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PDF OPA640 Data sheet ( Hoja de datos )
| Número de pieza | OPA640 | |
| Descripción | Wideband Voltage Feedback OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA640 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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® OPA640
OPA640
OPA640
Wideband Voltage Feedback
OPERATIONAL AMPLIFIER
FEATURES
q UNITY-GAIN BANDWIDTH: 1.3GHz
q UNITY-GAIN STABLE
q LOW NOISE: 2.9nV/√Hz
q LOW HARMONICS: –75dBc at 10MHz
q HIGH COMMON MODE REJECTION: 85dB
q HIGH SLEW RATE: 350V/µs
DESCRIPTION
The OPA640 is an extremely wideband operational
amplifier featuring low noise, high common-mode
rejection and high spurious free dynamic range.
The OPA640 is internally compensated for unity-gain
stability. This amplifier has a fully symmetrical differ-
ential input due to its “classical” operational amplifier
APPLICATIONS
q COMMUNICATIONS
q MEDICAL IMAGING
q TEST EQUIPMENT
q CCD IMAGING
q ADC/DAC GAIN AMPLIFIER
q HIGH-RESOLUTION VIDEO
q LOW NOISE PREAMPLIFIER
q DIFFERENTIAL AMPLIFIER
q ACTIVE FILTERS
circuit architecture. This allows the OPA640 to be used
in all op amp applications requiring high speed and
precision.
Low noise, wide bandwidth, and high linearity make
this amplifier suitable for a variety of RF and video
applications.
+VS
7, 8
Non-Inverting 3
Input
Inverting
Input
2
Current
Mirror
Output
Stage
6
VOUT
CC
4, 5
–VS
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-11179D
OPA640Printed in U.S.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, VS = ±5V, RL = 100Ω, CL = 2pF, RFB = 402Ω and all four power supply pins are used, unless otherwise noted. RFB = 25Ω for a gain of +1.
RECOMMENDED ISOLATION RESISTANCE
vs CAPACITIVE LOAD FOR G = +1
40
30
20
10
0
0 10 20 30 40 50 60 70
Capacitive Load (pF)
200
160
120
80
40
0
–40
–80
–120
–160
–200
SMALL SIGNAL TRANSIENT RESPONSE
(G = +1, RL = 100Ω)
Time (5ns/Div)
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
–1V
LARGE SIGNAL TRANSIENT RESPONSE
(G = +1, RL = 100Ω)
Time (5ns/Div)
G = +1V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
9
6
Gain
3
DIP
Bandwidth
= 1.05GHz
0 SO-8
–3 Bandwidth 0
= 1.45GHz
–6 –45
–9 SO-8
–12
Closed-Loop
Phase
–15
–40°C SO-8
Bandwidth
= 1.71GHz
–90
–135
–180
–18 –225
–21
10M
100M
1G
Frequency (Hz)
–270
10G
G = +2V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
9 Gain
6
3
0
–3 Closed-Loop
Phase
–6
DIP
Bandwidth
= 262MHz
1M 10M 100M
Frequency (Hz)
SO-8
Bandwidth
= 286MHz
0
–45
–90
–135
–180
–225
–270
1G
AV = +5V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
17 Gain
14
11
8
5 Closed-Loop
Phase
2
–1
–4
Bandwidth
= 68MHz
1M 10M 100M
Frequency (Hz)
0
–45
–90
1G
®
5 OPA640
5 Page 
DISTORTION
The OPA640’s Harmonic Distortion characteristics vs fre-
quency and power output are shown in the Typical Perfor-
mance Curves. Distortion can be further improved by in-
creasing the load resistance. Refer to Figure 6. Remember to
include the contribution of the feedback resistance when
calculating the effective load resistance seen by the ampli-
fier.
–70
–80
2fO
–90 3fO
–100
10
20
50 100 200
Load Resistance (Ω)
500 1k
NOTE: Feedback Resistance used was 402Ω.
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance.
The third-order intercept point is an important parameter for
many RF amplifier applications. Figure 7 shows the
OPA640’s single tone, third-order intercept vs frequency.
This curve is particularly useful for determining the magni-
tude of the third harmonic as a function of frequency, load
resistance, and gain. For example, assume that the applica-
tion requires the OPA640 to operate in a gain of +1V/V and
drive 2Vp-p into 50Ω at a frequency of 10MHz. Referring to
Figure 11 we find that the intercept point is +47dBm. The
magnitude of the third harmonic can now be easily calcu-
lated from the expression:
Third Harmonic (dBc) = 2(OPI3P – PO)
where OPI3P = third-order intercept, dBm
PO = output level, dBm
For this case OPI3P = 47dBm, P = 47dBm, and the third
O
Harmonic = 2(47 – 10) = 74dB below the fundamental tone.
The OPA640’s low distortion makes the device an excellent
choice for a variety of RF signal processing applications.
The value for the two-tone, third-order intercept is typically
8dB lower than the single tone value.
+60
+50
+40
+30
+20
1M
10M
Frequency (Hz)
100M
FIGURE 7. Single-Tone , 3rd-Order Intercept Point vs Fre-
quency.
NOISE FIGURE
The OPA640 voltage and current noise spectral densities are
specified in the Typical Performance Curves. For RF appli-
cations, however, Noise Figure (NF) is often the preferred
noise specification since it allows system noise performance
to be more easily calculated. The OPA640’s Noise Figure vs
Source Resistance is shown in Figure 8.
25
20
15
10
5
0
10
NF = 10 LOG 1 + en2 + (InRS)2
4KTRS
100 1k 10k
Source Resistance (Ω)
100k
FIGURE 8. Noise Figure vs Source Resistance.
®
11 OPA640
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OPA640.PDF ] | |
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