Features • Adjustable gain with a 31 dB range • Precise 1 dB gain steps • Parallel 5-bit gain control • On chip register stores gain setting • Fully differential signal path • Single ended to differential capable • 200Ω input impedance • Small footprint (4 mm x 4 mm) LLP package Description The 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. Key Specification • 600 MHz bandwidth @ 100Ω load • 40 dBm OIP3 @ 75 MHz, 200Ω load • 20 dB to 30 dB maximum gain • Selectable output impedance of 200Ω or 400Ω • 8.3 dB noise figure • 5 ns gain step switching time • 100 mA supply current Applications • Cellular base stations • IF sampling receivers • Instrumentation • Modems • Imaging • Differential line receiver

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Datasheet

Title		Size	Date	Other Language
	LMH6515 600 MHz, Digital Controlled, Variable Gain Amplifier	532 Kbytes	12-Oct-07	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1718: Application Note 1718 Differential Amplifier Applications Up to 400 MHz	154 Kbytes	14-Nov-07	日本語 中文
	AN-1580: Application Note 1580 LMH6515EL Digital Controlled, Variable Gain Amplifier Evaluation Board	2238 Kbytes	31-Oct-07	日本語
	AN-1828: Application Note 1828 LMH6514 Digital Controlled Variable Gain Amplifier Evaluation Board	2238 Kbytes	8-Apr-08

More Application Notes

Title		Size	Date	Other Language
	AN-1906: Application Note 1906 LMH6518 Evaluation Board	965 Kbytes	23-Oct-08
	AN-1942: Application Note 1942 LMH6517 Evaluation Board	3261 Kbytes	28-Oct-09

Design Tools

Reference Design

RD-146 - High IF Receiver Reference Design

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH6515SQ	BICMOS8B+	0	1152	0	0	743900	5	211083656
LMH6515SQX	BICMOS8B+	0	1152	0	0	743900	5	211083656

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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