LT5512
1kHz-3GHz High Signal Level
Down-Converting Mixer
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Broadband RF, LO and IF Operation
High Input IP3: +21dBm at 900MHz
+17dBm at 1900MHz
Typical Conversion Gain: 1dB at 1900MHz
SSB Noise Figure: 11dB at 900MHz
14dB at 1900MHz
Integrated LO Buffer: Insensitive to LO Drive Level
Single-Ended or Differential LO Signal
High LO-RF Isolation
Enable Function
4.5V to 5.25V Supply Voltage Range
4mm
×
4mm QFN Package
The LT
®
5512 is a broadband mixer IC optimized for high
linearity downconverter applications including cable and
wireless infrastructure. The IC includes a differential LO
buffer amplifier driving a double-balanced mixer. An inte-
grated RF buffer amplifier improves LO-RF isolation and
eliminates the need for precision external bias resistors.
The LT5512 is a high-linearity alternative to passive diode
mixers. Unlike passive mixers, which have conversion
loss and require high LO drive levels, the LT5512 delivers
conversion gain and requires significantly lower LO drive
levels.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Cellular/PCS/UMTS Infrastructure
CATV Downlink Infrastructure
High Linearity Mixer Applications
ISM Band Receivers
TYPICAL APPLICATIO
High Signal-Level Downmixer for Wireless Infastructure
5V
100pF
1850MHz
TO
1910MHz
LNA
1.5pF
1850MHz
TO
1910MHz
EN
1:2
RF
+
1µF
V
CC1
LT5512
V
CC2
+
IF
220nH
100pF
P
OUT
, IM3 (dBm/TONE)
70MHz
(TYP)
IF
VGA
LTC1748
ADC
IF –
RF –
8.2pF
220nH
LO
+
LO–
LO
INPUT
–10dBm
100pF
5.6nH
100pF
5512 F01a
U
Output IF Power and Output IM3 vs
RF Input Power (Two Input Tones)
10
0
–10
–20
–30
–40
–50
–60
–70
IM3
IF
OUT
–80
3
–21 –18 –15 –12 –9 –6 –3 0
RF INPUT POWER (dBm/TONE)
T
A
= 25°C
P
LO
= –10dBm
f
LO
= 1830MHz
f
RF1
= 1899.9MHz
f
RF2
= 1900.1MHz
6
5512 F01b
U
U
5512f
1
LT5512
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
LO
–
LO
+
NC
NC
Supply Voltage ....................................................... 5.5V
Enable Voltage ............................... –0.3V to V
CC
+ 0.3V
LO
+
to LO
–
Differential Voltage ............................
±1.5V
................................................... (+6dBm equivalent)
+
to RF
–
Differential Voltage .............................
±0.7V
RF
.................................................. (+10dBm equivalent)
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
Junction Temperature (T
J
)................................... 125°C
ORDER PART
NUMBER
LT5512EUF
12 GND
11 IF
+
10 IF
–
9
GND
16 15 14 13
NC 1
RF
+
2
RF
–
3
NC 4
5
EN
17
6
V
CC1
7
V
CC2
8
NC
PART MARKING
5512
UF PACKAGE
16-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD IS GROUND (PIN 17)
(MUST BE SOLDERED TO PCB)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
RF Input Frequency Range
2
LO Input Frequency Range
2
IF Output Frequency Range
2
CONDITIONS
Requires Appropriate Matching
Requires Appropriate Matching
Requires Appropriate Matching
MIN
TYP
0.001 to 3000
0.001 to 3000
0.001 to 2000
MAX
UNITS
MHz
MHz
MHz
Downmixer Application: (Test Circuit Shown in Figure 2) V
CC
= 5V
DC
, EN = High, T
A
= 25°C, P
RF
= –10dBm (–10dBm/tone for two-tone
IIP3 tests,
∆f
= 200kHz), f
LO
= f
RF
– 170MHz, P
LO
= –10dBm, IF output measured at 170MHz, unless otherwise noted. (Notes 2, 3)
PARAMETER
Conversion Gain
Conversion Gain vs Temperature
Input 3rd Order Intercept
Single-Sideband Noise Figure
LO to RF Leakage
LO to IF Leakage
RF to LO Isolation
2RF-2LO Output Spurious Product
(f
RF
= f
LO
+ f
IF/2
)
3RF-3LO Output Spurious Product
(f
RF
= f
LO
+ f
IF/3
)
Input 1dB Compression
CONDITIONS
f
RF
= 900MHz
f
RF
= 1900MHz
T
A
= – 40°C to 85°C
f
RF
= 900MHz
f
RF
= 1900MHz
f
RF
= 900MHz
f
RF
= 1900MHz
f
LO
= 730MHz
f
LO
= 1730MHz
f
LO
= 730MHz and 1730MHz
f
RF
= 900MHz
f
RF
= 1900MHz
900MHz: f
RF
= 815MHz at –12dBm
1900MHz: f
RF
= 1815MHz at –12dBm
900MHz: f
RF
= 786.67MHz at –12dBm
1900MHz: f
RF
= 1786.67MHz at –12dBm
f
RF
= 900MHz
f
RF
= 1900MHz
MIN
–1
TYP
0
1
–0.011
21
17
11
14
–60
–53
–46
57
50
–66
–59
–83
–58
10.1
6.2
MAX
UNITS
dB
dB
dB/°C
dBm
dBm
dB
dB
dBm
dBm
dBm
dB
dB
dBc
dBc
dBc
dBc
dBm
dBm
2
U
5512f
W
U
U
W W
W
LT5512
1230MHz Cable Infrastructure Downmixer Application: (Test Circuit Shown
in Figure 3) V
CC
= 5V
DC
, EN = High, T
A
= 25°C, RF input = 1230MHz at –10dBm, LO input swept from 1500MHz to 2100MHz,
P
LO
= –10dBm, IF output measured from 270MHz to 870MHz, unless otherwise noted.
PARAMETER
Conversion Gain
Input 3rd Order Intercept
LO to RF Leakage
LO to IF Leakage
RF to LO Isolation
2RF – LO Output Spurious Product
Single-Sideband Noise Figure
f
IF
= 570MHz, P
RF
= –18dBm, f
LO
= 1800MHz
f
LO
= 1800MHz, f
IF
= 570MHz
CONDITIONS
f
LO
= 1800MHz, f
IF
= 570MHz
2-Tone RF Input, –10dBm/Tone,
∆f
= 1MHz,
f
LO
= 1800MHz, f
IF
= 570MHz
MIN
TYP
2.8
17.9
–56
– 40
51
– 60
13.3
MAX
UNITS
dB
dBm
dBm
dBm
dB
dBc
dB
ELECTRICAL CHARACTERISTICS
DC ELECTRICAL CHARACTERISTICS
(Note 3), unless otherwise noted.
PARAMETER
Enable (EN) Low = Off, High = On
Turn On Time
Turn Off Time
Input Current
Enable = High (On)
Enable = Low (Off)
Power Supply Requirements (V
CC
)
Supply Voltage
Supply Current
Shutdown Current
EN = Low
(Test Circuit Shown in Figure 2) V
CC
= 5V
DC
, EN = High, T
A
= 25°C
MIN
TYP
3
13
MAX
UNITS
µs
µs
µA
V
DC
0.3
4.50
57
5.25
74
100
V
DC
V
DC
mA
µA
CONDITIONS
V
ENABLE
= 5V
DC
3
50
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
External components on the final test circuit are optimized for
operation at f
RF
= 1900MHz, f
LO
= 1730MHz and f
IF
= 170MHz (Figure 2).
Note 3:
Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
controls.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
59
58
56
55
54
53
52
51
50
49
4.5
4.75
5.25
5.0
SUPPLY VOLTAGE (V)
5.5
5512 G01
SHUTDOWN CURRENT (µA)
57
SUPPLY CURRENT (mA)
U W
(Test Circuit Shown in Figure 2)
Shutdown Current vs Supply Voltage
100
T
A
= 85°C
T
A
= 25°C
10
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
1
T
A
= –40°C
0.1
4.5
5.0
5.25
4.75
SUPPLY VOLTAGE (V)
5.5
5512 G02
5512f
3
LT5512
TYPICAL PERFOR A CE CHARACTERISTICS
Conv Gain, IIP3 and SSB NF vs
RF Frequency (Low-Side LO)
18
18
CONV GAIN (dB), NF (dB), IIP3 (dBm)
(1900MHz Downmixer Application)
V
CC
= 5V
DC
, EN = High, T
A
= 25°C, 1900MHz RF input matching, RF input = 1900MHz at –10dBm, LO input = 1730MHz at –10dBm, IF
output measured at 170MHz, unless otherwise noted. (Test circuit shown in Figure 2).
Conv Gain, IIP3 and SSB NF vs
RF Frequency (High-Side LO)
20
IIP3
SSB NF
f
IF
= 170MHz
T
A
= 25°C
CONV GAIN (dB), IIP3 (dBm)
CONV GAIN (dB), NF (dB), IIP3 (dBm)
16
14
12
10
8
6
4
2
0
1700
IIP3
SSB NF
f
IF
= 170MHz
T
A
= 25°C
CONV GAIN
1900
2000
1800
RF FREQUENCY (MHz)
2100
5512 • G03
Conv Gain and IIP3 vs
LO Input Power
20
18
T
A
= 25°C
T
A
= –40°C
IIP3
T
A
= 85°C
SSB NF (dB)
CONV GAIN (dB), IIP3 (dBm)
16
14
12
10
8
6
4
2
CONV GAIN
T
A
= –40°C
LO LEAKAGE (dBm)
T
A
= 25°C T
A
= 85°C
0
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
Conv Gain and IIP3 vs
Supply Voltage
18
16
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
IIP3
P
OUT
, IM3 (dBm/TONE)
CONV GAIN (dB), IIP3 (dBm)
14
12
10
8
6
4
2
0
4.5
CONV GAIN
T
A
= –40°C
RETURN LOSS (dB)
T
A
= 25°C
4.75
5.25
5.0
SUPPLY VOLTAGE (V)
4
U W
–4
5512 • G06
Conv Gain and IIP3 vs Temperature
RF = 1900MHz, IF = 170MHz
18
16
14
12
10
8
6
4
2
0
2100
–50
–25
CONV GAIN
HIGH-SIDE LO
LOW-SIDE LO
0
25
50
TEMPERATURE (°C)
75
100
IIP3
LOW-SIDE LO
HIGH-SIDE LO
16
14
12
10
8
6
4
2
0
1700
CONV GAIN
1800
2000
1900
RF FREQUENCY (MHz)
5512 • G04
5512 • G05
SSB Noise Figure vs
LO Input Power
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
–2
12.0
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4
–2
LOW-SIDE LO
HIGH-SIDE LO
f
RF
= 1900MHz
f
IF
= 170MHz
T
A
= 25°C
–20
–25
–30
–35
–40
–45
–50
LO-IF and LO-RF Leakage vs
LO Input Power
f
LO
= 1730MHz
T
A
= 25°C
LO-IF
LO-RF
–55
–60
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4
–2
5512 • G07
5512 • G08
Output IF Power and Output IM3 vs
RF Input Power (Two Input Tones)
10
0
–10 P
OUT
–20
–30
–40
–50
–60
–70
–80
5.5
5512 • G09
RF, LO and IF Port Return Loss
vs Frequency
0
T
A
= –40°C
–5
T
A
= 85°C
T
A
= 25°C
T
A
= 85°C
–10
–15
IF
–20
RF
–25
–30
LO
IM3
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
–90
0
–21 –18 –15 –12 –9 –6 –3
RF INPUT POWER (dBm/TONE)
T
A
= 25°C
0
500
1000 1500 2000
FREQUENCY (MHz)
2500
3000
3
5512 G10
5512 G11
5512f
LT5512
TYPICAL PERFOR A CE CHARACTERISTICS
IF Output Power, 2RF-2LO and
3RF-3LO vs RF Input Power
T
A
= 25°C
f
LO
= 1730MHz
–10 P
LO
= –10dBm
IF OUTPUT POWER (dBm)
(1900MHz Downmixer Application, continued)
V
CC
= 5V
DC
, EN = High, T
A
= 25°C, 1900MHz RF input matching, RF input = 1900MHz at –10dBm, LO input = 1730MHz at –10dBm, IF
output measured at 170MHz, unless otherwise noted. (Test circuit shown in Figure 2).
2RF-2LO (Half-IF) Spur Level vs
LO Input Power
–50
–55
SPUR LEVEL (dBm)
10
P
OUT
(RF = 1900MHz)
–30
–50
–70
–90
SPUR LEVEL (dBm)
3RF-3LO
(RF = 1786.67MHz)
2RF-2LO
(RF = 1815MHz)
–110
–22 –19 –16 –13 –10 –7 –4
RF INPUT POWER (dBm)
(1230MHz Cable Infrastructure Downmixer Application) V
CC
= 5V
DC
, EN = High, T
A
= 25°C, RF input = 1230MHz at –10dBm, LO input
swept from = 1500MHz to 2100MHz, P
LO
= –10dBm, IF output measured from 270MHz to 870MHz, unless otherwise noted. (Test circuit
shown in Figure 3.)
Conv Gain, IIP3 and SSB NF
vs IF Output Frequency
20
CONV GAIN (dB), NF (dB), IIP3 (dBm)
18
16
14
12
10
8
6
4
2
0
270
CONV GAIN
T
A
= –40°C
T
A
= 85°C
470
570
770
370
670
IF OUTPUT FREQUENCY (MHz)
870
5512 G12
IIP3
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
dBm
dBm
SSB NF
T
A
= 25°C
T
A
= 25°C
Conv Gain, IIP3 and SSB NF
vs LO Input Power
20
T
A
= 85°C
IIP3
16
14
12
10
8
6
4
2
–20
–15
–5
–10
LO INPUT POWER (dBm)
0
5512 G15
CONV GAIN (dB), IIP3 (dBm), NF (dB)
T
A
= 25°C
T
A
= –40°C
CONV GAIN (dB), IIP3 (dBm), NF (dB)
18
14
12
10
8
6
4
2
CONV GAIN
RETURN LOSS (dB)
SSB NF
T
A
= 25°C
f
LO
= 1800MHz
f
IF
= 570MHz
CONV GAIN
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
U W
–1
3RF-3LO Spur Level vs
LO Input Power
–50
–55
–60
–65
–70
–75
–80
–85
P
RF
= –16dBm
P
RF
= –10dBm
T
A
= 25°C
f
LO
= 1730MHz
f
RF
= 1786.67MHz
T
A
= 25°C
f
LO
= 1730MHz
f
RF
= 1815MHz
–60
–65
–70
–75
–80
–85
P
RF
= –16dBm
P
RF
= –10dBm
2
5512 G18
–90
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4
–2
5512 G19
–90
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4
–2
5512 G20
LO Leakage vs LO Frequency
–10
–20
–30
LO-IF
–40
–50
LO-RF
–60
–70
1500
IF Output Power and 2RF-LO Spur
vs RF Input Power
10
0
–10
–20
–30
–40
–50
–60
–70
–80
T
A
= 25°C
f
LO
= 1800MHz
f
IF
= 570MHz
–3
0
5512 G14
T
A
= –40°C
P
OUT
T
A
= 25°C
T
A
= –40°C
2RF-LO
T
A
= 85°C
T
A
= 85°C
1600
1700 1800 1900 2000
LO FREQUENCY (MHz)
2100
5512 G13
–90
–21 –18
–15 –12 –9
–6
RF INPUT POWER (dBm)
Conv Gain and IIP3 vs
Temperature
20
18
IIP3
16
5V
DC
f
LO
= 1800MHz
f
IF
= 570MHz
5.5V
DC
4.5V
DC
RF, LO and IF Port Return Losses
vs Frequency
0
–5
IF
–10
–15
–20
–25
RF
LO
4.5, 5.0 AND 5.5V
DC
–50 –35 –20 –5 10 25 40 55
TEMPERATURE (°C)
70
85
–30
0
500
5512 G16
1000
1500
2000
FREQUENCY (MHz)
2500
5512 G17
5512f
5
京公网安备 11010802033920号
EEWORLD
