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Maxim RRFP1A/T Manual de usuario Pagina 19

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Single-/Dual-Band 802.11a/b/g
World-Band Transceiver ICs
Typical Operating Characteristics (continued)
(V
CC
= 2.7V, f
RF
= 2.437GHz (802.11g) or f
RF
= 5.25GHz (802.11a), f
REFOSC
= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =
low, R
BIAS
= 11kΩ, T
A
= +25°C using the MAX2828/MAX2829 evaluation kits.)
802.11a
120
115
125
130
140
135
145
-35 -20 -15-30 -25 -10 -5 0
TX I
CC
vs. P
OUT
MAX2828/9 toc34
P
OUT
(dBm)
I
CC
(mA)
0
10
5
20
15
35
30
25
45
40
50
010142 6 18 20 24 2812 164 8 22 26 30 32
NOISE FIGURE
vs. BASEBAND GAIN SETTINGS
MAX2828/9 toc35
GAIN SETTINGS
NF (dB)
5.25GHz
5.85GHz
5.25GHz
5.85GHz
LNA = MEDIUM
LNA = LOW
LNA = HIGH
0
10
5
20
15
35
30
25
40
4.9 5.4 5.65.0 5.2 5.8 5.95.5 5.75.1 5.3
NOISE FIGURE vs. FREQUENCY
MAX2828/9 toc36
FREQUENCY (GHz)
NF (dB)
GAIN = 15dB, B7:B6 = 0X
GAIN = 45dB, B7:B6 = 10
GAIN = 50dB, B7:B6 = 11
GAIN > 65dB, B7:B6 = 11
0
20
40
100
80
60
120
010142 6 18 20 24 2812 164 8 22 26 30 32
RX VOLTAGE GAIN
vs. BASEBAND GAIN SETTING
MAX2828/9 toc37
GAIN SETTINGS
GAIN (dB)
LNA = LOW GAIN
LNA = MEDIUM GAIN
LNA = HIGH GAIN
-6
-4
-2
4
2
0
6
4.9 5.5 5.75.0 5.3 5.95.6 5.85.1 5.2 5.4
RX VOLTAGE GAIN VARIATION
vs. FREQUENCY
MAX2828/9 toc38
FREQUENCY (MHz)
GAIN VARIATION (dB)
LNA = HIGH GAIN
LNA = MEDIUM GAIN
LNA = LOW GAIN
-4
-2
-3
1
0
-1
3
2
4
25 7535 55 8545 65 95
RX IN-BAND OUTPUT P-1dB
vs. GAIN
MAX2828/9 toc39
GAIN (dB)
OUTPUT P-1dB (dBV
RMS
)
LNA MEDIUM-/HIGH-GAIN
SWITCH POINT
0
1.0
0.5
2.5
2.0
1.5
3.0
-110 -10-90 -50 10-70 -30
RX RSSI OUTPUT vs. INPUT POWER
MAX2828/9 toc40
P
IN
(dBm)
RSSI OUTPUT (V)
LNA = LOW GAIN
LNA = MEDIUM GAIN
LNA = HIGH GAIN
110
120
150
140
130
170
160
2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6
RX I
CC
vs. V
CC
MAX2828/9 toc32
V
CC
(V)
I
CC
(mA)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
100
110
140
130
120
160
150
2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6
TX I
CC
vs. V
CC
MAX2828/9 toc33
V
CC
(V)
I
CC
(mA)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
MAX2828/MAX2829
Maxim Integrated
19
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