LTC1408 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1408' PDF : 20 Pages View PDF
LTC1408
TYPICAL PERFOR A CE CHARACTERISTICS VDD = 3V, TA = 25°C
Simultaneous Step at all 6 Channels
from 25Ω Source Sampling
Frequency = 625ksps
Input Frequency = 625.0381MHz
16384
14336
12288
CH0 THRU CH5
RISING
10240
8192
6144
4096
2048
CH0 THRU CH5
FALLING
0
–5 0
5 10 15
TIME (ns)
20 25
1408 G22
PSRR vs Frequency
0
–20
–40
–60
–80
–100
–120
100 1k 10k 100k 1M 10M 100M 1G
FREQUENCY (Hz)
1408 G23
PI FU CTIO S
SDO (Pin 1): Three-State Serial Data Output. Each set of
six output data words represent the six analog input
channels at the start of the previous conversion. Data for
CH0 comes out first and data for CH5 comes out last. Each
data word comes out MSB first.
OGND (Pin 2): Ground Return for SDO Currents. This pad
must always be within 300mV of the ground plane poten-
tial.
OVDD (Pin 3): Power Supply for the SDO Pin. OVDD must
be no more than 300mV higher than VDD and can be
brought to a lower voltage to interface to low voltage logic
families. The unloaded high state at SDO is at the potential
of OVDD.
CH0+ (Pin 4): Non-Inverting Channel 0. CH0+ operates
fully differentially with respect to CH0– with a 0V to 2.5V,
or ±1.25V differential swing and a 0V to VDD absolute
input range.
CH0– (Pin 5): Inverting Channel 0. CH0– operates fully
differentially with respect to CH0+ with a –2.5V to 0V,
or ±1.25V differential swing and a 0V to VDD absolute
input range.
GND (Pins 6, 9, 12, 13, 16, 19): Analog Grounds. These
ground pins must be tied directly to the solid ground plane
under the part. Analog signal currents flow through these
connections.
CH1+ (Pin 7): Non-Inverting Channel 1. CH1+ operates
fully differentially with respect to CH1– with a 0V to 2.5V,
or ±1.25V differential swing and a 0V to VDD absolute
input range.
CH1– (Pin 8): Inverting Channel 1. CH1– operates fully
differentially with respect to CH1+ with a –2.5V to 0V,
or ±1.25V differential swing and a 0V to VDD absolute
input range.
CH2+ (Pin 10): Non-Inverting Channel 2. CH2+ operates
fully differentially with respect to CH2– with a 0V to 2.5V,
or ±1.25V differential swing and a 0V to VDD absolute
input range.
CH2– (Pin 11): Inverting Channel 2. CH2– operates fully
differentially with respect to CH2+ with a –2.5V to 0V, or
±1.25V differential swing and a 0V to VDD absolute
input range.
1408fa
7
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