Maxim MAX2452ISE Datasheet

_______________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 out­put up to 80MHz.

Pulling the CMOS-compatible ENABLE pin low reduces
the supply current to 2µA. To minimize spurious feed­back, the MAX2452’s internal oscillator is set at twice
the IF via external tuning components. The oscillator
and associated phase shifters produce differential sig­nals 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

♦ IF Output Frequency up to 80MHz
♦ Input Bandwidth up to 15MHz
♦ On-Chip Oscillator with External Tuning Circuit
♦ On-Chip Divide-by-8 Prescaler
♦ Integrated Quadrature Phase Shifters
♦ Self-Biased Differential Baseband Inputs
♦ CMOS-Compatible Enable
♦ 4.1mA Operating Supply Current

2µA Shutdown Supply Current

MAX2452

3V, Ultra-Low-Power

Quadrature Modulator

________________________________________________________________

Maxim Integrated Products

1

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

IF
GND
V

CC


N.C.
PRE_OUT
LO_V

CC


LO_GND
TANK

IF

GND

I

I
Q
Q

ENABLE

TANK

TOP VIEW

MAX2452

SO

MAX2452

MODULATOR

LOCAL 

OSCILLATOR

÷2

÷2 ÷4

QUADRATURE

PHASE 

GENERATOR

90°

0°

Σ

LO_V

CC

TANK
TANK

LO_GND

I
I

Q
Q

V

CC

PRE_OUT

IF
IF

BANDGAP BIAS

GND ENABLE

PRESCALER

11

8
9

10

3
4

5
6

14

12

16

1

72, 15

MASTER BIAS



__________________Pin Configuration

________________Functional Diagram

Call toll free 1-800-998-8800 for free samples or literature.

PART

MAX2452ISE* -20°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 Narrow SO

EVALUATION KIT

AVAILABLE

______________Ordering Information

19-0425; Rev 1; 9/95

* An alternate marking, MAX2452CSE, has been identically tested.

MAX2452

3V, Ultra-Low-Power
Quadrature Modulator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= LO_VCC= 2.7V to 3.3V, TA= -20°C to +85°C, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(VCC= LO_VCC= 3.0V, f

OSC

= 140MHz, ENABLE = 2.6V, fII= fQQ= 600kHz, TA= -20°C to +85°C, unless otherwise noted.)

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.

Note 1: Guaranteed by design, not tested.
Note 2: The frequency range can be extended in either direction, but has not been characterized. At higher frequencies, the IF

output level may decrease and distortions may increase.

V

CC

, LO_VCCto GND............................................-0.3V to +4.5V

ENABLE, TANK, TANK

, I, I, Q, Q to GND..................VCC+ 0.3V

Continuous Power Dissipation (T

A

= +70°C)

SO (derate 8.33mW/°C above +70°C)..........................667mW

Operating Temperature Range ...........................-20°C to +85°C

Storage Temperature Range ............................–65°C to +165°C

Lead Temperature (soldering, 10sec).............................+300°C

Enable = 0.4V

Enable = VCC- 0.4V

Enable = VCC- 0.4V

CONDITIONS

kΩ35 44ZII, Z

QQ

Differential Input Impedance

V1.25 1.5 1.75VI, VI, VQ, V

Q

I, I, Q, Q Voltage Level

µA220I

CC OFF

Shutdown Supply Current

mA4.1 7I

CC ON

V2.7 3.3VCC, LO_V

CC

Supply Voltage Range
Supply Current

VLO_VCC- 1.1 LO_VCC- 0.8V

TANK

TANK Voltage Level

VLO_VCC- 1.1 LO_VCC- 0.8V

TANK

TANK Voltage Level

VVCC- 1.7 VCC- 1.35V

IF

IF Voltage Level

VVCC- 1.7 VCC- 1.35V

IF

IF Voltage Level

µs10t

ON/OFF

Enable/Disable Time

µA110I

EN

ENABLE Bias Current

V0.4V

ENL

ENABLE Low Voltage

VVCC- 0.4V

ENH

ENABLE High Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

RL= 10kΩ, CL< 6pF, rising edge,
TA= +25°C

RL= 10kΩ, CL< 6pF

(Notes 1, 2)

VII= VQQ= 1.2Vp-p

VII= VQQ= 1.2Vp-p, RL= 200kΩ
differential, CL< 5pF differential

(Note 1)

(Note 1)

CONDITIONS

V/µs60SR

PRE_OUT

PRE_OUT Slew Rate

Vp-p0.35V

PRE_OUT

PRE_OUT Output Voltage

MHz70 140 160f

OSC

Oscillator Frequency Range

dBc-36LO Leakage at Output

dB42Sideband Rejection

degrees<±3I/Q Phase Match

dB<±0.3I/Q Amplitude Match

mVp-p65V

IFIFp-p

IF Differential Output Voltage

MHz15BW

IQ

I and Q Signal Bandwidth

Vp-p1.2 1.35V

IIp-p

, V

QQp-p

Differential Input Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX2452

3V, Ultra-Low-Power

Quadrature Modulator

_______________________________________________________________________________________

3

4.8

4.7

4.6

4.5

4.4

4.3

4.2

4.1

4.0

3.9

3.8

3.7

3.6

3.5

-30 -10 10 30 50 70 90

MAX2452-01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

SUPPLY CURRENT

vs. TEMPERATURE

V

CC

= 2.7V

V

CC

= 3.3V

V

CC

= 3V

0

2

4

6

8

10

12

14

16

-30 -10 10 30 50 70 90

MAX2452-02

TEMPERATURE (°C)

V

CC

= 2.7V

V

CC

= 3.3V

V

CC

= 3V

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

SUPPLY CURRENT (µA)

-30

-34

-38

-42

-46

-50

-54

-26 -22 -18 -14 -10 -6

MAX2452-03

BASEBAND INPUT (dBV

RMS

)

OUTPUT (dBV

RMS

)

IF OUTPUT

vs. BASEBAND INPUT

Vp-p = 2 2 x 10 (V)

dBV

RMS

20



54

56

58

60

62

64

66

68

70

72

74

2.7

MAX2452-04

VCC (V)

IF OUTPUT (mVp-p)

2.8 2.9 3.0 3.1 3.2 3.3

TA = +85°C

TA = +70°C

TA = +25°C

TA = 0°C

TA = -25°C

IF OUTPUT

vs. SUPPLY VOLTAGE

-50

-48

-46

-44

-42

-40

-38

-36

-34

-32

-30

-30 -10 10 30 50 70 90

MAX2452-07

TEMPERATURE (°C)

SIDEBAND REJECTION (dBc)

V

II

= 1.2Vp-p

V

QQ

= 1.2Vp-p

SIDEBAND REJECTION

vs. TEMPERATURE

70

68

66

64

62

60

-30 -10 10 30 50 70 90

MAX2452-05

TEMPERATURE (°C)

IF OUTPUT (mVp-p)

V

CC

= 3V

IF OUTPUT

vs. TEMPERATURE

-50

-48

-46

-44

-42

-40

-38

-36

-34

-32

-30

35 40 45 50 55 60 65 70 75 80

MAX2452-06

IF FREQUENCY (MHz)

SIDEBAND REJECTION (dBc)

V

II

= 1.2Vp-p

V

QQ

= 1.2Vp-p

SIDEBAND REJECTION

vs. IF FREQUENCY

-30

-32

-34

-36

-38

-40

-42

-44
8035 40 45 50 55 60 65 70 75

MAX2452-08

IF FREQUENCY (MHz)

LO LEAKAGE (dBc)

LO LEAKAGE

vs. IF FREQUENCY

__________________________________________Typical Operating Characteristics

(VCC= LO_VCC= 3.0V, f

OSC

= 140MHz, ENABLE = 2.6V, fII= fQQ= 600kHz, RL(IF, IF) = 200kΩ differential, CL(IF, IF) < 5pF

differential, TA= +25°C, unless otherwise noted.)

100mV/

div

PRE_OUT WAVEFORM

MAX2452-09

20ns/div

RL = 10kΩ
C

L

< 6pF