Datasheet

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GAIN

200

ADC14155

OUT

LATCH

LMH6514

LOAD

LMH6514

www.ti.com

SNOSB06A –JANUARY 2008–REVISED MARCH 2013

LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier

Check for Samples: LMH6514

FEATURES

DESCRIPTION

The LMH6514 is a high performance, digitally

• Adjustable Gain with a 42 dB Range

controlled variable gain amplifier (DVGA). It combines

• Precise 6.02 dB Gain Steps

precision gain control with a low noise, ultra-linear,

• Parallel 3 Bit Gain Control

differential amplifier. Typically, the LMH6514 drives a

high performance ADC in a broad range of mixed

• On Chip Register Gain Setting

signal and digital communication applications such as

• Fully Differential Signal Path

mobile radio and cellular base stations where

• Single Ended to Differential Capable

automatic gain control (AGC) is required to increase

system dynamic range. When used in conjunction

• 200Ω Input Impedance

with a high speed ADC, system dynamic range can

• Small Footprint (4 mm x 4 mm) WQFN Package

be extended by up to 42 dB.

The LMH6514 has a differential input and output

APPLICATIONS

allowing large signal swings on a single 5V supply. It

• Cellular Base Stations

is designed to accept signals from RF elements and

• IF Sampling Receivers

maintain a terminated impedance environment. The

input impedance is 200Ω resistive. The output

• Instrumentation

impedance is either 200Ω or 400Ω and is user

• Modems

selectable. A unique internal architecture allows use

• Imaging

with both single ended and differential input signals.

• Differential Line Receiver

Input signals to the LMH6514 are scaled by a highly

linear, digitally controlled attenuator with seven

KEY SPECIFICATIONS

accurate 6 dB steps. The attenuator output provides

the input signal for a high gain, ultra linear differential

• 600 MHz bandwidth at 100Ω load

transconductor. The transconductor differential output

• 39 dBm OIP3 at 75 MHz, 200Ω load

current can be converted into a voltage by using the

• 26 dB to 38 dB maximum gain

on-chip 200Ω or 400Ω loads. The transconductance

gain is 0.1 Amp/Volt resulting in a maximum voltage

• Selectable output impedance of 200Ω or 400Ω.

gain of +32 dB when driving a 200Ω load, or 38 dB

• 8.3 dB noise figure

when driving the 400Ω load.

• 5 ns gain step switching time

The LMH6514 operates over the industrial

• 100 mA supply current

temperature range of −40°C to +85°C. The LMH6514

is available in a 16-Pin, thermally enhanced, WQFN

package.

Typical Application

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (28 pages)

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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier Check for Samples: LMH6514 FEATURES 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.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) Human Body Model 2 kV Machine Model 150V Positive Supply Voltage (Pin 3) −0.6V to 5.5V Output Voltage (Pin 14,15) −0.6V to 6.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 5V Electrical Characteristics (1) The following specifications apply for single supply with VCC = 5V, Maximum Gain , RL = 100Ω (200Ω external || 200Ω internal), VOUT = 2 VPP, fin = 150 MHz. Boldface limits apply at temperature extremes.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 5V Electrical Characteristics(1) (continued) The following specifications apply for single supply with VCC = 5V, Maximum Gain , RL = 100Ω (200Ω external || 200Ω internal), VOUT = 2 VPP, fin = 150 MHz. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units Maximum Differential Output Voltage Swing VCC = 5V, Output Common Mode = 5V 5.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 NC V+ LATCH NC 4 3 2 1 Connection Diagram GND 5 16 LOAD- IN+ 6 15 OUT- IN- 7 14 OUT+ GND 8 13 LOAD+ 9 10 11 12 GAIN_2 GAIN_1 GAIN_0 NC GND Figure 1. 16-Pin WQFN (Top View) Gain Control Pins Pin Number Pin Name Gain Step Size 11 GAIN_0 6.02 dB 10 GAIN_1 12.04 dB 9 GAIN_2 24.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com PIN DESCRIPTIONS Pin Number Symbol Description 6 IN+ Non-inverting analog input. Internally biased to 1.4V. Input voltage should not exceed VCC or go below GND by more than 0.5V. 7 IN− Inverting analog input. Internally biased to 1.4V. Input voltage should not exceed VCC or go below GND by more than 0.5V. If using amplifier single ended this input should be capacitively coupled to ground. 15 OUT− Open collector inverting output.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics VCC = 5V Frequency Response over Temperature, Maximum Gain 26 25 -40°C GAIN (dB) GAIN (dB) Frequency Response All Gain Settings 26 23 20 17 14 11 8 5 2 -1 -4 -7 -10 -13 -16 -19 RL = 100: -22 1 10 24 25°C 23 85°C 22 PIN = -16 dBm RL = 100: 21 100 1000 100 10 FREQUENCY (MHz) Figure 2. Figure 3.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VCC = 5V (continued) IMD3 Low Gain Mode -55 -40 VOUT = 2 VPP RL = 100: -45 INPUT CLIPPING RL = 200: -60 -65 -50 INPUT CLIPPING IMD3 (dBc) IMD3 (dBc) IMD3 High Gain Mode VOUT = 2 VPP -55 f = 250 MHz -60 f = 250 MHz -70 -75 f = 150 MHz f = 150 MHz -80 -65 f = 75 MHz f = 75 MHz -70 1 0 2 3 4 5 6 -85 0 7 1 GAIN STEP (0 = MAXIMUM GAIN) 5 HD2 vs. Frequency HD3 vs.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics VCC = 5V (continued) Noise Figure for All Gain Settings Noise Figure vs. Frequency 55 13 MAXIMUM GAIN 50 12 f = 150 MHz NOISE FIGURE (dB) NOISE FIGURE (dB) 45 40 35 30 f = 75 MHz 25 20 11 10 15 9 10 5 0 1 2 3 4 5 6 8 7 0 100 GAIN SETTING (0 = MAXIMUM GAIN) 200 Figure 15. Differential Output Noise Maximum Gain vs.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VCC = 5V (continued) Worst Case Gain Step Error vs Frequency Gain Steps over Temperature 6.25 6.45 f = 150 MHz VOUT = 1 VPP 6.40 RL = 100: 6.35 GAIN STEP SIZE (dB) STEP SIZE (dB) f = 250 MHz 6.30 f = 150 MHz 6.25 f = 75 MHz 6.20 6.15 6.10 6.20 VOUT = 2 VPP RL = 100: 6.15 6.10 85°C 25°C 6.05 6.00 -40°C 6.05 5.95 6.00 IDEAL 5.95 1 2 3 HIGH GAIN 4 5.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics VCC = 5V (continued) Output Impedance (S22) at Maximum Gain High Gain Mode Digital Crosstalk 350 40 300 30 250 |Z| 200 150 100 R 50 jX 0 20 10 0 -10 3 -20 -30 GAIN CONTROL SIGNALS (V) DIFFERENTIAL OUTPUT (mV) INPUT IMPEDANCE (:) LATCH = 0 PINS 9, 10, 11,12 -40 -50 50 100 150 200 250 300 350 400 450 0 10 20 30 40 50 60 70 80 90 100 0 TIME (ns) FREQUENCY (MHz) Figure 26. Figure 27.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VCC = 5V (continued) 24 dB Gain Step 4 3 3 GAIN BIT 2 1 1 0 0.5 0 VOUT (V) 1.5 2 GAIN BIT 2 (V) 1 1 0 0.5 0 VOUT -1 -1 -1.5 -1.5 0 10 VOUT -0.5 20 30 40 0 10 TIME (ns) 20 30 TIME (ns) Figure 32. Figure 33. 12 dB Gain Step 12 dB Gain Step 4 4 3 3 GAIN BIT 1 GAIN BIT 1 1 1 0 0.5 0 VOUT (V) 1.5 2 GAIN BIT 1 (V) VOUT (V) 2 1.5 1 1 0 0.5 0 -0.5 -0.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 Typical Performance Characteristics VCC = 5V (continued) 0.4 V 0.3 5 0.2 4 0.2 4 3 VOUT 0 2 -0.1 1 -0.2 0 20 25 3 0.1 VOUT 0 2 -0.1 1 -0.2 0 -0.3 f = 250 MHz ENVELOPE DISPLAYED -0.4 0 5 10 15 -10 -5 30 20 TIME (Ps) TIME (Ps) Figure 38. Figure 39. Power Off Timing, Maximum Gain 0.3 f = 250 MHz ENVELOPE DISPLAYED 5 0.3 4 0.2 0.1 3 0 2 -0.1 1 0 -0.2 VOUT (V) 0.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION The LMH6514 is a fully differential amplifier optimized for signal path applications up to 400 MHz. The LMH6514 has a 200Ω input. The absolute gain is load dependent, however the gain steps are always 6 dB. The LMH6514 output stage is a class A amplifier. This class A operation results in excellent distortion and linearity characteristics.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 16 OUT- 13 200: 200: OUT+ 0 to -42 dB 6 400: 6dB STEP VARIABLE ATTENUATOR 200: 7 14 15 +38 dB +IN + - -IN 5, 8 Figure 44. LMH6514 Block Diagram INPUT CHARACTERISTICS The LMH6514 input impedance is set by internal resistors to a nominal 200Ω. Process variations will result in a range of values as shown in the Electrical Characteristics table. At higher frequencies parasitics will start to impact the impedance.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com SOURCE IMPEDANCE = 50: f = 100 MHz 5V VIN L1 ZIN LMH6514 C1 ZAMP C3 C2 5 C3 = 22 pF L1 = 169 nH GAIN 1-5 C1 = 1 nF LATCH C2 = 1 nF ZAMP = (150 ± j0): ZIN = (50 ± j1): Figure 46. Single Ended Input with LC Matching As shown in Figure 46 a single ended 50Ω source is matched to the LMH6514 input at 100 MHz.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 OUTPUT CHARACTERISTICS The LMH6514 has the option of two different output configurations. The LMH6514 is an open collector topology. As shown in Figure 52 each output has an on chip 200Ω pull up resistor. In addition there is an internal 400Ω resistor between the two outputs. This results in a 200Ω or a 400Ω differential load in parallel with the external load. The 400Ω option is the high gain option and the 200Ω provides for less gain.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 26 MAXIMUM GAIN (dB) 25.5 f = 75 MHz 25 f = 150 MHz 24.5 f = 250 MHz 24 23.5 VOUT = 2 VPP RL = 100: 23 -40 -20 0 20 40 60 80 TEMPERATURE (°C) Figure 49. Gain vs. External Load DIGITAL CONTROL The LMH6514 has eight gain settings covering a range of 42 dB. To avoid undesirable signal transients the LMH6514 should be powered on at the minimum gain state (all logic input pins at 0V).
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 The output common mode voltage is not self biasing, it needs to be pulled up to the positive supply rail with external inductors as shown in Figure 42. This gives the LMH6514 the capability for large signal swings with very low distortion on a single 5V supply. The internal load resistors provide the LMH6514 with very consistent gain.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com 5V L1 L3 AMP VOUT - C1 L5 AMP VOUT + L2 ADC ZIN C2 L4 R1 C3 AMP ZOUT R2 ADC VIN + ADC VIN - ADC VCM 5V Figure 51. Sample Filter POWER SUPPLIES As shown in Figure 52, the LMH6514 has a number of options for power supply connections on the output pins. Pin 3 (VCC) is always connected. The output stage can be connected as shown in Figure 53, Figure 54, and Figure 55. The supply voltage range for VCC is 4V to 5.25V.
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LMH6514 VCC LATCH NC 2 1 NC 1 3 LATCH 2 NC VCC 3 4 NC SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 4 www.ti.com 5V GND 5 16 LOAD- IN+ 6 15 OUT- IN- 7 14 OUT+ GND 8 13 LOAD+ GND 5 16 NC IN+ 6 15 OUT- IN- 7 14 OUT+ GND 8 13 NC VOUT 11 12 NC GAIN_2 NC VCC LATCH NC 3 2 1 NC 1 5V Figure 53. Using High Gain Mode (400Ω Load) 4 LATCH 2 GAIN_0 12 NC VCC 3 10 11 GAIN_0 NC 4 Figure 52.
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LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com Table 2.
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LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 REVISION HISTORY Changes from Original (March 2013) to Revision A • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LMH6514SQ/NOPB WQFN RGH 16 LMH6514SQE/NOPB WQFN RGH LMH6514SQX/NOPB WQFN RGH SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 16 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 16 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6514SQ/NOPB WQFN RGH 16 1000 213.0 191.0 55.0 LMH6514SQE/NOPB WQFN RGH 16 250 213.0 191.0 55.0 LMH6514SQX/NOPB WQFN RGH 16 4500 367.0 367.0 35.
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MECHANICAL DATA RGH0016A SQA16A (Rev A) www.ti.
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