MAX2426 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX2426 Datasheet PDF : 14 Pages
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900MHz Image-Reject Receiver
with Transmit Mixer
______________________________Typical Operating Characteristics (continued)
(MAX2424/MAX2426 EV kit, VCC = +3.3V; fLO(RX) = 925.7MHz (MAX2424), 985MHz (MAX2426); fRXIN = 915MHz, PRXIN =
-35dBm, fLO(TX) = 915MHz, VTXIN = VTXIN = 2.3V (DC bias), VTXIN = 250mVp-p, fTXIN = 1MHz, VLNAGAIN = 2V, VVCOON = 2.4V,
RXON = TXON = MOD = DIV1 = PREGND = GND, TA = +25°C, unless otherwise noted.)
POWER vs. TXIN VOLTAGE
10
0
TXON = VCC
NOTE: TXIN IS TOTAL
-10 VOLTAGE FOR TWO TONES
-20 (PEAK-TO-PEAK)
-30
-40
FUNDAMENTAL
-50
-60
IM3 LEVEL
-70
-80
-90
-100
10
100
1000
TXIN VOLTAGE (mVp-p)
TRANSMITTER BASEBAND
FREQUENCY RESPONSE
3
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33 TXON = VCC
-36
1
10
100
1000
FREQUENCY (MHz)
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
VCC
Supply-Voltage Input for Master Bias Cell. Bypass with a 47pF low-inductance capacitor and 0.1µF to
GND (pin 28 recommended).
2
CAP1
Receive Bias Compensation Pin. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND.
Do not make any other connections to this pin.
3
RXOUT Single-ended, 330Ω IF Output. AC couple to this pin.
4
GND
Ground Connection
5
RXIN
Receiver RF Input, single ended. The input match shown in Figure 1 maintains an input VSWR of better
than 2:1 from 902MHz to 928MHz.
6
VCC
Supply Voltage Input for the Receive Low-Noise Amplifier. Bypass with a 47pF low-inductance capacitor
to GND (pin 7 recommended).
7
GND
Ground Connection for Receive Low-Noise Amplifier. Connect directly to ground plane using multiple
vias.
8
GND
Ground Connection for Signal-Path Blocks, except LNA
9
TXOUT
PA Predriver Output. See Figure 1 for an example matching network, which provides better than 2:1
VSWR from 902MHz to 928MHz.
Low-Noise Amplifier Gain-Control Input. Drive this pin high for maximum gain. When LNAGAIN is pulled
10
LNAGAIN
low, the LNA is capacitively bypassed and the supply current is reduced by 4.5mA. This pin can also be
driven with an analog voltage to adjust the LNA gain in intermediate states. Refer to the Receiver Gain
vs. LNAGAIN Voltage graph in the Typical Operating Characteristics, as well as Table 1.
11
VCC
Supply Voltage Input for the Signal-Path Blocks, except LNA. Bypass with a 47pF low-inductance capac-
itor and 0.01µF to GND (pin 8 recommended).
_______________________________________________________________________________________ 7
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