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PDF OPA628 Data sheet ( Hoja de datos )
| Número de pieza | OPA628 | |
| Descripción | Low Distortion Wideband OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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®
OPA628
OPA628
Low Distortion Wideband
OPERATIONAL AMPLIFIER
FEATURES
q EXCELLENT DIFFERENTIAL GAIN: 0.015%
q EXCELLENT DIFFERENTIAL PHASE: 0.015°
q LOW DISTORTION: 90dB SFDR
q TWO-TONE THIRD-ORDER INTERCEPT:
60dBm
q LOW NOISE: 2.5nV/√Hz
q LOW NOISE FIGURE: 9dB
q BANDWIDTH (Gain = +1): 160MHz
q 0.1dB GAIN FLATNESS: 30MHz
q LOW OFFSET VOLTAGE: 500µV
APPLICATIONS
q BROADCAST QUALITY VIDEO
q MEDICAL IMAGING
q LOW NOISE PREAMPLIFIER
q PRECISION ADC/DAC BUFFER
q TELECOMMUNICATIONS
q ANALYTICAL INSTRUMENTS
q ACTIVE FILTERS
q DC RESTORATION CIRCUITS
DESCRIPTION
The OPA628 is a low distortion, wideband operational
amplifier. It features low differential gain error of
0.015% and low differential phase error of 0.015° at
NTSC and PAL frequencies with a 150Ω load (a back-
terminated 75Ω cable). The 0.1dB gain flatness to
30MHz, and the excellent differential gain and phase
make the OPA628 ideal for broadcast quality video
applications. In addition, the spurious free dynamic
range of 90dB makes the OPA628 an excellent choice
to buffer the input of precision Analog-to-Digital con-
verters. It can also be used to provide a buffer for the
output of precision high speed Digital-to-Analog con-
verters. The two-tone third-order intercept of the
OPA628 is 60dBm.
The OPA628 is a unity gain stable, voltage feedback
operational amplifier. It has all of the benefits asso-
ciated with voltage feedback amplifiers including
high input impedance, high common mode rejection,
and symmetrical differential input flexibility. The
unity gain bandwidth of the OPA628 is 160MHz. The
low noise of 2.5nV/√Hz and low noise figure of 9dB
(RS = 50Ω) make the OPA628 very useful in preci-
sion applications requiring wide dynamic range.
additionally enhanced by separating the power sup-
plies to the input and output stages requiring four
power supply connections as shown in the block
diagram below. This separation of supplies eliminates
the effects of package and wire bond parasitic capaci-
tance and inductance. The OPA628 is powered with
±5VDC supplies for low power dissipation. The
OPA628 is available in 8-pin SOIC package. The
temperature range is –40°C to +85°C.
+VCC, Input Stage
8
Active
Load
+VCC, Output Stage
7
Non-Inverting
Input
3
6
+1
Output
2
Inverting
Input
The superior distortion performance of the OPA628 is
achieved by its multistage architecture which provides
high open-loop gain. The distortion performance is
5
4
–VCC, Input Stage
–VCC, Output Stage
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1993 Burr-Brown Corporation
PDS-1204B
OPA628Printed in U.S.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At VCC = ±5VDC, RL=100Ω, G = +2, and TA = +25°C, unless otherwise noted.
5MHz HARMONIC DISTORTION vs OUTPUT SWING
–70
G = +2V/V
–75
–80
–85
2f
–90
–95
–100
0
3f
0.5 1.0 1.5 2.0 2.5 3.0
Output Swing (Vp-p)
5MHz HARMONIC DISTORTION vs LOAD RESISTANCE
–70
G = +2V/V
–75 VO = 2Vp-p
–80
2f
–85
–90
–95
3f
–100
0
100 200 300 400 500 600 700 800 900 1000
Load Resistance (Ω)
10MHz HARMONIC DISTORTION
vs LOAD RESISTANCE
–65
–70 2f
G = +2V/V
VO = 2Vp-p
–75
–80
–85
–90
3f
–95
0
100 200 300 400 500 600 700 800 900 1000
Load Resistance (Ω)
FULL-POWER BANDWIDTH vs OUTPUT SWING
1G
G = +1V/V
100M
G = +2V/V
G = +5V/V
10M
01
Slew Rate Limit
Slew Rate Limit
for G = +5V/V
23456
Output Swing (Vp-p)
SETTLING TIME vs CLOSED-LOOP GAIN
100
90
0.01%
80
70
60
50
40 VO = 2V step
30
0.1%
20
10
0
–1 –2 –3 –4
Closed-Loop Gain
–5
SETTLING TIME vs OUTPUT VOLTAGE CHANGE
100
90
80 0.01%
70
60
50
Gain = –1V/V
40
30
20
10
0.1%
0
01234
Output Voltage Change (Vp-p)
5
®
5 OPA628
5 Page 
1 of settling response at b
n+1
50Ω
R2
R1
a
R1
c
50Ω
nR2
nR1
OPA628
FIGURE 5. Settling Time Test Circuit.
2V
G = –n
b
G = n+1
R3
nR3
OPA620
Tektronix11402
50Ω
1MΩ
15pF
Note that the short circuit condition represents the maximum
amount of internal power dissipation that can be generated.
Thus, the “Maximum Power Dissipation” curve starts at
1.2W and is derated based on a 175°C maximum junction
temperature and the junction-to-ambient thermal resistance,
θJA, of the package. The variation of short circuit current
with temperature is shown in Figure 7.
INPUT PROTECTION
Static damage has been well recognized for MOSFET de-
vices, but any semiconductor device deserves protection
from this potentially damaging source. The OPA628 incor-
porates on-chip ESD protection diodes as shown in Figure 8.
This eliminates the need for the user to add external protec-
tion diodes, which can add capacitance and degrade AC
performance.
1.2
+VCC
1.0
0.8
External
Internal
Pin Circuitry
0.6
0.4 –VCC
0.2 FIGURE 8. Internal ESD Protection.
0
0 +25 +50 +75 +100 +125 +150
Ambient Temperature (°C)
FIGURE 6. Maximum Power Dissipation.
200
180
Source
160
140
Sink
120
100
–50
–25
0 25 50 75 100 125
Temperature (°C)
FIGURE 7. Short Circuit Current vs Temperature.
All pins on the OPA628 are internally protected from ESD
by means of a pair of back-to-back reverse-biased diodes to
either power supply as shown. These diodes will begin to
conduct when the input voltage exceeds either power supply
by about 0.7V. This situation can occur with loss of the
amplifier’s power supplies while a signal source is still
present. The diodes can typically withstand a continuous
current of 30mA without destruction. To insure long term
reliability, however, diode current should be externally lim-
ited to approximately 10mA whenever possible.
OFFSET VOLTAGE ADJUSTMENT
The OPA628’s input offset voltage is laser-trimmed and will
require no further adjustment for most applications. How-
ever, if additional adjustment is needed, the circuit in Figure
9 can be used without degrading offset drift with tempera-
ture. Avoid external adjustment whenever possible since
extraneous noise, such as power supply noise, can be inad-
vertently coupled into the amplifier’s inverting input termi-
nal. Remember that additional offset errors can be created by
®
11 OPA628
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OPA628.PDF ] | |
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