MAX2850ITK+ Maxim Integrated Products, MAX2850ITK+ Datasheet - Page 20

• Manufacturer Part Number: MAX2850ITK+
• Description: RF Transmitter 5GHz, 4-Ch MIMO Tran smitter WLAN 802.11a
• Manufacturer: Maxim Integrated Products

Specifications of MAX2850ITK+

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

5GHz, 4-Channel MIMO Transmitter
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.
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
20
Tx CALIBRATION
PIN
RF LOOPBACK
56
57
58
59
60
61
62
63
64
65
66
67
68
—
SHUTDOWN
LOOPBACK
BASEBAND
_____________________________________________________________________________________
STANDBY
CLKOUT
MODE
Rx
Tx
TXBBQ2+
TXBBQ1+
PA_BIAS1
PA_DET1
TXBBQ2-
TXBBQ1-
TXBBI2+
V
TXBBI1+
TXBBI2-
TXBBI1-
TXRF1+
TXRF1-
NAME
CC_BB1
EP
Detailed Description
ENABLE
MODE CONTROL
PIN
Transmitter 2 Baseband I-Channel Differential Input
Transmitter 2 Baseband Q-Channel Differential Input
Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
Transmitter 1 Baseband I-Channel Differential Input
Transmitter 1 Baseband Q-Channel Differential Input
External Power-Amplifier Detector Mux Input 1
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.
External Power-Amplifier Voltage Bias Output 1
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.
LOGIC INPUTS
0
1
1
1
1
1
1
1
Modes of Operation
ADDRESS 0,
SPI MAIN
D4:D2
XXX
11X
000
001
010
011
100
101
On (except RXRF)
On (except LNA)
Rx PATH
Off
Off
Off
On
Off
Off
pin ENABLE (pin 55) and SPI Main address 0 D4:D2
control the various modes.
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.
FUNCTION
Tx PATH
(Note 4)
Off
Off
Off
Off
On
On
On
Off
CIRCUIT BLOCK STATES
Pin Description (continued)
LO PATH
Off
Off
On
On
On
On
On
On
CLKOUT
(Note 5)
Off
On
On
On
On
On
On
On
Shutdown Mode
+ Rx I/Q buffers
Tx 4 baseband
RF loopback
Sections On
AM detector
Calibration
buffer
None
None
None
None
None