- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375236 > AD734 (Analog Devices, Inc.) 10 MHz, 4-Quadrant Multiplier/Divider(10MHz,四象限乘法器/除法器) PDF資料下載
參數(shù)資料
| 型號： | AD734 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10 MHz, 4-Quadrant Multiplier/Divider(10MHz,四象限乘法器/除法器) |
| 中文描述： | 10兆赫，四象限乘法器/除法器（10MHz的，四象限乘法器/除法器） |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AD734 |
AD734
REV. B
–6–
T able I. Component Values for Setting Up Nonstandard
Denominator Values
Denominator
R1 (Fixed)
R1 (Variable)
R2
5 V
3 V
2 V
1 V
34.8 k
64.9 k
86.6 k
174 k
20 k
20 k
50 k
100 k
120 k
220 k
300 k
620 k
T he denominator can also be current controlled, by grounding
Pin 3 (U0) and withdrawing a current of Iu from Pin 4 (U1).
T he 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 Pins 3 through 5 actually extends from 4 V to
36 V below VP, so it is not necessary to restrict the connection
of U0 to ground if it should be desirable to use some other
voltage.
T he output ER may also be buffered, re-scaled 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 Fig-
ure 12, where a fixed numerator of 10 V is generated for a di-
vider application. T here, Y
2
is tied to VN but Y
1
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 Specifications T able).
OPE RAT ION AS A MULT IPLIE R
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. T he only precaution to be noted in this regard
is that in the AD534, Pins 3, 5, 9, and 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 alter-
native connections (see Direct Denominator Control, page 5).
Operation from supplies down to
±
8 V is possible. T he supply
current is essentially independent of voltage. As is true of all
high speed circuits, careful power-supply decoupling is impor-
tant in maintaining stability under all conditions of use. T he
decoupling capacitors should always be connected to the load
ground, since 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.
Standard Multiplier Connections
Figure 5 shows the basic connections for multiplication. T he 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 may be reversed (to facilitate
interfacing with signals of a particular polarity, while achieving
some desired output polarity) or both may be driven.
T he AD734 has an input resistance of 50 k
±
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
μ
F provides a HP corner frequency
1
2
3
4
5
6
7
10
8
9
11
13
12
14
W
ER
VN
VP
DD
Z1
Z2
X1
X2
U1
U2
U0
Y1
Y2
AD734
NC
NC
LOAD
GROUND
0.1μF
0.1μF
X – INPUT
±
10V FS
Y – INPUT
±
10V FS
+15V
–15V
OPTIONAL
SUMMING INPUT
±
10V FS
W =(X
1
– X
2
)
10V
(Y
1
– Y
2
)
+ Z
2
L
L
Z
Figure 5. Basic Multiplier Circuit
of 32 Hz. When a tighter control of this frequency is needed, or
when the HP corner is above about 100 kHz, an external resis-
tor should be added across the pair of input nodes.
At least one of the two inputs of any pair must be provided with
a dc path (usually to ground). T he careful selection of ground
returns is important in realizing the full accuracy of the AD734.
T he Z2 pin will normally be connected to the load ground,
which may be remote, in some cases. It may also be used as an
optional summing input (see Equations (3) and (4), above)
having a nominal FS input of
±
10 V and the full 10 MHz
bandwidth.
In applications where high absolute accuracy is essential, the
scaling error caused by the finite resistance of the signal
source(s) may be troublesome; for example, a 50
source
resistance at just one input will introduce a gain error of –0.1%;
if both the X - and Y-inputs are driven from 50
sources, the
scaling error in the product will be –0.2%. Provided the source
resistance(s) are known, this gain error can be completely
compensated by including the appropriate resistance (50
or
100
, respectively, in the above cases) between the output W
(Pin 12) and the Z1 feedback input (Pin 11). If Rx is the total
source resistance associated with the X 1 and X 2 inputs, and Ry
is the total source resistance associated with the Y1 and Y2
inputs, and neither Rx nor Ry exceeds 1 k
, a resistance of
Rx+Ry in series with pin Z1 will provide the required gain
restoration.
Pins 9 (ER) and 13 (DD) should be left unconnected in this
application. T he U-inputs (Pins 3, 4 and 5) are shown
connected to ground; they may alternatively be connected to
VN, if desired. In applications where Pin 2 (X 2) happens to be
driven with a high-amplitude, high-frequency signal, the
capacitive coupling to the denominator control circuitry via an
ungrounded Pin 3 can cause high-frequency distortion. However,
the AD734 can be operated without modification in an AD534
socket, and these three pins left unconnected, with the above
caution noted.
+15V
1
2
3
4
5
6
7
10
8
9
11
13
12
14
W
ER
VN
VP
DD
Z1
Z2
X1
X2
U1
U2
U0
Y1
Y2
AD734
NC
NC
0.1μF
0.1μF
X – INPUT
±
10V FS
Y – INPUT
±
10V FS
–15V
I
W
=(X
1
– X
2
)
10V
(Y
1
– Y
2
)
1
1
50k
R
S
R
S
±
10V MAXIMUM
LOAD VOLTAGE
±
10mA MAX FS
L
L
L
L
I
W
Figure 6. Conversion of Output to a Current
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD73511 | Low-Power CMOS Analog Front End with Flash based DSP Microcomputer(帶閃速DSP微計算機的單模擬前端) |
| AD7392 | Parallel Input Micropower 10- and 12-Bit DACs(并行輸入微功耗12位D/A轉(zhuǎn)換器) |
| AD7395 | +3 V, Dual, Serial Input 12-/10-Bit DACs |
| AD7395AN | +3 V, Dual, Serial Input 12-/10-Bit DACs |
| AD7395AR | +3 V, Dual, Serial Input 12-/10-Bit DACs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD73411 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Power Analog Front End with DSP Microcomputer |
| AD73411BB-40 | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 119-Pin BGA 制造商:Rochester Electronics LLC 功能描述:ANALOG FRONT-END PROCESSOR +DSP I.C. - Bulk |
| AD73411BB-80 | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 119-Pin BGA 制造商:Rochester Electronics LLC 功能描述:ANALOG FRONT-END PROCESSOR +DSP I.C. - Bulk |
| AD7341JN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD7341JP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。