adc-305 C&D Technologies., adc-305 Datasheet - Page 5

• Manufacturer Part Number: adc-305
• Description: 8-bit, 20mhz Cmos A/d Converters
• Manufacturer: C&D Technologies.

(R
mA
20
15
10
®
IN
V
= 75 )
IN
Supply Current vs. Sampling Rate
Adjust
Gain
+DVS=+AVS=+5V
VIN = 1kHz
Ta=25°C
100
5
10
–5V(A)
51
470µF
Sampling Rate
120
680
15
Adjust
V
510
390
RB
2k
20
2SC2785
2SC2785
2SC2785
25 30MHz
47µF
2.2k
510
®
22µF
10k
Adjust
–5V(A)
Bias
2k
510
+5V(A)
2SC2785
mA
20
15
10
2.2k
5
Supply Current vs. Sampling Voltage
47µF
Adjust
V
2SC2785
RT
4.0
75
+5V(A)
Supply Voltage
4.5
Figure 5. Typical Connection Diagram
0.1µF
Figure 6. Typical Performance Curves
100µH
0.1µF
5.0
0.1µF
0.1µF
5.5V
0.1µF
0.1µF
0.1µF
0.1µF
13
14
15
16
17
18
19
20
21
22
23
24
5
LSB
0.6
0.4
0.2
ADC-305
Differential Linearity Error vs.
+DVS=+AVS=+5V
FS = 20.48MHz
Ta=25°C
Input Signal Frequency
2
Input Signal Frequency
4
12
11
10
9
8
7
6
5
4
3
2
1
6
0.1µF
8
10MHz
10
1
2
3
4
6
7
1
2
3
4
5
6
7
8
9
74LS574
74HC04
0.1µF
0.1µF
dB
46
42
38
36
SNR + THD vs. Input Signal Frequency
+5V(D)
1
20
19
18
17
16
15
14
13
12
11
14
13
11
9
Input Signal Frequency
75
2
47µF
3
ADC-305
Clock Input
(A/D CLK)
(R
+DVS=+AVS=+5V
FS = 20.48MHz
Ta=25°C
IN
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8 (LSB)
4
= 75 )
5
6
7MHz