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| 型號： | AD734ANZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 0K |
| 描述： | IC MULT/DIV 4-QUADRANT 14-DIP |
| 標準包裝： | 25 |
| 功能： | 模擬乘法器 |
| 位元/級數(shù)： | 四象限 |
| 封裝/外殼： | 14-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 14-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 789 (CN2011-ZH PDF) |
AD734
Rev. E | Page 12 of 20
This error is not important in some closed-loop applications,
such as automatic gain control (AGC), but clearly is not acceptable
where the denominator value must be well-defined. When it is
required to set up an accurate, fixed value of U, the on-chip
reference can be used. The transistor Qr is provided to cancel
the VBE of Qu, and is biased by an external resistor, R2, as shown
in Figure 23. R1 is chosen to set the desired value of U and
consists of a fixed and adjustable resistor.
4
14
9
13
8
U0
Iu
Qu
NC
Qr
Ru
28k
Rr
100k
VP
VN
DD
ER
NC
+VS
~60A
–VS
U1
U2
AD734
00
82
7-
0
5
VG
+
–
3
5
Figure 22. Low Accuracy Denominator Control
4
14
9
13
8
U0
Iu
Qu
NC
Qr
Ru
28k
Rr
100k
VP
VN
DD
R2
ER
+VS
–VS
U1
U2
AD734
00
827-
00
6
3
5
R1
NOM
8V
Figure 23. Connections for a Fixed Denominator
Table 5 shows useful values of the external components for
setting up nonstandard denominator values.
Table 5. Component Values for Setting Up Nonstandard
Denominator Values
Denominator
R1 (Fixed)
R1 (Variable)
R2
5 V
34.8 kΩ
20 kΩ
120 kΩ
3 V
64.9 kΩ
20 kΩ
220 kΩ
2 V
86.6 kΩ
50 kΩ
300 kΩ
1 V
174 kΩ
100 kΩ
620 kΩ
The denominator can also be current controlled, by grounding
Pin 3 (U0) and withdrawing a current of Iu from Pin 4 (U1).
The nominal scaling relationship is U = 28 × Iu, where u is
expressed in volts and Iu is expressed in milliamps. Note,
however, that while the linearity of this relationship is very
good, it is subject to a scale tolerance of ±20%. Note that the
common-mode range on Pin 3 through Pin 5 actually extends
from 4 V to 36 V below VP; therefore, it is not necessary to
restrict the connection of U0 to ground to use some other
voltage.
The output ER can also be buffered, rescaled, and used as a
general-purpose reference voltage. It is generated with respect
to the negative supply line, Pin 8 (VN), but this is acceptable
when driving one of the signal interfaces. An example is shown
in Figure 31, where a fixed numerator of 10 V is generated for a
divider application. Y2 is tied to VN, but Y1 is 10 V above this;
therefore, the common-mode voltage at this interface is still 5 V
above VN, which satisfies the internal biasing requirements (see
Table 1).
OPERATION AS A MULTIPLIER
All of the connection schemes used in this section are essentially
identical to those used for the AD534, with which the AD734 is
pin compatible. The only precaution to be noted in this regard
is that in the AD534, Pin 3, Pin 5, Pin 9, and Pin 13 are not
internally connected, and Pin 4 has a slightly different purpose.
In many cases, an AD734 can be directly substituted for an
AD534 with immediate benefits in static accuracy, distortion,
feedthrough, and speed. Where Pin 4 was used in an AD534
application to achieve a reduced denominator voltage, this
function can now be much more precisely implemented with
the AD734 using alternative connections (see the Direct
Denominator Control section).
Operation from supplies down to ±8 V is possible. The supply
current is essentially independent of voltage. As is true of all
high speed circuits, careful power supply decoupling is important
in maintaining stability under all conditions of use. The decoupling
capacitors should always be connected to the load ground,
because the load current circulates in these capacitors at high
frequencies. Note the use of the special symbol (a triangle with
the letter L inside it) to denote the load ground (see Figure 24).
Standard Multiplier Connections
Figure 24 shows the basic connections for multiplication. The X
and Y inputs are shown as optionally having their negative nodes
grounded, but they are fully differential, and in many applications
the grounded inputs can be reversed (to facilitate interfacing
with signals of a particular polarity, while achieving some desired
output polarity) or both can be driven.
The AD734 has an input resistance of 50 kΩ ± 20% at the X, Y,
and Z interfaces, which allows ac coupling to be achieved with
moderately good control of the high-pass (HP) corner frequency;
a capacitor of 0.1 μF provides a HP corner frequency of 32 Hz.
When a tighter control of this frequency is needed, or when the
HP corner is above about 100 kHz, an external resistor should
be added across the pair of input nodes.
AD734
X1
1
X2
2
U0
3
U1
4
U2
5
VP 14
DD
NC
13
W 12
Z1 11
Z2 10
Y2
7
ER 9
VN 8
Y1
6
L
X INPUT
±10V FS
Y INPUT
±10V FS
+15V
Z2
–15V
0.1F
LOAD
GROUND
OPTIONAL
SUMMING INPUT
±10V FS
W =
+ Z2
(X1 – X2)(Y1 –Y2)
10V
00
82
7
-00
7
Figure 24. Basic Multiplier Circuit
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