Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

50W

100W

OCM

100W

IN-

IN+

30MHz

Bandpass

Filter

THS770006

OCM

IN-

IN+

16-Bit

ADC

Frequency(MHz)

100

110

120

130

140

dBFS

25 30 355 15 20 5540 45 5010

THS770006

www.ti.com

SBOS520B –JULY 2010–REVISED JANUARY 2012

Broadband, Fully-Differential, 14-/16-Bit

ADC DRIVER AMPLIFIER

Check for Samples: THS770006

FEATURES

DESCRIPTION

The THS770006 is a fixed-gain of +6dB, wideband,

• 2.4GHz Bandwidth

fully-differential amplifier designed and optimized

• 3100V/µs Slew Rate, V

OUT

=2V Step

specifically for driving 16-bit analog-to-digital

• Fixed Voltage Gain: +6dB

converters (ADCs) at input frequencies up to

130MHz, and 14-bit ADCs at input frequencies up to

• IMD

: –107dBc, V

OUT

= 2V

, R

= 400Ω,

200MHz. This device provides high bandwidth,

f = 100MHz

high-voltage output with low distortion and low noise,

• OIP3: 48dBm, f = 100MHz

critical in high-speed data acquisition systems that

• Noise Figure: 11dB, f = 100MHz

require very high dynamic range, such as wireless

base stations and test and measurement

applications. This device also makes an excellent

APPLICATIONS

differential amplifier for general-purpose, high-speed

• 14-/16-bit ADC Driver

differential signal chain and short line driver

• ADC Driver for Wireless Base Station Signal

applications.

Chains: GSM, WCDMA, MC-GSM

The THS770006 operates on a nominal +5V single

• ADC Driver for High Dynamic Range Test and

supply, offers very fast, 7.5ns maximum recovery

Measurement Equipment

time from overdrive conditions, and has a

power-down mode for power saving. The THS770006

THS770006 Driving 16-Bit ADC

is offered in a Pb-free (RoHS compliant) and green,

QFN-24 thermally-enhanced package. It is

characterized for operation over the industrial

temperature range of –40°C to +85°C.

RELATED DEVICES

DEVICE DESCRIPTION

Wideband, low-noise, low-distortion,

THS4509

fully-differential amplifier

Wideband, low-noise, low-distortion,

PGA870 fully-differential, digitally-programmable

FFT Plot with Two-Tone Input at 96MHz and

gain amplifier

100MHz (see Application Information section).

ADS5481 to

16-bit, 80MSPS to 200MSPS ADCs

ADS5485

ADS6145 14-bit, 125MSPS ADC

ADS6149 14-bit, 250MSPS ADC

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.

2PowerPAD 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 (39 pages)

PAGE 1
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Broadband, Fully-Differential, 14-/16-Bit ADC DRIVER AMPLIFIER Check for Samples: THS770006 FEATURES DESCRIPTION • • • • The THS770006 is a fixed-gain of +6dB, wideband, fully-differential amplifier designed and optimized specifically for driving 16-bit analog-to-digital converters (ADCs) at input frequencies up to 130MHz, and 14-bit ADCs at input frequencies up to 200MHz.
PAGE 2
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 3
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com THERMAL INFORMATION THS770006 THERMAL METRIC (1) RGE UNITS 24 PINS θJA Junction-to-ambient thermal resistance θJC(top) Junction-to-case(top) thermal resistance θJB Junction-to-board thermal resistance 19 ψJT Junction-to-top characterization parameter 0.5 ψJB Junction-to-board characterization parameter 18.8 θJC(bottom) Junction-to-case(bottom) thermal resistance 8.9 (1) 44.
PAGE 4
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Test conditions are at TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output referenced to midsupply, unless otherwise noted. Measured using evaluation module as discussed in Test Circuits section.
PAGE 5
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Test conditions are at TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output referenced to midsupply, unless otherwise noted. Measured using evaluation module as discussed in Test Circuits section.
PAGE 6
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com PIN CONFIGURATION NC NC VS+ VS+ VS+ VS+ NC 24 23 22 21 20 19 RGE PACKAGE VQFN-24 (TOP VIEW) 1 18 NC 17 Unused 16 VOUT+ 15 VOUT- 100W PD 2 50W VIN- 3 VOCM 50W VIN+ 4 100W 11 12 NC NC GND NC 10 13 GND 6 9 NC GND Unused 8 14 GND 5 7 VOCM PIN DESCRIPTIONS PIN NO. NAME 1 NC No internal connection 2 PD Power down. High = low power (sleep) mode. Low = active.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.
PAGE 8
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section.
PAGE 9
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section.
PAGE 10
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section. HARMONIC DISTORTION vs INPUT COMMON-MODE RANGE INTERMODULATION DISTORTION vs FREQUENCY, VOUT = 2VPP, 3VPP ENVELOPE -20 -65 VOCM = 2.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section.
PAGE 12
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section. VOCM PULSE RESPONSE TURN-ON TIME 3.0 4 Power-Down Input and VOUT (V) 2.9 VOUT Common-Mode (V) 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS+ = +5V, VOCM = +2.5V, VOUT = 2VPP, RL = 400Ω differential, G = +6dB, differential input and output, and input and output pins referenced to midsupply, unless otherwise noted. Measured using EVM as discussed in Test Circuits section.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TEST CIRCUITS OVERVIEW The standard THS770006 evaluation module (EVM) is used for testing the typical performance shown in the Typical Characteristics, with changes as noted below. The EVM schematic is shown in Figure 33. The signal generators and analyzers used for most tests have single-ended 50Ω input and output impedance.
PAGE 15
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Figure 33.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TEST DESCRIPTIONS The following sections describe how the tests were performed, as well as the EVM circuit modifications that were made (if any). Modifications made for test purposes include changing capacitors to resistors, resistors to capacitors, the shorting/opening of components, etc., as noted. Unless otherwise noted, C1, C2, C9, and C13 are all changed to 0.1µF.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Transient Response, Slew Rate, Overdrive Recovery The standard EVM is used with T1 and T2 removed and jumpers placed across terminals 3 to 4 and 1 to 6; R15, R17, and R25 = 49.9Ω; C1, C2, C9, and C13 = 0Ω; and R5, R6, R16, and R21 = open. A differential waveform generator is connected to the input of the EVM with 50Ω coaxial cables at J1 and J2.
PAGE 18
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com THEORY OF OPERATION GENERAL DESCRIPTION The THS770006 is a fixed-gain of +6dB, wideband, fully-differential amplifier designed and optimized specifically for driving 14-bit and 16-bit ADCs at input frequencies up to 200MHz.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Single-Ended to Differential The THS770006 can be used to amplify and convert single-ended input signals to differential output signals. A basic block diagram of the circuit is shown in Figure 35. The gain from the single-ended input to the differential output is 6dB. In order to maintain proper balance in the amplifier and avoid offsets at the output, the alternate input must be biased and the impedance matched to the signal input.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Driving Capcitive Loads The THS770006 is tested as described previously, with the data shown in the typical graphs.
PAGE 21
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com This formula shows that if the SNR of the amplifier and filter equals the SNR of the ADC, the combined SNR is 3dB lower (worse). Thus, for minimal impact (< 1dB) on the ADC SNR, the SNR of the amplifier and filter should be ≥ 10dB greater than the ADC SNR. The combined SNR calculated in this manner is usually accurate to within ±1dB of actual implementation.
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THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com ADC Input Common-Mode Voltage Considerations—AC-Coupled Input The input common-mode voltage range of the ADC must be respected for proper operation. In an ac-coupled application between the amplifier and the ADC, the input common-mode voltage bias of the ADC is accomplished in different ways depending on the ADC.
PAGE 23
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Shifting the common-mode voltage with the resistor network comes at the expense of signal attenuation. Modeling the ADC input as the parallel combination of a resistance (RIN) and capacitance (CIN) using values taken from the ADC data sheet, the approximate differential input impedance (ZIN) for the ADC can be calculated at the signal frequency.
PAGE 24
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com The calculated values for the ADS5485 give the lowest attenuation. As a result of the high VFS of 3VPP, 3.66VPP is required from the amplifier to drive to –1dBFS. Performance of the THS770006 is still very good up to 130MHz at this level, but for best performance, back off further from full-scale and consider trading reduced SNR performance for better SFDR performance.
PAGE 25
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com APPLICATION INFORMATION THS770006 DRIVING 16-BIT ADC To illustrate the performance of the THS770006 as an ADC driver, the device is tested with a 16-bit ADC. TESTING WITH AN AC-COUPLED BANDPASS FILTER For testing purposes, a 30MHz, third-order Butterworth bandpass filter with center frequency at 100MHz is designed. The design target for the source impedance is 40Ω differential, and for load impedance is 400Ω differential.
PAGE 26
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com 0 -10 -20 dBFS -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0 5 10 15 20 25 30 35 40 45 Frequency (MHz) 50 55 62.5 Figure 39. FFT Plot of THS770006 + 30MHz BPF + 16-Bit ADC with Single-Tone at 100MHz Table 3. Analysis of FFT for THS770006 + BPF + 16-Bit ADC at 100MHz vs Typical ADC Specifications ADC INPUT SNR THS770006 + BPF + 16-Bit ADC –1dBFS 16-Bit ADC Only (typ) –1dBFS dBFS CONFIGURATION HD2 HD3 75.
PAGE 27
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com TESTING WITH AN AC-COUPLED LOW-PASS FILTER For testing purposes, a 150MHz, first-order, low-pass filter is built. The design gives approximately 1.6dB insertion loss at low frequency, requiring the amplifier signal be 2.7VPP in order to drive the ADC to –1dBFS. With 2.7VPP amplifier output voltage swing and 180MHz (–3dB) bandwidth, the expected SNR from the amplifier + antialias filter is 84.4dB.
PAGE 28
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com EVM AND LAYOUT RECOMMENDATIONS Figure 33 is the THS770006RGE EVM schematic, and Figure 42 through Figure 45 show the layout details of the EVM PCB. Table 5 is the bill of materials for the EVM as supplied from TI. It is recommended to follow the layout of the external components as close as possible to the amplifier, ground plane construction, and power routing. General layout guidelines are: 1. Place a 2.
PAGE 29
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Figure 44. EVM Layout: Layer 2 Figure 45.
PAGE 30
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Table 5. THS770006RGE EVM Bill of Materials ITEM 30 DESCRIPTION SMD SIZE REFERENCE DESIGNATOR QTY MANUFACTURER PART NUMBER DISTRIBUTOR PART NUMBER 1 CAP, 10.0uF, CERAMIC, X7R, 10V 1206 C4, C5, C6 3 (TDK) C3216X7R1A106K (DIGI-KEY) 445-4043-1-ND 2 CAP, 0.1uF, CERAMIC, X7R, 16V 0603 C7, C8 2 (AVX) 0603YC104KAT2A (DIGI-KEY) 478-1239-1-ND 3 CAP, 0.
PAGE 31
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (May 2011) to Revision B Page • Replaced "ADS5493" with "16-Bit Driver" in figure and figure title ....................................................................................... 1 • Deleted ADS5493 from Related Devices table ......................................................................
PAGE 32
THS770006 SBOS520B – JULY 2010 – REVISED JANUARY 2012 www.ti.com Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 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 THS770006IRGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 THS770006IRGET VQFN RGE 24 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) THS770006IRGER VQFN RGE 24 3000 367.0 367.0 35.0 THS770006IRGET VQFN RGE 24 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.