AD660SQ/883B AD [Analog Devices], AD660SQ/883B Datasheet - Page 12

• Manufacturer Part Number: AD660SQ/883B
• Description: Monolithic 16-Bit Serial/Byte DACPORT
• Manufacturer: AD [Analog Devices]

AD660
GROUNDING
The AD660 has two pins, designated analog ground (AGND)
and digital ground (DGND.) The analog ground pin is the
“high quality” ground reference point for the device. Any exter-
nal loads on the output of the AD660 should be returned to
analog ground. If an external reference is used, this should also
be returned to the analog ground.
If a single AD660 is used with separate analog and digital
ground planes, connect the analog ground plane to AGND and
0.200 (5.05)
0.125 (3.18)
0.200 (5.08)
0.125 (3.18)
(5.33)
0.210
MAX
(5.08)
0.200
PIN 1
MAX
PIN 1
0.0118 (0.30)
0.0040 (0.10)
0.005 (0.13) MIN
PIN 1
0.022 (0.558)
0.014 (0.356)
0.023 (0.58)
0.014 (0.36)
2
4
24
1
1
2
4
1
Dimensions shown in inches and (mm).
0.100
(2.54)
0.0500
0.6141 (15.60)
0.5985 (15.20)
(1.27)
BSC
24-Lead Small Outline (SOIC)
BSC
(2.54)
0.100
BSC
OUTLINE DIMENSIONS
1.275 (32.30)
1.125 (28.60)
1.060 (26.92) MAX
24-Lead Plastic DIP
24-Lead Cerdip
0.0192 (0.49)
0.0138 (0.35)
–12–
N-24
Q-24
R-24
12
13
0.070 (1.77)
0.045 (1.15)
the digital ground plane to DGND keeping lead lengths as short
as possible. Then connect AGND and DGND together at the
AD660. If multiple AD660s are used or the AD660 shares ana-
log supplies with other components, connect the analog and
digital returns together once at the power supplies rather than at
each chip. This single interconnection of grounds prevents large
ground loops and consequently prevents digital currents from
flowing through the analog ground.
0.0125 (0.32)
0.0091 (0.23)
0.070 (1.78)
0.030 (0.76)
0.2992 (7.60)
0.2914 (7.40)
0.1043 (2.65)
0.0926 (2.35)
0.098 (2.49) MAX
0.4193 (10.65)
0.3937 (10.00)
13
12
12
1
3
0.280 (7.11)
0.240 (6.10)
0.060 (1.52)
0.015 (0.38)
SEATING
PLANE
8
0
0.310 (7.87)
0.220 (5.59)
0.060 (1.52)
0.015 (0.38)
°
°
SEATING
PLANE
0.150
(3.81)
MIN
0.0291 (0.74)
0.0098 (0.25) x 45
0.150
(3.81)
MIN
0.0500 (1.27)
0.0157 (0.40)
0.015 (0.381)
0.008 (0.204)
0.325 (8.25)
0.300 (7.62)
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
15
0
°
°
°
0.195 (4.95)
0.115 (2.93)
REV. A