19-1924; Rev 1; 10/01
Complete Dual-Band
Quadrature Transmitter
General Description
The MAX2369 is a dual-band, triple-mode complete
transmitter for cellular phones. The device takes a differ-
ential I/Q baseband input and mixes it up to IF through a
quadrature modulator and IF variable-gain amplifier
(VGA). The signal is then routed to an external bandpass
filter and upconverted to RF through an SSB mixer and
RF VGA. The signal is further amplified with an on-board
PA driver.
The MAX2369 is designed for dual-band operation and
supports TDMA for the PCS band as well as TDMA and
AMPS for the cellular band. The desired mode of
operation is selected by loading data on the SPI™/
MICROWIRE™-compatible 3-wire serial bus. The
MAX2369 then routes the signals to the appropriate ports
depending on which band is selected. The MAX2369
includes two RF LO input ports and two PA driver ports,
eliminating the need for external switching circuitry.
The MAX2369 takes advantage of the serial bus to set
modes such as charge-pump current, high or low side-
band injection, and IF/RF gain balancing. It is packaged
in a small (7mm
✕
7mm) 48-pin QFN package with
exposed paddle.
o
Dual-Band, Triple-Mode Operation
o
+7dBm Output Power with -34dBc ACPR
(NADC Modulation)
o
100dB Power Control Range
o
Supply Current Drops as Output Power Is Reduced
o
On-Chip IF VCO and IF PLL
o
QSPI/SPI/MICROWIRE-Compatible 3-Wire Bus
o
Digitally Controlled Operational Modes
o
+2.7V to +5.5V Operation
o
Single Sideband Upconverter Eliminates SAW
Filters
o
Power Control Distributed at IF and RF for
Optimum Dynamic Range
Features
MAX2369
Ordering Information
PART
MAX2369EGM
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
48 QFN-EP*
Applications
Dual-Band TDMA/Amps Handsets
GAIT Handsets
Triple-Mode, Dual-Mode, or Single-Mode
Mobile Phones
Satellite Phones
Wireless Data Links (WAN/LAN)
Wireless Local Area Networks (LANs)
High-Speed Data Modems
High-Speed Digital Cordless Phones
Wireless Local Loop (WLL)
*Exposed paddle
Functional Diagram
GND
GND
GND
GND
LOL
LOH
N.C.
V
CC
GND
V
CC
48
47
46
45
44
43
42
41
40
39
38
37
IFCP
V
CC
RFL
RFH
LOCK
V
CC
V
CC
V
CC
TXGATE
IFIN+
IFIN-
N.C.
N.C.
R
BIAS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
Σ
Σ
36
IFPLL
35
34
33
32
31
MAX2369
90
0
+45
-45
/2
30
29
28
90 /2
Pin Configuration appears at end of data sheet.
Selector Guide appears at end of data sheet.
27
26
25
REF
N.C.
N.C.
N.C.
N.C.
TANK+
TANK-
IFLO
V
CC
SHDN
I-
I+
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
CLK
DI
CS
V
CC
V
CC
IFOUT+
IFOUT-
V
GC
V
CC
V
CC
Q+
Q-
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Complete Dual-Band
Quadrature Transmitter
MAX2369
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +3.6V
RFL, RFH.............................................................................+5.5V
DI, CLK,
CS,
VGC,
SHDN, TXGATE,
LOCK.....................................................-0.3V to (V
CC
+ 0.3V)
AC Input Pins (IFIN, Q, I, TANK, REF,
LOL, LOH) ...............................................................1.0V peak
Digital Input Current (SHDN,
TXGATE,
CLK, DI,
CS)
................................................................±10mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin QFN-EP (derate 27mW/°C above +70°C) ..............2.5W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+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
(MAX2369
Test Fixture:
V
CC
= V
BATT
= +2.75V,
SHDN
=
TXGATE
= +2.0V, VGC = +2.5V, R
BIAS
= 16kΩ, T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C, and operating modes are defined in Table 6.)
PARAMETER
Operating Supply Voltage
VGC = 0.5V
PCS mode
VGC = 2.0V
VGC = 2.5V
VGC = 0.5V
(Note 1)
Operating Supply Current
FM mode
Cellular
digital mode
VGC = 2.0V
VGC = 2.5V
VGC = 0.5V
VGC = 2.0V
VGC = 2.5V
Addition for IFLO buffer
TXGATE
= 0.6V
SHDN
= 0.6V, sleep mode
Logic High
Logic Low
Logic Input Current
VGC Input Current
VGC Input Resistance During Shutdown
Lock Indicator High
Lock Indicator Low
SHDN
= 0.6V
50kΩ pullup load
50kΩ pullup load
-5
-12
200
V
CC
- 0.4
0.4
280
2.0
0.6
+5
+12
CONDITIONS
MIN
2.7
80
85
120
82
87
123
77
80
105
6.5
16
0.5
TYP
MAX
3.0
106
112
150
107
113
155
101
105
133
11
25
20
µA
V
V
µA
µA
kΩ
V
V
mA
UNITS
V
2
_______________________________________________________________________________________
Complete Dual-Band
Quadrature Transmitter
AC ELECTRICAL CHARACTERISTICS
(MAX2369
Evaluation Kit:
50Ω system, operating modes as defined in Table 6, input voltage at I and Q = 200mV
RMS
differential,
common mode = V
CC
/2, 300kHz quadrature CW tones, IF synthesizer locked with passive lead-lag second-order loop filter, REF =
200mVp-p at 19.44MHz, V
CC
=
SHDN
=
CS
=
TXGATE
= +2.75V, V
BAT
= +2.75V, IF output load = 400Ω, LOH, LOL input power =
-7dBm, f
LOL
= 1017.26MHz, f
LOH
= 2061.26MHz, IFIN = 125mV
RMS
at 181.26MHz, IS-136 TDMA modulation, f
RFH
= 1880MHz, f
RFL
= 836MHz, T
A
= +25°C, unless otherwise noted.)
PARAMETER
IF Frequency Range
I/Q Common-Mode Input
Voltage
IF Gain Control Range
IF Output Power, Digital Mode
Gain Variation Over Temperature
RX Band Noise Power
Carrier Suppression
Sideband Suppression
MODULATOR, FM MODE
IF Gain Control Range
Output Power
UPCONVERTER AND PREDRIVER
IF Frequency Range
Low-Band Frequency Range
High-Band Frequency Range
LOL Frequency Range
LOH Frequency Range
Output Power, RFL (Note 4)
VGC = 2.5V, NADC modulation, ACPR < -32dBc/
-55dBc at +30kHz/+60kHz offset
VGC = 2.5V, FM mode
VGC = 2.6V, NADC modulation, ACPR = -32dB/
-55dBc at +30kHz/+60kHz offset
VGC = 0.5V to 2.5V
Relative to +25°C, T
A
= -40°C to +85°C (Note 4)
RFL
RFH
RFL, VGC = 2.5V
RFH, VGC = 2.6V
RFL, VGC = 2.5V
RFH, VGC = 2.6V
-133
-134
-25
-24
-22
-24
5.8
9
4
RFL port
RFH port
120–235
800–1000
1700–2000
800–1150
1400–2300
7
12
6.6
30
±3
dBm
dB
dB
dBc
dBm
dBm/
Hz
MHz
MHz
MHz
MHz
MHz
dBm
VGC = 0.5V to 2.5V, IFG = 100
VGC = 2.5V, IFG = 111, I/Q modulation
VGC = 2.5V, IFG = 111, direct VCO modulation
85
-8.5
-5.5
dB
dBm
V
CC
= 2.7V to 3.0V (Notes 2, 3, 4)
VGC = 0.5V to 2.5V, IFG = 100
VGC = 2.5V, IFG = 100
Relative to +25°C, T
A
= -40°C to +85°C (Note 4)
VGC = 2.5V, IFG = 100, F
IF
= 181.26MHz, noise
measured at F
IF
± 20MHz
VGC = 2.5V, IFG = 100
VGC = 2.5V, IFG = 100
30
30
1.35
CONDITIONS
MIN
TYP
120–235
V
CC
/ 2
85
-10
±0.8
-145
49
38
V
CC
–
1.25
MAX
UNITS
MHz
V
dB
dBm
dB
dBm/Hz
dB
dB
MAX2369
MODULATOR, QUADRATURE MODES
(Digital Cellular, Digital PCS, FM IQ)
Output Power, RFH (Note 4)
Power-Control Range
Gain Variation Over Temperature
RF Image Rejection (Note 4)
LO Leakage (Note 4)
RX Band Noise Power
_______________________________________________________________________________________
3
Complete Dual-Band
Quadrature Transmitter
MAX2369
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2369
Evaluation Kit:
50Ω system, operating modes as defined in Table 6, input voltage at I and Q = 200mV
RMS
differential,
common mode = V
CC
/2, 300kHz quadrature CW tones, IF synthesizer locked with passive lead-lag second-order loop filter, REF =
200mVp-p at 19.44MHz, V
CC
=
SHDN
=
CS
=
TXGATE
= +2.75V, V
BAT
= +2.75V, IF output load = 400Ω, LOH, LOL input power =
-7dBm, f
LOL
= 1017.26MHz, f
LOH
= 2061.26MHz, IFIN = 125mV
RMS
at 181.26MHz, IS-136 TDMA modulation, f
RFH
= 1880MHz, f
RFL
= 836MHz, T
A
= +25°C, unless otherwise noted.)
PARAMETER
IF_PLL
Reference Frequency
Frequency Reference Signal
Level
IF Main Divide Ratio
IF Reference Signal Ratio
VCO Operating Range
IF LO Output Power
Charge-Pump Source/Sink
Current
BUF_EN = 1
ICP = 00
ICP = 01
ICP = 10
ICP = 11
Turbolock Boost Current
Charge-Pump Source/Sink
Matching
Charge-Pump High-Z Leakage
(Note 5)
Locked, all values of ICP, over specified compliance
range (Note 6)
Over specified compliance range (Note 6)
148
185
295
385
385
5
0.1
256
2
240–470
-6
200
260
400
530
530
5
10
260
345
515
700
700
µA
%
nA
µA
30
0.6
16384
2048
MHz
dBm
MHz
Vp-p
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
See Table 6 for register settings.
ACPR is met over the specified V
CM
range.
V
CM
must be supplied by the I/Q baseband source with ±6µA capability.
Guaranteed by design and characterization.
When enabled, turbolock is active during acquisition and injects boost current in addition to the normal charge-pump current.
Charge Pump Compliance range is 0.5V to V
CC
- 0.5V.
4
_______________________________________________________________________________________
Complete Dual-Band
Quadrature Transmitter
Typical Operating Characteristics
(MAX2369EVKIT, V
CC
= +2.8V, V
BAT
= 3.0V, T
A
= +25°C, unless otherwise noted.)
IF P
LL
SETTLING TIME
MAX2369 toc01
MAX2369
TANK 1/S11 vs. FREQUENCY
MAX2369 toc02
I
CC
vs. VGC INPUT
MAX2369 toc03
10
8
FREQUENCY DEVIATION (kHz)
6
4
2
0
-2
-4
-6
-8
-10
f
IF
= 181.26MHz
140
130
120
I
CC
(mA)
110
100
90
PCS
CELLULAR
5
4
3
2
1
z
0
= 200Ω
0 100 200 300 400 500 600 700 800 900 1000
TIME (µs)
EQUIVALENT PARALLEL R-C
1: 200MHz, 1.76kΩ, 0.26pF
2: 260MHz, 1.66kΩ, 0.31pF
3: 330MHz, 1.58kΩ, 0.34pF
4: 780MHz, 1.21kΩ, 0.43pF
5: 1GHz, 0.94kΩ, 0.47pF
80
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6
VGC (V)
OUTPUT POWER vs. VGC INPUT
MAX2369 toc04
IF OUTPUT POWER
vs. VGC INPUT AND IF DAC SETTING
MAX2369 toc05
IF OUTPUT POWER vs. VGC INPUT
-40°C
MAX2369 toc06
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
1.5
0
-20
-40
P
OUT
(dBm)
-60
-80
-100
011
-120
111
101
001
010
110
100
0
-10
-20
-30
IF POWER (dBm)
-40
-50
-60
-70
-80
-90
-100
-110
+25°C
0
0.5
1.0
1.5
OUTPUT POWER (dBm)
CELLULAR
+85°C
000
PCS
1.7
1.9
2.1
VGC (V)
2.3
2.5
0
0.5
1.0
1.5
VGC (V)
2.0
2.5
3.0
2.0
2.5
3.0
VGC (V)
IF OUTPUT POWER vs. VGC INPUT
MAX2369 toc07
SIDEBAND SUPPRESSION AND LO
FEEDTHROUGH (IFOUT)
-10
-20
-30
P
OUT
(dBm)
-40
-50
-60
-70
-80
-90
SIDEBAND
LO
DESIRED
MAX2369 toc08
0
-20
2.7V, 3.0V, 3.3V
-40
P
OUT
(dBm)
-60
-80
-100
-120
0
0.5
1.0
1.5
VGC (V)
2.0
2.5
0
3.0
-100
181.21
181.23
181.25
181.27
181.29
181.31
FREQUENCY (MHz)
_______________________________________________________________________________________
5
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