5GHz, 4-Channel MIMO Transmitter
20 _____________________________________________________________________________________
Pin Description (continued)
Table 1. Operating Modes
Note 4: PA_BIAS pins may be kept active in nontransmit mode(s) by SPI programming.
Note 5: CLKOUT signal is active independent of SPI, and is only dependent on the ENABLE pin.
Detailed Description
Modes of Operation
The modes of operation for the MAX2850 are shutdown,
clockout, standby, receive, transmit, transmitter calibra-
tion, RF loopback, and baseband loopback. See Table 1
for a summary of the modes of operation. The logic input
pin ENABLE (pin 55) and SPI Main address 0 D4:D2
control the various modes.
Shutdown Mode
The MAX2850 features a low-power shutdown mode. All
circuit blocks are powered down, except the 4-wire serial
bus and its internal programmable registers.
PIN
NAME
FUNCTION
56
TXBBI2+
Transmitter 2 Baseband I-Channel Differential Input
57
TXBBI2-
58
TXBBQ2+
Transmitter 2 Baseband Q-Channel Differential Input
59
TXBBQ2-
60
V
CC_BB1
Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
61
TXBBI1+
Transmitter 1 Baseband I-Channel Differential Input
62
TXBBI1-
63
TXBBQ1+
Transmitter 1 Baseband Q-Channel Differential Input
64
TXBBQ1-
65
PA_DET1
External Power-Amplifier Detector Mux Input 1
66
TXRF1+
Transmitter 1 Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.
67
TXRF1-
68
PA_BIAS1
External Power-Amplifier Voltage Bias Output 1
EP
Exposed Pad. Connect to the ground plane with multiple vias for proper operation and heat dissipa-
tion. Do not share with any other pin grounds and bypass capacitors ground.
MODE CONTROL
LOGIC INPUTS
CIRCUIT BLOCK STATES
MODE
ENABLE
PIN
SPI MAIN
ADDRESS 0,
D4:D2
Rx PATH
Tx PATH
(Note 4)
LO PATH
CLKOUT
(Note 5)
Calibration
Sections On
SHUTDOWN
0
XXX
Off
Off
Off
Off
None
CLKOUT
1
000
Off
Off
Off
On
None
STANDBY
1
001
Off
Off
On
On
None
Rx
1
010
On
Off
On
On
None
Tx
1
011
Off
On
On
On
None
Tx CALIBRATION
1
100
Off
On
On
On
AM detector
+ Rx I/Q buffers
RF LOOPBACK
1
101
On (except LNA)
On
On
On
RF loopback
BASEBAND
LOOPBACK
1
11X
On (except RXRF)
Off
On
On
Tx 4 baseband
buffer
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