MAX2839ETN+ Maxim Integrated Products, MAX2839ETN+ Datasheet - Page 20

• Manufacturer Part Number: MAX2839ETN+
• Description: RF Transceiver 2.3Ghz To 2.7Ghz MIM O Wireless Broadband
• Manufacturer: Maxim Integrated Products

Specifications of MAX2839ETN+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
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.
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.
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
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
Table 1. Operating Mode
20
Shutdown
Clock-Out Only
Clock-Out Only
Standby
Rx (1x2 MIMO)
Rx (1x1 SISO)
Tx
Tx Calibration
RxA Calibration
(Loopback)
RxB Calibration
(Loopback)
______________________________________________________________________________________
MODE
ENABLE
MODE CONTROL LOGIC INPUTS
PIN
X
0
1
0
1
1
1
1
1
1
Detailed Description
RXTX
PIN
0
X
1
1
1
1
0
0
1
1
Modes of Operation
REG1
D<3>
SPI
X
X
X
X
X
X
1
0
0
1
Shutdown Mode
Clock-Out Only
Standby Mode
D<1:0>
REG16
SPI
XX
X0
X0
01
01
01
01
11
11
11
Rx PATH
On (RxA)
(except
(except
LNA)
LNA)
Off
Off
Off
On
On
Off
Off
On
Off
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.
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.
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.
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.
On (except
On (except
On (except
PA driver)
PA driver)
PA driver)
Tx PATH
Off
Off
Off
Off
Off
Off
On
CIRCUIT BLOCK STATES
PLL, VCO, LO
On or Off
GEN
Off
Off
Off
On
On
On
On
On
On
Transmitter (Tx) Calibration Mode
AM detector + Rx
CALIBRATION
SECTIONS ON
Receive (Rx) Mode
I, Q buffers
Loopback
Loopback
None
None
None
None
None
None
None
Transmit (Tx) Mode
OUTPUT
CLOCK
Off
On
On
On
On
On
On
On
On
On