CMX991 Datasheet, PDF (9/56 Pages) CML Microcircuits – Two-mode demodulator

RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
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)
I/P CMX991: TxQ positive input
NC
NC
CMX992: Do not connect to this pin, reserved for
future use
45
TXQN
(Note 2)
I/P CMX991: TxQ negative input
NC
NC
CMX992: Do not connect to this pin, reserved for
future use
I/P CMX991: TxI negative input
46
TXIN
NC
NC
CMX992: Do not connect to this pin, reserved for
future use
I/P CMX991: TxI positive input
47
TXIP
NC
NC
CMX992: Do not connect to this pin, reserved for
future use
O/P CMX991: Tx IF output
48
TXIFOUT
NC
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
T/S = 3-state
O/P = Output
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
AV_DD
DV_DD
V_DDIO
V_BIAS
DV_SS
AV_SS
Pins
VCCIF, VCCRF, VCCSYNTH
DVDD
VDDIO
VBIAS
DGND
AGND
Usage
Power supply for analogue circuits.
Power supply for digital circuits.
Power supply voltage for digital interface
(C-BUS).
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 V_BIAS and AV_SS.
Ground for digital circuits.
Ground for analogue circuits.
Table 2 Definition of Power Supply and Reference Voltages
 2015 CML Microsystems Plc
9
D/991_992/20