ADS-943GM データシートの表示（PDF） - Unspecified
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ADS-943GM Datasheet PDF : 8 Pages
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ADS-943
14-Bit, 3MHz, Low-Distortion
Sampling A/D Converters
FEATURES
• 14-bit resolution
• 3MHz minimum sampling rate
• Ideal for both frequency and time-domain applications
• Excellent peak harmonics, –83dB
• Excellent signal-to-noise ratio, 79dB
• No missing codes over full military temperature range
• ±5V supplies, 1.7 Watts
• Small, 24-pin ceramic DDIP or SMT
• Low cost
GENERAL DESCRIPTION
The low-cost ADS-943 is a 14-bit, 3MHz sampling A/D
converter optimized to meet the demanding dynamic-range
and sampling-rate requirements of contemporary digital
telecommunications applications. The ADS-943's outstanding
dynamic performance is evidenced by a peak harmonic
specification of –83dB and a signal-to-noise ratio (SNR) of
79dB. Additionally, the ADS-943 easily achieves the 2.2MHz
minimum sampling rate required by digital receivers in certain
ADSL, HDSL and ATM applications. The ADS-943 also
addresses size and power constraints normally associated with
these types of applications. This device requires just ±5V
supplies, dissipates 1.7 Watts, and is packaged in a very small
24-pin DDIP.
Although optimized for frequency-domain applications, the
ADS-943's DNL and noise specifications are also outstanding,
thereby making it an equally impressive device for time-domain
applications (graphic and medical imaging, process control,
etc.). In fact, the ADS-943 guarantees no missing codes to the
14-bit level over the full military operating temperature range.
The functionally complete ADS-943 contains a fast-settling
sample-hold amplifier, a subranging (two-pass) A/D converter,
an internal reference, timing/control logic, and error-correction
circuitry. Digital input and output levels are TTL. The unit is
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1
BIT1 (MSB)
2
BIT 2
3
BIT 3
4
BIT 4
5
BIT 5
6
BIT 6
7
BIT 7
8
BIT 8
9
BIT 9
10 BIT 10
11 BIT 11
12 BIT 12
24 ANALOG GROUND
23 OFFSET ADJUST
22 +5V ANALOG SUPPLY
21 ANALOG INPUT
20 –5V SUPPLY
19 ANALOG GROUND
18 START CONVERT
17 EOC
16 BIT 14 (LSB)
15 BIT 13
14 DIGITAL GROUND
13 +5V DIGITAL SUPPLY
edge-triggered, requiring only the rising edge of a start convert
pulse to initiate a conversion.
The device is offered with a bipolar input range of ±2V. Models
are available for use in either commercial (0 to +70°C) or
military (–55 to +125°C) operating temperature ranges. A
proprietary, auto-calibrating, error-correcting circuit allows the
device to achieve specified performance over the full military
temperature range.
OFFSET ADJUST 23
ANALOG INPUT 21
POWER AND GROUNDING
+5V ANALOG SUPPLY 22
+5V DIGITAL SUPPLY 13
DIGITAL GROUND
14
–5V SUPPLY
20
ANALOG GROUND 19, 24
START CONVERT 18
EOC 17
–
S/H
+
BUFFER
FLASH
ADC
1
REF
DAC
Σ
AMP
FLASH
ADC
2
TIMING AND
CONTROL LOGIC
Figure 1. ADS-943 Functional Block Diagram
16 BIT 14 (LSB)
15 BIT 13
12 BIT 12
11 BIT 11
10 BIT 10
9 BIT 9
8 BIT 8
7 BIT 7
6 BIT 6
5 BIT 5
4 BIT 4
3 BIT 3
2 BIT 2
1 BIT 1 (MSB)
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
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