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2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
Table 1. Operating Mode
MODE CONTROL LOGIC INPUTS
CIRCUIT BLOCK STATES
MODE
Shutdown
Clock-Out Only
Clock-Out Only
Standby
Rx (1x2 MIMO)
Rx (1x1 SISO)
Tx
Tx Calibration
RxA Calibration
(Loopback)
RxB Calibration
(Loopback)
ENABLE
PIN
0
1
X
0
1
1
1
1
1
1
RXTX
PIN
0
X
1
1
1
1
0
0
1
1
SPI
REG1
D<3>
X
X
X
X
1
0
X
X
0
1
SPI
REG16
D<1:0>
XX
X0
X0
01
01
01
01
11
11
11
Rx PATH
Off
Off
Off
Off
On
On (RxA)
Off
Off
On
(except
LNA)
On
(except
LNA)
Tx PATH
Off
Off
Off
Off
Off
Off
On
On (except
PA driver)
On (except
PA driver)
On (except
PA driver)
PLL, VCO, LO
GEN
Off
Off
Off
On or Off
On
On
On
On
On
On
CALIBRATION
SECTIONS ON
None
None
None
None
None
None
None
AM detector + Rx
I, Q buffers
Loopback
Loopback
CLOCK
OUTPUT
Off
On
On
On
On
On
On
On
On
On
Detailed Description
Modes of Operation
The modes of operation for the MAX2839 are shutdown,
clock-out only, standby, receive, transmit, transmitter
calibration and receiver calibration. See Table 1 for a
summary of the modes of operation. When the parts are
active, various blocks can be shutdown individually by
programming different SPI registers.
Shutdown Mode
The MAX2839 features a low-power shutdown mode. In
shutdown mode, all circuit blocks are powered down,
except the 4-wire serial bus and its internal programma-
ble registers.
Clock-Out Only
In clock-out mode, the entire transceiver is off except
the divided reference clock output on the CLKOUT pin
and the clock divider, which remains on.
Standby Mode
The standby mode is used to enable the frequency
synthesizer block while the rest of the device is pow-
ered down. In this mode, PLL, VCO, and LO generator
are on so that Tx or Rx modes can be quickly enabled
from this mode. These and other blocks can be selec-
tively enabled in this mode by programming different
SPI registers.
Receive (Rx) Mode
In receive mode, all Rx circuit blocks are powered on
and active. Antenna signal is applied; RF is downcon-
verted, filtered, and buffered at Rx BB I and Q outputs.
Either receiver A or both receivers can be enabled.
Receiver B cannot be enabled by itself.
Transmit (Tx) Mode
In transmit mode, all Tx circuit blocks are powered on.
The external PA is powered on after a programmable
delay using the on-chip PA bias DAC.
Transmitter (Tx) Calibration Mode
All Tx circuit blocks except PA driver and external PA
are powered on and active. The AM detector and
receiver I/Q channel buffers are also ON, along with
multiplexers in receiver side to route this AM detector’s
signal to each I and Q differential outputs.
20
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