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PDF REF200 Data sheet ( Hoja de datos )
| Número de pieza | REF200 | |
| Descripción | DUAL CURRENT SOURCE/CURRENT SINK | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
REF200
REF200
REF200
DUAL CURRENT SOURCE/CURRENT SINK
FEATURES
q COMPLETELY FLOATING:
No Power Supply or Ground Connections
q HIGH ACCURACY: 100µA ±0.5%
q LOW TEMPERATURE COEFFICIENT:
±25ppm/°C
q WIDE VOLTAGE COMPLIANCE:
2.5V to 40V
q ALSO INCLUDES CURRENT MIRROR
APPLICATIONS
q SENSOR EXCITATION
q BIASING CIRCUITRY
q OFFSETTING CURRENT LOOPS
q LOW VOLTAGE REFERENCES
q CHARGE-PUMP CIRCUITRY
q HYBRID MICROCIRCUITS
DESCRIPTION
The REF200 combines three circuit building-blocks
on a single monolithic chip—two 100µA current
sources and a current mirror. The sections are
dielectrically isolated, making them completely
independent. Also, since the current sources are two-
terminal devices, they can be used equally well as
current sinks. The performance of each section is
individually measured and laser-trimmed to achieve
high accuracy at low cost.
The sections can be pin-strapped for currents of 50µA,
100µA, 200µA, 300µA or 400µA. External circuitry
can be used to obtain virtually any current. These and
many other circuit techniques are shown in the
Applications section of this Data Sheet.
The REF200 is available in plastic 8-pin mini-DIP
and SOIC packages.
I1
High
8
I2
High
7
Substrate
6
Mirror
In
5
100µA
100µA
1234
I1
I2
Mirror
Mirror
Low Low Common Out
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
© 1988 Burr-Brown Corporation
PDS-851D
Printed in U.S.A. October, 1993
1 page  
APPLICATIONS INFORMATION
The three circuit sections of the REF200 are electrically
isolated from one another using a dielectrically isolated
fabrication process. A substrate connection is provided (pin
6), which is isolated from all circuitry. This pin should be
connected to a defined circuit potential to assure rated DC
performance. The preferred connection is to the most nega-
tive constant potential in your system. In most analog
systems this would be –V . For best AC performance, leave
S
pin 6 open and leave unused sections unconnected.
Drift performance is specified by the “box method,” as
illustrated in the Current vs Temperature plot of the typical
performance curves. The upper and lower current extremes
measured over temperature define the top and bottom of the
box. The sides are determined by the specified temperature
range of the device. The drift of the unit is the slope of the
diagonal—typically 25ppm/°C from –25°C to +85°C.
If the current sources are subjected to reverse voltage, a
protection diode may be required. A reverse voltage circuit
model of the REF200 is shown in the Reverse Current vs
Reverse Voltage curve. If reverse voltage is limited to less
than 6V or reverse current is limited to less than 350µA, no
protection circuitry is required. A parallel diode (Figure 2a)
will protect the device by limiting the reverse voltage across
the current source to approximately 0.7V. In some applica-
tions, a series diode may be preferable (Figure 2b) because
it allows no reverse current. This will, however, reduce the
compliance voltage range by one diode drop.
Applications for the REF200 are limitless. Application Bul-
letin AB-165 shows additional REF200 circuits as well as
other related current source techniques. A collection of
circuits is shown to illustrate some techniques. Also, see
AB-165A.
8,7 5 4
5kΩ
1kΩ 1kΩ
8X
4kΩ
1,2
3
Current
Mirror
(Substrate)
Current
Source
(1 of 2)
12kΩ
6
FIGURE 1. Simplified Circuit Diagram.
D1 D3
100µA
Bidirectional
Current Source
D4
(a) (b)
FIGURE 2. Reverse Voltage Protection.
D2
(c)
NOTE: All diodes = 1N4148.
100µA
D1
Bidirectional
Current Source
100µA
D2
(d)
®
5 REF200
5 Page 
VIN
–10V ≤ VIN ≤ +10V
1/4
OPA404
100kΩ
100µA + Bridge
(See Figure 12)
1/4
OPA404
C
1/4
OPA404
VIN = +10V: 100% Duty Cycle
VIN = 0V: 50% Duty Cycle
VIN = –10V: 0% Duty Cycle
100µA + Bridge
(See Figure 12)
FIGURE 13. Precision Duty-Cycle Modulator.
60kΩ
12Vp-p
Duty Cycle Out
For current source,
invert circuitry and
use P-Channel FET.
IOUT
Siliconix
J109
0.1µF 50kΩ
0.1µF
50kΩ
IOUT
Siliconix
J109
For current source,
invert circuitry and
use P-Channel FET.
0.1µF 50kΩ
100µA
–15V
FIGURE 14. Low Noise Current Sink.
100µA
100µA
–15V
FIGURE 15. Low Noise Current Sink with Compliance
Below Ground.
®
11 REF200
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet REF200.PDF ] | |
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