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DPS9245 Datasheet

  • DPS9245

  • DPS9245 High-Resolution ADC with PGA 11/00

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DPS9245
High-Resolution ADC
with PGA
Datasheet
The DPS9245 is a versatile, analog front end that combines a high-
resolution 5 megasamples per second (MS/s) 16-bit Analog-to-Digital
Converter (ADC), a built-in reference, and a Programmable Gain
Ampli鏗乪r (PGA) with resistive input impedance in a 44-pin package.
Figure 1
DPS9245 Block Diagram
REFCLK
RESETB
Differential
Analog In
(INP, INM)
Low-Noise PGA
(7 Settings)
OVR_RNG
S/H and
ADC
16
Data
AD[15:0]
OE
GAIN[2:0]
VREF
The chip includes a digitally-calibrated, pipeline ADC that is calibrated
upon assertion of a simple reset signal. The combination of a low-noise,
high-linearity, high-input impedance buffer (with programmable gain),
wideband S/H, on-board voltage references, and simple digital interface
(16-bit parallel output word synchronous with the master sampling clock),
makes the chip extremely easy to use in a wide variety of systems. The
analog inputs should be driven differentially, and can be AC-coupled or
DC-coupled to a source. Typical applications include high-performance
data acquisition systems, automatic test equipment, and wideband digital
communications receivers present in systems such as wireless
basestations. The performance of the device with respect to linearity and
noise should be considered separately, as indicated by the THD and
SNR speci鏗乧ations provided in this document.
November 2000
Copyright 漏 1999, 2000 by LSI Logic Corporation. All rights reserved.
1

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