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Teilenummer | REF200AU |
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Beschreibung | DUAL CURRENT SOURCE/CURRENT SINK | |
Hersteller | Burr-Brown Corporation | |
Logo | ||
Gesamt 15 Seiten ®
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
FIGURE 3. 50µA Current Source.
+VS
100µA
IOUT
54
In Out
Mirror
Com
3
50µA
100µA
–VS
200µA
100µA
100µA
300µA
100µA
100µA
400µA
100µA
100µA
54
In Out
Mirror
Com
3
Compliance = 4V
(a) (b)
FIGURE 4. 200µA, 300µA, and 400µA Floating Current Sources.
54
In Out
Mirror
Com
3
Compliance = 4V
(c)
Compliance to
Ground
50µA
54
In Out
Mirror
Com
3
100µA
0.01µF
–VS
(a)
FIGURE 5. 50µA Current Sinks.
®
REF200
+VS
100µA
Compliance to
–VS + 5V
50µA
54
In Out
Mirror
Com
3
100kΩ
100µA
5.1V
1N4689
–VS
(b)
+VS
27kΩ
Compliance to
–VS + 5.1V
50µA
54
In Out
Mirror
Com
3
100µA
–VS
(c)
6
6 Page 100µA
High
300µA
20kΩ
0.01µF
100µA
100µA
High
400µA
20kΩ
0.01µF
2N5116
2N4340
0.01µF
27kΩ
54
In Out
Mirror
Com
3
300µA
Low
100µA
(a) Regulation (15V to 30V = 0.00003%/V (10GΩ)
2N5116
2N4340
54
In Out
Mirror
Com
3
400µA
Low
(a) Regulation (15V to 30V = 0.000025%/V (10GΩ)
FIGURE 16. Floating 300µA and 400µA Cascoded Current Sources.
+VS
100µA
10kΩ
C
10kΩ
VI
OPA602
VO = –VI
Diodes: 1N4148
or PWS740-3
Diode Bridge for
reduced VOS .
100µA
–VS
VO Rate Limit = 100µA/C
FIGURE 17. Rate Limiter.
High
Compliance
4V to 30V
25mA
100Ω
100µA
100Ω
+VS
–VS 100Ω
100Ω
10kΩ
Low
40.2Ω
NOTE: Each amplifier 1/4 LM324.
Op amp power supplies are derived
within the circuitry, and this quiescent
current is included in the 25mA.
FIGURE 18. 25mA Floating Current Source.
®
REF200
12
12 Page | ||
Seiten | Gesamt 15 Seiten | |
PDF Download | [ REF200AU Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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