AT76C001 データシートの表示（PDF） - Atmel Corporation
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AT76C001 Datasheet PDF : 9 Pages
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Application Examples (Continued)
filtered XOUT is output 4 clock cycles after the sam-
pling of the corresponding XIN input.
A 130-Tap FIR Filter in Intel Mode
Example with coefficient LSB ahead and rounding dis-
abled.
yn=c0xn + c1xn-1 + .......
+ c128xn-12 + c129xn-129
1. Firstly, unlock the microprocessor interface by writing
a zero to bit 3 (this is normally performed by applying
a Master reset).
2. Write 1010bin in the configuration register. This sets
the configuration with bit 0 selecting stop mode, bit 1
selecting Intel mode, bit 2 selecting LSB ahead, and
bit 3 locks the configuration.
3. Write the Filter Order-1 in the FILT_ORD register, i.e.
81hex
4. Write the 130 coefficients beginning with the LSB of
c0, then the MSB of c0, etc.
5. Write 11xxx in the NORM register to disable rounding
and to select bits 39 to 24 of the 40 bit internal result..
6. Write 1011bin in the Configuration register to start the
filter. At each new transition high to low on DIV input
signal, a new sample is fed into the filter. The corre-
sponding filtered sample is output 4+33 clock cycles
later and specified by a low level on DOV output sig-
nal. Here the incoming sample rate must at most be
33 times less than the circuit clock rate, where 33 rep-
resents the number of times the 4th order cell is multi-
plexed.
Electrical Specifications
Absolute Maximum Ratings
Symbol Parameter Min Max Unit
VDD
DC supply
voltage
-0.5 5.5
V
VI
DC input
voltage
-0.5
VDD+
0.5V
V
VO
DC output
voltage
-0.5
VDD+
0.5V
V
+-IIk
DC input diode
current
10 mA
+-IOk
DC output
diode current
20 mA
IOLMAX
Continuous
output current
10 mA
IOH-
MAX
Continuous
output current
10 mA
TSH
Time of outputs
shorted
5 sec
Conditions
or see +-IIk
or see +-IOk
VI<-0.5V
VI>VDD+0.5V
VO<-0.5V
VO>VDD+0.5V
Industrial
Industrial
(continued)
8
AT76C001
Absolute Maximum Ratings (Continued)
TA
Temperature
range
-40 +85
C
TSG
Storage
temperature
-65 +150 C
Industrial
Recommended Operating Conditions
Symbol Parameter Min Typ Max Unit Conditions
VDD
DC supply
voltage
4.5 5.0 5.5 V
VI
DC input
voltage
0 5.0 VDD V
VO
DC output
voltage
0 5.0 VDD V
TA
Temperature
range
-40
+85 C
Ind
TR
Input rise time
15
ns
10%-90%
CMOS
TF
Input fall time
15
ns
10%-90%
CMOS
DC Characteristics
Symbol Parameter Min Max Unit
IIH
Input leakage,
no pullup
-1.0
+1.0
uA
IIL
Input leakage,
no pullup
-1.0
+1.0
uA
High-
impedance
IOZ
output current -1.0 +1.0 uA
bi-directional
pins
VIL
Low level input
voltage
30%
VDD
V
VIH
High level input 70%
voltage
VDD
V
VOL
Low level
output voltage
0.5 V
VOH
High level
VDD-
output voltage 0.5
V
CIN
Input
capacitance
7
pF
Conditions
VIN = VDD =
5.5V
VIN = 0
VDD=5.5V
VDD=5.5V
CMOS inputs
and bi-dir
CMOS inputs
and bi-dir
IOL=5.0mA
IOH=5.0mA
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