ADA4637-1BRZ-RL Analog Devices Inc, ADA4637-1BRZ-RL Datasheet - Page 15

• Manufacturer Part Number: ADA4637-1BRZ-RL
• Description: 36V HighPerformance JFET Precison AMP
• Manufacturer: Analog Devices Inc

Specifications of ADA4637-1BRZ-RL

• Amplifier Type: J-FET
• Number Of Circuits: 1
• Slew Rate: 170 V/µs
• Gain Bandwidth Product: 79.9MHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 40µV
• Current - Supply: 7mA
• Current - Output / Channel: 45mA
• Voltage - Supply, Single/dual (±): ±5 V ~ 15 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

THD + N MEASUREMENTS
Total harmonic distortion plus noise (THD + N) is usually
measured with an audio analyzer, such as those from Audio
Precision, Inc™. The analyzer consists of a low distortion
oscillator that is swept from the starting frequency to the
ending frequency. The oscillator is connected to the circuit
under test, and the output of the circuit goes back to the
analyzer.
The analyzer has a tunable notch filter in lock step with the
swept oscillator. This removes the fundamental frequency
but allows all of the harmonics and wideband noise to be
measured with an integrating voltmeter. However, there is a
switchable low-pass filter in series with the notch filter. If the
sine wave is at 100 Hz, then the tenth harmonic is still at 1 kHz;
therefore, having a low pass at 80 kHz is not a problem. When
the oscillator reaches 20 kHz, the fourth harmonic (80 kHz)
is partially attenuated, resulting in a lower reading from the
voltmeter. When evaluating THD + N curves from any
manufacturer, careful attention should be paid to the test
conditions. The difference between an 80 kHz low-pass filter
and a 500 kHz filter is shown in Figure 49.
PRINTED CIRCUIT BOARD LAYOUT, BIAS
CURRENT, AND BYPASSING
To take advantage of the very low input bias current of the
ADA4627-1/ADA4637-1 at room temperature, leakage paths
must be considered. A printed circuit board (PCB), with dust
and humidity, can have 100 MΩ of resistance over a few tenths
of an inch. A 1 mV differential between the two points results in
10 pA of leakage current, more than the guaranteed maximum.
The op amp inputs should be guarded by surrounding the nets
with a metal trace maintained at the predicted voltage. In the
case of an inverting configuration or transimpedance amplifier,
(see Figure 50), the inverting and noninverting nodes can be
surrounded by traces held at a quiet analog ground.
0.00001
0.0001
0.001
0.01
0.01
ADA4627-1
T
V
V
R
A
SY
IN
L
= 25°C
= 600Ω
= 810mV
= ±15V
Figure 49. THD + N vs. Frequency
0.1
500kHz FILTER
FREQUENCY (kHz)
1
80kHz FILTER
10
100
Rev. D | Page 15 of 20
For a noninverting configuration, the trace can be driven from
the feedback divider, but the resistors should be chosen to offer
a low impedance drive to the trace (see Figure 51).
The board layout should be compact with traces as short as
possible. For second-order board considerations, such as
triboelectric effects and piezoelectric effects, as well as a table
of insulating material properties, see the
In some cases, shielding from air currents may be helpful.
A general rule of thumb, for op amps with gain bandwidth
products higher than 1 MHz, bypass capacitors should be very
close to the part, within 3 mm. Each supply should be bypassed
with a 0.01 µF ceramic capacitor in parallel with a 1 µF bulk
decoupling capacitor. The ceramic capacitors should be closer
to the op amp. Sockets, which add inductance and capacitance,
should not be used.
OUTPUT PHASE REVERSAL
Output phase reversal occurs in some amplifiers when the input
common-mode voltage range is exceeded. As common-mode
voltage is moved outside the common-mode range, the outputs
of these amplifiers can suddenly jump in the opposite direction
to the supply rail. This is the result of the differential input pair
shutting down, causing a radical shifting of internal voltages
that results in the erratic output behavior.
The ADA4627-1/ADA4637-1 amplifiers have been carefully
designed to prevent any output phase reversal if both inputs are
maintained within the specified input voltage range. If one or
both inputs exceed the input voltage range but remain within
the supply rails, an internal loop opens and the output varies.
Therefore, the inputs should always be a minimum of 3 V away
from either supply rail.
I
V
N
S
Figure 51. Noninverting Amplifier with Guard
+
–
Figure 50. Inverting Amplifier with Guard
GUARD
GUARD
ADA4627-1/ADA4637-1
2
3
3
2
ADA4627-1
ADA4627-1
8
8
C
R
F
F
AD549
6
6
R
R
V
data sheet.
V
–
OUT
F
I
OUT
+
–
+