User Manual

MAX2700/MAX2701
1.8GHz to 2.5GHz Direct Downconversion
Receivers
16 ______________________________________________________________________________________
20
40
60
80
100
VGA2
BANDWIDTH vs. R
S
MAX2700/1-48
R
S
(kΩ)
VGA2 BANDWIDTH (MHz)
0.6 1.2 1.40.8 1.0 1.6 1.8 2.0
3dB BANDWIDTH
1dB BANDWIDTH
-60
-50
-55
-40
-45
-35
-30
100 500300 700 900 1100
VGA2
Q TO I CROSSTALK vs. R
L
MAX2700/1-49
R
L
(Ω)
Q TO I CROSSTALK (dB)
1.8
1.9
2.1
2.0
2.2
2.3
0.75 1.251.00 1.50 1.75 2.00
VGA2
VGA OUTPUT 1dB COMPRESSION
POINT vs. AGC VOLTAGE vs. R
L
MAX2700/1-47
AGC (V)
V
01
(PEAK-TO-PEAK V)
R
L
= 1.025kΩ
R
L
= 0.1kΩ
R
L
= 0.56kΩ
R
L
= 0.25kΩ
0
0.4
1.2
0.8
1.6
2.0
0.50 1.000.75 1.25 1.50 1.75 2.00
VGA2
I/Q VOLTAGE GAIN MISMATCH WITH
GAIN CORRECTION
MAX2700/1-46
AGC (V)
I/Q MISMATCH (dB)
2dB INPUT MISMATCH
GAIN CORRECTION ENABLED
0
100
300
200
400
500
COMBINED VGA1 AND VGA2 TURN-ON TIME
vs. DC OFFSET CAPACITANCE*
MAX2700/1-50
DC OFFSET CAPACITANCE (nF)
TURN-ON TIME (µs)
05025 75 100
3
2
1
0
-1
0.50 1.250.75 1.00 1.50 1.75 2.00
VGA2
I/Q VOLTAGE GAIN MISMATCH
vs. TEMPERATURE
MAX2700/1-45
AGC (V)
I/Q VOLTAGE GAIN (dB)
T
A
= -45°C
T
A
= +85°C
T
A
= +25°C
0dB INPUT MISMATCH
GAIN CORRECTION DISABLED
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 EV kit (Figure 3), V
CC
= +3.0V, T
A
= +25°C, SHDN = GAIN_SET = V
CC
, X2_EN = GND, CEXT+ connected to
CEXT-, P
LO
= -13dBm, F
LO
= 980MHz (MAX2700) and 1200MHz (MAX2701), P
LNAIN
= -30dBm, P
RFIN
= -25dBm, LNAIN and RFIN
(single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+,
QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to
100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V
AGC
= 1.25V, unless otherwise noted.)
MAX2700/MAX2701
*C19, C23, C30, C36 in the
EV kit schematic in Figure 3
represent DC offset capacitors.
Time from SHDN = GND to
SHDN = V
CC
, until DC quiescent
point settles within 10% of static
DC quiescent point.