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OPA687N/3K Datasheet

  • OPA687N/3K

  • Voltage-Feedback Operational Amplifier

  • 17頁(yè)

  • ETC

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OPA
687
OPA687
www.ti.com
Wideband, Ultra-Low Noise,
Voltage Feedback OPERATIONAL AMPLIFIER
With Power Down
TM
FEATURES
q
HIGH GAIN BANDWIDTH: 3.8GHz
q
LOW INPUT VOLTAGE NOISE: 0.95nV/鈭欻z
q
VERY LOW DISTORTION: 鈥?5dBc (5MHz)
q
LOW DISABLED POWER: 2mW
q
VERY HIGH SLEW RATE: 900V/
碌
s
q
STABLE FOR G
鈮?/div>
12
APPLICATIONS
q
q
q
q
q
q
LOW DISTORTION ADC DRIVER
OC-3 FIBER OPTIC RECEIVER
LOW NOISE DIFFERENTIAL AMPLIFIERS
EQUALIZING RECEIVERS
ULTRASOUND CHANNEL AMPLIFIERS
IMPROVED REPLACEMENT FOR THE
CLC425
DESCRIPTION
The OPA687 combines a very high gain bandwidth and
large signal performance with an ultra-low input noise
voltage (0.95nV/鈭欻z) while dissipating only 18mA sup-
ply current. Where power savings is paramount, the
OPA687 also includes an optional power down pin that,
when pulled low, will disable the amplifier and decrease
the quiescent current to only 1% of its powered up value.
This optional feature may be left disconnected to insure
normal amplifier operation when no power-down is re-
quired.
The combination of low input voltage and current noise,
along with a 3.8GHz gain bandwidth product, make the
OPA687 an ideal amplifier for wideband transimpedance
+5V
V
CM
100鈩?/div>
OPA687
20鈩?/div>
stages. As a voltage gain stage, the OPA687 is opti-
mized for a flat frequency response at a gain of +20 and
is guaranteed stable down to gains of +12. New external
compensation techniques allows the OPA687 to be used
at any inverting gain with excellent frequency response
control. Using this compensation can give an extremely
high dynamic range ADC driver to support > 40MSPS
12- and 14-bit converters.
OPA687 RELATED PRODUCTS
SINGLES
OPA642
OPA643
OPA686
DUAL
鈥?/div>
鈥?/div>
OPA2686
INPUT NOISE
VOLTAGE (nV/鈭欻z)
2.7
2.3
1.3
GAIN BANDWIDTH
PRODUCT (MHz)
210
800
1600
+5V
鈥?0
50鈩?Source
鈥?V
V
IN
+
80pF
850鈩?/div>
ADS852
14-Bit
65MSPS
3rd-Order Spurious (dBc)
1.7pF
39pF
鈥?5
4Vp-p
鈥?0
1:2
< 6dB
Noise
Figure
39pF
850鈩?/div>
鈥?5
2Vp-p
+5V
100鈩?/div>
OPA687
V
CM
1.7pF
20鈩?/div>
80pF
V
IN
鈥?/div>
鈥?0
鈥?5
0
5
10
15
20
25
30
35
40
45
50
Center Frequency (MHz)
鈥?V
Ultra-High Dynamic Range
Differential Input ADC Driver
Measured 2-Tone, 3rd-Order Distortion for
Differential ADC Driver.
Copyright 漏 1998, Texas Instruments Incorporated
SBOS065A
Printed in U.S.A. January, 2001

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