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CMX991 Datasheet(PDF) 9 Page - CML Microcircuits

Part No. CMX991
Description  Two-mode demodulator
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
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CMX991 Datasheet(HTML) 9 Page - CML Microcircuits

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RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
 2015 CML Microsystems Plc
9
D/991_992/20
Package
Q3
Pin No.
Pin Name
(CMX991)
Pin Name
(CMX992)
Signal
Type
Description
36
VDDIO
VDDIO
Power
Supply to C-BUS circuits
37
LNAON
LNAON
O/P
Control line to enable/disable Rx LNA
38
VCCSYNTH
VCCSYNTH
Power
Supply to IF integer N PLL
39
FREF
FREF
I/P
Reference frequency input
40
DOIF
DOIF
O/P
IF PLL charge pump output
41
VCOP
VCOP
I/P
IF PLL VCO positive input
42
VCON
VCON
I/P
IF PLL VCO negative input
43
VBIAS
VBIAS
O/P
Bandgap generated bias voltage
– measurement
output
44
TXQP
(Note 2)
NC
I/P
CMX991: TxQ positive input
NC
CMX992: Do not connect to this pin, reserved for
future use
45
TXQN
(Note 2)
NC
I/P
CMX991: TxQ negative input
NC
CMX992: Do not connect to this pin, reserved for
future use
46
TXIN
NC
I/P
CMX991: TxI negative input
NC
CMX992: Do not connect to this pin, reserved for
future use
47
TXIP
NC
I/P
CMX991: TxI positive input
NC
CMX992: Do not connect to this pin, reserved for
future use
48
TXIFOUT
NC
O/P
CMX991: Tx IF output
NC
CMX992: Do not connect to this pin, reserved for
future use
EXPOSED
METAL PAD
AGND
AGND
Power
The exposed metal pad must be electrically
connected to analogue ground
Total = 49 Pins (48 pins and central, exposed metal ground pad)
Table 1 Pin List
Notes:
1) I/P = Input
O/P = Output
T/S = 3-state
NC = Not Connected
2) In versions of the datasheet before D/991_992/13 these pins were incorrectly referenced as pin
44 = TXQN and pin 45 = TXQP causing a spectrum inversion at the modulator output.
3.1
Signal Definitions
Signal Name
Pins
Usage
AVDD
VCCIF, VCCRF, VCCSYNTH
Power supply for analogue circuits.
DVDD
DVDD
Power supply for digital circuits.
VDDIO
VDDIO
Power supply voltage for digital interface
(C-BUS).
VBIAS
VBIAS
Bandgap generated bias voltage used
as a reference for differential amplifier
stages. Decoupling is optional but, if
used, a capacitor of >200nF should be
connected between VBIAS and AVSS.
DVSS
DGND
Ground for digital circuits.
AVSS
AGND
Ground for analogue circuits.
Table 2 Definition of Power Supply and Reference Voltages


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