参数资料
| 型号： | AD734BQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLIER 4-QUADRANT 14-CDIP |
| 标准包装： | 1 |
| 功能： | 模拟乘法器 |
| 位元/级数： | 四象限 |
| 封装/外壳： | 14-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-CERDIP |
| 包装： | 管件 |
AD734
Rev. E | Page 16 of 20
is sufficient gain to raise the amplitude of EIN to that required to
establish an output amplitude of EC over the range of 1 V to 10 V.
The X input of the AD734, which has finite offset voltage, can be
troublesome at the output at high gains. The output offset is
reduced to that of the X input (1 mV or 2 mV) by the offset
loop comprising R3, C3, and Buffer A1. The low-pass corner
frequency of 0.16 Hz is transformed to a high-pass corner that is
multiplied by the gain (for example, 160 Hz at a gain of 1000).
In applications not requiring operation down to low frequencies,
Amplifier A1 can be eliminated, but the AD734’s input resistance
of 50 kΩ between X1 and X2 reduces the time constant and
increases the input offset. Using a nonpolar 20 mF tantalum
capacitor for C1 results in the same unity-gain high-pass corner; in
this case, the offset gain increases to 20, which is still acceptable.
Figure 33 shows the error in the output for sinusoidal inputs at
100 Hz, 100 kHz, and 1 MHz, with EC set to 10 V. The output
error for any frequency between 300 Hz and 300 kHz is similar
to that for 100 kHz. At low signal frequencies and low input
amplitudes, the dynamics of the control loop determine the gain
error and distortion; at high frequencies, the 200 MHz gain-
bandwidth product of the AD734 limits the available gain.
The output amplitude tracks EC over the range of 1 V to slightly
more than 10 V.
INPUT AMPLITUDE (V)
E
RRO
R
(
d
B)
2
1
0
–1
–2
0.01
0.1
1
10
0
082
7-
016
100kHz
100Hz
1MHz
Figure 33. AGC Amplifier Output Error vs. Input Voltage
WIDEBAND RMS-TO-DC CONVERTER USING U
INTERFACE
The AD734 is well-suited to such applications as implicit rms-
to-dc conversion, where the AD734 implements the function
[]
RMS
IN
RMS
V
2
avg
=
(13)
using its direct divide mode. Figure 34 shows the circuit.
AD734
X1
1
X2
2
U0
3
U1
4
U2
5
VP 14
DD 13
W 12
Z1 11
Z2 10
Y2
7
ER 9
VN 8
Y1
6
+15V
U2b
1/2
AD708
1/2
AD708
–15V
0.1F
00
82
7-
01
7
L
C1
47F
C2
1F
VIN
R1
3.32k
U2a
L
VO = VIN2
Figure 34. A Two-Chip, Wideband RMS-to-DC Converter
In this application, the AD734 and an AD708 dual op amp
serve as a two-chip rms-to-dc converter with a 10 MHz
bandwidth. Figure 35 shows the circuit’s performance for
square-, sine-, and triangle-wave inputs. The circuit accepts
signals as high as 10 V p-p with a crest factor of 1 or 1 V p-p
with a crest factor of 10. The circuit’s response is flat to 10 MHz
with an input of 10 V, flat to almost 5 MHz for an input of 1 V,
and to almost 1 MHz for inputs of 100 mV. For accurate
measurements of input levels below 100 mV, the AD734’s
output offset (Z interface) voltage, which contributes a dc error,
must be trimmed out.
In the circuit shown in Figure 34, the AD734 squares the input
signal, and its output (VIN2) is averaged by a low-pass filter that
consists of R1 and C1 and has a corner frequency of 1 Hz. Because
of the implicit feedback loop, this value is both the output value,
VRMS, and the denominator in Equation 13. U2a and U2b, an
AD708 dual dc precision op amp, serve as unity-gain buffers,
supplying both the output voltage and driving the U interface.
INPUT FREQUENCY (Hz)
O
UT
P
UT
V
O
LT
AG
E
(V
)
100
10
1
100m
1m
10m
100
10k
100k
1M
10M
0
08
27-
018
SQUARE WAVE
SINE WAVE
TRI-WAVE
Figure 35. RMS-to-DC Converter Performance
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD734SCHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:10 MHz, 4-Quadrant Multiplier/Divider |
| AD734SQ | 制造商:AD 制造商全称:Analog Devices 功能描述:10 MHz, Four-Quadrant Multiplier/Divider |
| AD734SQ/883B | 功能描述:增效器/分频器 ANALOG MULTIPLIER IC RoHS:否 制造商:Texas Instruments 产品:Multiplier 逻辑系列: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:Through Hole 封装 / 箱体:PDIP-14 |
| AD7352 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC |
| AD7352BRUZ | 功能描述:IC ADC DUAL 12BIT 3MSPS 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
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