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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX2451 Datasheet

3V / Ultra-Low-Power Quadrature Demodulator

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MAX2451 pdf
19-0493; Rev 0; 12/95
EVAALVUAAILTAIOBNLEKIT
3V, Ultra-Low-Power
Quadrature Demodulator
_______________General Description
The monolithic MAX2451 is a quadrature demodulator
with a supporting oscillator and divide-by-8 prescaler. It
operates from a single +3V supply and draws only
5.5mA. The demodulator accepts an amplified and fil-
tered IF signal in the 35MHz to 80MHz range, and
demodulates it into I and Q baseband signals with
51dB of voltage conversion gain. The IF input is termi-
nated with a 400thin-film resistor for matching to an
external IF filter. The baseband outputs are fully differ-
ential and have 1.2Vp-p signal swings.
Pulling the CMOS-compatible ENABLE pin low shuts
down the MAX2451 and reduces the supply current to
less than 2µA, typical. To minimize spurious feedback,
the MAX2451’s internal oscillator is set at twice the IF
frequency via external tuning components. The
MAX2451 comes in a 16-pin narrow SO package.
____________________________Features
o Integrated Quadrature Phase Shifters
o On-Chip Oscillator (Requires External Tuning
Circuit)
o 51dB Voltage Conversion Gain
o On-Chip Divide-by-8 Prescaler
o Baseband Output Bandwidth Up to 9MHz
o CMOS-Compatible Enable
o 5.5mA Operating Supply Current
2µA Shutdown Supply Current
________________________Applications
Digital Cordless Phones
GSM and North American Cellular Phones
Wireless LANs
Digital Communications
Pagers
______________Ordering Information
PART
MAX2451CSE
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
16 Narrow SO
________________Functional Diagram
__________________Pin Configuration
TOP VIEW
IF 1
GND 2
GND 3
N.C. 4
ENABLE 5
PRE_OUT 6
LO_VCC 7
TANK 8
MAX2451
SO
16 GND
15 VCC
14 I
13 I
12 Q
11 Q
10 LO_GND
9 TANK
DEMODULATOR
IF 1
400
14
I
13
I
BIAS
12
Q
11
Q
LO_VCC 7
TANK 8
TANK 9
LO_GND 10
VCC 15
÷ 2
QUADRATURE
PHASE
GENERATOR
LOCAL
OSCILLATOR
÷ 2 90°
÷4
PRESCALER
6
PRE_OUT
MAX2451
MASTER BIAS
BANDGAP
BIAS
2, 3, 16
GND
5
ENABLE
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800, or visit our WWW site at http://www.maxim-ic.com
for free samples or the latest literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX2451 Datasheet

3V / Ultra-Low-Power Quadrature Demodulator

No Preview Available !

MAX2451 pdf
3V, Ultra-Low-Power
Quadrature Demodulator
ABSOLUTE MAXIMUM RATINGS
VCC, LO_VCC to GND............................................-0.3V to +4.5V
ENABLE, TANK, TANK, I, I,
Q, Q to GND.............................................-0.3V to (VCC + 0.3V)
IF to GND...............................................................-0.3V to +1.5V
Continuous Power Dissipation (TA = +70°C)
Narrow SO (derate 8.70mW/°C above +70°C) .............696mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+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
(VCC = LO_VCC = TANK = +2.7V to +3.3V, ENABLE = VCC - 0.4V, GND = LO_GND = 0V, I = I = Q = Q = IF = TANK = OPEN,
TA = 0°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
VCC,
LO_VCC
2.7 3.3 V
Supply Current
Shutdown Supply Current
Enable/Disable Time
ENABLE Bias Current
ENABLE High Voltage
ENABLE Low Voltage
IF Input Impedance
ICC(ON)
ICC(OFF)
tON/OFF
IEN
VENH
VENL
ZIN
Enable = 0.4V
5.5 7.4 mA
2 20 µA
10 µs
1 3 µA
VCC - 0.4
V
0.4 V
320 400 480
I, I, Q, Q Voltage Level
VI/I,
VQ/Q
1.2 V
Baseband I and Q DC Offset
±11 ±50 mV
AC ELECTRICAL CHARACTERISTICS
VCC = LO_VCC = ENABLE = 3.0V, fLO = 140MHz, fIF = 70.1MHz, VIF = 2.82mVp-p, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Baseband I and Q Amplitude
Balance
Baseband I and Q Phase Accuracy
Voltage Conversion Gain
Noise Figure
Allowable I and Q Voltage Swing
I and Q IM3 Level
I and Q IM5 Level
I and Q Signal 3dB Bandwidth
Oscillator Frequency Range
PRE_OUT Output Voltage
PRE_OUT Slew Rate
Oscillator Phase Noise
NF
IM3I/Q
IM5I/Q
BW3dB
fLO
VPRE_OUT
SRPRE_OUT
(Note 1)
(Note 2)
(Note 2)
(Notes 1, 3)
RL = 10k, CL < 6pF
RL = 10k, CL < 6pF, rising edge
Offset = 10kHz
< ±0.45
dB
< ±1.3
degrees
51 dB
18 dB
1.35 Vp-p
-44 dBc
-60 dBc
9 MHz
70 160 MHz
0.35
Vp-p
60 V/µs
-80 dBc/Hz
Note 1: Guaranteed by design, not tested.
Note 2: fIF = 2 tones at 70.10MHz and 70.11MHz, VIF = 1.41mVp-p per tone.
Note 3: Oscillator frequencies up to 1GHz (500MHz IF) by externally overdriving (see Applications Information).
2 _______________________________________________________________________________________


Part Number MAX2451
Description 3V / Ultra-Low-Power Quadrature Demodulator
Manufacturer Maxim
Total Page 6 Pages
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