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參數資料
| 型號： | OPA604AU |
| 元件分類： | 運動控制電子 |
| 英文描述： | FET-Input, Low Distortion OPERATIONAL AMPLIFIER |
| 中文描述： | FET輸入，低失真運算放大器 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 178K |
| 代理商： | OPA604AU |
7
OPA604
TYPICAL PERFORMANCE CURVES
(CONT)
T
A
= +25
°
C, V
S
=
±
15V unless otherwise noted.
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
The OPA604 offset voltage is laser-trimmed and will require
no further trim for most applications. As with most amplifi-
ers, externally trimming the remaining offset can change
drift performance by about 0.3
μ
V/
°
C for each 100
μ
V of
adjusted offset. The OPA604 can replace many other ampli-
fiers by leaving the external null circuit unconnected.
The OPA604 is unity-gain stable, making it easy to use in a
wide range of circuitry. Applications with noisy or high
impedance power supply lines may require decoupling ca-
pacitors close to the device pins. In most cases, a 1
μ
F
tantalum capacitor at each power supply pin is adequate.
DISTORTION MEASUREMENTS
The distortion produced by the OPA604 is below the mea-
surement limit of virtually all commercially available equip-
ment. A special test circuit, however, can be used to extend
the measurement capabilities.
Op amp distortion can be considered an internal error source
which can be referred to the input. Figure 2 shows a circuit
which causes the op amp distortion to be 101 times greater
than normally produced by the op amp. The addition of R
3
to the otherwise standard noninverting amplifier configura-
tion alters the feedback factor or noise gain of the circuit.
The closed-loop gain is unchanged, but the feedback avail-
able for error correction is reduced by a factor of 101. This
extends the measurement limit, including the effects of the
signal-source purity, by a factor of 101. Note that the input
signal and load applied to the op amp are the same as with
conventional feedback without R
3
.
Validity of this technique can be verified by duplicating
measurements at high gain and/or high frequency where the
distortion is within the measurement capability of the test
equipment. Measurements for this data sheet were made
with the Audio Precision System One which greatly simpli-
fies such repetitive measurements. The measurement tech-
nique can, however, be performed with manual distortion
measurement instruments.
CAPACITIVE LOADS
The dynamic characteristics of the OPA604 have been
optimized for commonly encountered gains, loads and oper-
ating conditions. The combination of low closed-loop gain
and capacitive load will decrease the phase margin and may
lead to gain peaking or oscillations. Load capacitance reacts
with the op amp’s open-loop output resistance to form an
additional pole in the feedback loop. Figure 3 shows various
circuits which preserve phase margin with capacitive load.
Request Application Bulletin AB-028 for details of analysis
techniques and applications circuits.
For the unity-gain buffer, Figure 3a, stability is preserved by
adding a phase-lead network, R
C
and C
C
. Voltage drop
FIGURE 1. Offset Voltage Trim.
Supply Voltage, ±V
S
(V)
6
8
10
12
14
16
18
20
22
24
0.5
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
P
POWER DISSIPATION vs SUPPLY VOLTAGE
No signal
or no load
Typical high-level
music R
L
= 600
Worst case sine
wave R
L
= 600
Ambient Temperature (°C)
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T
MAXIMUM POWER DISSIPATION vs TEMPERATURE
25
50
75
100
125
150
= 90°C/W
Soldered to
Circuit Board
(see text)
θ
Maximum
Specified Operating
Temperature
85°C
OPA604
±50mV Typical
Trim Range
NOTE: (1) 50k
to 1M
Trim Potentiometer
(100k
Recommended)
+V
CC
–V
CC
7
6
1
5
(1)
4
3
2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OPA604AU | 制造商:Texas Instruments 功能描述:OP AMP LOW DISTORTION FET SOIC8 |
| OPA604AU/2K5 | 功能描述:音頻放大器 FET-Input Audio Op Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| OPA604AU/2K5G4 | 功能描述:音頻放大器 FET-Input Audio Op Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| OPA604AUE4 | 功能描述:音頻放大器 FET-Input Audio Op Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| OPA606 | 制造商:BB 制造商全稱:BB 功能描述:Wide-Bandwidth Difet OPERATIONAL AMPLIFIER |
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