參數(shù)資料
型號(hào)： LT5514
廠商： Linear Technology Corporation
元件分類： ADC
英文描述： Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain
中文描述： 超低失真IF放大器/ ADC的數(shù)字控制增益驅(qū)動(dòng)
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 275K
代理商： LT5514
1
LT5514
5514f
Ultralow Distortion IF
Amplifier/ADC Driver with
Digitally Controlled Gain
DESCRIPTIOU
The LT
5514 is a programmable gain amplifier (PGA) with
bandwidth extending from low frequency (LF) to 850MHz.
It consists of a digitally controlled variable attenuator,
followed by a high linearity amplifier. The amplifier is
configured with two identical transconductance amplifi-
ers, hard wired in parallel with individual dedicated enable
pins. When both amplifiers are enabled (Standard mode),
the LT5514 offers an OIP3 of +47dBm (at 100MHz).
Power dissipation can be reduced when a single amplifier
is enabled (Low Power mode). Four parallel digital inputs
control the gain over a 22.5dB range with 1.5dB step
resolution. An on-chip power supply regulator/filter helps
isolate the amplifier signal path from external noise sources.
The LT5514’s open-loop architecture offers stable opera-
tion for any practical load conditions, including peaking-
free AC response when driving capacitive loads, and
excellent reverse isolation.
The LT5514 may be operated broadband, where the out-
put differential RC time constant sets the bandwidth, or it
may be used as a narrowband driver with the appropriate
output filter.
I
Output IP3 at 100MHz: 47dBm
I
Maximum Output Power: 21dBm
I
Bandwidth: LF to 850MHz
I
Propagation Delay: 0.8ns
I
Maximum Gain: 33dB
I
Noise Figure: 7.3dB (Max Gain)
I
Gain Control Range: 22.5dB
I
Gain Control Step: 1.5dB
I
Gain Control Settling Time: 500ns
I
Output Noise Floor: –134dBm/Hz (Max Gain)
I
Reverse Isolation: –80dB
I
Single Supply: 4.75V to 5.25V
I
Low Power Mode
I
Shutdown Mode
I
Enable/Disable Time: 1
μ
s
I
Differential I/O Interface
I
20-Lead TSSOP Package
APPLICATIU
I
High Linearity ADC Driver
I
IF Sampling Receivers
I
VGA IF Power Amplifier
I
50
Driver
I
Instrumentation Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
TYPICAL APPLICATIO
U
FREQUENCY (MHz)
0
47
50
56
150
5514 TA02
44
41
50
100
200
38
35
53
O
R
OUT
= 200
R
OUT
= 100
LT5514
ADC
0.1
μ
F
0.1
μ
F
100
5V
CHOKE
GAIN CONTROL
CHOKE
0.1
μ
F
5514 TA01
0.1
μ
F
IF
AMP
IF
BPF
LO
RF
INPUT
4 LINES
Output IP3 vs Frequency
(Standard Mode)
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