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AL Tech 8CH Bedienungsanleitung Seite 16

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LTC2424/LTC2428
As shown in Figure 6, an external clock of 2.051MHz
applied to the F
O
pin results in a notch frequency of 800Hz
with a data output rate of 100 samples/second.
Figure 7 shows the total unadjusted error (Offset Error +
Full-Scale Error + INL + DNL) as a function of the output
data rate with a 5V reference. The relationship between the
output data rate (ODR) and the frequency applied to the F
O
pin (F
O
) is:
ODR = F
O
/20510
Table 4 summarizes the duration of each state as a
function of F
O
.
Operation at Higher Data Output Rates
The LTC2424/LTC2428 typically operate with an internal
oscillator of 153.6kHz. This corresponds to a notch fre-
quency of 60Hz and an output rate of 7.5 samples/second.
The internal oscillator is enabled if the F
O
pin is logic LOW
(logic HIGH for a 50Hz notch). It is possible to drive the F
O
pin with an external oscillator for higher data output rates.
APPLICATIONS INFORMATION
WUU
U
OUTPUT RATE (SAMPLES/SEC)
0
TOTAL UNADJUSTED ERROR (ppm)
96
128
160
12 BITS
13 BITS
14 BITS
16 BITS
24248 F07
64
32
0
50 100
192
224
256
V
REF
= 5V
150
Figure 7. Total Error vs Output Rate (V
REF
= 5V)
LTC2424
C9
0.1µF
HCO4
HCO4
C7
10pF
C6
270pF
C8 5pF
R7 5k
R6 47k
R8 1k
10k
10 TURN POT
SWITCH
R9 1k
5V
6
12
10
5
7
3
4
21
13
11
89
24248 F06
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
V
CC
FS
SET
ADCIN
ZS
SET
GND
MUXOUT
V
CC
CH0
CH1
CH2
CH3
NC
NC
GND
GND
F
O
SCK
SDO
CSADC
GND
D
IN
CSMUX
CLK
GND
NC
GND
NC
+
Figure 6. Selectable 100 Sample/Second Turbo Mode
Table 4. LTC2424/LTC2428 State Duration
State Operating Mode Duration
CONVERT Internal Oscillator F
O
= LOW (60Hz Rejection) 133ms
F
O
= HIGH (50Hz Rejection) 160ms
External Oscillator F
O
= External Oscillator 20510/f
EOSC
(In Seconds)
with Frequency f
EOSC
kHz
(f
EOSC
/2560 Rejection)
SLEEP As Long As CSADC = HIGH Until CSADC = 0 and SCK
DATA OUTPUT Internal Serial Clock F
O
= LOW/HIGH As Long As CSADC = LOW But Not Longer Than 1.67ms
(Internal Oscillator) (32 SCK cycles)
F
O
= External Oscillator with As Long As CSADC = LOW But Not Longer Than 256/f
EOSC
ms
Frequency f
EOSC
kHz (32 SCK cycles)
External Serial Clock with As Long As CSADC = LOW But Not Longer Than 32/f
SCK
ms
Frequency f
SCK
kHz (32 SCK cycles)
MAXIMUM OUTPUT
WORD RATE (OWR)
OWR
tt
inHz
CONVERT DATAOUTPUT
=
+
1
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