參數資料
| 型號： | LT5554IUH#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/32頁 |
| 文件大小： | 0K |
| 描述： | IC VGA DIG CONTROL 32-QFN |
| 標準包裝： | 2,500 |
| 應用： | 可變增益（VGA） |
| 電路數： | 1 |
| -3db帶寬： | 1GHz |
| 電流 - 電源： | 200mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 帶卷 (TR) |
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LT5554
1
5554f
FREQUENCY (MHz)
0
SFDR
(dBm/Hz)
132
130
128
126
OIP3
(dBm)
49
46
43
40
50
100
150
5554 TA01b
200
SFDR
OIP3
ROUT = 50Ω
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Broadband Ultra Low
Distortion 7-Bit Digitally
Controlled VGA
The LT5554 is a 7-bit digitally controlled programmable
gain (PG) amplier with 16dB gain control range. It
consists of a 50Ω input variable attenuator, followed by
a high linearity variable transconductance amplier. The
coarse 4dB input attenuator step is implemented via 2-bits
of digital control (PG5, PG6). The ne transconductance
amplier 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 lters) 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.
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
n Differential ADC Driver
n IF Sampling Receivers
n VGA IF Power Amplier
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.
RF
INPUT
LO
0.1μF
CDEC
0.1μF
IF
BPF
ADC
IF
AMPLIFIER
LT5554
DEC
IN+
VCC
MODE
STROBE
5554 TA01
PGx GAIN CONTROL
5V
IN–
+
–
7 BITS
OIP3 and SFDR vs Frequency
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