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PDF BUF04GS Data sheet ( Hoja de datos )
| Número de pieza | BUF04GS | |
| Descripción | Closed-Loop High Speed Buffer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Bandwidth – 110 MHz
Slew Rate – 3000 V/s
Low Offset Voltage – <1 mV
Very Low Noise – < 4 nV/√Hz
Low Supply Current – 8.5 mA Mux
Wide Supply Range – ؎5 V to ؎15 V
Drives Capacitive Loads
Pin Compatible with BUF03
APPLICATIONS
Instrumentation Buffer
RF Buffer
Line Driver
High Speed Current Source
Op Amp Output Current Booster
High Performance Audio
High Speed AD/DA
Closed-Loop
High Speed Buffer
BUF04*
FUNCTIONAL BLOCK DIAGRAMS
8-Lead Narrow-Body SO
(S Suffix)
Plastic DIP
8-Lead and Cerdip
(P, Z Suffix)
1
BUF04
NULL 1
NC 2
IN 3
V– 4
BUF04
Top View
8 NULL
7 V+
6 OUT
5 NC
NC = NO CONNECT
GENERAL DESCRIPTION
The BUF04 is a wideband, closed-loop buffer that combines
state of the art dynamic performance with excellent dc
performance. This combination enables designers to maximize
system performance without any speed versus dc accuracy
compromises.
Built on a high speed Complementary Bipolar (CB) process for
better power performance ratio, the BUF04 consumes less than
8.5 mA operating from ±5 V or ±15 V supplies. With a 2000 V/µs
min slew rate, and 100 MHz gain bandwidth product, the
BUF04 is ideally suited for use in high speed applications where
low power dissipation is critical.
Full ± 10 V output swing over the extended temperature range
along with outstanding ac performance and high loop gain
accuracy makes the device useful in high speed data acquisition
systems.
High slew rate and very low noise and THD, coupled with wide
input and output dynamic range, make the BUF04 an excellent
choice for video and high performance audio circuits.
The BUF04’s inherent ability to drive capacitive loads over a
wide voltage and temperature range makes it extremely useful
for a wide variety of applications in military, industrial, and
commercial equipment.
The BUF04 is specified over the extended industrial (–40°C to
+85°C) and military (–55°C to +125°C) temperature range.
BUF04s are available in plastic and ceramic DIP plus SO-8
surface mount packages.
Contact your local sales office for MIL-STD-883 data sheet and
availability.
*Patent pending.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
Typical Performance Characteristics–BUF04
150 200
VS = ±15V
120
315 PLASTIC DIPS
160
TA = +25°C
VS = ±15V
315 CERDIPS
TA = +25°C
90 120
60 80
30 40
0
–0.1 0.0 0.1 0.2 0.3 0.4
OFFSET – mV
0.5 0.6
Figure 1. Input Offset Voltage (VOS) Distribution @
±15 V, P-DIP
125
VS = ±5V
315 PLASTIC DIPS
100
TA = +25°C
75
50
25
0
–0.15 –0.1 –0.5
0
0.5 0.1 0.15 0.2
OFFSET – mV
Figure 4. Input Offset Voltage (VOS) Distribution @
±15 V, Cerdip
125
VS = ±5V
100 315 CERDIPS
TA = +25°C
75
50
25
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OFFSET – mV
Figure 2. Input Offset Voltage (VOS) Distribution @
±5 V, P-DIP
2.0
1.0
0
–1.0
±15V
±5V
–2.0
–3.0
–4.0
–5.0
–6.0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE – °C
Figure 3. Input Offset Voltage (VOS) vs. Temperature
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OFFSET – mV
Figure 5. Input Offset Voltage (VOS) Distribution @
±5 V, Cerdip
0
–1.0
–2.0
VS = ±15V
VS = ±5V
–3.0
–4.0
–5.0
–6.0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE – °C
Figure 6. Input Bias Current vs. Temperature
REV. 0
–5–
5 Page 
BUF04
Output Current Transient Recovery
Settling characteristics of high speed buffers also include the
buffer’s ability to recover, i.e., settle, from a transient output
current load condition. When driving the input of an A/D
converter, especially the successive-approximation converter
types, the buffer must maintain a constant output voltage under
dynamically changing load current conditions. In these types of
converters, the comparison point is usually diode-clamped, but
it may deviate several hundred millivolts resulting in high
frequency modulation of the A/D input current. Open-loop and
closed-loop buffers (also, op amps configured as followers) that
exhibit high closed-loop output impedances and/or low unity
gain crossover frequencies recover very slowly from output load
current transients. This slow recovery leads to linearity errors or
missing codes because of errors in the instantaneous input volt-
age. Therefore, the buffer (or op amp) chosen for this type of
application should exhibit low output impedance and high unity
gain bandwidth so that its output has had a chance to settle to
its nominal value before the converter makes its comparison.
The circuit in Figure 34 illustrates a settling measurement
circuit for evaluating the recovery time of high speed buffers
from an output load current transient. The input to the buffer is
grounded for ease of measuring the recovery time, and two
resistors are used to sum steady-state and transient load currents
at the output. As a worst-case condition, R1, was chosen such
that the BUF04 would source (or sink) a steady-state current of
25 mA. R2 was then chosen to add a 10 mA transient current
upon the steady-state value. To set accurately the nodal voltages
internal to the BUF04, the supply voltages were offset by the
voltage applied to R1. Because of its high transimpedance, wide
bandwidth, and low output impedance, the BUF04 exhibits an
extremely fast recovery time of 60 ns to 0.01%, as shown in
Figure 34. Results were identical regardless whether the BUF04
was sourcing or sinking current.
V+
10µF
0.1µF
TP1 TP2
7 R2
3 BUF04 6
250Ω
VIN
0.1µF
4
R1
200Ω
SOURCE: 0 –2.5 V
SINK: 0 +2.5V
10µF VLOAD
SOURCE: –5V
SINK: +5V
V–
Figure 34. Transient Output Load Current Test Circuit
ISOURCE 100
(4mA/DIV) 90
∆t 59.00ns
25mA
35mA
VOUT 10
(5mV/DIV) 0%
100mV
5mV
20ns
Figure 35. BUF04’s Output Load Current Recovery Time
Terminated Line Drivers
The BUF04’s high output current, large slew rate, and wide
bandwidth all combine to make it an ideal device for high speed
line driver applications. As shown in Figure 36, the BUF04 can
be configured for driving doubly terminated 50 Ω and 75 Ω
cables. To optimize the circuit’s pulse response, a capacitor, CT
(CX + CTRIM), is connected across the series back termination.
The BUF04 can drive a 50 Ω line to ± 2.5 V and a 75 Ω line to
± 3.75 V when operating on ± 15 V supplies.
CT
CX
6'
VIN
3 BUF04 6
RX
COAX
RS RL
ZO COAX RS, RL RX
50Ω RG-58 50Ω 50
75Ω RG-59 75Ω 75
CX
91pF
62pF
CT
3–15pF
3–15pF
Figure 36. Line Driver Configuration
Low-Pass Active Filter
In many signal-conditioning applications, filters are required to
band-limit noise or altogether eliminate other unwanted signals
prior to conversion. Often, high frequency filters are needed for
these applications; however, there are few op amps that exhibit
the high open-loop gain and wide unity-gain crossover
frequency required for these applications. As illustrated in
Figure 37, the BUF04 and a handful of passive components can
be configured as a high frequency, low-pass active filter. Since
the filter configuration is a unity-gain Sallen-Key topology, the
BUF04 is particularly well suited for this application. In this
circuit, an additional resistor, R3, was added to prevent
interaction between C2 and the BUF04’s input capacitance.
C1*
44pF (22pF x 2)
R1
VIN 499Ω
R2
499Ω
C2*
22pF
R3
47Ω 3
6
BUF04
VOUT
* SILVERED MICA OR
DIPPED CERAMIC
1
WO = R1 · R2 · C1 · C2 ; Q =
C1
4 · C2
Figure 37. A 10 MHz Low-Pass Active Filter
REV. 0
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BUF04GS.PDF ] | |
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