max2451cse Maxim Integrated Products, Inc., max2451cse Datasheet

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max2451cse

Manufacturer Part Number
max2451cse
Description
3v, Ultra-low-power Quadrature Demodulator
Manufacturer
Maxim Integrated Products, Inc.
Datasheet

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Part Number:
MAX2451CSE
Manufacturer:
MAXIM/美信
Quantity:
20 000
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 400
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.
________________________Applications
19-0493; Rev 0; 12/95
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.
__________________Pin Configuration
_______________General Description
TOP VIEW
Digital Cordless Phones
GSM and North American Cellular Phones
Wireless LANs
Digital Communications
Pagers
PRE_OUT
ENABLE
LO_V
TANK
GND
GND
N.C.
CC
IF
________________________________________________________________ Maxim Integrated Products
thin-film resistor for matching to an
1
2
3
4
5
6
7
8
MAX2451
SO
16
15
14
13
12
11
10
9
GND
V
I
I
Q
Q
LO_GND
TANK
CC
Quadrature Demodulator
____________________________Features
________________Functional Diagram
LO_GND
LO_V
______________Ordering Information
MAX2451CSE
Integrated Quadrature Phase Shifters
On-Chip Oscillator (Requires External Tuning
Circuit)
51dB Voltage Conversion Gain
On-Chip Divide-by-8 Prescaler
Baseband Output Bandwidth Up to 9MHz
CMOS-Compatible Enable
5.5mA Operating Supply Current
2µA Shutdown Supply Current
TANK
TANK
V
CC
CC
IF
PART
10
15
3V, Ultra-Low-Power
1
7
8
9
OSCILLATOR
400
BANDGAP
LOCAL
GND
2, 3, 16
TEMP. RANGE
QUADRATURE
MASTER BIAS
DEMODULATOR
GENERATOR
0°C to +70°C
PHASE
÷
÷
2
2
90°
ENABLE
BIAS
PRESCALER
5
MAX2451
16 Narrow SO
PIN-PACKAGE
BIAS
÷
4
6
14
13
12
11
I
I
Q
Q
PRE_OUT
1

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max2451cse Summary of contents

Page 1

... Integrated Quadrature Phase Shifters On-Chip Oscillator (Requires External Tuning Circuit) 51dB Voltage Conversion Gain On-Chip Divide-by-8 Prescaler Baseband Output Bandwidth Up to 9MHz CMOS-Compatible Enable 5.5mA Operating Supply Current 2µA Shutdown Supply Current ______________Ordering Information PART MAX2451CSE ________________Functional Diagram 1 IF 400 GND 7 V LO_V CC CC ...

Page 2

Ultra-Low-Power Quadrature Demodulator ABSOLUTE MAXIMUM RATINGS V , LO_V to GND............................................-0.3V to +4. ENABLE, TANK, TANK GND.............................................-0. GND...............................................................-0.3V to +1.5V Stresses beyond those listed under “Absolute Maximum Ratings” ...

Page 3

Operating Characteristics (V = LO_V = ENABLE = 3.0V 140MHz SUPPLY CURRENT vs. TEMPERATURE 6 3.0V CC 6.2 6.0 5.8 5.6 5.4 5 ...

Page 4

Ultra-Low-Power Quadrature Demodulator _____________________Pin Description PIN NAME FUNCTION Input GND Ground No Connect. No internal connec- 4 N.C. tion to this pin. 5 ENABLE Enable Control, active high Local-Oscillator Divide-by-8 6 PRE_OUT Prescaled ...

Page 5

LO_V TANK TANK Q1 Q2 Figure 2. Local-Oscillator Equivalent Circuit Quadrature Phase Generator The quadrature phase generator uses two latches to divide the local-oscillator frequency by two, and gener- ates two precise ...

Page 6

Ultra-Low-Power Quadrature Demodulator ________________________________________________________Package Information 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 ...

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