MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
900MHz Image-Reject Transceivers
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX242X/246X EV kit, V
CC
= +3.3V; f
LO
= 925.7MHz (MAX2420), f
LO
= 961MHz (MAX2421), f
LO
= 985MHz (MAX2422),
f
LO
= 904.3MHz (MAX2460); f
LO
= 805MHz (MAX2463); f
RXIN
= 915MHz; P
RXIN
= -35dBm; P
TXIN
= -15dBm (330Ω); LNAGAIN = 2V;
TXGAIN = V
CC
; VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; T
A
= +25°C; unless otherwise noted.)
PARAMETER MIN TYP MAX UNITS
Transmitter Turn-On Time (Note 14)
Gain Control Range (Note 13) 36
TXGAIN Control Slope (Note 13)
dB
33 dB/V
400 ns
Oscillator Phase Noise
Output 1dB Compression
Oscillator Frequency Range
(Notes 6, 15)
2 dBm
690 1100 MHz
82 dBc/Hz
8
10kHz offset (Note 16)
Standby to TX, or standby to RX
CONDITIONS
1V ≤ TXGAIN ≤ 2V
Note 6: Guaranteed by design and characterization.
Note 7: Image rejection typically falls to 30dBc at the frequency extremes.
Note 8: Refer to the Typical Operating Characteristics for plots showing receiver gain vs. LNAGAIN voltage, input IP3 vs.
LNAGAIN voltage, and noise figure vs. LNAGAIN voltage.
Note 9: Two tones at P
RXIN
= -45dBm each, f1 = 915.0MHz and f2 = 915.2MHz.
Note 10: Time delay from RXON = 0.45V to RXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 11: Two tones at P
TXIN
= -21dBm each (330Ω), f1 = 10.6MHz, f2 = 10.8MHz (MAX2420/MAX2460), f1 = 45.9MHz,
f2 = 46.1MHz (MAX2421), f1 = 69.9MHz, f2 = 70.1MHz (MAX2422).
Note 12: Refer to the Typical Operating Characteristics for statistical data.
Note 13: Refer to the Typical Operating Characteristics for a plot showing transmitter gain vs. TXGAIN voltage.
Note 14: Time delay from TXON = 0.45V to TXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 15: Refers to useable operating range. Tuning range of any given tank circuit design is typically much narrower (refer to Figure 2).
Note 16: Using tank components L3 = 5.0nH (Coilcraft A02T), C2 = C3 = C26 = 3.3pF, R6 = R7 = 10Ω.
Note 17: This approximates a typical application in which TXOUT is followed by an external PA and a T/R switch with finite isolation.
Note 18: Relative to the rising edge of PREOUT.
Prescaler Output Level
500 mV
P-P
-11 -8
Required Modulus Setup Time
(Note 6)
10 ns
Z
L
= 100kΩ
| |
10pF
DIV1 = 2.4V, Z
L
= 50Ω, T
A
= +25°C
Divide-by-64/65 mode (Note 18)
Required Modulus Hold Time
(Note 6)
0 ns
Divide-by-64/65 mode (Note 18)
RX to TX with P
RXIN
= -45dBm (RX mode) to
P
RXIN
= 0dBm (TX mode) (Note 17)
70
Oscillator Buffer Output Level
(Note 6)
-12
dBm
DIV1 = 2.4V, Z
L
= 50Ω, T
A
= T
MIN
to T
MAX
Oscillator Pulling kHz
Output Third-Order Intercept
(Note 11)
11 dBm
Noise Figure 23
LO to TXOUT Suppression
(Note 12)
34 dBc
dB
OSCILLATOR AND PRESCALER
