Typical operating characteristics, Ac electrical characteristics (continued) – Rainbow Electronics MAX2685 User Manual
Page 3
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
_______________________________________________________________________________________
3
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2685 EV kit, V
CC
= V
SHDN
= +3V, f
LNAIN
= f
MIXIN
= 880MHz, f
LO
= 960MHz, P
LNAIN
= -30dBm, P
LO
= -8dBm, P
MIXIN
= -25dBm,
differential IFOUT operation, Z
o
= 50
Ω, T
A
= +25°C, unless otherwise noted.)
Note 1: Performance at temperatures greater than or equal to +25°C are guaranteed by production test; performance at tempera-
tures less than +25°C are guaranteed by design and characterization.
Note 2: This is the recommended operating frequency range.
Note 3: Maximum and minimum limits are guaranteed by design and device characterization and are not production tested.
Note 4: Two tones at 880MHz and 880.1MHz, -30dBm per tone.
Note 5: Two tones at 880MHz and 880.1MHz, -10dBm per tone.
Note 6: Two tones at 880MHz and 880.1MHz, -25dBm per tone.
Note 7: Time from SHDN = high, until the cascaded receive gain is within 1dB of its final value. Measured with 47pF blocking
capacitors on LNAIN and LNAOUT. Matching network removed from IFOUT output.
Typical Operating Characteristics
(MAX2685 EV kit, V
CC
= V
SHDN
= +3V, f
LNAIN
= f
MIXIN
= 880MHz, f
LO
= 960MHz, P
LNAIN
= -30dBm, P
LO
= -8dBm, P
MIXIN
= -25dBm,
differential IFOUT operation, Z
o
= 50
Ω, T
A
= +25°C, unless otherwise noted.)
0
3
2
1
4
5
6
7
8
9
10
2.5
3.5
3.0
4.0
4.5
5.0
5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2685 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
GAIN = HIGH
GAIN = LOW
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0
3
2
1
4
5
6
7
8
9
10
2.5
3.5
3.0
4.0
4.5
5.0
5.5
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2685 toc02
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (nA)
SHDN = GND
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
-15
-5
-10
5
0
15
10
20
2.5
3.5
4.0
3.0
4.5
5.0
5.5
LNA GAIN vs. SUPPLY VOLTAGE
MAX2685 toc03
SUPPLY VOLTAGE (V)
GAIN (dB)
GAIN = HIGH
GAIN = LOW T
A
= +85°C
T
A
= +25°C T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
GAIN = GND
dB
12.1
Mixer Noise Figure (SSB)
GAIN = V
CC
, T
A
= T
MIN
to T
MAX
(Note 3)
GAIN = V
CC
dB
1
2
Mixer Conversion Gain Variation over
Temperature
(Note 7)
dB
GAIN = V
CC
GAIN = GND
CONDITIONS
µs
0.8
Receiver Enable Time
13
7
dBm
-1.5
Mixer Input IP3 (Note 6)
11
LO Port Return Loss
UNITS
MIN
TYP
MAX
PARAMETER
dB
SHDN = V
CC
or GND
53
LO-to-LNAIN Isolation
dB
dB
28
LNAOUT-to-MIXIN Isolation
31
LO-to-MIXIN Isolation
OVERALL SYSTEM