Datasheet

MAX2831/MAX2832
2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(MAX2831 EV kit: V
CC_
= 2.7V to 3.6V, V
CCPA
= V
CCTXPA
= 2.7V to 4.2V, T
A
= -40°C to +85°C, Rx set to the maximum gain. CS =
high, RXHP = SCLK = DIN = low, RSSI and clock output buffer are off, no signal at RF inputs, all RF inputs and outputs terminated
into 50Ω, receiver baseband outputs are open. 100mV
RMS
differential I and Q signals (54Mbps IEEE 802.11g OFDM) applied to I/Q
baseband inputs of transmitter in transmit mode, f
REF
= 40MHz, and registers set to recommended settings and corresponding test
mode, unless otherwise noted. Typical values are at V
CC
= 2.8V, V
CCPA
= 3.3V, and T
A
= +25°C, LO frequency = 2.437GHz, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)
PARAMETERS CONDITIONS MIN TYP MAX UNITS
LOGIC INPUTS: SHDN, RXTX, SCLK, DIN, CS, B7:B1, RXHP
Digital Input-Voltage High, V
IH
V
CC
-
0.4
V
Digital Input-Voltage Low, V
IL
0.4 V
Digital Input-Current High, I
IH
-1 +1 µA
Digital Input-Current Low, I
IL
-1 +1 µA
LOGIC OUTPUTS: LD, CLOCKOUT
Digital Output-Voltage High, V
OH
Sourcing 100µA
V
CC
-
0.4
V
Digital Output-Voltage Low, V
OL
Sinking 100µA 0.4 V
AC ELECTRICAL CHARACTERISTICS—Rx Mode
(MAX2831 EV kit: V
CC_
= 2.8V, V
CCPA
= V
CCTXPA
= 3.3V, T
A
=+25°C, f
RF
= 2.439GHz, f
LO
= 2.437GHz; receiver baseband I/Q out-
puts at 112 mV
RMS
(-19dBV), f
REF
= 40MHz, SHDN = CS = high, RXTX = SCLK = DIN = low, with power matching for the differential
RF pins using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
RECEIVER SECTION: LNA RF INPUT-TO-BASEBAND I/Q OUTPUTS
RF Input Frequency Range 2.4 2.5 GHz
High RF gain 18
Mid RF gain 11
RF Input Return Loss
Low RF gain 14
dB
T
A
= +25°C 86 98
Maximum gain, B7:B1 =
1111111
T
A
= -40°C to +85°C 83
Total Voltage Gain
Minimum gain, B7:B1 =
0000000
T
A
= +25°C 3 8
dB
From high-gain mode (B7:B6 = 11) to medium-gain
mode (B7:B6 = 10)
-16
RF Gain Steps (Note 3)
From high-gain mode (B7:B6 = 11) to low-gain mode
(B7:B6 = 0X)
-33
dB
RF Gain-Change Settling Time
Gain change from high gain to medium gain, high gain to
low, or medium gain to low gain; gain settling to within
±2dB of steady state; RXHP = 1
0.2 µs