FeaTures
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LTC5584
30MHz to 1.4GHz IQ
Demodulator with IIP2 and
DC Offset Control
DescripTion
The LTC
®
5584 is a direct conversion quadrature demodu-
lator optimized for high linearity receiver applications in
the 30MHz to 1.4GHz frequency range. It is also usable
in the 10MHz to 30MHz and 1.4GHz to 2GHz ranges with
reduced performance. It is suitable for communications
receivers where an RF signal is directly converted into I
and Q baseband signals with bandwidth of 530MHz or
higher. The LTC5584 incorporates balanced I and Q mix-
ers, LO buffer amplifiers and a precision, high frequency
quadrature phase shifter. In addition, the LTC5584 provides
four analog control voltage interface pins for IIP2 and DC
offset correction, greatly simplifying system calibration.
The high linearity of the LTC5584 provides excellent spur-
free dynamic range for the receiver. This direct conversion
demodulator can eliminate the need for intermediate fre-
quency (IF) signal processing, as well as the corresponding
requirements for image filtering and IF filtering. These
I/Q outputs can interface directly to channel-select filters
(LPFs) or to baseband amplifiers.
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.
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I/Q Bandwidth of 530MHz or Higher
High IIP3: 31dBm at 450MHz, 28dBm at 900MHz
High IIP2: 70dBm at 450MHz, 65dBm at 900MHz
User Adjustable IIP2 to >80dBm
User Adjustable DC Offset Null
High Input P1dB: 13.1dBm at 900MHz
Image Rejection: 45dB at 900MHz
Noise Figure: 9.9dB at 450MHz
10dB at 900MHz
Conversion Gain: 5.4dB at 450MHz
5.7dB at 900MHz
Shutdown Mode
Operating Temperature Range (T
C
): –40°C to 105°C
24-Lead 4mm
×
4mm QFN Package
applicaTions
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LTE/W-CDMA/TD-SCDMA Base Station Receivers
Wideband DPD Receivers
Point-To-Point Broadband Radios
High Linearity Direct Conversion I/Q Receivers
Image Rejection Receivers
Typical applicaTion
Direct Conversion Receiver with IIP2 and DC Offset Calibration
5V
BPF
LNA
BPF
RF
INPUT
RF
+
V
CC
I
+
I
–
RF
–
IP2 AND DC
OFFSET CAL
LO
0°
90°
LTC5584
DC OFFSET
IP2 ADJUST
D/A
Q
+
Q
–
LPF
VGA
A/D
5584 TA01a
LPF
VGA
A/D
IIP2 vs IP2I, IP2Q Trim Voltage
130
120
110
IIP2 (dBm)
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
f
RF
= 450MHz
IP2 ADJUST
DC OFFSET
D/A
D/A
100
90
80
70
60
50
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
IP2I, IP2Q (V)
5584 TA01b
LO INPUT
D/A
IP2 AND DC
OFFSET CAL
ENABLE
EN
5584f
1
LTC5584
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
24 23 22 21 20 19
IP2Q 1
DCOQ 2
DCOI 3
IP2I 4
RF
+
5
RF
–
6
7
EN
8
GND
9 10 11 12
V
BIAS
EDC
EIP2
V
CC
25
GND
18 CMQ
17 V
CAP
16 LO
–
15 LO
+
14 GND
13 GND
CMI
REF
Q
+
Q
–
I
+
I
–
V
CC
Supply Voltage ................................... –0.3V to 5.5V
V
CAP
Voltage .................................................V
CC
±0.05V
I
–
, I
+
, Q
+
, Q
–
, CMI, CMQ Voltage ........2.5V to V
CC
+ 0.3V
Voltage on Any Other Pin .................–0.3V to V
CC
+ 0.3V
LO
+
, LO
–
, RF
+
, RF
–
Input Power...........................20dBm
RF
+
, RF
–
Input DC Voltage ........................ –0.3V to 2.7V
Maximum Junction Temperature (T
JMAX
) ............. 150°C
Operating Temperature Range (T
C
)
(Note 3) .................................................. –40°C to 105°C
Storage Temperature Range .................. –65°C to 150°C
UF PACKAGE
24-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JC
= 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC5584IUF#PBF
TAPE AND REEL
LTC5584IUF#TRPBF
PART MARKING
5584
PACKAGE DESCRIPTION
24-Lead (4mm x 4mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 105°C
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/
elecTrical characTerisTics
T
C
= 25°C, V
CC
= 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ
= 0.5V, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), P
LO
= 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
MIN
TYP
30 to 1400
30 to 1400
0 to 10
95 to 190
105 to 180
5.7
9.9
15.5
33
70
80
12
1.5
0.02
0.2
MAX
UNITS
MHz
MHz
dBm
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dBm
mV
dB
Deg
5584f
SYMBOL
PARAMETER
CONDITIONS
RF Input Frequency Range
(Note 12)
f
RF(RANGE)
LO Input Frequency Range
(Note 12)
f
LO(RANGE)
LO Input Power Range
(Note 12)
P
LO(RANGE)
,
f
RF1
= 140MHz, f
RF2
= 141MHz, f
LO
= 130MHz, L6 = 68nH, C19 = 8.0pF L5 = 82nH
RF Input Frequency Range
Return Loss > 10dB
f
RF(MATCH)
LO Input Frequency Range
Return Loss > 10dB
f
LO(MATCH)
Voltage Conversion Gain
Loaded with 100Ω Pull-Up (Note 8)
G
V
NF
Noise Figure
Double-Side Band (Note 4)
Noise Figure Under Blocking Conditions
Double-Side Band, P
RF
= 0dBm (Note 7)
NF
BLOCKING
IIP3
Input 3rd Order Intercept
IIP2
Input 2nd Order Intercept
Unadjusted, EIP2 = 0V
Optimized Input 2nd Order Intercept
EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2
IIP2
OPT
P1dB
Input 1dB Compression
DC Offset at I/Q Outputs
Unadjusted, EDC = 0V (Note 13)
DC
OFFSET
I/Q Gain Mismatch
∆G
∆φ
I/Q Phase Mismatch
2
LTC5584
elecTrical characTerisTics
T
C
= 25°C, V
CC
= 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ
= 0.5V, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), P
LO
= 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
MIN
TYP
53
–85
74
300 to 600
310 to 590
5.4
9.9
13.6
31
70
80
12.6
2
0.02
0.25
52
–80
70
630 to 1200
470 to 1100
5.7
10
14.7
28
65
80
13.1
2.5
0.01
0.7
(Note 10)
45
–75
65
4.75
180
174
5.0
200
194
11
0.2
0.8
5.25
220
214
900
MAX
UNITS
dB
dBm
dB
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dBm
mV
dB
Deg
dB
dBm
dB
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dBm
mV
dB
Deg
dB
dBm
dB
V
mA
mA
μA
µs
µs
V
V
5584f
SYMBOL
PARAMETER
CONDITIONS
IRR
Image Rejection Ratio
(Note 10)
LO-RF
LO to RF Leakage
RF-LO
RF to LO Isolation
,
f
RF1
= 450MHz, f
RF2
= 451MHz, f
LO
= 440MHz, L6 = 15nH, C19 = 1.0pF L5 = 12nH, C14 = 4.0pF
RF Input Frequency Range
Return Loss > 10dB
f
RF(MATCH)
LO Input Frequency Range
Return Loss > 10dB
f
LO(MATCH)
Voltage Conversion Gain
Loaded with 100Ω Pull-Up (Note 8)
G
V
NF
Noise Figure
Double-Side Band (Note 4)
Noise Figure Under Blocking Conditions
Double-Side Band, P
RF
= 0dBm (Note 7)
NF
BLOCKING
IIP3
Input 3rd Order Intercept
IIP2
Input 2nd Order Intercept
Unadjusted, EIP2 = 0V
Optimized Input 2nd Order Intercept
EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2
IIP2
OPT
P1dB
Input 1dB Compression
DC Offset at I/Q Outputs
Unadjusted, EDC = 0V (Note 13)
DC
OFFSET
I/Q Gain Mismatch
∆G
I/Q Phase Mismatch
∆φ
IRR
Image Rejection Ratio
(Note 10)
LO-RF
LO to RF Leakage
RF-LO
RF to LO Isolation
,
,
f
RF1
= 900MHz, f
RF2
= 901MHz, f
LO
= 940MHz, C17 = 1.5pF L6 = 5.6nH, C13 = 2.2pF L5 = 3.9nH
RF Input Frequency Range
Return Loss > 10dB
f
RF(MATCH)
LO Input Frequency Range
Return Loss > 10dB
f
LO(MATCH)
Voltage Conversion Gain
Loaded with 100Ω Pull-Up (Note 8)
G
V
NF
Noise Figure
Double-Side Band (Note 4)
Noise Figure Under Blocking Conditions
Double-Side Band, P
RF
= 0dBm (Note 7)
NF
BLOCKING
IIP3
Input 3rd Order Intercept
IIP2
Input 2nd Order Intercept
Unadjusted, EIP2 = 0V
Optimized Input 2nd Order Intercept
EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2
IIP2
OPT
P1dB
Input 1dB Compression
DC Offset at I/Q Outputs
Unadjusted, EDC = 0V (Note 13)
DC
OFFSET
I/Q Gain Mismatch
∆G
I/Q Phase Mismatch
∆φ
IRR
Image Rejection Ratio
LO-RF
LO to RF Leakage
RF-LO
RF to LO Isolation
Power Supply and Other Parameters
Supply Voltage
V
CC
Supply Current
I
CC
Supply Current
I
CC(LOW)
Shutdown Current
I
CC(OFF)
Turn-On Time
t
ON
Turn-Off Time
t
OFF
EN, EDC, EIP2 Input High Voltage (On)
V
EH
EN, EDC, EIP2 Input Low Voltage (Off)
V
EL
EDC = EIP2 = V
CC
EDC = EIP2 = 0V
EN < 0.3V
EN Transition from Logic Low to High (Note 14)
EN Transition from Logic High to Low (Note 15)
2.0
0.3
3
LTC5584
elecTrical characTerisTics
SYMBOL
I
ENH
I
EDCH
I
EIP2H
V
REF
V
REF(RANGE)
Z
REF
PARAMETER
EN Pin Input Current
EDC Pin Input Current
EIP2 Pin Input Current
REF Pin Voltage
REF Pin Voltage Range
REF Input Impedance
DCOI, DCOQ, IP2I, IP2Q Pin Voltage
DCOI, DCOQ, IP2I, IP2Q Voltage Range
DCOI, DCOQ, IP2I, IP2Q Impedance
DCOI, DCOQ, IP2I, IP2Q Settling Time
DC Offset Adjustment Range
DC Offset Drift Over Temperature
I
+
, I
–
, Q
+
, Q
–
Common Mode Voltage
I
+
, I
–
, Q
+
, Q
–
Output Impedance
I
+
, I
–
, Q
+
, Q
–
Output Bandwidth
T
C
= 25°C, V
CC
= 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ
= 0.5V, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), P
LO
= 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
CONDITIONS
EN = 5.0V
EDC = 5.0V
EIP2 = 5.0V
With REF Pin Unloaded
When Driven with External Source
(Note 11)
Unloaded
When Driven with External Source
(Note 11)
For Step Input, Output with 90% of Final Value
DCOI, DCOQ Swept from 0V to 1V, EDC = 5V
Unadjusted, EDC = 0V
Single Ended
100Ω External Pull-Up, –3dB Corner Frequency
MIN
TYP
52
33
50
0.5
0.4 to 0.7
2||1
0.5
0 to 2V
REF
8||1
20
±20
20
V
CC
– 1.5
100||6
530
MAX
UNITS
μA
μA
μA
V
V
kΩ||pF
V
V
kΩ||pF
ns
mV
μV/°C
V
Ω||pF
MHz
V
CM
Z
OUT
BW
BB
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:
Tests are performed with the test circuit of Figure 1.
Note 3:
The LTC5584 is guaranteed to be functional over the –40°C to
105°C case temperature operating range.
Note 4:
DSB noise figure is measured at the baseband frequency of 15MHz
with a small-signal noise source without any filtering on the RF input and
no other RF signal applied.
Note 5:
Performance at the RF frequencies listed is measured with external
RF and LO impedance matching, as shown in the table of Figure 1.
Note 6:
The complementary outputs (I
+
, I
–
and Q
+
, Q
–
) are combined
using a 180° phase-shift combiner.
Note 7:
Noise figure under blocking conditions (NF
BLOCKING
) is measured
at an output noise frequency of 60MHz with an RF input blocking signal at
f
LO
+ 1MHz. Both RF and LO input signals are appropriately filtered, as well
as the baseband output. NF
BLOCKING
measured at f
LO
of 160MHz, 460MHz
and 885MHz.
Note 8:
Voltage conversion gain is calculated from the average measured
power conversion gain of the I and Q outputs using the test circuit shown
in Figure 1. Power conversion gain is measured with a 100Ω differential
load impedance on the I and Q outputs.
Note 9:
Baseband outputs have a 100Ω external pull-up resistor to V
CC
as
shown in the test circuit shown in Figure 1.
Note 10:
Image rejection is calculated from the measured gain error and
phase error using the method listed in the appendix.
Note 11:
The DCOI, DCOQ, IP2I, IP2Q pins have an 8k internal resistor to
ground. The REF pin has a 2k internal resistor to ground. If unconnected,
these pins will float up to 500mV through internal current sources. A low
output resistance voltage source is recommended for driving these pins.
Note 12:
This is the recommended operating range, operation outside the
listed range is possible with degraded performance to some parameters.
Note 13:
DC offset measured differentially between I
+
and I
–
and between
Q
+
and Q
–
. The reported value is the mean of the absolute values of the
characterization data distribution.
Note 14:
Baseband amplitude is within 10% of final value.
Note 15:
Baseband amplitude is at least 30dB down from its on state.
5584f
4
LTC5584
Dc perForMance characTerisTics
EN = 5V, EDC = 0V and EIP2 = 0V. Test circuit shown in Figure 1
Supply Current vs Supply Voltage
260
250
240
SUPPLY CURRENT (mA)
230
220
210
200
190
180
170
160
4.75
5
SUPPLY VOLTAGE (V)
5.25
5585 G01
REF Voltage vs Temperature
550
545
540
REF VOLTAGE (mV)
535
530
525
520
515
510
505
500
–40
–20
40
20
0
60
TEMPERATURE (°C)
80
100
5584 G02
T
C
= –40°C
T
C
= 25°C
T
C
= 85°C
T
C
= 105°C
V
CC
= 4.75V
V
CC
= 5V
V
CC
= 5.25V
Typical perForMance characTerisTics
140MHz application. V
CC
= 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, T
C
= 25°C, P
LO
= 6dBm, f
LO
= 130MHz, f
RF1
= 140MHz, f
RF2
= 141MHz, f
BB
= 10MHz, P
RF1
= P
RF2
= –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
IIP3 and P1dB vs Temperature (T
C
)
50
45
40
IIP3, P1dB (dBm)
35
30
25
20
15
10
80
100
P1dB
120
140
160
180
200
5584 G03
IIP3 and P1dB vs Supply Voltage
(V
CC
)
50
45
40
IIP3, P1dB (dBm)
IIP3 (dBm)
35
30
25
20
15
10
80
100
120
P1dB
140
160
180
200
5584 G04
IIP3 vs LO Power
50
45
40
35
30
25
20
15
10
80
100
120
140
160
180
200
5584 G05
I, –40°C
I, 25°C
I, 85°C
I, 105°C
IIP3
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
I, 4.75V
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
IIP3
T
C
= 25°C
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
T
C
= 25°C
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
5584f
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