ADS-947GE MURATA-PS [Murata Power Solutions Inc.], ADS-947GE Datasheet

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ADS-947GE

Manufacturer Part Number
ADS-947GE
Description
14-Bit, 10MHz Sampling A/D Converters
Manufacturer
MURATA-PS [Murata Power Solutions Inc.]
Datasheet
PRELIMINARY PRODUCT DATA
FEATURES
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)
DATEL, Inc., Mansfield, MA 02048 (USA)
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
+5V ANALOG SUPPLY
+5V DIGITAL SUPPLY
–5.2V SUPPLY
ANALOG GROUND
DIGITAL GROUND
POWER AND GROUNDING
®
START CONVERT 18
OFFSET ADJUST 23
ANALOG INPUT 21
DATA VALID 17
19, 24
22
13
20
14
Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356
CONTROL LOGIC
+
S/H
TIMING AND
®
Figure 1. ADS-947 Functional Block Diagram
AMP
BUFFER
REF
FLASH
FLASH
ADC
DAC
ADC
1
2
operating temperature ranges. A proprietary, auto-calibrating,
error-correcting circuit allows the device to achieve specified
performance over the extended temperature range.
PIN
10
11
12
1
2
3
4
5
6
7
8
9
FUNCTION
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
INPUT/OUTPUT CONNECTIONS
Sampling A/D Converters
Email: sales@datel.com
PIN
24
23
22
21
20
19
18
17
16
15
14
13
14-Bit, 10MHz
ADS-947
FUNCTION
ANALOG GROUND
OFFSET ADJUST
+5V ANALOG SUPPLY
ANALOG INPUT
–5.2V SUPPLY
ANALOG GROUND
START CONVERT
DATA VALID
BIT 14 (LSB)
BIT 13
DIGITAL GROUND
+5V DIGITAL SUPPLY
Internet: www.datel.com
16 BIT 14 (LSB)
15 BIT 13
12 BIT 12
11 BIT 11
10 BIT 10
9
8
7
6
5
4
3
2
1
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)

Related parts for ADS-947GE

ADS-947GE Summary of contents

Page 1

... 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 ± ...

Page 2

... Slew Rate — Aperture Delay Time — Aperture Uncertainty — PHYSICAL/ENVIRONMENTAL UNITS PARAMETERS Volts Operating Temp. Range, Case ADS-947MC, GC Volts ADS-947ME, GE, QL +0.3 Volts DD Thermal Impedance Volts jc °C ca Storage Temperature Range Package Type Weight unless otherwise specified.) +25° +70°C TYP. ...

Page 3

... Bypass all power supplies to ground with 4.7µF tantalum capacitors in parallel with 0.1µF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. 2. The ADS-947 achieves its specified accuracies without the need for external calibration. If required, the device’s small initial offset and gain errors can be reduced to zero using the adjustment circuitry shown in Figures 2 and 3 ...

Page 4

... To avoid interaction, offset must be adjusted before gain. The ranges of adjustment for the circuits in Figures 2 and 3 are guaranteed to compensate for the ADS-947’s initial accuracy errors and may not be able to compensate for additional system errors. A/D converters are calibrated by positioning their digital outputs exactly on the transition point between two adjacent digital output codes. This can be accomplished by connecting LED’ ...

Page 5

... For sampling rates less than 10MHz, the start pulse can be wider than 85nsec, however a minimum pulse width low of 15nsec should be maintained. A 10MHz clock with a 20nsec positive pulse width is used for all production testing. Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered ...

Page 6

... ADS-947 Figure 6. ADS-947 Histogram and Differential Nonlinearity Figure 5. FFT Analysis of ADS-947 (fs = 8MHz, fin = 3.85MHz, Vin = –0.5dB, 16,384 point FFT) 6 ® ® ...

Page 7

... ADS-947 ...

Page 8

... ADS-947ME –40 to +100°C ADS-947ME-QL –40 to +100°C ADS-947GC 0 to +70°C ADS-947GE –40 to +100°C Receptacles for PC board mounting can be ordered through AMP, Inc., Part # 3-331272-8 (Component Lead Socket), 24 required. ® ® DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www ...

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