19-0425; Rev 1; 9/95
KIT ATION EVALU BLE A IL A V A
3V, Ultra-Low-Power Quadrature Modulator
________________________Applications Digital Cordless Phones GSM and North American Cellular Phones
____________________________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
______________Ordering Information PART MAX2452ISE*
TEMP. RANGE -20°C to +85°C
PIN-PACKAGE 16 Narrow SO
* An alternate marking, MAX2452CSE, has been identically tested.
Wireless LANs Digital Communications Two-Way Pagers
________________Functional Diagram
__________________Pin Configuration LO_VCC
TOP VIEW
TANK TANK LO_GND IF 1
11 8 9 10
LOCAL OSCILLATOR
PRESCALER 0°
÷4
12
PRE_OUT
QUADRATURE PHASE GENERATOR 90° ÷2
16 IF
GND 2
15 GND
I
3
I 3
14 VCC
I
4
I 4
÷2
MAX2452
13 N.C.
Q 5
12 PRE_OUT
Q 6
11 LO_VCC
ENABLE 7
10 LO_GND
TANK 8
9
SO
TANK
16 MODULATOR
Q Q VCC
5
Σ
1
IF IF
6 14
MASTER BIAS BANDGAP
BIAS
2, 15 GND
MAX2452
7 ENABLE
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX2452
_______________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.
MAX2452
3V, Ultra-Low-Power Quadrature Modulator ABSOLUTE MAXIMUM RATINGS VCC, LO_VCC to GND............................................-0.3V to +4.5V ENABLE, TANK, TANK, I, I, Q, Q to GND ..................VCC + 0.3V Continuous Power Dissipation (TA = +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
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 = 2.7V to 3.3V, TA = -20°C to +85°C, unless otherwise noted.) PARAMETER Supply Voltage Range Supply Current
SYMBOL
CONDITIONS
VCC, LO_VCC
MIN
TYP
MAX
2.7
ICC ON
Enable = VCC - 0.4V
Shutdown Supply Current
ICC OFF
Enable = 0.4V
Enable/Disable Time
tON/OFF
ENABLE Bias Current
IEN
UNITS
3.3
V
4.1
7
mA
2
20
µA
10
µA
0.4
V
10 Enable = VCC - 0.4V
µs
1
ENABLE Low Voltage
VENL
ENABLE High Voltage
VENH
VCC - 0.4
IF Voltage Level
VIF
VCC - 1.7
VCC - 1.35
V
IF Voltage Level
V IF
VCC - 1.7
VCC - 1.35
V
V
TANK Voltage Level
VTANK
LO_VCC - 1.1
LO_VCC - 0.8
V
TANK Voltage Level
V TANK
LO_VCC - 1.1
LO_VCC - 0.8
V
I, I, Q, Q Voltage Level Differential Input Impedance
V I , V I , VQ , V Q
1.25
1.5
ZII, ZQQ
35
44
1.75
V kΩ
AC ELECTRICAL CHARACTERISTICS (VCC = LO_VCC = 3.0V, fOSC = 140MHz, ENABLE = 2.6V, fII = fQQ = 600kHz, TA = -20°C to +85°C, unless otherwise noted.) PARAMETER
SYMBOL
CONDITIONS
Differential Input Voltage
VIIp-p, VQQp-p
(Note 1)
I and Q Signal Bandwidth
BWIQ
(Note 1)
IF Differential Output Voltage
VIFIFp-p
MIN
VII = VQQ = 1.2Vp-p, RL = 200kΩ differential, CL < 5pF differential
I/Q Phase Match Sideband Rejection Oscillator Frequency Range PRE_OUT Output Voltage PRE_OUT Slew Rate
VII = VQQ = 1.2Vp-p fOSC VPRE_OUT SRPRE_OUT
(Notes 1, 2) RL = 10kΩ, CL < 6pF RL = 10kΩ, CL < 6pF, rising edge, TA = +25°C
MAX
UNITS
1.2
1.35
Vp-p
15
MHz
65
I/Q Amplitude Match
LO Leakage at Output
TYP
70
mVp-p
