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參數(shù)資料
| 型號(hào)： | AD776 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit 100 kSPS Oversampling ADC(16位100kSPS過采樣A/D轉(zhuǎn)換器) |
| 中文描述： | 16位100 kSPS的采樣ADC的（16位100ksps的過采樣的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 257K |
| 代理商： | AD776 |
AD776
REV. A
–7–
1.0
–1.0
60
–0.4
–0.8
12
–0.6
0
0.2
–0.2
0.0
0.4
0.6
0.8
48
36
24
FREQUENCY – kHz
L
Figure 6. FIR Filter, Compensation Function
T he passband and stopband frequencies of both the comb and
FIR filters scale linearly with the CLK IN frequency, as shown
in T able I.
T able I. FIR and Comb Filter Characteristics
CLKIN
(MHz)
Passband
(kHz)
Stopband
(kHz)
12.8
12.288
11.2896
10.0
6.4
45.5
43.7
40.1
35.5
24.6
50
48
44.1
39.1
27.1
ANALOG INPUT
T he input to the AD776, as previously described in the discus-
sion of the analog front end, uses a switched-capacitor struc-
ture. As a result, the input impedance of AIN+ and AIN– will
vary with clock frequency. T able II gives the typical analog in-
put impedance for some common CLK IN frequencies. T he
input impedance is equal to
≈
10
12
/3f
CLK IN
, where f
CLK IN
is the
input clock rate.
T able II. Analog Input Impedance
Output
Sample
Rate (kHz)
(FIR Filter Mode)
Analog
Input
Impedance
(k
V
)
Input
Clock Rate
(MHz)
12.8
6.4
6.144
5.6448
100
50
48
44.1
26
52
54.3
59
T he AD776 is designed to accept input signals of (2
×
V
REF
)
–0.5 V which can be centered at various dc offsets (common-
mode inputs) as long as the signal peaks are bounded
by +4.0 V
and 0 V. Signal peaks outside this range will result in signal
clipping and increased distortion products.
Capacitive coupling between the CLK IN and AIN pins can
cause degradation to dynamic performance. Special care
should be taken with respect to the layout of the clock and
analog inputs.
T he attenuation characteristics of the comb filter are shown in
Figure 4. As illustrated, the frequency response in the passband
region exhibits a nonflat behavior. In the 400 kHz mode, the
output of the comb filter provides conversion data. T he dy-
namic range is equivalent to approximately 72 dB, or 12 bits, in
this mode. In the 16-bit/100 kHz mode, the comb filter serves
as the input to the FIR filter. T he FIR filter compensates for the
passband roll-off of the comb filter and provides the final sharp
cutoff required for stopband attenuation, removing the out-of-
band noise components while partially serving as the system
antialiasing filter.
0
–100
1600
–70
–90
200
–80
0
–40
–60
–50
–30
–20
–10
1400
1200
1000
800
600
FREQUENCY – kHz
400
L
Figure 4. Comb Filter Response
Figure 5 illustrates the low-pass response of the FIR filter and
Figure 6 shows the compensation function of the filter. T he
255-tap FIR filter is low-pass with 9%
transition-band, and with
a CLK IN frequency of 12.8 MHz has a 45.5 kHz passband cut-
off frequency, 50 kHz stopband frequency, 0.001 dB passband
ripple, and a stopband ripple of 96 dB.
0
–120
200
–96
0
–48
–72
–24
160
120
80
40
FREQUENCY – kHz
L
0
45.5kHz
0.001dB
PASSBAND RIPPLE
Figure 5. FIR Filter, Low-Pass Response
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