Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Amplifier - Video buffering 710 MHz VSSOP 10

Switching

Stage

Sampling

Comparator (SC)

OPA615

Biasing

OTA

Hold

Control

Emitter

Collector

OUT

)

S/H

In+

S/H

−

∞

−

Adjust

SOTA

BaseC

HOLD

Ground

349

13 5

OPA615

www.ti.com

...................................................................................................................................... SBOS299E –FEBRUARY 2004–REVISED SEPTEMBER 2009

Wide-Bandwidth, DC Restoration Circuit

Check for Samples: OPA615

FEATURES

DESCRIPTION

• PROPAGATION DELAY: 1.9ns

The OPA615 is a complete subsystem for very fast

and precise DC restoration, offset clamping, and

• BANDWIDTH:

low-frequency hum suppression of wideband

OTA: 710MHz

amplifiers or buffers. Although it is designed to

Comparator: 730MHz

stabilize the performance of video signals, the circuit

• LOW INPUT BIAS CURRENT: ±1μA

can also be used as a sample-and-hold amplifier,

• SAMPLE-AND-HOLD SWITCHING

high-speed integrator, or peak detector for

TRANSIENTS: ±5mV

nanosecond pulses. The device features a wideband

Operational Transconductance Amplifier (OTA) with a

• SAMPLE-AND-HOLD FEEDTHROUGH

high-impedance cascode current source output and

REJECTION: 100dB

fast and precise sampling comparator that together

• CHARGE INJECTION: 40fC

set a new standard for high-speed applications. Both

• HOLD COMMAND DELAY TIME: 2.5ns

the OTA and the sampling comparator can be used

as stand-alone circuits or combined to form a more

• TTL/CMOS HOLD CONTROL

complex signal processing stage. The self-biased,

bipolar OTA can be viewed as an ideal

APPLICATIONS

voltage-controlled current source and is optimized for

• BROADCAST/HDTV EQUIPMENT

low input bias current. The sampling comparator has

• TELECOMMUNICATIONS EQUIPMENT

two identical high-impedance inputs and a current

source output optimized for low output bias current

• HIGH-SPEED DATA ACQUISITION

and offset voltage; it can be controlled by a

• CAD MONITORS/CCD IMAGE PROCESSING

TTL-compatible switching stage within a few

• NANOSECOND PULSE INTEGRATOR/PEAK

nanoseconds. The transconductance of the OTA and

DETECTOR

sampling comparator can be adjusted by an external

• PULSE CODE MODULATOR/DEMODULATOR

resistor, allowing bandwidth, quiescent current, and

• COMPLETE VIDEO DC LEVEL RESTORATION gain trade-offs to be optimized.

• SAMPLE-AND-HOLD AMPLIFIER

The OPA615 is available in both an SO-14

• SHC615 UPGRADE

surface-mount and an MSOP-10 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.

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 (32 pages)

PAGE 1
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 Wide-Bandwidth, DC Restoration Circuit Check for Samples: OPA615 FEATURES DESCRIPTION • • The OPA615 is a complete subsystem for very fast and precise DC restoration, offset clamping, and low-frequency hum suppression of wideband amplifiers or buffers.
PAGE 2
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... 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.
PAGE 3
OPA615 www.ti.com......................................................................................................................................
PAGE 4
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS: VS = ±5V RL = 100Ω, RQ = 300Ω, and RIN = 50Ω, unless otherwise noted.
PAGE 5
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 ELECTRICAL CHARACTERISTICS: VS = ±5V (continued) RL = 100Ω, RQ = 300Ω, and RIN = 50Ω, unless otherwise noted.
PAGE 6
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS TA = +25°C and IQ = 13mA, unless otherwise noted. OTA OTA TRANSCONDUCTANCE vs FREQUENCY 120 80 IQ = 13mA (72mA/V), RQ = 300Ω VIN = 100mVPP 50Ω 50Ω Transconductance (mA/V) Transconductance (mA/V) VIN IQ = 14.
PAGE 7
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 TYPICAL CHARACTERISTICS (continued) TA = +25°C and IQ = 13mA, unless otherwise noted.
PAGE 8
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) TA = +25°C and IQ = 13mA, unless otherwise noted. OTA-E OUTPUT PULSE RESPONSE VO = 0.6VPP VO = 1.4VPP −3 Gain (dB) Output Voltage (mV) 0 VO = 5VPP −6 VO = 2.8VPP −9 100Ω V IN 50Ω −12 VO = 0.2VPP VO 200 2.0 160 1.6 120 1.2 0.8 80 Large−Signal ±1.
PAGE 9
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 TYPICAL CHARACTERISTICS (continued) TA = +25°C and IQ = 13mA, unless otherwise noted.
PAGE 10
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) TA = +25°C and IQ = 13mA, unless otherwise noted. SOTA PROPAGATION DELAY vs OVERDRIVE SOTA PROPAGATION DELAY vs TEMPERATURE 1.3 2.0 1.8 Propagation Delay (ns) Propagation Delay (ns) Negative 1.2 Positive 1.1 1.0 100W VOD VOD SOTA GND 0.9 VOD 100W 1.
PAGE 11
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 TYPICAL CHARACTERISTICS (continued) TA = +25°C and IQ = 13mA, unless otherwise noted.
PAGE 12
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.
PAGE 13
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 Figure 35 shows a simplified block diagram of the OPA615 OTA. Both the emitter and the collector outputs offer a drive capability of ±20mA for driving low impedance loads. The emitter output is not current-limited or protected.
PAGE 14
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com Figure 37 shows the Common-C amplifier. It constitutes an open-loop buffer with low offset voltage. Its gain is approximately 1 and will vary with the load. 12 C V+ 100Ω VI Figure 38 shows the Common-B amplifier. This configuration produces an inverting gain, and the input is low-impedance.
PAGE 15
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 SAMPLING COMPARATOR The OPA615 sampling comparator features a very short switching (2.5ns) propagation delay and utilizes a new switching circuit architecture to achieve excellent speed and precision.
PAGE 16
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com APPLICATION INFORMATION The OPA615 operates from ±5V power supplies (±6.2V maximum). Absolute maximum is ±6.5V. Do not attempt to operate with larger power supply voltages or permanent damage may occur. Power-supply bypass capacitors should be located as close as possible to the device pins.
PAGE 17
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 DC-RESTORE SYSTEM Figure 40 and Figure 41 offer two possible DC-restore systems using the OPA615. Figure 41 implements a DC-restore function as a unity-gain amplifier. As can be expected from its name, this DC-restore circuit does not provide any amplification.
PAGE 18
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com The DC restoration is done by the SOTA section by sampling the output signal at an appropriate time. The sampled section of the signal is then compared to a reference voltage that appears on the non-inverting input of the SOTA (pin 10), or ground in Figure 40.
PAGE 19
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 CLAMPED VIDEO/RF AMPLIFIER Another circuit example for the preamplifier and the clamp circuit is shown in Figure 44. The preamplifier uses the wideband, low noise OPA656, again configured in a gain of +2V/V. Here, the OPA656 has a typical bandwidth of 200MHz with a settling time of about 21ns (0.
PAGE 20
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com Integrator for ns-Pulses Phase Detector for Fast PLL Systems The integrator for ns-pulses using the OPA615 (shown in Figure 47) makes use of the fast comparator and its current-mode output. Placing the hold-control high, a narrow pulse charges the capacitor, increasing the average output voltage.
PAGE 21
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 CORRELATED DOUBLE SAMPLER The signal coming from the CCD is applied to the two sample-and-hold amplifiers, with their outputs connected to the difference amplifier. The timing diagram clarifies the operation (see Figure 52).
PAGE 22
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com Simplified CCD Output Signal S1 kT/C −Noise PP ∆V Reset Level S2 Video Level NOTE: Signals are out of scale. Figure 51.
PAGE 23
OPA615 www.ti.com...................................................................................................................................... SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009 BOARD LAYOUT GUIDELINES Achieving optimum performance with a highfrequency amplifier such as the OPA615 requires careful attention to printed circuit board (PCB) layout parasitics and external component types.
PAGE 24
OPA615 SBOS299E – FEBRUARY 2004 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision D (August 2008) to Revision E ................................................................................................ Page • Corrected y-axis title of Figure 25 ....
PAGE 25
PACKAGE OPTION ADDENDUM www.ti.
PAGE 26
PACKAGE OPTION ADDENDUM www.ti.com (4) 18-Oct-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PAGE 27
PACKAGE MATERIALS INFORMATION www.ti.com 2-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing OPA615IDGSR VSSOP DGS 10 OPA615IDGST VSSOP DGS OPA615IDR SOIC D SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 10 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.
PAGE 28
PACKAGE MATERIALS INFORMATION www.ti.com 2-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA615IDGSR VSSOP DGS 10 2500 367.0 367.0 35.0 OPA615IDGST VSSOP DGS 10 250 210.0 185.0 35.0 OPA615IDR SOIC D 14 2500 367.0 367.0 38.
PAGE 29
PAGE 30
PAGE 31
PAGE 32
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 JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.