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ADS-325A fiches techniques PDF

Datel - Sampling A/D Converter

Numéro de référence ADS-325A
Description Sampling A/D Converter
Fabricant Datel 
Logo Datel 





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ADS-325A fiche technique
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INN O VAT IO N a n d E X C E L L E N C E
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
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.
ADS-325A
10-Bit, 20MHz
Sampling A/D Converter
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
1 BIT 10 (LSB)
2 BIT 9
3 BIT 8
4 BIT 7
5 BIT 6
6 DIGITAL GROUND (DGND)
7 +DVS (Digital)
8 BIT 5
9 BIT 4
10 BIT 3
11 BIT 2
12 BIT 1 (MSB)
13 TEST PIN
14 TEST SIGNAL IN
15 RESET
16 DIGITAL GROUND (DGND)
17 SELECT (SEL)
18 +AVS (Analog)
19 TEST MODE
20 LINV
21 MINV
22 A/D CLOCK
23 OUTPUT ENABLE (OE)
24 CHIP ENABLE (CE)
PIN FUNCTION
48 DIGITAL GROUND (DGND)
47 NO CONNECTION
46 NO CONNECTION
45 +DVS (Digital)
44 ANALOG GROUND (AGND)
43 ANALOG GROUND (AGND)
42 TEST SIGNAL IN
41 CALIBRATION (CAL)
40 NO CONNECTION
39 ANALOG INPUT (VIN)
38 TEST SIGNAL OUT
37 TEST SIGNAL IN
36 ANALOG GROUND (AGND)
35 REFERENCE BOTTOM (VRB)
34 REFERENCE BOTTOM (VRB)
33 NO CONNECTION
32 NO CONNECTION
31 NO CONNECTION
30 REFERENCE TOP (VRT)
29 REFERENCE TOP (VRT)
28 ANALOG GROUND (AGND)
27 ANALOG GROUND (AGND)
26 +AVS (Analog)
25 +AVS (Analog)
AGND
+AVS
44
43
27
28
36
18
25
26
VIN 39
VRT 29
VRT 30
VRB 34
VRB 35
SENSE
AMP
#1
S/H AMP
COARSE
COMPARISON
AND
ENCODE
A/D CLOCK 22
CE 24
OE 23
TIMING GEN.
+ x8
COARSE
CORRECTION
AND
LATCH
DAC
CALIBRATION
UNIT
FINE
COMPARISON
AND
ENCODE
FINE
LATCH
SENSE
AMP
#2
AUTOCALIBRATION
PULSE
GENERATOR
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
Figure 1. ADS-325A Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 Email: [email protected] Internet: www.datel.com

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