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OPA4684ID Datasheet

  • OPA4684ID

  • Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER

  • 26頁

  • BB

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OPA
4 68
4
OPA4684
SBOS240B 鈥?JUNE 2002 鈥?REVISED AUGUST 2002
OPA
468
4
廬
Quad, Low-Power, Current-Feedback
OPERATIONAL AMPLIFIER
FEATURES
q
q
q
q
q
q
q
q
MINIMAL BANDWIDTH CHANGE VERSUS GAIN
170MHz BANDWIDTH AT G = +2
> 120MHz BANDWIDTH TO GAIN > +10
LOW DISTORTION: < 鈥?8dBc at 5MHz
HIGH OUTPUT CURRENT: 120mA
SINGLE +5V TO +12V SUPPLY OPERATION
DUAL
鹵
2.5 TO
鹵
6.0V SUPPLY OPERATION
LOW SUPPLY CURRENT: 6.8mA Total
APPLICATIONS
q
q
q
q
q
q
LOW-POWER BROADCAST VIDEO DRIVERS
EQUALIZING FILTERS
SAW FILTER HIGH-GAIN POST AMPLIFIERS
MULTICHANNEL SUMMING AMPLIFIERS
WIDEBAND DIFFERENTIAL CHANNELS
ANALOG-TO-DIGITAL CONVERTERS (ADC)
INPUT DRIVERS
q
MULTIPLE POLE ACTIVE FILTERS
q
OPA4658 LOW-POWER UPGRADE
freedom from amplifier bandwidth interaction. This allows
frequency response peaking elements to be added, multiple
input inverting summing circuits to have greater bandwidth,
and low-power line drivers to meet the demanding require-
ments of studio cameras and broadcast video.
The output capability of the OPA4684 also sets a new mark
in performance for low-power current-feedback amplifiers.
Delivering a full
鹵4Vp-p
swing on
鹵5V
supplies, the OPA4684
also has the output current to support >
鹵3V
swing into 50鈩?
This minimal output headroom requirement is complemented
by a similar 1.2V input stage headroom giving exceptional
capability for single +5V operation.
The OPA4684鈥檚 low 6.8mA supply current is precisely trimmed
at 25擄C. This trim, along with low shift over temperature and
supply voltage, gives a very robust design over a wide range
of operating conditions.
DESCRIPTION
The OPA4684 provides a new level of performance in low-
power, wideband, current-feedback (CFB) amplifiers. This
CFB
PLUS
amplifier is among the first to use an internally
closed-loop input buffer stage that enhances performance
significantly over earlier low-power CFB amplifiers. While
retaining the benefits of very low power operation, this new
architecture provides many of the benefits of a more ideal
CFB amplifier. The closed-loop input stage buffer gives a
very low and linearized impedance path at the inverting input
to sense the feedback error current. This improved inverting
input impedance retains exceptional bandwidth to much
higher gains and improves harmonic distortion over earlier
solutions limited by inverting input linearity. Beyond simple
high-gain applications, the OPA4684 CFB
PLUS
amplifier per-
mits the gain setting element to be set with considerable
BW (MHz) vs GAIN
V+
1 of 4 Channels
6
Normalized Gain (3dB/div)
3
0
鈥?
鈥?
鈥?
鈥?2
鈥?5
鈥?8
鈥?1
R
F
= 800鈩?/div>
鈥?4
10
MHz
G = 10
G = 20
G = 50
G = 100
G=5
G=1
G=2
+
V
O
V鈥?/div>
I
ERR
R
F
Z
(S)
I
ERR
R
G
Low-Power
Amplifier
100
200
Patent Pending
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.
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.
Copyright 漏 2002, Texas Instruments Incorporated
www.ti.com

OPA4684ID 產(chǎn)品屬性

  • 50

  • 集成電路 (IC)

  • Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

  • -

  • 電流反饋

  • 4

  • -

  • 780 V/µs

  • 1.9GHz

  • 250MHz

  • 5µA

  • 1500µV

  • 1.7mA

  • 160mA

  • 5 V ~ 12 V，±2.5 V ~ 6 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 14-SOIC（0.154"，3.90mm 寬）

  • 14-SOIC

  • 管件

  • 296-13648-5

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