AD704：低功耗高精度四通道皮安级输入运算放大器
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AD704是一款专为低功耗应用设计的四通道双极性运算放大器，它集成了高性能与低功耗特性于一体。这款器件的突出特点是其极低的输入电流，每通道最大只有150pA，这使得它在工业过程控制、精密测量如电子秤和生物医学设备（如心电图/心电图仪）等场景中表现出色，尤其是在对信号微弱变化极其敏感的环境中。
AD704的高精度设计体现在其75mV的最大偏置电压和1mV/8°C的最大偏置电压漂移上，这意味着在温度变化下，它的性能保持稳定，确保了测量的准确性。此外，其输入偏置电流（IB）的典型漂移仅为0.2pA/8°C，这对于长时间稳定工作至关重要，尤其是在需要长期稳定的信号处理应用中。
低噪声是该运放的另一个重要特性，其典型噪声水平仅为0.5mV峰-峰值，从0.1Hz到10Hz频率范围内表现优异，这有助于过滤掉背景噪音，提高信号的清晰度。考虑到许多应用可能需要长时间连续运行，电源消耗是关键考虑因素，AD704每放大器的最大供电电流仅为600mA，这在电源效率方面具有显著优势。
制造商Analog Devices强调，AD704符合MIL-STD-883B标准，表明其在极端环境下的可靠性和耐用性。此外，该产品还支持EIA-481A标准的带式或卷轴包装，便于集成到各种系统中。
对于用户来说，AD704有两种版本可供选择：单通道版本称为AD705，而双通道版本称为AD706，可以根据实际需要灵活选用。AD704以其卓越的低输入电流特性、低噪声、高精度和低功耗，成为那些追求高分辨率和稳定性的电子工程师的理想选择。
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD704
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
High DC Precision
75 mV max Offset Voltage
1 mV/8C max Offset Voltage Drift
150 pA max Input Bias Current
0.2 pA/8C typical I
B
Drift
Low Noise
0.5 mV p-p typical Noise, 0.1 Hz to 10 Hz
Low Power
600 mA max Supply Current per Amplifier
Chips & MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Single Version: AD705, Dual Version: AD706
PRIMARY APPLICATIONS
Industrial/Process Controls
Weigh Scales
ECG/EKG Instrumentation
Low Frequency Active Filters
PRODUCT DESCRIPTION
The AD704 is a quad, low power bipolar op amp that has the
low input bias current of a BiFET amplifier but which offers a
significantly lower I
B
drift over temperature. It utilizes Super-
beta bipolar input transistors to achieve picoampere input bias
current levels (similar to FET input amplifiers at room tempera-
ture), while its I
B
typically only increases by 5× at +125°C
(unlike a BiFET amp, for which I
B
doubles every 10°C resulting
in a 1000× increase at +125°C). Furthermore the AD704
achieves 75 µV offset voltage and low noise characteristics of a
precision bipolar input op amp.
100
10
1
0.1
0.01
–55 +25 +125
TEMPERATURE – °C
TYPICAL I – nA
B
TYPICAL JFET AMP
AD704T
Figure 1. Input Bias Current Over Temperature
CONNECTION DIAGRAMS
Quad Picoampere Input Current
Bipolar Op Amp
14-Pin Plastic DIP (N)
14-Pin Cerdip (Q) Packages
1 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
3
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT
AD704
(TOP VIEW)
IN
+
IN
+
IN
+
IN
+
+V
S
–V
S
16-Pin SOIC
(R) Package
11
14
1
2
3
4
5
6
7
8
9
10
12
13
14
2
3
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT
+V
S
–V
S
AD704
(TOP VIEW)
15
16
NC = NO CONNECT
NC NC
IN
+
IN
+
IN
+
IN
+
20-Terminal LCC
(E) Package
32
1
20 19
18
17
16
15
14
9
10
11
12
13
4
5
6
7
8
+IN4
NC
–V
S
NC
+IN3
–IN1
OUT1
NC
OUT4
–IN4
+IN1
NC
+V
S
NC
+IN2
–IN2
OUT2
NC
OUT3
–IN3
AMP 1
AMP 2
AMP 4
AMP 3
NC = NO CONNECT
AD704
Since it has only 1/20 the input bias current of an AD OP07, the
AD704 does not require the commonly used “balancing”
resistor. Furthermore, the current noise is 1/5 that of the
AD OP07 which makes the AD704 usable with much higher
source impedances. At 1/6 the supply current (per amplifier) of
the AD OP07, the AD704 is better suited for today’s higher
density circuit boards and battery powered applications.
The AD704 is an excellent choice for use in low frequency
active filters in 12- and 14-bit data acquisition systems, in
precision instrumentation, and as a high quality integrator. The
AD704 is internally compensated for unity gain and is available
in five performance grades. The AD704J and AD704K are rated
over the commercial temperature range of 0°C to +70°C. The
AD704A and AD704B are rated over the industrial temperature
of –40°C to +85°C. The AD704T is rated over the military
temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B, Rev. C.
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