
–
–
8
0.5
1
–
kΩ
pF
Vp-p
V
dBm
dBm
dB
dB
dB
dB
degree
MHz
Notes:
30.
31.
32.
33.
34.
35.
Measured from an unmatched 50Ω input source to a differential I or Q output voltage; test
frequency = 45MHz. Note that values include combined response of IF amplifier, quadrature
demodulator and I/Q amplifier stages; at maximum VGA and VGB setting (0dB).
See also section 7.1.
Four VGA steps and six VGB steps, see Rx Control Register, section 6.3.1.
Differential Output Voltage is achieved with default output drive setting (register $1C, b7=’0’,
see section 6.3.1), for given output load and for at least the minimum I/Q output bandwidth;
typical I/Q output bandwidth is achieved with increased drive capability selected (register $1C,
b7=’1’, see section 6.3.1) and with the same output load specification.
With increased output drive setting (register $1C, b7=’1’).
With IMD5 – IMD0 (b7 – b2 of register $2F) set to ‘111111’
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