ad704ar Analog Devices, Inc., ad704ar Datasheet

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ad704ar

Manufacturer Part Number
ad704ar
Description
Quad Picoampere Input Current Bipolar Op Amp
Manufacturer
Analog Devices, Inc.
Datasheet

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a
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
bipolar input transistors to achieve picoampere input bias current
levels (similar to FET input amplifiers at room temperature),
while its I
BiFET amp, for which I
1000× increase at 125°C). Furthermore, the AD704 achieves
75 µV offset voltage and low noise characteristics of a precision
bipolar input op amp.
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
is 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.
B
typically only increases by 5× at 125°C (unlike a
B
drift over temperature. It utilizes super-beta
B
doubles every 10°C resulting in a
14-Lead CerDIP (Q) Packages
OUTPUT
OUTPUT
14-Lead Plastic DIP (N)
+V
Quad Picoampere Input Current
+IN
–IN
–IN
+IN
S
1
2
3
4
5
6
7
100
0.01
(TOP VIEW
0.1
1
2
10
AD704
1
–55
+IN1
+IN2
+V
NC
NC
S
4
4
5
6
7
8
3
CONNECTION DIAGRAMS
)
14
13
12
11
10
9
8
3
9
20-Terminal LCC
AMP 1
AMP 2
OUTPUT
–IN
+IN
–V
+IN
–IN
OUTPUT
S
10
TEMPERATURE – C
2
(E) Package
AD704
11
1
OUTPUT
OUTPUT
AMP 4
AMP 3
+25
12
20 19
Bipolar Op Amp
TYPICAL JFET AMP
+V
–IN
+IN
+IN
–IN
NC
13
S
1
2
3
4
5
6
7
8
NC = NO CONNECT
AD704T
NC = NO CONNECT
18
17
16
15
14
16-Lead SOIC
(R) Package
(TOP VIEW)
1
2
+IN4
NC
–V
NC
AD704
+IN3
S
AD704
4
3
+125
16
15
14
13
12
11
10
9
OUTPUT
–IN
+IN
–V
+IN
–IN
OUTPUT
NC
S

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ad704ar Summary of contents

Page 1

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 drift over temperature. It utilizes super-beta B bipolar input ...

Page 2

AD704–SPECIFICATIONS Parameters Conditions INPUT OFFSET VOLTAGE Initial Offset Offset T vs. Temp, Average TC vs. Supply (PSRR –T V MIN MAX Long-Term Stability 1 INPUT BIAS CURRENT V V vs. Temp, Average TC T –T V MIN MAX ...

Page 3

Parameters Conditions OUTPUT CHARACTERISTICS Voltage Swing R T Current Short Circuit CAPACITIVE LOAD Drive Capability Gain = 1 POWER SUPPLY Rated Performance Operating Range Quiescent Current T TRANSISTOR COUNT # of Transistors NOTES 1 Bias current specifications are guaranteed maximum ...

Page 4

... AD704KN 0°C to 70°C AD704AN –40°C to +85°C AD704AR –40°C to +85°C AD704AR-REEL –40°C to +85°C AD704SE/883B –55°C to +125°C AD704TQ/883B –55°C to +125°C Chips are also available. Not for new designs; obsolete April 2002. ...

Page 5

dc, unless otherwise noted –80 –40 0 +40 +80 INPUT OFFSET VOLTAGE – –0.5 –1.0 –1.5 +1.5 +1.0 +0.5 – ...

Page 6

AD704 1000 100 100 1000 FREQUENCY – Hz 500 450 400 +125 C +25 C 350 –55 C 300 SUPPLY VOLTAGE – V 10M – +125 C ...

Page 7

A = –1000 0.1 0. 1mA OUT 0.001 1 10 100 1k 10k 100k FREQUENCY – 100 20mV Ω 100 ...

Page 8

AD704 GAIN TRIM (500k POT) OPTIONAL AC CMRR TRIM 2.4k 6.34k 47. CMRR 0.1 F TRIM (5k POT) – 1/4 AD704 + – INSTRUMENTATION AMPLIFIER GAIN ...

Page 9

The 1 Hz, 4-pole active filter offers dc precision with a minimum of components and cost. The low current noise, I allow the use of 1 MΩ resistors without sacrificing the 1 µV/°C drift of the AD704. This means lower ...

Page 10

AD704 14-Lead Cerdip (Q) Package 16-Lead Plastic SO (R) Package Revision History Location 11/01 Data Sheet changed from REV REV. C. Edits to FEATURES . . . . . . . . . . . . . . ...

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