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| 型號： | EVAL-AD7719EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7719 |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 2 |
| 位數(shù)： | 16，24 |
| 采樣率（每秒）： | 105 |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | 2 Vpp |
| 在以下條件下的電源（標準）： | 4.85mW @ 105SPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7719 |
| 已供物品： | 板 |
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REV. A
AD7719
–13–
Both Channels
The operation of the aux channel is identical to the main
channel with the exception that there is no PGA on the aux
channel. The input chopping is incorporated into the input
multiplexer while the output chopping is accomplished by an
XOR gate at the output of the modulator. The chopped modulator
bit stream is applied to a Sinc
3 filter. The programming of the
Sinc
3 decimation factor is restricted to an 8-bit register SF; the
actual decimation factor is the register value times 8. The
decimated output rate from the Sinc
3 filter (and the ADC
conversion rate) will therefore be
f
SF
f
ADC
MOD
=×
×
×
1
3
1
8
where:
fADC is the ADC update rate.
SF is the decimal equivalent of the word loaded to the
filter register.
fMOD is the modulator sampling rate of 32.768 kHz.
Programming the filter register determines the update rate for
both the main and aux ADC. Both ADCs operate with the same
update rate.
The chop rate of the channel is half the output data rate.
The frequency response of the filter H (f) is as follows:
1
8
81
2
3
SF
f f
ff
MOD
OUT
×
×× ×
×
××
×
sin (
/
)
sin (
/
)
sin (
/
)
sin (
/
)
π
where:
fMOD = 32,768 Hz
SF = value programmed into SF SFR.
fOUT = fMOD/(SF
× 8 × 3)
The following shows plots of the filter frequency response for
the SF words shown in Table I. The overall frequency response
is the product of a Sinc
3 and a sinc response. There are Sinc3
notches at integer multiples of 3
× fADC and there are sinc notches
SINC3 FILTER
MUX
-
MOD1
XOR
ANALOG
INPUT
DIGITAL
OUTPUT
(8
SF )
3
1
2
AIN + VOS
AIN – VOS
fCHOP
fMOD
fCHOP
fADC
1
8
SF
3
(
)
Figure 5. Auxiliary ADC Channel Block Diagram
at odd integer multiples of fADC/2. The 3 dB frequency for all
values of SF obeys the following equation:
fdB
f
ADC
30 24
() =×
.
The signal chain is chopped as shown in Figures 4 and 5. The
chop frequency is
f
CHOP
ADC
=
2
As shown in the block diagram, the Sinc
3 filter outputs alternately
contain +VOS and –VOS, where VOS is the respective channel
offset. This offset is removed by performing a running average
of 2. This average by 2 means that the settling time to any change
in programming of the ADC will be twice the normal conversion
time, while an asynchronous step change on the analog input will
not be fully reflected until the third subsequent output.
t
f
t
SETTLE
ADC
=
=×
2
The allowable range for SF is 13 to 255, with a default of 69
(0x45). The corresponding conversion rates, conversion times,
and settling times are tabulated in Table I. Note that the con-
version time increases by 0.732 ms for each increment in SF.
Table I. ADC Conversion and Settling Times for Various
SF Words
SF
Data Update Rate
Settling Time
Word
fADC (Hz)
tSETTLE (ms)
13
105.3
19.04
69 (Default)
19.79
101.07
255
5.35
373.54
Normal mode rejection is the major function of the digital filter
on the AD7719. The normal mode 50 Hz ± 1 Hz rejection with an
SF word of 82 is typically –100 dB. The 60 Hz ± 1 Hz rejec-
tion with SF = 68 is typically –100 dB. Simultaneous 50 Hz and
60 Hz rejection of better than 60 dB is achieved with an SF of
69. Choosing an SF word of 69 places notches at both 50 Hz
and 60 Hz. Figures 6 to 9 show the filter rejection for a selec-
tion of SF words.
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