MAX2450CEP Maxim Integrated Products, MAX2450CEP Datasheet

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MAX2450CEP

Manufacturer Part Number
MAX2450CEP
Description
3V, ultra-low-power quadrature modulator/demodulator.
Manufacturer
Maxim Integrated Products
Datasheet

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The MAX2450 combines a quadrature modulator and
quadrature demodulator with a supporting oscillator and
divide-by-8 prescaler on a monolithic IC. It operates
from a single +3V supply and draws only 5.9mA. The
demodulator accepts an amplified and filtered IF signal
in the 35MHz to 80MHz range, and demodulates it into I
and Q baseband signals with 51dB of voltage conver-
sion gain. The IF input is terminated with a 400
film resistor for matching to an external IF filter. The
baseband outputs are fully differential and have 1.2Vp-p
signal swings. The modulator accepts differential I and
Q baseband signals with amplitudes up to 1.35Vp-p
and bandwidths to 15MHz, and produces a differential
IF signal in the 35MHz to 80MHz range.
Pulling the CMOS-compatible ENABLE pin low shuts
down the MAX2450 and reduces the supply current to
less than 1µA. To minimize spurious feedback, the
MAX2450’s internal oscillator is set at twice the IF via
external tuning components. The oscillator and associ-
ated phase shifters produce differential signals exhibit-
ing low amplitude and phase imbalance, yielding
modulator sideband rejection of 38dB. The MAX2450
comes in a QSOP package.
19-0455; Rev 1; 9/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
TOP VIEW
Digital Cordless Phones
GSM and North American Cellular Phones
Wireless LANs
Digital Communications
Two-Way Pagers
PRE_OUT
LO_V
ENABLE
IF_OUT
IF_OUT
Q_IN
Q_IN
GND
I_IN
I_IN
CC
________________________________________________________________ Maxim Integrated Products
10
1
2
3
4
5
6
7
8
9
General Description
MAX2450
QSOP
Pin Configuration
Applications
20
19
18
17
16
15
14
13
12
11
3V, Ultra-Low-Power Quadrature
IF_IN
GND
V
I_OUT
I_OUT
Q_OUT
Q_OUT
LO_GND
TANK
TANK
CC
thin-
Modulator/Demodulator
____________________________Features
MAX2450CEP
LO_GND
LO_V
Combines Quadrature Modulator and
Demodulator
Integrated Quadrature Phase Shifters
On-Chip Oscillator (Requires External Tuning
Circuit)
On-Chip Divide-by-8 Prescaler
Modulator Input Bandwidth Up to 15MHz
Demodulator Output Bandwidth Up to 9MHz
51dB Demodulator Voltage Conversion Gain
CMOS-Compatible Enable
5.9mA Operating Supply Current
1µA Shutdown Supply Current
TANK
TANK
IF_IN
Q_IN
Q_IN
I_IN
I_IN
V
CC
CC
PART
20
10
11
12
13
18
4
5
6
7
OSCILLATOR
400
LOCAL
TEMP. RANGE
0°C to +70°C
QUADRATURE
GENERATOR
DEMODULATOR
Ordering Information
PHASE
÷
÷
Functional Diagram
2
2
MODULATOR
BANDGAP
90°
GND
3, 19
MASTER BIAS
PRESCALER
MAX2450
20 QSOP
PIN-PACKAGE
ENABLE
BIAS
BIAS
8
÷
4
17
16
15
14
9
1
2
I _OUT
I_OUT
Q_OUT
Q_OUT
PRE_OUT
IF_OUT
IF_OUT
1

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MAX2450CEP Summary of contents

Page 1

... On-Chip Oscillator (Requires External Tuning Circuit) On-Chip Divide-by-8 Prescaler thin- Modulator Input Bandwidth Up to 15MHz Demodulator Output Bandwidth Up to 9MHz 51dB Demodulator Voltage Conversion Gain CMOS-Compatible Enable 5.9mA Operating Supply Current 1µA Shutdown Supply Current PART MAX2450CEP Applications 20 IF_IN IF_IN 20 10 LO_V GND 19 CC ...

Page 2

Ultra-Low-Power Quadrature Modulator/Demodulator ABSOLUTE MAXIMUM RATINGS V , LO_V to GND............................................-0.3V to +4. ENABLE, TANK, TANK, I_IN, I_IN, Q_IN, Q_IN to GND ..................................................-0. IF_IN to GND .........................................................-0.3V to +1.5V Stresses beyond those listed under “Absolute ...

Page 3

AC ELECTRICAL CHARACTERISTICS (continued) (MAX2450 EV kit LO_V = ENABLE = 3.0V 70.1MHz 2.82mV p IF_IN IF_IN PARAMETER MODULATOR Allowable Differential Input Voltage Input Common-Mode Voltage Range I and ...

Page 4

Ultra-Low-Power Quadrature Modulator/Demodulator ____________________________T ypical Operating Characteristics (continued) (MAX2450 EV kit LO_V = ENABLE = 3.0V 70.1MHz 2.82mV p IF_IN IF_IN A MODULATOR IF OUTPUT vs. SUPPLY VOLTAGE ...

Page 5

Operating Characteristics (continued) (MAX2450 EV kit LO_V = ENABLE = 3.0V 70.1MHz 2.82mV p IF_IN IF_IN DEMODULATOR VOLTAGE CONVERSION GAIN vs. TEMPERATURE AND SUPPLY 51 ...

Page 6

Ultra-Low-Power Quadrature Modulator/Demodulator ______________________________________________________________Pin Description PIN NAME 1 IF_OUT Modulator IF Output 2 IF_OUT Modulator IF Inverting Output 3, 19 GND Ground 4 I_IN Baseband Inphase Input 5 I_IN Baseband Inphase Inverting Input 6 Q_IN Baseband Quadrature Input 7 ...

Page 7

LO_V TANK TANK Q1 Q2 Figure 2. Local-Oscillator Equivalent Circuit _______________Detailed Description The following sections describe each of the functional blocks shown in the Functional Diagram . They also refer to the ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products To alter the oscillation frequency range, change the inductance, the capacitance, or both ...

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