PS398ESE Pericom Semiconductor, PS398ESE Datasheet - Page 10

• Manufacturer Part Number: PS398ESE
• Description: IC MULTIPLEXER 8X1 16SOIC
• Manufacturer: Pericom Semiconductor

Specifications of PS398ESE

• Function: Multiplexer
• Circuit: 1 x 8:1
• On-state Resistance: 100 Ohm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 3 V ~ 15 V, ±3 V ~ 8 V
• Current - Supply: 1µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
The table below shows how many time constants (m ) are
needed to reach an accuracy of one LSB.
Now, let’s calculate what the maximum sampling rate for the
PS398. Assume a 12-bit accuracy and room temperature
operation.
Bits
12
15
8
Accuracy (%)
0.25
0.012
0.0017
Figure 10. Equivalent model of one multiplexer channel
11
m
6
9
= R
R
ON
S
V
S
x C
COM(ON)
V
IN
C
COM
1 0
Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
R
(ON)
In equation (1) above, n = 8, t
Assuming a x4 oversampling rate, the maximum sampling speed
for the PS398 would be 630 4 = 157kHz.
ON
= 100ohm x 54pF
f
S
=
8 [150ns + 9(100ohm x 54pF)]
or f
_______________________ ,
S
C
= 630kHz.
L
1
TRANS
= 150ns, t
SETTLING
PS398/PS399
PS8185F
= 9 ,
09/28/04