RoHS Compliance Information	Size in Kbytes	Date
LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier	529 Kbytes	24-Jan-08	Download

Part Number

Package

Factory Lead Time

Models

Samples & Electronic Orders

Budgetary Pricing

Std Pack Size

Package Marking Format

Type

Pins

Spec.

MSL Rating

Peak Reflow

RoHS Report

CAD Symbols

Weeks

Qty

Qty

$US each

LMH6514SQEVAL

Evaluation Kit for the LMH6514

Full production

N/A

1+

$340.00

1

-

N/A

N/A

LMH6514SQE

LLP

16

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$4.50

reel of 250

NS UZXYTT L6514SQ

6 weeks

500

LMH6514SQ

LLP

16

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$4.50

reel of 1000

NS UZXYTT L6514SQ

6 weeks

N/A

LMH6514SQX

LLP

16

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$4.50

reel of 4500

NS UZXYTT L6514SQ

6 weeks

N/A

General 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.

Reliability Metrics

Application Notes

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

More Application Notes

Title	Size in Kbytes	Date
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	997 Kbytes
AN-1906: Application Note 1906 LMH6518 Evaluation Board	965 Kbytes	23-Oct-08	Download
AN-1942: Application Note 1942 LMH6517 Evaluation Board	3261 Kbytes	28-Oct-09	Download
AN-1718: Application Note 1718 Differential Amplifier Applications Up to 400 MHz	154 Kbytes	14-Nov-07	Download
AN-1718 (Japanese): Application Note 1718 Differential Amplifier Applications Up to 400 MHz	120 Kbytes
AN-1718 (Chinese): Application Note 1718 Differential Amplifier Applications Up to 400 MHz	280 Kbytes