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MAX2424EAI+T

P1-P3P4-P6P7-P9P10-P12P13-P14
MAX2424/MAX2426
900MHz Image-Reject Receiver
with Transmit Mixer
_______________________________________________________________________________________ 7
-36
3
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
1 10 100 1000
TRANSMITTER BASEBAND
FREQUENCY RESPONSE
MAX2424/6-20
FREQUENCY (MHz)
TXOUT (dBc)
TXON = V
CC
-100
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10 100 1000
POWER vs. TXIN VOLTAGE
MAX2424/6-19
TXIN VOLTAGE (mVp-p)
POWER (dBm)
TXON = V
CC
NOTE: TXIN IS TOTAL
VOLTAGE FOR TWO TONES
(PEAK-TO-PEAK)
FUNDAMENTAL
IM3 LEVEL
______________________________Typical Operating Characteristics (continued)
(MAX2424/MAX2426 EV kit, V
CC
= +3.3V; f
LO(
RX)
= 925.7MHz (MAX2424), 985MHz (MAX2426); f
RXIN
= 915MHz, P
RXIN
=
-35dBm, f
LO(TX)
= 915MHz, V
TXIN
= V
TXIN
= 2.3V (DC bias), V
TXIN
= 250mVp-p, f
TXIN
= 1MHz, V
LNAGAIN
= 2V, V
VCOON
= 2.4V,
RXON = TXON = MOD = DIV1 = PREGND = GND, T
A
= +25°C, unless otherwise noted.)
______________________________________________________________Pin Description
Supply Voltage Input for the Receive Low-Noise Amplifier. Bypass with a 47pF low-inductance capacitor
to GND (pin 7 recommended).
6
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.
5
Ground Connection4
V
CC
RXIN
GND
Single-ended, 330Ω IF Output. AC couple to this pin. 3
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.
2
Supply-Voltage Input for Master Bias Cell. Bypass with a 47pF low-inductance capacitor and 0.1µF to
GND (pin 28 recommended).
1
FUNCTIONPIN
Low-Noise Amplifier Gain-Control Input. Drive this pin high for maximum gain. When LNAGAIN is pulled
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.
10
PA Predriver Output. See Figure 1 for an example matching network, which provides better than 2:1
VSWR from 902MHz to 928MHz.
9
LNAGAIN
TXOUT
Ground Connection for Receive Low-Noise Amplifier. Connect directly to ground plane using multiple
vias.
7 GND
RXOUT
CAP1
V
CC
NAME
Ground Connection for Signal-Path Blocks, except LNA8 GND
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).
11 V
CC
MAX2424/MAX2426
900MHz Image-Reject Receiver
with Transmit Mixer
8 _______________________________________________________________________________________
_________________________________________________Pin Description (continued)
FUNCTIONPIN NAME
Transmit Bias Compensation Input. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND.
Do not make any other connections to this pin.
14
Transmit Mixer’s Inverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input port.
See Figure 1.
13
CAP2
TXIN
Transmit Mixer’s Noninverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input
port. See Figure 1.
12 TXIN
Prescaler/Oscillator Buffer Output. In divide-by-64/65 mode (DIV1 = low), the output level is 500mVp-p
into a high-impedance load. In divide-by-1 mode (DIV1 = high), this output delivers -8dBm into a 50Ω
load. AC couple to this pin.
21
Ground connection for the Prescaler. Connect PREGND to ground for normal operation. Leave uncon-
nected to disable the prescaler and the output buffer. Connect MOD and DIV1 to ground and leave PRE-
OUT unconnected when disabling the prescaler.
20
PREOUT
PREGND
Modulus Control for the Divide-by-64/65 Prescaler. Drive MOD high for divide-by-64 mode. Drive MOD
low for divide-by-65 mode.
19
Drive VCOON with a logic high to turn on the VCO, phase shifters, VCO buffers, and prescaler. To dis-
able the prescaler, leave the PREGND pin unconnected.
17
Drive RXON and VCOON with a logic high to enable the LNA, receive mixer, and IF output buffer.
See Power Management section.
16
MOD
VCOON
RXON
Drive TXON and VCOON with a logic high to enable the transmit IF variable-gain amplifier, upconverter
mixer, and PA predriver. See Power Management section.
15 TXON
Drive DIV1 with a logic high to disable the divide-by-64/65 prescaler and connect the PREOUT pin
directly to an oscillator buffer amplifier, which outputs -8dBm into a 50Ω load. Drive DIV1 low for divide-
by-64/65 operation. Drive this pin low when in shutdown to minimize shutdown current.
18 DIV1
Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND
(pin 20 recommended).
22 V
CC
Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using
an external oscillator.
24
TANK
Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to GND
(pin 26 recommended).
23 V
CC
Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using
an external oscillator.
25 TANK
Ground Connection for VCO and Phase Shifters26 GND
Ground (substrate)27 GND
Ground Connection for Master Bias Cell28 GND
MAX2424/MAX2426
900MHz Image-Reject Receiver
with Transmit Mixer
_______________________________________________________________________________________ 9
V
CC
V
CC
17
16
15
18
19
21
1000pF
VARACTORS:
ALPHA SMV1299-004
OR EQUIVALENT
WHEN USING DIFFERENTIAL
SOURCE, REMOVE RESISTORS
AND REPLACE CAPACITORS WITH
SHORTS. FOR SINGLE-ENDED
SOURCE, DRIVE ONLY MODULATOR
INPUT. CHOOSE R
A
AND R
B
VALUES
AS SHOWN IN TRANSMITTER SECTION.
RECEIVE IF OUTPUT (330Ω)
27
23
26
3
20
22
1
28
RECEIVE
RF INPUT
TRANSMIT
RF OUTPUT
5
9
7
6
0.01µF
47pF
V
CC
V
CC
0.1µF
V
CC
V
CC
V
CC
2
47pF
47pF
0.1µF
8.2nH
12nH
22nH
18nH
47pF
47pF
47pF
8
11
0.01µF
47pF
0.01µF
VCO TANK COMPONENTS
FOR 915MHz RF FREQUENCY
47pF
14
0.01µF
47pF
RXIN
TXOUT
GND
V
CC
V
CC
GND
GND
CAP2
GND
CAP1
V
CC
V
CC
TXON
RXON
VCOON
DIV1
MOD
PREOUT
TXON
RXON
VCOON
DIV1
MOD
TO PLL
GND
RXOUT
100nH
GND
PREGND
47pF
24
25
VCO
ADJUST
C3
1k
47k
47pF
1k
C2
C26
R6
R7
V
CC
V
CC
R
A
R
B
10k
10k
L3
TANK
MODULATOR INPUT
12
0.01µF*
TXIN
MODULATOR INPUT
13
0.01µF*
TXIN
LNAGAIN
LNAGAIN
4
47pF
10
MAX2424
MAX2426
TANK
*
MAX2424
MAX2426
DEVICE
10
20
R6, R7
(Ω)
2.0
4.0
C26
(pF)
6.8
3.3
L3
(nH)
3.3
8.0
C2, C3
(pF)
Figure 1. Typical Operating Circuit
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX2424EAI+T

Mfr. #:
Buy MAX2424EAI+T
Manufacturer:
Maxim Integrated
Description:
RF Receiver Integrated Circuits (ICs)
Lifecycle:
New from this manufacturer.
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