Contact Linear Technology for Potential Replacement
FOR INFORMATION PURPOSES ONLY
OBSOLETE:
LT5503
1.2GHz to 2.7GHz Direct
IQ Modulator and Mixer
DescripTion
The
LT
®
5503
is a front-end transmitter IC designed for
low voltage operation. The IC contains a high frequency
quadrature modulator with a variable gain amplifier (VGA)
and a balanced mixer. The modulator includes a precision
90° phase shifter which allows direct modulation of an RF
signal by the baseband I and Q signals.
In a superheterodyne system, the mixer can be used to
generate the high frequency RF input for the modulator by
mixing the system’s 1st and 2nd local oscillators.
The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.
The VGA allows output power reduction in three steps
up to 13dB with digital control. The baseband inputs are
internally biased for maximum input voltage swing at low
supply voltage. If needed, they can be driven with external
bias voltages.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents pending.
FeaTures
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Single 1.8V to 5.25V Supply
Direct IQ Modulator with Integrated 90° Phase
Shifter*
4-Step RF Power Control
120MHz Modulation Bandwidth
Independent Double-Balanced Mixer
Modulation Accuracy Insensitive to Carrier Input
Power
Modulator I/Q Inputs Internally Biased
Available in 20-Lead FE Package
applicaTions
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IEEE 802.11 DSSS and FHSS
High Speed Wireless LAN (WLAN)
Wireless Local Loop (WLL)
PCS Wireless Data
MMDS
Typical applicaTion
2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer
2.45GHz
BPF
V
CC2
2V
V
CC1
2V
0
–5
SSB Output Power vs
I, Q Amplitude
5.25 VDC
3 VDC
1.8 VDC
BQ
+
BQ
–
V
CC
LO2 V
CC
LO1
MIXEN
MODEN
LO2
÷2
÷1
0°
90°
MX
–
MX
+
MODIN V
CC
RF
V
CC
MOD
V
CC
VGA
SSB OUTPUT POWER (dBm)
–10
–15
–20
–25
–30
–35
–40
MIXER
ENABLE
MODULATOR
ENABLE
LO2IN
(750MHz)
MODOUT
VGA
LT5503
GND
DMODE
LO1
LO1IN (2075MHz)
CONTROL
LOGIC
GC1 GC2
5503 TA01
BI
+
BI
–
2.45GHz
MODULATED
RFOUT
–45
0.1
10
0.01
1
I, Q DIFFERENTIAL INPUT VOLTAGE (V
P-P
)
5503 G04
5503fa
For more information
www.linear.com/LT5503
1
LT5503
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
BQ
–
1
BQ
+
2
GC1 3
MODIN 4
V
CC
MOD 5
V
CC
RF 6
LO1 7
V
CC
LO1 8
DMODE 9
MX
+
10
21
20 BI
–
19 BI
+
18 GC2
17 MODOUT
16 V
CC
VGA
15 V
CC
LO2
14 LO2
13 MODEN
12 MIXEN
11 MX
–
Supply Voltage ........................................................ 5.5V
Control Voltages .......................... –0.3V to (V
CC
+ 0.3V)
Baseband Voltages (BI
+
to BI
–
and BQ
+
to BQ
–
) .......±2V
Baseband Common Mode Voltage .....1V to (V
CC
– 0.3V)
LO1 Input Power ....................................................4dBm
LO2 Input Power ....................................................4dBm
MODIN Input Power ...............................................4dBm
Operating Temperature Range ................. –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 38°C/W
EXPOSED PAD IS GND (PIN 21)
MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT5503EFE#PBF
TAPE AND REEL
LT5503EFE#TRPBF
PART MARKING
5503
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 85°C
OBSOLETE PART
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
5503fa
For more information
www.linear.com/LT5503
LT5503
elecTrical characTerisTics
PARAMETER
RF Carrier Input (MODRFIN)
Frequency Range
2
Input VSWR
Input Power
Baseband Inputs (BI
+
, BI
–
, BQ
+
, BQ
–
)
Frequency Bandwidth (3dB)
Differential Input Voltage for 1dB Compressed Output
DC Common Mode Voltage
Differential Input Resistance
Input Capacitance
Gain Error
Phase Error
Modulated RF Carrier Output (MODRFOUT)
Output Power, Max Gain
Output VSWR
Image Suppression
Carrier Suppression
Output 1dB Compression
Output 3rd Order Intercept
Output 2rd Order Intercept
Broadband Noise
VGA Control Logic (GC2, GC1)
Switching Time
Input Current
Input Low Voltage
Input High Voltage
Output Power Attenuation
Output Power Attenuation
Output Power Attenuation
Modulator Enable (MODEN)
Low = Off, High = On
Turn ON/OFF Time
Input Current
Enable
Disable
Modulator Power Supply Requirements
Supply Voltage
Modulator Supply Current
Modulator Shutdown Current
MODEN = High
MODEN = Low
1.8
29
5.25
38
50
VDC
mA
µA
V
CC
– 0.4
0.4
1
105
µs
µA
VDC
VDC
GC2 = Low, GC1 = High
GC2 = High, GC1 = Low
GC2 = High, GC1 = High
1.7
4.5
9
13.5
100
2
0.4
ns
µA
VDC
VDC
dB
dB
dB
f
1
= 100kHz, f
Q
= 120kHz
f
1
= 100kHz, f
Q
= 120kHz
20MHz Offset
Z
O
= 50Ω
–26
–24
–6
–3
1.5:1
–34
–32
–3
2
16
–142
dBc
dBc
dBm
dBm
dBm
dBm/Hz
dBm
Internally Biased
120
1
1.4
18
0.8
±0.2
±1
MHz
V
P-P
VDC
kΩ
pF
dB
DEG
Requires Appropriate Matching
Z
O
= 50Ω
1.2 to 2.7
1.3:1
–20 to –10
dBm
GHz
(I/Q Modulator)
V
CC1
= 3VDC, 2.4GHz matching, MODEN = High, GC1 = GC2 = Low, T
A
= 25°C, MODRFIN = 2.45GHz at –16dBm, [I – I
B
] and [Q – Q
B
] =
100kHz CW signal at 1V
P-P
differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.) (Note 3)
CONDITIONS
MIN
TYP
MAX
UNITS
5503fa
For more information
www.linear.com/LT5503
3
LT5503
elecTrical characTerisTics
PARAMETER
Mixer 2nd LO Input (LO2IN)
Frequency Range
Input VSWR
Input Power
Mixer 1st LO Input (LO1IN)
Frequency Range
2
Input VSWR
Input 3rd Order Intercept
Mixer RF Output (MIXRFOUT)
Frequency Range
2
Output VSWR
Small-Signal Conversion Gain
Output Power
LO1 Suppression
Output 1dB Compression
Broadband Noise
Input Current
Input Low Voltage (÷2)
Input High Voltage (÷1)
Mixer Enable (MIXEN)
Low = Off, High = On
Turn ON/OFF Time
Input Current
Enable
Disable
Mixer Power Supply Requirements
Supply Voltage
Supply Current (÷2 mode)
Supply Current (÷1 mode)
Shutdown Current
DMODE = Low, MIXEN = High
DMODE = High, MIXEN = High
MIXEN = Low
1.8
11.9
10.8
10
5.25
15.5
VDC
mA
mA
µA
V
CC
– 0.4
0.4
1
130
µs
µA
VDC
VDC
V
CC
– 0.4
20MHz Offset
LO2 Divider Mode Control (DMODE)
Low = f
LO2
÷ 2, High = f
LO2
÷ 1
1
0.4
µA
VDC
VDC
Requires Appropriate Matching
Z
O
= 50Ω
P
LO1
= –30dBm
–14.7
–22
1700 to 2700
1.5:1
5
–12.7
–29
–15
–152
dB
dBm
dBc
dBm
dBm/Hz
MHz
Requires Appropriate Matching
Z
O
= 50Ω
–30dBm/Tone, ∆f = 200kHz
1400 to 2400
1.5:1
–12
dBm
MHz
Internally Matched
Z
O
= 50Ω
50 to 1000
1.4:1
–20 to –12
dBm
MHz
(Mixer)
V
CC2
= 3VDC, 2.4GHz matching, MIXEN = High, DMODE = Low (LO2 ÷ 2 mode), T
A
= 25°C, LO2IN = 750MHz at –18dBm, LO1IN =
2075MHz at –12dBm. MIXRFOUT measured at 2450MHz, unless otherwise noted. (Test circuit shown in Figure 2.) (Note 3)
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
External component values on the final test circuit shown in
Figure 2 are optimized for operation in the 2.4GHz to 2.5GHz band.
Note 3:
Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
controls.
4
5503fa
For more information
www.linear.com/LT5503
LT5503
(I/Q Modulator)
V
CC1
= 3VDC, 2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), T
A
= 25°C, MODRFIN = 2.45GHz at –16dBm, (I–I
B
) and
(Q–Q
B
) = 100kHz sine at 1V
P-P
differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.)
Modulator Supply Current vs
Supply Voltage
38
36
SUPPLY CURRENT (mA)
34
32
30
28
26
24
22
20
1.8
T
A
= –40°C
4.6
2.5
3.9
3.2
V
CC1
SUPPLY VOLTAGE (V)
5.3
5503 G01
Typical perForMance characTerisTics
Modulator Shutdown Current vs
Supply Voltage
100
MODEN = LOW
220
200
180
10
T
A
= 85°C
INPUT CURRENT (µA)
160
140
120
100
80
60
5.3
5503 G02
MODEN Current vs Enable
Voltage
MODEN = V
CC1
SHUTDOWN CURRENT (µA)
T
A
= 85°C
T
A
= 85°C
T
A
= 25°C
T
A
= 25°C
1
T
A
= 25°C
T
A
= –40°C
4.6
2.5
3.9
3.2
V
CC1
SUPPLY VOLTAGE (V)
T
A
= –40°C
0.1
1.8
40
1.8
2.5
4.6
3.9
3.2
MODEN VOLTAGE (V)
5.3
5503 G03
2.45GHz Modulated Output
Power vs Supply Voltage
–2
0
–5
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
–3
–10
–15
–20
–25
–30
–35
Baseband Frequency Response
I/Q Amplitude = 1V
P-P
0
DESIRED
SIDEBAND
–10
RETURN LOSS (dB)
MODRFIN and MODRFOUT
Return Loss 2.4GHz Matching
MODRFOUT
–4
–20
–5
–6
P
LO1
= –12dBm
P
LO2
= –18dBm
BASEBAND = 1V
P-P
T
A
= 25°C
1.8
2.4
3.0
3.6
4.2
SUPPLY VOLTAGE (V)
4.8
5.4
–30
CARRIER
IMAGE
1
I, Q INPUT FREQUENCY (MHz)
10
5503 G05
MODRFIN
–40
2050
–40
0.1
2250
2650
FREQUENCY (MHz)
2450
2850
5503 G06
5503 TA01b
Typical SSB Spectrum
0
–10
–20
–30
P
OUT
(dBm)
–40
–50
–60
–70
–80
–90
–100
2449.6 2449.8
2450.0 2450.2 2450.4
FREQUENCY (MHz)
2450.6
5503 G07
5503fa
For more information
www.linear.com/LT5503
5
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