LTC2635-HMI10 LINER [Linear Technology], LTC2635-HMI10 Datasheet - Page 26

• Manufacturer Part Number: LTC2635-HMI10
• Manufacturer: LINER [Linear Technology]

V
LTC2635
operation
this effect than any other parts of this type; on the con-
trary, it allows layout-based performance improvements
to shine rather than limiting attainable performance with
excessive internal resistance.
Another technique for minimizing errors is to use a sepa-
rate power ground return trace on another board layer.
The trace should run between the point where the power
supply is connected to the board and the DAC ground pin.
Thus the DAC ground pin becomes the common point for
SDA
SCL

OUT
START
X = DON’T CARE
A6
A6
1
A5
A5
2
A4
A4
3
SLAVE ADDRESS
A3
A3
4
A2
A2
5
Figure 4. Typical LTC2635 Input Waveform—Programming DAC Output for Full-Scale
A1
A1
6
A0
A0
7
W
W
8
ACK
9
C3
C3
1
C2
C2
2
COMMAND/ADDRESS
C1 C0 A3
C1 C0 A3
3
4
5
A2
A2
6
A1
A1
7
A0
A0
8
ACK
9
D11 D10 D9 D8 D7 D6
1
2
analog ground, digital ground, and power ground. When
the LTC2635 is sinking large currents, this current flows
out the ground pin and directly to the power ground trace
without affecting the analog ground plane voltage.
It is sometimes necessary to interrupt the ground plane
to confine digital ground currents to the digital portion
of the plane. When doing this, make the gap in the plane
only as long as it needs to be to serve its purpose and
ensure that no traces cross over the gap.
3
MS DATA
4
5
6
D5 D4
7
8
ACK
9
D3
1
D2
2
D1 D0
3
LS DATA
4
X
5
X
6
7
X
8
X
ACK
9
FULL-SCALE
VOLTAGE
ZERO-SCALE
VOLTAGE
STOP
2635fb
2635 F04