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

Typical Application

Typical Application click for larger image Typical Application	Block Diagram click for larger image
Typical Performance click for larger image

Parameters Values 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

Datasheets

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

Application Notes

Title		Size	Date	Other Language
	AN-1580: Application Note 1580 LMH6515EL Digital Controlled, Variable Gain Amplifier Evaluation Board	2238 Kbytes	31-Oct-07	日本語
	AN-1718: Application Note 1718 Differential Amplifier Applications Up to 400 MHz	154 Kbytes	14-Nov-07	日本語 中文
	AN-2188: Application Note 2188 Between the Amplifier and the ADC: Managing Filter Loss in Communications Systems	174 Kbytes	26-Oct-11

Other Technical Documents

Title		Type	Date
	Use In-the-loop Gain Control to Extend Dynamic Range	External Article	2007-09-24
	Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths	Signal Path Designer	2007-09-13

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6515SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 CEAC Asia Pacific 134000 DIGI-KEY Worldwide 0 RS COMPONENTS Worldwide 497 TAYLOR Americas 1000	$4.25 each at 1K+ pcs	reel of 1000
LMH6515SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$4.25 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6515.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6515 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6515EVAL	LMH6515 Digital Controlled Variable Gain Amplifier Evaluation Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2	$120.00 each	1
Thank you for your interest in the LMH6515. The LMH7322 is a 600 MHz, Digital Controlled, Variable Gain Amplifier from the PowerWise® Family Contents: 1 Fully Assembled Evaluation Board for the LMH6515 1 Datasheet for the LMH6515 1 Evaluation Board Manual (app note AN-1580)

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMH6515SQ/NOPB	39.462	LLP	16	3	260	Detail	Download	N/A	NS UZXYTT L6515SQ
LMH6515SQX/NOPB	39.461	LLP	16	3	260	Detail	Download	N/A	NS UZXYTT L6515SQ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6515.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6515 is located at RoHS Status.

Reference Design

RD-146 - High IF Receiver Reference Design

CAD Symbols and Models Download LMH6515 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH6515SQ	BICMOS8B+	0	3632	0	0	2762292	2	783807897
LMH6515SQX	BICMOS8B+	0	3632	0	0	2762292	2	783807897

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.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6515.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6515 is located at RoHS Status.

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