1.2V and 2.5V Micropower
VOLTAGE REFERENCE
FEATURES
●INITIAL ACCURACY:
REF1004-1.2 ±4mV
REF1004-2.5 ±20mV
●MINIMUM OPERATING CURRENT:
REF1004-1.2 10µA
REF1004-2.5 20µA
●EXCELLENT LONG TERM
TEMPERATURE STABILITY
●VERY LOW DYNAMIC IMPEDANCE
●OPERATES UP TO 20mA
●PACKAGE: 8-Lead SOIC
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
REF1004
NC
NC
NC
Anode
Cathode
NC
Cathode
NC
1
2
3
4
8
7
6
5
Typical Operating Circuit
(Top View)
APPLICATIONS
●BATTERY POWERED TEST EQUIPMENT
●PORTABLE MEDICAL INSTRUMENTATION
●PORTABLE COMMUNICATIONS DEVICES
●A/D AND D/A CONVERTERS
●NOTEBOOK AND PALMTOP COMPUTERS
DESCRIPTION
The REF1004-1.2 and REF1004-2.5 are two terminal
bandgap reference diodes designed for high accuracy
with outstanding temperature characteristics at low
operating currents. Prior to the introduction of the
REF1004 Micropower Voltage References, accuracy
and stability specifications could only be attained by
expensive screening of standard devices. The REF1004
is a cost effective solution when reference voltage
accuracy, low power, and long term temperature sta-
bility are required.
REF1004 is a drop-in replacement for the LT1004 as
well as an upgraded replacement of the LM185/385
series references. The REF1004C is characterized for
operation from 0°C to 70°C and the REF1004I is
characterized for operation from –40°C to +85°C.
The REF1004 is offered in an 8-lead Plastic SOIC
package and shipped in anti-static rails or tape and
reel.
©1992 Burr-Brown Corporation PDS-1172 Printed in U.S.A. October, 1993
2
®
REF1004
REF1004-1.2 REF1004-2.5
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
REFERENCE VOLTAGE IR = 100µA 1.231 1.235 1.239 2.490 2.500 2.511 V
REF1004C(1) 1.229 1.235 1.239 2.487 2.500 2.511
REF1004I(2) 1.225 1.235 1.239 2.480 2.500 2.511
AVERAGE TEMPERATURE
COEFFICIENT IMIN ≤ IR ≤ 20mA 20 20 ppm/°C
MINIMUM OPERATION
CURRENT(3) 810 1220 µA
REVERSE BREAKDOWN IMIN ≤ IR ≤ 1mA 1 1 mV
VOLTAGE CHANGE WITH 1.5(3) 1.5(3)
CURRENT 1mA ≤ IR ≤ 20mA 10 10
20(3) 20(3)
REVERSE DYNAMIC
IMPEDANCE(3) IR = 100µA 0.2 0.6 0.2 0.6 Ω
WIDE BAND NOISE (RMS) IR = 100µA
10Hz ≤ IR ≤ 10kHz 60 120 µV
LONG TERM STABILITY IR = 100µA
TA = 25°C ± 0.1°C 20 20 ppm/KHr
NOTES: (1) This specification applies over the full operating temperature range of 0°C ≤ TA ≤ 70°C. (2) This specification applies over the full operating
temperature range of 40°C ≤ TA ≤ +85°C. (3) Denotes the specifications which apply over the full operating temperature range.
SPECIFICATIONS
ELECTRICAL
TA = +25°C unless otherwise noted.
MODEL TAVZPACKAGE
REF1004C-1.2 0°C to +70°C 1.2V 8-Lead SOIC
REF1004C-2.5 0°C to +70°C 2.5V 8-Lead SOIC
REF1004I-1.2 –40°C to +85°C 1.2V 8-Lead SOIC
REF1004I-2.5 –40°C to +85°C 2.5V 8-Lead SOIC
NOTE: Available in Tape and Reel, Add –TR to Model Number.
ORDERING INFORMATION
Reverse Breakdown Current ........................................................... 30mA
Forward Current................................................................................ 10mA
Operating Temperature Range
REF1004C ........................................................................ 0°C to +70°C
REF1004I...................................................................... –40°C to +85°C
Storage Temperature
REF1004C .................................................................. –65°C to +150°C
REF1004I.................................................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
ABSOLUTE MAXIMUM RATINGS
MODEL PART MARKING
REF1004C-1.2 BBREF0412
REF1004C-2.5 BBREF0425
REF1004I-1.2 BBREF0412
REF1004I-2.5 BBREF0425
ORDERING INFORMATION
PACKAGE INFORMATION
PACKAGE DRAWING
MODEL PACKAGE NUMBER(1)
REF1004C-1.2 8-Pin SOIC 182
REF1004C-2.5 8-Pin SOIC 182
REF1004I-1.2 8-Pin SOIC 182
REF1004I-2.5 8-Pin SOIC 182
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3REF1004
TYPICAL PERFORMANCE CURVES 1.2V
TA = +25°C unless otherwise noted.
REVERSE CHARACTERISTICS
Reverse Voltage (V)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Reverse Current (µA)
100
10
1
0.1
–40°C ≤ T
A
≤ +85°C
Temperature (°C)
–55 –35 –15 5 25 45 65 85 105 125
1.245
1.240
1.235
1.230
1.225
Reverse Voltage (V)
TEMPERATURE DRIFT
REVERSE DYNAMIC IMPEDANCE
Reverse Current (mA)
0.01 0.1 1 10 100
100
10
1
0.1
Reverse Impedance (Ω)
f = 25Hz
–40°C to +85°C
FORWARD CHARACTERISTICS
1.2
0.8
0.4
0.0
Forward Voltage (V)
Forward Current (mA)
0.01 0.1 1 10 100
T
A
= 25°C
16
12
8
4
0
–4
Output Voltage Change (mV)
REVERSE VOLTAGE CHANGE
Reverse Current (mA)
10.01 0.1 10 100
–40°C ≤ T
A
≤ +85°C
REVERSE DYNAMIC IMPEDANCE
Frequency (Hz)
10 100 1k 10k 100k 1M
10k
1k
100
10
1
0.1
Dynamic Impedance (Ω)
T
A
= +25°C
I
REF
= 100µA
4
®
REF1004
TYPICAL PERFORMANCE CURVES 1.2V (CONT)
TA = +25°C unless otherwise noted.
Frequency (Hz)
1k 10k 100k10010
700
600
500
400
300
200
100
0
Noise (nV/√Hz)
NOISE VOLTAGE
I
REF
= 100µA
T
A
= 25°C
FILTERED OUTPUT NOISE
100 1k 10k 100k
Cutoff Frequency (Hz)
Integrated Noise (µV)
70
60
50
40
30
20
10
0
I
REF
= 100µA
100µA
R
C
RESPONSE TIME
Time (µSec)
0 100 200 300 400 500 600
1.5
1.0
0.5
0.0
5
2.5
0
Voltage (V)
36kΩ
V
IN
V
OUT
Output
Input
®
5REF1004
REVERSE CHARACTERISTICS
Reverse Current (µA)
100
10
1
0.1
Reverse Voltage (V)
0.0 0.5 1.0 1.5 2.0 2.5 3.0
–40°C ≤ T
A
≤ +85°C
TYPICAL PERFORMANCE CURVES 2.5V
TA = +25°C unless otherwise noted.
FORWARD CHARACTERISTICS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Forward Voltage (V)
Forward Current (mA)
0.01 0.1 1 10 100
T
A
= +25°C
REVERSE VOLTAGE CHANGE
Reverse Current (mA)
Output Voltage Change (mV)
6
5
4
3
2
1
0
–1
–20.01 0.1 1 10 100
–40°C ≤ T
A
≤ +85°C
Temperature (°C)
–55 –35 –15 5 25 45 65 85 105 125
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
2.475
Reference Voltage (V)
TEMPERATURE DRIFT
REVERSE DYNAMIC IMPEDANCE
1000
100
10
1
0.1
Reverse Impedance (Ω)
Reverse Current (mA)
0.01 0.1 1 10 100
f = 25Hz
–40°C to +85°C
REVERSE DYNAMIC IMPEDANCE
Frequency (Hz)
10 100 1k 10k 100k 1M
10k
1k
100
10
1
0.1
Dynamic Impedance (Ω)
T
A
= +25°C
I
REF
= 100µA
6
®
REF1004
TYPICAL PERFORMANCE CURVES 2.5V (CONT)
TA = +25°C unless otherwise noted.
Noise (nV/√Hz)
Frequency (Hz)
1k 10k 100k10010
1400
1200
1000
800
600
400
200
0
NOISE VOLTAGE
IREF = 100µA
FILTERED OUTPUT NOISE
100
Cutoff Frequency (Hz)
1k 10k 100k
Integrated Noise (µV)
120
100
80
60
40
20
0
100µA
R
C
I
REF
= 100µA
RESPONSE TIME
Voltage (V)
Time (µSec)
4.0
3.0
2.0
1.0
0.0
5.0
0.0 0 100 200 300 400 500 600
24kΩ
V
IN
V
OUT
Output
Input
®
7REF1004
FIGURE 1. Low-Noise Reference.
FIGURE2. Micropower Reference from 9V Battery.
1.5V (see Note)
REF1004-1.2
3kΩ
1.235V
NOTE: Output regulates
to 1.285V for I
O
= 0.
FIGURE 3. 1.2V Reference from 1.5V Battery.
FIGURE 4. 2.5V Reference.
+
100µA
V
I
≥ 5V
22Ω
REF1004-1.2
Output
5µF
9V
REF1004-1.2
510kΩ
1.235V
5V
REF1004-2.5
50kΩ
2.5V
FIGURE 5. Lead-Acid Low-Battery-Voltage Detector.
TLC271 LO = Battery Low
12V
Battery Output
1MΩ
R
1(1)
1%
133kΩ
1% REF1004-1.2
NOTE: (1) R
1
sets trip point, 60.4kΩ per cell for 1.8V per cell.