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參數(shù)資料
| 型號： | ADS-238Q |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 12-Bit, 20MHz, Low Power Sampling A/D Converters |
| 中文描述： | 12位，20MHz的，低功耗采樣A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 83K |
| 代理商： | ADS-238Q |
Figure 1. ADS-238Q Functional Block Diagram
FEATURES
20MHz sampling rate
Low Power, 100mW, max
100MHz full power input bandwidth
Integral sample-and-hold
Single +3V supply operation
TTL compatible digital output
Offset binary output coding
GENERAL DESCRIPTION
The ADS-238Q is a monolithic, 12-bit, 20MHz, sampling
analog-to-digital converter fabricated in a CMOS process.
The converter is designed for applications where high speed,
wide bandwidth and low power dissipation are essential.
These characteristics are provided through the use of a fully
differential pipeline A/D architecture with digital error
correction logic for the eleven most significant bits.
The ADS-238Q offers excellent dynamic performance while
consuming only 79mW, typical. The power dissipation is
approximately proportional to the sampling rate, thus the
ADS-238Q is ideal for low power applications between 1 and
20 MHz. With low distortion and high dynamic range, this
device provides the performance required for imaging,
telecommunications, multimedia, and instrumentation
applications.
The ADS-238Q is available in a 44-pin (plastic) TQFP
package and operates over the commercial 0°C to 70°C
temperature range.
INPUT/OUTPUT CONNECTIONS
PIN
FUNCTION
PIN
FUNCTION
1
2
3
4
5
6
7
8
9
GND
CLK
N.C.
V
S
V
S
V
S
V
S
V
S
V
S
V
REF–
V
REF+
N.C.
N.C.
N.C.
GND
BIAS1
BIAS2
V
CM
GND
V
IN+
V
IN–
GND
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
V
S
BIT 12 (LSB)
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
GND
GND
GND
GND
GND
GND
GND
GND
GND
10
11
12
13
14
15
16
17
18
19
20
21
22
ADS-238Q
12-Bit, 20MHz, Low Power
Sampling A/D Converters
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048 (U.S.A.) Tel: (508)339-3000 Fax: (508)339-6356
For immediate assistance: (800) 233-2765
Note:
Recommend that N.C. (no connect) pins be connected to analog ground.
X2
+
–
+
–
2 CLK
X2
S/H
Bias
Current
Adjust
2-Bit
Flash A/D
2-Bit
Flash A/D
2-Bit
Flash A/D
Stage 10
4 to 9, 44
+V
S
1, 15, 19, 22 to 31
GND
Stage 1
Reference
Input
Common Mode
Voltage Reference
V
REF+
BIAS2
BIAS1
V
REF–
V
IN+
V
IN–
V
CM
11
16
17
10
20
21
18
Clock
2-Bit
DAC
2-Bit
DAC
Digital Delay
and Error
Correction
32
33
34
35
36
37
38
39
40
41
42
43
Bit 1 (MSB)
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12 (LSB)
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