MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX242X/MAX246X EV kit, V
CC
= +3.3V; f
LO
= 925.7MHz (MAX2440), f
LO
= 961MHz (MAX2441), f
LO
= 985MHz (MAX2442),
f
RXIN
= 915MHz; P
RXIN
= -35dBm; V
LNAGAIN
= 2V; V
VCOON
= V
RXON
= 2.4V; RXON = MOD = DIV1 = PREGND = GND; T
A
= +25°C,
unless otherwise noted.)
Oscillator Phase Noise
Oscillator Frequency Range 690 1100 MHz
82 dBc/Hz
8
(Notes 5, 10)
10kHz offset (Note 11)
Standby to RX
Note 5: Guaranteed by design and characterization.
Note 6: Image rejection typically falls to 30dBc at the frequency extremes.
Note 7: Refer to the Typical Operating Characteristics for plots showing receiver gain versus LNAGAIN voltage, input IP3 versus
LNAGAIN voltage, and noise figure versus LNAGAIN voltage.
Note 8: Two tones at P
RXIN
= -45dBm each, f1 = 915.0MHz and f2 = 915.2MHz.
Note 9: Time delay from RXON = 0.45V to RXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 10: Refers to useable operating range. Tuning range of any given tank circuit design is typically much narrower (refer to Figure 1).
Note 11: Using tank components L3 = 5.0nH (Coilcraft A02T), C2 = C3 = C26 = 3.3pF, R6 = R7 = 10Ω.
Note 12: This approximates a typical application in which a transmitter is followed by an external PA and a T/R switch with finite
isolation.
Note 13: Relative to the rising edge of PREOUT.
Prescaler Output Level
500 mVp-p
-11 -8
Required Modulus Setup Time 10 ns
Z
L
= 100kΩ
| |
10pF
Divide-by-64/65 mode (Notes 5, 13)
Standby mode with P
RXIN
= -45dBm to
P
RXIN
= 0dBm (Note 12)
70
Oscillator Buffer Output Level
-12
dBm
Oscillator Pulling kHz
PARAMETER MIN TYP MAX UNITSCONDITIONS
T
A
= T
MIN
to T
MAX
T
A
= +25°C
DIV1 = 2.4V, Z
L
= 50Ω
(Note 5)
OSCILLATOR AND PRESCALER
