Switchcraft 12B

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

SCHEMATIC DIAGRAM
PRECISION 1.25 VOLT
MICROPOWER VOLTAGE REFERENCE
ISSUE 2 - FEBRUARY 1997
ZRA125
V
R
G
nd
DEVICE DESCRIPTION
The ZRA125 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 1.25 volts. The device is available
in small outline surface mount packages, ideal
for applications where space saving is
important, as well as packages for through hole
requirements.
The ZRA125 design provides a stable voltage
without an external capacitor and is stable with
capacitive loads. The ZRA125 is recommended
for operation between 50µA and 5mA and so
is ideally suited to low power and battery
powered applications.
Excellent performance is maintained to a
suggested absolute maximum of 25mA,
however the rugged design and 20 volt
processing allows the reference to withstand
transient effects and currents up to 200mA.
Superior switching capability allows the device
to reach stable operating conditions in only a
few microseconds.
FEATURES
Small outline SOT23, SO8 and TO92 style
packages
No stabilising capacitor required
Typical T
C
30ppm/°C
Typical slope resistance 0.65
± 3%,2% and 1% tolerance
Industrial temperature range
Operating current 50µA to 5mA
Transient response, stable in less than 10µs
Optional extended current range
APPLICATIONS
Battery powered and portable equipment.
Metering and measurement systems.
Instrumentation.
Data acquisition systems.
Precision power supplies.
Test equipment.
1 - 24
ABSOLUTE MAXIMUM RATING
Reverse Current 25mA
Forward Current 25mA
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23 330mW
E-Line, 3 pin (TO92) 500mW
E-Line, 2 pin (TO92) 500mW
SO8 625mW
TYPICAL CHARACTERISTICS
Forward Characteristics
Forward Current (mA)
Temperature (°C)
Reference Current (mA)
Frequency (kHz)
Temperature Drift
Slope Resistance v Current
V
-
(V
)
V
- (V
)
Forw
a
rd
V
olta
ge
(
V
)
Sl
ope
res
istance
(
)
Time (µs)
Transient Response (I =150
µµ
A)
Slope Resistance v Frequency
µ
Time (µs)
Transient Response (I =5mA)
µ
R
ef
er
ence
voltage (V
)
S
lope
res
i
st
ance
(
)
V
- (V
)
V
-
(V
)
Reverse Characteristics
Reverse Voltage (V)
Reve
rs
e
C
ur
re
nt
(
µ
A)
ZRA125
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS LIMITS TOL.
%
UNITS
MIN TYP MAX
V
R
Reverse Breakdown Voltage
I
R
=150µA
1.228
1.225
1.21
1.24
1.25
1.25
1.252
1.275
1.29
1
2
3
V
I
MIN
Minimum Operating Current 30 50
µA
I
R
Recommended Operating
Current
0.05 5 mA
T
C
Average Reverse
Breakdown Voltage Temp.
Co.
I
R(min)
to
I
R(max)
30 90 ppm/°C
R
S
§ Slope Resistance 0.65 2
Z
R
Reverse Dynamic Impedance
I
R
=1mA
f = 100Hz
I
AC
= 0.1 I
R
0.5 1
E
N
Wideband Noise Voltage
I
R
=150µA
f=100Hz to
10kHZ
40
µV(rms)
T
C
=
V
R
Change x 1000000
V
R
x Temperature Change
§ R
S
=
V
R
Change (I
R
(min) to I
R
(max))
I
R
(max) I
R
(min)
ZRA125
1 - 261 - 45
ABSOLUTE MAXIMUM RATING
Reverse Current 25mA
Forward Current 25mA
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23 330mW
E-Line, 3 pin (TO92) 500mW
E-Line, 2 pin (TO92) 500mW
SO8 625mW
TYPICAL CHARACTERISTICS
Forward Characteristics
Forward Current (mA)
Temperature (°C)
Reference Current (mA)
Frequency (kHz)
Temperature Drift
Slope Resistance v Current
V
-
(V
)
V
- (V
)
Forw
a
rd
V
olta
ge
(
V
)
Sl
ope
res
istance
(
)
Time (µs)
Transient Response (I =150
µµ
A)
Slope Resistance v Frequency
µ
Time (µs)
Transient Response (I =5mA)
µ
R
ef
er
ence
voltage (V
)
S
lope
res
i
st
ance
(
)
V
- (V
)
V
-
(V
)
Reverse Characteristics
Reverse Voltage (V)
Reve
rs
e
C
ur
re
nt
(
µ
A)
ZRA125
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS LIMITS TOL.
%
UNITS
MIN TYP MAX
V
R
Reverse Breakdown Voltage
I
R
=150µA
1.228
1.225
1.21
1.24
1.25
1.25
1.252
1.275
1.29
1
2
3
V
I
MIN
Minimum Operating Current 30 50
µA
I
R
Recommended Operating
Current
0.05 5 mA
T
C
Average Reverse
Breakdown Voltage Temp.
Co.
I
R(min)
to
I
R(max)
30 90 ppm/°C
R
S
§ Slope Resistance 0.65 2
Z
R
Reverse Dynamic Impedance
I
R
=1mA
f = 100Hz
I
AC
= 0.1 I
R
0.5 1
E
N
Wideband Noise Voltage
I
R
=150µA
f=100Hz to
10kHZ
40
µV(rms)
T
C
=
V
R
Change x 1000000
V
R
x Temperature Change
§ R
S
=
V
R
Change (I
R
(min) to I
R
(max))
I
R
(max) I
R
(min)
ZRA125
1 - 261 - 45
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