AD586TQ/883B Analog Devices Inc, AD586TQ/883B Datasheet - Page 7

• Manufacturer Part Number: AD586TQ/883B
• Manufacturer: Analog Devices Inc

Specifications of AD586TQ/883B

• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 5V
• Temperature Coefficient: 10ppm/°C
• Reference Voltage Accuracy (max): 2.5
• Line Regulation: 150uV/V
• Load Regulation: 400uV/mA
• Input Voltage (max): 36V
• Operating Temp Range: -55C to 125C
• Operating Temperature Classification: Military
• Mounting: Through Hole
• Pin Count: 8
• Package Type: CDIP
• Lead Free Status / Rohs Status: Not Compliant

THEORY OF OPERATION
The AD586 consists of a proprietary buried Zener diode refer-
ence, an amplifier to buffer the output, and several high stability
thin-film resistors, as shown in the block diagram in Figure 5.
This design results in a high precision monolithic 5 V output
reference with initial offset of 2.0 mV or less. The temperature
compensation circuitry provides the device with a temperature
coefficient of under 2 ppm/°C.
Using the bias compensation resistor between the Zener output
and the noninverting input to the amplifier, a capacitor can be
added at the noise reduction pin (Pin 8) to form a low-pass
filter and reduce the noise contribution of the Zener to the
circuit.
APPLYING THE AD586
The AD586 is simple to use in virtually all precision reference
applications. When power is applied to Pin 2 and Pin 4 is
grounded, Pin 6 provides a 5 V output. No external components
are required; the degree of desired absolute accuracy is achieved
simply by selecting the required device grade. The AD586
requires less than 3 mA quiescent current from an operating
supply of 12 V or 15 V.
An external fine trim may be desired to set the output level to
exactly 5.000 V (calibrated to a main system reference). System
calibration may also require a reference voltage that is slightly
different from 5.000 V, for example, 5.12 V for binary applica-
tions. In either case, the optional trim circuit shown in Figure 6
can offset the output by as much as 300 mV with minimal effect
on other device characteristics.
NOTES
1. PINS 1, 3, AND 7 ARE INTERNAL TEST POINTS.
MAKE NO CONNECTIONS TO THESE POINTS.
V
2
IN
Figure 5. Functional Block Diagram
R
R
Z1
Z2
NOISE REDUCTION
R
S
GND
4
8
A1
AD586
R
R
F
I
R
T
6
5
V
TRIM
OUT
Rev. G | Page 7 of 16
REDUCTION
CAPACITOR
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD586 is typically less than 4 µV p-p
over the 0.1 Hz to 10 Hz band. Noise in a 1 MHz bandwidth is
approximately 200 µV p-p. The dominant source of this noise is
the buried Zener, which contributes approximately 100 nV/√Hz.
By comparison, contribution by the op amp is negligible. Figure 7
shows the 0.1 Hz to 10 Hz noise of a typical AD586. The noise
measurement is made with a band-pass filter made of a 1-pole
high-pass filter with a corner frequency at 0.1 Hz, and a 2-pole
low-pass filter with a corner frequency at 12.6 Hz, to create a
filter with a 9.922 Hz bandwidth.
If further noise reduction is desired, an external capacitor can
be added between the noise reduction pin and ground, as
shown in Figure 6. This capacitor, combined with the 4 kΩ R
and the Zener resistances, forms a low-pass filter on the output
of the Zener cell. A 1 µF capacitor will have a 3 dB point at
12 Hz, and will reduce the high frequency (to 1 MHz) noise to
about 160 µV p-p. Figure 8 shows the 1 MHz noise of a typical
AD586, both with and without a 1 µF capacitor.
OPTIONAL
NOISE
1µF
C
1µF
N
Figure 6. Optional Fine-Trim Configuration
8
NOISE
REDUCTION
Figure 7. 0.1 Hz to 10 Hz Noise
1µF
AD586
GND
V
V
4
2
IN
IN
TRIM
V
O
6
5
5s
10kΩ
AD586
OUTPUT
S