®
®
ADS-CCD1202
N
START
CONVERT
200ns typ.
N+1
10ns typ.
INTERNAL S/H
310ns typ.
Hold
Acquisition Time
190ns typ.
70ns ±10ns
30ns typ.
EOC
Conversion Time
360ns ±20ns
35ns max.
75ns max.
OUTPUT DATA
DATA (N-1) VALID
425ns min.
INVALID
DATA
DATA N VALID
Note: Scale is approximately 25ns per division.
Figure 4. ADS-CCD1202 Timing Diagram
TIMING
The ADSCCD-1202 is an edge triggered device. A conversion
is initiated by the rising edge of the start convert pulse and no
additional external timing signals are required. The device does
not employ "pipeline" delays to increase its throughput rate. It
does not require multiple start convert pulses to bring valid
digital data to its output pins.
+15V
R3
200K 5%
C1
0.1MF
C2
15pF COG
R5
2K .1%
12
13
+15V
U4
74LS86
2
4
6
6
AD845
4
C6
2.2MF
-15V
R8
10K
0.1%
13
14
3
+
16
C23
0.1MF
17
18
19
C10
0.1MF
-15V
+15V
C11
2.2MF
C9
2.2MF
20
21
15
ADS-CCD1201/1202
+5V
DGND
EOC
ST. CONV
B2
B1
AGND
INPUT
U1
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
3
2
1
12
11
10
9
8
7
6
5
4
U3
74LS240
2
4
6
8
11
13
15
17
19
1A1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
2G
C7
0.1MF
C8
2.2MF
+5V
8
11
13
C21
0.1MF
R7
10K 0.1%
C5
0.1MF
11
+5V
U2
74LS240
R4
1.98K
0.1%
R6
2K 0.1%
3
+
C4
2.2MF
2
7
–
U5
20
1Y1
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
1G
10
+5V
C17
0.1MF
P2
18
16
14
12
9
7
5
3
1
B1
B2
B3
B4
B5
B6
B7
SG3
C16
0.1MF
SG2
32
30
33
31
OFFSET
ADJ
R2
20K
-15V
+
P4
ANALOG
INPUT
R1
50
C3
0.1MF
1A1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
2G
28 MSB 29
26
24
22
20
27
25
23
21
19
GAIN
ADJ
+
J5
+15V
15
17
19
C19
2.2MF
+
C20
0.1MF
7
6
OP-77
4
U6
–
2
P1
+5V
2
4
6
8
10
1
3
5
7
9
C22
2.2
-15V MF
+
20
1Y1
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
1G
10
18
16
14
12
9
7
5
3
1
B8
B9
B10
B11
B12
B13
B14
18
16
14
12
10
8
6
17
15
13
11
9
7
LSB 5
+
+
12 11
14 13
16 15
18 17
20 19
22 21
24 23
25
26
START
CONVERT
+15V
C12
0.1MF
-15V
C13
0.1MF
+5V
C15
0.1MF
C14
2.2MF
+10VREF
22 +15V
23
AGND
24 -15V
+
4 EOC 3
2
ST.CONV.
1
+
34 ENABLE
4
5
U4
74LS86
6
J3
9
10
U4
74LS86
NOTES:
1. FOR ADS-BCCD1201 Y1 IS 1.2MHZ
FOR ADS-BCCD1201 Y1 IS 2MHZ
8
J4
P3
J1
J2
14
1
2
C24
U4
7
3
74LS86
SG1
1
SEE NOTE 1
7
Y1
14
XTAL
8
+5V
+
2.2MF
C18
0.1MF
Figure 5.
ADS-CCD1202 Evaluation Board Schematic
5.
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
