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PDF OPA2662 Data sheet ( Hoja de datos )
| Número de pieza | OPA2662 | |
| Descripción | Dual / Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA2662 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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OPA2662
OPA2662
OPA2662
Dual, Wide Bandwidth
OPERATIONAL TRANSCONDUCTANCE AMPLIFIER
FEATURES
q 370MHz BANDWIDTH
q 58mA/ns SLEW RATE
q HIGH OUTPUT CURRENT: ±75mA
q 400Mbit/s DATA RATE
q VOLTAGE-CONTROLLED CURRENT
SOURCE
q ENABLE/DISABLE FUNCTION
APPLICATIONS
q HEAD DRIVE AMPLIFIER FOR ANALOG/
DIGITAL VIDEO TAPES AND DATA RE-
CORDERS
q LED AND LASER DIODE DRIVER
q HIGH CURRENT VIDEO BUFFER OR LINE
DRIVER
q RF OUTPUT STAGE DRIVER
q HIGH DENSITY DISK DRIVES
+VCCOUT
(16)
B
(2,7)
EN
(3, 6)
+1
E
(10,15)
C
(11,14)
(9)
–VCCOUT
1/2 OPA2662
DESCRIPTION
The OPA2662 is a versatile driver device for ultra
wide-bandwidth systems, including high-resolution
video, RF and IF circuitry, communications and test
equipment. The OPA2662 includes two power volt-
age-controlled current sources, or operational
transconductance amplifiers (OTAs), in a 16-pin DIP
or SOL-16 package and is specified for the extended
industrial temperature range (–40°C to +85°C). The
output current is zero-for-zero differential input volt-
age. The OTAs provide a 250MHz large-signal band-
width, a 58mA/ns slew rate, and each current source
delivers up to ±75mA output current.
The transconductance of both OTAs can be adjusted
between pin 5 and –VCC by an external resistor,
allowing bandwidth, quiescent current, harmonic dis-
tortion and gain trade-offs to be optimized. The out-
put current can be set with a degeneration resistor
between the emitter and GND. The current mirror
ratio between the collector and emitter currents is
fixed to three. Switching stages compatible to logic
TTL levels make it possible to turn each OTA sepa-
rately on within 30ns and off within 200ns at full
power.
I (mA)
80
70
IC
60
50
40
30
20 IE
–1 –0.8 –0.6 –0.4
0.2 0.4 0.6 0.8
–10
1 VIN (V)
–20
–30
–40
–50
–60
–70
OTA Transfer
–80 Characteristics
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
©1991 Burr-Brown Corporation
PDS-1129D
Printed in U.S.A. August, 1994
1 page  
TYPICAL PERFORMANCE CURVES
At VCC = ±5V, RQ = 750Ω, and TA = +25°C, unless otherwise specified.
15
14
13
12
11
10
9
8
–50
OTA B TO E-INPUT OFFSET VOLTAGE
vs TEMPERATURE
RE = 50kΩ
RC = 40Ω
–25 0
25 50 75 100
Temperature (°C)
18
16
14
12
10
8
6
4
2
0
7
OTA B-INPUT RESISTANCE
vs TOTAL QUIESCENT CURRENT
12 17 22 27 32 37 42 47
Total Quiescent Current, IQ (±mA)
OTA C-OUTPUT BIAS CURRENT vs TEMPERAURE
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
–50
–25
0 25 50
Temperature (°C)
75 100
50
45
40
35
30
25
20
15
10
5
0
7
OTA E-OUTPUT RESISTANCE
vs TOTAL QUIESCENT CURRENT
12 17 22 27 32 37 42
Total Quiescent Current, IQ (±mA)
47
OTA B-INPUT BIAS CURRENT vs TEMPERATURE
1.5
1.3
1.1
0.9
0.7
–50
–25
0 25 50
Temperature (C°)
75 100
OTA C-OUTPUT RESISTANCE
vs TOTAL QUIESCENT CURRENT
9
8
7
6
5
4
3
2
1
0
7 12 17 22 27 32 37 42 47
Total Quiescent Current, IQ (±mA)
5 OPA2662
5 Page 
to reduce the effect that offset voltages and currents might
otherwise have on the DC operating point of the OTA. The
E degeneration resistor may be bypassed by a capacitor to
maintain high AC gain. Other cases may require a capacitor
with less value to optimize high-frequency performance.
The transconductance of the OTA with degeneration can be
calculated by:
gm' =
1
1
gm
+R
E
; gm
=
1
r
E
In application circuits, the resistor RE between the E-output
and ground is used to set the OTA transfer characteristic. The
input voltage is transferred with a voltage gain of 1V/V to the
E-output. According to the E-output impedance and the RE
resistor size, a certain current flows to ground. As mentioned
before this current is reflected by the current mirror to the
high impedance collector output by a fixed ratio of three.
Figure 2 and Figure 3 show the OTA transfer characteristic
for a RE = 33Ω and RE = 84Ω, which equal to voltage-to-
current conversion factors (transconductance) of ±75mA/V
and ±25mA/V. The limitation for this transconductance
adjustment is the maximum E-output current of ±25mA. The
achievable transconductance and the corresponding mini-
mum RE versus the input voltage shows Figure 4. The area
left to the RE + rE curve can be used and results in a
transconductance below the gm’ curve. The variation of rE vs
total quiescent current is shown in the typical performance
curve section.
IC
≈
3•
V IN
rE + RE
;
RE
≈
3 • VIN
IC
–
rE
IC
C
B
rE
E
IE
RE
33Ω
I (mA)
70
60
50
40
30
20
IC
IE
–1.25 –1 –0.75 –0.5
0.25 0.5 0.75 1 1.25 VIN (V)
–10
–20
–30
–40
–50
–60 ICIC 3≈ •3IE• IE
–70 rErEvavraierisevssvIsQIQ
IQIQ==±1±71m7mA A
FIGURE 2. OTA Transfer Characteristic, RE = 33Ω.
IC
C
B
rE
E
IE
RE
84Ω
–3 –2.5 –2 –1.5 –1
I (mA)
70
60
50
40
30
20
IC
IE
0.5 1 1.5 2 2.5 3 VIN (V)
–10
–20
–30
–40
–50
–60 IC 3 • IE
–70 rE varies vs IQ
IQ = ±17mA
FIGURE 3. OTA Transfer Characteristic, RE = 84Ω.
160
140
120
100
80
60
40
20
0
0
IE MAX = 25mA
160
140
RE + rE
(IC = ±37.5mA)
RE + rE
(IC = ±75mA)
gm' (IC = ±75mA)
120
100
80
60
40
gm' (IC = ±37.5mA)
±0.5 ±1 ±1.5 ±2 ±2.5 ±3
Maximum Input Voltage (V)
±3.5
20
0
±4
FIGURE 4. RE + rE Selection Curve.
DISTORTION
The OPA2662’s harmonic distortion characteristics into a
50Ω load are shown vs frequency in the typical performance
curves for a total quiescent current of ±17mA for both
OTAs, which equals to ±8.5mA for each of them.
The harmonic distortion performance is greatly affected by
the applied quiescent current. In order to demonstrate this
behavior Figure 5 illustrates the harmonic distortion perfor-
mance vs frequency for a low quiescent current of ±8mA,
for a medium of ±17mA and for a high of ±34mA. It can be
seen that the harmonic distortion decreases with all increas-
ing quiescent current.
The same effect is expressed in other ways by the OTA
transfer characteristics for different IQs in the typical perfor-
mance curves.
11 OPA2662
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet OPA2662.PDF ] | |
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