Features Adjustable gain with a 42 dB range Precise 6.02 dB gain steps Parallel 3 bit gain control On chip register 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 LMH6514 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 LMH6514 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 42 dB. The LMH6514 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 LMH6514 are scaled by a highly linear, digitally controlled attenuator with seven accurate 6 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 +32 dB when driving a 200Ω load, or 38 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 LMH6514 operates over the industrial temperature range of −40°C to +85°C. The LMH6514 is available in a 16-Pin, thermally enhanced, LLP package. Key Specification 600 MHz bandwidth at 100Ω load 39 dBm OIP3 at 75 MHz, 200Ω load 26 dB to 38 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

Also Recommended ADC14155 Complimentary ADC With 14-bit Performance LM97593 Complimentary Dual 12-bit/ 65Msps ADC + DDC (Diversity Receiver Chipset) LMH6515▲ Similar DVGA With 1dB Gain Steps And 31dB Gain Adjust Range CLC5903 Digital Down Converter (Diversity Receiver Chipset) Typical Application

Typical Application click for larger image Typical Application	Block Diagram click for larger image Single Ended Input
Typical Performance click for larger image

Parameters / Values	LMH6514	LMH6515
Gain Adjust Range	42 dB	31 dB
Signal Channel BW	600 MHz	600 MHz
Supply Min	4 Volt	4 Volt
Supply Max	5 Volt	5 Volt
Gain Control Interface	Parallel TTL/CMOS	Parallel TTL/CMOS
Supply Current	107 mA	100 mA
PowerWise Rating 2	167 uA/MHz	167 uA/MHz
Output Current	20 mA	20 mA
Offset Voltage max, 25C	30 mV	30 mV
Voltage Noise	1.8 nV/root(Hz)	1.8 nV/root(Hz)
HD 2nd	-82 dB	-80 dB
HD 3rd	-70 dB	-60 dB
Special Features	6db Steps, Differential I/O	1db Steps, Differential I/O
Function	VGA	VGA
Temperature Min	-40 deg C	-40 deg C
Temperature Max	85 deg C	85 deg C
PowerWise	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier	529 Kbytes	24-Jan-08

Application Notes

Title		Size	Date	Other Language
	AN-1828: Application Note 1828 LMH6514 Digital Controlled Variable Gain Amplifier Evaluation Board	2238 Kbytes	8-Apr-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6514SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$4.50 each at 1K+ pcs	reel of 1000
LMH6514SQE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 451 FARNELL Europe and Asia 118 MOUSER Worldwide 236 RS COMPONENTS Worldwide 15	$4.50 each at 1K+ pcs	reel of 250
LMH6514SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$4.50 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 LMH6514.

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 LMH6514 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6514SQEVAL	Evaluation Kit for the LMH6514	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$340.00 each	1
Description: The LMH6514 evaluation board (part # LMH6514SQEVAL) is designed to aid in the characterization of National Semiconductors High Speed LMH6514 Digital Controlled Variable Gain Amplifier (DVGA). Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization. Contents: LMH6514 Evaluation Board LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier Datasheet Application Note 1828 Digital Controlled Variable Gain Amplifier Evaluation Board

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
LMH6514SQ/NOPB	39.461	LLP	16	3	260	Detail	Download	N/A	NS UZXYTT L6514SQ
LMH6514SQE/NOPB	39.461	LLP	16	3	260	Detail	Download	N/A	NS UZXYTT L6514SQ
LMH6514SQX/NOPB	39.461	LLP	16	3	260	Detail	Download	N/A	NS UZXYTT L6514SQ

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 LMH6514.

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 LMH6514 is located at RoHS Status.

CAD Symbols and Models Download LMH6514 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH6514SQ	BICMOS8B+	0	3632	0	0	2762292	2	783807897
LMH6514SQE	BICMOS8B+	0	3632	0	0	2762292	2	783807897
LMH6514SQX	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 LMH6514.

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 LMH6514 is located at RoHS Status.