ADS-238Q Datel, Inc., ADS-238Q Datasheet
ADS-238Q
Manufacturer Part Number
ADS-238Q
Description
12-bit, 20mhz, Low Power Sampling A/D Converters
Manufacturer
Datel, Inc.
Datasheet
1.ADS-238Q.pdf
(7 pages)
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
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.
®
BIAS1
BIAS2
V
V
V
V
V
REF+
REF–
IN+
IN–
CM
16
17
11
10
20
21
18
Voltage Reference
Reference
Bias
Current
Adjust
Common Mode
Input
S/H
X2
X2
å
å
+
+
®
–
–
Figure 1. ADS-238Q Functional Block Diagram
4 to 9, 44
+V
Flash A/D
Flash A/D
Flash A/D
S
2-Bit
2-Bit
2-Bit
Stage 10
Stage 1
1, 15, 19, 22 to 31
Note: Recommend that N.C. (no connect) pins be connected to analog ground.
PIN
10
12
13
14
15
16
17
18
19
20
21
22
GND
11
1
2
3
4
5
6
7
8
9
2-Bit
DAC
2-Bit
DAC
FUNCTION
GND
CLK
N.C.
V
V
V
V
V
V
V
V
N.C.
N.C.
N.C.
GND
BIAS1
BIAS2
V
GND
V
V
GND
S
S
S
S
S
S
REF–
REF+
CM
IN+
IN–
INPUT/OUTPUT CONNECTIONS
12-Bit, 20MHz, Low Power
Sampling A/D Converters
Digital Delay
Correction
and Error
Clock
PIN
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
ADS-238Q
FUNCTION
V
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
S
32
33
34
35
36
37
38
39
40
41
42
43
2 CLK
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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