Pinout
Specifications| Gain Adjust Range | 31 dB |
| Signal Channel BW | 600 MHz |
| Supply Min | 4 Volt |
| Supply Max | 5 Volt |
| Gain Control Interface | Parallel TTL/CMOS |
| Supply Current | 100 mA |
| PowerWise Rating 2 | 167 uA/MHz |
| Output Current | 20 mA |
| Offset Voltage max, 25C | 30 mV |
| Voltage Noise | 1.8 nV/root(Hz) |
| HD 2nd | -80 dB |
| HD 3rd | -60 dB |
| Special Features | 1db Steps, Differential I/O |
| Function | VGA |
| Temperature Min | -40 deg C |
| Temperature Max | 85 deg C |
| PowerWise | Yes |
| View Using Catalog |
DescriptionThe LMH6515 is a high performance, digitally controlled variable gain amplifier (DVGA). It combines precision gain control with a low noise, ultra-linear, differential amplifier. Typically, the LMH6515 drives a high performance ADC in a broad range of mixed signal and digital communication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range. When used in conjunction with a high speed ADC, system dynamic range can be extended by up to 32 dB.
The LMH6515 has a differential input and output allowing large signal swings on a single 5V supply. It is designed to accept signals from RF elements and maintain a terminated impedance environment. The input impedance is 200Ω resistive. The output impedance is either 200Ω or 400Ω and is user selectable. A unique internal architecture allows use with both single ended and differential input signals.
Input signals to the LMH6515 are scaled by a highly linear, digitally controlled attenuator with 31 accurate 1 dB steps. The attenuator output provides the input signal for a high gain, ultra linear differential transconductor. The transconductor differential output current can be converted into a voltage by using the on-chip 200Ω or 400Ω loads. The transconductance gain is 0.1 Amp/Volt resulting in a maximum voltage gain of +26 dB when driving a 200Ω load, or 32 dB when driving the 400Ω load. On chip digital latches are provided for local storage of the gain setting. The gain step settling time is 5 ns and care has been taken to reduce the sensitivity of bandwidth and phase to gain setting.
The LMH6515 operates over the industrial temperature range of −40°C to +85°C. The LMH6515 is available in a 16-Pin, thermally enhanced, LLP package.
Reference Designs
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RD-146 - High IF Receiver Reference Design |
Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-1718: Application Note 1718 Differential Amplifier Applications Up to 400 MHz |
154 Kbytes |
14-Nov-07 |
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AN-1718 (Japanese): Application Note 1718 Differential Amplifier Applications Up to 400 MHz
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
120 Kbytes |
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AN-1718 (Chinese): Application Note 1718 Differential Amplifier Applications Up to 400 MHz
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280 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1580: Application Note 1580 LMH6515EL Digital Controlled, Variable Gain Amplifier Evaluation Board |
2238 Kbytes |
31-Oct-07 |
Download |
AN-1580 (Japanese): Application Note 1580 LMH6515EL Digital Controlled, Variable Gain Amplifier Evaluation Board
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
997 Kbytes |
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| AN-1828: Application Note 1828 LMH6514 Digital Controlled Variable Gain Amplifier Evaluation Board |
2238 Kbytes |
8-Apr-08 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
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More Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-1906: Application Note 1906 LMH6518 Evaluation Board |
965 Kbytes |
23-Oct-08 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
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LMH6515 Data Sheet
