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ADS-325A

更新时间： 2024-09-15 03:17:55
品牌 Logo 应用领域
CANDD 转换器
页数 文件大小 规格书
8页 145K
描述
10-Bit, 20MHz Sampling A/D Converter

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中文翻译

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ADS-325A 数据手册

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®
®
ADS -3 2 5 A  
10-Bit, 20MHz  
INN OVATION and E XCELLENCE  
Sampling A/D Converter  
FEATURES  
• 10-bit, 20MHz sampling  
• ±1LSB max. differential nonlinearity  
• Internal calibration circuit  
• Internal S/H amplifier  
• 70MHz input bandwidth  
• TTL/CMOS compatible in-out logic  
• Latched three-state output data  
• Single +5V supply  
• Low 150mW power dissipation  
• Small 48 pin LQFP package  
• Low cost  
INPUT/OUTPUT CONNECTIONS  
PIN FUNCTION  
PIN FUNCTION  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
DIGITAL GROUND (DGND)  
1
BIT 10 (LSB)  
NO CONNECTION  
2
BIT 9  
NO CONNECTION  
3
BIT 8  
GENERAL DESCRIPTION  
+DVS (Digital)  
4
BIT 7  
ANALOG GROUND (AGND)  
ANALOG GROUND (AGND)  
TEST SIGNAL IN  
5
BIT 6  
DATEL's ADS-325A is a low power, 10-bit, 20MHz, CMOS  
sampling A/D converter. Its small 48 pin plastic LQFP package  
contains a S/H amplifier, a 3-state output register, linearity  
calibration circuitry, and all necessary control logic. Only two  
external reference voltages, an A/D clock and a few digital  
inputs are required. The A/D clock may be applied with 50%  
duty cycle.  
The excellent dynamic performance includes a spurious free  
dynamic range of 65dB and a signal-to-noise ratio with  
distortion of 54dB with a 3MHz input. ADS-325A is capable of  
operating from a single +5V power supply and typically  
consumes only 150mW. It can also operate from a +5V analog  
VS with +3.3V digital VS enabling an interface with 3.3V logic  
circuitry. The ADS-325A is ideally suited for high quality video/  
CCD imaging applications.  
6
DIGITAL GROUND (DGND)  
+DVS (Digital)  
BIT 5  
7
CALIBRATION (CAL)  
NO CONNECTION  
8
9
BIT 4  
ANALOG INPUT (VIN)  
TEST SIGNAL OUT  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
BIT 3  
BIT 2  
TEST SIGNAL IN  
BIT 1 (MSB)  
TEST PIN  
ANALOG GROUND (AGND)  
REFERENCE BOTTOM (VRB)  
REFERENCE BOTTOM (VRB)  
NO CONNECTION  
TEST SIGNAL IN  
RESET  
DIGITAL GROUND (DGND)  
SELECT (SEL)  
NO CONNECTION  
NO CONNECTION  
+AV (Analog)  
S
TEST MODE  
REFERENCE TOP (VRT)  
REFERENCE TOP (VRT)  
ANALOG GROUND (AGND)  
ANALOG GROUND (AGND)  
LINV  
MINV  
A/D CLOCK  
+AV (Analog)  
S
+AV (Analog)  
S
OUTPUT ENABLE (OE)  
CHIP ENABLE (CE)  
44  
43  
27  
28  
36  
18  
25  
26  
AGND  
+AVS  
SENSE  
AMP  
#1  
12 BIT 1 (MSB)  
11 BIT 2  
10 BIT 3  
COARSE  
CORRECTION  
AND  
LATCH  
9
8
BIT 4  
BIT 5  
VIN 39  
S/H AMP  
+
x8  
VRT  
29  
VRT 30  
5
4
3
BIT 6  
BIT 7  
BIT 8  
DAC  
FINE  
COARSE  
COMPARISON  
AND  
FINE  
COMPARISON  
AND  
LATCH  
ENCODE  
ENCODE  
2
1
BIT 9  
CALIBRATION  
UNIT  
BIT 10 (LSB)  
VRB  
34  
21 MINV  
SENSE  
V
RB 35  
AMP  
#2  
20 LINV  
19 TEST MODE  
A/D CLOCK 22  
CE  
TIMING GEN.  
41 CAL  
AUTOCALIBRATION  
PULSE  
17 SEL  
24  
GENERATOR  
15 RESET  
OE 23  
Figure 1. ADS-325A Functional Block Diagram  
Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356  
DATEL, Inc., Mansfield, MA 02048 (USA)  
•
•
Email: sales@datel.com • Internet: www.datel.com  
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