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參數(shù)資料
| 型號： | SPT7820 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | EVALUATION BOARD |
| 中文描述： | 評價委員會 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 206K |
| 代理商： | SPT7820 |
8
5/22/97
AN7820/24
Figure 11: Recommended Interfacing Circuit
-5.2V
.01
μ
F
.01
μ
F
.01
μ
F
IC1
(REF-03)
6
5
2
4
+5V
+
Vout
Trim
GND
Vin
1
μ
F
.01
F
+
-
10K
1
3
2
4
8
7
6
10K
30K
30K
1
μ
F
+
+5V
.01
μ
F
.01
μ
F
1
μ
F
+
.01
μ
F
IC2
O
CLK
VIN
(
±
2V)
+2.5V
-2.5V
CLK
VIN
VFT
VST
VRM
VSB
VFB
15
21
19
20
22
23
24
(ORB)
(MSB)
V
V
D
V
V
D
A
D
D
A
.1
μ
F
C10
.1
μ
F
C9
10
μ
F
10
μ
F
+
D1
.01
μ
F
+
+5V
(Analog)
AGND
DGND
-5.2V
F
F
16
27
17
26
18
25
14
28
1
13
.1
μ
F
C11
.1
μ
F
.01
μ
F
D
FB3
+5V
LOGIC
FAST TTL
BUFFER
LIMITER
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
12
11
10
9
8
7
6
5
4
3
2
(LSB)
V
V
S
C1
C2
C3
C4
C5
C8
C6
C7
R1=100
5) Bypass all reference and power supply pinsas closely to
the device pin as possible (chip caps C1-11 are preferred):
0.1
μ
F for VCC and VEE, and 0.01
μ
F for DVCC and Vref.
6 The top reference (VFT) driver must be current limited to
20 mA maximum if a different reference driver circuit is
used in place of the recommended circuit shown in fig-
ure 11.
7) The limiter is required if the maximum peak-to-peak volt-
age of the analog input exceeds
±
2.5 V. Incorporate the
limiter within the analog input driver or use the circuit
shown in figure 12. Another option is to add a 100
resistor in series to current limited the input. This last
option adds another LSB error to both
±
full scale com-
pared to only 1/2 LSB when using the circuit shown in
figure 12.
Figure 12 : An Example of an Input Limiter
-
+
LIMITER
SK1,2 = Fast recovery Schottkey diode:
RCA, P/N SK9091 or equivalent
47
To ADC
VIN
-5.2 V
VIN
+5 V
SK1
SK2
10 k
10 k
+
-
-
+
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相關代理商/技術參數(shù) |
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| SPT7820ACN | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:10-BIT, 20 MSPS, TTL OUTPUT, A/D CONVERTER |
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| SPT7820AIJ | 制造商:SIGNAL 功能描述: |
| SPT7820AMJ | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:10-BIT, 20 MSPS, TTL OUTPUT, A/D CONVERTER |
| SPT7820BCN | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:10-BIT, 20 MSPS, TTL OUTPUT, A/D CONVERTER |
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