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2.3GHz to 2.7GHz MIMO Wireless
BroadbandRF Transceiver
Table 1. Operating Mode
MODE CONTROL LOGIC INPUTS
CIRCUIT BLOCK STATES
MODE
ENABLE TXRX
PIN PIN
SPI
REG1
D<3>
SPI
REG16
D<1:0>
Rx PATH
Tx PATH
PLL, VCO, LO
GEN
CALIBRATION
SECTIONS ON
CLOCK
OUTPUT
Shutdown
Clock-Out Only
Clock-Out Only
Standby
Rx (1x2 MIMO)
Rx (1x1 SISO)
Tx
Tx Calibration
RX_A
Calibration
(Loopback)
RX_B
Calibration
(Loopback)
0
1
X
0
1
1
1
1
1
1
0
X
1
1
1
1
0
0
1
1
X
X
X
X
1
0
X
X
0
1
XX
X0
X0
01
01
01
01
11
11
11
Off
Off
Off
Off
On
On (RX_A)
Off
Off
On
(except
LNA)
On
(except
LNA)
Off
Off
Off
Off
Off
Off
On
On (except
PA driver)
On (except
PA driver)
On (except
PA driver)
Off
Off
Off
On or Off
On
On
On
On
SPI REG7D<7> = 1
On
SPI REG26D<3> = 1
On
SPI REG26D<3> = 1
None
None
None
None
None
None
None
AM detector + Rx
I, Q buffers
Loopback
Loopback
Off
On
On
On
On
On
On
On
On
On
Detailed Description
Modes of Operation
The modes of operation for the MAX2839AS are shut-
down, clock-out only, standby, receive, transmit, trans-
mitter 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 indi-
vidually by programming different SPI registers.
Shutdown Mode
The MAX2839AS 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 remain 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, the PLL, VCO, and LO gener-
ator are on so that Tx or Rx modes can be quickly
enabled from this mode. These and other blocks can
be selectively 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 the receiver side to route this AM detec-
tor’s signal to each I and Q differential outputs. When
required, the I/Q lowpass filter can be bypassed.
______________________________________________________________________________________
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