AD7607 Analog Devices, AD7607 Datasheet - Page 26

• Manufacturer Part Number: AD7607
• Description: 8-Channel DAS with 14-Bit, Bipolar, Simultaneous Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7607

• Resolution (bits): 14bit
• # Chan: 8
• Sample Rate: 200kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: SE-Bip
• Ain Range: Bip 10V,Bip 5.0V
• Adc Architecture: SAR
• Pkg Type: QFP

AD7607
DIGITAL FILTER
The AD7607 contains an optional first-order digital sinc filter that
should be used in applications where slower throughput rates are
used and digital filtering is required. The oversampling ratio of
the digital filter is controlled using the oversampling pins, OS[2:0]
(see Table 9). OS 2 is the MSB control bit, and OS 0 is the LSB
control bit. Table 9 lists the oversampling bit decoding to select the
Table 9. Oversample Bit Decoding
OS[2:0]
000
001
010
011
100
101
110
111
Oversampling Ratio
No oversampling
2
4
8
16
32
64
Invalid
CONVST A
CONVST B
BUSY
OS x
AND
3 dB BW, 5 V Range (kHz)
15
15
13.7
10.3
6
3
1.5
t
OS_SETUP
CONVERSION N
Figure 43. OS x Pin Timing
OVERSAMPLE RATE
LATCHED FOR CONVERSION N + 1
Rev. B | Page 26 of 32
t
OS_HOLD
3 dB BW, 10 V Range (kHz)
22
22
18.5
11.9
6
3
1.5
different oversample rates. The OS pins are latched on the falling
edge of BUSY. This sets the oversampling rate for the next
conversion (see Figure 43).
Selection of the oversampling mode has the effect of adding
a digital filter function after the ADC. The different oversampling
rates and the CONVST x sampling frequency produce different
digital filter frequency profiles.
CONVERSION N + 1
Maximum Throughput,
CONVST Frequency (kHz)
200
100
50
25
12.5
6.25
3.125
Data Sheet