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參數(shù)資料
| 型號(hào)： | AD2S83IPZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV R/D MONO VAR RES 44PLCC |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 類型： | R/D 轉(zhuǎn)換器 |
| 輸入類型： | 并聯(lián) |
| 輸出類型： | 數(shù)字 |
| 接口： | 并聯(lián) |
| 電流 - 電源： | 30mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 44-PLCC（16.59x16.59） |
| 包裝： | 帶卷 (TR) |
AD2S83
–13–
REV. E
During the VCO reset period the input continues to be inte-
grated. The reset period is constant at 40 ns.
The VCO rate is fixed for a given input current by the VCO
scaling factor:
= 8.5 kHz/
A
The tracking rate in rps per
A of VCO input current can be
found by dividing the VCO scaling factor by the number of LSB
changes per rev (i.e., 4096 for 12-bit resolution).
The input resistor R6 determines the scaling between the con-
verter velocity signal voltage at the INTEGRATOR OUTPUT
pin and the VCO input current. Thus to achieve a 5 V output at
100 rps (6000 rpm) and 12-bit resolution the VCO input cur-
rent must be:
(100
× 4096)/(8500) = 48.2 A
Thus, R6 would be set to: 5/(48.2
× 10–6) = 103.7 k
The velocity offset voltage depends on the VCO input resistor,
R6, and the VCO bias current and is given by
Velocity Offset Voltage = R6
× (VCO bias current)
The temperature coefficient of this offset is given by
Velocity Offset Tempco = R6
× (VCO bias current tempco)
where the VCO bias current tempco is typically +0.22 nA/
°C.
The maximum recommended rate for the VCO is 1.1 MHz
which sets the maximum possible tracking rate.
Since the minimum voltage swing available at the integrator
output is
±8 V, this implies that the minimum value for R6 is
62 k
. As
Max Current
A
Min Value R
k
=
×
=
×
=
11 10
85 10
129
6
8
129 10
62
6
3
6
.
–
Transfer Function
By selecting components using the method outlined in the sec-
tion “Component Selection,” the converter will have a critically
damped time response and maximum phase margin. The
Closed-Loop Transfer Function is given by:
θ
OUT
θ
IN
=
14 (1
+ s
N )
( s
N + 2.4 ) ( sN
2 + 3.4 s
N + 5.8 )
where, sN, the normalized frequency variable is given by:
s
N =
2
π
s
f BW
and fBW is the closed-loop 3 dB bandwidth (selected by the
choice of external components).
The acceleration constant KA, is given approximately by
K
A = 6 × ( f BW )
2
sec
–2
The normalized gain and phase diagrams are given in Figures 5
and 6.
FREQUENCY – fBW
12
–12
GAIN
PLOT
9
0
–3
–6
–9
6
3
0.0
2
0.04
0.1
0.2
0.4
1
Figure 5. Gain Plot
FREQUENCY – fBW
180
–180
PHASE
PLOT
135
0
–45
–90
–135
90
45
0.0
2
0.04
0.1
0.2
0.4
1
Figure 6. Phase Plot
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