ADS-947ME-QL 查看數據表（PDF） - Murata Power Solutions
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ADS-947ME-QL Datasheet PDF : 8 Pages
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PRELIMINARY PRODUCT DATA
ADS-947
14-Bit, 10MHz
Sampling A/D Converters
FEATURES
• 14-bit resolution
• 10MHz minimum sampling rate
• No missing codes
• Ideal for both time and frequency-domain applications
• Excellent THD (–81dB) and SNR (76dB)
• Edge-triggered
• Small, 24-pin, ceramic DDIP or SMT
• Requires only +5V and –5.2V supplies
• Low-power, 2 Watts
GENERAL DESCRIPTION
The ADS-947 is a 14-bit, 10MHz sampling A/D converter.
This device accurately samples full-scale input signals up to
Nyquist frequencies with no missing codes. Excellent
differential nonlinearity error (DNL), signal-to-noise ratio
(SNR), and total harmonic distortion (THD) make the ADS-
947 the ideal choice for both time-domain (CCD/FPA
imaging, scanners, process control) and frequency-domain
(radar, telecommunications, spectrum analysis) applications.
The functionally complete ADS-947 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 ADS-947
only requires the rising edge of a start convert pulse to
operate.
Requiring only +5V and –5.2V supplies, the ADS-947 typically
dissipates just 2 Watts. The device is offered with a bipolar
input range of ±2V. Models are available for use in either
commercial (0 to +70°C) or extended (–40 to +100°C)
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1
BIT 1 (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 –5.2V SUPPLY
19 ANALOG GROUND
18 START CONVERT
17 DATA VALID
16 BIT 14 (LSB)
15 BIT 13
14 DIGITAL GROUND
13 +5V DIGITAL SUPPLY
operating temperature ranges. A proprietary, auto-calibrating,
error-correcting circuit allows the device to achieve specified
performance over the extended temperature range.
OFFSET ADJUST 23
ANALOG INPUT 21
POWER AND GROUNDING
+5V ANALOG SUPPLY 22
+5V DIGITAL SUPPLY 13
–5.2V SUPPLY
20
ANALOG GROUND 19, 24
DIGITAL GROUND
14
START CONVERT 18
DATA VALID 17
–
S/H
+
S
BUFFER
FLASH
ADC
1
REF
DAC
AMP
FLASH
ADC
2
TIMING AND
CONTROL LOGIC
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)
Figure 1. ADS-947 Functional Block Diagram
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
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