19-2884; Rev 0; 7/03
KIT
ATION
EVALU
BLE
AVAILA
2.4GHz 802.11b Zero-IF Transceiver
with Integrated PA and Tx/Rx Switch
General Description
Features
♦
2.4GHz to 2.5GHz ISM Band Operation
♦
802.11b (11Mbps CCK and 22Mbps PBCC) PHY
Compatible
♦
Integrated +17dBm PA
♦
Integrated PA Power Detector
♦
Integrated Transmit/Receive Switch
♦
Complete RF-to-Baseband Transceiver
Direct Up/Down Conversion
Monolithic Low-Phase-Noise VCO
Integrated Baseband Lowpass Filters
Integrated PLL with 3-Wire Serial Interface
Digital Bias Control for PA
Transmit Power Control
Receive Baseband AGC
Complete Baseband Interface
Digital Tx/Rx Mode Control
♦
-95dBm Rx Sensitivity at 1Mbps
♦
♦
♦
♦
-85dBm Rx Sensitivity at 11Mbps
Single +2.7V to +3.0V Supply
2µA Shutdown Mode
Very Small 48-Pin QFN Package
MAX2822
The MAX2822 single-chip transceiver is designed for
802.11b (11Mbps) applications operating in the 2.4GHz
to 2.5GHz ISM band. The transceiver includes all the
circuitry required to implement an 802.11b RF-to-base-
band transceiver solution, including the power amplifi-
er, transmit/receive switch, and 50Ω matching. The fully
integrated receive path, transmit path, VCO, frequency
synthesis, and baseband/control interface provide all
the required active RF circuitry. Only a small number of
passive components are needed to form the complete
radio front-end solution.
The IC eliminates the need for external IF SAW and RF
image-reject filters by utilizing a direct-conversion radio
architecture and monolithic baseband filters for both
receiver and transmitter. It is specifically optimized for
802.11b (11Mbps CCK) and 22Mbps PBCC™ applica-
tions. The baseband filtering and Rx and Tx signal
paths support the CCK modulation scheme for BER =
10
-5
at the required sensitivity levels.
The transceiver is suitable for the full range of 802.11b
data rates (1Mbps, 2Mbps, 5.5Mbps, and 11Mbps) as
well as the higher-rate 22Mbps PBCC standard. The
MAX2822 is available in the very small 7mm x 7mm 48-
lead QFN or thin QFN packages. The small solution size
makes it ideal for small form-factor 802.11b applications
such as PDAs, SmartPhones, and embedded modules.
Applications
802.11b PDAs and SmartPhones
802.11b Embedded Modules
802.11b PC Cards, Mini-PCI Cards
PART
MAX2822EGM
MAX2822ETM
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 QFN
48 Thin QFN
Pin Configuration/Functional Diagram appears at end of
data sheet.
PBCC is a trademark of Texas Instruments, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2.4GHz 802.11b Zero-IF Transceiver
with Integrated PA and Tx/Rx Switch
MAX2822
ABSOLUTE MAXIMUM RATINGS
V
CC
Pins to GND ...................................................-0.3V to +3.6V
RF I/O: RFP, RFN (current into pin).....................................50mA
Baseband Inputs: TX_BBIP, TX_BBIN, TX_BBQP,
TX_BBQN to GND ..................................-0.3V to (V
CC
+ 0.3V)
Baseband Outputs: RX_BBIP, RX_BBIN, RX_BBQP,
RX_BBQN to GND ..................................-0.3V to (V
CC
+ 0.3V)
Analog Inputs: RX_AGC, TX_GC, TUNE, ROSCN,
ROSCP to GND ......................................-0.3V to (V
CC
+ 0.3V)
Analog Outputs: PWR_DET, CP_OUT
to GND....................................................-0.3V to (V
CC
+ 0.3V)
Digital Inputs: RX_ON, TX_ON, SHDNB, CSB, SCLK,
DIN, RF_GAIN, RX_1K to GND...............-0.3V to (V
CC
+ 0.3V)
Bias Voltages: RBIAS, BYP ..................................+0.9V to +1.5V
Short-Circuit Duration Digital Output: DOUT ..........................10s
RF Input Power ...............................................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
48-Lead QFN (derate 27.0mW/°C
above +70°C) ......2162mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(MAX2822 EV kit: V
CC
= +2.7V to +3.0V, RF_GAIN = V
IH
, 0V
≤
V
TX_GC
≤
+2.0V, 0V
≤
V
RX_AGC
≤
+2.0V, R
BIAS
= 12kΩ, no input sig-
nals at RF and baseband inputs, RF I/O terminated into 50Ω though a 2:1 balun, receiver baseband outputs are open, transmitter
baseband inputs biased at +1.2V, registers set to default power-up settings, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are for V
CC
= +2.7V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETERS
Supply Voltage
Shutdown Current
Standby-Mode Supply Current
Receive-Mode Supply Current
SHDNB = V
IL
, RX_ON = V
IL
, TX_ON = V
IL
SHDNB = V
IH
, RX_ON = V
IL
,
TX_ON = V
IL
SHDNB = V
IH
, RX_ON = V
IH
,
TX_ON = V
IL
SHDNB = V
IH
,
RX_ON = V
IL
,
TX_ON = V
IH
,
bias registers
set as in Table 9
P
OUT
= +3dBm
P
OUT
=
+12dBm
P
OUT
= +17dBm
T
A
= +25°C
T
A
= -40°C to +85°C
220
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
98
157
175
185
mA
80
CONDITIONS
MIN
2.7
2
25
TYP
MAX
3.0
50
35
40
100
110
UNITS
V
µA
mA
mA
Transmit-Mode Supply Current
LOGIC INPUTS: SHDNB, RX_ON, TX_ON, SCLK, DIN, CSB, RF_GAIN
Digital Input Voltage High (V
IH
)
Digital Input Voltage Low (V
IL
)
Digital Input Current High (I
IH
)
Digital Input Current Low (I
IL
)
LOGIC OUTPUT: DOUT
Digital Output Voltage High (V
OH
)
Digital Output Voltage Low (V
OL
)
ANALOG OUTPUT: PWR_DET
Power-Detector Output
Impedance
400
Ω
Sourcing 100µA
Sinking 100µA
V
CC
-
0.5
0.5
V
V
-5
-5
V
CC
-
0.5
0.5
+5
+5
V
V
µA
µA
2
_______________________________________________________________________________________
2.4GHz 802.11b Zero-IF Transceiver
with Integrated PA and Tx/Rx Switch
DC ELECTRICAL CHARACTERISTICS (continued)
(MAX2822 EV kit: V
CC
= +2.7V to +3.0V, RF_GAIN = V
IH
, 0V
≤
V
TX_GC
≤
+2.0V, 0V
≤
V
RX_AGC
≤
+2.0V, R
BIAS
= 12kΩ, no input sig-
nals at RF and baseband inputs, RF I/O terminated into 50Ω though a 2:1 balun, receiver baseband outputs are open, transmitter
baseband inputs biased at +1.2V, registers set to default power-up settings, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are for V
CC
= +2.7V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETERS
RX BASEBAND I/O
RX_AGC Input Resistance
Rx I/Q Common-Mode Voltage
Rx I/Q Output DC Offsets
TX BASEBAND I/O
TX BB Input Common-Mode
Range
TX BBI and BBQ Input Bias
Current
TX BB Input Impedance
TX_GC Input Bias Current
TX_GC Input Impedance
Reference Oscillator Input
Impedance
VOLTAGE REFERENCE
Reference Voltage
I
LOAD
= ±2mA
1.10
1.20
1.30
V
Differential resistance
0V
≤
V
TX_GC
≤
+2.0V
Resistance
1.0
1.2
-10
100
10
250
1.4
V
µA
kΩ
µA
kΩ
3σ limit
0V
≤
V
RX_AGC
≤
+2.0V
50
1.25
±15
kΩ
V
mV
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2822
REFERENCE OSCILLATOR INPUT
20
kΩ
AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE
(MAX2822 EV kit: V
CC
= +2.7V to +3.0V, f
RF
and f
LO
= 2400MHz to 2499MHz, f
OSC
= 22MHz or 44MHz, receive baseband output
levels = 500mV
P-P
, V
SHDNB
= V
RX_ON
= V
IH, VTX_ON
= V
IL, VCSB
= V
IH, VSCLK
= V
DIN
= V
IL
, V
RF_GAIN
= V
IH
, 0V
≤
V
RX_AGC
≤
+2.0V,
R
BIAS
= 12kΩ, I
CP
= +2mA, BW
PLL
= 45kHz, registers set to default power-up settings, T
A
= +25°C, unless otherwise noted. Typical
values are for V
CC
= +2.7V, f
LO
= 2437MHz, f
OSC
= 22MHz, unless otherwise noted.) (Note 2)
PARAMETER
RF Frequency Range
LO Frequency Range
RF_GAIN = V
IH
,
V
RX_AGC
= 0V
Voltage Gain (Note 3)
T
A
= +25°C
T
A
= -40°C to +85°C
CONDITIONS
MIN
2400
2400
97
95
35
75
3
32
dB
dB
105
TYP
MAX
2499
2499
UNITS
MHz
MHz
RECEIVER CASCADED PERFORMANCE (RF INPUT TO BASEBAND OUTPUT)
RF_GAIN = V
IH
, V
RX_AGC
= +2.0V
RF_GAIN = V
IL
, V
RX_AGC
= 0V
RF_GAIN = V
IL
, V
RX_AGC
= +2.0V
RF Gain Step
From RF_GAIN = V
IH
to RF_GAIN = V
IL
_______________________________________________________________________________________
3
2.4GHz 802.11b Zero-IF Transceiver
with Integrated PA and Tx/Rx Switch
MAX2822
AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE (continued)
(MAX2822 EV kit: V
CC
= +2.7V to +3.0V, f
RF
and f
LO
= 2400MHz to 2499MHz, f
OSC
= 22MHz or 44MHz, receive baseband output
levels = 500mV
P-P
, V
SHDNB
= V
RX_ON
= V
IH, VTX_ON
= V
IL, VCSB
= V
IH, VSCLK
= V
DIN
= V
IL
, V
RF_GAIN
= V
IH
, 0V
≤
V
RX_AGC
≤
+2.0V,
R
BIAS
= 12kΩ, I
CP
= +2mA, BW
PLL
= 45kHz, registers set to default power-up settings, T
A
= +25°C, unless otherwise noted. Typical
values are for V
CC
= +2.7V, f
LO
= 2437MHz, f
OSC
= 22MHz, unless otherwise noted.) (Note 2)
PARAMETER
DSB Noise Figure (Note 4)
Adjacent Channel Rejection
Input Third-Order Intercept Point (Note 6)
Input Second-Order Intercept Point (Note 7)
LO Leakage
Input Return Loss
RECEIVER BASEBAND
BASEBAND FILTER RESPONSE
-3dB Frequency
Default bandwidth setting BW(2:0) = (010)
At 12.5MHz
Attenuation Relative to Passband
At 16MHz
At 20MHz
At 25MHz
BASEBAND OUTPUT CHARACTERISTICS
Rx I/Q Gain Imbalance
Rx I/Q Phase Quadrature Imbalance
Rx I/Q Output 1dB Compression
Rx I/Q Output THD
BASEBAND AGC AMPLIFIER
AGC Range
AGC Slope
AGC Response Time
V
RX_AGC
= 0 to +2.0V
Peak gain slope
20dB gain step (80dB to 60dB),
settling to
±1dB
70
60
2
dB
dB/V
µs
3σ limit
3σ limit
Differential voltage into 5kΩ
V
OUT
= 500mV
P-P
at 5.5MHz, Z
L
= 5kΩ||5pF
±1
±5
1
-35
dB
Degrees
VP-P
dBc
7
40
65
70
85
dB
MHz
CONDITIONS
RF_GAIN = V
IH
, RX gain
≥
80dB
RF_GAIN = V
IH
, RX gain = 50dB
RF_GAIN = V
IL
, RX gain = 50dB
RX gain = 70dB (Note 5)
RF_GAIN = V
IH
, RX gain = 80dB
RF_GAIN = V
IL
, RX gain = 50dB
RF_GAIN = V
IH
, RX gain = 80dB
RF_GAIN = V
IL
, RX gain = 50dB
At balun input
MIN
TYP
5.5
8
35
45
-13
+19
+23
+60
-65
15
dB
dBm
dBm
dBm
dB
MAX
6.0
dB
UNITS
4
_______________________________________________________________________________________
2.4GHz 802.11b Zero-IF Transceiver
with Integrated PA and Tx/Rx Switch
AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE
(MAX2822 EV kit, characteristics relative to RFP/RFN: V
CC
= +2.7V to +3.0V, f
RF
and f
LO
= 2400MHz to 2499MHz, f
OSC
= 22MHz or
44MHz, transmit baseband input signal: 500mV
P-P
at 5.5MHz, V
SHDNB
= V
RX_ON
= V
IL, VTX_ON
= V
IH, VCSB
= V
IH
, V
SCLK
= V
DIN
=
V
IL
, V
RF_GAIN
= V
IH
, 0V
≤
V
TX_AGC
≤
+2.0V, R
BIAS
= 12kΩ, ICP = +2mA, BW
PLL
= 45kHz, baseband inputs DC biased to +1.2V, reg-
isters set to default power-up settings, measurements taken within 1s of TXON rising edge, T
A
= +25°C, unless otherwise noted.
Typical values are for V
CC
= +2.7V, f
LO
= 2437MHz, f
OSC
= 22MHz, unless otherwise noted.) (Note 2)
PARAMETER
RF Output Frequency Range
LO Output Frequency Range
11Mbps CCK signal,
ACPR (adj)
≤
-30dBc,
ACPR (alt)
≤
-50dBc
(Note 4)
T
A
= +25°C
T
A
= -40°C to +85°C
CONDITIONS
MIN
2400
2400
+16.5
+15.5
+17.5
dBm
TYP
MAX
2499
2499
UNITS
MHz
MHz
MAX2822
TRANSMIT SIGNAL PATH: BASEBAND INPUT TO RF OUTPUT
Tx RF Output Power
Adjacent (adj):
-22MHz
≤
f
OFFSET
≤
-11MHz,
11MHz
≤
f
OFFSET
≤
22MHz,
P
OUT
= +16.5dBm
Tx RF ACPR (Note 8)
Alternate (alt):
-33MHz
≤
f
OFFSET
< -22MHz,
22MHz < f
OFFSET
≤
33MHz,
P
OUT
= +16.5dBm
In-Band Spurious Signals Relative to Carrier
f
RF
= 2400MHz to
2483MHz
(Note 9)
11Mbps CCK at
+16.5dBm
< 2400MHz
2500MHz to 3350MHz
> 3350MHz
f
OFFSET
≥
22MHz, 0V
≤
V
TX_GC
≤
+2.0V
100Ω balanced output impedance,
P
OUT
= +17dBm
Unwanted sideband
LO signal
Spurs >
±22MHz
2
×
f
RF
3
×
f
RF
-33
dBc
-56
-40
-30
-80
-45
-30
-50
-35
-40
-125
10
dBm/Hz
dB
dBm
dBm
dBc
Tx RF Harmonics
Tx RF Spurious Signal Emissions
(Outside 2400MHz to 2483.5MHz)
Nonharmonic Signals
Tx RF Output Noise
Tx RF Output Return Loss
Tx BASEBAND FILTER RESPONSE
-3dB Frequency
Attenuation Relative to Passband
Tx GAIN-CONTROL CHARACTERISTICS
Gain-Control Range
Gain-Control Slope
Gain-Control Response Time
10
At 22MHz
At 44MHz
0V
≤
V
TX_GC
≤
+2.0V
Peak gain slope
V
TX_GC
= +2.0V to 0V step, settled to within
±1dB
25
50
20
30
0.3
MHz
dB
dB
dB/V
µs
_______________________________________________________________________________________
5
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