ADS-325A Datel, Inc., ADS-325A Datasheet
ADS-325A
Manufacturer Part Number
ADS-325A
Description
10-Bit,20MHz, Sampling A/D Converter
Manufacturer
Datel, Inc.
Datasheet
1.ADS-325A.pdf
(8 pages)
DATEL, Inc., Mansfield, MA 02048 (USA)
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
GENERAL DESCRIPTION
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
V
circuitry. The ADS-325A is ideally suited for high quality video/
CCD imaging applications.
S
with +3.3V digital V
®
IN N O VA T IO N a n d E X C E L L E N C E
A/D CLOCK
S
AGND
+AV
enabling an interface with 3.3V logic
S
V
V
V
V
V
RB
RB
CE
OE
RT
RT
IN
44
43
27
28
36
18
25
26
35
22
24
23
39
29
30
34
COMPARISON
S/H AMP
COARSE
ENCODE
SENSE
AMP
TIMING GEN.
Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356
AND
#1
®
Figure 1. ADS-325A Functional Block Diagram
DAC
+
CALIBRATION
UNIT
x8
COMPARISON
ENCODE
FINE
AND
PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
AUTOCALIBRATION
GENERATOR
SENSE
AMP
FUNCTION
BIT 10 (LSB)
BIT 9
BIT 8
BIT 7
BIT 6
DIGITAL GROUND (DGND)
+DV
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
TEST PIN
TEST SIGNAL IN
RESET
DIGITAL GROUND (DGND)
SELECT (SEL)
+AV S (Analog)
TEST MODE
LINV
MINV
A/D CLOCK
OUTPUT ENABLE (OE)
CHIP ENABLE (CE)
#2
PULSE
S
INPUT/OUTPUT CONNECTIONS
(Digital)
Sampling A/D Converter
CORRECTION
COARSE
LATCH
LATCH
FINE
AND
Email: sales@datel.com
PIN
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
5 BIT 6
4 BIT 7
3 BIT 8
2 BIT 9
1 BIT 10 (LSB)
21 MINV
20 LINV
19 TEST MODE
41 CAL
17 SEL
15 RESET
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
ADS-325A
10-Bit, 20MHz
DIGITAL GROUND (DGND)
NO CONNECTION
NO CONNECTION
+DV
ANALOG GROUND (AGND)
ANALOG GROUND (AGND)
TEST SIGNAL IN
CALIBRATION (CAL)
NO CONNECTION
ANALOG INPUT (V
TEST SIGNAL OUT
TEST SIGNAL IN
ANALOG GROUND (AGND)
REFERENCE BOTTOM (
REFERENCE BOTTOM (V
NO CONNECTION
NO CONNECTION
NO CONNECTION
REFERENCE TOP (V
REFERENCE TOP (V
ANALOG GROUND (AGND)
ANALOG GROUND (AGND)
+AV S (Analog)
+AV S (Analog)
FUNCTION
S
(Digital)
Internet: www.datel.com
IN
)
RT
RT
)
)
VRB
RB
)
)
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