The OPA3691 sets a new level of performance for broadband, triple current-feedback op amps

OPA3691

Manufacturer Part NumberOPA3691
DescriptionThe OPA3691 sets a new level of performance for broadband, triple current-feedback op amps
ManufacturerTexas Instruments
OPA3691 datasheet
 


Specifications of OPA3691

Number Of Channels3Bw @ Acl(mhz)280
Acl, Min Stable Gain(v/v)1Slew Rate(typ)(v/us)2100
Settling Time (0.1%)(typ)(ns)8Vn At Flatband(typ)(nv/rthz)1.7
Vs(min)(v)5Vs(max)(v)12
Iq Per Channel(max)(ma)5.1Io(typ)(ma)190
2nd Harmonic(dbc)793rd Harmonic(dbc)93
@ Mhz5Thd (fc=1 Mhz)(typ)(db)-80
Diff Gain(%)0.07Diff Phase(deg)0.02
Vio(max)(mv)3Offset Voltage Drift (+/-)(max)(uv/degrees Celsius)20
Iib(max)(na)45000Operating Temperature Range(c)-40 to 85
Pin/package16SOIC, 16SSOP/QSOP  
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Triple Wideband, Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
FLEXIBLE SUPPLY RANGE:
+5V to +12V Single-Supply
2.5V to 6V Dual Supply
UNITY-GAIN STABLE: 280MHz (G = 1)
HIGH OUTPUT CURRENT: 190mA
OUTPUT VOLTAGE SWING: 4.0V
HIGH SLEW RATE: 2100V/ s
LOW SUPPLY CURRENT: 5.1mA/ch
LOW DISABLED CURRENT: 150 A/ch
IMPROVED HIGH-FREQUENCY PINOUT
WIDEBAND +5V OPERATION: 190MHz (G = +2)
APPLICATIONS
RGB AMPLIFIERS
WIDEBAND INA
BROADBAND VIDEO BUFFERS
HIGH-SPEED IMAGING CHANNELS
PORTABLE INSTRUMENTS
ADC BUFFERS
ACTIVE FILTERS
CABLE DRIVERS
+5V
V
1
1/3
OPA3691
250
–5V
301
250
66.5
301
+5V
499
1/3
OPA3691
V
2
High-Speed INA (120MHz)
–5V
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.
All 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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
DESCRIPTION
The OPA3691 sets a new level of performance for broad-
band, triple current-feedback op amps. Operating on a very
low 5.1mA/ch supply current, the OPA3691 offers a slew
rate and output power normally associated with a much
higher supply current. A new output stage architecture
delivers a high output current with minimal voltage head-
room and crossover distortion. This gives exceptional single-
supply operation. Using a single +5V supply, the OPA3691
can deliver a 1V to 4V output swing with over 120mA drive
current and 150MHz bandwidth. This combination of fea-
tures makes the OPA3691 an ideal RGB line driver or
single-supply Analog-to-Digital Converter (ADC) input driver.
The OPA3691’s low 5.1mA/ch supply current is precisely
trimmed at 25 C. This trim, along with low drift over tem-
perature, ensures lower maximum supply current than com-
peting products. System power may be further reduced by
using the optional disable control pin. Leaving this disable
pin open, or holding it HIGH, gives normal operation. If
pulled LOW, the OPA3691 supply current drops to less than
150 A/ch while the output goes into a high impedance
state. This feature may be used for power savings.
OPA3691 RELATED PRODUCTS
Voltage-Feedback
Current-Feedback
Fixed Gain
+5V
25
10 (V
– V
)
1
2
1/3
20
OPA3691
–5V
15
499
10
5
0
0.1
www.ti.com
OPA3691
SBOS227E – DECEMBER 2001 – REVISED JULY 2008
SINGLES
DUALS
TRIPLES
OPA690
OPA2690
OPA3690
OPA691
OPA2691
OPA3681
OPA692
OPA3692
HIGH-SPEED INA FREQUENCY RESPONSE
1
10
100
400
Frequency (MHz)
Copyright © 2001-2008, Texas Instruments Incorporated

OPA3691 Summary of contents

  • Page 1

    ... Leaving this disable pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA3691 supply current drops to less than 150 A/ch while the output goes into a high impedance state. This feature may be used for power savings. ...

  • Page 2

    ... OUT B DIS – OUT +IN C –V S www.ti.com ORDERING TRANSPORT NUMBER MEDIA, QUANTITY OPA3691IDBQT Tape and Reel, 250 " OPA3691IDBQR Tape and Reel, 2500 OPA3691ID Rails, 48 " OPA3691IDR Tape and Reel, 2500 SSOP, SO OPA3691 SBOS227E ...

  • Page 3

    ... +190 –190 250 + 100kHz 0.03 is the input common-mode voltage. CM CMIR limits. www.ti.com OPA3691ID, IDBQ MIN/MAX OVER TEMPERATURE – MIN/ (1) (2) (2) + +85 C UNITS MAX MHz typ 200 190 180 MHz min MHz ...

  • Page 4

    ... L IN 3.3 1 Each Channel 75 DIS 15 15.3 S Input Referred 58 –40 to +85 100 100 www.ti.com (Cont.) OPA3691ID, IDBQ MIN/MAX OVER TEMPERATURE – MIN/ (1) (2) (2) + +85 C UNITS MAX –900 –1050 –1200 A max ns typ ns typ dB typ pF typ ...

  • Page 5

    ... Each Channel 75 DIS +5V 13 +5V 13.5 S Input Referred 55 –40 to +85 100 100 CMIR limits. www.ti.com OPA3691ID, IDBQ MIN/MAX OVER TEMPERATURE – MIN/ (1) (2) (2) + +85 C UNITS MAX MHz typ 168 160 140 MHz min MHz ...

  • Page 6

    ... LARGE-SIGNAL FREQUENCY RESPONSE 100 L 2Vp-p 1Vp-p 4Vp-p 7Vp-p 125MHz Frequency (25MHz/div) LARGE-SIGNAL PULSE RESPONSE 5Vp-p O Time (5ns/div) DISABLED FEEDTHROUGH vs FREQUENCY DIS Reverse Forward 1 10 Frequency (MHz) OPA3691 250MHz 100 SBOS227E ...

  • Page 7

    ... Frequency (MHz) HARMONIC DISTORTION vs NONINVERTING GAIN – 2Vp 100 5MHz –60 2nd-Harmonic –70 3rd-Harmonic –80 –90 1 Gain (V/V) OPA3691 SBOS227E = 5V (Cont.) S HARMONIC DISTORTION vs SUPPLY VOLTAGE –60 –65 2nd-Harmonic –70 –75 3rd-Harmonic –80 –85 1000 2.5 HARMONIC DISTORTION vs OUTPUT VOLTAGE – 100 ...

  • Page 8

    ... FREQUENCY RESPONSE vs CAPACITIVE LOAD 22pF 47pF 1/3 O OPA3691 402 402 C = 100pF optional. 125MHz Frequency (25MHz/div) OPEN-LOOP TRANSIMPEDANCE GAIN/PHASE | 100k 1M 10M 100M Frequency (Hz) OPA3691 20MHz 10pF 250MHz 0 –40 –80 –120 –160 –200 –240 1G SBOS227E ...

  • Page 9

    ... Load Line 100 Load Line 1W Internal Power Limit Single Channel –250 –200 –150 –100 –50 0 +50 +100 +150 +200 I (mA) O CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY +5V 1/3 OPA3691 402 –5V 402 100k 1M 10M Frequency (Hz) ALL HOSTILE CROSSTALK 1 10 Frequency (MHz) 25 +250 +300 100M 100 9 ...

  • Page 10

    ... L 125MHz Frequency (25MHz/div) LARGE-SIGNAL PULSE RESPONSE 2Vp-p O Time (5ns/div) FREQUENCY RESPONSE vs CAPACITIVE LOAD 47pF 22pF L +5V 806 0 1 100pF 57.6 806 OPA3691 453 453 0 optional. 125MHz Frequency (25MHz/div) OPA3691 250MHz = 10pF L 250MHz SBOS227E ...

  • Page 11

    ... Resistance ( ) HARMONIC DISTORTION vs OUTPUT VOLTAGE – 100 to 2. 5MHz –65 –70 –75 –80 0.1 Output Voltage Swing (Vp-p) OPA3691 SBOS227E = +5V (Cont.) S – 2Vp 5MHz R –60 –70 –80 –90 0.1 1000 –30 dBc = dB below carriers –40 2nd-Harmonic – ...

  • Page 12

    ... The OPA3691 gives the exceptional AC performance of a wideband current-feedback op amp with a highly linear, high- power output stage. Requiring only 5.1mA/ch quiescent current, the OPA3691 will swing to within 1V of either supply rail and deliver in excess of 160mA at room temperature. This low output headroom requirement, along with supply voltage independent biasing, gives remarkable single (+5V) supply operation ...

  • Page 13

    ... CMOS pipelined ADCs. Three channels of very high-speed digitizer channels are shown in Figure 3 using the OPA3691 driving three ADS831s (8-bit, 80MSPS CMOS converters). Each input is AC-coupled into a 50 gain resistor that also will act impedance match at high frequencies. The amplifier’ ...

  • Page 14

    ... The first stage provides a tunable gain (using R 100pF +5V 237 402 82.5 1/3 220pF 56pF OPA3691 402 www.ti.com f –3dB 1 10 Frequency (MHz) ) with a fixed termination for G 100pF +5V 243 412 75.5 1/3 220pF 56pF OPA3691 402 402 100 F OPA3691 SBOS227E 100 V O ...

  • Page 15

    ... Very broad band- widths at high power levels are possible using the OPA3691 in the circuit of Figure 7. Recognize also, that the output is in fact bandlimited by the filter. Very high dynamic range is possible inside the filter bandwidth due to the significant performance margin provided by the OPA3691 ...

  • Page 16

    ... OPERATING SUGGESTIONS SBOU007 SETTING RESISTOR VALUES TO OPTIMIZE BANDWIDTH A current-feedback op amp like the OPA3691 can hold an almost constant bandwidth over signal gain settings with the proper adjustment of the external resistor values. This is shown in the Typical Characteristics; the small-signal band- width decreases only slightly with increasing gain. These curves also show that the feedback resistor has been changed for each gain setting ...

  • Page 17

    ... The difference here is that the total impedance in the denominator of Equation 2 may be controlled some- what separately from the desired signal gain (or NG). The OPA3691 is internally compensated to give a maximally flat frequency response for R supplies. Evaluating the denominator of Equation 2 (which is the feedback transimpedance) gives an optimal target of 476 . ...

  • Page 18

    ... Safe Operating Area maximum internal power dissipation. Superimposing resistor load lines onto the plot shows that the OPA3691 can drive 2.5V into 25 or 3.5V into 50 without exceeding the output capabilities or the 1W dissipation limit. A 100 line (the standard test circuit load) shows the full output swing capability, as shown in the Electrical Character- istics Table ...

  • Page 19

    ... To protect the output stage from accidental shorts to ground and the power supplies, output short-circuit protection is included in the OPA3691. This circuit acts to limit the maxi- mum source or sink current to approximately 250mA. DRIVING CAPACITIVE LOADS One of the most demanding and yet very common load conditions for an op amp is capacitive loading. Often, the capacitive load is the input of an ADC— ...

  • Page 20

    ... When disabled, the output and input nodes high impedance state. If the OPA3691 is operating in a gain of +1, this will show a very high impedance (4pF || the output and exceptional signal isolation. If operating at a ...

  • Page 21

    ... Note that it is the power in the output stage and not into the load that determines internal power dissipation. OPA3691 SBOS227E As a worst-case example, compute the maximum T OPA3691 SO-16 (see the circuit of Figure 1), operating at the maximum specified ambient temperature of +85 C with all three outputs driving a grounded 10V • 17.1mA + 3 • [5 ...

  • Page 22

    ... Distortion vs Load plots. With a characteristic board trace impedance defined based on board material and trace dimensions, a matching series resistor into the trace from the output of the OPA3691 is used as well as a terminating shunt resistor at the input of the destination device. Remember also that the terminating im- ...

  • Page 23

    ... Electrical Characteristics, Power Supply 2/ Typical Characteristics NOTE: Page numbers for previous revisions may differ from page numbers in the current version. OPA3691 SBOS227E Revision History DESCRIPTION Changed Storage Temperature Range from +125C +125C. Added minimum supply voltage. Changed Closed-Loop Output Impedance vs Frequency plot. ...

  • Page 24

    ... ACTIVE OPA3691IDBQR ACTIVE OPA3691IDBQRG4 ACTIVE OPA3691IDBQT ACTIVE OPA3691IDBQTG4 ACTIVE OPA3691IDG4 ACTIVE OPA3691IDR ACTIVE OPA3691IDRG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. ...

  • Page 25

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing OPA3691IDBQR SSOP/ DBQ QSOP OPA3691IDBQT SSOP/ DBQ QSOP OPA3691IDR SOIC PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel Diameter Width (mm) W1 (mm) 16 2500 330.0 12.4 16 250 180.0 12 2500 330 ...

  • Page 26

    ... Device Package Type OPA3691IDBQR SSOP/QSOP OPA3691IDBQT SSOP/QSOP OPA3691IDR SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) DBQ 16 2500 DBQ 16 250 D 16 2500 Pack Materials-Page 2 17-Dec-2011 Width (mm) Height (mm) 346.0 346.0 29.0 210.0 185.0 35.0 346.0 346.0 33.0 ...

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    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...