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PDF LTC6412 Data sheet ( Hoja de datos )
| Número de pieza | LTC6412 | |
| Descripción | 31dB Range Analog-Controlled VGA | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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FEATURES
n 800MHz –3dB Small-Signal Bandwidth
n Continuously-Adjustable Gain Control
n –14dB to +17dB Linear-in-dB Gain Range
n 35dBm OIP3 at 240MHz Across All Gain Settings
n 10dB Noise Figure at Maximum Gain
n (IIP3 – NF) = +8dBm at 240MHz Across All Gains
n 2.7nV/√Hz Input Referred Noise
n Differential Inputs and Outputs
n 50Ω Input Impedance Across all Gains
n Single Supply Operation from 3V to 3.6V
n 110mA Supply Current
n 4mm × 4mm × 0.75mm 24-Pin QFN Package
APPLICATIONS
n IF Signal Chain Automatic Gain Control (AGC)
n 2.5G and 3G Cellular Basestation Transceivers
n WiMAX, WiBro, WLAN Receivers
n Satellite and GPS Receiver IF
LTC6412
800MHz, 31dB Range
Analog-Controlled VGA
DESCRIPTION
The LTC®6412 is a fully differential variable gain amplifier
with linear-in-dB analog gain control. It is designed for
AC-coupled operation in IF receiver chains from 1MHz
to 500MHz. The part has a constant OIP3 across a wide
output amplitude range and across the 31dB gain control
range. The output noise (NF + Gain) is also flat versus gain
to provide a uniform spurious-free dynamic range (SFDR)
>120dB over the full gain control range at 240MHz.
The LTC6412 is ideal for interfacing with the LT®5527 and
LT5557 downconverting mixers, LTC6410-6 IF amplifier
and the LTC6400/LTC6401/LTC6416 ADC drivers for use
in 12-, 14-, and 16-bit ADC applications.
The LTC6412 recovers quickly from an overdrive condition,
and the EN pin allows for a fast output signal disable to
protect sensitive downstream components. Asserting the
SHDN pin reduces the current consumption below 1mA
for power-down or sleep modes.
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.
TYPICAL APPLICATION
3.3V Fully Differential 240MHz IF Receiver Chain with 31dB Gain Control
3.3V
1nF
10nF
+IN
IF INPUT
LTC6412
–IN
10nF
3.3V
0.1μF
180nH
180nH 3.3V
+OUT
0.1μF
–OUT
0.1μF
GAIN CONTROL
(+ SLOPE MODE)
+IN V+ +OUT
LTC6400-8
VCM
–IN V– –OUT
BPF
3.3V
AIN+
VDD
LTC2208
AIN–
VCM GND
6412 TA01
2.2μF
10nF
0.1μF
0.1μF
0.1μF
VGA Gain vs Frequency
Over Gain Control Range
20
GMAX
10
0
–10
GMIN
–20
–30
1
10 100 1000
FREQUENCY (MHz)
10000
6412 G01
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LTC6412
AC ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Typical AC electrical performance measured in demo board DC1464A
(Figure 3, Test Circuit A) unless otherwise noted. Default operating conditions are VCC = 3.3V, EN = 0.8V, SHDN = 2.2V, +VG tied to VREF
(negative gain slope mode), and ZSOURCE = ZLOAD = 50Ω unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
Small Signal
BWGMAX
BWGMIN
Sdd11
–3dB Bandwidth for Sdd21 at Maximum Gain
–3dB Bandwidth for Sdd21 at Minimum Gain
Input Match at ZSOURCE = 50Ω Differential
–VG = 0V, Test Circuit B
–VG = 1.2V, Test Circuit B
–VG = 0V to 1.2V, 10MHz-500MHz,
Test Circuit B
Sdd22
Output Match at ZLOAD = 200Ω Differential –VG = 0V to 1.2V, 10MHz-250MHz,
Test Circuit B
Sdd12
Reverse Isolation
–VG = 0V to 1.2V, 10MHz-500MHz,
Test Circuit B
Transient Response
tSTEP(6dB) 6dB Gain Step Response Time
tSTEP(12dB) 12dB Gain Step Response Time
tSTEP(20dB) 20dB Gain Step Response Time
tOVDR
Overdrive Recovery Time at 70MHz
tOFF Output Amplifier Disable Time
tON Output Amplifier Enable Time
70MHz Signal
Peak POUT = +4dBm, –VG = 0.2V to 0.4V,
Time to Settle Within 1dB of Final POUT
Peak POUT = +4dBm, –VG = 0.2V to 0.6V,
Time to Settle Within 1dB of Final POUT
Peak POUT = +4dBm, –VG = 0.2V to 0.8V,
Time to Settle Within 1dB of Final POUT
–VG = 0V, PIN = +3dBm to –17dBm, Time to
Settle Within 1dB of Final POUT
POUT = 0dBm at EN = 0V, –VG = 0V,
EN = 0V to 3V, Time for POUT ≤ –20dBm
POUT = 0dBm at EN = 0V, –VG = 0V, EN = 3V to
0V, Time for POUT ≥ –1dBm
GMAX
GMIN
GRANGE
HD2
HD3
IM3
Maximum Gain
Minimum Gain
Gain Range
Second Harmonic Distortion
Third Harmonic Distortion
Third-Order Intermodulation
OIP3 Output Third-Order Intercept
P1dBGMAX Output 1dB Compression Point at Max Gain
NFGMAX Noise Figure at Maximum Gain
NFGMIN Noise Figure at Minimum Gain
140MHz Signal
–VG = 0V, Test Circuit B
–VG = 1.2V, Test Circuit B
GMAX-GMIN
POUT = 0dBm, –VG = 0V to 1.0V
POUT = 0dBm, –VG = 0V to 1.0V
f1 = 69.5MHz, f2 = 70.5MHz,
POUT = –6dBm/Tone, –VG = 0V to 1.0V
f1 = 69.5MHz, f2 = 70.5MHz,
POUT = –6dBm/Tone, –VG = 0V to 1.0V
–VG = 0V (Note 6)
–VG = 0V (Note 5)
–VG = 1.2V (Note 5)
GMAX
GMIN
GRANGE
HD2
HD3
Maximum Gain
Minimum Gain
Gain Range
Second Harmonic Distortion
Third Harmonic Distortion
–VG = 0V, Test Circuit B
–VG = 1.2V, Test Circuit B
GMAX-GMIN
POUT = 0dBm, –VG = 0V to 1.0V
POUT = 0dBm, –VG = 0V to 1.0V
MIN TYP MAX UNITS
800 MHz
800 MHz
–20 dB
–10 dB
-80 dB
0.4 μs
0.4 μs
0.4 μs
25 ns
25 ns
20 ns
17 dB
–15 dB
32 dB
–80 dBc
–80 dBc
–90 dBc
39 dBm
13 dBm
10 dB
42 dB
17 dB
–15 dB
32 dB
–80 dBc
–75 dBc
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LTC6412
TYPICAL PERFORMANCE CHARACTERISTICS
Electrical Performance in Test Circuits A and B at TA = 25°C and VCC = 3.3V unless otherwise noted.
6dB Gain Control Step
70MHz Time Domain Response
10dB Gain Control Step
70MHz Time Domain Response
20dB Gain Control Step
70MHz Time Domain Response
RFOUT
50Ω
–VG (0.25V/DIV)
PEAK
RFOUT = 4dBm
012345
TIME (μs)
6412 G28
SHDN Step at GMAX with EN = 0V
70MHz Time Domain Response
SHDN (1V/DIV)
RFOUT
50Ω
PEAK RFOUT = 4dBm
0 100 200 300 400 500
TIME (μs)
6412 G31
RFOUT
50Ω
–VG (0.5V/DIV)
PEAK
RFOUT = 4dBm
012345
TIME (μs)
6412 G29
–VG (0.5V/DIV)
RFOUT
50Ω
PEAK
RFOUT = 4dBm
012345
TIME (μs)
6412 G30
SHDN Step at G = 3dB with EN = 0V
70MHz Time Domain Response
SHDN (1V/DIV)
Overdrive Compression at GMAX
70MHz Time Domain Response
PEAK GAIN
COMPRESSION
RFOUT 50Ω
20dB
RFOUT
50Ω
PEAK RFOUT = 4dBm
0 100 200 300 400 500
TIME (μs)
6412 G32
10dB
0dB
0
PEAK RFOUT = 14dBm
20 40 60 80 100
TIME (μs)
6412 G33
Overdrive Recovery at GMAX
70MHz Time Domain Response
1.2
1.0
0.8
EXTERNAL
RF SWITCH PULSE
0.6
0.4
0.2
RFOUT INTO 50Ω,
10dB ATTENUATED
0
SMALL SIGNAL
–0.2
–0.4 PEAK
15dB COMPRESSED
RFOUT = 14dBm
–0.6
0 50 100 150 200 250 300 350 400
TIME (ns)
6412 G34
Output EN Step at GMAX
140MHz Time Domain Response
2.5
2.0
EN
1.5
1.0
0.5 RFOUT
50Ω
0
–0.5
–1.0
–1.5
0
PEAK RFOUT = 10dBm
20 40 60 80 100 120 140 160 180 200
TIME (ns)
6412 G35
SHDN Supply Current
Time Domain Response
3.0
2.0
120 1.0
100
80 0
60
40
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
TIME (ms)
6412 G36
6412f
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC6412.PDF ] | |
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