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LTC6412IUF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC6412
1
6412fa
TYPICAL APPLICATION
DESCRIPTION
800MHz, 31dB Range
Analog-Controlled VGA
The LTC
®
6412 is a fully differential variable gain amplifi er
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 fl at 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 amplifi er
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.
3.3V Fully Differential 240MHz IF Receiver Chain with 31dB Gain Control
FEATURES
APPLICATIONS
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
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
V
CC
SHDN
EN
GND
V
CM
V
REF
DECL1
DECL2
–V
G
+V
G
+IN
10nF
0.1μF
BPF
V
CM
GND
6412 TA01
V
DD
LTC2208
0.1μF
3.3V
1nF
0.1μF
180nH180nH
3.3V
3.3V
3.3V
+OUT
–OUT
A
IN
+
A
IN
–
–OUT
+OUT
10nF
10nF
0.1μF
0.1μF
0.1μF
GAIN CONTROL
(+ SLOPE MODE)
IF INPUT
+IN
V
+
V
–
V
CM
LTC6400-8
–IN
LTC6412
–IN
2.2μF
VGA Gain vs Frequency
Over Gain Control Range
FREQUENCY (MHz)
–20
GAIN (dB)
–10
0
10
20
1 100 1000 10000
6412 G01
–30
10
G
MAX
G
MIN
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.
LTC6412
2
6412fa
Total Supply Voltage (V
CC
to GND) ...........................3.8V
Amplifi er Input Current (+IN, –IN) ........................±20mA
Amplifi er Output Current (+OUT, –OUT) ...............±70mA
Input Current (+V
G
, –V
G
, V
REF
, EN, SHDN ) .........±10mA
Input Current (V
CM
, DECL1, DECL2) ....................±10mA
RF Input Power, Continuous, 50Ω ......................+15dBm
RF Input Power, 100μs pulse, 50Ω ....................+20dBm
Operating Temperature Range (Note 2).... –40°C to 85°C
Specifi ed Temperature Range (Note 3) .... –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Junction Temperature ........................................... 150°C
(Note 1)
24 23 22 21 20 19
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18GND
+IN
–IN
V
CM
V
CM
V
CC
GND
+OUT
–OUT
GND
DECL2
V
CC
V
CC
GND
SHDN
EN
GND
V
CC
DECL1
GND
+V
G
V
REF
–V
G
GND
25
T
JMAX
= 150°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6412CUF#PBF LTC6412CUF#TRPBF 6412
24-Lead (4mm × 4mm) Plastic QFN
0°C to 70°C
LTC6412IUF#PBF LTC6412IUF#TRPBF 6412
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
LTC6412
3
6412fa
DC ELECTRICAL CHARACTERISTICS
The l denotes specifi cations that apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. DC electrical performance measured using DC test circuit schematic.
V
IN(DIFF)
is defi ned as (+IN) – (–IN). V
OUT(DIFF)
is defi ned as (+OUT) – (–OUT). V
IN(CM)
is defi ned as [(+IN) + (–IN)]/2. V
OUT(CM)
is
defi ned as [(+OUT) + (–OUT)]/2. Unless noted otherwise, default operating conditions are V
CC
= 3.3V, EN = 0.8V, SHDN = 2.2V, +V
G
tied
to V
REF
(negative gain slope mode), V
OUT(CM)
= 3.3V. Differential power gain defi ned at Z
SOURCE
= 50Ω differential and Z
LOAD
= 200Ω
differential.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Gain Characteristics
G
MAX
Maximum Differential Power Gain (Note 4) –V
G
= 0V, V
IN(DIFF)
= 100mV
l
16.1
15.5
17.1 18.1
18.7
dB
dB
G
MIN
Minimum Differential Power Gain (Note 4) –V
G
= 1.2V, V
IN(DIFF)
= 200mV
l
–16.2
–16.8
–14.9 –13.6
–13.0
dB
dB
G
RANGE
Differential Power Gain Range G
MAX
-G
MIN
l
30.7
30.1
31.9 33.1
33.7
dB
dB
TC
GAIN
Temperature Coeffi cient of Gain at Fixed V
G
–V
G
= 0V to 1.2V –0.007 dB/°C
G
SLOPE
Gain Control Slope –V
G
= 0.2V to 1.0V, 85 Points, Slope of the
Least-Square Fit Line
l
–34.1
–34.7
–32.9 –31.7
–31.1
dB/V
dB/V
G
CONF(AVE)
Average Conformance Error to Gain Slope Line –V
G
= 0.2V to 1.0V, 85 Points, Standard
Error to the Least-Square Fit Line
0.12 0.20 dB
G
CONF(MAX)
Maximum Conformance Error to Gain Slope
Line
–V
G
= 0.2V to 1.0V, 85 points, Maximum
Error to the Least-Square Fit Line
0.20 0.45 dB
+IN and –IN Pins
R
IN(GMAX)
Differential Input Resistance at Maximum Gain –V
G
= 0V, V
IN(DIFF)
= 100mV
l
49
47
57 65
67
Ω
Ω
R
IN(GMIN)
Differential Input Resistance at Minimum Gain –V
G
= 1.2V, V
IN(DIFF)
= 200mV
l
49
47
57 65
67
Ω
Ω
V
INCM(GMAX)
Input Common Mode Voltage at Maximum Gain –V
G
= 0V, DC Blocking Capacitor to Input 640 mV
V
INCM(GMIN)
Input Common Mode Voltage at Minimum Gain –V
G
= 1.2V, DC Blocking Capacitor to Input 640 mV
+V
G
, –V
G
, and V
REF
Pins
R
IH(+VG)
+V
G
Input High Resistance +V
G
= 1.0V, –V
G
Tied to V
REF
,
R
IN(+VG)
= 1V/Δ I
IL(+VG)
l
7.8
7.2
9.2 10.6
11.6
kΩ
kΩ
R
IH(–VG)
–V
G
Input High Resistance –V
G
= 1.0V, +V
G
Tied to V
REF
,
R
IN(–VG)
= 1V/Δ I
IL(–VG)
l
7.8
7.2
9.2 10.6
11.6
kΩ
kΩ
I
IL(+VG)
+V
G
Input Low Current +V
G
= 0V, –V
G
Tied to V
REF
l
–9
–10
–5 –1
–1
μA
μA
I
IL(–VG)
–V
G
Input Low Current –V
G
= 0V, +V
G
Tied to V
REF
l
–9
–10
–5 –1
–1
μA
μA
V
REF
Internal Bias Voltage –V
G
= 0V, +V
G
Tied to V
REF
l
590
580
615 640
650
mV
mV
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LTC6412IUF#TRPBF

Mfr. #:
Buy LTC6412IUF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 800MHz, 31dB Rng Analog-Controlled VGA
Lifecycle:
New from this manufacturer.
Delivery:
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