AD7608 Analog Devices, AD7608 Datasheet - Page 31

• Manufacturer Part Number: AD7608
• Description: 8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7608

• Resolution (bits): 18bit
• # Chan: 8
• Sample Rate: 200kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: Diff-Bip
• Ain Range: Bip 10V,Bip 5.0V
• Adc Architecture: SAR
• Pkg Type: QFP

Data Sheet
To ensure good device-to-device performance matching, in a
system that contains multiple AD7608 devices, a symmetrical
layout between the AD7608 devices is important.
Figure 61 shows a layout with two devices. The AV
plane runs to the right of both devices. The V
track runs to the left of the two devices. The reference chip
is positioned between both the two devices and the reference
voltage track runs north to Pin 42 of U1 and south to Pin 42
to U2. A solid ground plane is used.
These symmetrical layout principles can be applied to a system
that contains more than two AD7608 devices. The AD7608
devices can be placed in a north-south direction with the reference
voltage located midway between the AD7608 devices with the
reference track running in the north-south direction similar to
Figure 61.
DRIVE
supply
CC
supply
Rev. A | Page 31 of 32
Figure 61. Layout for Multiple AD7608 Devices—Top Layer and
Supply Plane Layer
U2
U2
U1
U1
AVCC
AD7608