14-Bit, 10MHz
Sampling A/D Converters
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
• Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
Figure 1. ADS-945 Functional Block Diagram
FEATURES
• 14-bit resolution
• 10MHz minimum throughput
• Functionally complete
• No missing codes
• Low power, 4.0W
• Excellent dynamic performance
• Internally clamped input
• Edge triggered
• TTL compatible
• 2" x 4" module
• Very low profile
GENERAL DESCRIPTION
The low-cost ADS-945 is a high-performance, 14-bit, 10MHz
sampling A/D converter. This device accurately samples
full-scale input signals up to Nyquist frequencies with no
missing codes. The dynamic performance of the ADS-945
has been optimized to achieve a THD of –80dB and a
SNR of 75dB.
Packaged in a 2" x 4" module, the functionally complete
ADS-945 contains a fast-settling sample/hold amplifier, a
subranging (two-pass) A/D converter, a precise voltage
reference, timing/control logic, three-state outputs, and
error-correction circuitry. Digital inputs and outputs are TTL
compatible (except for pins 29 and 30 which are ECL).
Requiring ±15V, +5V and –5.2V supplies, the ADS-945 typically
dissipates 4.0W. The unit is offered with a bipolar input range
of ±1.25V. Models are available for use in either commercial
(0 to +70°C) or military (–55 to +125°C) operating temperature
ranges. Typical applications include radar signal analysis,
medical/graphic imaging, and FFT spectrum analysis.
1
ANALOG GROUND
70-76
ANALOG GROUND
4
ANALOG INPUT
69
+5V ANALOG SUPPLY
5-6
ANALOG GROUND
64-68
ANALOG GROUND
7
+10V REFERENCE OUT
63
–5.2V ANALOG SUPPLY
8
ANALOG GROUND
62
ANALOG GROUND
9
GAIN ADJUST
61
NO CONNECT
10-11
DO NOT CONNECT
58-60
DIGITAL GROUND
12
–15V SUPPLY
57
–5.2V DIGITAL SUPPLY
13
ANALOG GROUND
56
DO NOT CONNECT
14
+15V SUPPLY
55
+5V DIGITAL SUPPLY
15-17
ANALOG GROUND
54
DIGITAL GROUND
18
OFFSET ADJUST
53
BIT 1 (MSB)
19-25
ANALOG GROUND
52
BIT 2
26
MISSING PIN
51
BIT 3
27
DIGITAL GROUND
50
BIT 4
28
DIGITAL GROUND
49
BIT 5
29
T/H STATUS
48
BIT 6
30
T/H STATUS
47
BIT 7
31
DIGITAL GROUND
46
BIT 8
32
START CONVERT
45
BIT 9
33
OVERFLOW
44
BIT 10
34
OUTPUT ENABLE (OE)
43
BIT 11
35
DIGITAL GROUND
42
BIT 12
36
NO CONNECT
41
BIT 13
37
DIGITAL GROUND
40
BIT 14 (LSB)
38
DIGITAL GROUND
39
DIGITAL GROUND
INPUT/OUTPUT CONNECTIONS
PIN
FUNCTION
PIN
FUNCTION
®®
ADS-945
REF
DAC
53
52
51
50
49
48
47
46
45
44
43
42
41
40
TIMING AND
CONTROL LOGIC
ANALOG INPUT 4
START CONVERT 32
T/H STATUS 29
+1
BUFFER
FLASH
ADC
1
FLASH
ADC
2
Σ
AMP
GAIN
CIRCUIT
GAIN ADJUST 9
OFFSET
CIRCUIT
OFFSET ADJUST 18
14
+15V
SUPPLY
12
–15V
SUPPLY
55
+5V DIGITAL
SUPPLY
34 OUTPUT ENABLE
T/H
+10 REF. OUT 7
T/H STATUS 30
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
BIT 13
BIT 14 (LSB)
33 OVERFLOW
1,2,3,5,6,8,13,15,17,
19-25,62,64-68,70-76
ANALOG GROUND
27,28,31,35,37-39,54,58-60
DIGITAL
GROUND
36, 61
NO
CONNECT
57
–5.2V DIGITAL
SUPPLY
26 MISSING PIN
10,11,56 DO NOT CONNECT
CASE
DGND
AGND
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