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5GHz Receiver
Pin Description (continued)
PIN
53
55
60
—
NAME
XTAL
ENABLE
V CC_BB1
EP
FUNCTION
Crystal Oscillator Base Input. AC-couple crystal unit to this pin.
Enable Logic Input
Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
Exposed Paddle. Connect to the ground plane with multiple vias for proper operation and heat
dissipation. Do not share with any other pin grounds and bypass capacitors’ ground.
Table 1. Operating Modes
MODE-CONTROL
LOGIC INPUTS
CIRCUIT BLOCK STATES
MODE
SHUTDOWN
CLKOUT
STANDBY
Rx
Tx CALIBRATION
RF LOOPBACK
BASEBAND
LOOPBACK
ENABLE PIN
0
1
1
1
1
1
1
SPI MAIN
ADDRESS 0,
D4:D2
XXX
000
001
010
100
101
11X
Rx PATH
Off
Off
Off
On
Off
On (except
LNA)
On (except
RXRF)
Tx PATH
Off
Off
Off
Off
On
On
Off
LO PATH
Off
Off
On
On
On
On
On
CLKOUT*
Off
On
On
On
On
On
On
Calibration
Sections On
None
None
None
None
AM detector
+ Rx I/Q buffers
RF loopback
Tx 4 baseband
buffer
* 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 MAX2852 are shutdown,
clockout, standby, receive, transmit calibration, 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 MAX2852 features a low-power shutdown mode. All
circuit blocks are powered down, except the 4-wire serial
bus and its internal programmable registers.
Clockout Mode
In clockout mode, only the crystal oscillator signal is
active at the CLKOUT pin. The rest of the transceiver is
powered down.
Standby Mode
In standby mode, PLL, VCO, and LO generation are on.
Rx mode can be quickly enabled from this mode. Other
blocks may be selectively enabled in this mode.
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 baseband I and Q
outputs.
Transmit Calibration
In transmit calibration mode, all Tx circuit blocks are
powered on and active. The AM detector and receiver
I/Q channel buffers are also on. Output signals are
routed to Rx baseband I and Q outputs.
______________________________________________________________________________________
17
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