ADS-235 Datel, Inc., ADS-235 Datasheet
ADS-235
Manufacturer Part Number
ADS-235
Description
Sampling A/D Converters
Manufacturer
Datel, Inc.
Datasheet
1.ADS-235.pdf
(8 pages)
FEATURES
· 5MHz (ADS-235/236) and 9MHz (ADS-237) sampling rates
· Low power
· Outstanding dynamic performance
· Fully differential or single-ended analog input
· 100MHz full power input bandwidth
· Integral sample-and-hold
· Single +5V supply operation
· Internally generated DC bias Voltage
· 3.0/5.0V CMOS compatible digital output
· TTL/CMOS compatible digital inputs/outputs
GENERAL DESCRIPTION
The ADS-235, ADS-236 and ADS-237 are monolithic, 12-bit,
sampling analog-to-digital converters fabricated in a CMOS
process. The converters are 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 sampling pipeline A/D architecture with
digital error correction logic.
The ADS-235, ADS-236 and ADS-237 offer excellent dynamic
performance while consuming only 300mW. The digital output
circuit is separate and can be powered from either a 3V or 5V
supply allowing the user to interface with 3V logic, if desired.
The ADS-235, ADS-236 and ADS-237 provide the user with
an internally generated DC bias voltage output. This DC bias
voltage is ideal for AC coupled analog input applications.
The units are available in a 28-lead plastic SOIC package
and operate over the 0°C to 70°C and –40 to +85°C
temperature ranges.
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
®
V
V
ROUT
V
V
V
RIN
IN +
IN –
DC
11
12
10
8
9
+DV
2, 4
S
1
Reference
DC Bias Output
2.3 Volt
DGND 1
3, 5
Figure 1. ADS-235, ADS-236 and ADS-237 Functional Block Diagram
S/H
6, 14
+AV
X8
X8
+
+
S
®
–
–
AGND
7, 13
+DV
22
S
Flash A/D
Flash A/D
Flash A/D
2
ADS-235, ADS-236, ADS-237
4-Bit
4-Bit
Clock
4-Bit
DGND 2
21
Stage 4
Stage 3
Stage 1
PIN FUNCTION
10
11
12
13
14
1
2
3
4
5
6
7
8
9
CLK, CLOCK
+DV
DGND1
+DV
DGND1
+AV
AGND
V
V
V
V
V
AGND
+AV
4-Bit
DAC
DAC
4-Bit
IN
IN
DC
ROUT
RIN
+, ANALOG INPUT
–, ANALOG INPUT
, DC BIAS OUTPUT
S
S
S
S
, REF. IN
, +5V ANALOG SUP. 23
, +5V ANALOG SUP. 15
1, +5V DIG. SUP.
1, +5V DIG. SUP.
, REF. OUT
INPUT/OUTPUT CONNECTIONS
Sampling A/D Converters
12-Bit, 5MHz and 9MHz
Digital Delay
Correction
Error
and
PIN FUNCTION
28
27
26
25
24
22
21
20
19
18
17
16
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
+DV
DGND2
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
S
2, DIG. OUTPUT SUP.
15 Bit 1 (MSB)
16 Bit 2
17 Bit 3
18 Bit 4
19 Bit 5
20 Bit 6
23 Bit 7
24 Bit 8
25 Bit 9
26 Bit 10
27 Bit 11
28 Bit 12 (LSB)
1 CLK
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