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LMH6502

www.ti.com

SNOSA65D –OCTOBER 2003–REVISED MARCH 2013

LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier

Check for Samples: LMH6502

FEATURES

DESCRIPTION

The LMH™6502 is a wideband DC coupled

• V

= ±5V, T

= 25°C, R

= 1kΩ, R

= 174Ω, R

differential input voltage controlled gain stage

100Ω, A

= A

V(MAX)

= 10 Typical Values Unless

followed by a high-speed current feedback Op Amp

Specified.

which can directly drive a low impedance load. Gain

• -3dB BW: 130MHz

adjustment range is more than 70dB for up to 10MHz.

• Gain Control BW: 100MHz

Maximum gain is set by external components and the

• Adjustment Range (Typical Over Temp): 70dB

gain can be reduced all the way to cut-off. Power

consumption is 300mW with a speed of 130MHz.

• Gain Matching (Limit): ±0.6dB

Output referred DC offset voltage is less than 350mV

• Slew Rate: 1800V/µs

over the entire gain control voltage range. Device-to-

• Supply Current (No Load): 27mA

device Gain matching is within ±0.6dB at maximum

gain. Furthermore, gain at any V

is tested and the

• Linear Output Current: ±75mA

tolerance is ensured. The output current feedback Op

• Output Voltage (R

= 100Ω): ±3.2V

Amp allows high frequency large signals (Slew Rate

• Input Voltage Noise: 7.7nV/√Hz

= 1800V/μs) and can also drive heavy load current

• Input Current Noise: 2.4pA/√Hz

(75mA). Differential inputs allow common mode

rejection in low level amplification or in applications

• THD (20MHz, R

= 100Ω, V

= 2V

): −53dBc

where signals are carried over relatively long wires.

• Replacement for CLC520

For single ended operation, the unused input can

easily be tied to ground (or to a virtual half-supply in

APPLICATIONS

single supply application). Inverting or non-inverting

gains could be obtained by choosing one input

• Variable Attenuator

polarity or the other.

• AGC

To provide ease of use when working with a single

• Voltage Controller Filter

supply, V

range is set to be from 0V to +2V relative

• Video Imaging Processing

to pin 11 potential (ground pin). In single supply

operation, this ground pin is tied to a "virtual" half

supply.

LMH6502 gain control is linear in dB for a large

portion of the total gain control range. This makes the

device suitable for AGC circuits among other

applications. For linear gain control applications, see

the LMH6503 datasheet. The LMH6502 is available in

the SOIC and TSSOP package.

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.

2LMH is a trademark of Texas Instruments.

3All other 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 (29 pages)

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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier Check for Samples: LMH6502 FEATURES DESCRIPTION • The LMH™6502 is a wideband DC coupled differential input voltage controlled gain stage followed by a high-speed current feedback Op Amp which can directly drive a low impedance load. Gain adjustment range is more than 70dB for up to 10MHz.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Application 30 +5V 10 +VIN dB 85°C 0 R1 50: 25°C -10 -40°C -20 85°C -30 6 V/V 4 -40 -60 14 12 4 13 VOUT LMH6502 10 5 7 6 8 R2 50: 2 -40°C -70 RG 170: -VIN 25°C -50 3 NC 1 8 GAIN (V/V) GAIN (dB) RF 1k: 10 20 2 9 RL 100: 11 -5V VIN_DIFF = ±0.1V 0 -80 VG 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 VG (V) Figure 1. Gain vs. VG for Various Temperature Figure 2.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Electrical Characteristics (1) Unless otherwise specified, all limits specified for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ±0.1V, RL = 100Ω, VG = +2V. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (2) Typ (2) Max (2) Units Frequency Domain Response BW -3dB Bandwidth VOUT < 0.5PP 130 VOUT < 0.5PP, AV(MAX) = 100 50 30 MHz GF Gain Flatness VOUT < 0.5VPP 0.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Electrical Characteristics(1) (continued) Unless otherwise specified, all limits specified for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ±0.1V, RL = 100Ω, VG = +2V. Boldface limits apply at the temperature extremes. Symbol DP Parameter Conditions Differential Phase Min (2) f = 4.43MHz, RL = 150Ω, Neg. Sync Typ (2) Max (2) 0.
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LMH6502 www.ti.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. GAIN 150 1 1.0V GAIN 100 0 -1 2.0V 100 0 50 -1 -2 0 -2 0 -3 -50 -3 -50 -4 -100 -4 -100 GAIN (dB) -200 -6 -250 -7 100 10M 100M 1G 1k Figure 4.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. Large Signal Frequency Response for Various AVMAX 270 1 GAIN 0 AVMAX RF (k:) 100 10 2 2k: 1k: 2k: GAIN (dB) -1 -2 -3 100 0 40 135 20 90 -2 0 2 -4 -45 -5 -90 -135 -6 -7 -8 GAIN -1 45 10 2.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. AVMAX vs. VCM AVMAX vs. VCM 12 12 10 8 85°C 6 25°C 4 -40°C 2 AVMAX (V/V) AVMAX (V/V) 10 8 4 VS = ±5V VIN_DIFF = 0.1V VIN_DIFF = 0.1V 2 VG = VGMAX VG = VGMAX 0 -2 -3 -1 -0.8 -0.6 -0.4 -0.2 0 0.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. AVMAX vs. Supply Voltage Supply Current vs. VCM 14 35 -40°C 30 25 85°C 8 25°C -40°C 25°C IS (mA) AVMAX (V/V) 10 6 4 20 15 10 VG = VG_MAX 2 VS = ±5V 5 VG = VGMAX VIN_DIFF = 0.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. Gain Flatness and Linear Phase Deviation vs. VG 40 0.3 2 0.2 1.6 GAIN 20 1.0V 1.2 2.1V GAIN (dB) -20 AVMAX = 100 AVMAX = 2 AVMAX =10 -40 -60 0 0.8 -0.1 PHASE 0.80V 0.4 1.0V -0.2 0 -0.4 -0.3 2.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. BW vs. RF Gain vs. VG (±5V) 30 RG = 100: 10 RG = 466: 100 dB 85°C 0 GAIN (dB) RG = 1190: BW (MHz) 10 20 RG = 180: RG = 47: 10 RG = 27: -40°C -20 85°C -30 4 25°C -50 2 -40°C -70 VIN_DIFF = ±0.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. Output Offset Voltage vs. ±VS for various VG (Typical Unit# 1) Output Offset Voltage vs.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. −1dB Compression Output Voltage vs. Output Current 4.5 24 20 18 RF = 620: 16 14 VG = VGMAX 12 VIN_DIFF = ±0.5V 4 VOUT FROM SUPPLY (V) -1dB COMPRESSION (dBm) RF = 1.46k: 22 SINK 3.5 3 2.5 2 SOURCE 1.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. THD vs. VG THD vs. VG 100 80 0.25VPP 0.25VPP 90 70 1VPP 80 60 2VPP 60 50 |THD (dBc)| |THD (dBc)| 70 1VPP 40 50 40 2VPP 30 30 20 20 10 10 f = 20MHz f = 1MHz 0 0.60 0.80 1.00 1.20 1.40 0 1.60 1.80 2.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VGMAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output. Feedthrough from VG AVMAX= 10 VG (0.5V/DIV) VG Stepped From 0.6V To 1.6V 0 VOUT VG VOUT (50mV/DIV) RL= 100: 0 t (10ns/DIV) Figure 57.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION THEORY OF OPERATION A simplified schematic is shown in Figure 58. +VIN and −VIN are buffered with closed loop voltage followers inducing a signal current in Rg proportional to (+VIN) - (−VIN), the differential input voltage. This current controls a current source which supplies two well-matched transistor, Q1 and Q2.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 ADJUSTING OFFSET Offset can be broken into two parts; an input-referred term and an output-referred term. The input-referred offset shows up as a variation in output voltage as VG is changed. This can be trimmed using the circuit in Figure 59 by placing a low frequency square wave (VLOW = 0V, VHIGH = 2V into VG with VIN = 0V, the input referred VOS term shows up as a small square wave riding a DC value.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com VRMS = ein * 1.57 * (-3dB BANDWIDTH) (5) 10000 AVMAX = 10 RF = 1k: eno (nV/ Hz) RG = 180: MAX GAIN 1000 MID GAIN 100 NO GAIN 10 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 60. Output Referred Voltage Noise vs. Frequency CIRCUIT LAYOUT CONSIDERATIONS & EVALUATION BOARD A good high frequency PCB layout including ground plane construction and power supply bypassing close to the package are critical to achieving full performance.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 SINGLE SUPPLY OPERATION It is possible to operate the LMH6502 with a single supply. To do so, tie pin 11 (GND) to a potential about mid point between V+ and V−. Two examples are shown in Figure 61 & Figure 62. R2 510: R1 510: VS 14 +VIN 13 3 + RG 180: -VIN VS/2 RF 1k: 1 COUT 0.1µF 12 LMH6502 6 8 R4 7 2k: R3 2k: C1 0.1µF 11 2 9 10 ROUT 50: VOUT VG Figure 61. AC Coupled Single Supply VGA C1 0.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com OPERATING AT LOWER SUPPLY VOLTAGES The LMH6502 is rated for operation down to 5V supplies (V+ -V−). There are some specifications shown for operation at ±2.5V within the data sheet (i.e. Frequency Response, CMRR, PSRR, Gain vs. VG, etc.). Compared to ±5V operation, at lower supplies: a) VG range shifts lower. Here are the approximate expressions for various VG voltages as a function of V+: Table 1.
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LMH6502 www.ti.com SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 Figure 63. Automatic Gain Control (AGC) Loop FREQUENCY SHAPING Frequency Shaping Frequency shaping and bandwidth extension of the LMH6502 can be accomplished using parallel networks connected across the RG ports. The network shown in the Figure 64 schematic will effectively extend the LMH6502's bandwidth. Figure 64.
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LMH6502 SNOSA65D – OCTOBER 2003 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 22 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMH6502MAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LMH6502MTX/NOPB TSSOP PW 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6502MAX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LMH6502MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.
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