廬
APPLICATION BULLETIN
Mailing Address: PO Box 11400 鈥?Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd. 鈥?Tucson, AZ 85706
Tel: (602) 746-1111 鈥?Twx: 910-952-111 鈥?Telex: 066-6491 鈥?FAX (602) 889-1510 鈥?Immediate Product Info: (800) 548-6132
LOW
POWER SUPPLY VOLTAGE OPERATION OF REF102 10.0V
PRECISION VOLTAGE REFERENCE
By R. Mark Stitt (602) 746-7445
Two of the most important specifications for a voltage
reference are noise and stability with time. The zener-based
REF102 10.0V voltage reference has much better noise and
stability than band-gap-based references.
An advantage that band-gap-based references have in some
applications is the ability to operate from lower voltage
power supplies. This is because the basic band gap voltage
is approximately 1.2V as compared to 6V to 8V for a zener
diode. As a 10.0V reference, the REF102 requires a mini-
mum 11.4V V
S
. If the higher performance of a REF102 is
required, there are several options for operation on lower
supply voltages.
If a negative supply is available, it may be possible to
operate the REF102 on a positive supply as low as 4.5V.
Another option is to use one of the simple DC/DC converter
circuits shown to operate the REF102 from a single +5V
power supply.
The simplest option for reduced supply operation of a
REF102 is to add a unity-gain inverter to make a
鹵5.0V
V+
(6.4V min)
2
V+
REF102
+10V 6
Out
+5.0V Out
5
Gnd
4
7
R
2
25k鈩?/div>
R
1
25k鈩?/div>
鈥?.0V Out
6
R
4
100k鈩?/div>
1
7
R
2
100k鈩?/div>
R
1
10k鈩?/div>
reference as shown in Figure 1. This allows the REF102 to
be used on
鹵9V
power supplies, for example. The minimum
voltage for V+ is actually 6.4V (the output of the REF102
can operate within 1.4V of its positive supply).
The minimum negative supply depends on the amplifier
used for the unity-gain inverter. With an INA105 difference
amp used for the unity-gain inverter, the negative power
supply must be at least 鈥?V.
To operate the REF102 on a minimum +V
S
of 4.5V, use an
INA106 gain-of-10 difference amplifier for the inverter as
shown in Figure 2. With the INA106, the reference outputs
are +1.0V and 鈥?.0V. The 4.5V minimum +V
S
rating is due
to the output swing limit of the INA106. The negative
supply must be at least 鈥?2V.
V+
(4.5V min)
2
V+
REF102
+10V 6
Out
+1.0V Out
Gnd
4
鈥?.0V Out
2
5
2
R
3
10k鈩?/div>
INA106
6
4
V鈥?/div>
(鈥?2V min)
3
R
3
25k鈩?/div>
INA105
4
V鈥?/div>
(鈥?V min)
3
1
R
4
25k鈩?/div>
FIGURE 2. +1.0V, 鈥?.0V Reference Using REF102 Can
Operate on +V
S
= +4.5V, 鈥揤
S
= 鈥?2V.
FIGURE 1.
鹵5.0V
Reference Using REF102 Can Operate on
+V
S
= +6.4V, 鈥揤
S
= 鈥?V.
漏
1990 Burr-Brown Corporation
AB-011
Printed in U.S.A. June, 1990
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