|
|
PDF LT5554 Data sheet ( Hoja de datos )
| Número de pieza | LT5554 | |
| Descripción | Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LT5554 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
FEATURES
n 1GHz Bandwidth at all Gains
n 48dBm OIP3 at 200MHz, 2VP-P into 50Ω,
ROUT = 100Ω
n –88dBc IMD3 at 200MHz, 2VP-P into 50Ω,
ROUT = 100Ω
n 1.4nV/√Hz Input-Referred-Noise (RTI)
n 20dBm Output P1dB at 70MHz, ROUT = 130Ω
n 2dB to 18dB Gain Range (ROUT = 50Ω)
n 0.125dB Gain Step Size
n 30ps Group Delay Variation
n 5ns Fast Gain Settling Time
n 5ns Fast Overdrive Recovery
n –80dB Reverse Isolation
APPLICATIONS
n Differential ADC Driver
n IF Sampling Receivers
n VGA IF Power Amplifier
n 50Ω Driver
n Instrumentation
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LT5554
Broadband Ultra Low
Distortion 7-Bit Digitally
Controlled VGA
DESCRIPTION
The LT®5554 is a 7-bit digitally controlled programmable
gain (PG) amplifier with 16dB gain control range. It
consists of a 50Ω input variable attenuator, followed by
a high linearity variable transconductance amplifier. The
coarse 4dB input attenuator step is implemented via 2-bits
of digital control (PG5, PG6). The fine transconductance
amplifier 0.125dB step within 3.875dB gain control range
is set via 5-bits digital control (PG0 to PG4). The LT5554
gain control inputs (PGx) and the STROBE input can be
directly coupled to TTL or ECL drivers. The seven parallel
gain control inputs time skew can be eliminated by using
the STROBE input positive transition.
The internal output resistor RO = 400Ω limits the maxi-
mum overall gain to 36dB for open outputs. The internal
circuitry of open output collectors enables the LT5554 to
be unconditionally stable over any loading conditions (in-
cluding external SAW filters) and provides –80dB reverse
isolation at 300MHz.
The LT5554 is internally protected during overdrive and
has an on-chip power supply regulator.
With 0.125dB step resolution and 5ns settling time, the
LT5554 is suitable in applications where continuous gain
control is required.
TYPICAL APPLICATION
RF
INPUT
LO
5V
VCC MODE
0.1μF
IF IF
BPF AMPLIFIER
0.1μF
CDEC
0.1μF
IN+ –
DEC LT5554
BPF
+
IN–
7 BITS
PGx GAIN CONTROL
STROBE
OIP3 and SFDR vs Frequency
132
ROUT = 50Ω
49
ADC
5554 TA01
130
128
OIP3
SFDR
46
43
126
0
50 100 150
FREQUENCY (MHz)
40
200
5554 TA01b
5554f
1
1 page  
AC ELECTRICAL CHARACTERISTICS (Timing Diagram)
Timing Diagram
PG0, 1, 2, 3, 4, 5, 6
INPUTS
LT5554
STROBE
INPUTS
TSU
DATA
TRANSPARENT
THOLD
DATA
LATCH
TPW
TLATENCY
OUT SIGNAL
STATE (i)
STATE (i + 1)
TGLITCH
STATE (i + 2)
5554 TD01
DC ELECTRICAL CHARACTERISTICS Specifications are at TA = 25°C. VCC = 5V, VCCO = 5V, ENB = 3V,
MODE = 5V, unless otherwise noted. (Note 3) (Test circuit shown in Figure 16), unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Normal Operating Conditions
VCC Supply Voltage
VCCO OUT+, OUT– Output Pin DC Common Mode (Note 4)
Voltage
4.75 5 5.25
56
Shutdown DC Characteristics, ENB = 0.6V
VIN(BIAS)
DEC, IN+, IN– Bias Voltage
IIL(PG)
PGx, STR Input Current
IIH(PG)
IOUT
PGx, STR Input Current
OUT+, OUT– Current
ICC VCC Supply Current
Enable Input DC Characteristics
VIN = 0.6V
VIN = 5V
2 2.15
0
210
20
4 5.1
VIL(EN)
VIH(EN)
IIL(EN)
IIH(EN)
IIH(EN)
ENB Input LOW Voltage
ENB Input HIGH Voltage
ENB Input Current
ENB Input Current
ENB Input Current
Disable
Enable
VIN = 0.6V
VIN = 3V
VIN = 5V
0.6
3 VCC
20
70
220 300
UNIT
V
V
V
μA
μA
μA
mA
V
V
μA
μA
μA
5554f
5
5 Page 
LT5554
TYPICAL PERFORMANCE CHARACTERISTICS (ROUT = 50Ω) TA = 25°C. VCC = 5V, VCCO = 5V,
ENB = 3V, MODE = 5V, STROBE = 3V, VIH = 2.2V, VIL = 0.6V (Test circuit shown in Figure 16) POUT = 4dBm/tone (2VP-P into 50Ω),
Δf = 200kHz, unless otherwise noted.
HD3 vs Frequency for GMAX and
GMIN, POUT = 10dBm, Figure 17
–50
HD5 vs Frequency for GMAX and
GMIN, POUT = 10dBm, Figure 17
–70
–56
GMAX
–62
GMIN
–68
–76 GMAX
–82
GMIN
–88
–74 –94
–80
50
100 150
FREQUENCY (MHz)
200
5554 G31
–100
50
100 150
FREQUENCY (MHz)
200
5554 G32
(ROUT = 50Ω) TA = 25°C. VCC = 5V, VCCO = 5V, ENB = 3V, MODE = 5V, STROBE = 3V, VIH = 2.2V, VIL = 0.6V (Test circuit shown in Figure 16),
maximum gain, unless otherwise noted.
HD3 and HD5 vs POUT
for GMAX, Figure 17
–40
70MHz
–45 140MHz
–50
–55 HD3 HD3
–60 HD5
–65
–70
HD5
–75
–80
7
10 13
OUTPUT POWER (dBm)
16
5554 G33
Noise Figure vs Attenuation,
140MHz
25
Noise Figure vs Frequency
20
Single-Ended Output NF vs
Frequency, Figure 18
20
15
GMAX –3.875
10 GMAX
15 GMAX –3.875
GMAX
10
55
0
0 200 400 600
FREQUENCY (MHz)
Input Referred Noise vs
Attenuation, 140MHz
6
800
5554 G34
0
0 200 400 600
FREQUENCY (MHz)
Output Noise Density vs
Attenuation, 140MHz
12
800
5554 G35
20
4
15
10
2
5
9
6
3
0
0 –4 –8 –12 –16
ATTENUATION (dB)
5554 G36
0
0 –4 –8 –12 –16
ATTENUATION (dB)
5554 G37
0
0 –4 –8 –12 –16
ATTENUATION (dB)
5554 G38
5554f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT5554.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LT5554 | Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA | Linear |
| LT5557 | 400MHz to 3.8GHz 3.3V Active Downconverting Mixer |  Linear Technology |
| LT5558 | 600MHz to 1100MHz High Linearity Direct Quadrature Modulator | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |