LT5500EGN [Linear]
1.8GHz to 2.7GHz Receiver Front End; 为1.8GHz至2.7GHz接收机前端
| 型号： | LT5500EGN |
| 厂家： | 
Linear |
| 描述： | 1.8GHz to 2.7GHz Receiver Front End |
| 文件： | 总12页 (文件大小：297K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT5500
1.8GHz to 2.7GHz
Receiver Front End
U
DESCRIPTIO
FEATURES
■
1.8V to 5.25V Supply
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.
■
Dual LNA Gain Setting: +13.5dB/–14dB at 2.5GHz
■
Double-Balanced Mixer
■
Internal LO Buffer
■
LNA Input Internally Matched
■
Low Supply Current: 23mA
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.
■
Low Shutdown Current: 2µA
■
24-Lead Narrow SSOP Package
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APPLICATIO S
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.
■
IEEE 802.11 and 802.11b DSSS and FHSS
■
High Speed Wireless LAN
■
Wireless Local Loop
U
TYPICAL APPLICATIO
GAIN
SELECT
ENABLE
100pF
100pF
2V
LNA Gain (High Gain Mode)
and Mixer Conversion Gain
100pF
×2
LT5500
EN
GS
RF INPUT
FILTER
L4
14.0
13.9
13.8
13.7
13.6
13.5
13.4
13.3
13.2
13.1
13.0
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
L2
f
= 2.5GHz
= 25°C
LNA_IN
LNA_OUT
RF
A
RF
T
INPUT
GND
C4
–
LO
LNA_GND
L3
INTERSTAGE
FILTER
C17
+
LO
2V
LO INPUT
V
CC
100pF
1µF
1nF
×4
L9
LO
MIX_GND
MIX_IN
–
RF
IF
C23
+
L5
3.5
(V)
4
1.5
2
2.5
3
4.5
5
5.5
IF
IF
V
CC
T2
8:1
5500 TA02
2V
IF OUTPUT
•
•
L7
100pF
5500 F01
Figure 1. 2.5GHz Receiver. Interstage Filter is Optional
5500f
1
LT5500
W W U W
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ABSOLUTE MAXIMUM RATINGS
/O
PACKAGE RDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
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
NUMBER
1
2
GS
24
23
22
21
20
19
18
17
16
15
14
13
EN
GND
V
CC
LT5500EGN
3
LNA_OUT
LNA_IN
4
V
GND
LNA_GND
LNA_GND
LNA_GND
LNA_GND
CC
5
GND
–
6
LO
+
7
LO
8
V
CC
9
GND
V
CC
10
11
12
MIX_IN
MIX_GND
GND
GND
–
+
IF
IF
GN PACKAGE
24-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 85°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
(Test circuit shown in Figure 3 for 1.8GHz application) VCC = 3V DC,
LNA: fLNA_IN = 1.8GHz, Mixer: fMIX_IN = 1.8GHz, fLO = 1.52GHz, PLO = –10dBm, TA = 25°C, unless otherwise noted. (Notes 3, 4)
SYMBOL PARAMETER
LNA High Gain: EN = 1.35V, GS = 1.35V
Frequency Range (Note 3)
Forward Gain
CONDITIONS
MIN
TYP
MAX
UNITS
1.8 to 2.7
18.5
–39
GHz
dB
15.5
Reverse Gain (Isolation)
Noise Figure
dB
Terminated 50Ω Source
No External Matching
With External Matching
2.5
dB
Input Return Loss
10.5
15
dB
Output Return Loss
dB
Input 1dB Compression
Input 3rd Order Intercept
LNA Low Gain: EN = 1.35V, GS = 0.3V
Frequency Range (Note 4)
Forward Gain
–24
dBm
dBm
Two Tone Test, ∆f = 2MHz
–18
–13
–12
1.8 to 2.7
GHz
dB
–10
–34
16.5
0
Reverse Gain (Isolation)
Noise Figure
dB
dB
Input 1dB Compression
Input 3rd Order Intercept
Mixer: EN = 1.35V, GS = 1.35V
RF Frequency Range (Note 4)
Conversion Gain
dBm
dBm
Two Tone Test, ∆f = 2MHz
4.5
5.5
–6
9
1.8 to 2.7
8.5
GHz
dB
SSB Noise Figure
Terminated 50Ω Source
7.5
dB
Input P1dB
–13
dBm
dBm
5500f
Input 3rd Order Intercept
Two Tone Test, ∆f = 2MHz
–2.5
2
LT5500
ELECTRICAL CHARACTERISTICS
(Test circuit shown in Figure 3 for 1.8GHz application) VCC = 3V DC,
LNA: fLNA_IN = 1.8GHz, Mixer: fMIX_IN = 1.8GHz, fLO = 1.52GHz, PLO = –10dBm, TA = 25°C, unless otherwise noted. (Notes 3, 4)
SYMBOL PARAMETER
LO Frequency Range (Note 4)
CONDITIONS
MIN
TYP
0.01 to 3.15
10 to 450
36
MAX
UNITS
GHz
MHz
dB
Matching Required
Matching Required
IF Frequency Range (Note 3)
LO-IF Isolation
LO-RF Isolation
36
dB
RF-LO Isolation
40
dB
(Test circuit shown in Figure 3 for 2.5GHz application) VCC = 3V DC, LNA: fLNA_IN = 2.5GHz, Mixer: fMIX_IN = 2.5GHz, fLO = 2.22GHz,
LO = –10dBm, TA = 25°C, unless otherwise noted.
P
SYMBOL PARAMETER
LNA High Gain: EN = 1.35V, GS = 1.35V
Forward Gain
CONDITIONS
MIN
TYP
MAX
UNITS
13.5
–35
4
dB
dB
Reverse Gain (Isolation)
Noise Figure
Terminated 50Ω Source
No External Matching
With External Matching
dB
Input Return Loss
12
dB
Output Return Loss
Input 1dB Compression
Input 3rd Order Intercept
LNA Low Gain: EN = 1.35V, GS = 0.3V
Forward Gain
15
dB
–15
–3.5
dBm
dBm
Two Tone Test, ∆f = 2MHz
–14
–39
19
dB
dB
Reverse Gain (Isolation)
Noise Figure
dB
Input 1dB Compression
Input 3rd Order Intercept
Mixer: EN = 1.35V, GS = 1.35V
Conversion Gain
–1
8
dBm
dBm
Two Tone Test, ∆f = 2MHz
5
9.5
–11
–2.5
33
dB
dB
SSB Noise Figure
Terminated 50Ω Source
Input P1dB
dBm
dBm
dB
Input 3rd Order Intercept
LO-IF Isolation
Two Tone Test, ∆f = 2MHz
LO-RF Isolation
37
dB
RF-LO Isolation
32
dB
VCC = 3V DC, TA = 25°C (Note 4)
SYMBOL PARAMETER
Power Supply
CONDITIONS
MIN
TYP
MAX
UNITS
V
Supply Voltage
1.8 to 5.25
V
mA
mA
µA
CC
I
I
I
I
I
HG
LG
Off
Rx High Gain Mode
Rx Low Gain Mode
Shutdown Current
Enable Current
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)
23
18
2
33
31
25
CC
CC
CC
EN
GS
21
21
µA
Gain Select Current
µA
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 4: Specifications over the –40°C to 85°C operating temperature range
areassuredbydesign,characterizationandcorrelationwithstatisticalprocess
controls.
Note 5: When EN ≤ 0.3V, enable current is <10µA.
Note 3: Component values listed in Figure 3 for 1.8GHz evaluation board were
used to guarantee 1.8GHz performance.
Note 6: When GS ≤ 0.3V, gain select current is <10µA.
5500f
3
LT5500
TYPICAL PERFOR A CE CHARACTERISTICS
U W
LNA Noise Figure vs Supply
Voltage (High Gain Mode)
LNA IIP3 vs Supply Voltage and
Temperature (High Gain Mode)
LNA Gain vs Supply Voltage and
Temperature (High Gain Mode)
0
–2
20
19
18
17
16
15
14
13
12
4.5
–40°C, 2.5GHz
25°C, 2.5GHz
T = 25°C
A
–40°C, 1.8GHz
25°C, 1.8GHz
2.5GHz
–4
4.0
3.5
85°C, 2.5GHz
–6
85°C, 1.8GHz
–40°C, 1.8GHz
25°C, 1.8GHz
–8
–10
–12
–14
–16
–18
–20
3.0
2.5
2.0
85°C, 1.8GHz
25°C, 2.5GHz
–40°C, 2.5GHz
1.8GHz
3.5
85°C, 2.5GHz
1.5
3.5
4.5
5
2
2.5
3
4
5.5
3.5
4
1.5
2
2.5
3
4.5
5
5.5
1.5
2
2.5
3
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
5500 G02
5500 G01
5500 G03
LNA Gain vs Supply Voltage and
Temperature (Low Gain Mode)
LNA IIP3 vs Supply Voltage and
Temperature (Low Gain Mode)
LNA Noise Figure vs Supply
Voltage (Low Gain Mode)
19.5
19.0
18.5
–10.0
–10.5
–11.0
–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
–14.5
12
10
8
T
= 25°C
A
2.5GHz
–40°C, 1.8GHz
85°C, 1.8GHz
25°C, 1.8GHz
85°C, 1.8GHz
85°C, 2.5GHz
25°C, 1.8GHz
18.0
17.5
17.0
16.5
16.0
25°C, 2.5GHz
–40°C, 2.5GHz
–40°C, 1.8GHz
6
25°C, 2.5GHz
85°C, 2.5GHz
1.8GHz
3.5
–40°C, 2.5GHz
4
1.5
3.5
4
4.5
2
2.5
3
3.5
4
4.5
5
5.5
2.5
5.5
1.5
2
2.5
3
5
5.5
1.5
4.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
5500 G04
5500 G05
5500 G06
Mixer Conversion Gain vs Supply
Voltage and Temperature
Mixer IIP3 vs Supply Voltage and
Temperature
Mixer SSB Noise Figure
vs Supply Voltage
2
10
9
10.0
9.5
9.0
8.5
8.0
7.5
7.0
T
= 25°C
A
2.5GHz
1
0
–40°C, 1.8GHz
25°C, 1.8GHz
85°C, 2.5GHz
85°C, 1.8GHz
25°C, 2.5GHz
8
–1
–2
–3
–4
–5
–6
85°C, 1.8GHz
7
25°C, 1.8GHz
25°C, 2.5GHz –40°C, 2.5GHz
6
–40°C, 1.8GHz
–40°C, 2.5GHz
1.8GHz
3.5
5
85°C, 2.5GHz
4
4
4.5
3.5
4
4
4.5
1.5
2
2.5
3
3.5
5
5.5
1.5
2
2.5
3
4.5
5
5.5
1.5
2
2.5
3
5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
5500 G07
5500 G08
5500 G09
5500f
4
LT5500
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TYPICAL PERFOR A CE CHARACTERISTICS
Mixer Conversion Gain
vs LO Power
Mixer SSB Noise Figure
vs LO Power
Mixer IIP3 vs LO Power
9
8
7
6
5
4
3
2
1
–1.0
–1.2
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
–2.6
–2.8
–3.0
15
14
13
12
IF = 280MHz
IF = 280MHz
V
T
= 3V
V
T
= 3V
1.8GHz
CC
A
CC
A
= 25°C
= 25°C
2.5GHz
11
10
2.5GHz
1.8GHz
–20
1.8GHz
2.5GHz
9
8
7
IF = 280MHz
V
A
= 3V
CC
T
= 25°C
0
0
–5
–10
–15
–30
0
–5
–10
–15
–20
–25
–30
0
–5
–10
–25
–30
–20
–25
–15
P(LO) (dBm)
P(LO) (dBm)
P(LO) (dBm)
5500 G10
5500 G12
5500 G11
LNA Input Return Loss
vs Supply Voltage
LNA Output Return Loss
vs Supply Voltage
LNA Input Return Loss
vs Temperature
18
16
14
12
10
8
15
14
13
12
11
10
9
24
RF = 2.5GHz
A
RF = 2.5GHz
= 3V
RF = 2.5GHz
A
T
= 25°C
V
T
= 25°C
CC
22
20
18
16
14
12
10
8
HIGH GAIN
HIGH GAIN
HIGH GAIN
LOW GAIN
8
LOW GAIN
3.5
7
LOW GAIN
6
6
6
1.5
2.5
4.5
5.5
–50
0
50
100
3.5
1.5
2.5
4.5
5.5
TEMPERATURE (°C)
V
(V)
CC
V
(V)
CC
5500 G13
5500 G14
5500 G15
LNA Output Return Loss
vs Temperature
ICC vs Supply Voltage
(High Gain Mode)
ICC vs Supply Voltage
(Low Gain Mode)
20
18
16
14
12
10
8
31
29
27
25
23
21
19
17
15
28
26
24
22
20
18
16
14
12
RF = 2.5GHz
CC
V
= 3V
85°C
85°C
25°C
HIGH GAIN
LOW GAIN
25°C
–40°C
–40°C
6
50
TEMPERATURE (°C)
100
1.5
3.5
(V)
5.5
1.5
3.5
(V)
5.5
–50
0
2.5
4.5
2.5
4.5
V
CC
V
CC
5500 G16
5500 G17
5500 G18
5500f
5
LT5500
U
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PIN FUNCTIONS
EN(Pin1):EnablePin.Avoltagelessthan0.3V(LogicLow)
disablesthepart. Aninputgreaterthan1.35V(LogicHigh)
enablesthepart.Thispinshouldbebypassedtogroundwith
a 100pF capacitor. To shut down the part, this pin and GS
(Pin 24) must be logic low. Voltage on this pin should not
exceed VCC nor fall below ground.
The output can be taken differentially or transformed into
a single ended output, depending on user preference and
performance requirements.
MIX_IN (Pin 15): Mixer RF Input. This pin is internally
biased to 0.83V and must be AC coupled. An external
matching network is necessary to match to a 50Ω system.
LO+, LO– (Pins 18, 19): LO Input Pins. These pins are
used to provide the LO drive to the mixer. The signal can
be provided either single ended or differentially. These
pins are internally biased to VCC – 0.2V and must be AC
coupled.
VCC (Pins 2, 9, 17, 21): Power Supply Pins. See Figure 6
for recommended power supply bypassing.
LNA_IN (Pin 3): LNA Input Pin. The LT5500 has better
than 10dB input return loss from 1.8GHz to 2.7GHz. This
pin is internally biased to 0.8V and must be AC coupled.
GND (Pin 4, 11, 14, 16, 20, 23): Ground Pins. These pins
LNA_OUT (Pin 22): The Output Pin for the LNA. An
external matching network is necessary to match to a 50Ω
system. This pin must be DC coupled to the power supply.
should be connected directly to ground.
LNA_GND (Pins 5, 6, 7, 8): LNA Ground Pins. These pins
control the gain of the LNA. At higher frequencies, these
pinsmustbeconnecteddirectlytogroundtomaximizethe
gain.
GS (Pin 24): Gain Select Pin. This pin is used to select
between high gain and low gain modes. High gain mode is
selected when an input voltage greater than 1.35V (Logic
High) is applied to this pin. Low gain mode is selected
when the applied voltage is less than 0.3V (Logic Low).
This pin should be bypassed to ground with a 100pF
capacitor. To shut down the part, this pin must be logic
low. Voltage on this pin should not exceed VCC nor fall
below ground.
MIX_GND (Pin 10): Mixer Ground Pin. To optimize the
performance of the mixer, a 4.7nH inductor to ground is
required for this pin.
IF+, IF– (Pins 12, 13): Intermediate Frequency (IF) Mixer
Output Pins. These pins must be inductively tied to VCC.
5500f
6
LT5500
W
BLOCK DIAGRA
LT5500
1
EN
GS
LNA_OUT
–
24
22
BIAS
LNA_IN
3
4, 11, 14, 16, 20, 23
GND
LO 19
LNA_GND
5
6
7
8
+
LO 18
2, 9, 17, 21
V
CC
LO
MIX_GND
MIX_IN 15
10
RF
IF
+
–
IF
12
IF
13
5500 BD
Figure 2. LT5500 Block Diagram
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W U U
APPLICATIONS INFORMATION
The LT5500 consists of an LNA, a Mixer, an LO buffer and
the associated bias circuitry. The chip is designed to be
compatible with IEEE802.11b wireless local area network
(WLAN), MMDS and other wireless applications. The LNA
andMixeraredesignedtooperateoveraninputfrequency
range of 1.8GHz to 2.7GHz with a supply voltage of 1.8V
to 5.25V. The Mixer IF output frequency range is typically
10MHz to 450MHz with proper matching. The typical LO
drive is –10dBm. The LO buffer operation is broadband.
requires a shunt inductor connected to the power supply
to provide the bias current. The component configuration
for matching and example component values are listed in
Figure 3. If it is desirable to reduce the gain further and
simultaneously broaden the LNA bandwidth, an addi-
tional shunt resistor to the power supply can be added to
the output to reduce the output quality factor (Q).
The LT5500 is designed to allow an interstage bandpass
filter to be introduced between the output of the LNA and
the input of the Mixer. If such an interstage filter is
unnecessary, the output of the LNA can be connected to
the Mixer input through a blocking capacitor and small
value resistor.
LNA
The LNA has two modes of operation: high gain and low
gain. In the high gain mode, the LNA is a cascode
amplifier. Package inductance is used to achieve better
than 10dB input return loss over the entire frequency
range. The input of the LNA must be AC coupled. The
linearity of the high gain mode of the LNA can be in-
creased by adding inductance to LNA_GND. This will
reduce the gain and improve input return loss while
having little impact on the low gain mode. In low gain
mode, the LNA uses a capacitively coupled diode and a
resistively degenerated cascode to attenuate the incom-
ing signal and maintain a moderate VSWR. The LNA
output is an open collector, and the matching circuit
Mixer
The Mixer consists of a single-ended input differential pair
followedbyadouble-balancedmixercell.Theinputmatch-
ing configuration for the Mixer is shown in Figure 3. The
Mixer uses a 4.7nH external inductance to act as a high
frequency current source at the MIX_GND pin. Example
component values for matching the mixer input are tabu-
lated in Figure 3.
5500f
7
LT5500
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APPLICATIONS INFORMATION
GAIN
SELECT
ENABLE
100pF
100pF
V
CC
100pF
100pF
LT5500
EN
GS
L4
L2
LNA_IN
LNA_OUT
RF OUT
RF INPUT
GND
C4
APPLICATION DEPENDENT
COMPONENT VALUES
–
LO
LNA_GND
RF INPUT 1.8GHz
2.5GHz
2.7nH
4.7nH
1.8nH
220pF
10pF
L4
L2
4.7nH
12nH
L3
C17
+
LO
V
CC
L3
4.7nH
LO INPUT
V
CC
C4
220pF
C17
L9
10pF
5.6nH
*
2.7nH
1.5pF
C23
1.8pF
L9
LO
MIX_GND
MIX_IN
–
MIXER RF
INPUT
280MHz IF OUTPUT
15nH
RF
L7
T1
IF
C23
+
TC8-1 MINI-CIRCUITS
L5
4.7nH
IF
IF
T1
V
CC
IF OUTPUT
•
•
*REFER TO FIGURE 6 FOR POWER SUPPLY
PINS BYPASSING RECOMMENDATION
C2
100pF
L7
5500 F03
Figure 3. Simplified Test Schematic for 1.8GHz and 2.5GHz Applications
An IF transformer can be used to create a single-ended
output. The additional discrete components necessary to
achieve a 50Ω match are tabulated in Figure 3. Alterna-
tively, the discrete solution shown in Figure 4 can be used
to perform differential to single-ended conversion. For
best LO and RF signal suppression at the IF output, a
transformer should be used. If it is desirable to reduce the
gain of the mixer, a resistor between the IF outputs can be
used.
LO Buffer
The LO inputs can be driven either differentially or single
ended. A single-ended configuration is shown along with
example component values in Figure 3. Optionally, the LO
can be driven differentially as shown in Figure 5.
LT5500
12
13
+
–
IF
IF
TX1
4:1
19
18
V
–
CC
LO
LO INPUT
IF OUTPUT 280MHz
LT5500
L3
L10, L11
C12
27nH
3.3pF
2.2pF
100pF
+
LO
C14
5500 F05
L10
L11
C14
C12
LO INPUT 2.22GHz
50Ω
IF OUTPUT
L3
TX1
3.3nH
TOKO-BF4
5500 F04
Figure 4. Alternative Mixer IF Output Matching
Figure 5. Optional Transformer-Based Differential LO Drive
5500f
8
LT5500
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APPLICATIONS INFORMATION
Modes of Operation
evaluationofbothtransformerbasedanddiscretecompo-
nent based matching.
The LT5500 has three operating modes:
1. Shutdown
The evaluation board employs primarily 0402 surface
mount components, particularly near the signal paths. All
surface mount inductors must have a high self-resonance
frequency. The component values necessary for 1.8GHz
and 2.5GHz applications are tabulated in Figure 3.
2. LNA High Gain
3. LNA Low Gain
For shutdown, the EN pin and the GS pin must be at logic
Low. LogicLowisdefinedasacontrolvoltagebelow0.3V.
LNA High gain mode requires that both EN and GS pins be
at logic High. Logic High is defined as a control voltage
above 1.35V. LNA Low gain mode requires that the EN pin
be at logic High and that the GS pin be at logic Low. Mixer
operation is independent of the GS pin. The Mixer is
enabled when the EN pin is at logic High.
RF Layout Tips
• Use50Ωimpedancetransmissionlinesuptothematch-
ing networks. Use of ground planes is a must, particu-
larly beneath the IC.
• Keep the matching networks as close to the pins as
possible.
Table 1: Mode Selection
• Surface mount 0402 outline (or smaller) parts are
recommended to minimize parasitic capacitances and
inductances.
EN
GS
LNA
MIXER
On
High
High
Low
High
Low
Low
High Gain
Low Gain
Shutdown
On
• ImproveLOisolationandmaximizecomponentdensity
by putting the LO signal trace on the bottom of the
board. Thispermitseitherthematchingcomponentsor
an interstage filter to be placed directly between the
LNA output and the Mixer input.
Shutdown
Evaluation Board
Figure 6 shows the circuit schematic of the evaluation
board. Each signal terminal of the evaluation board has
provisions for three matching components in a T-forma-
tion. In practice, two or fewer components are needed to
achievethematch.InthecaseoftheLNAinput,noexternal
components are necessary if the band select filter pro-
vides the necessary AC coupling. Otherwise AC coupling
must be provided. A similar consideration applies to the
Mixer input pin. The LO terminal of the evaluation board
was designed to permit evaluation of both single ended
and differential matching configurations. The differential
configuration anticipates the use of a transformer. Simi-
larly, the IF output board layout was designed to permit
• Place bypass capacitors to ground in close proximity to
the pull-up inductors on the LNA and Mixer outputs to
improve component behavior and assure a good small-
signal ground.
• VCC lines must be decoupled with low impedance,
broadbandcapacitorstopreventinstability.Thecapaci-
tors should be placed as close as possible to the VCC
pins.
• Avoid use of long traces whenever possible. Long RF
traces in particular lead to signal radiation, degraded
isolation and higher losses.
5500f
9
LT5500
U
W U U
APPLICATIONS INFORMATION
R1
5.1k
V
CC2
E1
SW1
R2
5.1k
4
3
1
2
C24
100pF
V
CC1
C22
100pF
C1
100pF
C2
V
C25
100pF
1µF
CC1
E2
C3
100pF
1
2
24
23
22
21
20
19
18
17
16
15
14
13
EN
GS
L4
2.7nH
V
C16
CC1
LT5500
L2
8.2pF
V
GND
CC
4.7nH
R3 0Ω R4 0Ω
3
J2
J1
LNA_IN
LNA_OUT
LNA_IN
LNA_OUT
4
C6
1µF
GND
V
CC
C17
10pF
5
R6
0Ω
LNA_GND
LNA_GND
LNA_GND
LNA_GND
GND
C5 100pF
C4 220pF
6
J3
LO_IN
–
LO
7
+
C8 1µF
LO
L3
1.8nH
C9
100pF
8
V
CC
C10 100pF
9
V
GND
MIX_IN
GND
CC
10
11
12
MIX_GND
GND
L6
2.7nH
L5
4.7nH
J5
+
–
IF
IF
MIX_IN
C28
1.5pF
T1
3
2
1
4
6
R5
0Ω
C13
1nF
C15
100pF
J6
IF_OUT
•
•
L7
15nH
E4
E5
5500 F06
Figure 6. 2.5GHz Evaluation Circuit Schematic
5500f
10
LT5500
U
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APPLICATIONS INFORMATION
Figure 7. Component Side Silkscreen of Evaluation Board
Figure 8. Component Side Layout of Evaluation Board
Figure 9. RF Ground (Layer 2) Layout of Evaluation Board
Figure 10. Routing (Layer 3) Layout of Evaluation Board
Figure 11. Bottom Side Silkscreen of Evaluation Board
Figure 12. Bottom Side Layout of Evaluation Board
5500f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT5500
U
PACKAGE DESCRIPTION
GN Package
24-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.337 – .344*
(8.560 – 8.738)
.033
(0.838)
REF
24 23 22 21 20 19 18 17 16 15 14 13
.045 ±.005
.229 – .244
.150 – .157**
(5.817 – 6.198)
(3.810 – 3.988)
.254 MIN
.150 – .165
1
2
3
4
5
6
7
8
9 10 11 12
.0165 ±.0015
.0250 TYP
RECOMMENDED SOLDER PAD LAYOUT
.015 ± .004
(0.38 ± 0.10)
.053 – .068
(1.351 – 1.727)
.004 – .0098
(0.102 – 0.249)
× 45°
.007 – .0098
(0.178 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
.008 – .012
(0.203 – 0.305)
.0250
(0.635)
BSC
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
GN24 (SSOP) 0502
3. DRAWING NOT TO SCALE
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT5502
400MHz Quadrature Demodulator with RSSI
1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain,
90dB RSSI Range
LT5503
1.2GHz to 2.7GHz Direct IQ Modulator and
Upconverting Mixer
1.8V to 5.25V Supply, Four-Step RF Power Control,
120MHz Modulation Bandwidth
LT5504
800MHz to 2.7GHz RF Measuring Receiver
300MHz to 3.5GHz RF Power Detector
80dB Dynamic Range, Temperature Compensated, 2.7V to 5.5V Supply
>40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply
1.8V to 5.25V Supply, 40MHz to 500MHz IF, Linear Power Gain
48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply
SC70 Package
LTC5505
LT5506/LTC5446 500MHz Quadrature IF Demodulator with VGA
LTC5507
LTC5508
LTC5509
LT5511
LT5512
LT5515
LT5516
LT5522
100kHz to 1GHz RF Power Detector
300MHz to 7GHz RF Power Detector
300MHz to 3GHz RF Power Detector
High Signal Level Upconverting Mixer
High Signal Level Downconverting Mixer
36dB Dynamic Range, SC70 Package
RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer
DC-3GHz, 20dBm IIP3, Integrated LO Buffer
1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3,Integrated LO Quadrature Generator
0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3,Integrated LO Quadrature Generator
600MHz to 2.7GHz High Signal Level Mixer
25dBm IIP3 at 900MHz, 21.5dBm IIP3 at 1.9GHz, Single-Ended 50Ω
Matched RF and LO Ports, Integrated LO Buffer
LTC5532
300MHz to 7GHz Precision RF Power Detector
Precision VOUT Offset Control, Adjustable Gain and Offset Voltage
ThinSOT is a trademark of Linear Technology Corporation.
5500f
LT/TP 0305 1K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 2005
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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