Datasheet LT5514 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTIO. Output IP3 at 100MHz: 47dBm. Maximum Output Power: … |
| File Format / Size | PDF / 287 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Output IP3 at 100MHz: 47dBm. Maximum Output Power: 21dBm. Bandwidth: LF to 850MHz. Propagation Delay: 0.8ns
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LT5514 Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain
U FEATURES DESCRIPTIO
■
Output IP3 at 100MHz: 47dBm
The LT®5514 is a programmable gain amplifier (PGA) with ■
Maximum Output Power: 21dBm
bandwidth extending from low frequency (LF) to 850MHz. ■
Bandwidth: LF to 850MHz
It consists of a digitally controlled variable attenuator, ■
Propagation Delay: 0.8ns
followed by a high linearity amplifier. The amplifier is ■
Maximum Gain: 33dB
configured with two identical transconductance amplifi- ■
Noise Figure: 7.3dB (Max Gain)
ers, hard wired in parallel with individual dedicated enable ■
Gain Control Range: 22.5dB
pins. When both amplifiers are enabled (Standard mode), ■
Gain Control Step: 1.5dB
the LT5514 offers an OIP3 of +47dBm (at 100MHz). ■ Gain Control Settling Time: 500ns Power dissipation can be reduced when a single amplifier ■ Output Noise Floor: –134dBm/Hz (Max Gain) is enabled (Low Power mode). Four parallel digital inputs ■ Reverse Isolation: –80dB control the gain over a 22.5dB range with 1.5dB step ■ Single Supply: 4.75V to 5.25V resolution. An on-chip power supply regulator/filter helps ■ Low Power Mode isolate the amplifier signal path from external noise sources. ■ Shutdown Mode The LT5514’s open-loop architecture offers stable opera- ■ Enable/Disable Time: 1µs tion for any practical load conditions, including peaking- ■ Differential I/O Interface free AC response when driving capacitive loads, and ■ 20-Lead TSSOP Package
U
excellent reverse isolation.
APPLICATIO S
The LT5514 may be operated broadband, where the out- put differential RC time constant sets the bandwidth, or it ■ High Linearity ADC Driver may be used as a narrowband driver with the appropriate ■ IF Sampling Receivers output filter. ■ VGA IF Power Amplifier , LTC and LT are registered trademarks of Linear Technology Corporation. ■ 50Ω Driver ■ Instrumentation Applications
U TYPICAL APPLICATIO Output IP3 vs Frequency (Standard Mode)
56 5V 53 CHOKE CHOKE 0.1µF 0.1µF 50 ROUT = 200Ω 47 RF IF IF LT5514 100Ω ADC INPUT BPF AMP ROUT = 100Ω 44 OIP3 (dBm) 5514 TA01 LO 0.1µF 0.1µF 41 GAIN CONTROL 4 LINES 38 35 0 50 100 150 200 FREQUENCY (MHz) 5514 TA02 5514f 1
U FEATURES DESCRIPTIO
■
Output IP3 at 100MHz: 47dBm
The LT®5514 is a programmable gain amplifier (PGA) with ■
Maximum Output Power: 21dBm
bandwidth extending from low frequency (LF) to 850MHz. ■
Bandwidth: LF to 850MHz
It consists of a digitally controlled variable attenuator, ■
Propagation Delay: 0.8ns
followed by a high linearity amplifier. The amplifier is ■
Maximum Gain: 33dB
configured with two identical transconductance amplifi- ■
Noise Figure: 7.3dB (Max Gain)
ers, hard wired in parallel with individual dedicated enable ■
Gain Control Range: 22.5dB
pins. When both amplifiers are enabled (Standard mode), ■
Gain Control Step: 1.5dB
the LT5514 offers an OIP3 of +47dBm (at 100MHz). ■ Gain Control Settling Time: 500ns Power dissipation can be reduced when a single amplifier ■ Output Noise Floor: –134dBm/Hz (Max Gain) is enabled (Low Power mode). Four parallel digital inputs ■ Reverse Isolation: –80dB control the gain over a 22.5dB range with 1.5dB step ■ Single Supply: 4.75V to 5.25V resolution. An on-chip power supply regulator/filter helps ■ Low Power Mode isolate the amplifier signal path from external noise sources. ■ Shutdown Mode The LT5514’s open-loop architecture offers stable opera- ■ Enable/Disable Time: 1µs tion for any practical load conditions, including peaking- ■ Differential I/O Interface free AC response when driving capacitive loads, and ■ 20-Lead TSSOP Package
U
excellent reverse isolation.
APPLICATIO S
The LT5514 may be operated broadband, where the out- put differential RC time constant sets the bandwidth, or it ■ High Linearity ADC Driver may be used as a narrowband driver with the appropriate ■ IF Sampling Receivers output filter. ■ VGA IF Power Amplifier , LTC and LT are registered trademarks of Linear Technology Corporation. ■ 50Ω Driver ■ Instrumentation Applications
U TYPICAL APPLICATIO Output IP3 vs Frequency (Standard Mode)
56 5V 53 CHOKE CHOKE 0.1µF 0.1µF 50 ROUT = 200Ω 47 RF IF IF LT5514 100Ω ADC INPUT BPF AMP ROUT = 100Ω 44 OIP3 (dBm) 5514 TA01 LO 0.1µF 0.1µF 41 GAIN CONTROL 4 LINES 38 35 0 50 100 150 200 FREQUENCY (MHz) 5514 TA02 5514f 1
