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AD546JN データシート(PDF) 8 Page - Analog Devices

部品番号 AD546JN
部品情報  1 pA Monolithic Electrometer Operational Amplifier
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD546JN データシート(HTML) 8 Page - Analog Devices

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AD546
REV. A
–8–
Figure 28. Input Pin to Insulating Standoff
Leakage through the bulk of the circuit board will still occur
with the guarding schemes shown in Figures 27a and 27b. Stan-
dard “G10” type printed circuit board material may not have
high enough volume resistivity to hold leakages at the sub-
picoampere level particularly under high humidity conditions.
One option that eliminates all effects of board resistance
is shown in Figure 28. The AD546’s sensitive input pin (either
Pin 2 when connected as an inverter, or Pin 3 when connected
as a follower) is bent up and soldered directly to a Teflon* insu-
lated standoff. Both the signal input and feedback component
leads must also be insulated from the circuit board by Teflon
standoffs or low-leakage shielded cable.
Contaminants such as solder flux on the board’s surface and on
the amplifier’s package can greatly reduce the insulation resis-
tance between the input pin and those traces with supply or sig-
nal voltages. Both the package and the board must be kept clean
and dry. An effective cleaning procedure is to first swab the sur-
face with high grade isopropyl alcohol, then rinse it with deion-
ized water and, finally, bake it at 80
°C for 1 hour. Note that if
either polystyrene or polypropylene capacitors are used on the
printed circuit board, a baking temperature of 70
°C is safer,
since both of these plastic compounds begin to melt at approxi-
mately +85
°C.
Other guidelines include making the circuit layout as compact
as possible and reducing the length of input lines. Keeping cir-
cuit board components rigid and minimizing vibration will re-
duce triboelectric and piezoelectric effects. All precision high
impedance circuitry requires shielding from electrical noise and
interference. For example, a ground plane should be used under
all high value (i.e., greater than 1 M
Ω) feedback resistors. In
some cases, a shield placed over the resistors, or even the entire
amplifier, may be needed to minimize electrical interference
originating from other circuits. Referring to the equation in Fig-
ure 26, this coupling can take place in either, or both, of two
different forms—coupling via time varying fields:
dV
dT
CP
or by injection of parasitic currents by changes in capacitance
due to mechanical vibration:
dCp
dT
V
Both proper shielding and rigid mechanical mounting of compo-
nents help minimize error currents from both of these sources.
Table I lists various insulators and their properties.
Table I. Insulating Materials and Characteristics
Volume
Minimal
Minimal
Resistance
Resistivity
Triboelectric
Piezoelectric to Water
Material
1
(
–CM)
Effects
Effects
Absorption
Teflon*
10
17–1018
WW
G
Kel-F**
1017–1018
WM
G
Sapphire
10
16–1018
MG
G
Polyethylene
10
14–1018
MG
M
Polystyrene
1012–1018
WM
M
Ceramic
10
12–1014
WM
W
Glass Epoxy
10
10–1017
WM
W
PVC
1010–1015
GM
G
Phenolic
10
5–1012
WG
W
G–Good with Regard to Property.
M–Moderate with Regard to Property.
W–Weak with Regard to Property.
1Electronic Measurements, pp.15-17, Keithley Instruments, Inc., Cleveland,
Ohio, 1977.
*Teflon is a registered trademark of E.I. du Pont Co.
**Kel-F is a registered trademark of 3M Company.
OFFSET NULLING
The AD546’s input offset voltage can be nulled by using balance
Pins 1 and 5, as shown in Figure 29. Nulling the input offset
voltage in this fashion will introduce an added input offset volt-
age drift component of 2.4
µV/°C per millivolt of nulled offset.
Figure 29. Standard Offset Null Circuit
The circuit in Figure 30 can be used when the amplifier is used
as an inverter. This method introduces a small voltage in series
with the amplifier’s positive input terminal. The amplifier’s


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