LT5500
1.8GHz to 2.7GHz
Receiver Front End
FEATURES
■
■
■
■
■
■
■
■
DESCRIPTIO
1.8V to 5.25V Supply
Dual LNA Gain Setting: +13.5dB/–14dB at 2.5GHz
Double-Balanced Mixer
Internal LO Buffer
LNA Input Internally Matched
Low Supply Current: 23mA
Low Shutdown Current: 2µA
24-Lead Narrow SSOP Package
The LT
®
5500 is a receiver front end IC designed for low
voltage operation. The chip contains a low noise amplifier
(LNA), a Mixer and an LO buffer. The IC is designed to
operate over a power supply voltage range from 1.8V to
5.25V.
The LNA can be set to either high gain or low gain mode.
At 2.5GHz, the high gain mode provides 13.5dB gain and
a noise figure (NF) of 4dB. The LNA in low gain mode
provides –14dB gain and an IIP3 of + 8dBm at 2.5GHz.
The mixer has 5dB of conversion gain and an IIP3 of
– 2.5dBm at 2.5GHz, with –10dBm LO input power.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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IEEE 802.11 and 802.11b DSSS and FHSS
High Speed Wireless LAN
Wireless Local Loop
TYPICAL APPLICATIO
ENABLE
100pF
GAIN
SELECT
100pF
2V
100pF
×2
L4
LNA_IN
GND
LNA_GND
LO
–
LNA_OUT
C4
L2
RF INPUT
FILTER
RF
INPUT
EN
LT5500
GS
14.0
f
RF
= 2.5GHz
13.9 T
A
= 25°C
13.8
13.7
LNA GAIN (dB)
2V
V
CC
1µF
1nF
100pF
×4
MIX_GND
L5
T2
8:1
IF
+
LO
RF
IF
IF
–
LO
+
C17
L3
LO INPUT
13.6
13.5
13.4
13.3
INTERSTAGE
FILTER
MIX_IN
L9
C23
13.2
13.1
13.0
1.5
2
2.5
3
3.5
V
CC
(V)
4
4.5
5
5.5
IF OUTPUT
L7
•
•
2V
100pF
5500 F01
Figure 1. 2.5GHz Receiver. Interstage Filter is Optional
5500f
U
LNA Gain (High Gain Mode)
and Mixer Conversion Gain
6.0
5.8
MIXER CONVERSION GAIN (dB)
U
U
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
5500 TA02
1
LT5500
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER I FOR ATIO
TOP VIEW
EN
V
CC
LNA_IN
GND
LNA_GND
LNA_GND
LNA_GND
LNA_GND
V
CC
1
2
3
4
5
6
7
8
9
24 GS
23 GND
22 LNA_OUT
21 V
CC
20 GND
19 LO
–
18 LO
+
17 V
CC
16 GND
15 MIX_IN
14 GND
13 IF
–
Power Supply Voltage ........................................... 5.5V
LNA RF Input Power ............................................ 5dBm
Mixer RF Input Power ........................................ 10dBm
LO Input Power (Note 2) ................................... 10dBm
All Other Pins ......................................................... 5.5V
Operating Ambient
Temperature Range ............................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
LT5500EGN
MIX_GND 10
GND 11
IF
+
12
GN PACKAGE
24-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 85°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Frequency Range (Note 3)
Forward Gain
Reverse Gain (Isolation)
Noise Figure
Input Return Loss
Output Return Loss
Input 1dB Compression
Input 3rd Order Intercept
LNA Low Gain: EN = 1.35V, GS = 0.3V
Frequency Range (Note 4)
Forward Gain
Reverse Gain (Isolation)
Noise Figure
Input 1dB Compression
Input 3rd Order Intercept
Mixer: EN = 1.35V, GS = 1.35V
RF Frequency Range (Note 4)
Conversion Gain
SSB Noise Figure
Input P1dB
Input 3rd Order Intercept
LNA High Gain: EN = 1.35V, GS = 1.35V
(Test circuit shown in Figure 3 for 1.8GHz application) V
CC
= 3V DC,
LNA: f
LNA_IN
= 1.8GHz, Mixer: f
MIX_IN
= 1.8GHz, f
LO
= 1.52GHz, P
LO
= –10dBm, T
A
= 25°C, unless otherwise noted. (Notes 3, 4)
CONDITIONS
MIN
TYP
1.8 to 2.7
15.5
Terminated 50Ω Source
No External Matching
With External Matching
Two Tone Test,
∆f
= 2MHz
–18
18.5
–39
2.5
10.5
15
–24
–12
1.8 to 2.7
–13
–10
–34
16.5
0
Two Tone Test,
∆f
= 2MHz
4.5
9
1.8 to 2.7
5.5
Terminated 50Ω Source
Two Tone Test,
∆f
= 2MHz
–6
8.5
7.5
–13
– 2.5
MAX
UNITS
GHz
dB
dB
dB
dB
dB
dBm
dBm
GHz
dB
dB
dB
dBm
dBm
GHz
dB
dB
dBm
dBm
5500f
2
U
W
U
U
W W
W
LT5500
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
LO Frequency Range (Note 4)
IF Frequency Range (Note 3)
LO-IF Isolation
LO-RF Isolation
RF-LO Isolation
(Test circuit shown in Figure 3 for 1.8GHz application) V
CC
= 3V DC,
LNA: f
LNA_IN
= 1.8GHz, Mixer: f
MIX_IN
= 1.8GHz, f
LO
= 1.52GHz, P
LO
= –10dBm, T
A
= 25°C, unless otherwise noted. (Notes 3, 4)
CONDITIONS
Matching Required
Matching Required
MIN
TYP
MAX
0.01 to 3.15
10 to 450
36
36
40
UNITS
GHz
MHz
dB
dB
dB
(Test circuit shown in Figure 3 for 2.5GHz application) V
CC
= 3V DC, LNA: f
LNA_IN
= 2.5GHz, Mixer: f
MIX_IN
= 2.5GHz, f
LO
= 2.22GHz,
P
LO
= –10dBm, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER
LNA High Gain: EN = 1.35V, GS = 1.35V
Forward Gain
Reverse Gain (Isolation)
Noise Figure
Input Return Loss
Output Return Loss
Input 1dB Compression
Input 3rd Order Intercept
LNA Low Gain: EN = 1.35V, GS = 0.3V
Forward Gain
Reverse Gain (Isolation)
Noise Figure
Input 1dB Compression
Input 3rd Order Intercept
Mixer: EN = 1.35V, GS = 1.35V
Conversion Gain
SSB Noise Figure
Input P1dB
Input 3rd Order Intercept
LO-IF Isolation
LO-RF Isolation
RF-LO Isolation
CONDITIONS
MIN
TYP
13.5
–35
4
12
15
–15
–3.5
–14
–39
19
–1
8
5
9.5
–11
– 2.5
33
37
32
MAX
UNITS
dB
dB
dB
dB
dB
dBm
dBm
dB
dB
dB
dBm
dBm
dB
dB
dBm
dBm
dB
dB
dB
Terminated 50Ω Source
No External Matching
With External Matching
Two Tone Test,
∆f
= 2MHz
Two Tone Test,
∆f
= 2MHz
Terminated 50Ω Source
Two Tone Test,
∆f
= 2MHz
V
CC
= 3V DC, T
A
= 25°C (Note 4)
SYMBOL PARAMETER
Power Supply
V
CC
Supply Voltage
I
CC
HG
Rx High Gain Mode
I
CC
LG
Rx Low Gain Mode
I
CC
Off
Shutdown Current
I
EN
Enable Current
I
GS
Gain Select Current
CONDITIONS
MIN
TYP
1.8 to 5.25
23
18
2
21
21
MAX
UNITS
V
mA
mA
µA
µA
µA
EN = 1.35V, GS = 1.35V
EN = 1.35V, GS = 0.3V
EN = 0.3V, GS = 0.3V
EN = 1.35V (Note 5)
GS = 1.35V (Note 6)
33
31
25
Note 1:
Absolute Maximum Ratings are those values beyond which the life of
the device may be impaired.
Note 2:
LO Absolute Maximum Ratings apply for each LO pin separately.
Note 3:
Component values listed in Figure 3 for 1.8GHz evaluation board were
used to guarantee 1.8GHz performance.
Note 4:
Specifications over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical process
controls.
Note 5:
When EN
≤
0.3V, enable current is <10µA.
Note 6:
When GS
≤
0.3V, gain select current is <10µA.
5500f
3
LT5500
TYPICAL PERFOR A CE CHARACTERISTICS
LNA Gain vs Supply Voltage and
Temperature (High Gain Mode)
20
19
18
85°C, 1.8GHz
IIP3 (dBm)
–40°C, 1.8GHz
25°C, 1.8GHz
NOISE FIGURE (dB)
GAIN (dB)
17
16
15
25°C, 2.5GHz
14
13
12
1.5
2
–40°C, 2.5GHz
85°C, 2.5GHz
2.5 3 3.5 4 4.5
SUPPLY VOLTAGE (V)
LNA Gain vs Supply Voltage and
Temperature (Low Gain Mode)
–10.0
–10.5
–11.0
25°C, 1.8GHz
–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
–14.5
1.5
85°C, 2.5GHz
2
2.5 3 3.5 4 4.5
SUPPLY VOLTAGE (V)
5
5.5
25°C, 2.5GHz
85°C, 1.8GHz
–40°C, 2.5GHz
IIP3 (dBm)
–40°C, 1.8GHz
GAIN (dB)
25°C, 1.8GHz
8
85°C, 2.5GHz
25°C, 2.5GHz
NOISE FIGURE (dB)
Mixer Conversion Gain vs Supply
Voltage and Temperature
10
9
–40°C, 1.8GHz
25°C, 1.8GHz
CONVERSION GAIN (dB)
8
7
6
5
IIP3 (dBM)
–1
–2
85°C, 1.8GHz
25°C, 2.5GHz
25°C, 1.8GHz
NOISE FIGURE (dB)
85°C, 1.8GHz
25°C, 2.5GHz
–40°C, 2.5GHz
85°C, 2.5GHz
4
1.5
2
4 4.5
2.5 3 3.5
SUPPLY VOLTAGE (V)
5
5.5
4
U W
5
5500 G01
5500 G04
LNA IIP3 vs Supply Voltage and
Temperature (High Gain Mode)
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
85°C, 1.8GHz
–40°C, 1.8GHz
25°C, 1.8GHz
25°C, 2.5GHz
–40°C, 2.5GHz
LNA Noise Figure vs Supply
Voltage (High Gain Mode)
4.5
T
A
= 25°C
2.5GHz
85°C, 2.5GHz
4.0
3.5
3.0
1.8GHz
2.5
5.5
1.5
2
3 3.5
2.5
4 4.5
SUPPLY VOLTAGE (V)
5
5.5
2.0
1.5
2
4 4.5
2.5 3 3.5
SUPPLY VOLTAGE (V)
5
5.5
5500 G02
5500 G03
LNA IIP3 vs Supply Voltage and
Temperature (Low Gain Mode)
12
85°C, 1.8GHz
10
19.5
19.0
18.5
18.0
17.5
17.0
16.5
LNA Noise Figure vs Supply
Voltage (Low Gain Mode)
T
A
= 25°C
2.5GHz
6
–40°C, 1.8GHz
1.8GHz
–40°C, 2.5GHz
4
1.5
2
4 4.5
2.5 3 3.5
SUPPLY VOLTAGE (V)
5
5.5
16.0
1.5
2.5
4.5
SUPPLY VOLTAGE (V)
3.5
5.5
5500 G06
5500 G05
Mixer IIP3 vs Supply Voltage and
Temperature
2
1
0
9.0
8.5
8.0
10.0
Mixer SSB Noise Figure
vs Supply Voltage
T
A
= 25°C
2.5GHz
85°C, 2.5GHz
9.5
–3
–4
–5
–6
1.5
2
–40°C, 1.8GHz
1.8GHz
7.5
–40°C, 2.5GHz
2.5 3 3.5 4 4.5
SUPPLY VOLTAGE (V)
5
5.5
7.0
1.5
2
4 4.5
2.5 3 3.5
SUPPLY VOLTAGE (V)
5
5.5
5500 G07
5500 G08
5500 G09
5500f
LT5500
TYPICAL PERFOR A CE CHARACTERISTICS
Mixer Conversion Gain
vs LO Power
9
8
1.8GHz
CONVERSION GAIN (dB)
7
6
5
4
3
2
1
0
0
IF = 280MHz
V
CC
= 3V
T
A
= 25°C
–5
–10
–15
–20
P(LO) (dBm)
–25
–30
IIP3 (dBm)
2.5GHz
NOISE FIGURE (dB)
LNA Input Return Loss
vs Supply Voltage
15
RF = 2.5GHz
14 T
A
= 25°C
13
RETURN LOSS (dB)
12
11
10
9
8
7
6
1.5
2.5
3.5
V
CC
(V)
5500 G13
HIGH GAIN
RETURN LOSS (dB)
RETURN LOSS (dB)
LOW GAIN
4.5
LNA Output Return Loss
vs Temperature
20
18
RETURN LOSS (dB)
RF = 2.5GHz
V
CC
= 3V
HIGH GAIN
16
I
CC
(mA)
14
12
10
8
6
–50
LOW GAIN
23
21
19
17
I
CC
(mA)
50
0
TEMPERATURE (°C)
U W
5500 G10
Mixer IIP3 vs LO Power
–1.0
–1.2
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
–2.6
–2.8
–3.0
0
–5
–15
–20
–10
P(LO) (dBm)
–25
–30
2.5GHz
1.8GHz
IF = 280MHz
V
CC
= 3V
T
A
= 25°C
15
14
13
12
11
Mixer SSB Noise Figure
vs LO Power
IF = 280MHz
V
CC
= 3V
T
A
= 25°C
2.5GHz
10
9
1.8GHz
8
7
0
–5
–10
–20
–15
P(LO) (dBm)
–25
–30
5500 G11
5500 G12
LNA Input Return Loss
vs Temperature
18
16
HIGH GAIN
14
12
10
8
LOW GAIN
6
–50
RF = 2.5GHz
V
CC
= 3V
LNA Output Return Loss
vs Supply Voltage
24
RF = 2.5GHz
22 T
A
= 25°C
20
18
16
14
12
10
8
100
5500 G14
HIGH GAIN
LOW GAIN
5.5
0
50
TEMPERATURE (°C)
6
1.5
2.5
3.5
V
CC
(V)
4.5
5.5
5500 G15
I
CC
vs Supply Voltage
(High Gain Mode)
31
29
27
25
25°C
85°C
28
26
24
22
20
I
CC
vs Supply Voltage
(Low Gain Mode)
85°C
25°C
18
16
–40°C
14
–40°C
100
5500 G16
15
1.5
2.5
3.5
V
CC
(V)
4.5
5.5
5500 G17
12
1.5
2.5
3.5
V
CC
(V)
4.5
5.5
5500 G18
5500f
5
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