MAX2452 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 3V, Ultra-Low-Power Quadrature Modulator

19-0425; Rev 1; 9/95
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3V, Ultra-Low-Power
Quadrature Modulator
_______________General Description
The monolithic MAX2452 is a quadrature modulator
with supporting oscillator and divide-by-8 prescaler. It
operates from a single +3V supply and draws only
4.1mA. The modulator accepts differential I and Q
baseband signals with amplitudes up to 1.35Vp-p and
bandwidths up to 15MHz. It produces a differential out-
put up to 80MHz.
Pulling the CMOS-compatible ENABLE pin low reduces
the supply current to 2µA. To minimize spurious feed-
back, the MAX2452’s internal oscillator is set at twice
the IF via external tuning components. The oscillator
and associated phase shifters produce differential sig-
nals exhibiting low amplitude and phase imbalance,
yielding 42dB sideband rejection. The MAX2452 comes
in a 16-pin narrow SO package.
________________________Applications
Digital Cordless Phones
GSM and North American Cellular Phones
Wireless LANs
Digital Communications
Two-Way Pagers
____________________________Features
o IF Output Frequency up to 80MHz
o Input Bandwidth up to 15MHz
o On-Chip Oscillator with External Tuning Circuit
o On-Chip Divide-by-8 Prescaler
o Integrated Quadrature Phase Shifters
o Self-Biased Differential Baseband Inputs
o CMOS-Compatible Enable
o 4.1mA Operating Supply Current
2µA Shutdown Supply Current
______________Ordering Information
PART
MAX2452ISE*
TEMP. RANGE
-20°C to +85°C
PIN-PACKAGE
16 Narrow SO
* An alternate marking, MAX2452CSE, has been identically tested.
________________Functional Diagram
__________________Pin Configuration
TOP VIEW
IF ₁
GND ₂
I3
I4
Q5
Q6
ENABLE ₇
TANK ₈
MAX2452
SO
16 ^IF
15 ^GND
14 ^VCC
13 ^N.C.
12 ^PRE_OUT
11 LO_VCC
10 LO_GND
9 TANK
11
LO_VCC
TANK ⁸
TANK ⁹
LO_GND ¹⁰
I3
I4
Q5
Q6
14
VCC
PRESCALER
÷2 ^0°
÷4
LOCAL
OSCILLATOR
QUADRATURE
PHASE
GENERATOR
90°
÷2
12
PRE_OUT
MODULATOR
Σ
16 _IF
1
IF
MASTER BIAS
BANDGAP
BIAS
MAX2452
2, 15
GND
7
ENABLE
________________________________________________________________ Maxim Integrated Products 1
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