SGM8264-2 [SGMICRO]
High-Performance, Bipolar-Input, Ultra Low Noise HiFi Audio Headset Driver;
| 型号： | SGM8264-2 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | High-Performance, Bipolar-Input, Ultra Low Noise HiFi Audio Headset Driver |
| 文件： | 总16页 (文件大小：916K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM8264-2
High-Performance, Bipolar-Input,
Ultra Low Noise HiFi Audio Headset Driver
GENERAL DESCRIPTION
FEATURES
The SGM8264-2 bipolar-input headset driver achieves
very low 1.6nV/ noise density with an ultra low
• Superior Sound Quality
• Low Offset Voltage: ±350μV (MAX)
Hz
Hz
distortion of 0.00002% at 1kHz. The SGM8264-2 offers
rail-to-rail output swing to within 150mV of supply rails
with a 2kΩ load, which increases headroom and
maximizes dynamic range. The device also has a high
output drive capability of ±110mA.
• Ultra Low Noise: 1.6nV/
at 1kHz
• Ultra Low Distortion: 0.00002% at 1kHz
• High Slew Rate: 16V/μs
• Gain-Bandwidth Product: 16MHz (G = +1)
• High Open-Loop Gain: 140dB
• Unity-Gain Stable
The device operates over a wide supply range of 3.6V
to 36V or ±1.8V to ±18V, on only 4.1mA of supply
current per amplifier. The SGM8264-2 is unity-gain
stable and provides excellent dynamic behavior over a
wide range of load conditions.
• Low Quiescent Current: 4.1mA/Amplifier
• Rail-to-Rail Output
• Support Single or Dual Power Supplies:
3.6V to 36V or ±1.8V to ±18V
• -40℃ to +85℃ Operating Temperature Range
• Available in a Green SOIC-8 Package
The SGM8264-2 is available in a Green SOIC-8
package. It operates over an ambient temperature
range of -40℃ to +85℃.
APPLICATIONS
Professional Audio Equipment
Analog and Digital Mixing Consoles
High-End A/V Receivers
SG Micro Corp
DECEMBER 2017 - REV. A
www.sg-micro.com
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM
SGM8264-2
SOIC-8
SGM8264-2YS8G/TR
82642YS8
XXXXX
Tape and Reel, 2500
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXXX = Date Code and Vendor Code.
X X X X X
Vendor Code
Date Code - Week
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
Supply Voltage, +VS to -VS.............................................. 40V
Input Voltage Range ...................(-VS) - 0.3V to (+VS) + 0.3V
Input Current (All pins except power supply pins)...... ±10mA
Output Short-Circuit Current.................................... ±180mA
Junction Temperature .................................................+150℃
Storage Temperature Range.........................-65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
DISCLAIMER
SG Micro Corp reserves the right to make any change in
HBM.............................................................................8000V
MM.................................................................................400V
CDM ............................................................................1000V
circuit design, or specifications without prior notice.
PIN CONFIGURATION
RECOMMENDED OPERATING CONDITIONS
(TOP VIEW)
Operating Temperature Range .......................-40℃ to +85℃
OUTA
-INA
+INA
-VS
1
2
3
4
8
7
6
5
+VS
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
OUTB
-INB
+INB
+
+
ESD SENSITIVITY CAUTION
SOIC-8
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
2
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
ELECTRICAL CHARACTERISTICS
(At TA = +25℃, VS = 4.5V to 36V or VS = ±2.25V to ±18V, RL = 2kΩ, VCM = VOUT = VS/2, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Characteristics
VS = ±15V
±100
±350
±450
Input Offset Voltage (VOS
)
μV
μV/℃
nA
-40℃ ≤ TA ≤ +85℃
VS = ±15V
Input Offset Voltage Drift (ΔVOS/ΔT)
1
VCM = VOUT = VS/2
-40℃ ≤ TA ≤ +85℃
VCM = VOUT = VS/2
±40
±300
±550
Input Bias Current (IB)
Input Offset Current (IOS
)
±25
120
135
±175
nA
V
Input Common Mode Voltage Range (VCM
)
(-VS) + 1.8
102
(+VS) - 1.8
VS = 4.5V, (-VS) + 1.8V ≤ VCM ≤ (+VS) - 1.8V
-40℃ ≤ TA ≤ +85℃
99
Common Mode Rejection Ratio (CMRR)
dB
dB
VS = 36V, (-VS) + 1.8V ≤ VCM ≤ (+VS) - 1.8V
122
108
-40℃ ≤ TA ≤ +85℃
VS = 4.5V to 36V,
(-VS) + 0.2V ≤ VOUT ≤ (+VS) - 0.2V, RL = 10kΩ
110
107
112
109
140
140
-40℃ ≤ TA ≤ +85℃
VS = 4.5V to 36V,
(-VS) + 0.6V ≤ VOUT ≤ (+VS) - 0.6V, RL = 2kΩ
Open-Loop Voltage Gain (AOL
)
-40℃ ≤ TA ≤ +85℃
Input Impedance
Differential
32k || 10
109 || 4
Ω || pF
Ω || pF
Common Mode
Output Characteristics
VS = 4.5V to 36V, RL = 10kΩ
VS = 4.5V to 36V, RL = 2kΩ
VS = 10V to 36V
±35
±150
±110
±65
Output Voltage Swing from Rail
mV
mA
±260
Output Short-Circuit Current (ISC
)
Audio Performance
0.00002
-134
%
dB
%
Total Harmonic Distortion + Noise (THD+N) G = +1, VOUT = 3VRMS, f = 1kHz
0.000015
-136
G = +1, VOUT = 3VRMS, SMPTE/DIN,
Two-Tone, 4:1 (60Hz and 7kHz)
dB
%
0.000032
-130
G = +1, VOUT = 3VRMS, DIM 30,
Intermodulation Distortion (IMD)
(3kHz square wave and 15kHz sine wave)
dB
%
0.00013
-118
G = +1, VOUT = 3VRMS, CCIF Twin-Tone,
(19kHz and 20kHz)
dB
Frequency Response
G = +100
Gain-Bandwidth Product (GBP)
G = +1
45
16
MHz
Slew Rate (SR)
G = -1
16
V/μs
MHz
ns
Full Power Bandwidth (1)
Overload Recovery Time
Channel Separation (Dual)
VOUT = 1VP-P
G = -10
2
500
-140
f = 1kHz
dB
NOTE: 1. Full Power Bandwidth = SR/(2π × VP), where SR = Slew Rate.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
3
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
ELECTRICAL CHARACTERISTICS (continued)
(At TA = +25℃, VS = 4.5V to 36V or VS = ±2.25V to ±18V, RL = 2kΩ, VCM = VOUT = VS/2, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Noise Performance
Input Voltage Noise
f = 20Hz to 20kHz
1.7
5
μVP-P
f = 10Hz
f = 100Hz
f = 1kHz
f = 1kHz
nV/
Input Voltage Noise Density (en)
2
Hz
1.6
6
pA/
Input Current Noise Density (in)
Power Supply
Hz
Supply Voltage (VS)
±1.8
±18
±18
5.5
5.8
0.5
1
V
V
Specified Voltage (VS)
±2.25
VS = 3.6V to 36V, IOUT = 0
-40℃ ≤ TA ≤ +85℃
VS = ±1.8V to ±18V
-40℃ ≤ TA ≤ +85℃
4.1
0.1
Quiescent Current/Amplifier (IQ)
mA
Power Supply Rejection Ratio (PSRR)
μV/V
SG Micro Corp
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DECEMBER 2017
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High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, VS = ±15V and RL = 2kΩ, unless otherwise noted.
Small-Signal Step Response (100mV)
Small-Signal Step Response (100mV)
G = +1
G = -1
CL = 50pF
CL = 50pF
Time (100ns/div)
Time (100ns/div)
Large-Signal Step Response
Large-Signal Step Response
G = +1
G = -1
CL = 50pF
RL = 2kΩ
CL = 50pF
RL = 2kΩ
RF = 75Ω
RF = 0Ω
Time (500ns/div)
Time (500ns/div)
Small-Signal Overshoot vs.
Small-Signal Overshoot vs.
Capacitive Load (100mV Output Step)
Capacitive Load (100mV Output Step)
70
60
50
40
30
20
10
70
60
50
40
30
20
10
G = -1
G = +1
RS = 0Ω
RS = 0Ω
RS = 25Ω
RS = 25Ω
RS = 50Ω
RS = 50Ω
0
100
200
300
400
500
600
0
200
400
600
800
1000
Load Capacitance (pF)
Load Capacitance (pF)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
5
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V and RL = 2kΩ, unless otherwise noted.
IB and IOS vs. Temperature
IB and IOS vs. Input Common Mode Voltage
80
60
40
20
0
50
10
-IB
IOS
-30
+IB
-70
+IB
-20
-40
-60
-110
-150
IOS
-IB
-40
-15
10
35
60
85
-18
-12
-6
0
6
12
18
Input Common Mode Voltage (V)
Temperature (℃)
Quiescent Current vs. Temperature
Quiescent Current vs. Supply Voltage
9
8.5
8
9.5
9
8.5
8
7.5
7
7.5
-40
-15
10
35
60
85
0
6
12
18
24
30
36
Temperature (℃)
Supply Voltage (V)
Output Short-Circuit Current vs. Temperature
Output Voltage vs. Output Current
300
240
180
120
60
15
10
5
VS = ±5V
-ISC
0
+85℃
+25℃ -40℃
-5
+ISC
-10
-15
0
0
50
100
150
200
250
300
-40 -25 -10
5
20 35 50 65 80 95 110 125
Output Current (mA)
Temperature (℃)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
6
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V and RL = 2kΩ, unless otherwise noted.
Open-Loop Gain vs. Temperature
Closed-Loop Gain vs. Frequency
0.025
0.02
0.015
0.01
0.005
0
25
15
5
RL = 2kΩ
G = +10
G = +1
-5
G = -1
-15
-25
RL = 10kΩ
100
1000
10000
100000
-40
-15
10
35
60
85
Frequency (kHz)
Temperature (℃)
0.1Hz to 10Hz Noise
Gain and Phase vs. Frequency
100
80
60
40
20
0
0
-30
Gain
-60
-90
-120
-150
-180
Phase
-20
10
100
1000
10000
100000
Time (1s/div)
Frequency (kHz)
Input Voltage Noise Density (en) and
Input Current Noise Density (in) vs. Frequency
Input Voltage Noise Density vs. Source Resistance
10000
1000
100
10
100
Total Output
Voltage Noise
in
10
en
Resistor Noise
1
1
100
1000
10000
100000
1000000
10
100
1000
10000
100000
Source Resistance (Ω)
Frequency (Hz)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
7
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V and RL = 2kΩ, unless otherwise noted.
THD+N Ratio vs. Frequency
THD+N Ratio vs. Frequency
-115
-120
-125
-130
-135
-140
-115
-120
-125
-130
-135
-140
BW = 80kHz
OUT = 3VRMS
BW = 80kHz
OUT = 3VRMS
V
V
— G = +1, RL = 600Ω
— G = +1, RL = 2kΩ
— G = -1, RL = 600Ω
— G = -1, RL = 2kΩ
— G = +10, RL = 600Ω
— G = +10, RL = 2kΩ
Rsource = 600Ω
Rsource = 300Ω
Rsource = 150Ω
Rsource = 0Ω
10
100
1000
Frequency (Hz)
10000
100000
10
100
1000
10000
100000
Frequency (Hz)
THD+N Ratio vs. Frequency
THD+N Ratio vs. Frequency
-95
-105
-115
-125
-135
-100
-110
-120
-130
-140
BW > 500kHz
OUT = 3VRMS
BW > 500kHz
OUT = 3VRMS
V
V
— G = +1, RL = 600Ω
— G = +1, RL = 2kΩ
— G = -1, RL = 600Ω
— G = -1, RL = 2kΩ
— G = +11, RL = 600Ω
— G = +11, RL = 2kΩ
Rsource = 600Ω
Rsource = 300Ω
Rsource = 150Ω
Rsource = 0Ω
10
100
1000
Frequency (Hz)
10000
100000
10
100
1000
10000
100000
Frequency (Hz)
THD+N Ratio vs. Output Amplitude
Intermodulation Distortion vs. Output Amplitude
-80
-100
-120
-140
-160
-80
-100
-120
-140
-160
DIM 30
— G = +1, RL = 600Ω
— G = +1, RL = 2kΩ
— G = -1, RL = 600Ω
— G = -1, RL = 2kΩ
— G = +10, RL = 600Ω
— G = +10, RL = 2kΩ
CCIF Twin-Tone
SMPTE/DIN
0.1
1
10
100
0.01
0.1
1
10
100
Output Amplitude (VRMS
)
Output Amplitude (VRMS
)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
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High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, VS = ±15V and RL = 2kΩ, unless otherwise noted.
PSRR vs. Frequency (Referred to Input)
CMRR vs. Frequency (Referred to Input)
100
80
60
40
20
0
160
120
80
40
0
+PSRR
-PSRR
0.01
0.1
1
10
100
1000 10000
0.01
0.1
1
10
100
1000
Frequency (kHz)
Frequency (kHz)
Maximum Output Voltage vs. Frequency
Channel Separation vs. Frequency
30
25
20
15
10
5
-80
-100
-120
-140
-160
-180
VS = ±15V
VOUT = 3VRMS
G = +1
VS = ±15V
RL = 600Ω
VS = ±5V
RL = 5kΩ
RL = 2kΩ
VS = ±2.25V
0
10
100
1000
10000
10
100
1000
Frequency (Hz)
10000
100000
Frequency (kHz)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
9
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
APPLICATION INFORMATION
The SGM8264-2 is a unity-gain stable, precision driver
with very low noise; the device is also free from output
phase reversal. Applications with noisy or high-impedance
power supplies require decoupling capacitors close to
the device power supply pins. In most cases, 0.1μF
capacitors are adequate.
Noise Performance
Equation 1 shows the total circuit noise for varying
source impedances with the operational amplifier in a
unity-gain configuration (Figure 2, no feedback resistor
network, and therefore no additional noise contributions).
The SGM8264-2 (GBP = 16MHz, G = +1) is shown with
total circuit noise calculated. The operational amplifier
itself contributes both a voltage noise component and a
current noise component. The voltage noise is commonly
modeled as a time-varying component of the offset
voltage. The current noise is modeled as the time-
varying component of the input bias current and reacts
with the source resistance to create a voltage component
of noise. Therefore, the lowest noise operational
amplifier for a given application depends on the source
impedance. For low source impedance, current noise is
negligible, and voltage noise generally dominates. The
low voltage noise of the SGM8264-2 driver makes it a
good choice for use in applications where the source
impedance is less than 1kΩ.
Operating Voltage
The SGM8264-2 driver operates from 3.6V to 36V or
±2.25V to ±18V supplies while maintaining excellent
performance. However, some applications do not
require equal positive and negative output voltage
swing. With the SGM8264-2, power supply voltages do
not need to be equal. For example, the positive supply
could be set to +25V with the negative supply at -5V. In
all cases, the input common mode voltage must be
maintained within the specified range. In addition, key
parameters are assured over the specified temperature
range of TA = -40℃ to +85℃.
Input Protection
The following equation shows the calculation of the
total circuit noise:
The input terminals of the SGM8264-2 are protected
from excessive differential voltage with back-to-back
diodes, as Figure 1 illustrates. In most circuit applications,
the input protection circuitry has no consequence.
However, in low-gain or G = +1 circuits, fast ramping
input signals can forward bias these diodes because
the output of the amplifier cannot respond rapidly
enough to the input ramp. If the input signal is fast
enough to create this forward bias condition, the input
signal current must be limited to 10mA or less. If the
input signal current is not inherently limited, an input
series resistor (RI) and/or a feedback resistor (RF) can
be used to limit the signal input current. This input
series resistor degrades the low-noise performance of
the SGM8264-2 and is examined in the following Noise
Performance section. Figure 1 shows an example
configuration when both current-limit input and feedback
EO2 = en2 + (inRS )2 + 4kTRS
(1)
Where en = voltage noise, in = current noise, RS
source impedance, k = Boltzmann’s constant = 1.38 ×
10-23J/K, T = temperature in degrees Kelvin (K).
=
-
EO
+
RS
Figure 2. Unity-Gain Buffer Configuration
resistors are used.
RF
-
1
2
Output
SGM8264-2
RI
+
Input
Figure 1. Input Current Limit
SG Micro Corp
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DECEMBER 2017
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High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
APPLICATION INFORMATION (continued)
feedback resistors to minimize the respective
contributions to the total noise.
Basic Noise Calculations
Design of low-noise operational amplifier circuits
requires careful consideration of a variety of possible
noise contributors: noise from the signal source, noise
generated in the operational amplifier and noise from
the feedback network resistors. The total noise of the
circuit is the root-sum-square combination of all noise
components.
Figure 3 illustrates both inverting and non-inverting
operational amplifier circuit configurations with gain. In
circuit configurations with gain, the feedback network
resistors also contribute noise.
The current noise of the operational amplifier reacts
with the feedback resistors to create additional noise
components. The feedback resistor values can generally
be chosen to make these noise sources negligible. The
equations for total noise are shown for both
configurations.
The resistive portion of the source impedance produces
thermal noise proportional to the square root of the
resistance. The source impedance is usually fixed;
consequently, select the operational amplifier and the
Noise in Non-Inverting Gain Configuration
R2
Noise at the output:
2
2
+ eS + i R 1 +
n S
2
R
R
2
2
2
2
2
2
n
2
2
EO
=
1 +
en + e12 + e2
+
i R
(
)
(
)
R1
R1
R1
-
R
2
Where eS
=
4kTRS × 1 +
= thermal noise of RS
EO
R1
R2
+
e1
e2
=
=
4kTR1 ×
= thermal noise of R1
R
1
RS
4kTR 2 = thermal noise of R2
VS
Noise in Inverting Gain Configuration
R2
Noise at the output:
2
R2
2
2
2
2
2
EO
=
1 +
en + e12 + e2
+
i R
2
+ eS
(
)
n
R1+RS
R1
-
R2
Where
eS
=
4kTRS ×
= thermal noise of RS
= thermal noise of R1
R1 + RS
EO
RS
R2
+
e1
=
4kTR1
4kTR 2
×
R1 + RS
VS
e2
=
= thermal noise of R2
NOTE: For the SGM8264-2 driver at 1kHz, en = 1.6nV/
and in = 6pA/
.
Hz
Hz
Figure 3. Noise Calculation in Gain Configurations
SG Micro Corp
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DECEMBER 2017
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High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
APPLICATION INFORMATION (continued)
Validity of this technique can be verified by duplicating
Total Harmonic Distortion Measurements
The SGM8264-2 driver has excellent distortion
characteristics. THD + noise is below 0.00015% (G =
+1, VOUT = 3VRMS, BW = 80kHz) throughout the audio
frequency range, 20Hz to 20kHz, with a 2kΩ load.
measurements at high gain and/or high frequency
where the distortion is within the measurement
capability of the test equipment. Measurements for this
datasheet were made with an Audio Precision System
Two distortion/noise analyzer, which greatly simplifies
such repetitive measurements. The measurement
technique can, however, be performed with manual
distortion measurement instruments.
The distortion produced by SGM8264-2 driver is below
the measurement limit of many commercially available
distortion analyzers. However, a special test circuit
(such as Figure 4 shows) can be used to extend the
measurement capabilities.
Capacitive Loads
Operational amplifier distortion can be considered an
internal error source that can be referred to the input.
Figure 4 shows a circuit that causes the operational
amplifier distortion to be 101 times (or approximately
40dB) greater than that normally produced by the
operational amplifier. The addition of R3 to the otherwise
standard non-inverting amplifier configuration alters the
feedback factor or noise gain of the circuit. The
closed-loop gain is unchanged, but the feedback
available for error correction is reduced by a factor of
101, thus extending the resolution by 101. Note that the
input signal and load applied to the operational
amplifier are the same as with conventional feedback
without R3. The value of R3 should be kept small to
minimize its effect on the distortion measurements.
The dynamic characteristics of the SGM8264-2 have
been optimized for commonly encountered gains, loads,
and operating conditions. The combination of low
closed-loop gain and high capacitive loads decreases
the phase margin of the amplifier and can lead to gain
peaking or oscillations. As a result, heavier capacitive
loads must be isolated from the output. The simplest
way to achieve this isolation is to add a small resistor
(RS equal to 50Ω, for example) in series with the output.
Power Dissipation
SGM8264-2 driver is capable of driving 2kΩ loads with
a power supply voltage up to ±18V. Internal power
dissipation increases when operating at high supply
voltages. Copper leadframe construction used in the
SGM8264-2 driver improves heat dissipation compared
to conventional materials. Circuit board layout can also
help minimize junction temperature rise. Wide copper
traces help dissipate the heat by acting as an additional
heat sink. Temperature rise can be further minimized by
soldering the device to the circuit board rather than
using a socket.
R1
R2
-
1
2
R3
VOUT = 3VRMS
SGM8264-2
+
Signal Gain = 1 + R2/R1
Distortion Gain = 1 + R2/(R1||R3)
Generator
Output
Analyzer
Input
Electrical Overstress
Designers often ask questions about the capability of
an operational amplifier to withstand electrical overstress.
These questions tend to focus on the device inputs, but
may involve the supply voltage pins or even the output
pin. Each of these different pin functions has electrical
stress limits determined by the voltage breakdown
characteristics of the particular semiconductor fabrication
process and specific circuits connected to the pin.
Additionally, internal electrostatic discharge (ESD)
protection is built into these circuits to protect them
from accidental ESD events both before and during
product assembly.
Audio Precision
System Two with
PC Controller
Load
SIG.
Gain
DIST.
Gain
R1
R2
R3
∞
1
-1
101
101
110
1kΩ
10Ω
4.99kΩ
549Ω
4.99kΩ
4.99kΩ
49.9Ω
49.9Ω
+10
Figure 4. Distortion Test Circuit
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
12
High-Performance, Bipolar-Input,
SGM8264-2
Ultra Low Noise HiFi Audio Headset Driver
APPLICATION CIRCUIT
Figure 5 shows how to use the SGM8264-2 as an
amplifier for professional audio headphones. The circuit
shows the left side stereo channel. An identical circuit is
used to drive the right side stereo channel.
820Ω
2200pF
+VA
0.1μF
(+15V)
330Ω
-
IOUTL+
1
2
SGM8264-2
2700pF
+
-VA
(-15V)
680Ω
620Ω
+VA
(+15V)
0.1μF
0.1μF
Audio DAC
with Differential
Current
-
1
2
100Ω
L Ch
Output
Outputs
820Ω
2200pF
SGM8264-2
8200pF
+
-VA
(-15V)
0.1μF
+VA
0.1μF
(+15V)
680Ω
620Ω
330Ω
IOUTL-
-
1
2
SGM8264-2
2700pF
+
-VA
(-15V)
0.1μF
Figure 5. Audio DAC Post Filter (I/V Converter and Low-Pass Filter)
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (DECEMBER 2017) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOIC-8
0.6
D
e
2.2
E1
E
5.2
b
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
c
θ
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
1.750
0.250
1.550
0.510
0.250
5.100
4.000
6.200
MIN
MAX
0.069
0.010
0.061
0.020
0.010
0.200
0.157
0.244
A
A1
A2
b
1.350
0.100
1.350
0.330
0.170
4.700
3.800
5.800
0.053
0.004
0.053
0.013
0.006
0.185
0.150
0.228
c
D
E
E1
e
1.27 BSC
0.050 BSC
L
0.400
0°
1.270
8°
0.016
0°
0.050
8°
θ
SG Micro Corp
www.sg-micro.com
TX00010.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOIC-8
13″
12.4
6.40
5.40
2.10
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
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