LTC2607 LINER [Linear Technology], LTC2607 Datasheet - Page 22

• Manufacturer Part Number: LTC2607
• Manufacturer: LINER [Linear Technology]

LTC2633
operation
Board Layout
The PC board should have separate areas for the analog and
digital sections of the circuit. A single, solid ground plane
should be used, with analog and digital signals carefully
routed over separate areas of the plane. This keeps digital
signals away from sensitive analog signals and minimizes
the interaction between digital ground currents and the
analog section of the ground plane. The resistance from
the LTC2633 GND pin to the ground plane should be as
low as possible. Resistance here will add directly to the
effective DC output impedance of the device (typically
0.1Ω). Note that the LTC2633 is no more susceptible to
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.
package Description
22
3.85 MAX
0.20 BSC
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
2.62 REF
DATUM ‘A’
RECOMMENDED SOLDER PAD LAYOUT
MAX
0.40
PER IPC CALCULATOR
0.30 – 0.50 REF
0.65
REF
(Reference LTC DWG # 05-08-1637 Rev A)
1.22 REF
1.4 MIN
8-Lead Plastic TSOT-23
0.09 – 0.20
(NOTE 3)
TS8 Package
2.80 BSC
1.00 MAX
1.50 – 1.75
(NOTE 4)
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
analog ground, digital ground, and power ground. When
the LTC2633 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.
0.80 – 0.90
0.65 BSC
PIN ONE ID
2.90 BSC
(NOTE 4)
1.95 BSC
TS8 TSOT-23 0710 REV A
0.01 – 0.10
0.22 – 0.36
8 PLCS (NOTE 3)
2633fb