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Part: MAX3524
Category:
Communication
-> Wireless
Description: Low-Noise, High-linearity Broadband Amplifier
Company: Maxim Integrated Products
Datasheet: Download MAX3524 datasheet File size : 472 kB
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Datasheet text preview:
19-1764; Rev 0; 7/00
Low-Noise, High-Linearity Broadband Amplifier
General Description
The MAX3524 broadband amplifier is designed specifically for cable television receiver and cable modem applications. The MAX3524 is a single-ended input, differential-output low-noise amplifier (LNA) that offers 15dB of gain. It operates from a +4.75V to +5.25V sing l e supply from 44MHz to 880MHz. The MAX3524 includes an operational amplifier that is used to control an off-chip PIN attenuator circuit at the input of the LNA. The attenuator is typically used to regulate the input signal to a value that maintains high linearity for large signals. The MAX3524 is available in a 10-pin µMAX package with an exposed paddle (EP) and opera t e s in the extended temperature range (-40°C to +85°C).
Features
o Single-Ended Input, Differential Output o +4.75V to +5.25V Single-Supply Operation o Broadband Operation: 44MHz to 880MHz o Low Noise Figure: 4.2dB o High Linearity: IIP2 (42dBm), IIP3(14dBm) o Voltage Gain: 15dB o Independent On-Chip Op Amp
MAX3524
Applications
Cable Modem Cable Set-Top Box Broadband Amplifier CATV Infrastructure
VCC = 5V 10µF 0.1µF
Ordering Information
PART MAX3524EVB TEMP. RANGE -40°C to +85°C PIN-PACKAGE 10 µMAX-EP*
*Exposed paddle
Typical Application Circuit
1
VCC
RFOUT-
10
L1 = 0.5 TO 1nH CL < 1.8pF OUTPUT TO TUNER (DIFFERENTIAL DRIVE) VCC = 5V 10µF
INPUT: 44-880MHz 75-2k
0.1µF PIN ATTENUATOR
2
RFIN
MAX3524
VCC
9
10nF
3
RFGND OPOUT OP AMP
8 RFOUT+ OPIN+ 7
0.1µF
L2 = 0.5 TO 1nH
4 R1 3k D2 CMDSH-3
0.1µF
FROM DEMOD IC TO CONTROL PIN ATTENUATOR
5
OPINGND *
BIAS
6 RBIAS = 5.9
LBIAS = 680nH
R2 3k D1 CMDSH-3
*EXPOSED PADDLE
Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Noise, High-Linearity Broadband Amplifier MAX3524
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..-0.3V to +7.0V RFIN ...+2.0V PRFIN ..0dBm RBIAS (MINIMUM) .....5 RFOUT+, RFOUT-, OPIN-, OPIN+, OPOUT...-0.3V to (VCC + 0.3V) RFOUT+, RFOUT- Short-Circuit Duration .......10s Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 10.3mW/°C above +70°C) .........825mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Junction Temperature ......+150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, VCC = +4.75V to +5.25V, RBIAS = 5.9, LBIAS = 680nH, TA = -40°C to +85°C, unless otherwise indicated. Typical values measured at VCC = +5.0V, TA = +25°C.) (Notes 1, 2)
PARAMETERS SUPPLY Supply Voltage Supply Current OPERATIONAL AMPLIFIER Common-Mode Input Range Maximum Output Voltage Minimum Output Voltage IO = 20mA IO = 20mA 0.5 VCC - 0.5 0.5 4.75 85 5.25 95 3.0 V mA V V V CONDITIONS MIN TYP MAX UNITS
AC ELECTRICAL CHARACTERISTICS
(MAX3524 EV kit as shown in Figure 1, VCC = +4.75V to +5.25V, PRFIN = -20dBm, ZS = 75, RBIAS = 5.9, LBIAS = 680nH, fIN = 44MHz, ZL = 50 || 2pF, TA = +25°C. Typical values are at VCC = +5V, unless otherwise indicated.) (Notes 2, 3)
PARAMETERS Operating Frequency Range Power Gain (Note 4) Voltage Gain (Note 5) Noise Figure (Note 3) IIP3 (Notes 3, 6) IIP2 (Notes 3, 6) Output-to-Input Isolation fRFIN = 300MHz TA = +25°C TA = -40°C to +85°C RL = 3k fRFIN = 300MHz 12 40 40 CONDITIONS MIN 44 8.0 7.6 15 4.2 14 42 60 4.9 9.8 TYP MAX 880 11 11.5 UNITS MHz dB dB dB dBm dBm dB
Note 1: Parameters are production tested at TA = +25°C and TA = +85°C. Limits are guaranteed by design and characterization for TA = -40°C to +25°C. Note 2: For optimum linearity, the DC resistance of LBIAS in series with RBIAS must be approximately 7.3. Note 3: Guaranteed by design and characterization. Note 4: Gain is guaranteed over the operating frequency range, by design and characterization. Insertion loss of balun is subtracted. Production tested at 44MHz and 880MHz. Note 5: Corresponding voltage gain at RL = 3k, calculated as in Figure 2. Note 6: Frequencies and input power levels: 275MHz, 325MHz, and -20dBm per tone.
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Low-Noise, High-Linearity Broadband Amplifier
Typical Operating Characteristics
(MAX3524 EV kit as shown in Figure 1, VCC = +5V, PRFIN = -20dBm, ZL = 50 || 2pF, RBIAS = 5.9, LBIAS = 680nH, insertion loss of balun subtracted, TA = +25°C.)
CURRENT vs. VOLTAGE
MAX3524toc01
MAX3524
POWER GAIN vs. FREQUENCY
MAX3524 toc02
POWER GAIN vs. FREQUENCY
13 12 Zs = 75 CL = 1.5pF
MAX3524 toc03
90 89 88 ICC (mA) 87 86 85 84 TA = +85°C 83 82 TA = +25°C TA = -40°C
12 11 10 GAIN (dB) 9 8 7 6
Zs = 50 CL = 1.5pF TA = -45°C TA = +25°C TA = +85°C
14
GAIN (dB)
11 10 9 8 7 6
TA = -40°C TA = +25°C TA = +85°C
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 VCC (V)
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
POWER GAIN vs. FREQUENCY
MAX3524 toc04
POWER GAIN vs. FREQUENCY
TA = +25°C Zs = 75 CL = 1.5pF
MAX3524 toc05
NOISE FIGURE vs. FREQUENCY
TA = +85°C 5 NOISE FIGURE (dB) 4 TA = +25°C 3 2 1 0 TA = -40°C
MAX3524 toc06
12 11 10 GAIN (dB) 9 8 7 6
TA = +25°C Zs = 50 CL = 1.5pF
12 11 10 GAIN (dB)
6
VCC = 4.75, 5.00, 5.25
VCC = 4.75, 5.00, 5.25
9 8 7 6
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
IIP3 vs. FREQUENCY
MAX3524 toc07
IIP2 vs. FREQUENCY
Zs = 75
MAX3524 toc08
1dB COMPRESSED OUTPUT POWER vs. FREQUENCY
MAX3524toc09
20 18 16 IIP3 (dBm)
Zs = 75 TA = -40°C
60 55
16 14 12 VCC = 5.25V
TA = +85°C TA = +25°C 45 40 35 30 TA = -40°C POUT (dBm) 50 IIP2 (dBm)
14 12 10 8
TA = +25°C
TA = +85°C
10 8 VCC = 4.75V VCC = 5.00V 6 4
50 150 250 350 450 550 650 750 850 950 FREQUENCY (MHz)
100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz)
40 140 240 340 440 540 640 740 840 940 FREQUENCY (MHz)
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